• Journal of Biosystems Engineering
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• 제27권3호
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• pp.241-248
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• 2002

An electronic noses system including six metal oxide sensors was used to predict the characteristics of shelf-life of soybean curd. Soybean curd was stored at two different temperatures defined as low temperature(5$\^{C}$) and high temperature(25$\^{C}$). Resistance changes of the sensors were measured 13 times for 19 days at low temperature and 19 times for 120 hours at high temperature. Three different analytical methods such as graphical analysis(GA), principal component analysis(PCA), and cluster analysis(CA) were used to analyze sensors outputs. The ratio of resistance was decreased according to increasement of shelf-life. Using PCA it was possible to predict freshness and shelf-life time of soybean curds. Also, using CA it was possible to simplify an electronic nose system. Electronic nose system could be an efficient method to predict shelf-life and to evaluate quality in foods.

• 한국기록관리학회지
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• 제12권3호
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• pp.29-46
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• 2012

전자기록물에 포함된 첨부 파일의 포맷을 이해하지 않은 상태의 전자 기록은 이해할 수 없는 일련의 비트에 지나지 않으므로 기록물을 장기 보존하기 위해서는 포맷의 다양성과 소멸 가능성에 대응할 수 있도록 포맷 정보를 관리하여야 한다. 본 연구에서는 다양한 형식의 전자파일(MS 오피스 계열(PPT, DOC, XLS, PPTX, DOCX, XLSX), HWP, PDF, GIF, JPEG, PNG, TIFF 등)을 육안으로 확인하지 않고, 전자파일 헤더에서 포맷 정보를 추출하여 파일 확장자와 비교하는 포맷검증 도구와 디지털컴포넌트의 유효성을 검사하는 도구를 개발하였다.

• 동아시아식생활학회지
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• 제18권1호
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• pp.14-21
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• 2008

Flavor is one of the most important factors for determining wine characteristics and quality. Flavor pattern of wines(brewed from America, France, Italy, Chile, and Australia) was analyzed by the electronic nose that is equipped with 12 metal oxide sensors. In the results, the flavor pattern of wines was discriminated according to their origins by the principal component analysis(PCA). Each proportion of the first principal component score in the PCA plot was 94.79%(America), 73.62%(France), 99.06%(Italy), 96.74%(Chile), and 96.53%(Australia), respectively. Consequently, the imported wines could be practically differentiated into one from the other origins by volatile properties, suggesting that electronic nose could be successfully used for easy screening and quality evaluation of wines.

• 한국식품과학회지
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• 제35권4호
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• pp.648-652
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• 2003

본 실험은 순수참기름과 혼합참기름의 구별 및 순도판별을 용이하게 하기 위한 분석방법을 제시하고자 실행되었다. 순수참기름과 옥수수기름을 95 : 5, 90 : 10, 80 : 20(w/w)의 비율로 각각 비율을 달리해서 혼합참기름을 제조한 후 GC, SPME-GC/MS, 전자코를 이용한 분석을 실시하였다. 지방산조성(mole%)을 비교한 결과 옥수수기름이 10%이상 함유된 혼합참기름과 순수참기름 간에는 stearic acid와 linoleic acid의 함량의 변화로 구별이 가능하였으나 5%내로 옥수수유가 함유된 혼합참기름과 순수참기름과의 구별은 용이하지 않았다. 향기성분동정을 위해 SPME-GC/MS 분석을 실시한 결과순수참기름과 혼합참기름은 같은 향기성분 패턴을 보여 구별하기 어려웠다. 반면, MOS 유형의 전자코를 이용하여 향기성분패턴 분석결과 제1주성분 값의 기여율이 98.76%로 구별이 가능하였으며 이로써 신속하고 편리하게 비파괴적 분석 방법인 전자코를 활용하여 순수참기름과 혼합참기름을 구별할 수 있었다.

• 정보처리학회논문지D
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• 제11D권5호
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• pp.1095-1104
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• 2004

인터넷과 인트라넷 기반의 전자적 서비스를 통해 비즈니스 거래가 전자상거래 공간에서 보다 유용하고 확장된 비즈니스 개념들을 제공하게 하였다. 특히, 컴포넌트 기반 e-비즈니스 기술은 시스템과 응용 레벨 모두에서 e-비즈니스 이슈들을 해결하는 방향이 되고 있다 컴포넌트 기반시스템은 네트워크 간의 상호동작성, 여러 네트워크 환경들간의 이동성 등의 특성을 포함한다. 따라서, 전통적인 프로세스와 개발 모델들은 빠르게 변화하는 환경에 부적절한 구조를 가지므로, e-비즈니스 응용 개발자들은 컴포넌트 기반 웹 응용을 개발하기 위한 메커니즘으로 웹서비스기술을 시도하고 있다. 본 논문에서는 e-비즈니스 시스템을 구축하기 위하여 웹서비스 기반의 e-비즈니스 시스템 아키텍처에 특히 초점을 맞추고, 다양한 상황에서 e-비즈니스 도메인에 적용하기 위한 설계패턴을 식별하고 명세화한다. 또한 제안된 프로세스를 적용하여 e-비즈니스 응용을 위한 컴포넌트들을 개발하도록 프로토타입과 프레임워크를 연구하고 CAS(Customer Authentication system)을 개발하는 사례를 보여준다. 끝으로, e-비즈니스에서 컴포넌트 기반 개발 방향을 보여줄 것이다.

