Boğaziçi Üniversitesi Bilgisayar Mühendisliği Bölümü'nden Haberlerhttp://www.cmpe.boun.edu.tr/index_tr.phpIlker Demirkol

PhD Thesis Defense


Tarih: 13.06.08 10:00
Yer: A2]]>Fri, 13 Jun 2008http://www.cmpe.boun.edu.tr/announcements/showWeeklyProgram_tr.php?eventid=130 Ilker S. Demirkol, PhD Defense

Abstract:


Wireless sensor networks (WSNs) present a promising technology for many
applications providing an intelligent and remote observation of a
destination. Among the various potential applications, there are health
monitoring, disaster monitoring, habitat monitoring, precision agriculture,
surveillance systems. With the ongoing research both on new sensor types and
on the hardware for improved computation, communication and power
capacities, novel application areas are also expected.


Due to the limited power sources of the sensor nodes which are generally
irreplaceable, the WSN research is focused on the energy-efficient network
operation. This energy concern requires new studies at each networking layer
including the medium access control (MAC) layer. In this thesis, we
investigate a number of MAC layer performance issues for WSN by first
presenting a comparative survey of different MAC protocol schemes proposed
in the literature. For the correct performance evaluation of the protocols,
one needs to utilize a realistic packet traffic model that reflects the
specific features of the WSN application represented. We derive an
analytical packet traffic model for Surveillance WSN where sensor nodes
inform the sink for detected intrusion events. The sensor detection model
used is probabilistic and parametric which enables the adaptation of the
packet traffic model to the sensor types deployed.


One important contribution of this thesis is the optimization of the MAC
layer contentions for the minimization of the energy consumption or the
delay incurred in contention slotted medium access protocols. This is
achieved by the derivation of the two separate formula for the energy
consumption and the contention delay and, then, extracting the contention
window size that optimizes the corresponding performance metric. For its
practical implementation in the distributed environment of WSNs, a method is
proposed which achieve near-optimal performance values.


To investigate the effect of the contention optimization proposed on the
overall network performance, the video sensor networks (VSNs)are studied.
VSNs are a special type of WSNs where the sensor nodes are equipped with
cameras and send image or video of a target area based on the specifications
of the application. First, the network performance of the VSNs is investigated via simulations for the currently available hardware
technology. Then, by applying the contention optimization proposed in this
thesis, we show how the capacity of VSNs can be improved with intelligent
contention window size setting.

Tarih: 13.06.08 10:00
Yer: A2]]>Fri, 13 Jun 2008http://www.cmpe.boun.edu.tr/announcements/showWeeklyProgram_tr.php?eventid=131 Murat Sensoy

AILAB Seminars

Tarih: 09.05.08 13:00
Yer: ETA 16]]>Fri, 09 May 2008http://www.cmpe.boun.edu.tr/announcements/showWeeklyProgram_tr.php?eventid=129 Murat Sensoy

AILAB Seminar

Tarih: 06.05.08 13:00
Yer: ETA 16]]>Tue, 06 May 2008http://www.cmpe.boun.edu.tr/announcements/showWeeklyProgram_tr.php?eventid=128 Esra Erdem, Sabancı University

Abstract: Evolutionary relations between species can be modeled as a phylogenetic tree --- a tree where the leaves represent the extant species, the internal vertices represent their ancestors, and the edges represent the genetic relations between them. We
study the problem of reconstructing such a tree for a set of taxa. The first part of the talk is about the description of this problem in the declarative knowledge representation formalism of answer set programming, and how to use computational methods of answer set programming to generate conjectures about the evolution of the given taxa. In the second part of the talk we apply this computational method in two domains: to historical analysis of languages, and to historical analysis of parasite-host systems. In particular, we discuss the computation of some plausible phylogenies for Chinese dialects, for Indo-European language groups, and for Alcataenia species.



Tarih: 06.05.08 12:00
Yer: Seminar Room, No:16]]>Tue, 06 May 2008http://www.cmpe.boun.edu.tr/announcements/showWeeklyProgram_tr.php?eventid=127 Reyhan Aydogan

AILAB Seminar

Tarih: 29.04.08 13:00
Yer: ETA 16]]>Tue, 29 Apr 2008http://www.cmpe.boun.edu.tr/announcements/showWeeklyProgram_tr.php?eventid=124 Major R&D Cnetres

Softlab Seminar

Tarih: 29.04.08 10:45
Yer: Seminar Room, No:16]]>Tue, 29 Apr 2008http://www.cmpe.boun.edu.tr/announcements/showWeeklyProgram_tr.php?eventid=126


http://siu2007.anadolu.edu.tr/]]>Sat, 16 Jun 2007http://www.cmpe.boun.edu.tr/announcements/index_tr.php?id=1181986959 anket formunu doldurarak mülakat günü bölüm sekreterliğine
kağıt ortamında teslim etmeleri gerekmektedir. Anket formu
bölüm sekreterliğinden de alınabilir.



Doktora adayları ayrıca "Statement of Purpose" yazmalı
ve her öğretim üyesinin posta kutusuna bir kopyasını
bırakmalıdır. Posta kutuları bölüm sekreterliğindedir.
Doktora mülakatları 26 Ocak 2007 tarihinde 13:30-14:30 arasında
BT16'da (Seminer Odası) yapılacaktır.]]>Sun, 07 Jan 2007http://www.cmpe.boun.edu.tr/announcements/index_tr.php?id=1168200856 Sun, 07 Jan 2007http://www.cmpe.boun.edu.tr/announcements/index_tr.php?id=1168200854