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동계 난방시 구조체 축열 공조시스템의 축·방열 특성에 관한 연구
임지훈,이시환,차영호,정광섭,이정재 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1
It is the plan that storage gets energy done by in structure with what thermal storage of structure changes only supply air duct among the existing HVAC system, and a basic principle coordinates the damper that it was installed makeup air in supply air duct like former HVAC system to an inside at supply and a night by day, and do makeup air supply with in ceiling space of thermal storage of structure HVAC system. This thermal storage of structure HVAC system uses the existing utility system, and energy saving can get structure of building done with energy storage, before air conditioning and peak load cut getting day heat load done.
류지구,최혁환,차영호,김정헌,조경연 釜慶大學校 1997 釜慶大學校 論文集 Vol.2 No.2
The wide spread of multimedia sysrem deands a large viewing display device which can inform a message to many peoples in open area. This paper is about the design and simulating of a large viewing digital multi-wision control ASIC(Application Specific Integrated Circuit). In this paper. the digital multi-vision ASIC has one channel of imput cideo signal wihich is compliance with CCIR-656 specification and four channels of output video signal which are compliance with CCIR-601 specificarion. It has 2 operating mode. The one is the pass-thro;ugh mode. input vido signal goes to output video signal without any change, and the another one is the expension mode, input video signal is expended by from 2 to 16 times into output video signal. In expension mode. awindow could be programmed and only the input video signal in the window is expended. The 0.6 micron CMOS sEA OF Gate is used to design the ASIC in amount of about 23,000 gates, and it is simulated at 48MHz.
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)
김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.
Prediction of the residual failure processes based on the process history
Cha, Ji Hwan,Badí,a, F. G. Taylor & Francis Inc. 2017 Communications in Statistics Vol.46 No.13
<P>In the reliability area, the concept of the residual lifetime of a non repairable system is very important and its property has been intensively studied. In this article, we define the 'residual failure process' for a repairable system and study its stochastic properties thoroughly. The detailed discussions are given when the corresponding failure process is a renewal process. An illustrative example is also discussed.</P>
Dynamic mixing probability measures of mixtures
Cha, Ji Hwan,Mi, Jie Informa UK (TaylorFrancis) 2016 Communications in Statistics Vol.45 No.16
<P>Lifetime of heterogeneous population can be modeled as mixture of a family of lifetime distributions according to a mixing probability measure. With the help of dynamic mixing measure, the hazard rate of the mixture can also be expressed as the mixture of the hazard rates of the lifetime distributions. Various local stochastic orderings are defined in this article. Applying these local stochastic orderings, we can explore the behavior of the dynamic mixing measures locally and then compare the hazard rates of two heterogeneous populations in both the local and global ways.</P>
Bivariate preventive maintenance of systems with lifetimes dependent on a random shock process
Cha, Ji Hwan,Finkelstein, Maxim,Levitin, Gregory Elsevier 2018 european journal of operational research - Vol.266 No.1
<P><B>Abstract</B></P> <P>We consider a bivariate model for preventive maintenance for items operating in a random environment modeled by a Poisson process of shocks. An item is replaced either on failure or on the predetermined replacement time or on a shock with the predetermined number, whichever comes first. Each shock in our stochastic model has a double effect. First, it acts directly on the failure rate of an item, which results in the corresponding stochastic intensity process, secondly, each shock causes additional ‘damage’, which can be attributed, e.g., to a short drop in the output of a system. The corresponding bivariate optimization problem is considered and illustrated by detailed numerical examples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This paper discusses preventive replacement for a system affected by the external shock process. </LI> <LI> A system is replaced either on failure, or at <I>T</I>, or on the <I>m</I>th shock, whichever comes first. </LI> <LI> It provides a comprehensive insight into the preventive maintenance models with two scales. </LI> <LI> By a shock, the failure rate is increased and the output function is decreased. </LI> </UL> </P>
On a Terminating Shock Process with Independent Wear Increments
Cha, Ji Hwan,Finkelstein, Maxim Cambridge University Press 2009 Journal of applied probability Vol.46 No.2
<P>In extreme shock models, only the impact of the current, possibly fatal shock is usually taken into account, whereas in cumulative shock models, the impact of the preceding shocks is accumulated as well. In this paper we combine an extreme shock model with a specific cumulative shock model. It is shown that the proposed setting can also be interpreted as a generalization of the well-known Brown-Proschan model that describes repair actions for repairable systems. For a system subject to a specific process of shocks, we derive the survival probability and the corresponding failure rate function. Some meaningful interpretations and examples are discussed.</P>
On information-based residual lifetime in survival models with delayed failures
Cha, Ji Hwan,Finkelstein, Maxim Elsevier 2018 STATISTICS & PROBABILITY LETTERS - Vol.137 No.-
<P><B>Abstract</B></P> <P>At many practical instances, the initiating point events (e.g., shocks) affect an object not immediately, but after some random delay. These models were studied in the literature only for the case when an initial shock process is Poisson. In our paper, we generalize these results to a meaningful case of the generalized Polya process (GPP) of initial shocks that was recently introduced in the literature. Distinct from the Poisson process, the GPP possesses the property of dependent increments, which makes it much more attractive in applications. We derive the distribution of the time to failure for a system subject to the GPP with delays. Our main focus, however, is on analysis of the corresponding residual lifetime distribution that depends now on the full history (information) of the initiating shock process.</P>
STOCHASTIC SURVIVAL MODELS WITH EVENTS TRIGGERED BY EXTERNAL SHOCKS
Cha, Ji Hwan,Finkelstein, Maxim Cambridge University Press 2012 Probability in the engineering and informational s Vol.26 No.2
<P>In most conventional settings, the events caused by an external shock are initiated at the moments of its occurrence. In this paper, we study <I>the new classes of shock models</I>: (i) When each shock from a nonhomogeneous Poisson processes can trigger a failure of a system not immediately, as in classical extreme shock models, but with delay of some random time. (ii) When each shock from a nonhomogeneous Poisson processes results not in an ‘immediate’ increment of wear, as in classical accumulated wear models, but triggers its own increasing wear process. The wear from different shocks is accumulated and the failure of a system occurs when it reaches a given boundary. We derive the corresponding survival and failure rate functions. Furthermore, we study the limiting behavior of the failure rate function where it is applicable.</P>