http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전기도금법으로 만든 니켈-티타니아 복합체에서 초음파 처리가 도금층에 미치는 영향 연구
김명진 ( Myong Jin Kim ),김정수 ( Joung Soo Kim ),김동진 ( Dong Jin Kim ),김홍표 ( Hong Pyo Kim ),황성식 ( Seong Sik Hwang ) 한국부식방식학회 2013 Corrosion Science and Technology Vol.12 No.4
In the present study, Ni-TiO2 composite coatings were electrodeposited in a sulfamate bath containing TiO2 particles. The influence of the ultrasonic treatment on the co-deposition of TiO2 particles in the coating and the hardness of the electrodeposited Ni-TiO2 composite has been investigated. Three different ultrasonic treatments (pretreatment before the electrodeposition (pre-UT), pretreatment + applied during the electrodeposition (UT), and the electrodeposition without the ultrasonic treatment (w/o UT)) were performed. The Ni-TiO2 composite coatings are characterized using scanning electron microscopy (SEM), image analyzer, and hardness tester. Comparison of results indicates that the volume fraction is more important factor than the agglomerated particle size in terms of the strength improvement, and the strength of the electrodeposited Ni-TiO2 composite coatings is enhanced with pre-UT condition.
김명진 ( Myong Jin Kim ),김정수 ( Joung Soo Kim ),김동진 ( Dong Jin Kim ),김홍표 ( Hong Pyo Kim ) 한국부식방식학회 2011 Corrosion Science and Technology Vol.10 No.5
In the present study, denting corrosion experiments were performed as a function of crevice gap size (50, 100 and 200 ㎛) in a solution containing 3,500 ppm NaCl+0.2 M CuCl2 (pH=3 adjusted by HCl). The effects of chloride ion concentrations (3, 3,500 and 35,000 ppm as NaCl) were also outlined with two different crevice gap sized (100, 200 ㎛). In addition, the effect of NiB on the denting corrosion was also investigated in a solution of 35,000 ppm NaCl+0.2 M CuCl2 (pH=3 adjusted by HCl). The results showed that denting rate increased with the increasing crevice gap size at an initial stage and became nearly constant afterwards. As the concentration of chloride ion increased, the denting rate also increased. However, However, the addition of a Nib powder of 4 g/L in to the acid-chloride solution was observed to suppress the denting rate significantly.
Alloy 600에 전기 도금한 Ni-P-Fe 및 Ni-P-B 층의 열적 안정성 연구
김명진(Myong Jin Kim),김정수(Joung Soo Kim),김동진(Dong Jin Kim),김홍표(Hong Pyo Kim) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.2
In this study, thermal stability of the mechanical properties of Ni-P-B and Ni-P-Fe layers electroplated on Alloy 600 material was evaluated by measuring their microhardness, tensile strength, and elongation after heat treatment at 325℃ and 400℃. According to the results, there was no noticeable change in microhardness of the two electrodeposits before and after heat treatment at the temperatures for 30 days. In the case of a Ni-P-B electrodeposit, ultimate tensile strength (UTS) slightly increases with heat treatment time, while its elongation decreases, showing good thermal stability in the mechanical properties at high temperature. On the other hand, UTS and elongation of Ni-P-Fe decrease with heat treatment time, which is very unusual observation. This result was attributed to the bad microstructure of Ni-P-Fe having many defects in the deposit formed early stage of an electroplating process and their redistribution to link to become large ones during heat treatment.
