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최병석,오지훈,한성국 한국컴퓨터교육학회 2003 컴퓨터교육학회 논문지 Vol.6 No.4
대부분의 웹 기반의 교육 시스템은 교육 정보 제공에만 중점을 두고 있다. 웹이 점차 교육 정보를 제공하는 보편적인 기반이 되어 감에 따라서, 웹은 이제 정보 제공의 차원을 넘어 다양한 서비스를 제공하는 플랫폼으로 변모하고 있다. 이에 새롭게 변화된 웹 환경에 맞는 교육 서비스 모델이 시급히 요청되고 있다. 본 논문에서는 기존의 웹 기반 교육의 여러 한계성을 해결하기 위하여 새로운 기능형 중재자 기반의 교육자원 서비스 모델을 제시하고자 한다. 본 논문의 기능형 중재자기반의 교육자원 서비스 시스템은 웹상에 산재되어 있는 교육 자원들을 효율적으로 관리하고 사용자의 요청에 맞는 교육 서비스 정보를 제공하여 줌으로써, 교육 서비스 자원들의 재사용 효율과 생산성을 높일 수 있다 Most of web-based education systems are only to supply education information. As the web becomes the common basis to support the effective education, it is used for not only applying education information but also developing to the dimension to provide various services. The education service models prospering to the newly diverse environment are necessary. In this paper, a education resource service system based on functional broker is implemented to overcome the weakness of the traditional Web-based instruction. This paper shows that the web-based education service system such as functional broker can manage the varied education resources efficiently and so contribute to realize the life-long education.
참깨에서 추출한 Sesamin 섭취가 혈청 지질 농도에 미치는 영향
윤명호,신준한,김한수,탁승제,최병일 아주대학교 1997 아주의학 Vol.2 No.2
Objectives : High serum cholesterol is one of the major risk factors of coronary artery disease. We investigated the lipid-towering property and the side effects of sesamin, an unsaturated fatty add extracted from sesame oil, for the primary prevention of coronary artery disease. Methods : The 37 patients (20 mates and 17 females) with hyperlipidemia, ages ranging from 22 years to 70 years old (48±12), who did not have atherosderotic diseases except essential hypertension were given three capsules of sesamin once daily for 6 weeks. The lipid profile of the patients were examined before and after sesamin treatment, and the patients were grouped according to the presence or abscence of hypertension, smoking habit and obesity. Result : Compared with pretreatment, the total cholesterol level of sesamin treated group decreased significantly (254.2±29.6 versus 241.6 34.0 ㎎/dl, p< 0.05). The level of LDL-cholesterol (162.6±24.3 versus 156.6±32.8 ㎎/dl)HDL- cholesterol (47.5±10.0 versus 47.0±8.7 ㎎/dl) and triglyceride (196.5±95.4 versus 179.3±96.7 ㎎/dl) and the ratio of LDL/HDL- cholesterol (3.6±0.9 versus 3.4±0.9) were not significantly different. The effect of cholesterol lowering property of sesamin was predominant in hypertensive, non- smoking and obese group (P< 0.05 vs pretreatment). The laboratory tests including complete blood cell counts, serum transaminases, total protein, albumin, blood urea nitrogen, creatinine and blood glucose did not change significantly. Conclusion : The lipid lowering effect of sesamin was statistically significant on the total cholesterol particularly with obese, non-smoking and hypertensive patients. There was no significant side effect during sesamin administration. Therefore, three capsules of sesamin as a single daily dose were effective in lowering total cholesterol and safe to administer in patients with hyperlipidemia.
정전 열 접합을 이용한 Multi-Substrate Bonding
이덕중,주병권,최우범,한정인,조경익,이광배,장진,오명환 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
We performed silicon-to-glass bonding using silicon direct bonding followed by anodic bonding(SDAB). Initial bonding between glass and silicon was caused by the hydrophilic surfaces of silicon and glass ensemble using silicon direct bonding(SDB) method. We found that the bonded specimen using SDAB process had higher strength than one using anodic bonding process only. We performed multiple layer bonding by SDAB, which is glass- silicon -glass as sandwich structure. In the silicon wafer, the (1mm x 2mm x 500μm)-sized cavity was formed by the anisotropic etching of the silicon substrate in EPW(Ethylendiamin-Pyrocatechol-Water). And, the cavity was sealed with glass wafers by SDAB method.
