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138 results on '"Cevik B"'

23. Overview of surface measurements and spatial characterization of submicrometer particulate matter during the DISCOVER-AQ 2013 campaign in Houston, TX

Author

Leong, Y.J., primary, Sanchez, N.P., additional, Wallace, H.W., additional, Karakurt Cevik, B., additional, Hernandez, C.S., additional, Han, Y., additional, Flynn, J.H., additional, Massoli, P., additional, Floerchinger, C., additional, Fortner, E.C., additional, Herndon, S., additional, Bean, J.K., additional, Hildebrandt Ruiz, L., additional, Jeon, W., additional, Choi, Y., additional, Lefer, B., additional, and Griffin, R.J., additional

Published
2017
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27. Pricing Strategies and Protection of Digital Products Under Presence of Piracy: A Welfare Analysis

Author

Ozertan, G. and Cevik, B.

Subjects
Duopoly, Monitoring, Pricing Strategy, Software Piracy
Abstract

Based on a duopolistic set-up where firms produce software products with respective support packs, we analyze firms' pricing and predetermined monitoring decisions, as well as the impacts of these factors on welfare. In the presence of end-user piracy, users are classified as support-dependent and support-independent. First, a theoretical model is derived, but, due to its complexity, a numerical example is employed to derive the results. We observe that firms that are in competition face a menu of monitoring and pricing combinations. Our results indicate that (i) firms may use monitoring and pricing as strategic complements, rather than substitutes, (ii) profits are not necessarily an increasing function of both monitoring rates and prices, and welfare improvement from the lowest set of monitoring and pricing levels is possible, (iii) firms may prefer improvement in software rather than support packs, targeting especially the support-independent users.

Published
2008

38. Detection of Citrus tristeza virus (CTV) from Satsuma Owari mandarins (Citris unshiu) by direct tissue blot immunoassay (DTBIA), DAS-ELISA, and biological indexing

Author

Korkmaz, S., Cevik, B., Onder, S., Koc, K., and Bozan, O.

Abstract

Three different citrus-producing regions of Turkey—Edremit Gulf, Coastal Aegean, and eastern Black Sea—were surveyed in 2005 and 2006. A total of 119 samples were collected from Satsuma Owari mandarin (Citrus unshiu) trees grafted on Citrus tristeza virus (CTV)-resistant Poncirus trifoliata rootstocks in commercial groves and home gardens. All samples were tested for the presence of CTV by direct tissue blot immunoassay (DTBIA) and double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) using young shoots. The samples that tested positive were indexed for biological properties. The results obtained from DTBIA tests showed that 20 of 119 (16.8%) tested trees were infected with CTV and 99 trees were virus free. All samples that tested positive in DTBIA were also positive in DAS-ELISA. After biological indexing, none of these 20 isolates showed any symptoms on sour orange, grapefruit, and sweet orange plants, but all isolates induced vein-clearing symptoms on Mexican lime (Citrus aurantifoli) in 9 months. Some isolates also caused leaf-cupping and chlorosis in Mexican lime. However, 15 months after initial grafting, all isolates induced mild to moderate stem-pitting on Mexican lime. In addition, young tissues, petioles, and leaf samples were collected periodically at monthly intervals for 1 year (2006) from a 25-year-old Satsuma Owari mandarin grafted on P. trifoliata in the Edremit Gulf. CTV was readily detected in tissue blots of young shoots and petioles from CTV-infected plants during the autumn, winter, and spring seasons. Similarly, the highest ELISA values were obtained in April; the lowest values were noted in September. This study showed that DTBIA is a rapid, sensitive, and reliable procedure for detecting CTV under field conditions.

Published
2008
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