플라즈마 이온주입기에서의 시변환 쉬스 연구

김곤호,김건우,김영우,최영도,김종식,김상진,한승희,홍문표 漢陽大學校 工學技術硏究所 1998 工學技術論文集 Vol.7 No.1

Abstract- In a plasma source ion implantation, the target is successively biased by negative voltage pulses with an intrinsic finite rise time, resulting in the time-dependent sheath formation around the target. Measurement of time-dependent sheath during the pulse rise show the ion matrix sheath development which is in proportion to square root of time and pulse rise rate over plasma density but independent of the ion mass.

AISI D2강 위에 다층으로 증착된 WC-Ti_(1-X)Al_(X)N 코팅의 국부부식 거동에 관한 연구

안승호,이정호,김호건,김정구,한전건 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9

Multilayered WC-Ti_(1-x)Al_(x)N coatings are characterized by periodically repeated structures of lamellae of WC-Ti/WC-Ti_(1-x)Al_(x)N. WC-Ti_(1-x)Al_(x)N coatings of changing Al concentration were deposited on AISI D2 steel by high-ionization sputtered plasma vapor deposition (PVD). The Al concentration could be controlled by using evaporation source for Al and fixing the evaporating rate of other metals. Four kinds of WC-Ti_(1-x)Al_(x)N coatings were prepared: WC-Ti_(0.6)Al_(0.4)N, WC-Ti_(0.53)Al_(0.47)N, WC-Ti_(0.5)Al_(0.5)N and WC-Ti_(0.43)Al_(0.57)N. The corrosion behavior of WC-Ti_(1-x)Al_(x)N coatings was investigated using electrochemical techniques in deaerated 3.5% NaCl electrolyte (galvanic corrosion test, potentiodynamic polarization test, electrochemical impedance spectroscopy and Mott-Schottky method) and surface analyses (GDOES, SEM and EDS). Particular attention was paid to the effect of growth defects on the coating properties related to the corrosion behavior. The results of the coating and substrate galvanic corrosion test showed low galvanic current densities. In the potentiodynamic polarization test and EIS measurement, the corrosion current density of WC-Ti_(0.5)Al_(0.5)N was lower than others and presented higher R_(ct) values than others after 240 h immersion time. This could be attributed to the formation of a Ti oxide, which promotes partial closing of the defects. Capacitance values obtained from EIS as a function of different potentials (C^(-2) vs E) showed that the oxide layer exhibited an n-type semiconductor behavior.

Reports : Structure-activity relationships of the intramolecular disulfide bonds in coprisin, a defensin from the dung beetle

( Jae Ho Lee ),( Da Eun Lee ),( Hye Min Choi ),( Ha Hyung Kim3 ),( Ho Kim ),( Jae Sam Hwang ),( Dong Gun Lee ),( Jae Il Kim ) 생화학분자생물학회(구 한국생화학분자생물학회) 2014 BMB Reports Vol.47 No.11

Defensins, which are small cationic molecules produced by organisms as part of their innate immune response, share a common structural scaffold that is stabilized by three disulfide bridges. Coprisin is a 43-amino acid defensin-like peptide from Copris tripartitus. Here, we report the intramolecular disulfide connectivity of cysteine-rich coprisin, and show that it is the same as in other insect defensins. The disulfide bond pairings of coprisin were determined by combining the enzymatic cleavage and mass analysis. We found that the loss of any single disulfide bond in coprisin eliminated all antibacterial, but not antifungal, activity. Circular dichroism (CD) analysis showed that two disulfide bonds, Cys20-Cys39 and Cys24- Cys41, stabilize coprisin’s α-helical region. Moreover, a BLAST search against UniProtKB database revealed that coprisin’s α-helical region is highly homologous to those of other insect defensins. [BMB Reports 2014; 47(11): 625-630]

