• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.470-475
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• 2011

The objective of this study is the developement health & disaster monitoring measurement using ubiquitous active communication digital datalogger system for monitoring measurement of railway construction sites. For the replacement of current passive data communication, ubiquitous active communication digital datalogger system is studied for the first time with in a country. Therefore data communication method and analyzing program of automatic measurement data is developed for the global positioning automatic digital datalogger system. The results of this study will be using both real time automatic monitoring measurement and health & disaster monitoring measurement of railway structures.

• 정보보호학회논문지
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• 제19권6호
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• pp.113-119
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• 2009

최근 국내는 전자정부 인터넷 뱅킹 포털 등 대부분의 웹 사이트에서 다양하고 동적인 온라인 서비스 제공을 위해 ActiveX Control을 개발 배포하고 있다. 하지만, 안전성이 검증되지 않은 ActiveX Control은 인터넷 사용자들에게 심각한 보안위협요소가 될 수 있다. 최근 이러한 취약한 ActiveX Control로 인한 해킹 사고가 급격히 증가되고 있음에도 불구하고, 개인 PC 보안의식에만 의존할 뿐 이에 대한 국가적인 보안정책이나 대책이 마련되어 있지 않다. 이에, 본 논문에서는 ActiveX Control 개발 배포 사용의 3가지 측면 모두에서 안전하고 효율적인 보안관리가 가능한 보안인증을 통한 ActiveX Control 보안관리 모델 설계를 위한 기술적 방법론을 제안하고자 한다.

• 가족자원경영과 정책
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• 제7권1호
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• pp.77-89
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• 2003

This study examines factors to influence consumers’reliability, and satisfactions for consumer anti-site, and willingness to visit that site again among consumers utilizing anti-sites. According to the results of this study, first, male, consumers utilizing electronic commerce were more likely to visit anti-site. Consumers were more likely to write their own message and reply other consumers’message in anti-site when they have purpose to complain about their dissatisfaction regarding the process of purchase behavior. Second, consumer's satisfaction is higher in cases of consumers having higher recognition of necessity of anti-site, visiting not required to affiliate the members of anti-site, and being reliable sites. Third, consumers were more likely to use anti-site again when they had higher recognition in the necessity of anti-site and were more satisfied. Finally, in order to facilitate the utilization of anti-sites, those solutions include systematic classification and management of writings listed in the site, active management of the site managers, solutions for criticisms on the writings listed and lack of objectivity of information provided, and active searches for solutions rather than listing of writings on discontents and resistance.

• 전기화학회지
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• 제7권4호
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• pp.167-172
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• 2004

3,4-dihydroxybenzaldehyde(3,4-DHB) was oxidatively el electropolymerized on glassy carbon (GC) electrodes to prepare CC/p-3,4-DHB type electrodes, which were subsequently modified with 3,4-dihydroxybenzoic acid(3,4-DHBA) using 0.05M HCI as a catalyst. The esterification reactions were performed between -OH sites on the polymeric film surface of the p-3,4-DHB and the -COOH sites within the 3,4-DHBA molecules in solution. These reactions had a rate constant value of $1.1\times10^{-1}\;s^{-1}$ for the esterification step as obtained from the first-order rate constant in the solution. The electrochemical responses of the GC/p-3,4-DHB-3,4-DHBA electrodes exert an influence upon the buffer solution, its pH and applied potential ranges. The redox process of the electrode was more easily controlled by charge transfer kinetics than that of the CC/p-3,4-DHB. The modified electrodes had redox active sites that were 10 times more active than those present before modification. The electrical admittance of the modified electrodes was also three times higher than that of the unmodified electrodes. After being annealed in ethanol for 20 hrs the electrodes brought about a 3.3 times greater change of water molecules in the redox reaction. The modified electrodes are stable in the potential range of 0.4 to 0.55V.

• Tuberculosis and Respiratory Diseases
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• 제48권6호
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• pp.879-886
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• 2000

연구배경: 폐특이 전사조절 유전자인 Thyroid Transcription Factor-1 (TTF-1)유전자는 폐에 선택적인 유전자의 표현의 조절에 중요한 전사인자로 작용하고 폐의 발생에서 morphogenic protein으로서 작용한다. 그러나 현재까지 이 TTF-1 유전자의 전사인자에 대한 연구는 거의 미미하다. DNase 1 hypersensitive(DH) regions은 활동적인 염색체에 대한 중요한 표식자이며 유전자를 조절하는 많은 DNA sequences와 밀접한 관계가 있다. 방법 : 추정적인 distal regulatory elements를 밝혀 내기 위해서 TTF-1을 표현하는 인간의 폐선암 세포주인 NCI-H441을 사용해 DNase 1 hypersensitive site assay를 이용하였다. 결과 : TTF-1 유전자에는 전사의 시작부위에서 +150, -450, -800, 그리고 -1500 base pair부위에 4곳의 DH sites가 있음을 할 수 있었다. 결론 : 이상의 결과로 전사 조절부위가 TTF-1 유전자 내에 그리고 5' prime부위에 위치함을 추정할 수 있었다.

