흉부 X선촬영 기술의 변천에 관한 연구

이창엽,조평곤,김지닐,최소영,김창균,최종학,김정민,김유현 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.2

To find elements which enable improving Quality of image of chest radiography, we attempted to make comparison between chest radiography used currently with that of the past, and following conclusion was reached: 1) It could be confirmed that a dependance on chest radiography was declining, because proportion of chest radiography against overall radiography decreased. 2) There was a change of kVp to a high voltage in a chest radiography, and use of high kVp became a generalization 3) Exposure time was reduced and exposure dose was curtailed accordingly. 4) Apparatus was mainly comprised of 3-phase rectifier circuit and inverter type. 5) It could be confirmed that frequency of applying additional filters for high kVp radiography was insufficient. 6) There was almost no difference in the condition of exposure between hospitals using film/screen and hospitals using CR. But when CR is used for radiography, it was increase in exposure dose due to increase in tube current and it will be necessary to have continuous study on exposure dose by an increase use of CR in the future.

Adaptive Maximum Power Point Tracking Algorithm for Photovoltaic Power Systems

AHN, Chang Wook,CHOI, Ju Yeop,LEE, Dong-Ha,AN, Jinung The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.5

<P>This paper presents an adaptive maximum power point tracking (MPPT) algorithm. The aim is to dynamically adjust the step length for updating duty ratio (or operating voltage) so as to make full utilization of the output power of photovoltaic (PV) systems, even under the rapidly changing atmospheric conditions. To this end, the average slope in terms of voltage and power is exploited for reducing the harmful effect of noise and error (incurred in measurement or quantization) on the slope. Also, a statistical decision-making scheme is employed for reliably deciding the time instant at which atmospheric conditions actually change. Empirical study has adduced grounds for its dominance over existing references.</P>

MgO-Al₂O₃-SiO₂계 요업원료(Mullite,Spinel,Cordierite)의 제조 및 소결특성 : Ⅰ. 알콕사이드 졸ㆍ겔법에 의한 물라이트 미분말의 합성 Ⅰ. Preparation of Mullite Fine Powder by an Alkoxide Sol-Gel Process

이홍림,신승엽,김창은 연세대학교 산업기술연구소 1987 논문집 Vol.19 No.2

Mullite fine powder was prepared from alkoxides and its powder characterization was examined. The average particle size of mullite powder which was prepared at 1300℃, for 3 h was 0.1-0.2㎛ and the surface area was 11.2㎡/g by BET measurement.

만성 요통환자의 복부 심부근과 표재근을 중심으로 한 운동 효과 비교

김진산,이창현,조미주,임연욱,정취산,김선엽 대한정형도수치료학회 2005 대한정형도수물리치료학회지 Vol.11 No.1

Objectives: To compare the efficacy of two types specific exercise intervention (deep and superficial abdominal muscle exercises) in the treatment of patients with chronic low back pain (CLBP). Design: A randomized, comparative, repeated-measures. Subjects: Twenty-four patients with CLBP (at least for 3 months), mean age±SD=51.58±16.21 (yrs). Methods: Twenty-four patients with this condition were assigned randomly to two treatment groups. Both first and second group underwent 3 weeks specific exercise treatment program. The first group specific trained for the deep abdominal muscles. The second group specific trained for the superficial abdominal muscles. Results: After intervention, the first group showed a statistically significant reduction in pain intensity and functional disability levels (p<.05). The second group showed no significant change in these parameters after intervention (p>.05). Conclusions: According to results, a "deep abdominal muscle exercises" treatment approach appears more effective than a "superficial abdominal muscle exercises" treatment in patients with CLBP.

탈지작업 근로자의 트리클로로에틸렌 폭로에 관한 조사

박두용,김형아,김창엽,백남원,조정진,김양호,이광묵 가톨릭대학 산업의학 쎈타 산업의학연구소 1989 韓國의 産業醫學 Vol.28 No.4

Trichloroethylene(TCE) is a widely used organic solvent, especially in degreasing process of metal manufacturing, however few data concerning its exposure and poisoning were obt-ainable. This survey was performed for more information of TCE exposure in this country. Urine sanmples were collected from 144 TCE handling workers and 46 non-TCE-exposed workers. TCE concentrations of four workshops in working environment were analyzed. The results were as follows; 1. TCE exposed workers were 48 male and 96 female employees. Average total duration of employment of these workers was 39.0 months, average duration of works per day was 10.7 hours, and average duation of TCE handling was 469.7 minutes. 2. The average concentration of urine total trichloro-compounds was 156.32㎎/ g crea-tinine, and that of trichloroacetic acid was 69.2㎎/g creatinine. Of those workers, 78 workers had the concentrations of urine trichloroacetic acid over 75㎎/g, which is the biological exposure index (BEI) of urine trichloroaxetic acid in Korea. Duration of work per day and duration of TCE- related work were significantly longer in the group of workers whose urine trichloroacetic acid concentration was over the criteria level of BEI. 3. TCE concentrations of three workshops were over the level of ACGIH TLV(threshold limit value), 50ppm in TWA (time -weighted average). In remaining one workshop, duration of TCE related works was only one hour per day. There was statistically significant correl-ation between the concentration of TCE in working environment and the proportion of workers in a workshop whose urinary trichloroacetic acid concentration was over the criteria level of BEI. 4. Responses to self-administered questionnaire were not meaningful for differentiation of psychoneurologica symptoms due to chronic TCE exposure from othres.

