A modified identity-based encryption system for messaging applications

Karatop, Ayşe Gül ; Karatop, Ayse Gul

QA076 Computer software

Identity-based encryption (IBE) systems are relatively recently proposed; yet they are highly popular for messaging applications since they offer new features such as certificateless infrastructure and anonymous communication. However, recent studies also reveal that the infrastructure needed for IBE systems may be as complicated as the conventional public key cryptosytems and not sufficient research has been conducted in relevant issues concerning the infrastructure. Firstly, ...

2008

Thesis ; NonPeerReviewed

http://research.sabanciuniv.edu/14143/1/AyseGulKaratop.pdf ; Karatop, Ayşe Gül (2008) A modified identity-based encryption system for messaging applications. [Thesis]

Efficient distributed privacy preserving clustering

Doğanay, Mahir Can ; Doganay, Mahir Can

TK7885-7895 Computer engineering. Computer hardware

With recent growing concerns about data privacy, researchers have focused their attention to developing new algorithms to perform privacy preserving data mining. However, methods proposed until now are either very inefficient to deal with large datasets, or compromise privacy with accuracy of data mining results. Secure multiparty computation helps researchers develop privacy preserving data mining algorithms without having to compromise quality of data mining results with data ...

2008

Thesis ; NonPeerReviewed

http://research.sabanciuniv.edu/14144/1/MahirCanDoganay.pdf ; Doğanay, Mahir Can (2008) Efficient distributed privacy preserving clustering. [Thesis]

Oku/Read

Öztat Alemdaroğlu, İz ; Oztat Alemdaroglu, Iz

NK1160-1590 Decoration and ornament. Design

This is a supplementary text for the exhibition OKU/ READ and cannot be considered separately from it. “READ” is an assemblage of fragments with references to processes of othering and homogenization, orientalism, post-modern and Islamic architecture, belief systems, women as marker of ideology in society and notions of display. What brings these fragments together is an intellectual and relational process that led to their simultaneous production. Their coexistence creates an ...

2008

Thesis ; NonPeerReviewed

http://research.sabanciuniv.edu/14146/1/IzOztat.pdf ; http://research.sabanciuniv.edu/14146/2/IOAimages.pdf ; http://research.sabanciuniv.edu/14146/3/IOAthesissupplement.pdf ; Öztat Alemdaroğlu, İz (2008) Oku/Read. [Thesis]

Optimal investment strategies with a reallocation constraint

Eğriboyun, Feyzullah ; Egriboyun, Feyzullah ; Soner, Halil Mete

T055.4-60.8 Industrial engineering. Management engineering ; QA Mathematics ; T57.6-57.97 Operations research. Systems analysis

We study a Merton type optimization problem under a reallocation constraint. Under this restriction, the stock holdings can not be liquidated faster than a certain rate. This is a common restriction in certain type of investment firms. Our main objective is to study the large time optimal growth rate of the expected value of the utility from wealth. We also consider a discounted infinite horizon problem as a step towards understanding the first problem. A numerical study is done ...

Springer

2010-06

Article ; PeerReviewed

Eğriboyun, Feyzullah and Soner, Halil Mete (2010) Optimal investment strategies with a reallocation constraint. Mathematical Methods of Operations Research, 71 (3). pp. 551-585. ISSN 1432-2994 (Print) 1432-5217 (Online)

Uncovering the secrets of the 2D random-bond Blume-Capel model

Malakis, A. ; Berker, A. Nihat ; Hadjiagapiou, I. A. ; Fytas, N. G. ; Papakonstantinou, T.

QC Physics

The effects of bond randomness on the ground-state structure, phase diagram and critical behavior of the square lattice ferromagnetic Blume-Capel (BC) model are discussed. The calculation of ground states at strong disorder and large values of the crystal field is carried out by mapping the system onto a network and we search for a minimum cut by a maximum flow method. At finite temperatures the system is studied by an efficient two-stage Wang-Landau (WL) method for several values ...

