전력 계통에의 이용을 위한 후프 에너지 저장 시스템

백광현(Kwang Hyun Paek),정기형(Kie Hyung Chung) 한국태양에너지학회 1995 한국태양에너지학회 학술대회논문집 Vol.- No.-

한국에 있어서의 하루 동안의 부하 평준화를 중심으로 전력 계통에의 적용을 목적으로 한 후프 에너지 저장에 관하여 논의하였다. 동일 목적을 위한 다른 여러 경합 방식들과의 비교가 이루어졌으며 이로부터 후프 에너지 저장의 실제 적용 가능성을 제시하고 1994년의 전력 수급 현황을 자료로 하여 일차적인 적정 시스템 변수의 도출이 이루어졌다. 또한 이의 적용을 위해 필수적인 관련 기술로서 자기 압력을 이용한 비접촉성 지지 방식 및 대용량의 전력 변환 방식등에 대해 논의하였다. Hoop Energy Storage System(HESS) for electric power utility were discussed laying primary stress on the diurnal load leveling of Korean electric power system. A number of potential storage technologies are outlined and possibility for real application of HESS was suggested. Primary system variables were determined on the basis of state of electric power demand-supply of 1994. As a prerequisite technology for HESS, noncontacting support using magnetic pressure and high power conversion were discussed.

해양화학생물산업의 현황과 전망

이선복(Sun Bok Lee),조선자(Sun Ja Cho),이신엽(Shin Youb Lee),백광현(Kwang Hyun Paek),김정아(Jeong A Kim),장진화(Jin Hwa Chang) 한국생물공학회 2009 KSBB Journal Vol.24 No.6

21세기에 들어서면서 해양에 대한 인식은 해양선진국들을 중심으로 하루가 다르게 변모하고 있으며, 석유 및 육상 자원의 고갈의 가속화로 인하여 해양의 중요성은 점차 커져가고 있다. 지속가능한 발전을 위해서는 해조류, 해수 등과 같은 해양자원으로부터 산업용 화학품, 신소재, 연료, 희귀 금속 등의 생산을 가능하게 하는 해양화학생물산업의 개발이 절실히 필요해지고 있다. 본 글에서는 해양화학생물산업 분야 중 세계적으로 각광 받고 있으며 우리나라에서도 발전 가능성이 큰 분야인 해조다당류산업, 해양신소재산업, 해양 바이오연료산업, 해양제염산업, 해양심층수산업 등 다섯 분야를 선정하고 이들 분야의 현황과 전망을 소개하였다. 각 분야별 소개는 산업발전 역사, 기술개발 수준, 산업화 정도를 포함하고 있으며, 국내외 산업경향과 앞으로의 발전 가능성을 조사하였다. 분석결과, 해양화학생물산업기술의 발전을 위해서는 해양생물공정 개발에 대한 적극적인 연구 개발 투자와 해양생물과학자들과 생물화학공학자들간의 협력 연구가 앞으로 더 많이 필요하기는 하지만 해양화학생물 산업의 미래전망은 매우 밝은 것으로 나타났다. As we move into the 21st century, the importance of marine resources is certain to increase due to the accelerated exhaustion of land resources. For the sustainable development of the world, therefore, we need to develop marine chemical bioindustries which enable us to produce industrial chemicals, advanced materials, fuels, and minerals from marine resources such as seaweeds and seawater. In this review, we selected five marine chemical bioindustries which include 1) seaweed polysaccharide industry, 2) marine advanced materials industry, 3) marine biofuel industry, 4) marine sea salt industry, and 5) deep-sea water industry, and discussed the current status and future prospects of each industry sector. It has been assessed that the future of marine chemical bioindustry looks very promising although there are many needs for more intensive research investments on marine bioprocess development through close cooperation between marine biologists and biochemical engineers.