Isolation and Identification of a Lactic Acid Bacterial Strain KJ-108 and Its Capability for Deodorizing Malodorous Gases Under Anaerobic Culture Conditions

( Jeong Dong Kim ),( Jung Hoon Yoon ),( Yong Ha Park ),( Dae Weon Lee ),( Kyou Seung Lee ),( Chang Hyun Choi ),( Won Yeop Park ),( Kook Hee Kang ) 한국미생물생명공학회 2003 Journal of microbiology and biotechnology Vol.13 No.2

中西部地域 百濟漢城期 木棺墓 變化 - 烏山 水淸洞遺蹟을 中心으로

이창엽(Lee Chang-Yeop) 한국고대학회 2007 先史와 古代 Vol.27 No.-

서울과 경기남부, 충청지역에서 확인되는 원저단경호와 심발형토기가 조합되어 부장된 토광묘, 주구토광묘는 중서부지역 분묘 연구에 있어서 선구적인 역할을 담당했던 천안 청당동유적의 연대관에 근거하여 원삼국시대 대표적인 분묘로 인식되고 있다. 그런데 청당동유적의 연대는 당시 자료가 부족한 상황에서 부산 노포동유적과 같은 일부 영남지역 분묘와의 교차연대에 따라 설정된 것으로 이후 많은 자료가 축적되어 재고할 여건이 마련되어 가고 있다고 판단된다. 이에 본고에서는 중서부지역 원저단경호 출토 분묘에 대해 나름의 연대와 변화상을 제시하고자 하였다. 이를 위해 오산수청동유적을 중심으로 분묘의 구조와 유물조합상의 특징을 간략히 살펴보고, 소문단경호와 심발형토기의 형식분류를 중심으로 단계를 설정하였다. 이를 기반으로 교차편년을 행하고 그에 따른 중서부지역에 있어서 목관묘의 변화를 살폈다. 그 결과 기존에 원삼국시대에서 삼국시대 전기에 해당된다고 설정되었던 유물부장부를 가지는 토광묘는 목관묘이고, 그 연대는 3세기말 이후로 편년됨을 확인하였다. 백제의 중심으로 생각되는 서울지역에서의 유례가 없어 명확하지는 않으나, 서울을 제외한 경기 남부와 충청 북부 일대에 있어서는 대동소이한 흐름을 가지는 것으로 보아 서울 역시 예외는 아니었으리라 생각된다. 따라서 이 분묘들이 삼국시대 백제한성기 이른시기의 대표적인 분묘로 생각해도 좋을 것이다. 기존에 4세기대로 편년되어 한성기의 분묘로 생각되었던 백제토기가 출토되는 석촌동 분묘군은 백제토기의 편년 검토를 통해 그 연대는 재고되어야 할 것으로 생각된다. The pit tomb and the pit tomb with ditch in which buried together with combination of short necked round bottom jars and the deep bowl shaped potteries which have been discovered in Seoul as well as in the southern Gyeonggi and Chungcheong region are recognized as the prevailing forms of tomb representing the Proto-Three Kingdoms period based on the chronology of Cheonan Cheongdang-dong remains that has taken a trailblazing role in the research on tombs in mid-west region. However, it should be noted that the chronology of Cheongdang-dong remains had been established according to cross-dating in connection with the tombs found in some part of Yeongnam region, like Busan Nopodong remains, under a situation of lacking data and materials. Since then after, many data and resources have been cumulated, so then it is judged that conditions have been improved so much as to be able to reconsider the chronology thereof. In this research paper, researcher tried to present the chronology and the status of changes with regard to the tombs located in the mid-west region from which short necked round bottom jars were excavated. To do this, the distinctive features of structures of the tomb and of the status of relic combinations were briefly reviewed, and then the phases of change were established with a focus on the classification of type of short necked jar without a paddle pattern and the deep bowl shaped pottery. Cross dating was done based on these works, and according to this chronology, changes in wooden coffin tomb were investigated. As the results, it was confirmed that the pit tomb having the part of the interment of belonging with corpse, of which chronology was so regarded as to fall into the period, ranging from the Proto-Three Kingdoms period to the early Three Kingdoms period, was wooden coffin tomb, and that it was then chronologized after the end of third century. Though it is not so clear, for there were no examples found in Seoul region, which is considered the center of Baekje, it is thought that Seoul would have not been excepted, when judging it based on the fact that there are more or less same trend of the tomb in the southern Gyeonggi and a part of the northern Chungcheong, except Seoul. Therefore, it will be ok if these tombs are considered the tombs representing the early Baekje Hanseong Period. And it is thought that chronology of the group of tombs in Seokchon-dong where Baekje potteries have been excavated and which were regarded as the tombs from the Baekje Hanseong Period, for it was already chronologized as in four century should be reconsidered.

