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충돌분류계에서 WIRE MESH를 이용한 열전달 증진에 관한 연구
금성민(S.M.Kum),김동춘(D.C.Kim),유지오(J.O.Yoo),이창언(C.E.Lee),임장순(C.S.Yim) 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.1
본 연구는 2차원 충돌공기분류계의 포텐셜코어 영역에서 열전달증진을 목적으로 노즐출구와 전열면사이에 메쉬를 설치한후 노즐출구 속도, 메쉬와 전열면사이의 간극, 노즐출구와 전열면사이의 거리를 변화시킬 때의 열전달특성을 메쉬를 설치하지 않은 경우와 비교 검토한 것으로 메쉬를 설치했을 때에는 분류가 전열면에 충돌하면서 소분류로 분할되어 발생하는 난류에 의해 충돌영역에서 열전달성능이 좋아지며, 또한 벽면분류영역으로 진행하면서 홀과 홀사이의 밑부분에서 일나는 가속으로 인해 열전달성능이 향상된다. 특히 메쉬와 전열면사이의 간극을 변화시켰을 경우 정체점부근에서는 간극이 클수록, 벽면분류영역에서는 간극이 작을수록 전달성능은 향상되며 U=18m/s, H/B=s, C=1인 경우에는 메쉬를 설치하지 않은 평판보다 평균 약 44%의 열전달증진 효과과 있었다. 그리고 본 실험결과를 기존의 난류촉진체를 이용한 연구결과와도 비교 검토하였다. The objective of this research was to investigate the enhancement of heat transfer by wire mesh in impinging air jet system at the potential core region.<br/> The first experiment was carried out without mesh between nozzle exit and flat plate and the second experiment was done with mesh between them.<br/> When mesh was installed in front of the plate, heat transfer has been increased due to the acceleration between rectangular halls and divided small jet<br/> In case clearances are changed, heat transfer comes to maximum under the condition of C= 1mm, irrespective of nozzle exit velocity and H/B.<br/> Also the average heat transfer enhancement rate of a flat plate with mesh has been increased about 44% at maximum under the condition of U=18m/s, H/B=2 and C=l mm, compared to the result of a flat plate without mesh.
무기태 질소와 액상구비의 시용수준이 o rcha rdg rass의 건물수량에 미치는 영향
이주삼(J. S. Lee),임상곤(S. G. Yim),정재춘(J. C. Chung) 유기성자원학회 1993 유기물자원화 Vol.1 No.2
무기태 질소와 액상구비의 사용수준이 예취빈도를 달리한 Orchardgrass 초지의 건물수량에 미치는 영향을 조사한 바 사용수준과 예취번초간에서는 0.1% 수준, 사용빈도와 예취번초간의 교호작용에 있어서는 5 % 수준의 유의성이 인정되었다. 일반적으로 3회 예취구보다 4회 예취구에서 건물수량이 증가하였다. 무기태 질소의 경우는 사용수준 (90-270 kg/ha) 에 따른 건물수량에 있어서는 유의한 차이가 인정되지 않았다. 액상구비의 시용효과는 3회 예취구에서 사용수준 평균 91. 4% (72.2-109.7% 의 범위). 4회 예취구에서는 75.1% (48.3-107.9% 의 범위)를 나타내었다. 연간 3-4회 예취하는 채초지에서는 액상구비의 적정 시용량은 80-90 m3/ha (240-270 N kg/ha) 의 수준으로 추정되었고 이때 건물수량은 9.55-1 1. 22 ton/ha 이었다. This experiment was to study the effects of application rates of mineral N and cattle slurry on the dry matter yield of Orchardgrass grown in different cutting frequency. Annual rates of mineral N of O(No), 90kg(N 1), 180kg(N2) and 270kg/ha(N3) in 3 cuttings, and O(No), 120kg(N1), 240(N2) and 360kg/ha(N3) were applied as urea in 4 cuttmgs. Cattle slurry applied at rates of 30m3(SI), 60m3(S2) and 90m3/ha(S3), suppling 90kg, 180kg and 240kg N/ha in 3 cuttings, and at rates of 40m3(S t}, 80m’(S2) and 120m3/ha(S3), suppling 120kg, 240kg and 360kg N/ha in 4 cuttings, respectively. The resu1ts were summarized as follows ; 1. Mineral N and cattle slurry application rates(N), and cuts(C) were significant differences at the 0.1 % level(p < 0.001), and 5% level(p < 0.05) for the interaction of N x C in both cuttings. 2. The annual dry matter yields obtained were 8.8ton-l0. 1ton/ha at rates of N1-N3, and 7. 1ton-9.5ton/ha at rates of SI-S3 in 3 cuttings. The annual dry matter yields obtained were 10.9ton-13.9ton/ha at rates of N1-N3, and 6.9ton-l 1.2ton/ha at rates of SI-S3 in 4 cuttings, respectìvely. 3. Relative efficiency of cattle slurry N for the dry matter production of Orchardgrass pasture as compared to mineral N were 9 1.4%(ranged from 72.2% to 109.7%) in 3 cuttings, and 75.1 %(ranged from 48.3% to 107.9%) in 4 cuttings, respectively. 4. The annual cattle slurry application rates required to maintain highest dry matter yields were estimated to be 90m3/ha(270kg N/ha) and 80m3/ha(240kg N/kg) in 3 and 4 cuttings.
