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지열시스템에서 직수급탕을 이용한 기계실 면적 축소와 시스템 성능 향상
강성재(Sung Jae Kang),임효재(Hyo Jae Lim),한지원(Ji Won Han),손병후(Byong Hu Sohn),최재호(Jae Ho Choi) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In order to use the geothermal heat pump system for hot water supply, it is necessary to have a large-scale hot water tank to store the maximum amount of water at a certain temperature. In this study, to compensate the disadvantages of the hot water system, the system was designed by minimizing the capacity of the hot water tank and indirectly exchanging the heat source and the tap water. The performance was experimentally evaluated. As a result of reducing the area of the hot water system using geothermal heat, the area-saving of the hot water system compared to the general hot water system was 41.9% for 50RT and 43.2% for 150RT. In the case of hot water supply temperature, the direct hot water geothermal system showed an average temperature change of less than 3.37℃. As a result of comparison of the COP of the hot heat pump, the direct hot water geothermal system is more efficient than the general hot water geothermal system by about 7.1%.
하반신 마비환자를 위한 동력보행보조기의 퍼지제어 기법 개발
강성재(Sung Jae Kang),류제청(Jei Cheong Ryu),김규석(Gyu Suk Kim),김영호(Young Ho Kim),문무성(Mu Seong Mun) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.2
In this study, we wolud be developed the fuzzy controlled PGO that controlled the flexion and the extension of each PGO’S hip joint using the bio-signal and FSR sensor. The PGO driving system is to couple the right and left sides of the orthosis by specially designed hip joints and pelvic section. This driving system consists of the orthosis, sensor, control system. An air supply system of muscle is composed of an air compressor, 2-way solenoid valve (MAC, USA), accumulator, pressure sensor. Role of this system provide air muscle with the compressed air at hip joint constantly. According to output signal of EMG sensor and foot sensor, air muscles and assists the flexion of hip joint during PGO gait. As a results, the maximum hip flexion angles of RGO’s gait and PGO’s gait were about 16° and 57° respectively. The maximum angle of flexion/extention in hip joint of the patients during RGO’s gait are smaller than normal gait, because of the step length of them shoes a little bit. But maximum angle of flexion/extention in hip joint of the patients during PGO’s gait are larger than normal gait.