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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.
( 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]
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.
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)
미셀을 이용한 한외여과에서 카드뮴(Cd), 납(Pb) 이온의 제거에 대한 교반시간의 영향
김승건,이호원,강영주 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2
The objective of this paper is to investigate the effect of mixing time on removal of Cd and Pb in micellar enhanced ultrafiltration with DCA(deoxycholic acid). Permeate flux, rejection ratio of DCA, and removal efficiency of Cd and Pb were gradually increased with increase of mixing times, they had almost reached equilibrium after 1hr of mixing. The rejection ratios of DCA in Cd and Pb solution were 91.6% and 93.8%, respectively. The removal efficiencies of Cd and Pb were 99.7% and 99.9%, respectively.
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.
단조강(SF45A)재의 표면피로크랙 성장 거동에 관한 고찰
金健鎬,정재강,최종로,방웅주 군산대학교 1993 群山水産專門大學 硏究報告 Vol.28 No.1
Fatigue life prediction of fatigue fracture is very important problem. This paper is observed on the surface small crack growth behaviour of smooth specimen. This results were as follows. Surface small crack are created small crack of high density in about 50% of fatigue life, retarded crack growth due to crack coalescence in about 60% and 85%, and when distributed small cracks are growing, it was growthed few large cracks. On the other hand, To analyze crack growth rate used stress intensity factor was difficult due to existed small crack stegnant range.
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.
생체모사환경에서 DLC 필름의 부식마모 특성에 미치는 Si 함량의 영향에 관한 연구
김호건,김우중,김정구,박세준,이광렬 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.3
In a method to improve resistance to wear, corrosion and mechanical properties of protective coating, DLC coatings have been extensively studied over the past several years due to their unique combination of properties. Especially, Si-DLC coatings have been attracting increasing interest of researchers since they have a great potential for solving some of the major disadvantages of pure DLC coatings. Si-incorporated diamond-like carbon (Si-DLC) coatings ranging from 0 to 2 at.% were deposited on Ti alloy substrate by means of r.f. plasma-assisted chemical vapor deposition (r.f. PACVD) technique, using mixtures of benzene (C_(6)H_(6)) and silane (SiH_(4)) as the reaction gases. Corrosion and wear behavior of DLC coatings was investigated by electrochemical techniques (potentiodynamic polarization test and electrochemical impedance spectroscopy), tribological techchnique(wear test) and surface analyses (atomic force microscopy, scanning electron microscopy and Raman spectroscopy). It was found that DLC coatings with increasing Si content could acquire improved corrosion and wear resistance in the simulated body fluid environment (0.89 wt.% NaCl of pH 7.4 at 37℃). (Received December 6, 2004)
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.