1,720,968 research outputs found
A Systematic Approach to the Analysis of Barriers and Drivers of the ESCO Market in Turkey
No full textyanmaz, ozgur/0000-0002-6515-4911; Asan, Umut/0000-0002-0838-1421; Kadaifci, Cigdem/0000-0001-6900-5238; BOZDAG, CAFER ERHAN/0000-0003-4522-9071This chapter suggests a new systematic approach to analyze the barriers and drivers of energy service contracting. In order to identify the key barriers, the proposed approach examines both direct and indirect causal relationships among barriers and allows a systematic analysis of the actors' roles in influencing the market's development. To justify the effectiveness and applicability of the proposed approach, a case is provided where the energy service contracting market in Turkey is examined
An improved fuzzy cognitive mapping method
No full textKadaifçi, Çiğdem (Dogus Author) -- Conference full title: International Conference on Intelligent and Fuzzy Systems, INFUS 2019; Istanbul; Turkey; 23 July 2019 through 25 July 2019.Fuzzy Cognitive Mapping (FCM) models the evolution of a system over time. However, FCM tends to produce the same steady state values under different initial conditions. To address this issue, this study suggests an improved FCM method that integrates the reachability matrix of the classical Cognitive Mapping method into FCM. The proposed method produces more distinctive and representative steady state values by appropriately incorporating the initial conditions. The applicability and effectiveness of the improved method are shown by an example
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Determination of planogram compliance with image processing techniques
No full textThesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2020Tez (Yüksek Lisans)-- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2020Planogramlar perakende mağazalarında ürünlerin ideal raf dizilimlerini ve yerleşim planını belirleyen modellerdir. Ürünlerin planograma uygun olarak dizilmesi perakende mağazasının karlılığına ve gelirine pozitif etki yapmaktadır. Bu planogramlar, pek çok analist ve stratejistin kullanıcı deneyimleri, insan psikolojisi, tüketici alışkanlıkları, satış istatistikleri ve buna benzer pek çok faktörü değerlendirmesi sonucunda oluşturulmaktadır. Örneğin bir mağazada şekerleme reyonunun kasaya yakın tutulması, promosyonlu ürünlerin dikkat çekici afişlerle vurgulanması bu planogram çalışmasının bir parçasıdır. Pek çok mağaza bir planograma bağlı olarak raf yerleşimlerini yapmaktadır. Fakat mağazalarda planograma uygun olarak dizilen ve yerleştirilen ürünlerin zaman içinde dizilimi bozulmakta ve ürünler düzen dışına çıkmaktadır. Buna müşterilerin inceledikleri ürünü aldıkları yere geri bırakmaması, ürünün stoğunun bitmesi veya raftaki ürünlerin düşmesi ya da yönünün değişmesi gibi pek çok faktör sebep olabilmektedir. Tüm bu sebeplerden kaynaklı planogram bozulmasının takibini çoğunlukla mağaza personeli yapmaktadır. Bu oldukça maliyetli bir iştir. Çoğu mağazada, mağaza personelinin müşterilere ve mağazanın işlerine ayırdığı zamanın dışında ek olarak bu sorumluluğu üstlenmesi gerekmektedir. Personeller önce tüm raflara ait planogramları bulduktan sonra bu planogramları referans alarak mağazadaki rafları tek tek tarayıp uyumsuzluk olup olmadığını tespit etmeye çalışmaktadır. Mağazadaki raf ve ürün sayısı göz önünde bulundurulduğunda ne denli zahmetli ve hataya açık bir iş olduğu aşikardır. Günümüzde görüntü elde etme imkanları oldukça yaygınlaşmış ve pek çok cihazın içine kamera ya da fotoğraf makinesi yerleştirilebilir hale gelmiştir. Ayrıca artık neredeyse herkesin cebinde fotoğraf çekebilme ve video kaydedebilme özellikli akıllı telefonlar bulunmaktadır. Raf görüntülerinin belirli periyotlarla bu cihazlar aracılığı ile alınıp kaydedildiği ve bu görüntüler üzerinde görüntü işleme teknikleri ile raflardaki ürünlerin ve konumlarının tespit edilebildiği bir sistem planogram uyumluluğunun insan gücü olmaksızın teknoloji odaklı tespit edilmesini sağlayacaktır. Görüntü işleme teknikleri ve makine öğrenmesi algoritmalarının iç içe kullanıldığı bilgisayarlı görüntü analizlerinde yüksek başarı oranı ile nesne tanıma çalışmaları yapılabilmektedir. Bu çalışmada, mağazadan elde edilen referans planogram, mağazada anlık gözlemlenen raf görüntüleri ve rafta yer alan ürünlerin tekli referans görüntüleri kullanılarak, görüntü işleme teknikleri yardımıyla planogram uyumluluğunun tespiti üzerine bir sistem geliştirilmeye çalışılmıştır. Planogramdaki ve gözlenen raflardakiürünler görüntü işleme teknikleri yardımıyla, SIFT ve SURF öznitelik eşleştirme yöntemleri ile tespit edilerek ve bu tespit edilen ürünlerin birbirleri ile oluşturdukları komşuluk matrisleri kullanılarak planogram uyumluluğu tespit edilmeye çalışılmıştır. Planogram uyumluluğunun teknoloji odaklı bir yöntemle tespit edilmesiyle perakende mağazalarında verimlilik artışı sağlanması hedeflenmektedir. Mağaza personellerinin