• Korean Journal of Social Welfare
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• v.68 no.2
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• pp.79-105
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• 2016

This study aimed to understand the pre-capitalistic distributional system in association with politics and economics by examining the distributional system between 1876 (the opening of a port era) and 1910. The study revealed that the distributional system reflected the political and economic characteristics and changes of the pre-capitalistic society. The examination indicated the following implications and questions. First, we need a new narrative of Chosun's distributional system before the period of Japanese occupation. Chosun's distributional system can be identified as a self sufficient system (Hwan-gok). Second, most social welfare literature discuss private self sufficient system such as Gye or Hwang-Yak as the distributional system in the pre-modern Chosun; however, this does not accurately explain the system of Chosun society. Implication of such findings are discussed.

• Journal of the Korean Data and Information Science Society
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• v.20 no.3
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• pp.467-474
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• 2009

There are many situations arising in reliability engineering and biomedical science where failure of a subsystem increases the failure rate of other subsystem under shared load models. In this paper, the maximum likelihood estimates and the modified maximum likelihood estimates of mean time to failure and reliability function for shared load model with guarantee time are obtained by using censored system life data. Some illustrative examples are included.

• Korean Association of Arts Management
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• no.49
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• pp.177-200
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• 2019

The purpose of this study is to critically explore and make an issue of the distribution system presented by Victoria Alexander's 'Modified Cultural Diamond' model. Street artist Banksy was served as a single case, and various secondary data were collected and analyzed for the purposes of this study. First, this study examined the formation of the aesthetic discourse and the increase in the value of Banksy's works by the market intermediaries constituting the distribution system. In addition, this paper placed Banksy's actions and works in Alexander's theoretical framework and critically discussed the following three aspects of the distribution system of 'Modified Cultural Diamond': the divorce between artists and artworks by the distribution system; the ignorance of the direct connection between artist and consumer; and lastly the exclusion of the possibility of distributing works by artists. Based on this discussion, this study has significance in making a theoretical model of Alexander academically controversial.

• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.158-159
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• 2002

오늘날에도 RSA암호문은 현대 암호에 대부분 적용될 정도로 안전하다고 생각되어왔다. 또한 PGP(Pretty Good Privacy)라는 가장 대중적인 암호화 소프트웨어도 RSA 원리를 기반으로 하고 있다. 그러나 RSA암호화체계는 주요한 결점이 있다. 인수분해하는 것이 ＂어렵다＂라고 하지만, 결코 증명되지 않았고, 또한 인수분해를 수행하는 아주 빠른 알고리즘의 존재가 전혀 불가능하지는 않기 때문이다. 따라서 현존하는 암호화 체계보다 더 확실한 안전을 보장해주는 새로운 암호화 체계와 암호화키의 분배시스템의 필요성이 대두되고 있다. (중략)

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.283-285
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• 2004

개발과정에서의 오류로 인한 취약점을 이용한 공격들이 늘어나면서 이에 대한 보안패치를 체계적인 방법으로 신속하게 자동 분배가 가능한 보안패치 분배 시스템에 대한 필요성이 증대되고 있다. 그러나, 이러한 시스템을 설계 및 구현하는 과정에서 많은 문제점이 대두되었다. 본 논문에서는 이러한 문제점들을 해결하고 분산 시스템 환경 및 안전한 통신을 기반으로 보안패치를 분배할 수 있도록 하기 위해서 Java RMI와 SSL를 함께 사용한 보안패치 분배 시스템 프레임워크를 설계, 제시하고자 한다.

• Journal of Industrial Technology
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• v.21 no.B
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• pp.37-44
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• 2001

Distribution System is considered as the most important part of SCM when the satisfaction of customer demand is considered. This paper focus on the backorder policies for stockout which is occurred in each regional distribution center of two-echelon distribution system facing stochastic demand process. Four concepts for the efficient system operation are suggested. First, at least 30% reduction of stockout is achieved by introduction of 50/25 allocation policy to distribution system. Second, transportation cost and lead-time of backorder are decreased by allowance of internal supply between regional distribution centers. Third, the frequency of emergency supply is minimized by application of Ship-up-to- expected-demand backorder policies. Finally we suggest several effective rules to select multi-internal suppliers. Simulation tests show the efficiency of our backorder policies and enhancement of customer service level.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1993.04a
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• pp.226-226
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• 1993

• Journal of the Korea Society of Computer and Information
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• v.5 no.4
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• pp.200-210
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• 2000

Distribution Activity for customer is preferred at Physical distribution system in e-commerce, so fast delivery and low distribution cost determine the core competency of enterprise. Because there is no cooperative system between with distribution centers in traditional distribution system, it is difficult to optimize the system. The purpose of this paper is to propose a cost structure model for multi-stage distribution system, which is used for determination of joint lot size and optimal demand and transportation policy. It is expected to contribute to development of algorithm for joint distribution system, which is minimized the transportation cost by the result of this cost structure model.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.32 no.3
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• pp.141-147
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• 2019

In this paper, a systematic beam splitter design for multi-beam forming is proposed. The objective of this research is to a design beam splitter that splits and focuses scattering microwaves into intense beams in multiple directions. It is difficult to split multi-beam to non-specific directions with theoretical approaches. Therefore, instead of using transformation optics(TO), which is a widely used process for controlling electromagnetic wave propagation, we used a systematic design process called the phase field design method to obtain an optimal topological structure of beam splitter. The objective function is to maximize the norm of electric field of the target areas of each direction. To avoid island structure and obtain the structure in one body, volume constraint is added to the optimization problem by using augmented Lagrangian. Target frequency is set to X-band 10GHz. The optimal beam splitter performed well in multi-beam forming and the transported electric energy of target areas improved. A frequency dependency test was conducted in the X-band to determine effective frequency range.

• The Magazine of the IEIE
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• v.20 no.9
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• pp.1-8
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• 1993