• Textile Coloration and Finishing
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• v.8 no.6
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• pp.9-26
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• 1996

이 연구의 목적은 에틸렌이민 유도체를 갖는 아조계 분산 염료의 나일론 6.6 섬유에의 응용과 최적화된 폴리에스테르 및 나이론 극세사 섬유 염색 조건의 확립이다. 세가지 아지리디닐 모노 아조 염료와 이들 염료의 가수분해 된 형태 그리고 디메틸아닐린계 아조 염료의 폴리에스테르 및 나일론 6.6 극세사 섬유에 대한 염색 및 견뢰도 성질이 조사되었다. 염색 조건 중 pH의 변화에 따른 섬유상의 염착량 변화 조사에서 뚜렷한 경향을 얻을 수 없었으며, 이는 극세사 섬유의 물리적 성질이 두드러지게 착용한 이유라 여겨진다. 염색된 폴리에스테르 극세사 섬유상에서, 아지리디닐 염료는 이들의 가수 분해된 형태 그리고 디메틸아닐린계 아조 염료의 비교하여 개선된 견뢰도 성질을 나타내었다. 아지리디닐 아조 염료의 나일론 극세사 섬유 염색 시 pH 증가에 따라 세탁 및 광견뢰도가 개선되었고, pH8의 염색 조건에서 최적 견뢰도 개선을 나타내었다. 아지리디닐 아조 염료가 이들 염료의 가수분해 된 형태 그리고 디메틸아닐린계 아조 염료와 비교하여 폴리에스테르 및 나일론 섬유상에서 보다 개선된 견뢰도 성질을 나타내었고 이는 섬유와 염료간의 공유 결합으로 기인한 것으로 여겨진다.

• Journal of the Korean Institute of Intelligent Systems
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• v.22 no.1
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• pp.94-99
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• 2012

This paper discusses a decentralized sampled-data control problem for large-scale nonlinear systems. The system is represented in Takagi-Sugeno's form. Next, we design a decentralized analog controller based on the overlapping decomposition technique. The final step is to apply the intelligent digital redesign scheme for converting the analog controller into the sampled-data one. Design condition is represented in terms of linear matrix inequalities. A simulation result is provided for the effectiveness of the proposed design method.

• The Korean Journal of Financial Management
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• v.15 no.2
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• pp.107-134
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• 1998

한국증권거래소는 1996년 5월 3일부터 KOSPI 200을 대상으로 하는 주가지수선물을 거래하고 있다. 주가지수선물거래가 한국주식시장의 정보효율성에 어떠한 영향을 미쳤을까? Cox(1976)의 주장대로 주식시장의 효율성이 제고되었을까? 이에 대한 대답을 구하기 위해 본 논문에서는 오차수정모형의 구성을 통한 불균형충격반응분석과 예측오차의 분산분해를 이용하여 선물거래가 현물시장의 효율성에 미치는 영향을 직접적으로 검증하였다. 본 논문의 연구결과는 한국주식시장에서 선물거래의 도입 이후에 해외요인과 국내요인으로 대표되는 영구적 효과를 가지는 교란과 일시적 효과를 가지는 고유요인의 교란에 시장가격이 보다 신속히 반응하고 있음을 보여준다. 또한 KOSPI 200은 Non-KOSPI 200에 비해 해외요인의 교란에 보다 민감함을 보여주며, Non-KOSPI 200은 KOSPI 200에 비해 국내요인의 변동에 보다 민감하게 반응함을 보여준다. 고유교란에 대한 KOSPI 200과 Non-KOSPI 200의 반응은 선물거래의 도입 이후에 교란에 대한 반응속도가 현저히 빨라졌음을 보인다. 그러나 KOSPI 200과 Non-KOSPI 200간의 차이는 선물거래 도입 이후에 차별적인 변화를 보이지 못하고 있다. 예측오차의 분산분해결과는 전체적으로 선물거래의 도입 이후에 해외요인의 설명력이 커지고, 선물거래가 시장의 정보확산에 긍정적인 역할을 함을 보여준다. 이러한 연구결과는 한국주식시장에서 KOSPI 200 선물거래가 도입된 이후에 현물시장의 정보효율성이 약하나마 향상되었음을 보여주는 것이나 추가적인 연구가 필요함을 말해준다.