asıl sorumluluğunun yanında takip etmeye çalıştığı planogram uyumluluğu teknoloji yardımıyla tespit edildiğinde, personeller müşterilere daha fazla vakit ayırıp asıl sorumluluklarına odaklanabileceklerdir. Bunun yanında planogram uyumluluğu da insan takibine kıyasla daha yüksek bir doğruluk oranıyla ve düşük maliyetle takip edilebilecektir.Planograms are models that determine the ideal shelf arrangement and layout of products in retail stores. Arrangement of products in accordance with the planogram has a positive effect on the profitability and income of the retail store. These planograms are created as a result of many analysts and strategists evaluating user experiences, human psychology, consumer habits, sales statistics and many other factors. For example, keeping the candy aisle close to the counter in a store and emphasizing promotional products with remarkable posters are part of this planogram study. Many retailer make shelf layouts depending on a planogram. However, the products arranged and placed in stores in accordance with the planogram are disordered over time and the products go out of order. This can be caused by a number of factors, such as customers failure to return the product they are examining to, where the product has run out of stock, or if products on the shelf have fallen or changed direction. All these reasons are mostly monitored by store personnel. This is quite costly. In most stores, store personnel are additionally required to take on this responsibility beyond the time they devote to customers and the work of the store. First of all, the personnel find the planograms of the shelves and then try to find out if there is any inconsistency by scanning these shelves one by one. Considering the number of shelves and products in the store, it is obvious how troublesome and errorprone this job is. Nowadays, the possibilities of image acquisition have become widespread and camera can be placed in many devices. In addition, smartphones are now available in almost everyone's pocket for taking photos and recording videos. Thus, a system that is able to take and record shelf images by such devices at certain periods and process these images by image processing techniques to detect products and their positions on the shelves will allow automatic planogram compliance checking without manpower. In computer vision systems where image processing techniques and machine learning algorithms are nested, object recognition studies can be performed with high success rate. In this study, a system is being developed to determine the planogram compliance. The system, involving image processing techniques, uses reference planograms, shelf images observed in the store and single reference images of the products on the shelf. With the help of image processing techniques, the products in the planogram and the observed shelves were determined by SIFT and SURF attribute matching methods and the planogram compatibility was tried to be determined by using adjacent matrices created by these determined products. By determining the compatibility of planogram with a technology-oriented method, it is aimed to increase productivity in retail stores. When the planogram compatibility that the store staff tries to follow besides its main responsibility is determined with the help of technology, the staff will be able to devote more time to the customers and focus on their main responsibilities. In addition, planogram compatibility can be followed with higher accuracy and lower costs compared to human tracking. In this study, a system capable of determining planogram compatibility for the shelves in retail stores has been developed by making use of only reference planogram, observed shelf image and a model image information for each product. It is an important achievement that such a study can be done with the image processing techniques used in the system without requiring a large amount of data. In studies using deep learning techniques such as CNN used in object recognition systems, although the high success rate is generally achieved, the amount of data needed to start the study is very large and this large data set requires the tagging effort to include the test classes that are intended to be classified, so that it can be wider to use this method. it requires time and more effort. The thesis study consists of five sections. In the introduction section, which is the first part of the thesis, a detailed definition of the problem that is the subject of the thesis study has been made. The purpose of the study is mentioned and the feasibility and cost of the solution that can be developed for the problem are mentioned. In the literature research section, which is the second part of the thesis, the concept of planogram is examined and its purpose and gains and planogram compatibility are discussed. In other words, the importance and components of planogram