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0.002% 보론첨가 저탄소강의 미세조직 및 기계적 성질에 미치는 열처리의 영향
임종호,김종식,박병호,이진현,최정묵,Lim, Jong-Ho,Kim, Jong-Sik,Park, Byung-Ho,Lee, Jin-Hyeon,Choi, Jeong-Mook 한국재료학회 2011 한국재료학회지 Vol.21 No.6
The effect of heat treatment on the micro-structures and the mechanical properties of 0.002% boron added low carbon steel was investigated. The tensile strength reached the peak at about $880-890^{\circ}C$ with the rising quenching temperature and then the hardness decreased sharply, but the tensile strength hardly decreased. The tensile and yield strength decreased and the total elongation increased with a rising tempering temperature, but the tensile and yield strength sharply fell and the total elongation prominently increased from above a $400-450^{\circ}C$ tempering temperature. Tempered martensite embrittlement (TME) was observed at tempering condition of $350-400^{\circ}C$. In the condition of quenching at $890^{\circ}C$ and tempering at $350^{\circ}C$, the boron precipitates were observed as Fe-C-B and BN together. The hardness decreased in proportion to the tempering temperature untill $350^{\circ}C$ and dropped sharply above $400^{\circ}C$ regardless of the quenching temperature.
산화성 고온 리튬용융염계 분위기에서 Pyro-Carbon의 부식거동
임종호,최정묵,Lim, Jong-Ho,Choi, Jeong-Mook 한국재료학회 2013 한국재료학회지 Vol.23 No.2
The electrolytic reduction of a spent oxide fuel involves liberation of the oxygen in a molten LiCl electrolyte, which is a chemically aggressive environment that is too crosive for typical structural materials. Therefore, it is essential to choose the optimum material for the process equipment for handling a molten salt. In this study, the corrosion behavior of pyro-carbon made by CVD was investigated in a molten LiCl-$Li_2O$ salt under an oxidation atmosphere at $650^{\circ}C$ and $750^{\circ}C$ for 72 hours. Pyro-carbon showed no chemical reactions with the molten salt because of its low wettability between pyro-carbon and the molten salt. As a result of XRD analysis, pyro-carbon exposed to the molten salt showed pure graphite after corrosion tests. As a result of TGA, whereas the coated layer by CVD showed high anti-oxidation, the non-coated layer showed relatively low anti-oxidation. The stable phases in the reactions were $C_{(S)}$, $Li_2CO_{3(S)}$, $LiCl_{(l)}$, $Li_2O$ at $650^{\circ}C$ and $C_{(S)}$, $LiCl_{(l)}$, $Li_2O_{(S)}$ at $750^{\circ}C$. $Li_2CO_{(S)}$ was decomposed at $750^{\circ}C$ into $Li_2O_{(S)}$ and $CO_{2(g)}$.
150 MW급 가스터빈 저압 1단 회전익 교체주기 연장 가능성 연구
임종호,이재헌,Lim, Jong-Ho,Lee, Jae-Heon 한국플랜트학회 2013 플랜트 저널 Vol.9 No.4
국내 A 복합발전소에서 운전 중인 150 MW급 가스터빈 저압 1단 회전익의 교체주기 연장가능성을 다각적으로 모색하였다. 제작사가 추천한 24,000 등가운전시간 이상을 사용한 저압 1단 회전익의 외관검사, 열차폐코팅 제거 후 모재의 표면검사 및 균열검사를 각각 실시하였다. 또한 제작사별 150 MW급 가스터빈의 교체주기를 비교 분석하였다. 제작사가 추천한 24,000 등가운전시간 이상이 경과하여 27,000 등가운전시간을 운전한 저압의 외관을 검사한 결과 냉각홀 부위에 다수의 균열이 관찰되었다. 그러나 열차폐코팅을 제거한 상태에서 실시한 모재의 표면검사에서는 균열이 거의 관찰되지 않았으며, 모재까지 진행된 일부 미세 균열에 대해서는 절단면 검사를 통하여 균열깊이가 기능에 영향을 미치지 않는 수준임을 확인하였다. 따라서 본 연구대상 가스터빈 저압 1단 회전익의 교체정비주기는 현행 24,000 등가운전시간에서 3,000 등가운전시간의 연장이 가능할 것으로 보인다. 또한 연구대상 저압 1단 회전익에 대하여 제작사가 추천한 교체주기는 타제작사 1단 회전익 교체주기의 2/3 수준으로 짧게 설정되어 있어 교체주기 연장이 가능할 것으로 판단된다. In order to extend a hot gas parts replacement cycle of a gas turbine, blade row 1 from low pressure turbine, which has a significant impact on the cycle, has been selected from stored set after one cycle use. Taking into account the status of the first stage moving blade in LP turbine operated more than 27,000 equivalent operating hours(EOH) and the replacement cycle in the same type of gas turbine, the replacement of the high temperature components installed on the GT, a study subject, can be extended from 24,000 to 27,000 EOH.
