Ieee projects-2013-2014-title-list-for-me-be-mphil-final-year-students

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S.No. IEEE TITLE ABSTRACT IEEE YEAR
1. T o w a r d
P r i v a c y
P r e s e r v i n g
and Collusion
Resistance in
a L o c a t i o n
P r o o f
U p d a t i n g
S y s t e m
By leveraging virtual machine (VM)
technology which provides performance
and fault isolation, cloud resources can be
provisioned on demand in a fine grained,
multiplexed manner rather than in
monolithic pieces. By integrating volunteer
computing into cloud architectures, we
envision a gigantic self-organizing cloud
(SOC) being formed to reap the huge
potential of untapped commodity
computing power over the Internet. Toward
this new architecture where each
participant may autonomously act as both
resource consumer and provider, we
propose a fully distributed, VM-multiplexing
resource allocation scheme to manage
decentralized resources. Our approach not
only achieves maximized resource
utilization using the proportional share
model (PSM), but also delivers provably
and adaptively optimal execution
efficiency. We also design a novel
multiattribute range query protocol for
locating qualified nodes. Contrary to
existing solutions which often generate
bulky messages per request, our protocol
produces only one lightweight query
message per task on the Content
Addressable Network (CAN). It works
effectively to find for each task its qualified
resources under a randomized policy that
mitigates the contention among requesters.
We show the SOC with our optimized
algorithms can make an improvement by
15-60 percent in system throughput than a
P2P Grid model. Our solution also exhibits
fairly high adaptability in a dynamic node-
churning environment.
2013
2. Scalable and
S e c u r e
Personal health record (PHR) is an
emerging patient-centric model of health
2013
TECHNOLOGY: JAVA
DOMAIN: CLOUD COMPUTING

S h a r i n g o f
P e r s o n a l
H e a l t h
R e c o r d s i n
C l o u d
C o m p u t i n g
U s i n g
A t t r i b u t e -
B a s e d
E n c r y p t i o n
information exchange, which is often
outsourced to be stored at a third party,
such as cloud providers. However, there
have been wide privacy concerns as
personal health information could be
exposed to those third party servers and to
unauthorized parties. To assure the patients'
control over access to their own PHRs, it is a
promising method to encrypt the PHRs
before outsourcing. Yet, issues such as risks
of privacy exposure, scalability in key
management, flexible access, and efficient
user revocation, have remained the most
important challenges toward achieving
fine-grained, cryptographically enforced
data access control. In this paper, we
propose a novel patient-centric framework
and a suite of mechanisms for data access
control to PHRs stored in semitrusted servers.
To achieve fine-grained and scalable data
access control for PHRs, we leverage
attribute-based encryption (ABE)
techniques to encrypt each patient's PHR
file. Different from previous works in secure
data outsourcing, we focus on the multiple
data owner scenario, and divide the users
in the PHR system into multiple security
domains that greatly reduces the key
management complexity for owners and
users. A high degree of patient privacy is
guaranteed simultaneously by exploiting
multiauthority ABE. Our scheme also
enables dynamic modification of access
policies or file attributes, supports efficient
on-demand user/attribute revocation and
break-glass access under emergency
scenarios. Extensive analytical and
experimental results are presented which
show the security, scalability, and efficiency
of our proposed scheme.

3. O n D a t a
S t a g i n g
Algorithms for
Shared Data
Accesses in
C l o u d s
In this paper, we study the strategies for
efficiently achieving data staging and
caching on a set of vantage sites in a
cloud system with a minimum cost. Unlike
the traditional research, we do not intend
to identify the access patterns to facilitate
the future requests. Instead, with such a
kind of information presumably known in
advance, our goal is to efficiently stage the
shared data items to predetermined sites at
advocated time instants to align with the
patterns while minimizing the monetary
costs for caching and transmitting the
requested data items. To this end, we
follow the cost and network models in [1]
and extend the analysis to multiple data
items, each with single or multiple copies.
Our results show that under homogeneous
cost model, when the ratio of transmission
cost and caching cost is low, a single copy
of each data item can efficiently serve all
the user requests. While in multicopy
situation, we also consider the tradeoff
between the transmission cost and caching
cost by controlling the upper bounds of
transmissions and copies. The upper bound
can be given either on per-item basis or on
all-item basis. We present efficient optimal
solutions based on dynamic programming
techniques to all these cases provided that
the upper bound is polynomially bounded
by the number of service requests and the
number of distinct data items. In addition to
the homogeneous cost model, we also
briefly discuss this problem under a
heterogeneous cost model with some
simple yet practical restrictions and present
a 2-approximation algorithm to the general
case. We validate our findings by
implementing a data staging solver,
whereby conducting extensive simulation
studies on the behaviors of the algorithms.
2013

1. A New Algorithm
for Inferring User
S e a r c h G o a l s
with Feedback
S e s s i o n s
For a broad-topic and ambiguous
query, different users may have different
search goals when they submit it to a
search engine. The inference and
analysis of user search goals can be
very useful in improving search engine
relevance and user experience. In this
paper, we propose a novel approach to
infer user search goals by analyzing
search engine query logs. First, we
propose a framework to discover
different user search goals for a query
by clustering the proposed feedback
sessions. Feedback sessions are
constructed from user click-through logs
and can efficiently reflect the
information needs of users. Second, we
propose a novel approach to generate
pseudo-documents to better represent
the feedback sessions for clustering.
Finally, we propose a new criterion
)“Classified Average Precision (CAP)” to
evaluate the performance of inferring
user search goals. Experimental results
are presented using user click-through
logs from a commercial search engine
to validate the effectiveness of our
proposed methods.
2013
2. F a c i l i t a t i n g
Effe ctive Use r
N a v i g a t i o n
through Website
S t r u c t u r e
I m p r o v e m e n t
Designing well-structured websites to
facilitate effective user navigation has
long been a challenge. A primary
reason is that the web developers'
understanding of how a website should
be structured can be considerably
different from that of the users. While
various methods have been proposed
to relink webpages to improve
navigability using user navigation data,
2013
TECHNOLOGY: JAVA
DOMAIN: DATA MINING

