지중내 공동 탐지를 위한 비파괴 검사 기법에 대한 실험적 연구

유정동(Jund Dong?Yoo),양학모(Hak Mo?Yang),장기창(Ki Chang?Jang),강승민(Seung Min?Kang),조소현(So Hyun?Cho),김현기(Hyun-Ki?Kim),Seung Soo?Kim,Da Bin?Jin 대한토목학회 2018 대한토목학회 학술대회 Vol.2018 No.10

엘리트 알파인 스키 선수와 대학서클 알파인 선수의 등속성 근력 발현 특성에 대한 비교 연구

유승희,안정현,최현희 경희대학교 체육과학연구소 2001 體育學論文集 Vol.29 No.-

The purpose of this study was to compare isokinetic muscle strength between elite players and college players on alpine skiing and to offer foundamental information on characteristics of thigh muscle strength for elite players and effective training method for college club players The subjects of this study were 10 national ski players and 10 college club players. Also, the experimental instruments used were Martin's anthropometer(PKS-100, Japan), weight meter(TBF-202, Japan), and isokinetic equipment(CYBEX NORM, USA). To analyze the data, the statistical method used in this study were mean, standard deviation, and t-test using SPSS for Windows(Version 10.0.7). Based on aforementioned research method, the results of this study are as follows. 1. In peak torque, elite group was higher than college club group. Especially, right extension(p〈.05) and right flexion(p〈.01) were significant high in 240˚/sec. 2. In peak torque % of body weight, elite group was significant high on riggtㆍleft extension and flexion in 60˚/sec & 240˚/sec. 3. In angle of peak torque, elite group was higher than college club group. Especially, left extension(p〈.01) was significant high in 60˚/sec. 4. In average power, elite group was higher than college club group. Especially, right extension(p〈.05) and right flexion(p〈.01) were significant high in 240˚/sec. 5. In total work, elite group was significant high on rightㆍleft extension and flexion. However, on the muscle endurance ratio, there was no significant difference. 6. In peak torque for flexion/extension, there was no significant difference between elite group and college club group.

청각장애학생과 일반학생의 심폐기능 비교 연구

유승희,최현희 경희대학교 체육과학연구소 1997 體育學論文集 Vol.25 No.-

The purpose of this, study was to investigate and compare pulmonary ventilation, cardiorespiratory fuction of deaf person and normal person. For this purpose, 26 subjects(13 deaf person, 13 normal person) were selected. The results were as followings. 1.Pulmonary ventilation 1)The slow vitae capacity showed great significant difference(p<.05) and the predominant order of the mean value of slow vital capacity was deaf person(4.13±0.70 l). normal person(4.71 ±0.38 l). 2)The forced vital capacity showed great significant difference(p<.001) and the predominant order of the mean value of forced vital capacity was deaf person(3.84±0.67 l), normal person(4.54±0.47 1). 3)The forced expiratory volume in 1 second showed great significant difference(P<.001) and the predominant order of the mean value of forced expiratory volume in 1 second was deaf person(3.56±0.34 l). normal person(4.10±0.41 l). 4)The forced expiratory flow 200-1200ml showed great significant difference(P<.001) and the predominant order of the mean value of forced expiratory flow 200-1200ml was deaf person(7.35 ± 1.321), normal person(9.20± 1.25 l). 5)The maximal voluntary ventilation showed great significant difference(p<.05) and talc predominant order of the mean value of maximal voluntary ventilation was deaf person(119.85 ±24.98 l), normal person(152.43 ±30.39 l). 6)The precent forced expiratory volume in 1 second, forced expiratory flow 25-75%. peak expiratory flow, slow vital capacity showed no significance. 2.Cardiorespiratory function 1)The ventilation in time of maximum exercise showed great significant difference(P<.05) and the predominant order of the mean value of the ventilation in time of maximum exercise was the deaf person(103.88±18.45 l/min), normal person(122.51 ±20.18 l/min). 2)The heart rate in time of maximum exercise showed significant difference(P<.05) and the predominant order of the mean value of the heart rate in time of maximum exercise was deaf person(198.38±5.47beats/min), normal person(203.42±6.66beats/min). 3)The ventilation in time of rest, heart rate in time of maximum exercise, oxygen pulse in tilde of maximum exercise and rest, oxygen consumption in time of maximum exercise and rest, carbon dioxide production in title of maximum exercise and rest, oxygen consumption per kg body weight in time of maximum exercise and rest, tidal volume in time of maximum exercise and rest, respiratory rate in time of maximum exercise and rest. showed no significance.

