Thesis defense - Eren Esgin

Title: SEQUENCE ALIGNMENT BASED PROCESS FAMILY EXTRACTION

PhD Candidate: Eren Esgin

Program: Informations Systems Department 

Date: 17 December 10:00

Place: Conference Hall-01

Abstract: Business Process Management (BPM) paradigm gains growing attention by generic process design and execution capabilities empowered by process-aware information systems. During execution of these transactional information systems, end-users leave traces in the form of event logs, which can be used as a main data source for end user behavior analysis. Process mining encompasses the techniques for automated process discovery from these event logs, conformance checking between the reference process model and process executions, as well as analyzing, predicting and enhancing the performance of business processes. With the emergence of new shared economical models and system architectures, monolithic process perspective is evolved through cross-organizational applications. While contemporary information systems provide functionality for process management within the organizations, a systematic approach to support and analyze multiorganizational processes is missing. Cross-organizational process mining supports the use of commonality and collaboration for process configuration. However, this functionality surplus creates the challenge of dealing with variability across organizations. In this study, we propose a three phased cross-organizational process mining framework in order to extract the commonalities among different organizations serving the same business values. While dominant behavior extraction phase initially derives the sequence of tasks expressing the most typical behavior within the process instances, sequence alignment phase measures the degree of similarities between the process candidates by confidenceenhanced cost functioning, and depicts the neighborhood among these alternatives in terms of process family tree. At process configuration phase, common regions that indicate a functional inheritance or abstractions in the process families are visualized at sequence alignment matrices and interpreted by new feature sets, namely identical and maximal identical pair. According to the experimental results, proposed approach presents a viable and robust cost function in incorporating the business context at process similarity measurement and clustering the process alternatives into process families. 

Announcement Category

Orientation Meetings

Dear Students,

There will be orientation and information meetings for new students who will be registered for 2018-2019 1st semester.

Meetings' informations are given below.

Information Systems Ph.D. and M.S. Programs

On Wednesday, September 26, 2018 at 10.00, class II-04

Cyber Security Non-Thesis M.S. Program

On Wednesday, September 26, 2018 at 10.00, class II-05

Cognitive Science Doctorate and Non-Thesis M.S. Programs

On Wednesday, September 26, 2018 at 10.00, class II-03

Health Informatics Ph.D., M.S. and Bioinformatics M.S Prorams

On Wednesday, September 26, 2018 at 10.00, class II-02

Multimedia Informatics M.S Program

On Wednesday, September 26, 2018 at 10.00, class II-01

The following forms, which will be provided by us to the attending students , will be filled on the same day together with the administrative advisors.

 

Öğrenci Bilgi Formu/Student Information Form

Öğrenci Not formu/Student Grade Form

Bilimsel Hazırlık Formu/Scientific Preparation Form

 

In order to complete the forms mentioned above, our students are required to bring the following documents to the meeting.

1 Adet vesikalık resim/1 passport picture

1 Transcript (Undergraduate and Masters Transcript for Ph.D.)

 

* Participation is mandatory for the meeting. We congratulate our new students and wish them success.

Announcement Category

Fundamentals of Deep Learning for Computer Vision - Hands on Workshop

The NVIDIA Deep Learning Institute (DLI) and Graduate School of Informatics, Middle East Technical University (METU) are excited to deliver a hands-on deep learning workshop at Graduate School of Informatics on 22nd September 2018 Saturday exclusively for verifiable academic students, staff, and researchers.

In this full-day workshop, you’ll learn the basics of deep learning by training and deploying neural networks.

Organizer: Dr. Alptekin Temizel is an Associate Professor at the Graduate School of Informatics, Middle East Technical University. He is a Deep Learning Institute (DLI) Certified Instructor and DLI University Ambassador

IMPORTANT: To reserve your seat, you MUST register at https://www.eventbrite.com/myevent?eid=50069629610 with a valid university email address (*.edu.tr).