compatibility are mentioned and what problems can be contributed to the solution of retail stores. In addition, the difficulties in the implementation of the planogram are explained and the suggestions about the solutions that can be developed are mentioned. The methods and algorithms used in image processing and computer imaging techniques are mentioned in detail. Object recognition algorithms used in image processing are expected to give different results depending on factors such as the quality of the images, the light of the environment, and the differences in perspective of the images to be compared. In order to reduce the error detection scenarios related to these factors, the algorithm that works best with the conditions of the situation should be selected. By using normalization processes such as filtering of noises other than the products sought in the images used as inputs, it may positively affect the stability and success rate of the system. In the third part of the thesis, the methods used for product recognition on store shelves are mentioned. The algorithm details of each method are mentioned. The methods were compared with each other and the pros and cons were evaluated. In the fourth section of the thesis proposed method, the solution tried to be developed in order to ensure planogram compatibility is mentioned. The steps of the designed method are explained in detail, and a flow diagram summarizing the system's operation is presented. In the experimental study and results section, which is the fifth section of the thesis, the details and results of the application designed using the method detailed in the third section are mentioned. In the experimental study, planogram and shelf compatibility were tried to be determined by using image processing techniques. The location of the products was determined on the images taken under appropriate conditions and neighborhood matrices were calculated. By comparing the neighbor matrices of the rack and planogram, planogram compliance or incompliance was determined. In the last section of study, further researches and possible improvement has been mentioned. The determination of planogram compliance with the help of technology will have direct effects such as more efficient use of human resources and cost savings in stores and markets that work with the rack layout. By maintaining planogram compliance, its indirect effect on sales will be better measurable.Yüksek LisansM.Sc
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Comperative Analysis Of Individual And Group Decision Making In Terms Of Cognitive Biases And Heuristics
No full textTez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2013Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2013Klasik karar modellerinde, insan faydasını en üst düzeye çıkartmaya çabalayan, rasyonel bir varlık olarak kabul edilmiştir. Ancak daha sonra yapılan disiplinler arası çalışmalarla birlikte rasyonel insan modelinin gerçek hayattaki karar süreçlerini açıklamadığı görülmüştür. Özellikle risk ve belirsizlik altındaki karar süreçlerinde rasyonel insan modeli verilen kararları açıklamakta yetersiz kalmaktadır. Karar süreçlerinde klasik karar modelleri varsayımlarının ihlal edildiği farklı çalışmalarla ortaya konmuştur. Sınırlı rasyonellik kavramı ile insanın bilişsel ve bilgi kapasitesinden dolayı sınırlı rasyonel olduğu kabul edilmiştir. Daha sonra yapılan çalışmalarla davranışsal karar verme yaklaşımı öne sürülmüştür. Bu yaklaşıma göre, insanların rasyonelliği sınırsız değildir. İnsanlar karar verme sürecinde bazı sezgisel kurallar kullanabilir, duygularının ve ruh hallerinin etkisinde kalabilir ve yanılgıya düşebilir. Dolayısıyla insanlar karar verme sürecinde bazı sistematik hatalar yapabilir ve rasyonel davranış kalıplarından sapmalar gösterebilir. Geleneksel karar sürecinde insanın beklenen faydayı maksimize edecek yönde karar alması beklenir, davranışşal karar verme ise insanların davranış biçimlerini ve karar süreçlerini gözlemler ve daha sonra bunları açıklayabilecek karar modelini geliştirir. Her insanın kendine özgü bir karar modeli vardır. Davranışsal karar verme alanında yapılan çalışmalarda insanların karar verirken rasyonellikten uzaklaştıran bazı bilişsel yanılma eğilimlerinin olduğu tespit edilmiştir. Bu çalışmanın amacı birey kararlarında yanılgılara sebep olan bilişsel yanılma eğilimlerinin grup kararlarına olan etkisinin incelenmesi ve birey ve grup kararları arasındaki farklılığın araştırılmasıdır. Aileden, şirket yönetimine kadar toplumun her biriminde bir çok önemli karar gruplar tarafından alınmaktadır. Bilgi birikimlerin paylaşılması ve grup içi tartışma ve etkileşimin olması grup kararlarda farklılık oluşturabilir.Literatürde birey ve grup kararları arasında farklılığı içeren çalışmalar araştırılmıştır. Yapılan deneysel çalışmalar sonucunda bazıları anlamlı bir farklılık olduğuna dair kanıt bulurken, bazı çalışmalarda birey grup kararları