GPS 동기신호 수신기 개발 : 중간 주파수단과 데이타 추출

홍성일,이수영,박재운,변건식 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2

This paper concerns IF-stage and data recovery as a basic study for home products of GPS receiver. Using a transmission simulator, the same data can be received as transmission simulator transmits. Consequently, it is considered that IF-stage and the part of data recovery operate fairly good and attaching microprocessor control and time interval counter to this system will operate better. It can be expected that providing the system with RF-stage and antenna will be complete GPS receiver.

열확산법으로 만든 CdTe p-n 다이오드의 특성에 관한 연구

채건식,김영국,설정식,전동성 慶南大學校 附設 基礎科學硏究所 1990 硏究論文集 Vol.2 No.-

Single crystals of CdTe were grown by Bridgman method from a melt. They were contained the element of 0.1, 0.15, 0.2mole % In and 0.1mole % P as a dopant respectively. The crystallographic direction of the grown CdTe have zinc blende structure which is(331) plane 2θ=62.6。 in X-ray method. The etch pits on the (100), (110) and (111) surfaces grown to characteristics shapes with E-Ag or PBr was found to consider with the crystallographic direction denoted by simple Miller indices as is depicted schematically. Here the pits on (100), (110) and (111) show rectangular, triangular and conical shapes respectively. The results of PL measurements of undoped and In-doped CdTe showed the maximum peak at 7475 Å and 7503 Å, and P-doped CdTe by thermal diffusion showed the maximum peak at 6943 Å and 7478 Å , the former was shown by Al and the later by phosphorous. The values of the electrical chracteristics have been compared with the Yamada's and we showed the good agreements between them. The thickness if Al thermal diffusion to the CdTe crystals were propotional to the diffusion time. The properties of these cells have good rectification with forward and reverse voltage.

친수성으로 표면개질한 폴리설폰막의 투과플럭스

송근호,김강희,조성헌,이광래,임종호,배성수 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1

실관막형 폴리설폰 막의 표면을 2-hydroxyethylmethacrylate(HEMA)로 코팅하였으며, 코팅인자들인 azobisisobutyronitrile(AIBN)/HEMA 성분비, 용매의 종류(물, 메탄올), UV 조사시간 등이 투과플럭스에 미치는 영향을 조사하였다. AIBN/HEMA/ 메탄온ㄹ 용액으로 코팅한 막이 AIBN/HEMA 성분비가 높고, UV 조사시간이 길수록 투과플럭스가 높았다. AIBN/HEMA 성분비가 낮으면 동일한 투과플럭스를 얻기 위하여 UV조사시간을 더 길게 하여야 하며, 특정한 AIBN/HEMA 성분비와 UV 조사시간에서 코팅한 막의 투과플럭스는 원래의 막(코팅하지 않은 막)보다 높게 나타났다. 또한, 오일에멀젼에 의한 fouling은 코팅한 막과 원래의 막에 모두 나타났지만, 코팅한 막의 fouling이 원래의 막 보다 현저히 낮았다. 즉, fouling 발생 후 코팅한 막의 수투과 플럭스(0.2683g/㎠ㆍmin)는 코팅하지 않은 막(0..448g/㎠ㆍmin)보다 약 6배 이상으로 높게 유지되었다. A hollow-fiber type polysulfone UF membrane was surface-coated with 2-hydroxyethylmethacrylate(HEMA). The effect of various coating paramters on permeation flux was investigated, such as concentration ratio of Azobisisobutyronitrile(AIBN)/HEMA, solvent (water or methanol), and UV irradiation time. The membrane coated with a solution of AIBN/HEMA/methanol showed about 2.65 times higher water flux than that coated with a solution of AIBN/HEMA/water. The membrane coated with a solution of higher AIBN/HEMA ratio and a longer UV irradiation time exhibited a higher permeation flux. The membrane coated with a solution of lower AIBN/HEMA ratio needed a longer UV irradiation time for coating to get a same level of permeation flux. In order to have a greater permeation flux than uncoated membrane, the membrane should be coated with a solution of a certain AIBN/HEMA ratio and UV irradiation time. The fouling by oil emulsion occurred to both of the coated and the uncoated membrane. However, the fouling of coated membrane was much less than uncoated one; the water flux(0.2683g/㎠·min)through the coated membrane was about 6 times higher than that(0.0558g/㎠·min) through the uncoated membrane.