pH, duty cycle, 교반, 첨가제가 Ni-TiO₂ 전기도금 복합체의 TiO₂ 공석특성과 열적안정성에 미치는 영향 연구
김명진(Myong-Jin Kim),김정수(Joung Soo Kim),김동진(Dong-Jin Kim),김홍표(Hong Pyo Kim),황성식(Seong Sik Hwang) 한국표면공학회 2012 한국표면공학회지 Vol.45 No.3
The effects of pH, types of applied current, agitation method and time, additive on the amount of codeposited TiO₂ particles in the matrix were investigated. The deposition rates increased with increasing pH values, while the volume fraction of TiO₂ particles and the size of agglomerated TiO₂ particles in the composite decreased. The volume fraction of TiO₂ particles in the composite decreased when pulsed current of 50% duty cycle was used. And the size of agglomerated TiO₂ particles in the nickel matrix of pulsed current was smaller than that of DC current specimen. The volume fraction of TiO₂ particles in the matrix decreased with longer time by air agitation, but in case of using magnetic bar, volume fraction in the same range of time was relatively constant. The volume fraction of the electrodeposited Ni-TiO₂ composite in the solution containing 0.01 M Dimethylamine borane (DMAB) increased slightly with increasing agitation time regardless of agitation methods. Thermal stability of the electrodeposited Ni-TiO₂ composite increased with lower pH at the temperature range of 200~800℃, and the results showed that the amount of co-deposited TiO₂ relies more on the deposition rate than zetapotential of TiO₂ particles.
마그네타이트 (Fe3O4) 전극의 제조와 전기화학 특성
김명진 ( Myong Jin Kim ),김동진 ( Dong Jin Kim ),김홍표 ( Hong Pyo Kim ) 한국부식방식학회 2015 Corrosion Science and Technology Vol.14 No.1
Flow Accelerated Corrosion (FAC) causes unexpected accidents in a secondary side of a nuclear power plant. The secondary side pipes are mainly carbon steel tubes that have a protective magnetite (Fe3O4) layer on the inner surface. The stability of the protective magnetite layer depends on the parameters related to the FAC phenomena such as pH, temperature, flow rate, surface roughness etc. The dissolution of magnetite is basically the electrochemical reaction, but the most of the experiments of magnetite dissolution were carried out thermodynamically to determine the solubility of magnetite. The knowledge of the electrochemical properties of magnetite is required to understand the dissolution process of magnetite. This paper reviews the manufacture of the magnetite (Fe3O4) electrode, and summaries the electrochemical properties of the magnetite.
간세포암종 진단에 유의한 PIVKA-II 값의 제시- ROC Curve를 이용하여 -(논평참조)
김명진 ( Myong Jin Kim ),배강우 ( Kang Woo Bae ),서평주 ( Pyoung Ju Seo ),정인국 ( In Kook Jeong ),김정혁 ( Jung Hyuk Kim ),이보한 ( Bo Han Lee ),방기태 ( Ki Tae Bang ),김동우 ( Dong Woo Kim ),송일한 ( Il Han Song ) 대한간학회 2006 Clinical and Molecular Hepatology(대한간학회지) Vol.12 No.3
김명진(Myong Jin Kim),김규식(Kyoo Sik Kim) 대한구강악안면외과학회 1979 대한구강악안면외과학회지 Vol.5 No.1
5 different suture materials were tested in the oral cavity of 27 patients and 24 rabbits to determine the degree of handling characteristics and the tissue reactions. Tissue reactions were graded clinically at 1, 3, 5 and 7days after : suturing in patients and histologically 1, 3, 5, 7, 14 and 21days after suturing in rabbits. The results were as follows; 1. On the pliability and the knot security, the polyfilament suture materials (Silk, Nylon II, P.G.A.) were better than the monofilament suture materials (Catgut, Nylon I), but in case of P.G.A., a loose first knot couldn t be tightened by pulling hard on the second, and occasionally came untied. 2. The monofilament suture materials evaluted (Catgut, Nylon I) resulted in a milder tissue response than the polyfilament suture materials, otherwise, the polyfilament P.G.A. suture showed the finding of favorable mild reaction. 3. In the polyfilament suture materials (Silk, Nylon II, P.G.A.), the Wicking Action was observed which could result in the transmission of a various number of oral flora to the depth of the wounds. 4. Oral epithelium proliferated along the course of the suture tracts, tending to isolate and exteriorize the source of inflammation, and to create a fistulous tract, this was observed at 5days 5. Chromic Catgut and P.G.A. sutures are absorbable, but remains longer than desired in the oral cavity, so they can be used in the same manner as nonabsorbable suture materials.
