351 research outputs found
Understanding US firm efficiency and its asset pricing implications
No full textWe investigate the link between firm-level total factor productivity (TFP) growth, technical efficiency change, and their implications on firm-level stock returns. We estimate total factor productivity growth of US firms between 1966 and 2015 and decompose TFP growth into returns to scale, technical progress, and technical efficiency change components. We show that most of the variation in TFP growth is explained by variation in technical efficiency change. Moreover, we examine the effects of important macro- and micro-level factors on inefficiency as well as its asset pricing implications. We find that low-efficiency firms are more vulnerable to a wide class of aggregate economic shocks, and the well-known five stock return anomalies (Fama and French in J Financ Econ 116(1):1–22, 2015) are more pronounced among those firms. Our results also emphasize the role of macroeconomic determinants of efficiency, and the stability effects of many useful policy targets on firm-level TFP
An investigation on anatomy, morphology and ecology of metazoan parasites of Cyprinus carpio L. 1758 (common carp) from lake Karamik
No full textBu tezin, veri tabanı üzerinden yayınlanma izni bulunmamaktadır. Yayınlanma izni olmayan tezlerin basılı kopyalarına Üniversite kütüphaneniz aracılığıyla (TÜBESS üzerinden) erişebilirsiniz.KARAMIK GÖLÜ (AFYONKARAHİSAR)'DEKİ CYPRINUS CARPIO L. 1758 (SAZAN)'NUN METAZOON PARAZİTLERİ ÜZERİNDE ANATOMİK, MORFOLOJİK VE EKOLOJİK BİR ARAŞTIRMA (Yüksek Lisans Tezi) HASAN LEVENT KUTLU AFYONKARAHİSAR KOCATEPE ÜNİVERSİTESİ FEN BİLİMLERİ ENSTİTÜSÜ Eylül 2005 ÖZET Bu çalışmada, 13 Mart 2004 ile 28 Mayıs 2005 tarihleri arasında Karamık Gölü (Afyonkarahisar)'nden temin edilen 71 Cyprinus carpio L.1758 (sazan)'nun metazoon parazitleri üzerinde incelemeler yapılmıştır. Konak balık türünde üç parazit tanımlanmıştır: Gyrodactylus elegans, Nordmann, 1832; Dactylogynıs extensus Mueller ve Van Cleave, 1932 (Monogenea, Plathelrnintes): Bothriocephalus acheilognathi, Yamaguti, 1934 (Cestoda, Plathelrnintes). Bu türlerden G. elegans 16 balığın yüzgeçleri (%22,5; 7,6 parazit/balık) ile 2 balığın solungaçlarında (%2S8; 5,0 parazit/balık), D. extensus 65 balığın solungaçlarında (%91,5; 22,1 parazit/balık), B. acheilognathi ise 10 balığın bağırsağında (%14,0; 10.8 parazit/balık) rastlanmıştır. Konak balıkta en çok rastlanan parazit D. extensus'tur. İlgili parazite ait en yüksek enfeksiyon oranı ve ortalama parazit sayısı kış, en düşük değerler ise ilkbahar ve yaz aylarında kaydedilmiştir. D. extensus ile enfekte olma oranı küçük boylu balıklarda büyüklere göre daha fazladır. G. elegans orta boylu sazanların yüzgeçlerinde ilkbaharda, solungaçlarında ise kış aylarında kaydedilmiştir. Bu iki parazitin dişi ve erkek sazanlar arasındaki dağılımında anlamlı bir fark yoktur. B. acheilognathi' nin küçük ve orta boydaki sazanlarda oluşturduğu enfeksiyon kış aylarında yüksek, ilkbahar ve yaz aylarında ise düşük bulunmuştur. Erkek balıklar dişilere göre B. acheilognathi ile fazla enfektedir. Anahtar Kelimeler: Bothriocephalus, Cyprinus, Dactylogyrus, Gyrodactylus, Karamık GölüAN INVESTIGATION ON ANATOMY, MORPHOLOGY AND ECOLOGY OF METAZOAN PARASITES OF CYPRINUS CARPIO L. 1758 (COMMON CARP) FROM LAKE KARAMIK (AFYONKARAHİSAR) (MSc Thesis) HASAN LEVENT KUTLU AFYONKARAHİSAR KOCATEPE UNIVERSITY GRADUATE SCHOOL OF NATURAL AND APPLIED SCffiNCES September 2005 SUMMARY In this study, the presence of metazoan parasites on 71 Cyprinus carpio L.1758 (common carp) was investigated in Lake Karamik, Afyonkarahisar, Turkey between 13 th March 2004 and 28* May 2005. Three parasite species were identified in the host fish species: Gyrodactylus elegans, Nordmann, 1 S32; Dactylogyrns extensus Mueller ve Van Cleave, 1932 (Monogenea, Plathelminthes): Bothriocephalus acheilognathi, Yamaguti, 1934 (Cestoda, Plathelminthes). From these species, G. elegans was found on the gills of 2 fish (%2.8, 5.0 parasite/fish) and on the fins of 16 fish (%22.5, 7.6 parasite/fish). Dactylogyrus extensus was found on the gills of 65 fish (%91.5, 22.1 parasite/fish). Bothriocephalus acheilognathi was found in the intesiine of 10 host fish (%14.0, 10.8 parasite/fish). D. extensus was the dominant species found on the host fish. The highest infection rate and mean parasite was in winter and minimum value was in summer and spring. The smaller common carp have more infection rate than larger common carp specimens by D. extensus. G. elegans was found on middle size fish's fins in spring, on the gills in winter. There is no meaningful difference between two parasite species in male and female common carps. The infection occurred by B. acheilognathi was more common in small and middle size host fish species in winter than in spring and summer. Male fish specimens were infected more than female fish by B. acheilognathi. Keywords: Cyprinus, Dactylogyrus, Bothriocephalus, Gyrodactylus, Lake Karamik 1
