A random walk method for alleviating the sparsity problem in collaborative filtering

Collaborative Filtering is one of the most widely used ap-proaches in recommendation systems which predicts user preferences by learning past user-item relationships. In re-cent years, item-oriented collaborative filtering methods came into prominence as they are more scalable compared to user-oriented methods. Item-oriented methods discover item-item relationships from the training data and use these re-lations to compute predictions. In this paper, we propose a novel item-oriented algorithm, RandomWalk Recommender, that first infers transition probabilities between items based on their similarities and models finite length random walks on the item space to compute predictions. This method is especially useful when training data is less than plentiful, namely when typical similarity measures fail to capture ac-tual relationships between items. Aside from the proposed prediction algorithm, the final transition probability matrix computed in one of the intermediate steps can be used as an item similarity matrix in typical item-oriented approaches. Thus, this paper suggests a method to enhance similarity matrices under sparse data as well. Experiments on Movie-Lens data show that RandomWalk Recommender algorithm outperforms two other item-oriented methods in different sparsity levels while having the best performance difference in sparse datasets

Evaluation of outdoor furniture designs in Antalya-Konyaaltı parks with regard to users’ preferences

Antalya kenti son on yılda turizm yatırımlarından kaynaklan nüfus artışı ile birlikte kentleşme konusunda yaşanan hızlı gelişimle bir dünya kenti olmuştur. Bu hızlı gelişim beraberinde yoğun bir kentleşme olgusunun yaşanmasına yol açmıştır. Batıya doğru kentleşmenin sonucunda ortaya çıkan yeni yerleşimlerden biri olan Konyaaltı ilçesi doğal güzellikleriyle olduğu kadar, yeni yapıları ve park alanları ile dikkat çekmektedir. Parkların vazgeçilmez ögelerinden olan donatı elemanları, faydaları ve estetik özellikleriyle bir parkın çehresini değiştirebilmektedir. Diğer taraftan donatı elemanlarının kullanıcılarla çeşitli yönlerden sürekli etkileşim halinde olduğu bir gerçektir. Bu çalışmada da Konyaaltı yerleşimi sınırları içerisinde bulunan parklarda kullanılan donatı elemanlarının, kullanıcı memnuniyeti, yapılan anketlerle saptanmaya çalışılmıştır. Anket sonuçları ışığında donatı elemanlarının parklara olan olumlu ve olumsuz katkıları belirlenmeye çalışılarak, mevcut durumun daha iyi olabilmesi konusunda öneriler getirilmiştir.Antalya has become a world known city with the rapid development in the recent years. This rapid development brings a lot of problems like density of the population and building areas. Because of this rapid development, suburban areas become urban areas such as Konyaaltı which is most significant town with its new buildings and park areas. The park furniture can be change the view of the park with its function and esthetic properties. At the other hand, it is accepted that the park furniture always interaction with user many kinds of way. In this research it is determine that the satisfaction of user from the park furniture which are in the Konyaaltı’s parks by the way of the public survey. It is tried to define their positive or negative aid to that parks. And the last it is tried to bring some offer for to remediation of the current situatio

The Evaluation of User Views of Urban Parks Outdoor Furniture Design, the Case Study of Antalya –Konyaaltı

ABSTRACTAntalya has become a world known city with the rapid development in the recent years. This rapid development brings a lot of problems like density of the population and building areas. Because of this rapid development, suburban areas become urban areas such as Konyaaltı which is most significant town with its new buildings and park areas. The park furniture can be change the view of the park with its function and esthetic properties. At the other hand, it is accepted that the park furniture always interaction with user many kinds of way. In this research it is determine that the satisfaction of user from the park furniture which are in the Konyaaltı’s city parks by the way of the public survey. It is tried to define their positive or negative aid to that parks. And the last it is tried to bring some offer for to remediation of the current situation. Keywords: Park, Outdoor Furniture, User Pleasure, Antaly

Aromatase inhibitors decrease radiation-induced lung fibrosis: Results of an experimental study

IEEE Conference on Standards for Communications and Networking, CSCN 2015 -- 28 October 2015 through 30 October 2015 -- 119154Purpose: In experimental and clinical trials, tamoxifen (TAM) has been shown to increase radiation-induced lung fibrosis (RILF). Furthermore, aromatase inhibitors (AI) have been shown to be superior to TAM in the adjuvant setting and preclinical data suggest that letrozole (LET) sensitizes breast cancer cells to ionizing radiation in other studies. In this experimental study, we evaluated whether AI have any impact on the development of RILF in rats. Materials and methods: 60 female wistar- albino rats were divided into 6 groups: Control (group A), RT alone (group B), RT + TAM (group C), RT + anastrozole (ANA group D), RT + LET (group E), and RT + exemestane (EXE, group F). RT consisted of 30 Gy in 10 fractions to both lungs with an anterior field at 2 cm depth. Equivalent doses for 60 kg adult dose per day of TAM, ANA, LET, and EXE were calculated according to the mean weight of rats and orally administrated with a feeding tube. Percentage of lung with fibrosis was quantified with image analysis of histological sections of the lung. The mean score values were calculated for each group. the significance of the differences among groups were calculated using one way ANOVA test and Tukey HSD post-hoc test. Results: Mean values of fibrosis were 1.7, 5.9, 6.7, 2.5, 2 and 2.2 for groups A, B, C, D, E, and F, respectively (p = 0.000). TAM increased RT-induced lung fibrosis but without statistical significance. Groups treated with RT + AI showed significantly less lung fibrosis than groups treated with RT alone or RT + TAM (p = 0.000). RT + AI groups showed nearly similar RT-induced lung fibrosis than control group. Conclusions: In this study, we found that AI decreased RT-induced lung fibrosis to the control group level suggesting protective effect

Kuruluşundan 1980 yılına kadar Et ve Balık Kurumu

Ankara : İhsan Doğramacı Bilkent Üniversitesi İktisadi, İdari ve Sosyal Bilimler Fakültesi, Tarih Bölümü, 2014.This work is a student project of the The Department of History, Faculty of Economics, Administrative and Social Sciences, İhsan Doğramacı Bilkent University.by Yeni, Harun