BER을 경감하기 위한 직접파와 지연파를 분리, 합성하는 시스템

洪性一,邊健植,鄭宗宇,朴在云 東亞大學校 附設 情報通信硏究所 1993 情報通信硏究所論文誌 Vol.1 No.1

본 논문에서는 다중 경로에 따른 수신신호의 노화, 특히 이동통신에 대해서 문제가 되는 페이딩 대책으로 직접파와 지연파를 분리, 합성하는 적응 배열 안테나 시스템을 제시하고 분리된 직접파 출력 또는 지연파 출력만을 이용하는 시스템보다 두 신호를 합성한 시스템의 BER이 개선됨을 제시하였다. 시뮬레이션을 행한 결과 적응 배열 안테나가 적절히 동작하는 상황에 대해서는 분리된 출력을 적응적 Weight 조정을 하여 합성함으로써 직접파만을 이용하는 것보다 오율이 향상됨이 확인되었다.

약물 유발성 파킨슨 증후군의 임상적 특징

고성범,조용현,김병조,박민규,박건우,이대희 대한노인병학회 2001 Annals of geriatric medicine and research Vol.5 No.1

젓갈의 유래 및 영양학적 고찰 : Fermented Fish Products

이성희,이현자,강근옥 안성산업대학교 1993 論文集 Vol.25 No.-

The purpose of this study was investigated historical background, kind, character and nutritional value of Jeot-Kal(fermented fish product). The result were as folows:(1) Edible history of Jeot-Kal was dated from acient times. (2) 30 kinds of Jeot-Kal found according to types and part of fish used. (3) Jeot-Kal is considered as a excellent food which is rich in protein, vitamin, inorganic substance, nucleic acid etc. caused by resolution of raw material substances in nutrition.

안성읍의 식생활관리 실태에 관한 연구

이성희,이현자,강근옥 안성산업대학교 1996 論文集 Vol.28 No.-

How scientifically and reasonably the meal management is done has a great influence upon domestic economy, I think. The purpose of this paper is to examine the problems of meal management. In order to investigate t도 actual conditions of food intake, I chose ramdomly 418 families living in Ansung-Eup, Kyunggi Province and had direct interviews with housewives. The main results of this study are as follows: (1) 92.6% of 418 families was furnished with New-fashioned kitchens, and 1.2% of them were without waterworks and drainage. (2) The ratio of the housewives who made a food budget was 71.1%, while the ratio of those who did not was as high as 28.9% the reason for that was they were not accustomed to doing it. (3) The time required for cooking was on an average 40.8 minutes and 70.4minutes a day. (4) In the process of cooking, favorite foods were considered first and next, taste and nutrition. (5) The cooking frequency was hige in such groups as the old-aged, large-familied and that of housewives with jobs. (6) The ration of husband's assistance for kitchen work was as low as 2.1% to 45.2%, while the ratio without husband's assistance was as hige as 39.1% (7) The examination showed that 25.4% of housewives would like to have more convenient appliances to simplify cooking.

표면개질된 폴리설폰 막에 대한 오일에멀젼의 수투과 플럭스

송근호,김강희,조성헌,이광래 강원대학교 산업기술연구소 2003 産業技術硏究 Vol.23 No.A

A hollow-fiber type polysulfone UF membrane was surface-coated with hydroxyethylmethacrylate (HEMA). The effect of various coating parameters on permeation flux, such as concentration ratio of AIBN/HEMA, solvent(water or methanol). and UV irradiation time, was investigated The water permeation flux of oil-emulsion increased with concentration ratio of AIBN/HEMA. and increased with UV irradiation time The flux of the membrane coated in solution using methanol as a solvent was greater than that of the membrane coated in solution using water as a solvent The flux of both the coated and the uncoated membrane declined with the operation The flux decline means that the membrane fouling by oil-emulsion occurs However, the fouling of the coated membrane was much less than that of the uncoated membrane

