전도성 충전물을 이용한 도전성 판재의 제조기술 개발

남효덕,이현석,박봉국 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.1

As an effort of developing efficient materials for shielding EM waves, a fibrous sheet for shielding EMI is developed by adding conductive filler to fibrous sheet during hardening process. From the aspect that the conductivity is inversely proportional to the square value of the length of added material, the conductive filler is fabricated by electroless plating with nickel and copper to the polymer textile power which has very high anisotropy. The conducting sheet was also fabricated by applying proper amount of highly efficient conductive filler to the fibrous sheet. The results obtained by measuring the shielding characteristics of 1㎒∼1㎓ frequency range showed the EMI suppressing effectiveness of 10∼20 ㏈.

항공우주용 복합재튜브의 충격압궤특성에 관한 연구

김영남,최효석,기경서,김기형,양인영 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1

본 연구의 목적은 준정적 및 충격실험에 대한 CFRP 박육부재의 에너지흡수특성에 관하여 고찰하고자 한다. 준정적실험은 신강좌굴실험기를, 충격실험은 수직식 충격압궤실험장치를 사용하였으며, 총 178개의 CFRP 박육부재에 대하여 준정적 및 충격압궤실험을 수행하였다. CFRP 원형관의 압궤실험시 그 응답특성은 매우 복잡하며, 압궤과정중 상이한 역학적 상호관계에 의존하게 된다. 본 연구에서는 다양한 적층조건을 갖는 박육부재의 압궤특성과 흡수에너지에 관하여 실험후 고찰하였다. 그 결과 CFRP 박육부재의 에너지 흡수 특성은 초기결함(Trigger)과 계면수 등에 관한 다양한 함수로 나타났으며, 일반적으로 CT-타입의 CFRP 박육부재의 에너지 흡수특성이 다른 박육부재에 비해 가장 높음을 알수 있었다. The purpose of this study is to investigate on the energy absorption characteristics of CFRP (Carbon Fiber Reinforced Plastics) tubes on quasi-static and impact tests. Quasi-static and impact compression tests were performed on 178 tubes. Static compression tests have been carried out using the static testing machine(Shin-gang buckling testing machine) and impact compression tests have been carried out using the vertical crushing testing machine. When such tubes are subjected to crushing loads, the response is complex and depends on the interaction between the different mechanisms that control the crushing process. The collapse characteristics and energy absorption of a variety of tubes have been examined. The results varied significantly as a function of trigger and interlaminar number. In general, the CT-type tubes absorbed more energy than the others.

체육 서비스조직의 리더십유형과 직무만족 및 조직유효성 간의 관계

천길영,남궁완,최병학,박효찬,홍승달,정석현 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The purpose of the study was to examine the relationship among style of leadership, job satisfaction, and efficacy of sport service organization. In order to achive this purpose three reaserch questions were established. Participants for this study were 300 of 23-50 overaged public workers. Of participations valid data were 279. They completed a modified inventory of the style of leadership, job satisfaction and efficacy of sport service organization. More details, style of leadership Scale modified by Ahn(2000), job satisfaction by Ahn (2000) and efficacy of sport service organization by Kim(2001) were using after remodifing scale to investigate the purpose of this study. Results were analysed in quantitative approaches. Data were collected through self-administered survey. The most three meaningful results of the study were as follows; First, there was influenced to relationship between style of leadership and job satisfaction. Second, there was influenced to relationship between style of leadership and efficacy of sport service organization. Third, there was influenced to relationship among style of leadership, job satisfaction, and efficacy of sport service organization.

