개인휴대통신의 기술발전

강민구,조형래,강성철 호남대학교 정보통신연구소 1994 정보통신연구 Vol.3 No.-

이동통신 서비스의 증가와 무선통신 기술의 발전으로 개인휴대통신 서비스의 도입이 각국에서 활발히 추진되고 있다. 본 논문은 국내 개인휴대통신 서비스의 보급과 확대를 위해 고려해야 할 여러 시장 동향과 표준화 동향에 대해 조사하고, 개인휴대통신 구축을 위한 기반기술인 지능형 교환기와 부호다중화 접속기술 및 개인휴대통신 서비스의 직면한 과제의 해결책에 논한다. In this thesis, the technical trend of personal communication service (PCS) is showned for the implementation of PCS in Korea. The comparision betweem technical schemes of many countries is represented for the Korean standards and the core technique of PCS. EspEcially, the code division multiple access (CDMA) and the intelegent switching systems are explained for the Korean PCS standards.

남한의 동·하계 인체보온지수 분포의 특성

강철성 한국 지리·환경 교육학회 1998 한국지리환경교육학회지 Vol.6 No.1

Clothing has been designed to a much greater extent by fashion and by technological developments in industry than by any scientific analysis of the heat exchange allowed by clothing between the wearer and his environment. However, requirements to maximize survival time, extend performance time and improve the general comfort of human exposed to extremes of Arctic, desert or tropic environments have required the development of a multi-disciplinary, multi-level program at the laboratory in America, Europe. These scientific analyses, essential to deal with environmental extremes and to evaluate the relative contributions of various factors to thermal aspects of clothing comfort. The purpose of this study is to show do-distribution pattern in South Korea based on insulation unit by the heat flow equations. The do-distribution pattern to average temperature and average wind speed are analyzed to produce the heat flow equations from which average human reactions to the climatic factors can be deduced Clo-values for each Weather Forecast Offices(1961 -1990) and Weather Observation Stations (1973-1990) are calculated based on 10-days normals data, do-values for the 67 stations are constructed to show how man tend to wear clothing in various areas. The results of study are as follows; In winter, the do-values show two characteristic pattern on the insulation, Thegwallong regions has the highest do-values while Sogwipo has the lowest in South Korea, and coastal areas are higher than in the interior areas, Coastal areas of the East Sea are lower than coastal areas of the Yellow Sea at the same latitude. This regional distribution is a result of predominant temperature, wind speed and orographic effects of high mountainous regions. Especially, the lowest do-values is calculated in South Korea show in the middle of January. The characteristics of this phenomena are associated with strength of Siberian High. In the early summer rainy season(Changma), the do-values is very high in the Taegwallong regions and the Southern interior regions due to the influence of the orographic effects or the altitude. Particularly coastal areas are generally higher than interior areas because of the sea-land breezing. In the hot summer, the do-values of the Taegwallong and the Southwestern regions are higher than any other regions in South Korea. Another characteristic trait that stands out on the map is the fact that the coastal areas are always higher than the adjacent coastal areas except central areas. All regions except the Taegwallong regions and Central interior regions have been the low values during the period from the early of August to the middle of August. These are largely derived from the stable weather with the highest temperature, humidity and strong radiation by the North Pacific Anticyclone appears in Eastern Asia. Finally, the heat flow equations presented are valuable tools in clothing design and such evaluations are desirable in studies of the man-clothing-job-environment system for ordinary clothing, as well as for advanced clothing systems with artificial environmental conditioning. For the detailed evaluations of the thermal protection, the experimental study should be carried out in the laboratory and climatic chambers.

都市住民의 環境質 分析

姜成哲 釜山大學校行政大學院地方行政硏究所 1989 地方과行政硏究 Vol.1 No.2

Flora of Mt. Woosanbong, Korea

Kang,Shin-Ho,Lee,Young-Sim,Ko,Sung-Chul 한국자원식물학회 2003 Plant Resources Vol.6 No.1

This study was performed to investigate the flora and plant resources of Mt. Woosanbong (537.8 m) from April to October 2002. The collected vascular plants were composed of all 389 taxa including cultivated species, and classified into 329 species, 2 subspecies, 53 varieties, and 5 forms of 248 genera under 81 families. Six taxa of the Korean endemic plants and 4 taxa of the rare and endangered plants were also distributed in this mount. Resource plants were categorized into edible 181, pasturing 160, medicinal 136, stainable 94, ornamental 77, timber 22, fiber 5 and industrial 4 taxa, respectively. Floristic geography of the investigated area was regarded as the boundary between middle and southern parts in floristic pattern of the Korean Peninsula.