Rahnella aquatilis를 이용한 Lactan gum 생산에서 탄수화물 대사

나건,이성호,이기영 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.4

Rahnella aquatilis에 의해 생산되는 lactan gum은 고점성 물질로 의가소성 유동거동을 보인다. pH가 7.0으로 제어된 발효조 배양에서 lactose나 sucrose같은 2당을 기질로 삼았을 때의 lactan 생산량은 glucose나 galactose같은 단당의 경우보다 2배 이상의 큰 값을 보였다. 초기탄소원 농도가 45 g/l인 lactose와 sucrose의 lactan gum 생산량은 27, 28g/l로 60% 이상의 수율을 보였다. Lactose를 glucose와 galactose로 가수분해시키는 β-galactosidase의 활성은 lactose와 galactose를 기질로 사용하였을 때 유도되었고 lactose를 기질로 사용한 경우 최고 4000U/ml까지의 큰 값을 보였다. 그러나 초기 탄소원이 혼합 탄소원 I (glucose+galactose)인 경우 단당(glucose, galactose)의 경우에 비해 lactan gum 수율이 높았고 45 g/l의 lactose와 비슷하였다. β-galactosidase의 반응이 필요하지 않은 혼합탄소원 I의 경우에서 lactose로의 lactan gum 생산능과 비슷한 값을 보인 것으로 보아 β-galactosidase에 의한 lactose 분해반응은 율속 단계가 아닌 것으로 판단된다. 초기 탄소원을 혼합 탄소원 Ⅱ(glucose+ fructose)으로 하였을 때 총 탄소원의 소비속도는 sucrose보다 늦었으며 glucose의 소비가 fructose의 소비보다 빨랐다. Lactan gum produced by Rahnella aquatilis is a high viscous, anionic polysaccharide and has shear thinning behaviour. Lactan gum yield and concentration was greater on disaccharides such as lactose and sucrose than on monosaccharides such as glucose and galactose. When initial carbon source concentration was 45 g/l sucrose or lactose, the microorganisms produced 26 g/l and 27 g/l of lactan, respectively with a yield more than 60%. β-Galactosidase, hydrolying lactose into galactose and glucose, was induced by lactose or galactose. When initial carbon source was 45 g/l of mixed carbon I (glucose:galactose=1:1), lactan gum concentration was higher than that from 45 g/l of monosaccharide (glucose or galactose) but was similar to the result from 45 g/l of lactose. Therefore, lactose hydrolysis reaction by β-galactosidase does not seem to be rate determining step in lactan gum biosynthesis. When initial carbon source was 45 g/l of mixed carbon Ⅱ (glucose:fructose=1:1), total carbon source consumption rate was slower than that from sucrose, but glucose consumption rate was faster than that from fructose.

마라톤 웹사이트의 서비스품질이 고객만족 및 구매후 행동에 미치는 영향

고성온,유근직 江原大學校附設體育科學硏究所 2004 江原大學校附設體育科學硏究所論文集 Vol.- No.27

The purpose of this study was to examing the influence of service quality in marathon web site on customer satisfaction and post-purchase behavior. The subjects of this study were 331 people who had visited a marathon web site. The web site's service quality is consisted of four dimensions as follows; Information, Convenience, flow experience, Communication factors. To analyze the collected data for this study, SPSS 10.0 program and AMOS 4.0 were used for descriptive statistics, factor analysis and structural equation modeling(SEM). The results of this study were as follows. The first, three factors n service quality(Information, Convenience, flow experience) affected the customer satisfaction with statistic significance. Especially, level of providing Information affected customer satisfaction directly. The second, customer satisfaction affected word of mouth(WOM) and reentering in web site related to marathjon with statistic significance. In conclusion, web site for marathon in future needs to improve the information service, helpful and interesting contents, and convenient procedures for facilitating people's interest in marathjon.