친사회적 협동게임이 유아의 자아개념 발달에 미치는 영향

안을섭,왕석우,남효순 한국유아체육학회 2002 한국유아체육학회지 Vol.3 No.-

본 연구의 목적은 친사회적 협동게임 활동이 유아의 자아개념 발달에 미치는 영향을 규명하는 데 있었다. 이러한 목적을 달성하기 위하여 본 연구는 만 4세 유아 60명을 대상으로 선정하였으며, 임춘금(1995)이 번역, 수정한 유아용 자아개념 그림검사도구를 검사도구로 사용하여 5주간 16회에 걸쳐 유아들이 친사회적 협동게임 활동을 경험하게 하였다. 그리고 수집된 자료는 통계프로그램인 window용 spss 10.0을 사용하여 분석하였다. 그 결론은 다음과 같다. 첫째, 친사회적 협동게임 활동에 참여한 경험은 유아의 자아개념에 긍정적인 영향을 미치는 것으로 나타났다. 즉, 친사회적 협동게임 활동을 통하여 자아개념의 네 가지 하위 요인인 인지적 자아개념, 정서적 자아개념, 사회적 자아개념, 신체적 자아개념의 점수가 모두 통계적으로 유의한 차이가 있었다. 둘째, 친사회적 협동게임에 참여한 경험아 자아개념에 미치는 영향은 남아와 여아 모두에게 통계적으로 유의한 수준에서 영향을 미친 것으로 나타났다. 이러한 결론을 통하여 볼 때, 유아교육기관이 친사회적 협동에 기초한 게임활동 프로그램을 규칙적으로 전개한다면 유아의 긍정적 자아개념을 증진시키는데 도움이 된다고 사료된다. Subjects of this study is 60 4-years-old children (34 boys and 26 girls) in S kindergarten located in Bundang area. Testing instrument developed by Bently and Yeatts (1974), and revised by Yim, Choon-Keum(1995) was used to test children's self-concept. Data were statistically analyzed by spss 10.0. Conclusions drawn from the results of this study are as follows: First, It caused affirmative effect for the self-concept of young children who has an experience what the intimate prosocial cooperative. There are four factors of the self-concept : recognizable self-conception, the emotional self-conception, the society self-conception, the body self-conception. Second, the gender distinction of a young children who has been experienced prosocial cooperative games affect to young children's self-conception by statistics. Finally, the result of this study are as follows : if many young children institutes use this game programs are based on prosocial cooperative, we may get the huge effectives that development of self-concept.

