
Sadi Evren SekerIstanbul University · Department of Computer Engineering
Sadi Evren Seker
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About
73
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Introduction
Additional affiliations
Education
July 2005 - July 2010
July 2002 - July 2004
July 2000 - July 2003
Publications
Publications (73)
The aim of this study is the computerization of the argument Delphi method. The Delphi method is mainly designed for qualitative prediction within a group of experts, where the experts make predictions and a facilitator controls these predictions until the experts end up with a level of consensus. Argument Delphi, as opposed to the classical Delphi...
Collecting observations from all international news coverage and using TABARI software to code events, the Global Database of Event, Language, and Tone (GDELT) is the only global political georeferenced event dataset with 250+ million observations covering all countries in the world from January 1, 1979 to the present with daily updates. The purpos...
This study focuses on the possible extensions of current temporal logics. Four extensions are proposed in this study which are self referring events, non-existing events, multiple recurrence of events and an improvement on anterior past events. Each of these extensions are on different levels of the temporal logics. The main motivation behind the e...
Although employment web sites have recently become the main source for re- cruitment and selection process, the relation between those sites and unemploy- ment rates is seldom addressed. Deriving data from 32 countries and 427 web sites, this study explores the correlation between unemployment rates of European countries and the attractiveness of c...
This study aims to publish a novel similarity metric to increase the speed of comparison operations. Also the new metric is suitable for distance-based operations among strings.
Most of the simple calculation methods, such as string length are fast to calculate but doesn’t represent the string correctly. On the other hand the methods like keeping...
In the present era, where competition pervades across all domains, profitability holds crucial economic importance for numerous companies, including the banking industry. Offering the right products to customers is a fundamental problem that directly affects banks’ net revenue. Machine learning (ML) approaches can address this issue using customer...
This study, investigates the goal setting and goal optimization using machine learning techniques. Goal setting assesses whether a goal is achievable; if so, it helps define the main goals, sub-goals, and establish a plan. During the study, we analyzed a three-year sales dataset and predicted prices that would achieve a 20% revenue increase goal fo...
Setting targets for the bank branches and distribution of annual targets to the branches and portfolio managers, quarterly, is a crucial process for decision making and strategic planning in the banking industry. Performance of the bank branches and portfolio managers are also evaluated by the quarterly divided targets to the branches and portfolio...
Mechanical excavators are widely used in mining, tunneling and civil engineering projects. There are several types of mechanical excavators, such as a roadheader, tunnel boring machine and impact hammer. This is because these tools can bring productivity to the project quickly, accurately and safely. Among these, roadheaders have some advantages li...
Various mechanical excavation systems such as roadheaders, tunnel boring machines (TBM), and impact hammers, are commonly used in mining, tunneling, and civil engineering projects. However, in recent years, the application of impact hammers in hard rock excavation has been on the rise, especially in fractured geological formations. Impact hammers o...
This paper is mainly about the digital reputation of universities, the correlation between the productivity of the universities and the reputation of the knowledge produced in the universities. Paper starts with the affect of social media and other web 2.0 entities on the universities and education. In the second part the difficulty of measuring kn...
This paper proposes an overview of macroeconomic correlation between telecom investments and the GDP of MINT countries. MINT countries are Mexico, Indonesia, Nigeria and Turkey and the term has populated by Goldman Sachs, who has also created a relatively more referred term BRICS. The paper holds a specialized literature for each of MINT countries...
A number of security protocols have been designed for mobile transactions using Near Field Communication technology in the last few years. However, the component architectures of these protocols are rarely implemented in Java for further evaluation. In this paper, we briefly discuss our previously proposed mobile transaction authentication protocol...
This paper is an output of data science study on a real life problem. The paper starts with the problem definition and a brief introduction to the mobile advertisement for addressing the machine learning problems. Later on, some machine learning solutions are provided for each of the problems, furthermore the success of classical solution methods i...
Anomaly detection refers to the identification of patterns in a dataset that do not conform to expected patterns. Such non‐conformant patterns typically correspond to samples of interest and are assigned to different labels in different domains, such as outliers, anomalies, exceptions, and malware. A daunting challenge is to detect anomalies in rap...
This study has three major outcomes, the first major outcome of the research is the comparison of countries in Balkan region by some characteristic differences between the mobile phone users, market structures and profitability of mobile operators. The second major outcome is the normalization of mobile operator actions and comparing different oper...