the completely reorganized new
structure can be highly unpredictable,
and the cost of disorienting users after
the changes remains unanalyzed. This
paper addresses how to improve a
website without introducing substantial
changes. Specifically, we propose a
mathematical programming model to
improve the user navigation on a
website while minimizing alterations to its
current structure. Results from extensive
tests conducted on a publicly available
real data set indicate that our model
not only significantly improves the user
navigation with very few changes, but
also can be effectively solved. We have
also tested the model on large synthetic
data sets to demonstrate that it scales
up very well. In addition, we define two
evaluation metrics and use them to
assess the performance of the improved
website using the real data set.
Evaluation results confirm that the user
navigation on the improved structure is
indeed greatly enhanced. More
interestingly, we find that heavily
disoriented users are more likely to
benefit from the improved structure than
the less disoriented users.
3. A n n o t a t i n g
Search Results
f r o m W e b
D a t a b a s e s
An increasing number of databases
have become web accessible through
HTML form-based search interfaces. The
data units returned from the underlying
database are usually encoded into the
result pages dynamically for human
browsing. For the encoded data units to
be machine processable, which is
essential for many applications such as
deep web data collection and Internet
comparison shopping, they need to be
extracted out and assigned meaningful
labels. In this paper, we present an
automatic annotation approach that
2013

first aligns the data units on a result
page into different groups such that the
data in the same group have the same
semantic. Then, for each group we
annotate it from different aspects and
aggregate the different annotations to
predict a final annotation label for it. An
annotation wrapper for the search site is
automatically constructed and can be
used to annotate new result pages from
the same web database. Our
experiments indicate that the proposed
approach is highly effective.
4. B u i l d i n g a
S c a l a b l e
Database-Driven
R e v e r s e
D i c t i o n a r y
In this paper, we describe the design
and implementation of a reverse
dictionary. Unlike a traditional forward
dictionary, which maps from words to
their definitions, a reverse dictionary
takes a user input phrase describing the
desired concept, and returns a set of
candidate words that satisfy the input
phrase. This work has significant
application not only for the general
public, particularly those who work
closely with words, but also in the
general field of conceptual search. We
present a set of algorithms and the
results of a set of experiments showing
the retrieval accuracy of our methods
and the runtime response time
performance of our implementation.
Our experimental results show that our
approach can provide significant
improvements in performance scale
without sacrificing the quality of the
result. Our experiments comparing the
quality of our approach to that of
currently available reverse dictionaries
show that of our approach can provide
significantly higher quality over either of
the other currently available
implementations.
2013

5. S u p p o r t i n g
Flexible, Efficient,
a n d U s e r -
I n t e r p r e t a b l e
R e t r i e v a l o f
S i m i l a r T i m e
S e r i e s
Supporting decision making in domains
in which the observed phenomenon
dynamics have to be dealt with, can
greatly benefit of retrieval of past cases,
provided that proper representation
and retrieval techniques are
implemented. In particular, when the
parameters of interest take the form of
time series, dimensionality reduction and
flexible retrieval have to be addresses to
this end. Classical methodological
solutions proposed to cope with these
issues, typically based on mathematical
transforms, are characterized by strong
limitations, such as a difficult
interpretation of retrieval results for end
users, reduced flexibility and
interactivity, or inefficiency. In this paper,
we describe a novel framework, in
which time-series features are
summarized by means of Temporal
Abstractions, and then retrieved
resorting to abstraction similarity. Our
approach grants for interpretability of
the output results, and understandability
of the (user-guided) retrieval process. In
particular, multilevel abstraction
mechanisms and proper indexing
techniques are provided, for flexible
query issuing, and efficient and
interactive query answering.
Experimental results have shown the
efficiency of our approach in a
scalability test, and its superiority with
respect to the use of a classical
mathematical technique in flexibility,
user friendliness, and also quality of
results.
2013

1. D i s c o v e r i n g
T e m p o r a l
Change Patterns
in the Presence
of Taxonomies
Frequent itemset mining is a widely
exploratory technique that focuses on
discovering recurrent correlations
among data. The steadfast evolution of
markets and business environments
prompts the need of data mining
algorithms to discover significant
correlation changes in order to
reactively suit product and service
provision to customer needs. Change
mining, in the context of frequent
itemsets, focuses on detecting and
reporting significant changes in the set
of mined itemsets from one time period
to another. The discovery of frequent
generalized itemsets, i.e., itemsets that
1) frequently occur in the source data,
and 2) provide a high-level abstraction
of the mined knowledge, issues new
challenges in the analysis of itemsets
that become rare, and thus are no
longer extracted, from a certain point.
This paper proposes a novel kind of
dynamic pattern, namely the History
Generalized Pattern (HiGen), that
represents the evolution of an itemset in
consecutive time periods, by reporting
the information about its frequent
generalizations characterized by
minimal redundancy (i.e., minimum level
of abstraction) in case it becomes
infrequent in a certain time period. To
address HiGen mining, it proposes HiGen
Miner, an algorithm that focuses on
avoiding itemset mining followed by
postprocessing by exploiting a support-
driven itemset generalization approach.
To focus the attention on the minimally
redundant frequent generalizations and
thus reduce the amount of the
2013
TECHNOLOGY: DOT NET
DOMAIN: DATA MINING

generated patterns, the discovery of a
smart subset of HiGens, namely the Non-
redundant HiGens, is addressed as well.
Experiments performed on both real and
synthetic datasets show the efficiency
and the effectiveness of the proposed
approach as well as its usefulness in a
real application context.
2. I n f o r m a t i o n -
Theoretic Outlier
D e t e c t ion f o r
L a r g e - S c a l e
C a t e g o r i c a l
D a t a
Outlier detection can usually be
considered as a pre-processing step for
locating, in a data set, those objects
that do not conform to well-defined
notions of expected behavior. It is very
important in data mining for discovering
novel or rare events, anomalies, vicious
actions, exceptional phenomena, etc.
We are investigating outlier detection
for categorical data sets. This problem is
especially challenging because of the
difficulty of defining a meaningful
similarity measure for categorical data.
In this paper, we propose a formal
definition of outliers and an optimization
model of outlier detection, via a new
concept of holoentropy that takes both
entropy and total correlation into
consideration. Based on this model, we
define a function for the outlier factor of
an object which is solely determined by
the object itself and can be updated
efficiently. We propose two practical 1-
parameter outlier detection methods,
named ITB-SS and ITB-SP, which require
no user-defined parameters for deciding
whether an object is an outlier. Users
need only provide the number of outliers
they want to detect. Experimental results
show that ITB-SS and ITB-SP are more
effective and efficient than mainstream
methods and can be used to deal with
both large and high-dimensional data
sets where existing algorithms fail.
2013