Capacity Constraint, Price Discrimination, and Oligopoly
No full textIn the presence of market power in oligopolistic environment, price discrimination is a natural phenomenon. Surprisingly this setting has not been analyzed in depth in the literature. In contrast with existing literature, e.g., Hazledine (2006) and Kutlu (2009), we consider quantity setting games where firms compete in two stages. In the first stage firms decide on the choice of capacity and in the second stage they decide on the structure of price discrimination where the level of price discrimination is exogenous. In contrast to Hazledine (2006) we find that in the Cournot framework the quantity-weighted average price depends on the level of price discrimination. We also find that in the Stackelberg framework both the leader and the follower price discriminate as opposed to Kutlu (2009) which concludes that the leader doesn't price discriminate. Moreover, it is discovered that both the players (even the follower) prefer to be in the Stackelberg framework rather than the Cournot framework when price discrimination exists. Comparing welfare under various settings, it is found that competition is not always good for the total welfare if price discrimination exists. desirable axioms.
A review of discrete solutions of poisson, laplace, and wave equations
No full textSevgi, Levent (Dogus Author)One- and two-dimensional discrete solutions of Poisson, Laplace, and wave equations are given in this tutorial. The terms wave propagation and numerical propagation are discussed. Simple MATLAB scripts are also supplied.IEEE Antennas and Propagation Societ
Measuring market power when firms price discriminate
No full text© 2017, Springer-Verlag Berlin Heidelberg. We propose conduct parameter-based market power measures within a model of price discrimination, extending work by Hazledine (Econ Lett 93:413–420, 2006) and Kutlu (Econ Lett 117:540–543, 2012) to certain forms of second-degree price discrimination. We use our model to estimate the market power of US airlines in a price discrimination environment. We find that a slightly modified version of our original theoretical measure is positively related to market concentration. Moreover, on average, market power for high-end segment is greater than that of low-end segment
Measuring market power when firms price discriminate
No full text© 2017, Springer-Verlag Berlin Heidelberg. We propose conduct parameter-based market power measures within a model of price discrimination, extending work by Hazledine (Econ Lett 93:413–420, 2006) and Kutlu (Econ Lett 117:540–543, 2012) to certain forms of second-degree price discrimination. We use our model to estimate the market power of US airlines in a price discrimination environment. We find that a slightly modified version of our original theoretical measure is positively related to market concentration. Moreover, on average, market power for high-end segment is greater than that of low-end segment
Modeling and simulation strategies in wireless propagation and coverage planning
No full textUluışık, Çağatay (Dogus Author) -- Sevgi, Levent (Dogus Author)This paper presents two-dimensional (2D) user-friendly, tailored with attractive and useful graphical user interfaces (GUI), Matlab propagation packages based on the classical knife-edge model and the parabolic equation method that can handle realistic propagation scenarios with non-flat, arbitrarily-designed and user-selected terrain profiles. Any 2D propagation scenario may be built by the user, and field vs. range and/or height profiles can be simulated
Correction to: Bearing fault detection in adjustable speed drives via self-organized operational neural networks (Electrical Engineering, (2024), 10.1007/s00202-024-02764-3)
No full textIn the original publication, the affiliation of first author has been wrongly tagged to second author of the paper. The authors and affiliations should have appeared as follows: Sertac Kilickaya1, Levent Eren21Faculty of Information Technology and Communication Sciences, Tampere University, Korkeakoulunkatu 7, 33720, Tampere, Finland 2Department of Electrical and Electronics Engineering, Izmir University of Economics, Izmir, Turkey The original article has been corrected.Non peer reviewe
A new panel data treatment for heterogeneity in time trends. Econometric Theory 28
No full textfor constructive criticisms and insights. We would also like to thank three anonymous referees and Editor Guido Kuersteiner for their insightful comments and criticisms that substantially strenghened the paper. We would also like to thank Levent Kutlu for his very crucial research assistance. The usual caveat applies. JEL Classification: C13, C14, C22, C23, D24, G21
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