• The Journal of the Korea Contents Association
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• v.10 no.10
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• pp.389-397
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• 2010

This study is to find out influences of IT innovations factors on e-commerce diffusion, management performance. To research and analyze, from August 15th to September 15th in 2009, the questionary distributed 150 working employees at Purchasing Team & Finance Team in five star hotel in Seoul Metropolitan Area, then used for data analysis 135. The results come up with; Firstly, the factors of Information Techonology impacted on e-commerce diffusion & management performance. Secondly, e-commerce diffusion within company only had effect on management performance. The implication of this study is that if IT innovation factors were improved, hotels would have competitive achievement.

• Journal of the Korean Society of Propulsion Engineers
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• v.6 no.2
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• pp.65-74
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• 2002

Optimal supersonic diffuser shape of integrated rocket ramjet engine was derived which maximizes the total pressure recovery. Mass flux is considered as a design constraint and the second oblique shock angle of the external ramp, the cowl-lip angle and the throat area are selected as design variables. Refined response surface method through design space transformation technique was developed and employed, and high confidence level of the regression model could be obtained. Genetic algorithm was implemented for both system optimizer and subspace regression model optimization. Virtual nozzle was located at the end of throat to adjust the back pressure. With only 20 aerodynamic analyses, optimal supersonic diffuser shape which has 14% improved total pressure recovery characteristics was successfully designed.

• Journal of the Korean Institute of Telematics and Electronics C
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• v.35C no.10
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• pp.12-21
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• 1998

A chaotic spread spectrum communication system using a polar quarternary method is designed and implemented. Four different chaotic signals in the relation of multiplication each other are generated through the use of a coupled synchronization method in the transmitter which is composed of four Chua's circuits. Information is retrieved at the receiver which is connected to the transmitter through the use of a drive synchronization method. Since spread spectrum of information signal is spread by chaotic signal, the configuration of the system is simpler than that of any other conventional system.

• Science & Technology Policy
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• v.13 no.4 s.142
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• pp.90-101
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• 2003

대량살상무기의 확산을 근본적으로 차단하기 위한 경제 제재의 활용은 1990년대에 들어서 새로운 차원으로 전개됨. 이전시기까지 제정된 법규들은 특정한 핵확산 활동에 관여한 국가들에 대한 외국원조의 중단을 요구하였으며, 해당 국가들이 관련 조약 및 국제협약상의 목표를 준수하게끔 하나의 가능한 메커니즘으로서 제재 방안들을 규정함. 1990년에 들어서서 미 의회는 미사일 확산에 관련되어 무역제재를 위한 명확한 지침을 입법화함. 1990년에 들어서 무기수출통제법(Arms Export Control Act)과 1979년 수출관리법 (Export Adminstration Act of 1979)에 미사일기술통제레짐의 부속서(MTCR Annex)에 등재된 품목이나 기술을 거래하는데 관여한 미국 시민 또는 외국인에 대해 미 대통령이 규제를 부과한다는 점이 필수사항으로 첨가됨. 이어서 미 의회는 광범위한 형태의 법률을 통해 생ㆍ화학무기 및 핵무기의 확산에 기여하는 국가들에 대해 경제제재를 가할 것을 입법화함. 본 보고서에서는 미국내 비확산 규정을 위반한 국가, 기업 또는 개인들에 대해 일종의 경제제재를 부과하는 것을 요구하거나 승인하는 법규들을 간략히 서술하고 있음. 다음에 열거하는 각각의 규정에는 제재 부과의 이유, 제재 기간에 관련된 정보를 포함하여, 미 대통령이 제재 부과를 연기, 중단 및 포기할 수 있는 권한의 구체적 내용들을 서술함.

• Journal of the Korea Concrete Institute
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• v.28 no.4
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• pp.481-488
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• 2016

Concrete member has been subjected to dead and live loads in use, and the induced stress can affect not only structural but also durability behavior. In mass concrete construction, construction joint are required, however cold joint usually occur due to poor surface treatment and delayed concrete placing. The concrete with joint is vulnerable to both shear stress and chloride ingress. This paper presents a quantitative evaluation of cold joint and loading conditions on chloride diffusion behavior. With increasing tensile stress from 30% to 60%, chloride diffusion coefficient gradually increases, which shows no significant difference from result in the sound concrete. However chloride diffusion coefficient under 30% level of compressive stress significantly increases by 1.70 times compared with normal condition. Special attention should be paid for the enlarged diffusion behavior cold joint concrete under compressive stress.