• Proceedings of the Korean Fiber Society Conference
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• 1996.10a
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• pp.98-104
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• 1996

• Korean Journal of Food Science and Technology
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• v.47 no.6
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• pp.772-778
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• 2015

Hydrolysis of isolate soybean protein (ISP) using subcritical water (SCW) was conducted to study the feasibility for producing protein hydrolyzate. SCW hydrolysis of SPI suspension (5-15%) was conducted in an electrically heated batch reactor (2 L). The effects of temperature (230 to $270^{\circ}C$) and holding time (10 to 50 min) on the degree of hydrolysis (DH) and the production of amino acids were studied by surface response method. The DH was determined by derivatizing the hydrolyzates with ortho-phthalaldehyde (OPA) solution. It was confirmed that reaction temperature and holding time affected the hydrothermolysis of soybean protein. However, the holding time was less effective on amino acid yield when the temperature was higher than $230^{\circ}C$. In order to achieve optimal yields of amino acids exceeding 43%, the temperature should be within the range between 256 and $268^{\circ}C$ with holding time from 29 to 41 min, respectively. A maximum estimated amino acid yield of 43.5% was obtained at $268^{\circ}C$ for 35 min.

• Journal of Korea Port Economic Association
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• v.26 no.2
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• pp.49-57
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• 2010

This paper examines the relationship between port import from China and macroeconomic variables such as international financial crisis, exchange rate, and industrial production during the period 2000-2009. I employ GPH cointegration methodology since the model must be stationary to avoid the spurious results. The empirical results show that our model is stationary as well as mean-reverting. This paper also applies impulse-response functions to get additional information regarding the responses of the port import to the shocks economic variables such as financial crisis, exchange rate, and industrial production. The results show that the response of port import to exchange rate and financial crisis declines at the first and dies out slowly.

• Journal of Korea Port Economic Association
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• v.30 no.4
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• pp.255-273
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• 2014

The purpose of this paper is to examine the causal relationship among the trading volume of Pyeongtaek port, Incheon Inner Harbor, Incheon North Harbor. Methodologically, Granger causality, impulse response function, and variance decomposition based on VAR are used. The results indicate that Pyeongtaek port trading volume positive shock has positive effects on Incheon North Harbor. In addition, Incheon Inner Harbor trading volumes positive shock has negative effects on Pyeongtaek port. The results also suggest that the volume of Pyeongtaek port Granger-causes the volume of Incheon North Harbor, but not vice versa. The volume of Incheon Inner Harbor Granger-causes the volume of Pyeongtaek port. Based on these results, we suggest that port authorities have to focus on policies that would promote copetition between port of Pyeongtaek and Incheon in the world harbor industry.

• 한국석유지질학회:학술대회논문집
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• autumn
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• pp.68-84
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• 1999

Biodegradation is a natural weathering process by microorganisms to decompose spilled oil or environmental contaminants. To accelerate this process, applying nutrients (fertilizer) or more microorganisms to naturally occurring microorganisms is called 'Bioremediation.' Presently, most popular response technique to spilled oil is mechanical cleanup using booms or skimmers. For the alternative to this technique, chemical dispersants, in-situ burning are used. Another promising alternative is bioremediation and it can clean oil contaminated seashore during enough time. In this paper, types of bioremediation technologies, its usage potential, and important consideration issues when applying this technique were summarized.

• The Transactions of the Korea Information Processing Society
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• v.4 no.6
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• pp.1464-1480
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• 1997

Distributed systems offer environments for attaining high performance, fault-tolerance, information sharing, resource sharing, etc. But we cannot benefit from these potential advantages without suitable management of events/states occurring in distributed systems. These events and states can be symptoms for performance degradation, erroneous functions, suspicious activities, etc. and are subject to further analysis. To properly manage events/states, we need to be able to specify and efficiently detect these events/states. In this paper we first describe an event/state specification language and a centralized algorithm for detecting events/states specified with this language. Then we describe an algorithm for distributing an event/state detection task in a distributed system which is hierarchically organized. The algorithm consists of decomposing an event/state detection task into subtasks and allocation these subtasks to the proper nodes. We also explain a method to make the distributed detection fault-tolerant.

• Journal of the Korea Convergence Society
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• v.9 no.12
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• pp.181-187
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• 2018

The historical consumption of oil dispersant was recorded during the protection plans after huge oil spill occurred in the Gulf of Mexico in 2010. As a well-known oil dispersant, Corexit 9500 was used and continuously blamed for the negative effects on environmental ecology. Nevertheless, US EPA still recognizes Corexit 9500 as a future oil dispersant that might be possibly sprayed again to oil slick. In order to develop alternative oil dispersants, it is important to impel the convergency works mainly from microbiologist, ecologist, environmentalist, chemist, and chemical engineer. In this paper, the major components of Corexit 9500 were introduced by chemical structures and physical properties. Presented were also the biodegradable process of dispersed oils and the possible candidates of biosurfactants.