• Title/Summary/Keyword: New class

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Some Results About $NBU_{mgf}$ Class of Life Distributions

  • Ahmad, I.A.;Kayid, M.
    • International Journal of Reliability and Applications
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    • v.5 no.4
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    • pp.155-162
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    • 2004
  • A new class of life distributions is studied. This class is defined based on comparing the residual life to the whole life in the moment generating function order giving "the new better than used in the moment generating function order ageing class ($NBU_{mgf}$)". Some new results of this class are given including some closere properties and characterizations. Finally testing exponentially against the $NBU_{mgf}$ class is also addressed.

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Further Results Involving the $NBU_{mgf}$ Class of Life Distributions

  • Elbatal I.
    • International Journal of Reliability and Applications
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    • v.7 no.1
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    • pp.13-25
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    • 2006
  • A new class of life distributions is studied. This class is defined based on comparing the residual life time to the whole life in the moment generating function order giving 'the new better than used in the moment generating function order ageing class $(NBU_{mgf})$'. Fundamental properties of this class are given including some closure properties and characterizations. Finally, we consider new results about comparisons of age and block replacement policies when the underlying distribution belongs to $NBU_{mgf}$ aging classes.

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A new Class-D voltage source series-loaded resonant inverter topology considering stray inductance influences (부유 인덕턴스의 영향을 고려한 새로운 CLASS-D 직렬부하 공진형 인버터)

  • 이병국;유상봉;서범석;현동석
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.2
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    • pp.199-215
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    • 1996
  • A new Class-D series-loaded resonant inverter topology which can minimize the influences of the stray inductances is presented. In the conventional Class-D inverters, the stray inductances not only result in the overvoltage which gives the switches voltage stresses, but also in the high frequency resonant currents during turn-off transients. The new Class-D inverter is superior to the conventional Class-D inverters with respect to minimization of the problems caused by the stray inductances and is more suitable for high power and high frequency inverter systems such as induction heating. The validity of the new Class-D inverter is verified by simulation and experimental results.

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A Study on the New Control Scheme of Class-I Inverter for IH-Jar Applications with Clamped Voltage Characteristics Using Pulse frequency Modulation (주파수 변조 기법을 이용한 전압 클램프 특성을 갖는 유도가열용 Class-E 인버터의 새로운 제어에 관한 연구)

  • 이동윤;최영덕;현동석
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.3
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    • pp.133-139
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    • 2003
  • In this paper, a new control scheme of Class-E inverter for Induction Heating (IH) Jar applications with clamped voltage characteristics using Pulse-Frequency-Modulation (PFM) is introduced. To reduce the voltage stress of switch, the proposed PFM control scheme doesn't need any auxiliary circuit in comparison to a family of Active Clamped Class-E (ACCE) inverter. It can decrease voltage stress of switch through modulation of switching frequency. The Class-E inverter using the proposed control scheme has the advantage of not only the same output power when it is compared with a Hybrid-Active Clamped Class-E (Hybrid-ACCE) inverter but also Zero-Voltage-Switching (ZVS), which are characteristics of conventional Class-E and ACCE inverter. The control principles and analysis of proposed method are explained in detail and its validity is verified through simulation and experimental results.

A new class of bivariate distributions with exponential and gamma conditionals

  • Gharib, M.;Mohammed, B.I.
    • International Journal of Reliability and Applications
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    • v.15 no.2
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    • pp.111-123
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    • 2014
  • A new class of bivariate distributions is derived by specifying its conditionals as the exponential and gamma distributions. Some properties and relations with other distributions of the new class are studied. In particular, the estimation of parameters is considered by the methods of maximum likelihood and pseudolikelihood of a special case of the new class. An application using a real bivariate data is given for illustrating the flexibility of the new class in this context, and, also, for comparing the estimation results obtained by the maximum likelihood and pseudolikelihood methods.