Elsevier

2010-08-01

Article ; PeerReviewed

http://research.sabanciuniv.edu/14147/1/0912.4586v1.pdf ; Malakis, A. and Berker, A. Nihat and Hadjiagapiou, I. A. and Fytas, N. G. and Papakonstantinou, T. (2010) Uncovering the secrets of the 2D random-bond Blume-Capel model. Physica A: Statistical Mechanics and its Applications (Sp. Iss. SI), 389 (15). pp. 2930-2933. ISSN 0378-4371

Probabilistic facial feature extraction using joint distribution of location and texture information

Yılmaz, Mustafa Berkay ; Yilmaz, Mustafa Berkay ; Erdoğan, Hakan ; Erdogan, Hakan ; Ünel, Mustafa ; Unel, Mustafa

TK5101-6720 Telecommunication

In this work, we propose a method which can extract critical points on a face using both location and texture information. This new approach can automatically learn feature information from training data. It finds the best facial feature locations by maximizing the joint distribution of location and texture parameters. We first introduce an independence assumption. Then, we improve upon this model by assuming dependence of location parameters but independence of texture parameters.We ...

Springer

Bebis, G. ; Boyle, R. ; Parvin, B. ; Koracin, D. ; Kuno, Y. ; Wang, J. ; Pajarola, R. ; Lindstrom, P. ; Hinkenjann, A. ; Encarnacao, M. L. ; Silva, C. T. ; Coming, D.

2009

Papers in Conference Proceedings ; PeerReviewed

http://research.sabanciuniv.edu/14148/1/berkayyilmaz_isvc_final.pdf ; Yılmaz, Mustafa Berkay and Erdoğan, Hakan and Ünel, Mustafa (2009) Probabilistic facial feature extraction using joint distribution of location and texture information. In: 5th International Symposium on Visual Computing, Las Vegas, NV

Şeylerin mırmırı, mırıldanmanın şeyleri/Things get to murmur, murmur gets to be a thing

Ay, Salih Hasan

NK1160-1590 Decoration and ornament. Design

This text, accompanying the exhibition, (named as "things get to murmur, murmur gets to be a thing"), aims to provide a possible access to the works. It has been constructed in agreement with the works becoming and emerging in the studio environment. In that respect, rather than giving an interpretation or definition of the exhibition, this text should be considered as an elongated artist's statement written during the artistic production process.

2008

Thesis ; NonPeerReviewed

http://research.sabanciuniv.edu/14149/1/HasanSalihAy.pdf ; Ay, Salih Hasan (2008) Şeylerin mırmırı, mırıldanmanın şeyleri/Things get to murmur, murmur gets to be a thing. [Thesis]

Planning of emergency medical service stations and ambulances

Başar, Ayfer ; Basar, Ayfer

T055.4-60.8 Industrial engineering. Management engineering

In this thesis, we address the Emergency Medical Service (EMS) stations location problem. Firstly, we propose a Backup Double Covering Model (BDCM) as a variant of the well-known Maximal Covering Location Problem where two types of service requests are fulfilled. The objective of the model is to maximize the total population serviced within t1 and t2 minutes (t1 < t2) using two distinct EMS stations where the total number of stations is limited. Our aim in doing so is to provide ...

2008

Thesis ; NonPeerReviewed

http://research.sabanciuniv.edu/14150/1/AyferBasar.pdf ; Başar, Ayfer (2008) Planning of emergency medical service stations and ambulances. [Thesis]

Design and realization of an embedded processor for cryptographic applications

Kocabaş, Övünç ; Kocabas, Ovunc

TK7885-7895 Computer engineering. Computer hardware

Architectural enhancements are a set of modifications in a general-purpose processor to improve the processing of a given workload such as multimedia applications and cryptographic operations. Employing faster/enhanced arithmetic units for the existing instruction set architecture (ISA), introducing application-specific instructions to the ISA, and adding a new set of registers are common practices employed as architectural enhancements. In this thesis, we introduce and implement ...

2008

Thesis ; NonPeerReviewed

http://research.sabanciuniv.edu/14151/1/OvuncKocabas.pdf ; Kocabaş, Övünç (2008) Design and realization of an embedded processor for cryptographic applications. [Thesis]

Synthesis and optimization of carbon nanofiber templated polypyrrole

Erden, Ayça ; Erden, Ayca

TA401-492 Materials of engineering and construction. Mechanics of materials

In order to suggest a new promising material to be used as an active material in supercapacitor applications, carbon nanofiber templated Polypyrrole was designed and synthesized. The common conducting polymer/ carbon nanofiber composites used in capacitive applications were usually physically mixed composites of the materials. In this thesis, the outcomes are investigated when these materials of interest are chemically bonded via electropolymerization. Carbon nanofibers with a ...

2008

Thesis ; NonPeerReviewed

http://research.sabanciuniv.edu/14152/1/AycaErden.pdf ; Erden, Ayça (2008) Synthesis and optimization of carbon nanofiber templated polypyrrole. [Thesis]