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51.
Samuel Kerem 《电子设计技术》2003,10(6):95-97
为了提高冗余度,不少使用“或”运算二极管的电源都可接入同一个负载。在维护期间,当你拆去任何一个电源时,希望负载的电源骚动尽可能最小。为了补偿“或”运算二极管两端的电压降,你必须在“或”运算二极管之后,在负载处连接电源反馈线。因此,所有参与电源的反馈连接是通用的(图1)。因为每一个电源都会发生自然变化,所以只有V_(OUT)最大的电源才是有效的。其他检测“高电位”输出的电源都试图降低其输出,从而有效地中止稳压功能。如果从与图1类 相似文献
52.
Fatih Evrendilek Nusret Karakaya Kerem Gungor Guler Aslan 《Expert systems with applications》2012,39(2):2059-2066
Simple regression algorithms were developed to quantify spatio-temporal dynamics of minimum and maximum air temperatures (Tmin and Tmax, respectively) and soil temperature for a depth of 0-5 cm (Tsoil-5cm) across complex terrain in Turkey using Moderate Resolution Imaging Spectroradiometer (MODIS) data at a 500-m resolution. A total of 762 16-day MODIS composites (127 images × 6 bands) between 2000 and 2005 were averaged over a monthly basis to temporally match monthly Tmin, Tmax, and Tsoil-5cm from 83 meteorological stations. A total of 60 (28 temporally averaged plus 32 time series-based) linear regression models of Tmin, Tmax, and Tsoil-5cm were developed using best subsets procedure as a function of a combination of 12 explanatory variables: six MODIS bands of blue, red, near infrared (NIR), middle infrared (MIR), normalized difference vegetation index (NDVI), and enhanced vegetation index (EVI); four geographical variables of latitude, longitude, altitude, and distance to sea (DtS); and two temporal variables of month, and year. The best multiple linear regression models elucidated 65% (RMSE = 5.9 °C), 65% (RMSE = 5.1 °C), and 57% (RMSE = 6.9 °C) of variations in Tmin, Tmax, and Tsoil-5cm, respectively, under a wide range of Tmin (−34 to 25 °C), Tmax (0.2-47 °C) and Tsoil-5cm (−9 to 40 °C) observed at the 83 stations. 相似文献
53.
54.
Vladan Popovic Kerem Seyid Abdulkadir Akin Ömer Cogal Hossein Afshari Alexandre Schmid Yusuf Leblebici 《Journal of Signal Processing Systems》2014,76(2):169-184
Panoptic is a custom spherical light field camera used as a polydioptric system where imagers are distributed over a hemispherical surface, each having its own vision of the surroundings and a distinct focal plane. The spherical light field camera records light information from any direction around its center. This paper revises previously developed Nearest Neighbor and Linear blending techniques. Novel Gaussian blending and Restricted Gaussian blending techniques for vision reconstruction of a virtual observer located inside the spherical geometry are presented. These new blending techniques improve the output quality of the reconstructed image with respect to the ordinary stitching techniques and simpler image blending algorithms. A comparison of the developed blending algorithms is also given in this paper. A hardware architecture based on Field Programmable Gate Arrays (FPGA) enabling the real-time implementation of the blending algorithms is presented, along with the imaging results and resource utilization comparison. A recorded omnidirectional video is attached as a supplementary material. 相似文献
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56.
Kerem Tomak Kemal Altinkemer Burak Kazaz 《Information Systems and E-Business Management》2003,1(1):93-117
The objective of this paper is to study a communication system based on aM
(x)/
D/1 queueing system representing a cell-switch network like Asynchronous Transfer Mode (ATM) network. Network structure consists
of a single link modeled as a batch arrival markovian queue with non-preemptive head of the line priority service. Network
manager (NM) is assumed to be a decision maker at a Management Information System (MIS) department. This paper establishes
the incentive compatible pricing which maximizes the net value of the overall corporation, while the delays have to satisfy
the Quality of Service (QoS) guarantees. We obtain structural results for the two priority case in the short run. In equilibrium,
we find that the network manager maximizes the price spread between the two priority class services. We prove that as the
capacity level increases indefinitely, the market is equally divided among the priority classes. In the first part of the
paper, we assume that the users do not respond to network manager’s prices. In the second part, we relax this assumption and
look at a leader follower game. Users choose their willingness to pay by deciding on how much value they assign to timely
transmission of messages after seeing the prices set by the network manager. Our results indicate that unless there is high
enough capacity set upex ante, monopoly network provider cannot price discriminate by offering different quality of service via priority classes. This
trade-off between ex ante capacity level choice and ex post price discrimination decision is eliminated if the capacity is
set high. It is shown in the network literature that best effort services lead to lower quality of service, in general, for
a single service. We show that this holds in multiple priority services as well. We prove that when the capacity is also considered
as a decision variable, simultaneous capacity and price setting yields the same optimal level with sequential capacity and
price choices. 相似文献
57.
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60.
Kerem Altug Guler 《Russian Journal of Non-Ferrous Metals》2013,54(6):480-483
Solid investment moulds are used for precious or non-precious metals and alloys castings, the most common application areas are dental prosthesis and jewellery fabrications. Investment casting is known for high dimensional accuracy and smooth surface finish. Casting of ultra-thin sections and small complex parts require vacuum assisted or centrifugal filling. In this study, solid investment casting of aluminium has been tried and surface quality of the castings was investigated. Specially designed steppedwedge surface roughness specimens were produced with A413 aluminium alloy casting into gypsum bonded solid moulds. Casting operations were carried out in two ways; the first only with gravitational force and the second with vacuum assistance. Surface roughness of as cast specimens were measured, effects of section thickness, vacuum assistance and location of the pattern on the wax tree were determined. 相似文献