조혈모세포이식 후 발생한 주폐포자층 폐렴에 대한 고찰

주지현,최정현,이동건,백지연,고윤호,이혜정,김세희,신호진,박윤희,박지영,김유진,신완식,김춘추 대한감염학회 2001 감염 Vol.33 No.4

Background : Pneumocytitis cainii pneumonia (PCP) can occur in immunocompromised hosts especially such as AIDS or cancer patients. Although recent research had focused on PCP in AIDS patients, few studies have described the clinical presentations of PCP in recipients of stem cell transplantation (SCT). We evaluated the clinical manifestations of PCP in SCT patients admitted at St. Mary's hospital, Seoul, Korea. Methods : The medical records of 17 PCP patients undergoing SCT between Feb. 1998 and Feb. 2000 were reviewed. The diagnosis of PCP was confirmed through the demonstration of Pneumocytitis cainii via either cytology of brochoalveolar lavage (BAL) or histological technique of lung biopsy. CMV disease and CMV infection were confirmed by BAL culture and antigenemia respectively . Results : Seventeen patients were all recipients of allogeneic SCT and 7 of 17 patients were performed non-sibling SCT. Patients presented with symptoms including brief period (4 ∼23 days) of fever (76%), dyspnea (70%), cough (64%), and signs such as rare(58.8%), Sixteen patients (94%) had been receiving immunosuppressive agent such as cyclosporine A (64%) or Fk506 (35%) without PCP prophylaxis. Eleven patients (64%) were treated with corticosteroid with mean dose of 16 mg/day prednisolone and mean duration of 4.6 months after post-SCT period. Twelve patients were co-infected with CMV. Another co-infected miCroorganisms were Pseudomonas aeruginosa, Mycobacterium tuberculosis, herpes simplex virus, parainfluenza virus, Average duration of treatment with trimethoprim-sulfamethoxazole (TMP/SMX) was 21 ±9 days. Four patients died, and three of them were related with PCP. Conclusion : PCP developed frequently in patients who were taking immunosuppressive drug due to graft versus host disease or were not taking TMP/SMX prophylaxis. High risk patients showing fever, cough, or dyspnea should be considered to take early bronchoscopic intervention for detection of PCP. When treat for PCP, it also be considered to the possibility of coinfection such as CMV. (Korean J Infect Dis 33:273∼279, 2001)

한양대학교 (안산 캠퍼스) 주변 담수호의 수질분석

김용건,원호식,경진범,김동국,홍태기 漢陽大學校 環境科學硏究所 2000 環境科學論文集 Vol.21 No.-

본 연구의 목적은 한양대학교(안산캠퍼스) 주변 호수들의 수질과 물의 오염 상태를 조사하기 위해서이다. 수질은 물의 온도, pH 화학적 산소 요구량(CODMn), 총 질소(T-N), 총 인(T-P), 부유물질(SS), 그리고 중금속(Zn, Cd, Pb, Cu, As, Cr(VI), Hg)을 측정했다. 호수들의 수질등급은 환경처에 의해 평가된 등급V보다 더 낮았다. 한양대학교(안산캠퍼스) 주변의 모든 저수지들은 생활폐수, 그리고 산업폐수의 유입으로 이미 심각하게 오염되어 있다. 그러나 중금속의 오염은 관찰되지 않았다. 만약 폐수의 처리가 확립되지 않는다면 한양대학교 주변 저수지들의 수질은 더욱악화될것으로 사료된다. The objective of this study was to investigate the water quality and status of water pollution in the lakes around Hanyang University (Ansan campus). Water quality was determined by monitoring water temperature, pH, chemical oxygen demand(CODMn), total nitrogen (T-N), total Phosphorus (T-P), suspended solids (SS), heavy metals (Zn, Cd, Pb, Cu, As, Cr(VI) and Hg). The level of water quality of lakes was lower than the level V estimated by the Enviroment Ministry. All of the reserviors around Hanyang University (Ansan campus) had been already seriously polluted by inflow of wastewater from residents, animal husbandries and industries. However, heavy metal pollution was not observed. It is recommended to establish plans for water quality improvement for the reserviors around Hanyang University before it gets worse.