3. Robust Module-
B a s e d D a t a
M a n a g e m e n t
The current trend for building an
ontology-based data management
system (DMS) is to capitalize on efforts
made to design a preexisting well-
established DMS (a reference system).
The method amounts to extracting from
the reference DMS a piece of schema
relevant to the new application needs-a
module-, possibly personalizing it with
extra constraints w.r.t. the application
under construction, and then managing
a data set using the resulting schema. In
this paper, we extend the existing
definitions of modules and we introduce
novel properties of robustness that
provide means for checking easily that
a robust module-based DMS evolves
safely w.r.t. both the schema and the
data of the reference DMS. We carry
out our investigations in the setting of
description logics which underlie
modern ontology languages, like RDFS,
OWL, and OWL2 from W3C. Notably, we
focus on the DL-liteA dialect of the DL-
lite family, which encompasses the
foundations of the QL profile of OWL2
(i.e., DL-liteR): the W3C
recommendation for efficiently
managing large data sets.
2013
4. P r o t e c t i n g
Sensitive Labels
in Social Network
D a t a
Anonymization
Privacy is one of the major concerns
when publishing or sharing social
network data for social science
research and business analysis. Recently,
researchers have developed privacy
models similar to k-anonymity to prevent
node reidentification through structure
information. However, even when these
privacy models are enforced, an
attacker may still be able to infer one's
private information if a group of nodes
largely share the same sensitive labels
(i.e., attributes). In other words, the
label-node relationship is not well
2013

protected by pure structure
anonymization methods. Furthermore,
existing approaches, which rely on edge
editing or node clustering, may
significantly alter key graph properties.
In this paper, we define a k-degree-l-
diversity anonymity model that considers
the protection of structural information
as well as sensitive labels of individuals.
We further propose a novel
anonymization methodology based on
adding noise nodes. We develop a new
algorithm by adding noise nodes into
the original graph with the consideration
of introducing the least distortion to
graph properties. Most importantly, we
provide a rigorous analysis of the
theoretical bounds on the number of
noise nodes added and their impacts
on an important graph property. We
conduct extensive experiments to
evaluate the effectiveness of the
proposed technique.
1. C i r c u l a r
R e r a n k in g f o r
V is u a l Se ar c h
Search reranking is regarded as a
common way to boost retrieval
precision. The problem nevertheless is
not trivial especially when there are
multiple features or modalities to be
considered for search, which often
happens in image and video retrieval.
This paper proposes a new reranking
algorithm, named circular reranking,
that reinforces the mutual exchange of
information across multiple modalities for
improving search performance,
following the philosophy that strong
performing modality could learn from
2013
TECHNOLOGY: JAVA
DOMAIN: IMAGE PROCESSING

weaker ones, while weak modality does
benefit from interacting with stronger
ones. Technically, circular reranking
conducts multiple runs of random walks
through exchanging the ranking scores
among different features in a cyclic
manner. Unlike the existing techniques,
the reranking procedure encourages
interaction among modalities to seek a
consensus that are useful for reranking.
In this paper, we study several properties
of circular reranking, including how and
which order of information propagation
should be configured to fully exploit the
potential of modalities for reranking.
Encouraging results are reported for
both image and video retrieval on
Microsoft Research Asia Multimedia
image dataset and TREC Video
Retrieval Evaluation 2007-2008 datasets,
respectively.
2. Efficient Method
f o r C o n t e n t
Reconstruction
W i t h S e l f -
E m b e d d i n g
This paper presents a new model of the
content reconstruction problem in self-
embedding systems, based on an
erasure communication channel. We
explain why such a model is a good fit
for this problem, and how it can be
practically implemented with the use of
digital fountain codes. The proposed
method is based on an alternative
approach to spreading the reference
information over the whole image,
which has recently been shown to be of
critical importance in the application at
hand. Our paper presents a theoretical
analysis of the inherent restoration trade-
offs. We analytically derive formulas for
the reconstruction success bounds, and
validate them experimentally with
Monte Carlo simulations and a
reference image authentication system.
We perform an exhaustive
reconstruction quality assessment,
2013

where the presented reference scheme
is compared to five state-of-the-art
alternatives in a common evaluation
scenario. Our paper leads to important
insights on how self-embedding
schemes should be constructed to
achieve optimal performance. The
reference authentication system
designed according to the presented
principles allows for high-quality
reconstruction, regardless of the amount
of the tampered content. The average
reconstruction quality, measured on
10000 natural images is 37 dB, and is
achievable even when 50% of the
image area becomes tampered.
3. M o d e l i n g
IrisCode and Its
V a r i a n t s a s
C o n v e x
P o l y h e d r a l
Cones and Its
S e c u r i t y
I m p l i c a t i o n s
IrisCode, developed by Daugman, in
1993, is the most influential iris
recognition algorithm. A thorough
understanding of IrisCode is essential,
because over 100 million persons have
been enrolled by this algorithm and
many biometric personal identification
and template protection methods have
been developed based on IrisCode. This
paper indicates that a template
produced by IrisCode or its variants is a
convex polyhedral cone in a
hyperspace. Its central ray, being a
rough representation of the original
biometric signal, can be computed by a
simple algorithm, which can often be
implemented in one Matlab command
line. The central ray is an expected ray
and also an optimal ray of an objective
function on a group of distributions. This
algorithm is derived from geometric
properties of a convex polyhedral cone
but does not rely on any prior
knowledge (e.g., iris images). The
experimental results show that biometric
templates, including iris and palmprint
templates, produced by different
2013