• Monthly Duck's Village
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• s.60
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• pp.74-76
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• 2008

농림수산식품부(이하 농식품부)에서는 최근 AI가 발생한 경남.북 지역의 추가 발생 예방과 다른 지역으로 확산을 방지하기 위해 전국적으로 특단의 방역 강화조치가 필요하다고 판단, 다음과 같이 "AI 확산방지를 위한 방역 강화 조치"를 마련하고 홍보키로 하였다. 또한 농식품부에서는 경찰청에 5월 19일부터 실시할 계획인 모든 오리.닭 운송차량의 소독여부에 대한 길거리 단속과 관련해 지방 경찰서에서도 적극적인 단속활동이 이루어질 수 있도록 당부하였다.

• Fire Science and Engineering
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• v.31 no.3
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• pp.79-87
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• 2017

Sandwich panels which are having the both sides are bonded with a heat insulating material with an iron plate are used as factories, warehouse structures as advantages of convenience in construction at economic efficiency of material cost. However, in a panel structure constructed by continuous joining of sandwich panels, a joint portion where a panel and a panel are connected is generated. The joint part is a part which is easily vulnerable to fire because flames easily flow into the melting and deformation of the iron plate during fire. The flames flowing into the panel induce diffusion of fire by rapid burning, causing damage of human life and property. In this research, we developed a flame spread prevention plate to prevent spreading of sandwich panel. This is an improvement of the workability by the anti-spreading construction method of the existing previous research, it can be applied independently to the connecting part where the panel and the panel are coupled, designed to prevent inflow and spreading of flame did. The actual fire test of the test method of KS F ISO 13784-1 of the sandwich panel specimen was conducted and the burning behavior corresponding to the presence or absence of application of the flame spread prevention plate was grasped at the panel connection part and its effect was measured. Inserting a fire spreading plate into the test result panel connecting part is measured by delaying the flashover, prevention of collapse of the specimen, and temperature rise of the opening, effectively improving the fire safety of the panel structure It was confirmed as a method that can be secured. It is judged that panel structure will contribute to ensuring fire safety by applying the fire spread prevention construction method of various methods ensuring the workability and economy of panel connection vulnerable to fire.

• Journal of the Korea institute for structural maintenance and inspection
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• v.20 no.5
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• pp.44-49
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• 2016

Among the deteriorating agents, chloride ion is reported to be one of the most harmful ions due to its rapid diffusion and direct effect on steel corrosion. Cold joint which occurs in mass concrete placing is vulnerable to shear resistance and more severe deterioration. The paper presents an quantitative evaluation of chloride diffusion coefficient in OPC(Ordinary Portland Cement) and GGBFS(Ground Granulated Blast Furnace Slag) concrete containing cold joint. GGBFS concrete shows $6.6{\times}10^{-12}m^2/sec$ which is almost 30% level of OPC concrete results and the trend is repeated in the case of cold joint concrete. Compared with OPC concrete, GGBFS concrete is evaluated to have better resistance to chloride penetration, showing 0.30 times of chloride diffusion coefficient in concrete without cold joint 0.39 times with cold joint, respectively.

• Proceedings of the Membrane Society of Korea Conference
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• 1998.10a
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• pp.59-62
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• 1998

1. 서론 : 막내부에서 물질전달을 설명하는 이론으로 현재 solution-diffusion model과 pore-flow model 두 가지가 있다. 이 중에서 흡착, 확산, 탈착의 3과정을 거치는 solution-diffusion model이 주로 사용되고 있다. 본 연구에서는 solution-diffusion model 에서 상호확산계수를 구하기 위해서 Vrentas-Duda식을 이용하여 자기확산계수를 구하고 Bearman식으로부터 상호확산계수를 구하는 과정을 UNIFAC-FV와 modified UNIFAC-FV을 이용하여 계산하였으며 Flory-Huggins식을 이용한 기존방법과 비교하였다.(생략)

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.796-798
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• 2005

본 논문에서는, 부하 분산의 대표적인 기법들 중에서 빠른 부하 분산을 수행하지만 workload의 이동 횟수가 많은 diffusion method와 느린 부하 분산을 수행하지만 workload의 이동 횟수가 매우 적은 messor의 두 가지 방식을 집합을 기반으로 하는 확산 전송 방식으로 융합하여, 효과적으로 부하 분산을 수행할 수 있는 기법을 제안한다. 또한 실험을 통하여, 제안된 기법이 부하 분산치 속도와 workload의 이동 및 이동을 위한 메시지의 증가 사이에서 적절한 trade-off를 제공하는 것을 보인다.