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A new approach to moment inequalities for NBRU class of life distributions with hypothesis testing applications

  • Mahmoud, M.A.W.;Albassam, M.S.;Abdulfattah, E.H.
    • International Journal of Reliability and Applications
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    • v.11 no.2
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    • pp.139-151
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    • 2010
  • The main objective of this study is to present a new approach to obtain moment inequalities for the new better than renewal used (NBRU) class of life distributions. In order to achieve our main objective, the moment inequalities for NBRU class of life distribution using the new approach has been derived and then a new test for testing exponentiality against NBRU class based on these inequalities has been constructed. Then we calculate the Pitman asymptotic efficiency for the proposed test using some alternative distributions and comparing it with the other tests. Moreover, we make a comparison between Pittman asymptotic efficiencies (PAE's) and PAE's of some other tests. A simulation study is conducted to calculate the upper critical values and the power estimate of the proposed test for some common alternatives. Finally, we apply the suggested test to some real data.

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A Dual Problem and Duality Theorems for Average Shadow Prices in Mathematical Programming

  • Cho, Seong-Cheol
    • Journal of the Korean Operations Research and Management Science Society
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    • v.18 no.2
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    • pp.147-156
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    • 1993
  • Recently a new concept of shadow prices, called average shadow price, has been developed. This paper provides a dual problem and the corresponding duality theorems justifying this new shadow price. The general duality framework is used. As an important secondary result, a new reduced class of price function, the pp. h.-class, has been developed for the general duality theory. This should be distinguished from other known reductions achieved in some specific areas of mathematical programming, in that it sustains the strong duality property in all the mathematical programs. The new general dual problem suggested with this pp. h.-class provides, as an optimal solution, the average shadow prices.

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The Meditation Effects of Self-esteem on the Relationship model between Korean new elderly class's Recovery resilience and Productive aging (한국 신노년층의 회복탄력성과 생산적 노화의 관계에서 자아존중감의 매개효과 검증)

  • Yi, Eun-Surk;An, Chan-Woo;Cho, Gun-Sang
    • Journal of the Korea Convergence Society
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    • v.8 no.5
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    • pp.255-263
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    • 2017
  • The purpose of this study was to investigate the meditation effects of self-esteem on the relationship model between Korean new elderly class's recovery resilience and productive aging. This study sampled preliminary elderly people in other provinces nationwide. Data from a total of effective 484 subjects was analyzed. The collected data was processed using the IBM SPSS 20.0 and AMOS 5.0, and underwent descriptive statistical analysis, confirmatory factor analysis, and structure model verification. The results are as follows; First, recovery resilience of Korean new elderly class's affect their self-esteem. Second, recovery resilience of Korean new elderly class's affect their productive aging. Third, self-esteem of Korean new elderly class's affect their productive aging. Lastly thel relationship among recovery resilience, self-esteem and productive aging of Korean new elderly class's shows partial mediation, and there is the mediation effect.

A new class of life distributions based on unknown age

  • El-Di, M.M. Mohie;Abu-Youss, S.E.;Al, Nahed S.A.
    • International Journal of Reliability and Applications
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    • v.16 no.1
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    • pp.27-34
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    • 2015
  • Based on increasing concave ordering a new class of life distribution is introduced. The new class of life distribution is named used better than aged in increasing concave ordering and is denoted by UBAC(2). The implication of our proposed class of life distribution with other classes is given. The properties of UBAC(2) under convolution, discrete mixture and formation of a coherent system are studied. Finally a characterization of the proposed class of life distributions by Laplace transform is discussed.

A NEW CLASS OF RANDOM COMPLETELY GENERALIZED STRONGLY NONLINEAR QUASI-COMPLEMENTARITY PROBLEMS FOR RANDOM FUZZY MAPPINGS

  • Huang, Nam-Jing
    • Journal of applied mathematics & informatics
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    • v.5 no.2
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    • pp.357-372
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    • 1998
  • In this paper we introduce and study a new class of random completely generalized strongly nonlinear quasi -comple- mentarity problems with non-compact valued random fuzzy map-pings and construct some new iterative algorithms for this kind of random fuzzy quasi-complementarity problems. We also prove the existence of random solutions for this class of random fuzzy quasi-complementarity problems and the convergence of random iterative sequences generated by the algorithms.