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재실자 온열쾌적평가에서 인체의 생리적 반응을 고려한 심박변이도 측정 및 분석 방법 비교 연구
임재한(Lim JaeHan) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.3
Thermal comfort in humans has been evaluated using predicted mean vote (PMV) based on factors such as clothing and activity levels of an individual to address their satisfaction with the thermal environment. However, PMV does not consider the physiological and psychological factors associated with thermal comfort. A person may feel dissatisfied in an environment that is thermally comfortable for others; this can be calculated by applying heart rate variability (HRV) to the comfort index by measuring the ECG data of the body. Currently, various types of wearable IoT sensors are available for measuring HRV characteristics. In this study, we analyzed the HRV parameters in the human body to evaluate the thermal comfort of the occupant. A data measurement and analysis method using different HRV sensors was developed to determine the feasibility of HRV as a physiological response to the thermal comfort model of the occupant. The characteristic changes in the measured HRV values were analyzed in standard indoor and outdoor environmental conditions.
부유식 파력-해상풍력 복합발전 구조물의 해상풍력발전기 하부 구조 설계 및 강도 평가
임재한(Jaehan Lim),김대현(Daehyeon Kim),오근원(Keunwon Oh),정한별(Hanbyul Jeong),유병석(Byeongseok Yu),홍기용(Keyyong Hong),이강수(Kangsu Lee) 한국해양환경·에너지학회 2016 한국해양환경·에너지학회 학술대회논문집 Vol.2016 No.5
최근 신재생에너지, 특히 해상풍력과 파력에 대한 수요와 관심이 급증하고 있으며 발전에 적합한 입지가 일치하는 해상풍력과 파력의 복합발전 시스템에 대한 연구 또한 진행되고 있다. 본 연구에서는 10MW급 부유식 파력-해상풍력 연계형 발전시스템의 설계기술 개발 연구 과제를 수행하며 진행된 해상 풍력 발전기의 하부 구조의 설계 방법 및 구조 강도 평가에 대한 내용을 다루고 있다. 해상풍력발전기는 복합발전 구조물의 column위에 배치되며 그 하부 구조는 다양한 하중 조건에 놓이게 된다. 따라서 선급의 rule requirement를 만족하는 구조물이라 하더라도 구조 강도 평가가 필요하며 결과에 따라 적절한 보강이 이루어 져야한다. 본 논문에서는 DNV offshore rule에 기반 한 풍력 발전기 하부 구조 설계의 과정과 유한 요소 해석을 통한 구조 강도 평가의 결과를 제시하여 향후 개발되는 부유식 복합발전 구조물의 설계 지침 마련에 기여하고자 한다. Recently, demands and interests for new renewable energy, especially offshore wind and wave energy have been increasing rapidly. As the site to generate electricity from offshore wind and wave accords well, researches on hybrid power system which utilizes both wave and offshore wind simultaneously is ongoing in many countries. In this research, design and strength assesment of substructure for offshore wind turbine is carried out as part of a R&D project for 10MW class floating wave-offshore wind hybrid power generation system. Offshore wind turbines are placed on column in hybrid power generation platform and its substructure is exposed to several loading conditions. Therefore, even if it is satisfied with a rule requirement of a classification society, structural analysis is required and substructure should be properly reinforced in accordance with the result. This study aims to contribute to set up design guidelines for floating hybrid power system by presenting design procedure of substructure for offshore wind turbine which is based on DNV offshore rules and strength assessment by finite element method.
손진식,양정석,이선재,장진구,임재한,김동하,Sohn, Jinsik,Yang, Jeongseok,Lee, Sunjae,Jang, Jinkoo,Lim, Jaehan,Kim, Dongha 대한상하수도학회 2008 상하수도학회지 Vol.22 No.3
A population growth and industry advances are increasing the demand for water while improving the quality of life. By turning seawater into freshwater it is an alternative for the water shortage problem. The study analyzes the orders and makes suggestions on the outlook of an enterprise that can supply desalination plants both inside and outside the country. It compares the production capacity of enterprises in the desalination industry who deal with the thermal and RO methods. We compare 7 enterprises in the thermal method which includes Doosan Heavy Industries, and the top 10 enterprises in the RO method which includes General Electric Corp. Now that the markets in the Middle East have opened and markets in other regions are gradually growing, demand for water will grow especially in developing countries that are in the process of industrialization. Also, the market share of thermal method desalination has been falling, gradually, because too much energy is spent during the process. On the other hand, the market share of the RO method will rise from 37% in 2005 to 57% in 2015. Recently, the desalination market shows that changing from thermal method to RO method is the trend in the Middle East. Growth and demand in other regions are growing at the same pace as the Middle East. Due to this trend, if the RO system, which is highly effective and uses less energy, were to be continuously developed it would be possible to supply water using sea water and would be a viable alternative water resource.