LiCl-Li<sub>2</sub>O 용융염에서 Inconel 합금 및 Incoloy 800H의 고온 부식거동
임종호,최정묵,Lim, Jong-Ho,Choi, Jeong-Mook 한국재료학회 2013 한국재료학회지 Vol.23 No.2
A study on the corrosion behavior of Inconel alloys and Incoloy 800H in molten salt of LiCl-$Li_2O$ was investigated at $650^{\circ}C$ for 24-312 hours in an oxidation atmosphere. The order of the corrosion rate was Inconel 600 < Inconel 601 < Incoloy 800H < Inconel 690. Inconel 600 showed the best performance suggesting that the content of Fe, Cr and Ni are the important factor for corrosion resistance in hot molten salt oxidation conditions. The corrosion products of Inconel 600 and Inconel 601 were $Cr_2O_3$ and $NiFe_2O_4$, In case of Inconel 690, a single layer of $Cr_2O_3$ was formed in the early stage of corrosion and an outer layer of $NiFe_2O_4$ and inner layer of $Cr_2O_3$ were formed with an increase of corrosion time. In the case of Incoloy 800H, $Cr_2O_3$ and $FeCr_2O_4$ were observed. Most of the outer scale of the alloys was observed to be spalled from the results of the SEM analysis and the unspalled scale which adhered to the substrate was composed of three layers. The outer layer, the middle one, and the inner one were Fe, Cr, and Ni-rich, respectively. Inconel 600 showed localized corrosion behavior and Inconel 601, 690 and Incoloy 800H showed uniform corrosion behavior. Ni improves the corrosion resistance and too much Cr and/or Fe content deteriorates the corrosion resistance.
임종호,김태현,이승원,Lim, Jong-Ho,Kim, Tae-Hyun,Lee, Seoung-Won 한국재료학회 2006 한국재료학회지 Vol.16 No.11
Synthesis of Iron oxides by air oxidation of $FeSO_4$ solutions in the presence of NaOH, Diethylenetriamine (DETA), Butylamine (BA) and influence of ultrasonic wave were investigated by XRD, SEM and particle size analyzer. As the DETA addition increased to 0.05 mol, $Fe_3O_4$ was formed with goethite($\alpha$- FeOOH) and $Fe_3O_4$ single phase was formed above 0.18mol of DETA. As the BA addition increased, the XRD peak intensity of (020) face of lepidocrocite($\gamma$-FeOOH) was developed until the formation of $Fe_3O_4$ and reduced the size of the iron oxide particles formed. Ultrasonic wave reduced the size of the iron oxide particles but gave little effects on the iron oxide particles synthesized by amine.
임종호 ( Jong Ho Lim ),김혜성 ( Hei Sung Kim ),김형옥 ( Hyung Ok Kim ),김범준 ( Beom Joon Kim ),최순용 ( Soon Yong Choi ),박영민 ( Young Min Park ) 대한피부과학회 2010 대한피부과학회지 Vol.48 No.1
Background: Although warts are common viral infections of the skin, no single optimal treatment has been determined and most warts are resistant to the current treatment modalities. As a result, many patients suffer from viral warts. Nevertheless, there have been few studies on the patients` quality of life and the economic burden associated with viral warts. Objective: The purpose of this study is to assess the quality of life and the economic burden in the population affected by viral warts by administering a survey questionnaire. Methods: A questionnaire quoted from the Dermatology life Quality Index was administered to one hundred twenty patients who had viral warts. Results: The data for the quality of life revealed that warts do not particularly affect the patient`s daily living activities nor their psychological status. However, the data indicated that the treatment of warts had significantly negative effects on the quality of life of our patients. With regard to treatment satisfaction, many were unsatisfied with `the pain associated with treatment`. The estimated cost for the treatment of warts was 45,900 won per treatment and the estimated total treatment expenditure of each patient was 236,800 won. Conclusion: These results suggest that warts significantly affect the patients` quality of life and especially due to its resistance to treatment and the pain associated with the treatment. Moreover, warts can impose a considerable economic burden. (Korean J Dermatol 2010;48(1):33∼38)
임종호(Jong-Ho Lim) 한국정신과학학회 2013 한국정신과학회 학술대회 논문집 Vol.2013 No.10
현대의학은 특정 증상의 생산만 선택적으로 고장 내는 전략을 구사하고 있기에, 엄밀히 말해, 치료가 아니다(인간기계론). 문제 해결이 아니라, 문제를 가리는 술수가 현대의학의 본질이다. 질병의 원인이 급성으로 사라지는 경우인 급성질환에는 나름의 가치가 있지만, 만성적으로 존재하는 경우에는 무력한 의학이다. 만성적으로는 존재하는 원인이란 바로 건강하지 못함이다. 그러기에 질병을 대상으로 할 것이 아니라, 건강을 대상으로 하는 의학이 절실히 필요하다. 숨을 남이 쉬어 줄 수 없듯이, 건강이란 스스로의 문제이기에, 언제나 스스로 도모해야 한다. 여기에 모든 국민이 스스로 실천할 수 있는 쉬운 방법을 소개한다. Modern medicine’s-human machine-strategy is to inhibit the production of specific symptoms. Therefore, if the cause of disease is acute, yet it is worth. But if there is a chronic cause, modern medicine is the helpless. Cause of chronic is just un-healthy. Therefore, The subject of the medicine must be not disease, but health(or heart). Just as others can do not breath of mine, instead of me, Health is a matter of itself. Here the method(health producing) is introduced.