Announcement Category

2018-2019 Fall Semester ÖYP(Academic Staff Training Program) and Priority Areas ÖYP(ASTP) Registration Procedures

2018-2019  1. Dönemi için ODTÜ deki lisansüstü programlara kabul alan ÖYP öğrencileri 31.08.2018-14.09.2018 tarihleri arasında Enstitülere evrak teslim ederek başvuracaklardır.

ÖYP-YÖK Kapsamında ODTÜ de öğrenim hakkı kazanan ÖYP Araştırma Görevlilerinden istenecek belgeler:

1)YÖK tarafından ÖYP Araştırma Görevlisi olarak atandıklarına dair belge fotokopisi

2)YÖK tarafından ODTÜ ye lisansüstü öğrenci olarak kayıt hakkı kazandıklarına dair belge fotokopisi

3)ALES belgesi (internet çıktısı)

4)Yabancı dil belgesi (internet çıktısı)

5) Lisans transkripti (orijinal) 6) Adres, e-mail ve cep telefonu bilgilerini içeren dilekçe.

Kayıt işlemleri ise 8-11.10.2018 tarihleri arasında Öğrenci İşleri Daire Başkanlığına yapılacaktır. İstenen kayıt evraklarına ÖİDB ana sayfada lisansüstü kayıtlar kısmından ulaşılmaktadır. ( http://oidb.metu.edu.tr/lisansustu-ogrencilerin-universiteye-kayitlari ).

Kayıt işlemleri için belirlenen tarihlerde kayıt yaptırmanın yanı sıra; ders ekleme ve danışman onayı alma işlemlerinin de, ilgili bölümlere giderek, yapılması gerekmektedir.

Announcement Category

Thesis defense - Fatemeh Soleymani

Graduate School of Informatics /Cognitive Sciences

In partial fulfillment of the requirements for the degree of Master of Science Fatemeh Soleymani will defend his thesis.

Title: EYE MOVEMENT CONTROL IN PERSIAN READING: A CORPUS-ANALYTIC APPROACH

Date: 06th September 2018

Time: 09:30 AM

Place: A-108

Thesis Abstract :In the Latin script languages, specifically the English language, there exist studies on the eye movements’ pattern during reading. Thus, this study was conducted in order to investigate eye movement patterns in Persian. From these sentences, taken from the Bijankhan Persian Corpus, a number of eye movement measures were analyzed. The eye movement measures were first fixation landing position, first fixation duration, gaze duration, first run fixation count, regression in count, and regression out count. The word properties in this study were word length, word frequency, word predictability, word type (opacity and transparency), and phonemes. In order to control variances of random effects which were subject, sentence, and words, the linear mixed model were utilized in the analysis. The results show that word length has an effect on first fixation landing position. Furthermore, the preferred viewing location (PVL) analysis showed that first fixations landed close to the end of short words, close to the center of medium-long words and close to the beginning of long words. These results are in line with former studies. In the first fixation duration analysis it was found that medium-long words were fixated shorter than short words. Moreover, it was found that longer gaze durations (GD) and higher first run fixation count (FRFC) corresponded with longer words. Also, a relationship between regression in count (RIC) and phonemes was obtained.

Announcement Category

Thesis defense - Galip Oral Okan

Graduate School of Informatics /Cyber Security

In partial fulfillment of the requirements for the degree of Master of Science Galip Oral Okan will defend his thesis.

Title: LYNXTUN

Date: 03th Sptember 2018

Time: 14:30 PM

Place: A-108

Thesis Abstract : Lynxtun is a VPN solution that allows the creation of a secure tunnel between two hosts over an insecure network. The Lynxtun Protocol transmits fully encrypted datagrams with a fixed size and at a fixed interval using UDP/IP. Our custom authenticated encryption scheme uses the AES-256 block cipher and modified version of GCM mode in order to decrypt and authenticate datagrams efficiently. It ensures traffic flow confidentiality by maintaining a constant bitrate that does not depend on underlying communication. In this sense, it provides unobservable communication. This constitutes a difficult engineering problem. The protocol design allows implementations to fulfill this requirement. We analyze factors that influence realtime behavior and propose solutions to mitigate this. We developed a full implementation for the GNU/Linux operating system in the C programming language. Our implementation succeeds in performing dispatch operations at the correct time, with a tolerance on the order of microseconds, as we have verified empirically.

