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R-600a 및 R-134a를 공용으로 사용한 소형 냉동사이클의 성능 특성 최적화에 대한 실험적 연구
장의성(Euisung Jang),윤원재(Wonjae Yoon),정현준(Hyunjoon Chung),정해원(Chung Haewon Jung),김용찬(Yongchan Kim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Because of using both R-134a and R-600a as a refrigerant for a household refrigerator in the global market, the home-appliance industry needs an optimized cycle for a household refrigerator using both refrigerants. The objective of this study is to provide the design guideline on the optimization of a refrigeration system. Performance characteristics of the refrigeration system were tested by varying the refrigerant charge and the capillary tube length The tested refrigeration system were optimized at the refrigerant charge of 60 g and the capillary tube length of 3600 ㎜, with R-134a and the refrigerant charge of 34 g and the capillary tube length of 3900 ㎜, with R-600a.
R-600a 및 R-134a를 공용으로 사용한 소형 냉동사이클의 성능 특성 최적화에 대한 실험적 연구
장의성(Euisung Jang),윤원재(Wonjae Yoon),정현준(Hyunjoon Chung),정해원(Haewon Jung),김용찬(Yongchan Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.5
Because both R-134a and R-600a are used as a refrigerant of a household refrigerator in the global market, the home-appliance industry needs an optimized cycle for both refrigerants. The objective of this study is to provide the design guideline on the optimization of a refrigeration system using both refrigerants. For both refrigerants, the performance characteristics of the refrigeration system were tested by varying refrigerant charge amount, capillary tube length, suction diameter and SLHX length. The tested refrigeration system was optimized at the refrigerant charge of 60 g and the capillary tube length of 3600 ㎜ with R-134a, and the refrigerant charge of 34 g and the capillary tube length of 3900 ㎜ with R-600a. The COP increased from 1.63 to 1.68 for R-134a and increased from 1.37 to 1.48 for R-600a, respectively, by applying the suction diameter expansion. In addition, the COP of the R-134a and R-600a system decreased by 2.3∼2.4% as the SLHX length decreased by 300 ㎜.
Small Electrical Nerve Stimulator by Arm Processor
Sanghyo Woo,Changwook Kim,Mohyuddin Zia,Sangheon Lee,Euisung Chung,Jangwoo Lee,Junghyun Lee,Heejoon Park,Chulho Won,Jinho Cho 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Recently, performance of a mobile phone has increased dramatically, and it is possible to integrate various biotechnologies into the mobile phone. Among the various biotechnologies, a transcutaneous electrical nerve stimulator has many advantages such as improve the circulation of blood and suppress a pain. To integrate the stimulator in the mobile phone, it is necessity to make small, low power, and safe module. In this paper, the transcutaneous electrical nerve stimulation module was designed and implemented by small boost converter. To reduce the power consumption, the external ADC was used to measure the value of the charged energy. Also, the module limits the maximum transmit power by tank capacitor value to inprove safety. To confirm the operation of designed module, an arm processor was used to control the module. The implemented module consumes only 6.6 ㎽ (without CPU) at normal stimulus mode.
Polysomnography by ECG Telemetry System
Mohy-Ud-Din Zia,Woo Sanghyo,Changwook Kim,Junghyun Lee,Jangwoo Lee,Heejoon Park,Chulho Won,Euisung Chung,J. H. Cho 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Recently, the biotelemetry is become more and more popular and people and trying to get the maximum beneficent from it. In this regard we developed real ECG telemetry system have extremely low power consumption and the dimensions are 2.5 ㎝ by 3 ㎝. In this circuit ECG amplifier and transmitter are embedded on the single side PCB. This paper explain the method to use the 2-lead ECG signal in the recording of the dream time of a normal person by detecting the REM sleep time through the heart rate variability in sleep cycle to make the sleep studies easier and also a person can record his dream time in the home. In this way we are able to use the biotelemetry in the recording of the dream time remotely. This method is much easier than the conventional method of Polysomnography.