• 한국컴퓨터산업교육학회:학술대회논문집
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• 한국컴퓨터산업교육학회 2003년도 제4회 종합학술대회 논문집
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• pp.59-64
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• 2003

Principal component analysis(PCA) and neural network(NN) are used in reducing external noise in magnetocadiography. The PCA technique turns out to be very effective in reducing pulse noise in some SQUID channels and the NN find noise component automatically. Some experimental results obtained from 61 channel MCG system are shown.

• Journal of the Optical Society of Korea
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• 제16권3호
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• pp.215-220
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• 2012

In an earlier work, we proposed the chromatic dispersion monitoring technique of non-return to zero (NRZ) signal based on clock-frequency component (CFC) through numerical simulations. However, we have not yet shown any experimental demonstration or analytic derivation of it. In this paper, we show an experimental demonstration and analytic derivation of the proposed chromatic dispersion monitoring technique. We confirm that the experimental results and the analytic results correspond with the simulation results. We also demonstrate that monitoring range and accuracy can be improved by using a simple clock-extraction method.

• 한국신뢰성학회지:신뢰성응용연구
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• 제5권2호
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• pp.241-259
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• 2005

The environmental problem is a main subject of the 21C and an environment destruction phenomenon by various kinds of environmental materials is reaching serious level. Nations to be classified as the environmental developed country, are born again environmental rich country. And they earn a large income by trade Every kind environmental resource in an international commercial transaction. Especially, the study that a reliability assessment method to prevent to reliability problem to be happened when the solder lead(lead-free solder), non-cd component, non-bromide component(without the polybrominated biphenyls(PBB) and polybrominated diphenyl ethers(PBDE))and hexavalent chromium(Cr VI) clearance component and mercury-free applied to electronic equipment is progressed. As the result of the study for applying of a reliability assessment technique of lead-free solder that recognized the most of urgent problem at the company, combination accelerated life test could taken by adding and appling the part of a humidity acceleration part to Eyring Model which is proposed by R.E.Thomas. The reliability assessment methods study of PWB clean environmental materials is expected to respond to a reliability elevation and environmental material regulation policy spreading all over the world by beginning form Europe.

• 한국전기전자재료학회논문지
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• 제16권6호
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• pp.538-548
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• 2003

We studied effects by Re$_2$O$_3$(R=Dy, Gd, Ho) addition on the properties of Mn-Zn ferrite. The doping concentration range from 0.05 wt% to 0.25 wt%. All samples were prepared by standard fabrication of ceramics. With increasing the rare earth oxides, specific density and initial permeability increased on the whole. But, the tendencies such as upper result had the measured value on limitation and characteristics saturated or decreased properties after that. In case of excessive addition of additive beyond some level, initial permeability properties of ferrite have gone down in spite of anomalous grain. With increasing the content of additive, both the real and imaginary component of complex permeability and the magnetic loss (tan$\delta$) increased. Because the increased rate of real component had higher than imaginary component, magnetic loss increased none the less for increasing the real component related with magnetic permeability. But, the magnetic loss of ferrite doped with the rare earth oxides was lower than that of Mn-Zn ferrite at any rate. The small amount of present rare earth oxides in Mn-Zn ferrite composition led to enhancement of resistivity in bulk, and more so in the grain boundary. It was seem to be due to the formation of mutual reaction such as between iron ions and rare earth element ions.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2005년도 학술발표대회 논문집
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• pp.393-404
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• 2005

The environmental problem is a main subject of the 21C and an environment destruction phenomenon by various kinds of environmental materials is reaching serious level. Nations to be classified as the environmental developed country, are born again environmental rich country. And they earn a large income by trade Every kind environmental resource in an international commercial transaction. Especially, the study that a reliability assessment method to prevent to reliability problem to be happened when the solder lead(lead-free solder), non-cd component, non-bromide component(without the polybrominated biphenyls(PBB) and polybrominated diphenyl ethers(PBDE))and hexavalent chromium(Cr VI) clearance component and mercury-free applied to electronic equipment is progressed. As the result of the study for applying of a reliability assessment technique of lead-free solder that recognized the most of urgent problem at the company, combination accelerated life test could taken by adding and appling the part of a humidity acceleration part to Eyring Model which is proposed by R.E.Thomas. The reliability assessment methods study of PWB clean environmental materials is expected to respond to a reliability elevation and environmental material regulation policy spreading all over the world by beginning form Europe.