Dogus University Journal

1-13

Authors: Erdem BİLGİLİ, Osman Nuri UÇAN

Bu çalışmada beş farklı bitki yaprağı kullanılarak, çok katmanlı yapay sinir ağı geriye yayılma algoritması ile eğitilmiştir. Eğitim işleminden sonra yapay sinir ağına tanıtılan her bir yaprak türünden 15 adet yaprak görüntüsü ağa giriş olarak verilmiş ve ağın bu yaprakları sınıflandırması istenmiştir. Bu işlemden sonra eğitim işlemi sırasında kullanılmayan 6 farklı bitki türüne ait yaprak görüntülerini ağın sınıflandırması istenmiştir. Ağ daha önce tanımadığı bu desenleri , eğitim işlemi sırasında kendisine tanıtılan 5 bitki türünden birine benzetmeye çalışmıştır.

29-38

Authors: Ali DÖNMEZ

Burada bilgisayarcı bazı matematikçilerin yaşam öyküleri tanıtılacaktır.

43-58

Authors: Cudi Tuncer GÜRSOY, Yaman Ömer ERZURUMLU

This article attempts to measure performances of Type A and Type B funds relative to T-Bill rates and ISE-100 index in Turkey over the period of January 1998-June 2000 using Sharpe, Treynor, Jensen, and Graham&Harvey indices. 55 Type A, and 77 Type B Funds were included in the analysis. In order to test whether four different indices make similar ranking, Spearman rank correlation analysis was utilized. Secondly, Wilcoxon Signed-Rank test was applied to test the significance of the differences in Sharpe indices of alternative investment instruments included in the analysis. Analysis revealed that different criteria rank the portfolios similarly. But more importantly it was found that, the best investment over the entire analysis period as well as in the sub-periods was T-Bills, which was followed by ISE-100 index, Type B Funds, and Type A funds respectively. This finding makes the merits of the efforts spent by funds managers, over the analysis period, to outperform the market highly questionable.

71-90

Authors: Alövsat MÜSLÜMOV

This paper examines the premerger discrimination between acquirers and targets using a sample of 56 mergers from U.S. economy. The research findings indicate that acquirers and targets discriminate in terms of size, liquidity and cash flow dimensions, while no statistically significant discrimination are detected in terms of growth potential, past market returns and operating efficiency. The subsample studies show that diversifying mergers aim to exploit cash flow potential of targets, whereas related mergers focus on growth potential. The premerger financial properties of acquirer and targets bear informational clues about method of payment in mergers. Strategic analysis of portfolio shifts show that value acquirers aim to purchase companies with higher growth potential, whereas growth bidders aim to purchase companies with stronger cash flow record.

105-114

Authors: Hakan ŞİMŞEK, Ahmet KÜÇÜK

This paper is concerned with 810 knots and its braids. The braids structure is very important role in Knots Theory. In view of this structure, we obtained braids for that knot and we will give the representations of Artin and we examine Garside Word problem. And then we will examine the positivity structure for these knots.