• The Mathematical Education
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• v.12 no.2
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• pp.1-4
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• 1974

Matroid theory, which was first introduced in 1935 by Whitney (2), is a branch of combinational mathematics which has some very much to the fore in the last few years. H. Whitney had just spent several years working in the field of graph theory, and had noticed several similarities between the ideas of independence and rank in graph theory and those of linear independence and dimension in the study of vector spaces. A matroid is essentially a set with some kind of 'independence structure' defined on it. There are several known results concerning how matroids can be induced from given matroid by a digraph. The purpose of this note is to show that, given a matroid M$_{0}$ (N) and a digraph $\Gamma$(N), then a new matroid M(N) is induced, where A⊆N is independent in M(N) if and only if A is the set of initial vertices of a family of pairwise-vertex-disjoint paths with terminal vertices independent in M$_{0}$ (N).(N).

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.12B
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• pp.1051-1059
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• 2003

The key feature of GMPLS is the provision of network resources and the automatic set-up of a path. And the mechanism of protection and restoration of a path is presented when network component fails. This paper suggests CR-LDP Static Detour Mechanism and Dynamic Detour Mechanism. CR-LDP Detours are a mechanism to set up detour paths automatically at every node to protect working path. Hence suggested mechanism performance is compared with existing mechanisms by computer simulation.

• Journal of Navigation and Port Research
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• v.35 no.2
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• pp.137-147
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• 2011

The prime objective set for paper is to identify what are the women seafarers' problems and concerns regarding employment on cargo ships. From the cargo ship point of view, the question then is how to provide sufficient solutions for women seafarers in the male-dominated workplace of the ship through Corporate Social Responsibility(CSR) activities. The methodologies of study combine qualitative and quantitative research methods. The progress of research is to conduct a survey by asking a consistent set of key opinion leaders from the Republic of Korea. Moreover, to evaluate the elements of the result, the research explores the way in which we should consider giving priority to aspects of the problem. Finally, based on the terms of CSR, the author recommends measures to support the needs of women when they are employed onboard the world's merchant vessels.

• Journal of Information Technology Applications and Management
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• v.26 no.2
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• pp.89-110
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• 2019

Information technology is an effective means for raising firm competitiveness. In fact, what to purchase or how to purchase it must fall under a highly complex decision-making in which many different stakeholders are involved. These stakeholders are often known to take a defensive behavior. That is, instead of working toward a common goal of organizational performance, each individual of these stakeholders tends to act defensively to avoid risks he/she faces or minimize subsequent changes. Despite a frequent occurrence of defensive behavior in the process of IT purchasing, there has been no research about defensiveness in IT purchasing. Our study aims to elicit different types of defensive behavior in IT purchasing situations and to identify causes of these defensive behaviors. To this end, we surveyed IT professionals having much experience in IT purchasing and took a qualitative analysis on their opinions. We found out that there exist 9 different types of defensive behavior in IT purchasing and identified a set of factors causing the defensiveness and a set of their consequences.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.9 no.2
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• pp.171-179
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• 1997

During the day time in summer, peak of air conditing load, and electric power management system lies under overloaded condition. The reason is the enlarged peak load value of electric power caused by increased air-cooling load in summer. To prevent load concentration during day time and overloaded condition of power management system, some energy storage methods are suggested. One of these methods is ice storage system. Water has some good properties as P.C.M.(Phase Chang Material) : Its melting point is the range of required operation temperature. It has large specific latent heat and is chemically stable compared to other organic or inorganic substances. It is cheap and easy to treat. This study represents experimental results of heat transfer characteristics of P.C.M. under the outward melting process in a vertical cylinder. We experimented with twelve combinations of conditions, i.e., three different inlet temperatures($7^{\circ}C,\;4^{\circ}C\;and\;1^{\circ}C$), two working fluid directions(upward and downward), and two aspect ratios, H/R(4 and 2). At the inlet temperature of $7^{\circ}C$ and $4^{\circ}C$, there was temperature stagnation region where the temperature of P.C.M. remains constant at $4^{\circ}C$ regardless of aspect ratio and direction of working fluid. This temperature stagnation occurs as the water, at its maximum density, flows down to the lower region. The phase change interface formed bell-shaped curve as the melting process continued. With a new set of conditions(4H/R, inlet temperature $4^{\circ}C$ and $1^{\circ}C$, downward/upwerd inlet direction), the movement of phase change interface was faster when the working flued inlet direction was downward. With the same set of conditions, melting rate and total melting energy were larger when the working fluid inlet direction was downward. The results were reversed when the other sets of conditions were applied.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.422-424
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• 2000

웹서버는 disk I/O 오버헤드를 줄이기 위해 웹 문서를 메모리 캐슁한다. 하지만 동시에 들어오는 connection들에 대해 처리 순서는 고려하지 않으므로 같은 문서를 요구하는 request들이 메모리 캐쉬의 working set내에 들어오지 않을 경우 disk I/O를 추가시킬 수 있다. 본 논문에서는 동시에 처리해야 할 같은 작업량을 요구하는 request는 연속적으로 처리함으로써 disk I/O 오버헤드를 줄이는 우선 순위 스케쥴링을 수행함으로써 정적 웹 환경서의 사용자 응답 시간을 줄였다.

• Communications of the Korean Mathematical Society
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• v.11 no.2
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• pp.525-538
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• 1996

In the course of working on the preconditioning of $C^1$-bicubic collocation method, one has to deal with the $C^1$-bicubic splines. In this paper we are concerned with $C^1$-bicubic spline interpolant for a given function. We construct a basis for the space of $C^1$-bicubic splines for a given partition and find the $C^1$-bicubic spline interpolant for a given function defined on a set.

• Wind and Structures
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• v.8 no.4
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• pp.283-294
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• 2005

This paper describes the work of the Working Group on wind pressure coefficients on low-rise structures, one of the groups set up by the International Association of Wind Engineering in 1999. General aspects of wind loading on low-rise structures are summarized. The definition, derivation and codification of loading coefficients is described. Comparisons of pressure coefficients on low rise structures are made between a selection of wind loading standards. Recommendations for consistency and for the harmonization of these coefficients are given.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1757-1760
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• 2005

요구 페이징 방식의 가상메모리 시스템에서 페이지 참조 스트링에 따른 페이지 교체 알고리즘의 성능평가를 위한 시뮬레이션을 개발한다. 참조 집약성을 기반으로 워킹세트(working set) 모델을 수정한 MWS 교체 알고리즘을 제안하였고 다양한 교체 알고리즘(FIFO, SC, LFU, LRU, Rand)들과 비교 실험한 결과 MWS는 발생 페이지 부재 수 측면에서 다른 교체 정책 보다 성능이 우수하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.1053-1057
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• 2007

One of the important roles of glass is safety guarantee in CRTs. It is working under high vacuum and has to be maintained continuously for the atmosphere pressure, humidity, and excitation etc,. This paper propose to CRTs glass design method via the stress positioning control for slim CRTs using FEM to ensure the national safety standard and newly demanded safety standard by CRTs set makers.