김명진 ( Myong Jin Kim ),이보한 ( Bo Han Lee ),김성규 ( Seong Kyu Kim ),이두선 ( Du Sun Lee ),명나혜 ( Na Hye Myong ),장현규 ( Hyun Kyu Chang ) 대한류마티스학회 2005 대한류마티스학회지 Vol.12 No.4
Polyarteritis nodosa (PAN) is a systemic necrotizing vasculitis of small and medium-sized muscular arteries that typically involve multiple organs, including peripheral nerve, skin, joint, muscle, gastrointestinal tract, kidney, and heart. In addition to systemic involvement of the classical PAN, localized diseases of the gallbladder, uterus, testis, and skin have been reported. In particular, a limited involvement of the appendix is an unusual manifestation of PAN and usually runs a favorable prognosis when compared with the classical PAN. We described a 13-year-old woman with a limited form of PAN presenting as acute appendicitis without other systemic manifestations. She recovered after exploratory laparotomy and appendectomy without administration of steroid or immunosuppressant.
김환석(Kim Hwan-Suk),김명진(Kim Myong-Jin) 한국생명윤리학회 2008 생명윤리 Vol.9 No.1
과학 실험의 내용은 해당 전문 연구자가 아니면 이해하기 어렵고, 연구가 진행되는 실험실은 일반인이 접근하기 어려운 공간이다. 따라서 연구과정에서 나타날 수 있는 부정행위나 비리 등의 문제점에 대한 제보는 동료 연구자와 같은 ‘내부자’가 맡을 수밖에 없다. 이는 곧 과학계에서 연구진실성을 유지하려면 내부 제보자를 보호하는 것이 결정적으로 중요하다는 사실을 뜻한다. 그러나 제보자는 종종 소속 연구기관이나 피고발인 등으로부터 보복과 불이익을 당하는 경우가 많다. 비민주적이고 자기방어적인 조직문화를 지닌 우리나라에서는 특히, 제보자는 ‘밀고자’ 또는 ‘배신자’로 사람들에게 배척을 당하거나 조직에 의해 치명적인 보복을 당하기 일쑤이다. 황우석 사건의 제보자도 직장에서 쫓겨났으며 오랫동안 도피생활을 할 수밖에 없었다. 우리나라에서 제보자 보호를 위해 마련된 제도적 장치는 2001년 제정된 〈부패방지법〉과 2007년에 제정된 <연구윤리 확보를 위한 지침>이 있으나, 두 가지 모두 연구부정행위의 제보자를 보호하는 데는 실효성이 떨어진다. 따라서 제보자 보호를 위한 법적·제도적 장치의 강화와 더불어 제보자 소속 연구기관의 인식 전환이 필요하다. 제보자를 ‘조직의 배신자’로 낙인찍던 태도에서 ‘조직의 건강성을 높이는 용감한 사람’으로 보는 획기적 인식 전환이 있어야 연구부정행위가 방지되고 건전한 연구윤리의 확보가 가능해질 것이다. The content of scientific experiments can hardly be understood by non-experts, and research laboratories are the spaces to which lay people cannot get access. Therefore, whistleblowing misconducts from research process tends to be done by such 'insiders' as colleague researchers. This implies that it is vitally important to protect whistleblowers in oder to keep research integrity in scientific communities. But whistleblowers are susceptible to disadvantages and retaliation from their research institutions or the accused. Since Korea has undemocratic and self-defending organizational culture, it is usual with whistleblowers to suffer from ostracism (as 'informer' or 'betrayer') and fatal retaliation. The whistleblower of the Hwang Woo-Suk's misconduct was expelled from his job and had to escape from retaliation from Hwang's supporters for a long time. The Prevention of Corruption Law(2001) and the Guideline for Research Ethics(2007) are the two institutional arrangements which contain codes for the protection of whistleblowers in Korea. However, both of them are not effective to protect whistleblowers of research misconduct. What we need are not only reinforcement of legal and institutional arrangements but also change of thought on whistleblowers by their research institutions. To prevent research misconduct and promote sound research ethics, we need to change our thought on whistleblowers as from 'a betrayer of organization' to 'a brave person who raises healthiness of organization'.