Landscape Ecological Study on the Habitats of Three Thalictrum Plants and its Distribution

Kang,Shin-Ho,Ko,Sung-Chul 한국자원식물학회 2004 Plant Resources Vol.7 No.1

The purposes of this study were to clarify of floristic composition and the landscape structure on the habitats of three Thalictrum plants, which were distributed in Daejeon, Korea. Floristic composition of habitats was organized by living in flatten open space needed a lot of sunlight and humidity. Landscape ecological structure of habitats was defined by soils of loamy skeletal mesic, slope between 25 to 30˚ Vegetation rating was 75 percent of woody coverage at less than 450 m above the sea levels, respectively. Distribution patterns of Thalictrum plants in Daejeon were presented on the 1 km X 1 km grid map.

생쥐 2-세포기 수정란의 초급속동결

강만종,이철상,한용만,유대열,이경광 제주대학교 농과대학 제주도축산문제연구소 1991 畜産論叢 Vol.6 No.1

This study was carried out in order to investigate eggects of cryoprotectant concentration and equilibration time on survival of ultrarapidly frozen 2-cell mouse embryos Mouse 2-cell embryos. fol-lowing dehydration by exposure to DMSO and sucrose. were directly immersed into liquid nitrogen and thawed in 37℃ water. Viability was defined by development rate to the blastocyst stage after in vitro culture for 72 hours. The results are summarized as follows ; 1. When 0.25M of sucrose was added into the freezing medium a t various concentrations of DMSO and dilution medium, higher development rate of embryo was obtained in 3.0M DMSO conentrations (82.6%). However, When sucrose concentrations of 0.25 and 0.5M were added to the freezing medium with 3.0M DMSO and dilution medium, development rate of embryos were 81.7% and 24.1%, respectively. 2. In the equilibration time at room temperature, higher development rate was attained after short period of time(2.5min) in 3.0M DMSO +0.25M sucrose(85.9%). 3. The development rate of embryos at in vitro 2-celL in vivo 2-celL solution control and untreated control was 84.6%, 90.9%, 89.9%. and 89.7%. respectively.

Biosurfactant 생산 효모 Rhodotorula sp. G-1의 분리 및 Biosurfactant 생산

강상모,이철수,김영찬 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.2

미생물 기원의 계면활성제(microbial-surfactant, biosurfactant)를 생산하는 균주를 찾기위해 여러 지역의 토양에서 생산균주를 분리, 동정하였고 이 균주의 발효생산 최적 조건을 검토하였다. 서울과 근교의 주유소 주변 토양에서 20여 균주를 분리하였으며 이들 중 배양액의 표면장력을 가장 많이 저하시켜 다른 균주에 비하여 상대적으로 활성이 좋은 G-1 균주를 분리하였다. 이 균주의 형태학적 및 배양학적인 특성에 의해 동정한 결과 아직까지 biosurfactant 생산균이라고 알려진 바가 없는 새로운 효모인 Rhodotorula sp. G-1로 동정되었다. 이 균주의 최적 biosurfactant 생산 조건은 탄소원인 soybean oil 4%, glucose 2%, yeast extract 0.5%, 인산염농도 0.1%, pH 6.0, 30℃에서 3일간 진탕배양했을 때 surface tension 활성이 가장 높았다. 그리고 처음에는 탄소원으로 soybean oil만을 첨가하여 배양하다가 glucose를 90시간만에 공급한 경우 처음부터 soybean oil과 glucose를 동시 첨가한 것에 비하여 surface tension 활성이 14% 증가함을 알 수 있었다. 이렇게 하여 biosurfactant 양은 15.0 g/l 농도로 얻을 수 있었다. Some microorganisms including yeasts produce surface tension-decreasing biosurfactants. The strain G-1, the best producer of biosurfactant, was isolated from the soil and identified as Rhodotorula sp., which was not discribed any report. The Rhodotorula sp. G-1 produced biosurfactant from vegetable oils, but failed to produce it from n-alkane or carbohydrate. Yeast extract was found to be more effective for the biosurfactant production as nitrogen source than any other inorganic nitrogen source. The composion of the optimal medium contained the following conponents: soybean oil 4%, glucose 2%, yeast extract 0.5%, KH_2PO_4 0.1%, K_2HPO_4 0.1%, MgSO_4 5%, CaCl_2 0.01% NaCl 0.01%, pH 6.o. The surface tension activity was increased to 14% when, at first, the culture broth was fermented with only soybean oil as carbon sourse, and after 90 hours, feeded glucose, than that of glucose and soybean oil added to it simultaneously. The maxium yield of the biosurfactant was about 15 g/l by, after 90 hours, the feeding method of glucose.

