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이어폰 및 헤드폰의 정자기장이 인공심장 박동기 및 이식형 제세동기에 미치는 영향
정재원,최수범,박지수,김덕원,Chung, J.W.,Choi, S.B.,Park, J.S.,Kim, D.W. 대한의용생체공학회 2015 의공학회지 Vol.36 No.1
In this study, we evaluated the effects of static magnetic fields of earphones and headphones on pacemakers and implantable cardioverter defibrillators(ICDs). Five pacemakers and three ICDs were subjected to in-vitro test with three headphones which were an in-ear earphone, clip-on headphone, and closed-back headphone. Each implantable device was placed in close proximity(within 3 mm) to the ear-pad of each of the earphone and headphones for 3 min. As a result, no effects were observed on the pacemakers for the earphone and headphones during the test, but an effect was observed on one ICD for the clip-on and closed-back headphone during the test. When the ICD was placed in close proximity to the headphones, the ICD temporarily suspended functions of tachyarrhythmia detection and therapy. The effect was not observed in this study when the headphones were at least 2 cm from the ICD. Based on these findings, patients with ICDs should be advised to keep earphones and headphones at least 2 cm apart from their ICDs.
다채널 편평관의 응축 열전달 및 압력강하특성에 관한 실험
전창덕,정재원,이진호,Jeon, C.D.,Chung, J.W.,Lee, J.H. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3
In this study, an experiment was performed to investigate the characteristics of pressure drop and heat transfer of multi-channel tubes for automotive condenser using HFC-134a as an alternative refrigerant. The mass flux and inlet saturation pressure of the refrigerant were controlled, respectively, in the range of 200 to $500kg/m^2s$ and 1.0 to 1.6MPa. Pressure drop and heat transfer coefficient were compared with the previously proposed correlations and new correlations based on Traviss' correlation were suggested. Prediction of pressure drop and heat transfer coefficient based on the new correlations agrees with experimental results within ${\pm}9%$ and -18~+11%, respectively.
30wt%Ag-36wt%Cu-32wt%Zn-2wt%Sn 브레이징 합금의 미세조직과 기계적 물성에 미치는 Ni 첨가의 영향
정재원,이상율,양성철 한국 항공대학교 항공산업기술연구소 2000 航空宇宙産業技術硏究所 硏究誌 Vol.10 No.-
본 연구의 목적은 Cd-free합금의 개발로, Ag-Cu-Zn-Sn기 브레이징 합금에 Ni을 첨가함에 따라 브레이징 합금에 조직적인 변화가 나타났다. Ag-Cu-Zn 기 브레이징 합금에 Cd 대신에 Ni첨가의 효과와 접합된 접합부의 미세조직은 EDS가 장착된 SEM과 XRD, DSC 등을 사용하여 분석하였다. Ni이 1∼2wt% 첨가된 브레이징 합금에서 Ni 함량의 증가에 따라 미소경도와 인장강도가 증가하였고, 가장 높은 인장강도는 Ni이 2wt% 첨가된 3076-2 합금으로 약 820 MPa 이었다. 브레이징은 850℃에서 15분간 대기중에서 노 브레이징 방법을 사용하여 실시하였고, 접합강도는 파괴 전단하중에 의해 측정하였다. 가장 높은 전단강도는 Ni이 2wt%첨가된 3076-2 합금에서 얻었으며, 258 MPa 이었다. The purpose of this study is to develope a Cd-free brazing filler metal. The microstructure of Ag-Cu-Zn-Sn based brazing alloy was affected by Ni addition. Effects of Ni addition replacing Cd in Ag-Cu-Zn based brazing alloy and microscope(SEM) equipped with energy-dispersive spectrometer(EDS). X-ray diffractometer(XRD) and differential scanning calorimetry(DSC). As Ni is added 1~2wt% in the brazing alloy, microhardness and tensile strength of brazing alloy increase with Ni contents. the maximum average tensile strength of 820 MPa has been obtained from the 3076-2 alloy which were added 2wt% Ni. Brazing is performed on the STS304/STS304 by furnace-brazing at 850℃ for 15min. Joint shear strength was determined by fracture shear loading and the brazed with 3076-2 alloy(2wt% Ni added) showed the highest shear strength of about 258 MPa.