arasında fark olmadığı sonucuna varılmıştır. Literatürde yer alan ve bireylerin yanılma eğilimlerini ortaya koyan sorulara benzer yapıda sorular oluşturulmuştur. Çerçeve ve demirleme etkisi, temsil etme ve ulaşılabilirlik buluşsallarının birey ve grup kararları üzerinde etkisini incelenmiştir. Literatürde yer alan çalışmalar uygulamada genellikle tek eğilime odaklanırken, bu çalışma birden fazla eğilimi incelemektedir. Literatürde yer alan deneysel yaklaşımlar incelenmiş ve uygun bir yaklaşım önerilmiştir. Uygulama İstanbul Teknik Üniveristesi Endüstri Mühendisliği bölümü lisans, yüksek lisans ve doktora öğrencileri arasında yapılmıştır. Demografik özelliklerin verilen kararları etkilemediği kabul edilmiştir. Çalışma ilk önce bireylere, bir hafta sonra üçer kişilik gruplara uygulanmıştır. Birey çalışmasına 80 kişi grup çalışmasına 28 grup katılmıştır. Verilerin düzenlenmesi için tanımlayıcı istatistik yöntemleri kullanılmıştır. Veri toplama açaşamasından sonra her bir problem için uygun istatistiksel analiz yöntemi seçilmiştir. Demirleme etkisi varyans analizi sonucunda birey ve grup kararlarının ve demirleme etkisinin olup olmamasının anlamlı bir farklılık oluşturduğu görülmüştür. Ayrıca karar türü (birey/grup) ve demirlemenin etkileşimli etkisininde anlamlı olduğu diğer bir sonuçtur. Çerçeve etkisi, ulaşılabilirlik ve temsil etme buluşsalları için birey ve grup kararları arasında anlamlı bir farklılık olmadığı sonucu çıkmıştır. Bu deneyin sonuçları deneye özgü olup farklı koşullarda ve farklı kişilere sorularak farklı sonuçlar elde edilebilir. Çalışmada incelenen dört farklı bilişsel yanılma eğiliminden birey ve grup kararları arasında anlamlı farklılık oluşturan sadece demirleme eğilimi olduğu görülmüştür. Çerçeve etkisi, ulaşılabilirlik ve temsil etme buluşsallarının birey ve gruplarda benzer yanılgılara sebep olduğu sonucu varılmıştır. Gelecek araştırmalarında her bir bireyin birey kararı ve daha sonra yer aldığı grubun kararı karşılaştırılabilir. Birey kararlarının, grup içi kararlarda hangi yönde değiştiği incelebilir. Karar farklılıklarının sebepleri bilgi paylaşımı, grup içi etkileşim, grup içi kutuplaşma ve grup içi baskınlık gibi özellikler doğrultusunda araştırılabilir.In classical decision models, a person is accepted as a rational creature who tries to maximize the benefit. But, after the interdisciplinary studies, it was understood that this kind of rational person model does not match the real world situations. Especially, the rational person model is incapable. It is asserted with different studies that in the decision processes, the assumptions of the classical decision models are violated. With bounded rationality concept, it was accepted that a person is bounded rational because of his/her cognitive information capacity. In the further studies, behavioral decision making approach was brought forward. According to this approach, the rationality of human being is not unlimited. Human beings use some kind of heuristics and biases; and they may be under the influence of his/her emotions and different moods. Consequently, they could make some kind of systematical mistakes and show some deviations from the rational behavioral pattern. In classical decision making process, it is expected that the human being will choose the decision that causes the maximum benefit. On the other hand, behavioral decision making first observes the behavior pattern, and then develops a model that explains these patterns. Each human being has his/her own decision model. So, behavioral decision making model is interested in how human beings move. .In studies about behavioral decision making, it is confirmed that there are some tendencies which keeps the person from being rational. To put forward these tendencies, some kind of multiple-choice questions were asked to the people. It is confirmed that, people has a reference point when they move, how the event is presented effects the decisions of people, and they move according to what they had in their mind before. In the studies, it is put forward that people show different kind of tendency patterns such as framing effect, anchoring effect, availability heuristic and representativeness heuristic. The main purpose of this study is to investigate how the mentioned effects and heuristics that cause delusion in personal decisions, affects the group decision; and whether if there is a difference between personal decisions and group decision. From the family issues to the business decisions, a lot of important decision is taken by group. Does being interactive and discussable together with having lots of knowledge and experience prevent the group from delusion? In literature, the differences between the personal and group decisions investigated. As a consequent of these experimental studies, some of them found evidences that there is significant differences. On the other hand, in some studies the point is “there is no