recognition methods can be matched
through the central rays in their convex
polyhedral cones and that templates
protected by a method extended from
IrisCode can be broken into. These
experimental results indicate that,
without a thorough security analysis,
convex polyhedral cone templates
cannot be assumed secure.
Additionally, the simplicity of the
algorithm implies that even junior
hackers without knowledge of
advanced image processing and
biometric databases can still break into
protected templates and reveal
relationships among templates
produced by different recognition
methods.
4. R o b u s t
D o c u m e n t
I m a g e
B i n a r i z a t i o n
Te chn ique for
D e g r a d e d
D o c u m e n t
I m a g e s
Segmentation of text from badly
degraded document images is a very
challenging task due to the high
inter/intra-variation between the
document background and the
foreground text of different document
images. In this paper, we propose a
novel document image binarization
technique that addresses these issues by
using adaptive image contrast. The
adaptive image contrast is a
combination of the local image contrast
and the local image gradient that is
tolerant to text and background
variation caused by different types of
document degradations. In the
proposed technique, an adaptive
contrast map is first constructed for an
input degraded document image. The
contrast map is then binarized and
combined with Canny's edge map to
identify the text stroke edge pixels. The
document text is further segmented by
a local threshold that is estimated based
on the intensities of detected text stroke
2013

edge pixels within a local window. The
proposed method is simple, robust, and
involves minimum parameter tuning. It
has been tested on three public
datasets that are used in the recent
document image binarization contest
(DIBCO) 2009 & 2011 and handwritten-
DIBCO 2010 and achieves accuracies of
93.5%, 87.8%, and 92.03%, respectively,
that are significantly higher than or close
to that of the best-performing methods
reported in the three contests.
Experiments on the Bickley diary dataset
that consists of several challenging bad
quality document images also show the
superior performance of our proposed
method, compared with other
techniques.
5. P e r - C o l o r a n t -
Channel Color
B a r c o d e s f o r
M o b i l e
Applications: An
I n t e r f e r e n c e
C a n c e l l a t i o n
F r a m e w o r k
We propose a color barcode framework
for mobile phone applications by
exploiting the spectral diversity afforded
by the cyan (C), magenta (M), and
yellow (Y) print colorant channels
commonly used for color printing and
the complementary red (R), green (G),
and blue (B) channels, respectively,
used for capturing color images.
Specifically, we exploit this spectral
diversity to realize a three-fold increase
in the data rate by encoding
independent data in the C, M, and Y
print colorant channels and decoding
the data from the complementary R, G,
and B channels captured via a mobile
phone camera. To mitigate the effect of
cross-channel interference among the
print-colorant and capture color
channels, we develop an algorithm for
interference cancellation based on a
physically-motivated mathematical
model for the print and capture
processes. To estimate the model
parameters required for cross-channel
2013

interference cancellation, we propose
two alternative methodologies: a pilot
block approach that uses suitable
selections of colors for the
synchronization blocks and an
expectation maximization approach
that estimates the parameters from
regions encoding the data itself. We
evaluate the performance of the
proposed framework using specific
implementations of the framework for
two of the most commonly used
barcodes in mobile applications, QR
and Aztec codes. Experimental results
show that the proposed framework
successfully overcomes the impact of
the color interference, providing a low
bit error rate and a high decoding rate
for each of the colorant channels when
used with a corresponding error
correction scheme.
1. A N e i g h b o r
Coverage-Based
P r o b a b i l i s t i c
Rebroadcast for
R e d u c i n g
R o u t i n g
O v e r h e a d i n
Mobile Ad Hoc
N e t w o r k s
Due to high mobility of nodes in mobile
ad hoc networks (MANETs), there exist
frequent link breakages which lead to
frequent path failures and route
discoveries. The overhead of a route
discovery cannot be neglected. In a
route discovery, broadcasting is a
fundamental and effective data
dissemination mechanism, where a
mobile node blindly rebroadcasts the
first received route request packets
unless it has a route to the destination,
and thus it causes the broadcast storm
problem. In this paper, we propose a
2013
TECHNOLOGY: JAVA
DOMAIN: MOBILE COMPUTING

neighbor coverage-based probabilistic
rebroadcast protocol for reducing
routing overhead in MANETs. In order to
effectively exploit the neighbor
coverage knowledge, we propose a
novel rebroadcast delay to determine
the rebroadcast order, and then we
can obtain the more accurate
additional coverage ratio by sensing
neighbor coverage knowledge. We
also define a connectivity factor to
provide the node density adaptation.
By combining the additional coverage
ratio and connectivity factor, we set a
reasonable rebroadcast probability.
Our approach combines the
advantages of the neighbor coverage
knowledge and the probabilistic
mechanism, which can significantly
decrease the number of retransmissions
so as to reduce the routing overhead,
and can also improve the routing
performance.
2. Relay Selection
for Geographical
Forwa rd in g in
S l e e p - W a k e
Cycling Wireless
Sensor Networks
Our work is motivated by geographical
forwarding of sporadic alarm packets
to a base station in a wireless sensor
network (WSN), where the nodes are
sleep-wake cycling periodically and
asynchronously. We seek to develop
local forwarding algorithms that can be
tuned so as to tradeoff the end-to-end
delay against a total cost, such as the
hop count or total energy. Our
approach is to solve, at each
forwarding node enroute to the sink,
the local forwarding problem of
minimizing one-hop waiting delay
subject to a lower bound constraint on
a suitable reward offered by the next-
hop relay; the constraint serves to tune
the tradeoff. The reward metric used for
the local problem is based on the end-
to-end total cost objective (for
2013