한국인 성인 남성 폐쇄성수면무호흡 환자의 측모 두부 방사선계측학적 비교

황상희,박인숙,남기영,김종배,조용원,서영성,안병훈,박신구,박효상 대한치과교정학회 2008 대한치과교정학회지 Vol.38 No.3

본 연구는 비만도에 따른 한국인 남성 폐쇄성수면무호흡 환자의 측모 두부 방사선계측학적 특성을 파악하기 위하여 시행되었다. 이를 위하여 계명대학교 의과대학 동산의료원 수면클리닉에 수면장애를 주소로 내원하여 수면다원검사 후 치과에서 측모 두부방사선계측사진 촬영을 한 87명의 성인 환자들을 체질량지수(BMI)와 수면무호흡지수(AHI)에 따라 비비만 단순코골이군(Non-obese, simple snorers), 비만 단순코골이군(Obese, simple snorers), 비비만 수면 무호흡군(Non-obese, OSA patients), 비만 수면무호흡군(Obese, OSA patients)의 4군으로 나누어 비교하였다. 그결과, 4군 중 비만 수면무호흡군의 수면무호흡지수가 가장 컸으며, 비만 수면무호흡군보다 비비만 수면무호흡군의 하악각이 더 크고 혀 길이는 더 작았다. 또한, 비비만 수면무호흡군보다 비만수면무호흡군의 설골이 더 전하방에 위치하였고, 수면무호흡지수에 영향을 미치는 기여 인자는 비만 수면무호흡군에서는 혀 길이, 비비만 수면무호흡군에서는 설골의 후방위치였다. 이처럼 비만 수면무호흡 환자와 비비만 수면무호흡 환자의 측모 두부방사선계측학적 특성과 기여 인자가 다르게 나타나므로, 치료방법도 따라서 다르게 선택해야 할 것이다. 비만 수면무호흡 환자들에게는 먼저 체중감량이 권고되어야 할 것이고, 비비만 수면무호흡 환자들은 폐쇄부위에 따라 구강 내 장치나 Nasal CPAP (continuous positive airway pressure), UPPP (uvulopalatopharyngoplasty) 등이 추천될 수 있을 것이다. Objective: The purpose of this study was to compare the cephalometric measurements of obese and non-obese Korean male patients with obstructive sleep apnea syndrome (OSA). Methods: Eighty-seven adults who had visited the Sleep Disorder Clinic Center in Keimyung University, Daegu, Korea were examined and evaluated with polysomnography (PSG) and lateral cephalogram. They were divided into 4 groups (non-obese simple snorers, obese simple snorers, non-obese OSA patients, obese OSA patients) according to AHI (Apnea-Hypopnea Index) and BMI (Body Mass Index). Results: The obese OSA group had the highest AHI among the 4 groups. The non-obese OSA group had a significantly steeper mandibular angle and shorter tongue length than the obese OSA group. The hyoid bone of the obese OSA group was positioned anterior and inferior as compared with the non-obese OSA group. Multiple regression analysis showed that tongue length in the obese OSA group and retroposition of hyoid bone in the non-obese OSA group were significant determinants for the severity of AHI. Conclusions: From a cephalometric point of view, the obese and non-obese pateints with OSA may be characterized by different pathogeneses. Therefore, they have to be managed by individualized treatment. For the obese OSA patients, weight control must be advised as a first choice and for the non-obese OSA patients, oral appliance, nasal CPAP, UPPP and others could be chosen according to the obstructive sites.

일반인의 환경문제 의식과 사회환경교육의 필요성에 관한 연구

허명,최돈형,박소현,성효현,박석순,남상준,이숙임 이화여자대학교 환경문제연구소 1998 이화환경연구 Vol.2 No.-

Today, the gobal community is confront serious environmental crisis derived from related problems energy and resources. To deal this crisis, people must take action in order to preserve current environment with ecological understanding of the relationship between human and environment. The principle of this thesis is to observe public endeavor toward environmental education program, environmental perception and environmental preservation behavior, and the influential factors to those conducts. First of all, we will look into the perception toward environmental deterioration, environmental perception, environmental preservation behavior which thought to be a ground solution to lesson the problems, and then the environmental education program. In accordance with those research, it will be presented the feasible directions of environmental education program for general public. This research consists of 10 topics. The topics are the interests of public about environmental problem, perceived pollution level, general knowledge about environment, perception related to environmental problem, opinions about the environmental education program, attitude towards environmental organization, suggestions for future environmental education program, and campaign for environmental preservation. Through the research, we have reached some analytical conclusions are followed: First, the level of public concerns about environmental problems is high regardless its age and sex, and the level has been growing compared to the past one. The result also shows that people in urban and industrial areas feel much more seriously pollution problems than those in rural and coastal areas. In addition, according to the survey result, household and industrial sewage are regarded as the primary causes for water pollution. Secondly, the results show general public's understanding on environment have been universalized and thus the level of common knowledge on global environment has been increased, as environmental problems have been raised by newspapers and mass medias and various movements have been accomplished by environmental protection organizations. Thirdly, although the necessity of environmental education was emphasized the purpose of environmental education was unclearly appeared. Furthermore, actual participation to the environmental education program and taking courses by joining environmental organizations were rarely shown. Although some cases have the experience of taking education courses, the negative reactions came out in the opinion of education content and methodologies. Fourthly, the analysis on curriculum of future environmental education show various opinions. The attentions have drawn on the dealings of waste industrial and chemical waste which will cause environmental problem artificially, as well as on global environment, or natural environment such as resources, land, water, atmosphere. The results show many people recognized administration extent such as environmental policy, law and ethics as environmental categories. This implies the curriculum of those areas have not been properly founded and further researches should be followed. From above results, environmental problems should not be regarded as simple problems and it should bring out new recognition for general public in everyday life. In addition, environmental education courses, with practical environmental preservation should be developed and programs and organization which will utilize those educational materials should be more activated.

