• Journal of Korea Foundry Society
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• v.21 no.1
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• pp.33-40
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• 2001

Among the many techniques available to synthesis metal matrix composites, liquid phase processing, especially, conventional casting process such as stir-casting process is particularly attractive for their simplicity, economy and flexibility, In the present study, A356/20%SiCp composites were fabricated by gas-particle co-injection method. The gas-particle co-injection method is a modified stir-casting method and the corporation of particle could be improved by acceleration of particles due to rotation of impeller and gas purging. The microstructures and mechanical properties such as tensile properties and resistance to wear of fabricated materials were examined. Further, the particle injection mechanism in gas-particle co-injection method was discussed.

• KDI Journal of Economic Policy
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• v.15 no.1
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• pp.87-116
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• 1993

전세제도(傳貰制度)는 공공임대주택(公共賃貸住宅)이 존재하지 않고 제도금융권의 주택금융이 미약한 상황에서 유지되어 온 우리나라 특유의 주거점유형태(住居占有形態)이다. 그러나 불완전한 우리의 주택시장 여건하에서 전세임대차(傳貰賃貸借)에 따르는 위험부담이 임차자(賃借者)에게 전가되는 등 불필요한 사회적 비용을 초래하고 있다. 따라서 현존의 전세제도(傳貰制度)를 개선하기 위하여 공공임대주택(公共賃貸住宅)을 늘리고 월세전환(月貰轉換)으로의 유인책을 제공하여야 한다. 아울러 20조(兆)원이 넘는 전세보증금(傳貰保證金)을 주택부문 자금으로 쓸 수 있도록 전세기금(傳貰基金)을 설치하는 등 전세제도(傳貰制度)를 개선하여야 한다. 종국적으로 전세제도(傳貰制度)가 사라지더라도 사회 일각에서 우려하는 저축감소효과는 거의 없을 것이다.

• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.334-335
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• 2003

현재 기지국과 중계기 사이의 광선로에 사용되고 있는 1310 nm와 1550 nm 파장이외에 OADM (optical add-drop multiplexer)을 사용하여 새로운 2개 파장을 광선로에 추가로 연결함으로써 광선로 임차사용의 효율을 증대시키는 4파장 광중계기의 구현시 drop신호는 삽입손실 ­3 dB 이하의 저손실특성이 요구되며 isolation 신호는 통상 ­40 dB 이상의 고품질이 요구된다. 그러나 이와같은 성능의 광모듈을 실제로 구현하기 어렵다. 따라서 많은 광결합 부품의 조합을 통해서도 drop또는 isolation 특성은 4파장 광중계기를 실용화하기 어려울 만큼 저하된다. (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.103-104
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• 2002

산업의 발달에 따라 국내에 유통되는 화학물질의 종류 및 취급량이 최근 급증하고 있으며 이에 비례해서 유해화학물질과 연관된 사고 사례도 매년 증가하고 있다(산업자원부, 2001). 이러한 화학사고의 체계적인 대응을 위해 국립환경연구원의 화학물질안전관리센터에서는 2002년 초부터 주요 화학 공단을 중심으로 국가차원의 실시간 화학물질 사고대응 정보시스템 (CARIS : Chemical Accident Response Information System)을 구축하여 유해화학물질을 체계적으로 관리·운영하고 있다 (국립환경 연구원, 2002). (중략)

• Journal of Families and Better Life
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• v.20 no.1
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• pp.57-64
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• 2002

The purpose of this study is to estimate the residential satisfaction, and to present the direction of the policy to elevate it. A housewife living in the rental apartment in Gwangju completed a structured questionnaire under the guidance of her interviewer. The Questionnaires used in this study were 305. The major findings were as follows : 1 . Degree of the residential satis(action of housewives living in the rental apartment in Gwangju was not high. 2. The significant variables that influenced on the overall residential satisfaction were existence of the delegation of borrowers, cognition of the law for the rental house. In future research, the index to represent the real participation of borrowers have t\ulcorner be made and the variables related the residential satisfaction have to be sought respectively.