instance, when the total cost is hop
count, we choose to use the progress
toward sink made by a relay as the
reward). The forwarding node, to begin
with, is uncertain about the number of
relays, their wake-up times, and the
reward values, but knows the
probability distributions of these
quantities. At each relay wake-up
instant, when a relay reveals its reward
value, the forwarding node's problem is
to forward the packet or to wait for
further relays to wake-up. In terms of
the operations research literature, our
work can be considered as a variant of
the asset selling problem. We formulate
our local forwarding problem as a
partially observable Markov decision
process (POMDP) and obtain inner and
outer bounds for the optimal policy.
Motivated by the computational
complexity involved in the policies
derived out of these bounds, we
formulate an alternate simplified
model, the optimal policy for which is a
simple threshold rule. We provide
simulation results to compare the
performance of the inner and outer
bound policies against the simple
policy, and also against the optimal
policy when the source knows the
exact number of relays. Observing the
good performance and the ease of
implementation of the simple policy,
we apply it to our motivating problem,
i.e., local geographical routing of
sporadic alarm packets in a large WSN.
We compare the end-to-end
performance (i.e., average total delay
and average total cost) obtained by
the simple policy, when used for local
geographical forwarding, against that
obtained by the globally optimal

forwarding algorithm proposed by Kim
et al.
3. Toward Privacy
Preserving and
C o l l u s i o n
Resistance in a
Location Proof
Updating System
Today's location-sensitive service relies
on user's mobile device to determine
the current location. This allows
malicious users to access a restricted
resource or provide bogus alibis by
cheating on their locations. To address
this issue, we propose A Privacy-
Preserving LocAtion proof Updating
System (APPLAUS) in which colocated
Bluetooth enabled mobile devices
mutually generate location proofs and
send updates to a location proof
server. Periodically changed
pseudonyms are used by the mobile
devices to protect source location
privacy from each other, and from the
untrusted location proof server. We also
develop user-centric location privacy
model in which individual users
evaluate their location privacy levels
and decide whether and when to
accept the location proof requests. In
order to defend against colluding
attacks, we also present betweenness
ranking-based and correlation
clustering-based approaches for outlier
detection. APPLAUS can be
implemented with existing network
infrastructure, and can be easily
deployed in Bluetooth enabled mobile
devices with little computation or
power cost. Extensive experimental
results show that APPLAUS can
effectively provide location proofs,
significantly preserve the source
location privacy, and effectively detect
colluding attacks.
2013
4. D i s t r i b u t e d
C o o p e r a t i o n
and Diversity for
Hybrid Wireless
In this paper, we propose a new
Distributed Cooperation and Diversity
Combining framework. Our focus is on
heterogeneous networks with devices
2013

N e t w o r k s equipped with two types of radio
frequency (RF) interfaces: short-range
high-rate interface (e.g., IEEE802.11),
and a long-range low-rate interface
(e.g., cellular) communicating over
urban Rayleigh fading channels. Within
this framework, we propose and
evaluate a set of distributed
cooperation techniques operating at
different hierarchical levels with
resource constraints such as short-range
RF bandwidth. We propose a Priority
Maximum-Ratio Combining (PMRC)
technique, and a Post Soft-
Demodulation Combining (PSDC)
technique. We show that the proposed
techniques achieve significant
improvements on Signal to Noise Ratio
(SNR), Bit Error Rate (BER) and
throughput through analysis, simulation,
and experimentation on our software
radio testbed. Our results also indicate
that, under several communication
scenarios, PMRC and PSDC can
improve the throughput performance
by over an order of magnitude.
5. T o w a r d a
S t a t i s t i c a l
Framework for
S o u r c e
A n o n y m i t y i n
Sensor Networks
In certain applications, the locations of
events reported by a sensor network
need to remain anonymous. That is,
unauthorized observers must be unable
to detect the origin of such events by
analyzing the network traffic. Known as
the source anonymity problem, this
problem has emerged as an important
topic in the security of wireless sensor
networks, with variety of techniques
based on different adversarial
assumptions being proposed. In this
work, we present a new framework for
modeling, analyzing, and evaluating
anonymity in sensor networks. The
novelty of the proposed framework is
twofold: first, it introduces the notion of
2013

"interval indistinguishability” and
provides a quantitative measure to
model anonymity in wireless sensor
networks; second, it maps source
anonymity to the statistical problem of
binary hypothesis testing with nuisance
parameters. We then analyze existing
solutions for designing anonymous
sensor networks using the proposed
model. We show how mapping source
anonymity to binary hypothesis testing
with nuisance parameters leads to
converting the problem of exposing
private source information into
searching for an appropriate data
transformation that removes or minimize
the effect of the nuisance information.
By doing so, we transform the problem
from analyzing real-valued sample
points to binary codes, which opens the
door for coding theory to be
incorporated into the study of
anonymous sensor networks. Finally, we
discuss how existing solutions can be
modified to improve their anonymity.
6. V a m p i r e
Attacks: Draining
Life from Wireless
Ad Hoc Sensor
N e t w o r k s
Ad hoc low-power wireless networks
are an exciting research direction in
sensing and pervasive computing. Prior
security work in this area has focused
primarily on denial of communication
at the routing or medium access
control levels. This paper explores
resource depletion attacks at the
routing protocol layer, which
permanently disable networks by
quickly draining nodes' battery power.
These "Vampire” attacks are not
specific to any specific protocol, but
rather rely on the properties of many
popular classes of routing protocols. We
find that all examined protocols are
susceptible to Vampire attacks, which
are devastating, difficult to detect, and
2013

