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탐방객 적정수용력 연구 : 순천만 자연생태공원을 중심으로
이대종(Dae Joong Lee),구철현(Cheul Hyun Koo),조계중(Kye joong Cho) 한국산림휴양학회 2012 한국산림휴양학회지 Vol.16 No.1
본 연구는 순천만 자연생태공원을 중심으로 탐방인원을 파악, 분석하여 적정한 물리적·관리적 수용력을 연구하여 보다 나은 공원 관리를 할 수 있도록 하는데 그 목적이 있다. 탐방객의 수치 파악은 2010년 10월 1일부터 12월 4일까지 09:00시부터 18:00시까지 순천만 자연생태공원을 찾은 탐방객을 중심으로 불특정한 날짜를 선출하여 조사원들이 직접 계수 하였다. 분석 결과 물리적 수용력의 활동시설수용력은 1,160명, 체류시설수용력은 2,169명으로 분석되었고, 1년간 약 120만 명의 탐방객을 예측할 수 있었다. 관리적 수용력을 산출하면 일별 탐방객이 36,331명으로 나타났고, 각 시설물 별 초과비율의 합은 56%로 조사되었고, 이 값을 관리적 수용력 구하는 수식[36,331*(1-0.56)]에 대입하면 15,985.6명으로 분석되었다. 본 연구는 순천만의 탐방객의 수요를 예측하여 적정한 관리를 할 수 있는 방안을 제시하였다. This study aims to identify and analyze the visitors, centered Suncheon Bay Natural ecological park, and to research appropriate physical and managerial capacity and thus to make a better management. The number of visitors are measured directly by the researchers, who select unspecified one-day, falling on from 9:00 A.M to 6:00 P.M., Oct 1 ~ Dec. 4, 2010. centered Suncheon Bay Natural Ecological Park. The result shows that activity facility capacity for physical capacity is 1,160, and stay facility capacity is 2,169 people. For one year, 1,200,00 people are expected to visit the park. Managerial capacity shows visitors of 36,331 on a daily base. The total of excess ratio for each facility turns out to be 56%. After this value is substituted with the formula [(36,331 * (1-0.56)] calling for managerial capacity, the outcome shows 15,985.6 people. This study indicates the prediction of prospective visitors of Suncheon Bay and the methods of proper management.
PEDOT:PSS기반 잉크젯 프린팅 스트레인 게이지의 제작
계지원 ( Ji Won Kye ),한동철 ( Dong Cheul Han ),신한재 ( Han Jae Shin ),염세혁 ( Se-hyuk Yeom ),이왕훈 ( Wanghoon Lee ) 한국센서학회 2017 센서학회지 Vol.26 No.1
This paper presents the Inkjet-printed strain gauge using PEDOT:PSS. The strain gauge (width 0.6 mm, length 20 mm, thickness 0.3 μm) was printed on the PET film using PEDOT:PSS ink. The resistance variation of the fabricated strain gauge was measured by the digital multi-meter with the displacement range of -4 to 10 mm. As the measured result, resistance variation (ΔR/R<sub>0</sub>) has approximately 0.75%, linearity of 99.87%. The fabricated strain gauge is expected to the various applications such as tape type pressure sensor, PMS(pressure mapping sensor), wearable devices.
잉크젯 프린팅 기술을 이용한 플렉서블 온,습도센서 개발
계지원 ( Ji Won Kye ),한동철 ( Dong Cheul Han ),신한재 ( Han Jae Shin ),김헌곤 ( Heon Gon Kim ),이왕훈 ( Wang Hoon Lee ) 한국센서학회 2015 센서학회지 Vol.24 No.2
This paper presents the inkjet-printed flexible temperature and humidity sensor(F-TH sensor) using PEDOT:PSS. The series, mesh and parallel type sensing element using PEDOT:PSS ink was printed on the overhead projector(OHP) film. The fabricated sensor of each structure has the temperature sensitivity of 140 Ω/℃, 29 Ω/℃ and 1.4 Ω/℃ with linearity, respectively. Also the fabricated sensor was not only possible to measure a temperature, but also to detect humidity. The humidity sensitivity of 400 Ω/%RH, 3.4 Ω/%RH and 3 Ω/%RH with linearity, respectively. The fabricated F-TH sensor is expected for the various applications such as electronic devices, bio-healthcare, industrial field.
권영필,이계철,Kwon Young-Pil,Lee Kye-Cheul 대한설비공학회 1987 설비저널 Vol.16 No.2
The heat transfer characteristics from a solid sphere in a fluctuating air flow is simulated numerically in the range of the Reynolds numbers, $1\;{\leqslant}\;Re\;{\leqslant}\;40.$ Such a situation may be encountered in forced convection from a heated spherical particle in a sound field or oscillat-ing flow. The amplitude and phase delay in the heat transfer response to the flow oscillation are computed for a small amplitude flow. The instantaneous response of heat transfer is simulated for the large amplitude oscillation and compared with the quasi-steady response. The effect of the oscillation on the time - mean value in the local and overall heat transfer rate is discussed along with the change in the flow .field.
용매열처리에 따른 PEDOT:PSS 암모니아 가스 감지막 특성 변화
노왕규 ( Wang Gyu Noh ),염세혁 ( Se-hyuk Yeom ),이왕훈 ( Wanghoon Lee ),신한재 ( Han Jae Shin ),계지원 ( Ji Won Kye ),곽기섭 ( Giseop Kwak ),김세현 ( Se Hyun Kim ),류시옥 ( Si Ok Ryu ),한동철 ( Dong Cheul Han ) 한국센서학회 2017 센서학회지 Vol.26 No.2
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been extensively studied as the active material in ammonia gas sensor because of its fast response time, high conductivity and environmental stability. It is well known that a post annealing process for organic devices based on PEDOT:PSS significantly increases the device performance. In this study, we propose the solvent annealing of PEDOT:PSS and investigated its effects. As a results, post solvent annealing on PEDOT:PSS lead to the surface chemical and physical properties change. These changes result in improved conductivity of the PEDOT:PSS. In additional, ammonia sensitivity of solvent annealed PEDOT:PSS become higher than pristine polymer film. The enhancement is mainly caused by the depletion of gas barrier PSS and structural re-forming PEDOT networks. We believe that the post solvent annealing is a promising method to achieve highly sensitivity PEDOT:PSS films for applications in efficient, low-cost and flexible ammonia gas sensor.
나병철(Byungchul Na),김진용(Jinyong Kim),서준호(Joonho Seo),이계철(Kye cheul Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fuel filter in common rail engines are equipped with special heating system because of wax and paraffin components in diesel fuel can be solidifies at low fuel temperature. The solidified components blocks fuel supply to the high pressure fuel pump according to the filter element filling. In case of common rail direct injected engines, fuel blocking may cause serious damage to high pressure pump because of fuel pump is lubricated by fuel itself. The extremely narrow clearance between plunger and barrel can be directly contacted if discontinuous fuel supplies. This study focuses on evaluation technologies for heating element type diesel fuel filters that can improves fuel flow at low temperature. Flow capability, power consumptions and pressure drop has been estimated in a specially made fuel delivery testing system.