• Journal of the Korean Society of Safety
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• v.16 no.2
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• pp.63-68
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• 2001

In this study the main elements which can be commonly adopted to every kind of business are selected through the research, case-study, benchmarking common items of a direct or indirect loss cost. As a result of the development of a program for evaluating loss cost a case or accumulated data can be easily managed through estimating the direct and indirect loss cost as tell as the ratio between directs and indirect cost. The program is fit to case-study and we are compared direct cost with indirect cost. Automatically, this program showed ratio between directs and indirect cost for style, scale of accident The person in charge of safety and hygiene can have better chances to get into management also the owner or the CEO can recognize the importance of management of safety and hygiene. So this can guide the company to invest in a prevention of disaster and to adopt a safety and hygiene management promote the prevention activity of a company, and finally decrease the accident rate in the country.

• Journal of the Korean Society of Safety
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• v.16 no.2
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• pp.69-74
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• 2001

In this study, we analyzed the accident scenarios of chemical plants through the analysis of lots of chemical accidents and using experts knowledge, and looked into the method of prevention and response. Moreover, we developed a systemic and actual Emergency Response Plan Software(ERPS) that could prevent, prepare and respond totally for the chemical industry facilities using the data from the accident effect estimation from the local society and the geographic information of a chemical plant. The ERPS consists of the information for the plant and process, the consequence analysis and the ERPTA(Emergency Response Plan Tree Analysis). In conclusion, the program developed in this study could help effectively all the chemical industry facilities to prevent and respond to possible accidents.

• Journal of the Korean Geographical Society
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• v.35 no.2
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• pp.295-306
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• 2000

본 연구는 삶의 질에 관한 관점을 우리 나라 도시저소득층의 주거실태를 중심으로 살펴보고자 한다. 이를 바탕으로 주거빈곤층의 삶의 질 향상을 위한 발전대안을 모색하도록 한다. 국내외 거의 모든 ‘삶의 질’선행연구에 있어 중요한 지표로서‘주택’,‘주거환경’,‘주거장소’등 주거에 관한 상이 포함되어 있다. 즉 삶의 질 연구에 있어 주택 및 주거환경은 가장 기본적이고 필수적 요소임을 확인할 수 있다. 주거빈곤을 기능적 측면, 경제적 측면, 최저주거기준 측면, 그리고 주거권 측면에서 분석하고, 한국의 주거빈곤실태를 파악하였다. 특히 서울을 비롯한 대도시의 주거빈곤층은 달동네.산동네라 불리는 불량주거지, 비닐하우스, 쪽방 등에 거주하며, 이들은 주로 주택점유 형태상 전세, 보증부월세, 월세 등의 임차가구의 대부분을 차지한다. 삶의 질과 주거환경개선을 위한 발전대안 모색을 위해 주거분야 ‘삶의 질 지표’를 제안하였다. 지표의 내용으로 주택 그 자체뿐 아니라 주거기능이 원활하도록 하는 공공서비스, 안전 등의 광의적 접근이 필요함을 강조하였다. 아울러 삶의 질에 관련된 정책과제를 해결하기 위해서는 적어도 네 가지 부문(정부, 민간부문, NGO/CBO, 주민)별 각자의 역할을 강조하였다.

• Journal of Broadcast Engineering
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• v.8 no.4
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• pp.501-504
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• 2003

In this out watermarking method, a key is determined by quantizing the maximum motion difference between frames. We have a problem the key value for embedding and detection are different in 1 to 3% frames of all frames. This problem can be easily solved by using a new key according to bit error rate of the extracted watermark. Since the watermark is embedded in each frame nth different keys and detected In all the frames, out method is resistant against attacks such as the frame averaging and frame drop.

• Korean Journal of Materials Research
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• v.17 no.10
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• pp.521-525
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• 2007

The microstructure and mechanical properties of an oxygen free copper processed by accumulative roll bonding(ARB) at low strain rate were studied. The copper sheets were highly strained up to an equivalent strain of ${\sim}6.4$ by ARB process at ambient temperature. The strain rate of the copper during the ARB was $2.6sec^{-1}$. The microstructure and mechanical properties of the ARB-processed copper were compared to those of the specimens processed by ARB at relatively high strain rate ($37sec^{-1}$). The microstructure and mechanical properties of the copper with ARB process was very similar to each other despite of some differences in recovery.