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정한종,최환봉 진주산업대학교 1997 論文集 Vol.36 No.-
With a coming new age, physical education, recreation and leisure activities have become more popular to everyone in everyday life. The rapid changes in present society have made people change a lot of things they used to do. Professionals in this field have to prepare to investigate the various factors presently changing and should establish plans toward this field. Of particular interest are the increasing ages health and social welfare, a cyber technology used for elite sports and the public, industrial management in the sports, leisure activities and the concerns of relationship between leisure, sports activities and the environments. In order to predict and take measures for these issues in the coming near future, this study aims to report some factors which may be brought up and understood. First, it is necessary to provide old people with better quality services for health, leisure time, programs for physical activity guided by professionals for a better quality of life. Secondly, in the cyber technology, it must be used more effectively to achieve the best record for elite sports and it's use must be generalized in the public sector for leisure and physical education. Third, management of leisure industry and sport activities have become more significant issues at present. It also needs more professionals to organize and promote an interest of both public and business sectors. Finally, the environmental leisure activity issues in this field are both physical and social. Good care must be taken in building sport facilities in order to protect natural enviornment and have convenient public access. Above all, it is important to train the professional who control and plan programs, such in the coming age.
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김성환,황성오,이강현,조준휘,강구현,문중범,이승환,윤정한,최경훈,김영식 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3
Background: The aim of this study was to determine whether the conventional subcostal approach is suitable for emergency pericardiocentesis in patients with cardiac tamponade or impending cardiac tamponade. Methods: This study was a prospective, observational study conducted at the emergency department of a tertiary hospital, Patients who had symptomatic pericardial effusion and who needed emergency pericardiocentesis in the emergency department were included in this study. We measured the epicardium-to-pericardium distance at the subcostal, parasternal, and apical area with two-dimensional echocardiography to determine the appropriate puncture site for pericardiocentesis. An epicardium-to-pericardium distance of more than 1.0 cm was considered as the primary safety factor in determining the Puncture site for pericardiocentesis. The skin-to-pericardium distance was considered as secondary safety factor. Results: Ninety-five consecutive patients(55 males and 40 females; total mean age: 53 year old) with cardiac tamponade or impending cardiac tamponade were enrolled in this study. The puncture site for pericardiocentesis, as determined by echocardiography, was the subcostal area in 43 patients(45%), the apical area in 40 patients(42%), the left parasternal area In 11 patients(12%), and the right parastemal area in one patient(1%). Pericardiocentesis failed in 2 patients(2%) with the subcostal approach and in one patient(1%) with the apical approach. The average epicardium-to-pericardium distance was 31 ±21 mm in patients with the subcostal approach and 21±8 mm in patients with other approaches. There were no differences in the amount of pericardial fluid and in the intraperical pressure among patient groups according to puncture site. There were two procedure related complications: a puncture of the right ventricle with the subcostal approach and a ventricular tachycardia with the apical approach.
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기계적 합금화에 의해 제조된 고규소 Al-Si 합금 나노 결정의 특성
이정일,김일호,홍태환,어순철,양계준,석현광,한만갑,최국선,김준수 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.7
High silicon Al-Si alloys with nanocrystalline structures have been produced by mechanical alloying process. Microstructural changes of the Al-Si alloys were investigated by scanning electron microscopy and the transmission electron microscopy. X-ray diffraction analysis was also made to characterize the lattice constant, crystallite size and misfit strain. It was found that the effective milling time by attrition milling was about 12hours for Al-70 wt%Si alloy system. The Al and Si crystallites were reduced to about 30 nm and 70 nm, respectively, by the mechanical alloying for more than 12hours. The misfit strains increased with milling time UD to 240 hours, and saturated to 5.73×10^(-3) for Al and Si crystallites, respectively.
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교수-학습 지원을 위한 웹 에이전트(web agent)의 개발
강신천,한승록,박정환 한국컴퓨터교육학회 2003 컴퓨터교육학회 논문지 Vol.6 No.1
최근 에이전트를 교육에 활용하려는 연구와 노력이 시도되고 있다. 에이전트는 컴퓨터가 사용자를 대신하여 주어진 일을 수행하는 대행자(proxy)나 중개자(middle ware) 역할을 하는 컴퓨터 프로그램을 통칭하는 개념이다[1]. 근래에 다양한 장르에서 에이전트가 활용되고 있으며 교수·학습분야 역시 그러한 것 중의 하나에 해당된다. 웹 상에서 교사의 역할을 대신할 수 있는 프로그램이나 엔진의 개념이 교수·학습을 지원하는 웹 에이전트이다. 웹 상에서 에이전트는 교사의 역할을 수행할 뿐만 아니라 학습자를 도와 주는 도우미 역할을 수행한다. 웹 에이전트가 적용된 웹 기반 교수·학습 환경은 학습자나 교사에게 적응적이고 개별화된 환경을 제공한다. Recently there are many tries and researches for using web agent in education. The agent is a computer program as a common name which takes a role like a proxy or a middle ware for accomplishing the given something on behalf of user [1]. Lately the agent is being used in the various fields. The teaching and learning Is the one of those. It is the web agent that support the teaching and learning on the web. It has a concept of the program or the engine is able to do teachers roles on the behalf of him on the web. Not only the web agent is able to do teachers roles on the behalf of him, but also it is a helper that helps learners on the web. The web based teaching and learning environment has the web agent offers the personal and the adaptive information, interface, or contents.