아킬레스 건염 환자의 보행 시 고관절, 슬관절 및 족관절 모멘트의 변화에 대한 연구

유재호(Yu, Jae-Ho),이규창(Lee, Gyu-Chang),이동엽(Lee, Dong-Yeop) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.12

본 연구는 아킬레스 건염 환자들과 정상인들을 대상으로 보행 선형지표와 고관절, 슬관절, 그리고 족관절의 모멘트 변화를 조사하여 아킬레스 건염에 의한 보행의 역학적 변화를 구명하고 아킬레스 건염을 예방하기 위한 예측 인자들을 찾고자 실시되었다. 연구의 대상자는 아킬레스 건염 환자 20명과 비슷한 신체조건을 가진 건강한 정상인 20 명이며, 대상자가 맨발 상태에서 힘판의 중앙 부분을 밟고 지나가도록 13 m의 거리를 편안한 속도로 5회 왕복하도록 하였다. 또한 대상자가 보행하는 동안 3차원 동작분석 장비를 이용하여 고관절, 슬관절, 그리고 족관절 모멘트를 산출 하였다. 수집된 자료들을 SPSS 12.0 소프트웨어를 사용하여 분석하였다. 연구의 결과 아킬레스 건염 환자들의 고관절 은 입각기 초기에 신전 모멘트가 감소하였고, 중후반에는 굴곡 모멘트가 감소하였다. 또한 슬관절에서는 입각기 초기 부터 지속적인 굴곡 모멘트의 감소가 나타났으며 후기에는 신전 모멘트의 감소를 보였다. 그리고 족관절은 입각기 중 반에 저측굴곡 모멘트가 감소하였으며 말기에는 배측 굴곡 모멘트가 감소하였다. 정상인과 비교해 아킬레스 건염 환 자들에게서 보행의 역학적인 변화가 두드러지게 나타났으며, 임상에서는 아킬레스 건염 환자의 보행에 대한 변화를 세밀하게 파악하여 치료적 접근을 시도해야 할 것으로 보인다. 그리고 앞으로의 연구에서는 아킬레스 건염 환자에게 서 나타나는 역학적인 변화에 대한 조사가 더 이루어져야 할 것이다. This study was to investigate the change of gait temporal parameter and ankle joint moment between patients with achilles tendinitis and healthy people. Thus, the purpose of this study is to clarify biomechanical change of gait in patients with achilles tendinitis and to find risk factor for prevention of achilles tendinitis. We recruited 20 patients with an achilles tendinitis and 20 healthy people. While subjects shuttled 5 times on 13 m distance with comfortable pace, we examined gait function marker with three-dimensional gait analysis system. All subject outstepped center of forceplate during gait and calculated ankle joint moment using software. Obtained data was analyzed using SPSS 12.0 software. In results, we confirmed that patients with achilles tendinitis showed reduction of extension moment in early initial phase and reduction of flexion moment in mid-stance on hip joint. and reduction of flexion moment in early initial phase and reduction of extension moment in late phase on knee joint. And we identified that patients with achilles tendinitis showed reduction of dorsiflexion moment in early stance phase, maximal plantarflexion moment in mid stance phase, and dorsiflexion moment in late stance phase. Thus, there are biomechanical changes on gait in patients with achilles tendinitis compared to healthy people. And, in clinical settings, they should focus on changes of gait in patients with achilles tendinitis. Further study will be undertaken for the biomechanical changes of patietns with achilles tendinitis.

Immobilization of Large, Aliovalent Cations in the Small‐Pore Zeolite K‐Natrolite by Means of Pressure

Lee, Yongjae,Lee, Yongmoon,Seoung, Donghoon,Im, Jun‐,Hyuk,Hwang, Hee‐,Jung,Kim, Tae‐,Hyun,Liu, Dan,Liu, Zhenxian,Lee, Seung Yeop,Kao, Chi‐,Chang,Vogt, Thomas WILEY‐VCH Verlag 2012 Angewandte Chemie Vol.124 No.20

<P><B>Hochdruck‐Ionenaustausch</B> an dem kleinporigen Zeolith K‐Natrolit ermöglicht die Immobilisierung von nominell nicht austauschbaren aliovalenten Kationen wie dreiwertigem Europium. Eine Probe, an der bei 3.0(1) GPa und 250 °C ein Ionenaustausch vorgenommen wurde, enthält ungefähr 4.7 Eu<SUP>III</SUP>‐Ionen pro Elementarzelle, was einem Austausch von über 90 % der K<SUP>+</SUP>‐Ionen entspricht (siehe Bild).</P>

[PA-0028] Novel allele of fad2-1a from an EMS induced mutant soybean line, PE529 produced elevated oleic acid

Chang Wan Woo(Chang Wan Woo),Hyun Jo(Hyun Jo),Hwa Yeop Kim(Hwa Yeop Kim),Jong Tae Song(Jong Tae Song),Jeong-Dong Lee(Jeong-Dong Lee) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-