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Robert Benkoczi Hossam Hassanein Selim Akl Sylvia Tai 《Journal of Combinatorial Optimization》2006,11(1):113-123
In this paper we present and discuss several optimisation problems that arise in the management of data flow in wireless sensor
networks (WSNets). We consider a hierarchical architecture for WSNets composed of sensors, relays, and relay gateways. Sensors
send data they generate at a known average bit rate to relays in one hop. The relay nodes use a multi-hop mechanism to reach
a set of assigned gateways which then forward the data directly to the base station. We are concerned with finding an assignment
of relay gateways to relays so that certain constraints are satisfied. We define a unified model in which constraints such
as lifetime, data delay, and data flow splitting are formulated in terms of four optimisation problem in graphs. 相似文献
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Sadiman Kiykac Altinbas Yesim Bayoglu Tekin Berna Dilbaz Selim Kilic Susan S. Khalil Omer Kandemir 《Women and birth : journal of the Australian College of Midwives》2014,27(4):254-258
BackgroundTo compare the knowledge and preference of preconceptional contraception to future postpartum contraceptive method choice in high-risk pregnancies.Research questionDoes a high-risk pregnancy condition affect future postpartum contraceptive method choice?MethodWomen hospitalised at the High Risk Pregnancy unit of a tertiary research and training hospital were asked to complete a self-reported questionnaire that included demographic characteristics, presence of unintended pregnancy, contraceptive method of choice before the current pregnancy, plans for contraceptive use following delivery and requests for any contraceptive counselling in the postpartum period.FindingsA total of 655 pregnant women were recruited. The mean age, gravidity and parity of the women were 27.48 ± 6.25 years, 2.81 ± 2.15 and 1.40 ± 1.77, respectively. High-risk pregnancy indications included 207 (31.6%) maternal, 396 (60.5%) foetal and 52 (7.9%) uterine factors. All postpartum contraceptive choices except for combined oral contraceptives (COCs) usage were significantly different from preconceptional contraceptive preferences (p < 0.001). High-risk pregnancy indications, future child bearing, ideal number of children, income and education levels were the most important factors influencing postpartum contraceptive choices. While the leading contraceptive method in the postpartum period was long-acting reversible contraceptive methods (non-hormonal copper intrauterine device Cu-IUD, the levonorgestrel-releasing intrauterine system (LNG-IUS) (40%), the least preferred method was COCs use (5.2%) and preference of COCs use showed no difference between the preconceptional and postpartum periods (p = 0.202). Overall 73.7% of the women wanted to receive contraceptive counselling before their discharge.ConclusionA high-risk pregnancy condition may change the opinion and preference of contraceptive use, and also seems to affect the awareness of family planning methods. 相似文献
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This article is aimed at applying Taguchi method in Kansei engineering and explores a way to integrate it into an industrial product design stage. Emotional customer needs are derived using Kansei image word pairs. The Taguchi-based approach is validated by a case study with mobile phones. Experimental work in implementing the proposed approach was able to suggest design attributes of a mobile phone that are essential to be considered at the product design stage to satisfy the customers’ expectations and hence to increase the company's sales. 相似文献
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Selim Gündüz 《统计学通讯:理论与方法》2013,42(20):6149-6164
ABSTRACTThe distributions of algebraic functions of random variables are important in theory of probability and statistics and other areas such as engineering, reliability, and actuarial applications, and many results based on various distributions are available in the literature. The two-sided power distribution is defined on a bounded range, and it is a generalization of the uniform, triangular, and power-function probability distributions. This paper gives the exact distribution of the product of two independent two-sided power-distributed random variables in a computable representation. The percentiles of the product are then computed, and a real data application is given. 相似文献
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Abstract. This paper examines the sources of the gender wage gap in the Turkish labor market by using matched employer–employee data and the standard wage regression estimations as well as the Oaxaca decomposition method. The extensive number of variables in the data set enables a thorough quantitative analysis of the role of various individual‐ as well as firm‐related factors leading to wage differentials between men and women, namely human capital endowments including job tenure, occupational and industrial segregation, private/public sector location, coverage of the workplace under collective labor bargaining, and firm size. It also examines the extent of gender‐based industry and occupational segregation within the confines of data set and computes the Duncan & Duncan segregation index. We find that a large portion of the gender wage gap is attributable to women's considerably lower levels of work experience and job tenure. Other important variables that lead to pay differentials are women's lower concentration in jobs covered by collective labor bargaining and a substantial degree of occupational and industrial segregation. The differential rates of return to many of the wage determinant variables are also found to be significant in the formation of the gender wage gap. 相似文献
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Sibel Selim 《Social indicators research》2008,88(3):531-562
This research aims to investigate life satisfaction and happiness in Turkey. It extends the previous researches on subjective
well-being (SWB) for Turkey by considering both happiness and life satisfaction. The previous researches for Turkey are local
studies, and their findings cannot be generalized to the population of Turkish society. Given these facts, the factors that
shape individual happiness and life satisfaction amongst Turkish people are determined using a representative survey of sociocultural
and political change, World Values Survey (WVS). Some results obtained in this study are similar to typical findings such
as a negative age effect, positive influences of income and health status, and a negative effect of unemployment. Contrary
to the expectations, middle education has a negative direct effect on life satisfaction among females, and the upper education
level is insignificant in the life satisfaction model. By comparing the correlates of happiness and life satisfaction across
different years, this research aims to provide insights for policy makers and professionals to improve the perceived lives
of Turkish people.
相似文献
Sibel SelimEmail: |
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