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Silicone처리 纖維에 관한 硏究 : 水酸基를 갖고 있는 纖維의 개질을 중심으로
梁在乾,韓貞璉,姜斗煥 단국대학교 1980 論文集 Vol.14 No.-
The reactivity of hydroxyl group on PVA film, cotton, and silk with alkoxysilane and acetoxysilane was investigated. The reactivity of hydroxyl group on PVA film was increased in the order of Q_m>T_m>D_m and Q_a>T_a>D_a, and the complex treating agents such as D_m/T_m, D_m/O_m, D_a/T_a, D_a/Q_a to cotton and silk fabrics had superior effect to the simple one, such as D_m, T_m, Q_m, D_a, T_a, Q_a. Silicone contents per square centimeter of sample which has water repellency was 0.1㎎ above in PVA film, and 0.2㎎ above in the fabrics. The reaction was completly carried out under the 150∼170℃.
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안영모,오승한,이정환,김완종 순천향대학교 기초과학연구소 2001 순천향자연과학연구 논문집 Vol.7 No.2
Differentiation and development of the mouse testis were studied by light and electron microscopes from the newborn up to the adult stage. The purpose of the present study was to investigate the morphological changes of developing germ cells in seminiferous tubule and Leydig cells in interstitial tissue during the developmental process of mouse testis. The results were as follows: the seminiferous tubule diameter began to increase from 1 day and was fully developed at the 30th day after birth, particularly, the seminiferous tubule diameter was rapidly increased between 15 days and 30 days of age. Germ cells of various stages were embedded in cytoplasm of the Sertoli cell. Leydig cell contained numerous mitochondria with tubular cristae and well developed smooth endoplasmic reticulum. Spermatogonia were located close to the basal layer. Spermatocytes were connected to each other by the intercellular bridge until the late spermatid stage. An acrosome located to the head apex and the microtubule arrangement of flagellum shown the typical "9+2" pattern. At the newborn stage, the Sertoli cell and germ cells started to be already differentiated. Spermatids and immature spermatozoa were appeared at 30 days of age, and thereafter, spermatogenesis occurred actively. In conclusion, the development of mouse testis was completed after 30 days of age at which the secondary sexual characteristics and the spermatogenesis began to occur. These results suggest that ultrastructural features of developing germ cells and Leydig cell were thought to have close interrelationship with their functional accomplishment.
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이중혈류유발 심폐소생술이 심정지를 유발한 개의 단기 생존율에 미치는 영향
황성오,조준휘,강구현,김성환,문중범,이강현,이승환,윤정한,최경훈,홍은석 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3
Background and Objectives: We previously reported that, compared with standard cardiopulmonary resuscitation(S-CPR), better hemodynamic effects could be achieved by simultaneous sterno-thoracic cardiopulmonary resuscitation(SST-CPR) in which we compressed the sternum and constricted the thorax circumferentially during the systolic period by using a device. This study was designed to assess whether SST-CPR, compared with S-CPR, improve the survival rate of dogs with cardiac arrest. Subjects and methods: Twenty-five mongrel dogs(19∼31㎏) were enrolled in this study. After four minutes of ventricular fibrillation induced by an AC current, animals were randomized to resuscitate with either S-CPR(n=13) or SST-CPR(n=12). Epinephrine(1 ㎎) was injected into the right atrium every three minutes after the beginning of CPR. Defibrillation was attempted after 6 minutes of CPR. Standard advanced cardiac life support was started if defibrillation was not successful. Results: SST-CPR resulted in significantly(p<0.001) higher systolic arterial pressure(91±47 vs 47±24 ㎜ Hg), diastolic pressure(43±24 vs 17±10 ㎜ Hg), coronary perfusion pressure(35±25 vs 13±9㎜ Hg), and end tidal CO2 tension(9±4 vs 3±2 ㎜ Hg). Two of 13 animals(15 %) resuscitated with S-CPR and six of 12 animals(50%) resuscitated with SST-CPR survived until 12 hours after cardiac arrest(p<0.05). Donclusion: SST-CPR, compared with S-CPR, improves the short-term survival rate in canine cardiac arrest.
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