임상증례중심 성인 전문적 심장구조술 교육과정에 대한 고찰

유은영,박승현,박규남,최세민,김세경 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.2

Background: To describe the first experience of case-based advanced cardiac life support(ACLS) course in Korea. Methods: We have given case-based ACLS course to 13 nurses(6 emergency nurses, 4 coronary care unit nurses, 3 professors) and 17 physicians(4 emergency physicians, 12 emergency residents, 1 intern). We performed the case-based ACLS course according to 1992 American Heart Association guidelines and recommendations for advanced cardiac life support by american ACLS instructors(1 pulmonologist, 4 critical care nurses). We performed final theoretical written test and 2 times written survey (immediate and 100th day after the course) about the course. Results: On final written test, all practitioners answered at least 70% of the questions correctly. There was no significant difference between nurses and physicians(86.2±3.6 of physicians and 82.5±6.8 of nurses, p=0.06). 90% of participants considered that case-based advanced cardiac life support was acceptable. 100th day after the course, 93% of participants answered that ACLS course have been helpful on his/her job and also want retraining of ACLS course. 70% of participants considered that ideal ACLS training committee in Korea is the Korean Society of Emergency Medicine. Conclusion: Case-based ACLS course is a useful educational method for physicians and nurses in Korea. In the future, we should organize Korean resuscitation committee and then make guidelines for ACLS, and then continuously educate physicians and nurses.

치수/치근단 질환에 이환된 영구치의 치수 조직 재생과 치근 형성

유연지,백승호,손호현 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.4

최근 치수 질환 또는 치근단 질환을 가진 미성숙 영구치에 대한 보존적 치료의 방법으로 여러가지 근관 내 소독 약제를 이용하에 증상 개선은 물론 치근의 성장 및 치수의 재생이 이루어진 증례들이 보고되고 있다. 그 기전에 대해서는 아직 명확하게 밝혀지지는 않았지만 여러가지 줄기 세포 또는 미분화 간엽 세포들이 관여하는 것으로 생각되며, 실제로 재생된 조직에서는 대부분백악질양또는골양물질의 침착이 관찰되고 있다. 이 새롭고보존적인 치료접근 방법은 다능성 줄기 세포와 다양한조직 공학 기술에 대한 연구와 더불어, 재생적 근관 치료에 더 밝은 비전을 제시하고 있다. Numerous cases about additional growth of roots or pulp tissue regeneration by using various intracanal medicaments in immature permanent teeth with periapical or pulpal disease have been reported. The underlying mechanism has not been clearly delineated. but it has been widely accepted that undifferentiated mesenchymal cells and stem cells are involved. Moreover, the growth and deposition of osteoid or cementoid tissues have been observed in regenerated pulp and roots. This new and non-invasive treatment has brightened the future of endodontics. and enlarged the vision of regenerative root canal treatment with multi-potent stem cells and various tissue engineering techniques.

국산 EXTENSOMETER의 개발에 관한 기초 연구

유현승,김갑용,김두만 한국 항공대학교 항공산업기술연구소 1999 航空宇宙産業技術硏究所 硏究誌 Vol.9 No.-

본 연구는 구조물의 측정에 이용되는 Extensometer를 국산화하는 것을 목적으로하였다. 외국의 시방서를 참고로 스트레인게이지를 이용하여 시제품을 제작하였다. 수감체는 알루미늄 합금을 사용하여 최대용량을 4 Kgf로 하였다. 시제품을 제작하고 정적인 Calibration 을 한 후 성능 평가를 하였다. 성능 평가는 알루미늄 시편에 시제품을 고정시키고 MTS로 반복하중을 가하는 방법으로 하였다. 시제품의 성능은 단일축 게이지보다 4배의 출력을 보였다. 또 최대하중의 5%의 하중을 8시간(약10000회)동안 반복적으로 가하였다. 이때 실험전과 실험후의 출력이 일정한 값을 보였다. 앞으로 실제 구조물을 측정할 수 있는 용량의 Extensometer를 제작하기 위하여 Extensometer의 재료와 열처리 기술에 대한 연구가 필요하겠다. 또 실제구조물을 측정하고 그 실용성을 평가해 보겠다. In this paper, the technique to make our own's extensometer is studied. The extensometer is to measure a structure. The prototype is manufactured by using a strain-gauge with the help of a foreign manual. The capacity of sensing part in aluminum alloy is 4 Kgf. The prototype is estimated after static calibration is done. The MTS is used to estimate the protype. The ability of a prototype is 4 times than it of an uniaxial strain-gauge. The 5 percent of maximum force is loaded repeatedly for 8 hours. The result shows that experiment is equal to theory. Later, the material of an extensometer and the technique of heat treatment must be studied to measure a real structure.

이면성 및 도플러 심초음파도를 이용하여 진단한 선천성 거대 좌회선지-좌심실 관동맥루

진승원,박준철,이영중,유병현,박현옥,김용주,윤호중,김재형,홍순조,최규보,권종범,원용순,박건 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

부착성 동물세포의 Scale-up을 위한 방법의 개발

김승모,송상호,최명락,유은정,임현수 여수대학교 1997 論文集 Vol.11 No.2

This study was a protocol of serial propagation for anchorage-dependent animal cell. Vero. by the optimization of trypsin and EDTA concentration in T-25 flask. Commen enzymetic treatment in PBS solution has been modified for a high degree of cell datachment from T-25 flask and for transfer of a maximum number of viable cells from one culture to the next during the scale up process. Culture of Vero cells were washed with Dulbecco's modified Eagle's medium(DMEM) and then exposed to DMEM containing trypsin(0.025%) and EDTA(0.16%). Up to 90% of cells detached from bottom of flask and the viability of cells was greater than 93%. The protocol using the developed method was successfully applied to the next 10 times scale up process. Consequently, the developed method changed multiple steps of processes to one step, so it promised th easy scale-up and low cost demand of animal cell culture.

