다공성 3차원 Ti 지지체의 제조 및 알카리처리에 따른 생체활성 평가

안상현,김승언,김교한,윤희숙,현용택,An, Sang-Hyun,Kim, Seung-Eon,Kim, Kyo-Han,Yun, Hui-Suk,Hyun, Yong-Taek 한국재료학회 2009 한국재료학회지 Vol.19 No.7

Ti scaffolds with a three-dimensional porous structure were successfully fabricated using powder metallurgy and modified rapid prototyping (RP) process. The fabricated Ti scaffolds showed a highly porous structure with interconnected pores. The porosity and pore size of the scaffolds were in the range of 66$\sim$72% and $300\sim400\;\mu$m, respectively. The sintering of the fabricated scaffolds under the vacuum caused the Ti particles to bond to each other. The strength of the scaffolds depended on the layering patterns. The compressive strength of the scaffolds ranged from 15 MPa to 52 MPa according to the scaffolds' architecture. The alkali treatment of the fabricated scaffolds in an aqueous NaOH solution was shown to be effective in improving the bioactivity. The surface of the alkali-treated Ti scaffolds had a nano-sized fibre-like structure. The modified surface showed a good apatite forming ability. The apatite was formed on the surface of the alkali treated Ti scaffolds within 1 day. The thickness of the apatite increased when the soaking time in a simulated body fluid (SBF) solution increased. It is expected that the surface modification of Ti scaffolds by alkali treatment could be effective in forming apatites in vivo and can subsequently enhance bone formation.

경사에 따른 산불의 확산속도

안상현,신영철,An. Sang-Hyun,Shin. Young-Chun 한국방재학회 2008 한국방재학회논문집 Vol.8 No.4

현재는 기술적인 발전을 토대로 정보의 요구수준이 상당부분 증대되었으며 GIS (Geographic Information System)분야 또한 더 많은 정보를 보다 신속하고 정확하게 처리 되어지고 있다. 특히 산불에 있어서는 산불발생시 공간적으로 넓은 지역을 신속히 분석하여 진화의 기초자료로 활용함으로써 환경적, 경제적, 인명적 피해를 최소화하고 대피경로, 확산경로 및 진화자원의 효율적 배치를 결정하는데 필수적이다. 이러한 산불확산에 영향을 미치는 인자 중에서 경사에 따른 산불확산속도를 규명하기 위하여 경사 및 경사방향에 따른 실험을 실시하였다. 실험결과 상향경사의 경우 경사가 증가할수록 시간이 감소하고, 하향경사에서는 증가하는 경향을 나타내었다. 실험결과 값을 토대로 상향경사는 (+), 하향경사는 (-)로 구분하여 경사에 따른 산불확산속도를 계산하였으며, 이러한 결과는 정확한 산불확산예측을 하는데 기여함으로써 효과적인 산불진화에 도움을 줄 수 있을 것으로 판단된다. As Information Technology developed, Information requirement has been went higher. In the field of GIS(Geographic Information System) more information is processed more quickly and accurately. Especially, quick analysis of forest fire information (topography, ignition point, weather condition, etc.) over a wide area is essential in order to minimize victim, environmental damage, and economical damage, decide course of evacuating, estimate a fire spread course, and attack resource arrangement. We determined a fire spread distance at each unit time through an experiment with various slope degrees and distinction of flat, upslope and downslope. For the tests on the upslope, as the slope increased, the rate of spread increased. On the downslope in contrast with the upslope, as the slope increased, the rate of spread decreased. We analyzed a spread rate of forest fire on each slope as the method classified upslope(+) and downslope(-) using the results obtained from the experiment. Consequently, the proposed method is able to be used to effectively support the attack of forest fire by providing accurate predictions of fire spread.

산불확산모델링에 적합한 경사계산 알고리즘 개발

안상현 ( Sang Hyun An ),강용석 ( Yong Seok Kang ),손영기 ( Young Gi Son ),이시영 ( Si Young Lee ),신영철 ( Young Chul Shin ) 한국지리정보학회 2007 한국지리정보학회지 Vol.10 No.2

스포츠용품기업에 대한 사회적 책임활동과 공중관계성이 기업명성에 미치는 효과

안상현(An, Sang-Hyun),허철무(Heo, Chul-Moo) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.4

The purpose of this study was to examine the effect of sport goods company’s corporate social responsibility and public relationships on corporate reputation focused on students majoring in physical education. Total of 229, students majoring in physical education participated in this study. The results were as follows. First, sport goods company’s corporate social responsibility influenced positively on public relationships. Second, sport goods company’s corporate social responsibility influenced positively on corporate reputation. Third, sport goods company’s public relationships influenced positively on corporate reputation.

신체활동에 참여하지 않는 노인들의 건강위험지각이 자기효능감과 건강운동 참여의도에 미치는 효과

안상현(Sang Hyun An) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.53

The purpose of this study was to investigate the effect of health risk perception on self-efficacy and intention to physical activity participation focused on elderly not participated on physical activity. Total of 266 elderly not participated on physical activity were used for analyses. The results of this analyses were as follows: 1) female elderly showed high scores on perceived susceptibility and perceived barriers than male elderly. 2) perceived benefit positively influenced on self-efficacy. But perceived barriers significantly influenced not on self-efficacy. 3) perceived benefit positively influenced on intention to physical activity participation. And perceived susceptibility negatively influenced on intention to physical activity participation. 4) self-efficacy positively influenced on intention to physical activity participation.