The aim of this study is an actual foresight analysis of Information Valley in Turkey and its social analysis through scientific methodologies and interpretation of its outcomes. Computerized Argument Delphi method has been utilized in order to collect the information from social networks with crowd sourcing approach. The method also supplies the d...
The Global Database of Event, Language, and Tone (GDELT) is the only global political georeferenced event dataset with more than 250 million observations covering all countries in the world since January 1, 1979. TABARI and CAMEO are the tools that are used to collect and code events from all international news coverage. To query such big geospatia...
İçindekiler
Yönetim Bilişim Sistemleri için yeni bir İstatistiksel Bilgi Yönetimi Modeli syf. 1 - 9
Büyük Veri ve Büyük Veri Yaşam Döngüleri (Big Data and Big Data Life Cycles), syf. 10 - 17
Yazılım Geliştirme Modelleri ve Sistem/Yazılım Yaşam Döngüsü (SDLC), syf 18 - 29
Metin Madenciliği (Text Mining), syf. 30 - 32
Digital world is transforming wares to soft-wares, business to e-business, brick and mortar companies to online companies. With its exponentially increasing nature the transformation is continuing. One crucial value of any company, which is interrelated with all the sub divisions and operations of the company, can be considered as its reputation. T...
Aim of this study is researching the web based reputation index of most prestigious companies quoted in the Istanbul stock market, first time. The web reputation is gathered through the 12 different parameters, collected from Google, Facebook, Twitter, Bing, Alexa, etc. All the parameters are normalized by min-max method to achieve a common value r...
Küreselleşen dünyada yaşanan ekonomik ile teknolojik gelişmeler aracılığıyla firmaların yapılarında köklü değişimleroluşmaktadır. Belirtilen gelişmeler doğrultusunda tüm bilim dallarında olduğu gibi muhasebe bilimi ve alanında da ciddideğişimler görülmektedir. Belirtilen durum hiç kuşkusuz muhasebe eğitimi için de söz konusu olmakta ve eğitiminfark...
Streaming data is one of the attention receiving sources for concept-evolution studies. When a new class occurs in the data stream it can be considered as a new concept and so the concept-evolution. One attractive problem occurring in the concept-evolution studies is the recurring classes from our previous study. In data streams, a class can disapp...
Küreselleşen dünyada yaşanan ekonomik ile teknolojik gelişmeler aracılığıyla firmaların yapılarında köklü değişimler oluşmaktadır. Belirtilen gelişmeler doğrultusunda tüm bilim dallarında olduğu gibi muhasebe bilimi ve alanında da ciddi değişimler görülmektedir. Belirtilen durum hiç kuşkusuz muhasebe eğitimi için de söz konusu olmakta ve eğitimin f...
In this study, we have studied a case of two leading insurance company merger, which are Aviva and Ak insurance companies operating in Turkey. The company merger case is studied according to the human resource management (HRM) approach. During the study, the HRM perspective of merger is based on the interviews by C-level executives and many HRM rel...
The ICT industry has been the driver for economic growth for several years before the financial crisis. The purpose of the paper is to look at the effects of last financial crisis on the ICT industry and how this macroeconomic shock was transmitted to households. Since the cost of capital became much higher, this weakened the long-term growth of co...
Internet is a well, organized technological achievement of human being and a rapidly improving medium through time. All the novel technological achievements like web 2.0 or web 3.0 are new epochs of Internet technology and Internet is spreading in multiple dimensions, reforming the paradigm, and innovating the technology in a self-renewing fashion....
This research investigates the relationship between intellectual capital and web trends of the index bist-304 from an accounting viewpoint. As well known, bist-30 is comprised of top 30 firms listed in Istanbul Stock Exchange. The trends of web pages and firms are analyzed using specific web means such as the Google Trends. In addition, Market Valu...
Internet is causing paradigm shifts on almost every aspects of the life. One major paradigm shift also occurs on the strategic competition field. The new strategic competition is studied based on Porter’s value chain analysis and Internet can be considered as a technological improvement on the information and communication technology, which can als...
This research conducts the web statistics of the employment web sites with the technological impact on the macroeconomics. The statistical information gathered from web-o-metrics of the Caucasus region job seeking web sites like the number of visitors, Facebook likes or shares, twitter messages about web site, number of back links counted by google...