significant difference between these two.” In our experiment, similar questions that has similar structure with literature were constructed. Besides, framing and anchoring effect, and availability and representativeness heuristic on personal and group decisions were investigated. While the studies in literature generally give information only on one bias , our study includes more than one bias/tendency. The questions which include some kind of bias keeping people away from the rationality were applied, firstly personally then on groups. Because there is no certain answers of some biases like yes/no, and because these kind of questions tested people’s preferences and tendencies, and people can be tested according to the consistency of their preferences , bilateral questions were constructed. For framing effect, there were two questions; one of them was presented in a positive manner and the other one was in negative manner. On the other hand, for anchoring effect, again bilateral two questions were prepared that one of them includes a ratio and the other one does not. More over bilateral two question were prepared for subjects to test their representativeness heuristic. The questions are the same but the answers are different. To test availability and representativeness heuristic there was one question for each. In the study, different kinds of application models were investigated. After that, three different models were found in literature. Asking the prepared questions firstly to individual participant and secondly to groups consisting three members was selected as a model. H0 and H1 hypothesis was constructed for each bias. Whereas H0 is there is no difference between individual and group decision, H1 is there is difference between individual and group decision. The prepared test was applied on undergraduate, master and doctorate degree student of Istanbul Technical University. It is assumed that demographical properties don’t effect decisions. Prepared questions were asked firstly to individuals. A week later they were asked to groups consisting three members. Eighty people attended to individual application and twenty-eight groups to group application. In study, gathering required information took three weeks. Because, there were bilateral questions in both applications, the study consists of two phases. In first phase; there are some questions related with demographical properties and the three questions of the first phase. The papers of the participants who end up the application were taken and it was passed to the second phase. In both phases, names of the participants were taken. To prepare and arrange the data, descriptive statistical methods and graphics were used. For each bias, percentage of the answers of both individual and groups were demonstrated on graphics. Besides, the questions placed in study were compared to the questions placed in literature. By that way, the power of reflection of constructed questions was showed. With the framing effect; it was demonstrated that preferences of participants may change when the questions asked in different manners like positive-negative, win-lose, life-death. While individual who faced with –gain- exhibit risk averse attitude, the individual who faced with -loose- behaved as risk-taker.In anchoring effect, it was monitored that the median values of two question that includes percentage and does not include percentage, were different from each other. Among bilateral questions, only mental accounting question did not reflect the bias. It was expected that decision maker makes his/her decision based on a reference point while s/he gives a decision that include different options and also s/he chooses different preferences for same amount of loses. Decisions of individuals didn’t work in that way. For the availability heuristic, participants showed tendency to select the answer that comes to the mind first and known as deluded. Representativeness heuristic was inspected under two subtitle. After data collection phase, appropriate statistical analysis method was selected. As a result of anchoring effect and analysis of variance, it was seen that personal or group decisions, and having anchoring effect or not caused a significant difference on given decisions. Besides, it is another result that the decision type (personal/ group) and the interactive influence of anchoring is meaningful. According to the results, framing effect doesn’t have a meaningful difference on personal or group decisions. Therefore, H0 hypothesis couldn’t be refused. Rather than personal or group decisions, positive or negative presentation of the questions influences the decisions. It was indicated that groups have similar tendencies with the person. Mental accounting question didn’t have a meaningful difference on personal or group decisions. This question couldn’t explain the tendency as seen on the dual answers of personal