방광에 발생한 염증성 근섬유아세포종

강윤일,문형윤,노준,김철성 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.1

Inflammatory myofibroblastic tumor of urinary bladder is a rare benign entity that clinically and radiologically simulates a malignant tumor. This benign lesion must be differentiated histoloeically from several malignant lesion of the bladder. Complete surgical excision, either by transurethral resection or partial cystectomy, appears to be curative. We report a case of inflammatory myofibroblastic tumor of the urinary bladder in a 25-year-old female.

관상동맥질환 환자에서 스텐트 시술 후 재협착에 관한 연구

강진환,권영주,박상호,한대희,이상철,김명구,변정득,최병조,심규혁,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background and aims : In the coronary artery disease, a rate of restenosis was much decreased by placement of coronary stent than when percutaneous transluminal coronary angioplasty has been applied, but there are still important clinical problems of restenosis. There has been many progressive studies about various factors contributed to this restenosis. So, we studied a relation between restenosis after placement of coronary stent in the coronary artery disease and many clinical factors, characteristics of stenotic lesion and procedural factors, and also assessed the restenosis rate of various coronary stents. Methods : Total 58 lesions(46 cases of patients ; man 30, woman 16) were evaluated, which has been performed a follow-up coronary angiography after 6 months (mean 188 days) since coronary stent had been placed. Various stents were implanted and assessed a relation between restenosis and many factors. Results : Of 58 lesions were target stenotic studies, there were 22 of restenotic lesions(37.9%), and the restenosis rate wes statistically significant difference in the relation with diabetes mellitus(p<0.05), group of acute myocardial infarction(p<0.05) among clinical diagnosis of ischemic heart disease(stable angina, unstable angina and acute myocardial infarction) in clinical factors and with high dilation pressure of stent(p<0.05) in procedural factors. When the rate of restenosis was evaluated among implanted stents, it was lowest in the Multilink^(®) stent and highest in the Nir Royal^(®) stent(60%). Conclusion : In this study of restenosis and various factors after placement of stents in the coronary artety disease, factors such as diabetes mellitus, group of acute myocardial infarction and a dilation pressure of stent were significant related with restenosis and the restenosis rate of Multilink^(®) stent was lowest and the highest restenosis rate was of Nir Royal^(®) stent.

태권도 내려찍기 기술의 운동역학적 분석

강성철 용인대학교 무도연구소 2000 武道硏究所誌 Vol.11 No.1

This study is to analyze the Biomechanics characteristics of ax - kick technique in Taekwondo, Three dimensional analysis of videotaped back kick movements was conducted to figure out angular momentum, angular velocity, and muscular moment of the movement. 1. The center displacement of body in Y direction revealed the largest value, which was 83cm. The mass-center of the velocity of lower segment showed the fastest the fight during the preparing phase and the segment of leg during the flexion phase the velocity of the foot was 10.4m/s during the impact. 2. ωχ showed the peak value at the mtinimum knee angle. ωz had the positive Peak during the flexion phase and the decreased to zero level. ωy revealed the positive peak before the take off and the negative peak during the flexion phase. 3. Considering the angular momentum of lower leg, the tight. showed the maximum value in X direction during the flexion phase, the shank and the foot revealed the maximum value at the minimum knee angle. Z component of the shank had the positive changes during the take off and flexion anti Y component showed the negative changes. Z component of the foot had the positive peak during the flexion and Y component revealed the positive peak at the minimum knee angle. 4. Mχ of the lower leg had the greatest value and showed the positive peak during the take off and the negative at the minimum knee angle. The vertical component of the ground. reaction forces showed the maximum value Fz, during the preparing phase. As above, the movement direction of ax-kick showed perpendicularity with out horizontality. That with in 2nd dimension-plane movement. The changeable rate of angular momentum is be in proportion to alteration of power that turns up instantly. The life flexing movement of knee-joint showed reducing inertia moment. Conclusively, the systematical lifting movement of ax-kick which using the hip-joint, the knee-joint, the ankle-joint is the primary factor of the impact.