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ISO 2631-1을 이용한 국내 고속철도차량의 인체진동 노출량 평가
김지만(Ji Man Kim),박진한(Jin Han Park),안세진(Se Jin Ahn),정의봉(Weui Bong Jeong) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.4
Vibration exposure of domestic high speed trains(KTX and ITX-saemaeulho) to passenger traveling on the Gyung-Bu line was measured to evaluate health effect which is based on ISO 2631-1. The vibration exposure was compared with the frequency weighted root mean square(r.m.s.) and vibration dose value(VDV) of the two trains’ vibration. It is concluded that vibration exposure of the two train during round trip of Busan-Seoul in single day is evaluated to be safe for the passenger’s health according to the health guidance caution defined on ISO 2631-1. Futhermore KTX’s vibration exposure is found to be significantly lower than ITX-saemaeulho thanks to lower vibration magnitude as well as shorter trip time.
LED 응용을 위한 BCM 방식의 Power Factor Correction Control IC 설계
김지만(Kim, Ji-Man),정진우(Jung, Jin-Woo),송한정(Song, Han-Jung) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.6
본 논문에서는 400V, 120W 급 LED 구동을 위한 1단 전류 경계모드(Boundary Condition Mode) 제어방식의 역률 개선 제어회로를 설계하였다. 제안하는 제어회로는 역률 개선 및 고조파 발생을 감소시키는 기능을 가지고 있으 며, 또한 PFC(Power Factor Correction)회로 내에서 상대적으로 많은 면적을 차지하는 기존의 바이폴라 트랜지스터 구 조 대신 새로운 CMOS 회로로 설계하였다. 기존대비, 약 30% 정도의 레이아웃 면적을 줄이게 되었고, 상용화 시 칩 의 가격 경쟁력이 클 것으로 사료된다. In this paper, a power factor correction (PFC) control circuit using single stage boundary conduction mode(BCM) for the 400V. 120W LED drive application has been designed. The proposed control circuit is aimed for improvement of the power factor correction and reduction of the total harmonic distortion. In this circuit, a new CMOS multiplier structure is used instead of a conventional BJT(bipolar junction transistor) based multiplier where has a relatively large area. The CMOS multiplier can bring 30 % reduced chip area, competitive die cost in comparison with the conventional BJT multiplier.
김지만(Ji Man Kim),정병규(Byung Kyoo Jung),허소정(So Jung Heo),안세진(Se Jin Ahn),정의봉(Weui Bong Jeong) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.8
The procedure to estimate the sources of noise and vibrations in a typical drum-type washing machine was presented. The sources should be identified to predict the radiated noise with computational model of structure. Source identification techniques based on singular decomposition were implemented using the measured signals of accelerometers and microphones. The finite element analysis and indirect boundary element analysis were implemented to predict the structural vibrations and the acoustic pressures at the field points. The predicted results by only structural sources were compared with those by both structural and acoustical sources. It was verified that not only the structural-borne source but also air-borne source should be considered to predict the radiated noise with better accuracy. The contribution analysis with respect to the transfer path was also preformed.
고온 고압 스팀을 주입하는 SAGD 공정에서 FeO<sub>X</sub> 무기첨가제가 오일샌드 회수율에 미치는 영향
송병진,유난숙,김지만,이철위,Song, Byung Jin,You, Nansuk,Kim, Ji Man,Lee, Chul Wee 한국공업화학회 2014 공업화학 Vol.25 No.1
박층의 오일샌드에서 비투멘 성분 회수를 위한 steam assisted gravity drainage 공정에서 무기첨가제 도입에 따른 오일 회수율 특성을 평가하고자 실험실 규모의 모사장치를 이용하여 모사된 오일샌드에서 오일성분을 회수하는 실험을 수행하였다. 오일샌드 모사를 위해 비투멘과 성질이 유사한 초중질유와 직경 1.5 mm의 글래스비드를 사용하였다. 무기합성법을 통해 $FeO_X$를 제조하여 무기첨가제로 도입하였다. 그 결과 시간에 따른 스팀의 열전달 속도는 무기첨가제 도입에 따라 약 40% 증가하였으며, 회수율 또한 약 30% 증가하였다. Lab scale simulated steam assisted gravity drainage (SAGD) process devices were used to investigate the effect of inorganic additives for the bitumen recovery from oil sand. An extra heavy oil similar with bitumen and 1.5 mm diameter of the glass bead instead of clay was mixed to simulate the oil sand. In addition, $FeO_X$ synthesized from the inorganic process was introduced as an inorganic additive for improving the recovery. Finally, the steam heat transfer rate of approximately 40% following the introduction of inorganic additives which also increased the recovery rate by about 30%.