• 공업화학
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• 제5권2호
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• pp.357-360
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• 1994

V-silicalite의 활성점을 표현하는 몇 가지 분자 cluster모델에 대하여 CNDO/2 계산을 수행하고 Wiberg결합차수와 LUMO에너지 및 전체에너지를 얻었다. 제안된 각 모델 분자들의 B산성도는 O-H결합의 결합차수를 통해 조사하였다. 또한 계산으로부터 구한 LUMO에너지는 각 활성점 모델의 L산성도를 나타내었다. 각 cluster모델의 구조적 안정성은 전체에너지를 통해 설명하였다.

• 한국생활과학회지
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• 제16권4호
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• pp.783-800
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• 2007

This study examined the evaluation on the consumers' voluntary anti-sites on on-line from the people concerned, such as the people of an enterprise, a consumer organization, and the consumer. We collected the data using in-depth interview of qualitative analysis. The in-depth interviews were carried out for about two hours in each respondent. Total 15 respondents, 5 in each part of three parts such as an enterprise, a consumer organization, and the consumer, were answered a interview. The data was analysed by content analysis method. As the result of this study, the people concerned to enterprises answered that anti-sites helped the enterprises through the objective and the constructive criticism. The consumers participating in the anti-sites also answered that the existence of anti-sites helped the companies to know the complaint and the dissatisfaction with their goods or services. We suggest the followings for the desirable consumers' voluntary anti-sites through this study. First, the companies need to recognize that the anti-sites help the companies because the anti-sites give the companies the information of improving the product and the corporate management. Second, people concerned to the consumer organizations need to take a neutral role so that the consumer members of anti-sites demand a proper compensation to the companies and receive the reasonable compensation. Third, the anti-sites' managers should give information to the consumer members of the anti-sites continuously, operate the anti-sites actively such as answering a question and managing their members. Fourth, the consumer members of anti-sites should have active attitude in participating in an anti-sites from exchanging various information to uploading their information.

• 한국재료학회지
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• 제30권5호
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• pp.217-222
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• 2020

The design and fabrication of catalysts with low-cost and high electrocatalytic activity for the oxygen evolution reaction (OER) have remained challenging because of the sluggish kinetics of this reaction. The key to the pursuit of efficient electrocatalysts is to design them with high surface area and more active sites. In this work, we have successfully synthesized a highly stable and active NiCo₂S₄ nanowire array on a Ni-foam substrate (NiCo₂S₄ NW/NF) via a two-step hydrothermal synthesis approach. This NiCo₂S₄ NW/NF exhibits overpotential as low as 275 mV, delivering a current density of 20 mA cm^-2 (versus reversible hydrogen electrode) with a low Tafel slope of 89 mV dec^-1 and superior long-term stability for 20 h in 1 M KOH electrolyte. The outstanding performance is ascribed to the inherent activity of the binder-free deposited, vertically aligned nanowire structure, which provides a large number of electrochemically active surface sites, accelerating electron transfer, and simultaneously enhancing the diffusion of electrolyte.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.35-35
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• 2010

Understanding the mechanistic details of heterogeneous catalytic reactions will provide a way to tune the selectivity between various competing reaction channels. In this regard, catalytic decomposition of alcohols over the rutile $TiO_2$(110) surface as a model oxide catalyst has been studied to understand the reaction mechanism employing the temperature-programmed desorption (TPD) technique. The $TiO_2$(110) model catalyst is found to be active toward alcohol dehydration. We find that the active sites are bridge-bonded oxygen vacancies where RO-H heterolytically dissociates and binds to the vacancy to produce alkoxy (RO-) and hydroxyl (HO-). Two protons adsorbed onto the bridge-bonded oxygen atoms (-OH) readily react with each other to form a water molecule at ~500 K and desorb from the surface. The alkoxy (RO-) undergoes decomposition at higher temperatures into the corresponding alkene. Here, the overall desorption kinetics is limited by a first-order decomposition of intermediate alkoxy (RO-) species bound to the vacancy. We show that detailed analysis on the yield and the desorption temperatures as a function of the alkyl substituents provides valuable insights into the reaction mechanism. After the catalytic role of the oxygen vacancies has been established, we employed x-ray photoelectron spectroscopy to further study the surface electronic structure related to the catalytically active defective sites. The defect-related state in valence band has been related to the chemically reduced $Ti^{3+}$ defects near the surface region and are found to be closely related to the catalytic activity of the $TiO_2$(110) surface.

• Bulletin of the Korean Chemical Society
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• 제26권12호
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• pp.1911-1920
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• 2005

Effective artificial metalloproteases have been designed by using cross-linked polystyrene as the backbone. Artificial active sites comprising Cu(II) complexes as the catalytic site and other metal centers or organic functionalities as binding sites were synthesized. The activity of Cu(II) centers for peptide hydrolysis was greatly enhanced on attachment to polystyrene. By placing binding sites in proximity to the catalytic centers, the ability to hydrolyze a variety of protein substrates at selected cleavage sites was improved. Thus far, the most advanced immobile artificial proteases have been obtained by attaching the aldehyde group in proximity to the Cu(II) complex of cyclen.