are easy to carry out using as few as
one malicious insider sending only
protocol-compliant messages. In the
worst case, a single Vampire can
increase network-wide energy usage
by a factor of O(N), where N in the
number of network nodes. We discuss
methods to mitigate these types of
attacks, including a new proof-of-
concept protocol that provably
bounds the damage caused by
Vampires during the packet forwarding
phase.
1. On I nference-
P r o o f V i e w
P r o c e s s in g o f
XML Documents
This work aims at treating the inference
problem in XML documents that are
assumed to represent potentially
incomplete information. The inference
problem consists in providing a control
mechanism for enforcing inference-
usability confinement of XML
documents. More formally, an
inference-proof view of an XML
document is required to be both
indistinguishable from the actual XML
document to the clients under their
inference capabilities, and to neither
contain nor imply any confidential
information. We present an algorithm
for generating an inference-proof view
by weakening the actual XML
document, i.e., eliminating confidential
information and other information that
could be used to infer confidential
information. In order to avoid
inferences based on the schema of the
XML documents, the DTD of the actual
XML document is modified according
2013
TECHNOLOGY: JAVA
DOMAIN: DEPENDABLE AND SECURE COMPUTING

to the weakening operations as well,
such that the modified DTD conforms
with the generated inference-proof
view.
2. S O R T : A S e l f -
ORganizing Trust
Model for Peer-
to-Peer Systems
2013
1. A D i s t r i b u t e d
Control Law for
Load Balancing
i n C o n t e n t
D e l i v e r y
N e t w o r k s
In this paper, we face the challenging
issue of defining and implementing an
effective law for load balancing in
Content Delivery Networks (CDNs). We
base our proposal on a formal study of
a CDN system, carried out through the
exploitation of a fluid flow model
characterization of the network of
servers. Starting from such
characterization, we derive and prove
a lemma about the network queues
equilibrium. This result is then leveraged
in order to devise a novel distributed
and time-continuous algorithm for load
balancing, which is also reformulated in
a time-discrete version. The discrete
formulation of the proposed balancing
law is eventually discussed in terms of its
actual implementation in a real-world
scenario. Finally, the overall approach
is validated by means of simulations.
2013
2. A c h i e v i n g
Efficient Flooding
by Utilizing Link
Correl ation in
Wireless Sensor
N e t w o r k s
Although existing flooding protocols
can provide efficient and reliable
communication in wireless sensor
networks on some level, further
performance improvement has been
hampered by the assumption of link
2013
TECHNOLOGY: JAVA
DOMAIN: NETWORKING

independence, which requires costly
acknowledgments (ACKs) from every
receiver. In this paper, we present
collective flooding (CF), which exploits
the link correlation to achieve flooding
reliability using the concept of
collective ACKs. CF requires only 1-hop
information at each node, making the
design highly distributed and scalable
with low complexity. We evaluate CF
extensively in real-world settings, using
three different types of testbeds: a
single-hop network with 20 MICAz
nodes, a multihop network with 37
nodes, and a linear outdoor network
with 48 nodes along a 326-m-long
bridge. System evaluation and
extensive simulation show that CF
achieves the same reliability as state-of-
the-art solutions while reducing the
total number of packet transmission
and the dissemination delay by 30%-
50% and 35%-50%, respectively.
3. C o m p l e x i t y
A n a l y s i s a n d
Algorithm Design
f o r A d v a n c e
B a n d w i d t h
Sch e d ul in g in
D e d i c a t e d
N e t w o r k s
An increasing number of high-
performance networks provision
dedicated channels through circuit
switching or MPLS/GMPLS techniques to
support large data transfer. The link
bandwidths in such networks are
typically shared by multiple users
through advance reservation, resulting
in varying bandwidth availability in
future time. Developing efficient
scheduling algorithms for advance
bandwidth reservation has become a
critical task to improve the utilization of
network resources and meet the
transport requirements of application
users. We consider an exhaustive
combination of different path and
bandwidth constraints and formulate
four types of advance bandwidth
scheduling problems, with the same
2013

objective to minimize the data transfer
end time for a given transfer request
with a prespecified data size: fixed path
with fixed bandwidth (FPFB); fixed path
with variable bandwidth (FPVB);
variable path with fixed bandwidth
(VPFB); and variable path with variable
bandwidth (VPVB). For VPFB and VPVB,
we further consider two subcases
where the path switching delay is
negligible or nonnegligible. We propose
an optimal algorithm for each of these
scheduling problems except for FPVB
and VPVB with nonnegligible path
switching delay, which are proven to
be NP-complete and
nonapproximable, and then tackled by
heuristics. The performance superiority
of these heuristics is verified by
extensive experimental results in a large
set of simulated networks in comparison
to optimal and greedy strategies.
4. E f f i c i e n t
Algorith ms for
N e i g h b o r
D i s c o v e r y i n
Wireless Networks
Neighbor discovery is an important first
step in the initialization of a wireless ad
hoc network. In this paper, we design
and analyze several algorithms for
neighbor discovery in wireless networks.
Starting with a single-hop wireless
network of n nodes, we propose a
Θ(nlnn) ALOHA-like neighbor discovery
algorithm when nodes cannot detect
collisions, and an order-optimal Θ(n)
receiver feedback-based algorithm
when nodes can detect collisions. Our
algorithms neither require nodes to
have a priori estimates of the number
of neighbors nor synchronization
between nodes. Our algorithms allow
nodes to begin execution at different
time instants and to terminate neighbor
discovery upon discovering all their
neighbors. We finally show that receiver
feedback can be used to achieve a
2013