participants. Availability bias question didn’t have a meaningful difference on personal or group decisions, either. H0 hypothesis couldn’t be rejected. On two different questions that evaluate representativeness bias, H0 hypothesis couldn’t be rejected. It results in that there is no significant difference between personal or group decisions. The consequences of the experiment is specifical. Different results can be handled with different circumstances and different people. Among the four affect and heuristics inspected in this study, the anchoring tendency has significant difference between personal and group decisions. It is demonstrated that framing tendency, availability tendency and representative tendency may cause similar delusions. By the analysis of descriptive statistics methods, it was identified that there is little difference in group decisions compared to personal decisions. However, these differences weren’t meaningful as statistically. One reason for this may be that sample size is limited. On the application of this study predecided person insists on the decision that s/he has taken beforehand as s/he participated on the group discussion with his/her own truth. On the experiential work, as the method was applied simultaneously on unpredecided and predecided groups, the given decisions may be different. Not having a week between the group and personal experimental studies, making group study just after personal application may cause different results in personal or group decisions. To summarize, the change of the participant profile in application like academician or worker, the different selection of the experimental method and the duration between the applications may result in the supporting evidence for the difference of personal or group decisions. According to the results of the study, group decisions doesn’t guarantee that group decisions isn’t deluded compared to the personal decisions. To pass on the group decision duration from the personal decision duration cannot be taken alone as a precaution. It the further studies, the decisions of each of person and the group that the person is in may be compared, how personal decisions change in a group may also be investigated. The reasons of the changes in decisions may be investigated in accordance with information sharing, synergy, polarization in group and dominance in group.Yüksek LisansM.Sc
Future Oriented Positioning Analysis With Bayesian Networks: An Application In Game Consoles Market
Get PDFTez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2012Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2012Bu çalışma kapsamında mevcut konumlandırma analizi tekniklerinin zayıf yönleri dikkate alınmış ve müşteri algılarının ölçülmesinde dış etkenlerin de dikkate alındığı olasılığa dayalı bir yaklaşım ortaya koyulmuştur. Yöntem olarak kullanılan Bayes Ağları ile oyun konsolları sektörüne yönelik kavramsal bir model kurulmuş ve çeşitli uzman görüşlerine bağlı olarak model geliştirilmiştir. Geliştirilen modelde kullanılacak veriler anket yolu ile toplanmış, ortaya koyulan nihai model ve veriler Bayes Ağları ile modellemede kullanılan Netica programına aktarılmıştır. Ardından farklı senaryolar oluşturularak bu senaryolar için model çalıştırılmış ve ele edilen sonuçlar karşılaştırılmıştır. Senaryo analizlerinin yanı sıra model içerisinden seçilen değişkenler için duyarlılık analizleri yapılarak sonuçlar incelenmiştir. Kurulan modelin geçerliliği ve doğruluğuna yönelik irdelemelerin ardından son olarak yapılan çalışmalar ve elde edilen sonuçlara bağlı olarak çalışmanın ilgi alanına katkıları, eksik kalan yönleri ve geleceğe yönelik yapılabilecek yeni çalışma önerileri ortaya konmuştur.In this study, the weak aspects of current positioning analysis methods are taken into account and a probabilistic approach, that takes external factors into consideration while evaluating customer perceptions, is suggested. A conceptual model is created about game consoles industry by using the method of Bayesian Networks. Then, the model is developed by expert opinions and surveys are prepared to collect data to use in the developed model. After the data is collected via surveys, the final developed model and data are inserted in Netica, a program that is used for modeling with Bayesian Networks. Following to this, different scenarios are developed and results that are obtained by running the model for those scenarios are compared. Besides scenario analysis, sensitivity analysis are performed for variables selected from the model and the results are examined. Then the validity of the model is examined. Finally, according to the results of those analysis, the contributions, implications and deficient aspects of this study for that domain are indicated and further research suggestions are made.Yüksek LisansM.Sc
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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