Announcement Category

Thesis defense - Faruk Büyüktekin

Graduate School of Informatics /Cognitive Sciences

In partial fulfillment of the requirements for the degree of Master of Science Faruk Büyüktekin will defend his thesis.

Title: MULTI-MODAL REFERENCE RESOLUTION IN SITUATED DIALOGUE THROUGH LINGUISTIC AND EXTRA-LINGUISTIC INFORMATION

Date: 31st August 2018

Time: 10:00 AM

Place: A-108

Thesis Abstract : This thesis investigates the effect of extra-linguistic information incorporated into linguistic information on multimodal reference resolution in Turkish. Identifying reference relations such as anaphora and coreference within texts is quite critical in the fields of natural language processing and human computer interaction since such applications require interpreting the text. Previous research on reference resolution has employed mostly hand-crafted rule-based approaches. However, due to the success of machine learning algorithms, there has been a shift towards corpus-based approaches. Therefore, investigations of reference resolution within real world situations have received a great deal of attention. In line with these developments, this study focuses on a Turkish corpus which is based on the dialogues of two participants collaboratively solving a Tangram puzzle. The corpus includes eye gaze and mouse operations of the participants along with their utterances. This study offers a model that identifies the referent (the object) of a referring expression in the real world by taking eye gaze and operations on puzzle pieces into account. The model is built making use of machine learning algorithms. The model also examines which type of extra linguistic information is more successful in determining the referents of pronouns, non-pronouns and both within a machine learning based-approach.

Announcement Category

Thesis defense - Çağatay Taşcı

Graduate School of Informatics /Cognitive Sciences

In partial fulfillment of the requirements for the degree of Master of Science Çağatay Taşcı will defend his thesis.

Title: AN INVESTIGATION OF BRAIN-TO-BRAIN CONNECTIVITY PATTERNS DURING A COOPERATIVE FLUID INTELLIGENCE TASK

Date: 31st August 2018

Time: 11:30 AM

Place: A-108

Thesis Abstract : Several studies have shown that executing the same task simultaneously can create synchronization among participants’ brain hemodynamics (Funane et al. 2011; Osaka et al. 2015). In this thesis we aim to examine multiple participants’ brain hemodynamics while they engage with a cooperative Raven’s matrices task which requires them to combine and coordinate the information they individually posses to correctly solve the given puzzle. We will use NIRS (Near-infrared spectroscopy) hyperscanning to observe the brain hemodynamics of two participants simultaneously while they are engaged with a fluid intelligence task organized in a jigsaw format. Machine learning techniques will be employed to extract patterns from raw neuroimaging data in terms of brain-to-brain connectivity patterns in the prefrontal cortex to predict the level of success. We expect to observe increased coherence in the partners’ prefrontal cortices during successful trials. Through this study we aim to contribute to the literature with new findings on brain-to-brain correlates of social interaction.

Announcement Category

Thesis defense - Alaz Aydın

Graduate School of Informatics /Cognitive Sciences

In partial fulfillment of the requirements for the degree of Master of Science Alaz Aydın will defend his thesis.

Title: CORTICAL PROCESSES UNDERLYING METACONTRAST MASKING ACROSS DIFFERENT CONTRAST POLARITIES

Date: 31st August 2018

Time: 14:00 PM

Place: A-108

Thesis Abstract :In this study a metacontrast masking experiment is conducted together with electroencephalography (EEG) recordings in order to investigate the neural mechanisms underlying visual masking phenomena. We employed a feature-based detection task under same and opposite target-mask contrast polarity conditions, together with varying onset asynchronies. Behavioral experiments resulted in unimodal type- A and B backward masking functions for opposite and same contrast polarity conditions, respectively. Relying on this difference as an indication of non-identical neural mechanisms we collected EEG data for an exploratory analysis.

Announcement Category

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