The aim of this study is to factorize semi-prime numbers which are multiplication of two primes and primarily used in RSA encryption method. In this article, commonly used factorization methods are introduced and their performance are compared. A new method of factorization is proposed. Also the success of the new proposed method is tested by testi...
By the increasing spread of information technology and Internet improvements, most of the large-scale companies are paying special attention to their reputation on many types of the information and communication technology. The increasing developments and penetration of new technologies into daily life, brings out paradigm shift on the perception o...
This research investigates the relationship between intellectual capital and web trends of the index bist-30 from an accounting viewpoint. As well known, bist-30 is comprised of top 30 firms listed in Istanbul Stock Exchange. The trends of web pages and firm are analyzed using specific web means such as the Google Trends. In addition, Market Value...
University libraries are, more than ever, confronting to allocate their resources in more efficient and productive ways. On the one hand, they try to diversify their options to have rich collections; on the other hand, they challenge the risk of purchasing expensive, repetitive and outdated service, which creates a dilemma. Universities and researc...
The aim of this study is to provide information about barter transactions of firms, which operate in Turkey and are members of the barter system. In this context, especially transactions concerning the purchase and sale of goods and services are analyzed. As it is well known, barter transactions are used for decades and rooted for centuries. Before...
ZET Yapmış olduğumuz bu çalışmanın amacı, Türkiye'de faaliyetlerini sürdürmekte olan barter sistemine üye işletmelerin mal ve hizmet alım satım işlemlerini gerçekleştirmede kullandıkları takas işlemleri ile ilgili bilgiler aktarmaktır. Bilindiği üzere, takas işlemleri yüzyıllar öncesine dayanmaktadır. Para icad olmadan önce insanlar, ihtiyaçlarını...
Yapmış olduğumuz bu çalışmanın amacı, Türkiye’de faaliyetlerini sürdürmekte olanbarter sistemine üye işletmelerin mal ve hizmet alım satım işlemlerini gerçekleştirmede kullandıkları takas işlemleri ile ilgili bilgiler aktarmaktır. Bilindiği üzere, takas işlemleriyüzyıllar öncesine dayanmaktadır. Para icad olmadan önce insanlar, ihtiyaçlarınıürettik...
This study focuses on the correlation between intellectual capital and web trends of the index bist-30 , which holds the top 30 companies in Istanbul Stock Market (BIST). Main trends of web sites and companies are collected separately via web tools. Also, intellectual capital is studied and measured based on two methods, which are Market Value / Bo...
Internet is a well, organized technological achievement of human being and a rapidly improving medium through time. All the novel technological achievements like web 2.0 or web 3.0 are new epochs of Internet technology and Internet is spreading in multiple dimensions, reforming the paradigm, and innovating the technology in a self- renewing fashion...
This paper attempts to develop an online reputation index of Turkish universities through their online impact and effectiveness. Using 16 different web based parameters and employing normalization process of the results, we have ranked websites of Turkish universities in terms of their web presence. This index is first attempt to determine the tool...
Data mining techniques on the biological analysis are spreading for most of the areas including the health care and medical information. We have applied the data mining techniques, such as KNN, SVM, MLP or decision trees over a unique dataset, which is collected from 16,380 analysis results for a year. Furthermore we have also used meta-classifiers...
This paper proposes an information retrieval method for the economy news. The effect of economy news, are researched in the word level and stock market values are considered as the ground proof.
The correlation between stock market prices and economy news is an already ad- dressed problem for most of the countries. The most well-known approach is a...
Geliş Tarihi: 13 Mayıs 2013 Kabul Tarihi: 14 Mayıs 2014 ÖZET Bu çalışmanın amacı, öncelikli olarak RSA şifreleme yönteminde kullanılan ve iki asal sayının çarpımından oluşan yarı-asal sayıları, çarpanlara ayırmaya yöneliktir. Bu makale kapsamında sık kullanılan ve öne çıkan çarpanlara ayırma yöntemlerinin açıklanması ve performanslarının karşılaştı...
This study focuses on the correlation between intellectual capital and web trends of the index bist-30 , which holds the top 30 companies in Istanbul Stock Market (BIST). The trends of web sites and companies are collected separately via web tools. Also, intellectual capital is studied and measured based on two methods, which are Market Value / Boo...
Increasing demand on infrastructures increases attention to shallow soft ground tunneling methods in urbanized areas. Especially in metro tunnel excavations, due to their large diameters, it is important to control the surface settlements observed before and after excavation, which may cause damage to surface structures. In order to solve this prob...