멀티채널 방식에 의한 초미세 바늘 전극의 제작 및 빔 특성
임연찬,현정우,김성수,박철우,이종항,강승언 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
An ultra-sharp tungsten electrode for field emission was manufactured by using an electrochemical etching method, and its beam characteristics were investigated. KOH and NaOH were the electrolytes used in this research, and the taper length of the tip varied form 150 μm to 250μm according to the applied voltage and the concentration of the electrolyte. The electron-beam stability was measured to be within 5% for a total emission current of 5 μA during 4 hours of operation, and the ignition voltages were found to be ~300 V. The tip radius was experimentally found to be 250A˚ from a linear fitting of Fowler-Nordheim plots, which was in remarkably good agreement with that of the image size from scanning ion-microscopy.
Yim, H,Shin, S-B,Woo, S U,Lee, P C-W,Erikson, R L The Author(s) 2017 Oncogene Vol.36 No.7
<P>Although 53BP1 has been established well as a mediator in DNA damage response, its function in mitosis is not clearly understood. We found that 53BP1 is a mitotic-binding partner of the kinases Plk1 and AuroraA, and that the binding with Plk1 increases the stability of 53BP1 by accelerating its interaction with the deubiquitinase USP7. Depletion of 53BP1 induces mitotic defects such as chromosomal missegregation, misorientation of spindle poles and the generation of extra centrosomes, which is similar phenotype to USP7-knockdown cells. In addition, 53BP1 depletion reduces the levels of p53 and centromere protein F ( CENPF), interacting proteins of 53BP1. These phenotypes induced by 53BP1 depletion were rescued by expression of wild-type or phosphomimic mutant 53BP1 but not by expression of a dephosphomimic mutant. We propose that phosphorylation of 53BP1 at S380 accelerates complex formation with USP7 and CENPF to regulate their stability, thus having a crucial role in proper centrosome positioning, chromosomal alignment, and centrosome number.</P>
Hong, S.,Yim, U.H.,Ha, S.Y.,Shim, W.J.,Jeon, S.,Lee, S.,Kim, C.,Choi, K.,Jung, J.,Giesy, J.P.,Khim, J.S. Pergamon Press 2016 CHEMOSPHERE - Vol.144 No.-
Bioaccessibility of toxic substances in sedimentary residual oil is a crucial factor that needs to be considered for accurate risk assessments posed by oil spills. However, information on oil weathering processes and bioaccessibility of residual oil is often not sufficient and clear. In the present study, bioaccessibility of aryl hydrocarbon receptor (AhR)-active polycyclic aromatic hydrocarbons (PAHs) in coastal sediments near the site of the Hebei Spirit oil spill (Korea, 2007) was assessed by Tenax extraction in effect-directed analysis (EDA). Sediment samples collected 6 years after the oil spill were extracted using Soxhlet or Tenax, and EDA was performed using a battery of H4IIE-luc bioassay and GC/MSD analysis. Concentrations of PAHs and alkyl-PAHs in Soxhlet extracts ranged from 210 to 53,000 μg kg<SUP>-1</SUP> dry mass. However, concentrations of PAHs and alkyl-PAHs in Tenax extracts were approximately 20-fold less compared to those in Soxhlet extracts. In Soxhlet and Tenax extracts, the major AhR-active PAHs were identified as C1-chrysene, C3-chrysene, and C4-phenanthrene. Concentrations of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) equivalents (TEQ<SUB>PAHs</SUB>) explained 31% and 60% of the bioassay-derived TCDD-EQ concentrations in Soxhlet and Tenax extracts, respectively. Overall, bioaccessibility of PAHs and alkyl-PAHs in sedimentary residual oils depended on hydrophobicity (log K<SUB>ow</SUB>) and degree of weathering of crude oil. The results of the present study provide further evidence in support of the biological and ecological recoveries of oil spill sites.