자연 치관과 포세린 치관상에서 교정용 브라켓 부착시 전단 결합 강도와 파절 양상에 관한 비교 연구

이현선,김종수,유승훈 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.2

치아 우식증과 침식증의 진단과 본 연구는 교정용 밴드 사용의 대안으로 제시된 직접 부착 술식이 보철 치료를 받은 치아상에서도 적절한 결합 강도를 갖으면서 임상적으로 유용하게 사용될 수 있는지를 평가하고,불산과 포세린 전처리제의 사용 여부에 따른 결합 강도와 접착 파절 양상의 차이에 대해 알아보고자 시행하였다. 사람의 상하악 소구치 치관 20개를 대조군으로, 소구치의 협면을 복제한 포세린 치관 80개를 실험군으로 나눈 후,대조군은 37% 인산으로 산부식한 후 Transbond XT^(??)를 이용하여 금속 브라켓을 접착하였고,실험군들은 모두 포세린 치관에 통상적으로 sandblasting 처리를 하되,9.6% 불산으로 4분간 부식처리를 함께 한 군,포세린 전처리제를 적용한군,마지막으로 sandblasting과 불산 그리고 포세린 전처리제를 모두 적용한 군으로 20개씩 나눈 후 금속 브라켓을 접착하였다. 각 군간 전단 결합 강도와 접착 파절 양상을 비교하여 관찰한 결과,포세린 치관에 금속 브라켓을 접착할 시,기존의 비심미적인 밴드를 사용하지 않더라도 sandblasting과 불산 그리고 포세린 전처리제를 이용한 직접 부착 술식으로 임상적으로 유용하게 사용될 수 있음을 알 수 있었다. Orthodontic brackets often need to be bonded to porcelain such as porcelain fused to metal crowns and porcelain jacket crowns. The purpose of this study was to evaluate the clinical usability of direct bonding system on porcelain teeth by measuring shear bond strength according to various conditions and observing adhesive failure patterns. The specimens, 20 maxillary premolars and 80 porcelain teeth that were produced by duplication of the labial surface of a maxillary first premolar were used and randomly divided into four groups of twenty teeth each. The 5 different preparation procedures tested: (1) application of 37% phosphoric acid on natural teeth, (2) sandblasting on porcelain surfaces, (3) sandblasting and application of 9.6% hydrofluoric acid on porcelain surfaces, (4) sandblasting and application of silane on porcelain surface, (5) sandblasting and application of 9.6% hydrofluoric acid and silane on porcelain surfaces. The metal brackets were bonded with Transbond XT^(??) bonding material. The shear bond strength was tested by the micro universal testing machine(Kyung-Sung, Korea) and the amount of residual adhesive on the tooth surface after debonding was examined by stereoscope and assessed with an adhesive remnant index. The results of this study suggest that the direct bonding system on porcelain teeth with sandblasting, HF and porcelain primer is clinically useful.

초음파검사의 수치적 모델링 기법 : 유한차분법 및 유한요소법

임현준,유승현 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.2

초음파검사에서 발생하는 물리적 현상의 복잡성을 고려할 때, 이를 이론적으로 모델링하기 위해 수치적인 기법을 이용하는 것이 효과적인 경우가 많다. 본 논문에서는 초음파검사를 수치적으로 모델링하는 기법들에 대하여 개괄적으로 살펴보고, 특히 유한차분법과 유한요소법에 대하여 상세히 알아본다. 즉, 유한차분법과 유한요소법을 이용한 해석의 개요를 설명하고, 이들의 적용시 고려사항 및 문제점에 대해 알아 본 후, 기존의 연구결과 중 중요한 것들을 참고문헌으로 열거하고 몇 가지 예를 소개한다. 계속되는 컴퓨터의 기술적 발전으로 인하여 초음파검사에 대한 수치적 모델링 기법의 신뢰성과 편의성이 지속적으로 증대될 것으로 기대된다. Due to the great complexity of the physical phenomena involved in most ultrasonic nondestructive testing, the numerical method is effective in many cases of their theoretical modeling. A brief overview is provided in this paper of the numerical methods used in modeling ultrasonic nondestructive testing, with an emphasis on the finite difference and the finite element methods. The procedures of execution, special considerations required, and some previous research results of the finite difference and the finite element methods are presented, with a rather extensive list of work reported in the literature. These numerical modeling techniques for ultrasonic nondestructive testing are expected to be more reliable and more convenient, as a result of the continuing technological development of computers