Θ(n) running time, even when nodes
cannot detect collisions. We then
analyze neighbor discovery in a
general multihop setting. We establish
an upper bound of O(Δlnn) on the
running time of the ALOHA-like
algorithm, where Δ denotes the
maximum node degree in the network
and n the total number of nodes. We
also establish a lower bound of
Ω(Δ+lnn) on the running time of any
randomized neighbor discovery
algorithm. Our result thus implies that
the ALOHA-like algorithm is at most a
factor min(Δ,lnn) worse than optimal.
5. S e m i- R a n d o m
Backoff: Towards
R e s o u r c e
Reservation for
Channel Access
in Wireless LANs
This paper proposes a semi-random
backoff (SRB) method that enables
resource reservation in contention-
based wireless LANs. The proposed SRB
is fundamentally different from
traditional random backoff methods
because it provides an easy migration
path from random backoffs to
deterministic slot assignments. The
central idea of the SRB is for the wireless
station to set its backoff counter to a
deterministic value upon a successful
packet transmission. This deterministic
value will allow the station to reuse the
time-slot in consecutive backoff cycles.
When multiple stations with successful
packet transmissions reuse their
respective time-slots, the collision
probability is reduced, and the channel
achieves the equivalence of resource
reservation. In case of a failed packet
transmission, a station will revert to the
standard random backoff method and
probe for a new available time-slot. The
proposed SRB method can be readily
applied to both 802.11 DCF and
802.11e EDCA networks with minimum
modification to the existing DCF/EDCA
2013

implementations. Theoretical analysis
and simulation results validate the
superior performance of the SRB for
small-scale and heavily loaded wireless
LANs. When combined with an
adaptive mechanism and a persistent
backoff process, SRB can also be
effective for large-scale and lightly
loaded wireless networks.
6. A U t i l i t y
M a x i m i z a t i o n
Framework for
Fair and Efficient
Multicasting in
M u l t i c a r r i e r
Wireless Cellular
N e t w o r k s
Multicast/broadcast is regarded as an
efficient technique for wireless cellular
networks to transmit a large volume of
common data to multiple mobile users
simultaneously. To guarantee the
quality of service for each mobile user
in such single-hop multicasting, the
base-station transmitter usually adapts
its data rate to the worst channel
condition among all users in a multicast
group. On one hand, increasing the
number of users in a multicast group
leads to a more efficient utilization of
spectrum bandwidth, as users in the
same group can be served together.
On the other hand, too many users in a
group may lead to unacceptably low
data rate at which the base station
can transmit. Hence, a natural question
that arises is how to efficiently and fairly
transmit to a large number of users
requiring the same message. This paper
endeavors to answer this question by
studying the problem of multicasting
over multicarriers in wireless orthogonal
frequency division multiplexing (OFDM)
cellular systems. Using a unified utility
maximization framework, we
investigate this problem in two typical
scenarios: namely, when users
experience roughly equal path losses
and when they experience different
path losses, respectively. Through
theoretical analysis, we obtain optimal
2013

multicast schemes satisfying various
throughput-fairness requirements in
these two cases. In particular, we show
that the conventional multicast scheme
is optimal in the equal-path-loss case
regardless of the utility function
adopted. When users experience
different path losses, the group
multicast scheme, which divides the
users almost equally into many
multicast groups and multicasts to
different groups of users over
nonoverlapping subcarriers, is optimal .
1. A S e c u r e
P a y m e n t
Scheme with Low
Communication
and Processing
O v e rh e a d f o r
Multihop Wireless
N e t w o r k s
We propose RACE, a report-based
payment scheme for multihop wireless
networks to stimulate node
cooperation, regulate packet
transmission, and enforce fairness. The
nodes submit lightweight payment
reports (instead of receipts) to the
accounting center (AC) and
temporarily store undeniable security
tokens called Evidences. The reports
contain the alleged charges and
rewards without security proofs, e.g.,
signatures. The AC can verify the
payment by investigating the
consistency of the reports, and clear
the payment of the fair reports with
almost no processing overhead or
cryptographic operations. For cheating
reports, the Evidences are requested to
identify and evict the cheating nodes
that submit incorrect reports. Instead of
requesting the Evidences from all the
nodes participating in the cheating
reports, RACE can identify the cheating
2013
TECHNOLOGY: JAVA
DOMAIN: PARALLEL AND DISTRIBUTED SYSTEMS

nodes with requesting few Evidences.
Moreover, Evidence aggregation
technique is used to reduce the
Evidences' storage area. Our analytical
and simulation results demonstrate that
RACE requires much less
communication and processing
overhead than the existing receipt-
based schemes with acceptable
payment clearance delay and storage
area. This is essential for the effective
implementation of a payment scheme
because it uses micropayment and the
overhead cost should be much less
than the payment value. Moreover,
RACE can secure the payment and
precisely identify the cheating nodes
without false accusations.
2. Cluster-Based
Certificate
Revocation with
Vindication
Capability for
Mobile Ad Hoc
Networks
Mobile ad hoc networks (MANETs) have
attracted much attention due to their
mobility and ease of deployment.
However, the wireless and dynamic
natures render them more vulnerable
to various types of security attacks than
the wired networks. The major
challenge is to guarantee secure
network services. To meet this
challenge, certificate revocation is an
important integral component to
secure network communications. In this
paper, we focus on the issue of
certificate revocation to isolate
attackers from further participating in
network activities. For quick and
accurate certificate revocation, we
propose the Cluster-based Certificate
Revocation with Vindication Capability
(CCRVC) scheme. In particular, to
improve the reliability of the scheme,
we recover the warned nodes to take
part in the certificate revocation
process; to enhance the accuracy, we
propose the threshold-based
2013

mechanism to assess and vindicate
warned nodes as legitimate nodes or
not, before recovering them. The
performances of our scheme are
evaluated by both numerical and
simulation analysis. Extensive results
demonstrate that the proposed
certificate revocation scheme is
effective and efficient to guarantee
secure communications in mobile ad
hoc networks.
3. Fault Tolerance
in Distributed
Systems Using
Fused Data
Structures
Replication is the prevalent solution to
tolerate faults in large data structures
hosted on distributed servers. To
tolerate f crash faults
(dead/unresponsive data structures)
among n distinct data structures,
replication requires f + 1 replicas of
each data structure, resulting in nf
additional backups. We present a
solution, referred to as fusion that uses a
combination of erasure codes and
selective replication to tolerate f crash
faults using just f additional fused
backups. We show that our solution
achieves O(n) savings in space over
replication. Further, we present a
solution to tolerate f Byzantine faults
(malicious data structures), that
requires only nf + f backups as
compared to the 2nf backups required
by replication. We explore the theory of
fused backups and provide a library of
such backups for all the data structures
in the Java Collection Framework. The
theoretical and experimental
evaluation confirms that the fused
backups are space-efficient as
compared to replication, while they
cause very little overhead for normal
operation. To illustrate the practical
usefulness of fusion, we use fused
backups for reliability in Amazon's highly
2013