활성탄 및 자외선에 의한 세균제거에 관한 연구

김경진,김형석,이호근 慶熙大學校 地球環境硏究所 1998 지구환경논문집 Vol.9 No.-

The environment of the earth has been changed worse by human activities. There are lots of waterborne diseases which are caused by bacteria, virus, and protozoan. Microorganisms pose a serious threat to the safety of the world's drinking water. At least 25 millon people in the world die because of the waterborne diseases. The major symptoms are diarriah, vomite, stomach pain, and headache. Some diseases kill patients who are especially immuno compromised such as cholera, typhoid, etc. Many cases of this kind of diseases are the important issue throughout the world. Therefore international academic conferences are holding frequently. One of the recommentation was announced in Guayaquil, Ecuador in 1995, which is related with control of waterborne diseases. We know that water pollution by E.coli indicate fecal contamination in water system. We are drinking about 2 liters of drinking water every day. There are several kinds of drinkind water, e.g., tap water, bottled water, purifier passed water, groundwater, etc. The city tap water is most widely using drinking water source. But owing to the corrosion of water supplying pipe lines and storage tank contamination in buildings, the tap water quality has some problems of bacteria and other contaminants. Throughout the world, water purifiers are using in many countries, but there are few reports on bacteria behavior in water purifiers. Authors studied the bacteria reduction and removal effects through activated carbon and UV lamp in water purifier, and got some interesting results.

平面硏削에 있어서 表面거칠기에 關한 硏究 : 硏削숫돌粒子의 粒度 및 硏削깊이를 中心으로

金健鎬 군산대학교 1986 群山水産專門大學 硏究報告 Vol.20 No.3

In order to improve the finished surface roughness and the precision size in the workpiece, it is the most important problem to study the standard of the optimum choice of grinding wheel and the grinding condition. This paper is discussed on the influence of the grinding depth and the grain size of grinding wheel to affect on the surface roughness in the surface grinding. The results obtained in these experiments are as follows. 1. In order to gain the smooth finished surface of the workpiece, it is advisable to choose the large mesh of the grain size 60∼100 mesh in the grinding wheel. 2. It is advisable to choose the small grinding depth in the range of the grinding depth 5∼20μm.

Drilling條件에 있어서 Burr의 生成에 對한 硏究 : Drilling Thrust와 Drilling Machine의 Spindle Speed關係를 中心으로

金健鎬 군산대학교 1981 群山水産專門大學 硏究報告 Vol.15 No.3

In a drilling, a burr is always produced on the outlet lowest end of the hole. An important thing in a drilling condition are drilling thrust and spindle speed of drill machine. In this study, the relation between those has obtained by experimentation. The results of the study are as follows. 1) The increaser a spindle speed of drill machine is, the larger height of burr is, and thickness of burr is constant. 2) The increaser a drilling thrust is, the larger thickness of burr is, and height of burr is nonconstant. So height and thickness of burr effect to the minuteness of workpiece. In order for minimization of burr size, drill thrust and spindle speed are good to be reduced those, if possible, on the operation of drilling machine.

旋削條件이 切削抵抗과 表面거칠기에 미치는 影響에 關한 硏究

金健鎬 군산대학교 1983 群山水産專門大學 硏究報告 Vol.17 No.3

This paper proposed a study that improve the cutting effects in the turning condition. The results that we studied the references and performed the experiments are following as: 1.The cutting resistance increased according to rise of the feed and the cutting depth, and it almost changed into a vertical component. 2.By reducing the feed and rising the cutting depth, the specific cutting resistance decreased. 3.The surface roughness increased according to the rising feed, but none concerned in the cutting depth. 4.In cutting speed 70-130 m/min, the little cutting resistance and the surface roughness increased according to the cutting speed rised. When we cut the same cutting area in the cutting speed 70-130 m/min, it had better work under the condition of the reducing feed, the rising of the cutting depth and the cutting speed.

뽕잎분말 첨가비율에 따른 쌀다식의 관능평가 및 영양성분 함량변화에 관한 연구

김애정,이건순,여정숙,김영호 혜전대학 식품산업연구소 2002 식품산업연구지 Vol.3 No.-

This study was carried out in order to investigate the study on the change of nutrient contents and sensory evaluation in rice Dasik according to the added level of mulberry leaf powder. The results are summarised as follows; 1. According to sensory evaluation, rice Dasik added mulberry leaf powder 2% showed higher level of appearance, color, flavor than other group. 2. With increasing mulberry leaf powder, crude protein, moisture and crude ash contents were significantly increased. The contents of crude fat was decreased with increasing mulberry leaf powder. 3. Ca, P, K and Mg contents of mulberry leaf powder 1%, 2%, 3%, 4% was higher than mulberry leaf powder free group.