패러글라이딩 전방이륙시 라이즈-업 동작의 키네매틱 분석

김의환,조효구,백광현 한국운동역학회 2000 한국운동역학회지 Vol.9 No.2

본 연구는 항공스포츠 중 몇 년 사이에 급속도로 발전한 패러글라이딩(paragliding)의 전방이륙(take off)기술 중 라이즈-업(rise-up) 동작에 관한 키네매틱 변인의 기초자료를 얻는데 그 목적이 있다. 연구의 목적을 달성하기 위하여 대한패러글라이딩협회에 등록된 Y.대학 남자선수 10명을 대상으로 라이즈-업 동작을 각 5회씩 실시하여 연구자가 그 중에서 가장 잘된 동작 1회를 비디오 테입에 편집하여 국내 패러글라이딩 전문가에게 평가를 의뢰하여 상위 5명을 선정한 후 키네매틱 변인을 분석하였으며 결과는 다음과 같다. 시간변인에 있어서 제 1국면이 전체 소요시간 중 57.45%(1.53sec)가 걸렸으며 2국면의 소요시간이 길수록 전체시간이 증가하는 것으로 나타났다. 거리변인에서는 제 2,3국면보다 제 1국면에서의 소요거리(2.25±0.36cm)가 51.49%로 가장 길게 나타났다. 각도변인에 있어서 팔꿈치각은 어깨각과 함꼐 상호 보상작용을 통한 캐노피의 균형을 유지하는 역할을 수행하는 것으로 나타났으며, 발목각은 피험자 개개인의 신장과 보폭의 차이에서 발생하는 편차가 종목 특성으로 큰 차이를 보였다. 또한, 상체 전경각에 있어서 저항이 큰 Cg이벤트에서 굴곡이 이루어졌다가 Hp이벤트에 와서는 신전 시킨 후 캐노피와의 견제를 위한 굴곡이 다시 이루어진 것으로 나타났다. 속도변인으로는 신체중심의 속도변화에서 출발신호와 함께 진행방향의 역방향으로 -0.02m/sec의 탄력적인 신체중심의 준비형태를 보였다. The purpose of this thesis is to investigate the basic Data Bases which were based on the rise up motion through kinematic variables analysis of rise up motion among the take off technique of the paragliding. To understand this thesis I made use of three dimensions cinematography through DLT method and also analyzed the kinematic variables through velocity variables, distant variables, angle variables and temporal variables. Therefore the conclusion were as follow The first phase is time required of use 57.46%(1.53sec) the total of the time, and second phase of the time longer than increase of the total time. For the first phase distance required of use 51.49%(2.25±0.36m) longer than second and third phase. In case of the valicity change of center of gravity of each events was showed toward -0.02m/sec.

골프 Putting 동작 시 프로선수와 아마추어간의 3차원 운동학적 변인 비교분석

김의환,박정현,백광현 한국운동역학회 2001 한국운동역학회지 Vol.10 No.2

The purpose of this study was to compare of the kinematic variables, as competition situation putting stroke(PS) between Korean pro. and ama.- golfers, by the 3 dimensional analysis. The subjects were three pro-golfers who are competitioning in the fields and three ama.-trainees. Kinematic variables(temporal, distance, and velocity variables of golf club-head) were computed through motion analysis system, by videography(30f/s. from the front and side view). From the data analysis and discussion, conclusions were as follows : 1. Temporal variables : The elapsed time(ET) during PS, pro(1.32sec.) was 0.10 sec. longer than ama.(1.22sec.), the ratio comparison of ET each phase during PS, pro(0.40sec.,30.38%) was 6.28% longer than ama.().30sec. 24.1%) in back-swing phase, pro(0.25sec, 17.7%) was 4.2% shorter than ama.(0.27sec., 21.9%) in down-swing phase, ratio of ET in backswing and downswing was average 1.60 : 1 by pro., and 1.11:1 by ama.-golfers, respectively. 2. Distance variables : The distance of club-head during PS, pro.(21.8cm) was 10.2cm shorter than ama.(32.0 cm), distance of 2nd half part in PS from impact to follow through top, pro.(46.2cm) was 11.6cm shorter than ama.(57.8cm), distance of 2nd half part of PS, pro(46.2/21.8cm) was 2 times over than 1st half part, ama.(32.0/57.8cm) was 2 times under than 1st half part, respectively. 3. Velocity variables : The velocity of club-head during PS, pro.(1.21m/sec.) was 1/2 times slower than ama.(2.37m/sec.) in over all, BS, DS and FT in PS, pro.(0.9, 1.6, and 1.15m/sec.) was slower than ama.(1.95, 3.19 and 1.96m/sec.), respectively. Over all, pro. was more stable than ama. in PS. <end>

테니스 양손 백핸드 드라이브동작의 중심, 속도변인의 키네메틱분석

김의환,성영호,김성섭,백광현 龍仁大學校 體育科學硏究所 2003 體育科學硏究論叢 Vol.13 No.1

The purpose of this study was to analysis the kinematic variables of two-handed backhand drive in tennis pretending just as real competition situation. Two male Korean juvenile top player who was gold medalists and award in national championships 2000, was filmed on 16㎜ high speed cameras(Photo-sonic co., l00fps, from the front, side view) on performing in two-handed backhand drive in tennis stroke throughout the ball machine(Lob star co., 50㎞/h. on ball speed) by the method of three-dimensional analysis. The kinematic variables, temporal, posture, center of gravity and ball velocity were computed through film analysis. The results were as follows; 1. Center of gravity(COG) variables : The COG of right and left in horizontal aspect showed the large move to the left, and when follow through, subject A had a move to the left, and subject B had a move to the right(6.4cm) slightly. The COG of forward and backward in horizontal aspect showed that subject A had a move to the backward, and subject B had a move to the forward, and until impact, they moved to the forward When follow through, there was a move to the backward, and it showed a trend that subject A was a defensive style and subject B was an offensive style. The COG of up and down in vertical aspect was 88.lcm - 93.3cm in height from the ready position to the follow through, and when stroke, the COG of up and down showed the movement range, 5.2cm. 2. Ball velocity variable : The maximum returned ball speed right after the impact was shown after about 0.036sec., and at this time, subject A had 38.4m/sec., and subject B had 34.5m/sec. respectively. The variable influencing on the ball speed was the variable of posture such as the elbow angle, the shoulder angle and also including the variable of COG in the forward and backward.