available key-value store, Dynamo.
While the current replication-based
solution uses 300 backup structures, we
present a solution that only requires 120
backup structures. This results in savings
in space as well as other resources such
as power.
4. Flexible
Symmetrical
Global-Snapshot
Algorithms for
Large-Scale
Distributed
Systems
Most existing global-snapshot
algorithms in distributed systems use
control messages to coordinate the
construction of a global snapshot
among all processes. Since these
algorithms typically assume the
underlying logical overlay topology is
fully connected, the number of control
messages exchanged among the
whole processes is proportional to the
square of number of processes,
resulting in higher possibility of network
congestion. Hence, such algorithms are
neither efficient nor scalable for a
large-scale distributed system
composed of a huge number of
processes. Recently, some efforts have
been presented to significantly reduce
the number of control messages, but
doing so incurs higher response time
instead. In this paper, we propose an
efficient global-snapshot algorithm able
to let every process finish its local
snapshot in a given number of rounds.
Particularly, such an algorithm allows a
tradeoff between the response time
and the message complexity.
Moreover, our global-snapshot
algorithm is symmetrical in the sense
that identical steps are executed by
every process. This means that our
algorithm is able to achieve better
workload balance and less network
congestion. Most importantly, based on
our framework, we demonstrate that
the minimum number of control
2013

messages required by a symmetrical
global-snapshot algorithm is Omega
(Nlog N), where N is the number of
processes. Finally, we also assume non-
FIFO channels.
5. High
Performance
Resource
Allocation
Strategies for
Computational
Economies
Utility computing models have long
been the focus of academic research,
and with the recent success of
commercial cloud providers,
computation and storage is finally
being realized as the fifth utility.
Computational economies are often
proposed as an efficient means of
resource allocation, however adoption
has been limited due to a lack of
performance and high overheads. In
this paper, we address the
performance limitations of existing
economic allocation models by
defining strategies to reduce the failure
and reallocation rate, increase
occupancy and thereby increase the
obtainable utilization of the system. The
high-performance resource utilization
strategies presented can be used by
market participants without requiring
dramatic changes to the allocation
protocol. The strategies considered
include overbooking, advanced
reservation, just-in-time bidding, and
using substitute providers for service
delivery. The proposed strategies have
been implemented in a distributed
metascheduler and evaluated with
respect to Grid and cloud
deployments. Several diverse synthetic
workloads have been used to quantity
both the performance benefits and
economic implications of these
strategies.
2013
6. Optimal Client- We investigate an underlying 2013

Server
Assignment for
Internet
Distributed
Systems
mathematical model and algorithms
for optimizing the performance of a
class of distributed systems over the
Internet. Such a system consists of a
large number of clients who
communicate with each other
indirectly via a number of intermediate
servers. Optimizing the overall
performance of such a system then
can be formulated as a client-server
assignment problem whose aim is to
assign the clients to the servers in such
a way to satisfy some prespecified
requirements on the communication
cost and load balancing. We show that
1) the total communication load and
load balancing are two opposing
metrics, and consequently, their
tradeoff is inherent in this class of
distributed systems; 2) in general,
finding the optimal client-server
assignment for some prespecified
requirements on the total load and
load balancing is NP-hard, and
therefore; 3) we propose a heuristic via
relaxed convex optimization for finding
the approximate solution. Our
simulation results indicate that the
proposed algorithm produces superior
performance than other heuristics,
including the popular Normalized Cuts
algorithm.
7. Scheduling
Sensor Data
Collection with
Dynamic Traffic
Patterns
The network traffic pattern of
continuous sensor data collection often
changes constantly over time due to
the exploitation of temporal and spatial
data correlations as well as the nature
of condition-based monitoring
applications. This paper develops a
novel TDMA schedule that is capable
of efficiently collecting sensor data for
any network traffic pattern and is thus
well suited to continuous data
2013

collection with dynamic traffic patterns.
Following this schedule, the energy
consumed by sensor nodes for any
traffic pattern is very close to the
minimum required by their workloads
given in the traffic pattern. The
schedule also allows the base station to
conclude data collection as early as
possible according to the traffic load,
thereby reducing the latency of data
collection. Experimental results using
real-world data traces show that,
compared with existing schedules that
are targeted on a fixed traffic pattern,
our proposed schedule significantly
improves the energy efficiency and
time efficiency of sensor data
collection with dynamic traffic patterns.
1. Ant Colony
Optimization for
Software Project
Scheduling and
Staffing with an
Event-Based
Scheduler
Research into developing effective
computer aided techniques for
planning software projects is important
and challenging for software
engineering. Different from projects in
other fields, software projects are
people-intensive activities and their
related resources are mainly human
resources. Thus, an adequate model for
software project planning has to deal
with not only the problem of project
task scheduling but also the problem of
human resource allocation. But as both
of these two problems are difficult,
existing models either suffer from a very
large search space or have to restrict
the flexibility of human resource
allocation to simplify the model. To
develop a flexible and effective model
2013
TECHNOLOGY: JAVA
DOMAIN: SOFTWARE ENGINEERING

for software project planning, this
paper develops a novel approach with
an event-based scheduler (EBS) and an
ant colony optimization (ACO)
algorithm. The proposed approach
represents a plan by a task list and a
planned employee allocation matrix. In
this way, both the issues of task
scheduling and employee allocation
can be taken into account. In the EBS,
the beginning time of the project, the
time when resources are released from
finished tasks, and the time when
employees join or leave the project are
regarded as events. The basic idea of
the EBS is to adjust the allocation of
employees at events and keep the
allocation unchanged at nonevents.
With this strategy, the proposed
method enables the modeling of
resource conflict and task preemption
and preserves the flexibility in human
resource allocation. To solve the
planning problem, an ACO algorithm is
further designed. Experimental results
on 83 instances demonstrate that the
proposed method is very promising.

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