Choi, Byeong-Ryoel,Jo, Hyo-Jae,Choi, Han-Sik,Ha, Sung-Yeol,Park, Young-Ho Korean Society of Ocean Engineers 2017 Journal of advanced research in ocean engineering Vol.3 No.4
The Korea Offshore Wind Power (KWOP) cooperation is planning to construct offshore wind energy farms with an overall rated power of 2.5 GW along the southwestern coast by 2019. Hitherto, various structural types of support structures for offshore wind turbines have been being proposed, but these structures have lacked economic analysis studies. Therefore, their economical superiority to existing types has been difficult to guarantee. An offshore structure with economic efficiency will have a minimum amount of mobilizing equipment and short offshore construction period because of the application of rapid installation methods. Thus, the development of a new support structure with economic efficiency is generally considered to be necessary. Accordingly, this paper proposes a newly developed and more economical jacket type for the offshore support structure. This study confirmed its structural safety and performance by conducting a structural analysis and eigenvalue analysis. The manufacturing and installation costs were then estimated. As a result, the new jacket type of offshore support structure proposed in this study significantly reduced the manufacturing and installation costs. Therefore, it is expected that the proposed jacket will contribute to reducing construction expenses for new wind power farms and invigorating wind power farm businesses.
Han, Yoon Soo,Kim, Hoyoung,Choi, Byeong Dae,Kwon, Younghwan,Hur, Youngjune,Kwak, Giseop,Kim, Soon Hak,Park, Lee Soon,Choi, Byeong-Dae TaylorFrancis 2007 Molecular Crystals and Liquid Crystals Vol.470 No.1
<P> A dopant, 4,4'-bis(dimethyl[4-(2-phenyl-buta-1,3-dienyl)phenyl]amine) biphenyl (BPAB), was synthesized, and single layered polymer light emitting diode (PLED)s, ITO/Host:Dopant/Al, were fabricated with blends of poly(vinyl carbazole) (PVK) as host and BPAB as dopant. The electroluminescence (EL) was observed in doped PLEDs. From the EL and photoluminescence (PL) spectra, the existence of energy transfer from host to dopant was verified. With increasing content of dopant (BPAB), blue emission originated from PVK reduced, but didn't completely disappear, suggesting inefficient energy transfer from PVK to BPAB. When the content of BPAB was 15 wt%, yellow green emission from PLED was observed due to partial energy transfer from PVK to BPAB.</P>
Green Emitting PLED Having Polymeric Host and Dopant in Emissive Layer
Han, Yoon Soo,Kim, Hoyoung,Choi, Byeong Dae,Song, Jeong Han,Kwon, Younghwan,Hur, Youngjune,Kwak, Giseop,Kim, Soon Hak,Park, Lee Soon,Choi, Byeong-Dae TaylorFrancis 2007 Molecular Crystals and Liquid Crystals Vol.470 No.1
<P> Poly(1,1'-biphenyl-4,4'-ylene vinylene-alt-2,5-bis(2-ethylhexyl)-1,4-phenylene vinylene] [poly(BPV-alt-BEHPV)] as a polymeric dopant, was synthesized by Honer-Emmons condensation from corresponding dialdehyde and diphosphonate monomers. Synthesized alternating polymer was used to fabricate single layer (ITO/Host:Dopant/Al) PLEDs with poly(vinyl carbazole) (PVK) as a host. Conjugated poly(BPV-alt-BEHPV) showed green emission from single layer ITO/poly(BPV-alt-BEHPV)/Al device. Emission colors from doped PLEDs were changed by energy transfer from blue originated from PVK to green with increasing the content of poly(BPV-alt-BEHPV).</P>