Elevation of the Gut Microbiota Metabolite Trimethylamine N-Oxide Predicts Stroke Outcome

Hyo Suk Nam,Jimin Ha,Dajeong Ji,Il Kwon,Hye Sun Lee,Minho Han,Young Dae Kim,Ji Hoe Heo,Sang-Guk Lee 대한뇌졸중학회 2019 Journal of stroke Vol.21 No.3

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Improved Time Intervals by Implementation of Computerized Physician Order Entry-Based Stroke Team Approach

Nam, Hyo Suk,Han, Sang Won,Ahn, Seong Hwan,Lee, Jong Yun,Choi, Hye-Yeon,Park, In Cheol,Heo, Ji Hoe S. Karger AG 2007 Cerebrovascular diseases Vol.23 No.4

<P><I>Background:</I> The need for rapid evaluation and treatment of acute stroke patients has been well documented. A computerized physician order entry (CPOE) system can improve communication and provide immediate access to information, which may be useful for an effective team approach program targeted to reduce in-hospital time delays. <I>Methods:</I> To reduce the time from a patient’s arrival at the emergency department to thrombolysis, a team approach program using CPOE was developed, and its efficacy was investigated by comparing time intervals from arrival to evaluation and intravenous tissue-type plasminogen activator (tPA) treatment before and after the implementation of the program. <I>Results:</I> Among 379 consecutive patients who were screened as potential candidates for thrombolysis, 25 patients (6.6%) received tPA during a 1-year period after initiation of the program. Fourteen patients were treated with tPA in the previous year. After program implementation, time from arrival to computed tomography scan was reduced from 34 to 19 min (p = 0.01). Time to report of complete blood count was also shortened from 52 to 33 min (p < 0.01). Finally, time from arrival to tPA treatment was reduced by 23 min (from 79 to 56 min; p < 0.01). Onset-to-door time tended to be longer after the program implementation (from 41 to 60 min; p = 0.14). <I>Conclusions:</I> Implementation of the CPOE-based team approach program significantly reduced time from emergency department arrival to evaluations and treatment.</P><P>Copyright © 2007 S. Karger AG, Basel</P>

Long-Term Mortality in Patients With Stroke of Undetermined Etiology

Nam, Hyo Suk,Kim, Hyeon Chang,Kim, Young Dae,Lee, Hye Sun,Kim, Jinkwon,Lee, Dong Hyun,Heo, Ji Hoe Ovid Technologies Wolters Kluwer -American Heart A 2012 Stroke Vol.43 No.11

<P>The determination of stroke etiology is essential for planning treatment for stroke prevention. However, the etiology of stroke is undetermined in many patients.</P>

Gut Microbiota and Ischemic Stroke: The Role of Trimethylamine N-Oxide

Hyo Suk Nam 대한뇌졸중학회 2019 Journal of stroke Vol.21 No.2

Trimethylamine N-oxide (TMAO) is produced when trimethylamine, a waste product of gut microbes, is converted via hepatic flavin monooxygenases. As TMAO is a potential causative factor in various cardiovascular diseases (CVDs) considerable research interest has arisen on its use as a biomarker. Higher TMAO levels are associated with future risk of both incident CVD in the general population and established CVD, including stroke. The addition of TMAO into models with traditional risk factors significantly improved the prediction of future CVD risk. TMAO promotes atherosclerosis and is associated with platelet hyperreactivity and inflammation, which are in turn associated with the development of stroke and its secondary consequences. Additionally, TMAO may play a key mediator role in the relationship between the diet, gut microbiota, and CVD development. Compelling evidence suggesting that TMAO is both a risk factor and prognostic marker of stroke and CVD. Potential therapeutic strategy of diet and drugs in reducing TMAO levels have emerged. Thus, TMAO is a novel biomarker and target in stroke and CVD prevention.