인터넷 건강정보이용에 대한 관여도와 건강정보 이용정도가 자아효능감과 건강정보 이용지속의도에 미치는 영향

안상현(Sang Hyun An) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.54

The purpose of this study was to analyze the effect of involvement and level of usage of internet health in - formation on self-efficacy, information acceptance intention. 321 samples through convenient sampling method were adopted as a final data. Confirmatory factor analysis, correlation analysis, reliability analysis and structural equation model analysis utilizing SPSS WIN Ver 15.0 and IBM AMOS 20. The results were as follows; First, high-involvement group showed high scores on self-efficacy and acceptance intention. Second, level of usage internet health information influenced not on self-efficacy and acceptance intention. Third, the main effect of involvement of health information was found on self-efficacy and acceptance intention. Fourth, involvement of health information influenced significantly on self-efficacy. Fifth, involvement of health information and selfefficacy influenced significantly on acceptance intention.

필라테스 기구유형별 만성요통 여성고령자의 요부근력, 근육경직도, 기능장애지수에 미치는 효과

안상현(An, Sang-Hyun) 한국체육과학회 2022 한국체육과학회지 Vol.31 No.5

The purpose of this study was to investigate the effects of Pilates instrument exercise on the lumbar muscle strength, muscle stiffness, and dysfunction index by instrument type in female elderly with chronic low-back pain during a 12-week session. A total of 32 subjects were randomly allocated to 8 per group. Based on the data collected through pre- and post-measurement, repeated two-way analysis of variance and Cohens D value calculation were performed to draw the following conclusions. First, the 12-week sessions effect on lumbar muscle strength of female elderly with chronic low-back pain showed a significant difference in the interaction effect, comparison group a and comparison group b showed a relatively large effect, and the Cadillac apparatus was found to be the optimal exercise apparatus for improving the lumbar muscle strength for the female elderly with chronic low-back pain. Second, in the effect on muscle stiffness of the female elderly with chronic low-back pain during a 12-week session, the right quadratus lumborum muscle showed a significant difference in the interaction effect, and comparison group a and comparison group b showed a relatively large effect. It was also confirmed that Reformer was the optimal exercise apparatus for improving the right quadratus lumborum muscle for the female elderly with chronic low-back pain. In addition, in the effect on right gluteus medius, there was a significant difference in the interaction effect, comparison group a and comparison group b had a relatively large effect, and Cadillac was found to be the optimal exercise apparatus for improving the right quadratus lumborum muscle in female elderly with chronic low-back pain. Third, the effect on the dysfunction index of the female elderly with chronic low-back pain during a 12-week session showed a significant difference in the interaction effect. The comparison group a and comparison group b showed a relatively large effect. And it was confirmed that Reformer is the optimal exercise apparatus for improving the dysfunction index for the female elderly with chronic low-back pain.

신체활동 참여가 심리적 부적응과 학교생활적응에 미치는 영향

안상현(Sang Hyun An),허철무(Chul Moo Heo) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.57

The purpose of this study was to investigate the effect of phyicsal activity on psychological maladjustmen tand adjustment to school life focused on the experience of school violence in adolescents. The subjects in thisstudy were 365 students(180 participants and 185 non-participants) selected. The findings of this study wereas follows; First, physical activity non-participants showed hgih scores on depression and impulse, physica lactivity participants showed high scores on school class/relaotinship with teacher. Second, participation timeand duration of adolescents participating in physical activity had not effect on maladjustment and adjustment toschool life. Third, depression of adolescents had a effect on impair school class/relationship with teacher, depressionof adolescents had a effect on impair friendship.

논문 : 의성군지역 산불발생 및 대형화 위험지역 구분

안상현 ( Sang Hyun An ),원명수 ( Myoung Soo Won ),김동현 ( Dong Hyun Kim ),강영호 ( Young Ho Kang ),이명보 ( Myung Bo Lee ),이시영 ( Si Young Lee ) 한국지리정보학회 2005 한국지리정보학회지 Vol.8 No.2

고령여성의 복합운동이 기능체력, 인지기능 및 혈중지질에 미치는 영향

안상현(An, Sang-Hyun),최영철(Choi, Young-Chyul) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.2

The purpose of this study was to investigate the effect of combined exercise on functional fitness, cognitive function and blood lipids in elderly women. The exercise program was performed at a frequency of 3 times per week for 8 weeks. Each exercise session consisted of 10 minutes of warming up, 10 minutes of cooling down and 40 minutes of combined exercise. Based on these objectives and experimental procedures, the following conclusions were obtained. First, 8 - week combined exercise showed significant interaction effect on upper body strength and lower body strength in exercise group and control group in comparison of functional fitness of elderly women. Second, significant interaction was found in finger selection reaction, numerical memorization, and numeric - code change in exercise group and control group. Third, there was a significant interaction effect between HDL and LDL in exercise group and control group.