Depending on the market strength and structure, it is a known fact that there is a correlation between the stock market values and the content in newspapers. The correlation increases in weak and speculative markets, while they never get reduced to zero in the strongest markets. This research focuses on the correlation between the economic news pub...
The concept of novel authors occurring in streaming data source, such as evolving social media, is an unaddressed problem up until now. Existing author attribution techniques deals with the datasets, where the total number of authors do not change in the training or the testing time of the classifiers. This study focuses on the question, “what happ...
Sentimental analysis on web-mined data has an increasing impact on most of the studies. Sentimental influence of any content on the web is one of the most curios questions by the content creators and publishers. Also the impact of the web-mined data is completely another issue than the sentiments. For example categorizing a blog post into positive...
Factorization algorithms have a major role in the computer security and cryptography. Most of the widely used crypto-graphic algorithms, like RSA, are built on the mathematical difficulty of factorization for big prime numbers. This re-search, proposes a new approach to the factorization by using two new enhancements. The new approach is also compa...
Sentimental analysis on web-mined data has an increasing impact on most of the studies. Sentimental influence of any content on the web is one of the most curios questions by the content creators and publishers. In this study, we have re-searched the impact of the comments collected from five dif-ferent web sites in Turkish with more than 2 million...
Aim of this study is applying the ensemble classification methods over the stock market closing values, which can be assumed as time series and finding out the relation between the economy news. In order to keep the study back ground clear, the majority voting method has been applied over the three classification algorithms, which are the k-nearest...
Because of the increasing studies on the big data, holding text as data source, the importance of feature hashing has a major role in the literature now. A usual way of text mining on big data, mostly requires a layer of feature hashing, which reduces the size of fea-ture vector. For example getting the word count yields hundreds of thousands of fe...
Is the concept of stock market speculations, related with the news in the news papers? This study mainly focus on the correlation between economy news from one of the highest circulation rate news paper in Turkey and Istanbul stock market closing values. Data set is collected from the web page of news paper in natural language and text mining techn...
Günümüzde bilgi teknolojileri her alanda olduğu gibi sürekli gelişen ve değişen doğası ile işletmecilik alanını da dönüşüme yöneltmektedir. Sınırların ortadan kalkması ile belirginleşen ağır ve yıkıcı bir rekabet ortamında klasik işletme işlevleri, örgüt yapıları ve yönetim teknikleri yetersiz kalmaktadır. Bu da yeni bir işletmecilik yaklaşımının o...
The modulus of elasticity of intact rock (E
i) is an important rock property that is used as an input parameter in the design stage of engineering projects such as dams, slopes, foundations, tunnel constructions and mining excavations. However, it is sometimes difficult to determine the modulus of elasticity in laboratory tests because high-quality...
Protein dataset consists of 698 objects (corresponding to protein folds) with 125 attributes. The protein dataset contains 698 proteins from 125 samples. The real clusters correspond to the four classes of protein - folds: α, β, α/β and α+β protein classes. DLBCL - B is 2 - channel custom cDNA microarray dataset. This is a B cell lymphoma dataset w...
This study aims to find a solution for the optimization of indexer and crawler modules of a search engine if the possible varieties of the search phrases are previously known as a regular expression. A search engine can be considered as an expert in any area if the search domain is narrowed and the crawling and indexing modules are optimized accord...
Purpose of this project is implementing conversational software to interface dialog based sentences between the user and a library database. This software implemented with a special expertise on library dialogs. The number of possible library dialog sentences is limited and this project covers almost all of these possible sentences. The input sente...
The aim of this study is performance evaluation of a web spider which almost all search engines utilize during the web crawling. A data structure is required to keep record of pages visited and the keywords extracted from the web site during the web crawling. The paper first goes into the detail of possible data structures for a web spider and crit...
Temporal logics are widely used in many study types, such as question answering, ontology, natural language processing, search engines, text summarization, or even visual tools like Gantt charts or UML diagrams. Computable temporal languages are the logical systems, built on temporal logic, that can be computed to find a result. They can also be de...
An intelligent natural language interface based on Turkish ,Language is designed for creating Java class skeleton, listing the class and its members. This interface is developed as a part of a project named as TUJA, a tool for producing Java programs ,using Turkish sentences. Turkish sentences are converted ,into instances of schemata, representing...