피로과정에서 S45C강의 반가폭과 잔류응력의 변화양상

부명환,박영철,김병수,이종문 한국비파괴검사학회 2002 한국비파괴검사학회지 Vol.22 No.5

기계구조물의 피로과정에 대한 손상정도를 평가하기 위하여 X선 회절을 이용하여 반가폭 및 하중방향과 수직방향에서의 2축에 대한 잔류응력의 변화를 측정하였다. 반가폭은 피로과정의 초기에는 큰 변화를 보이지만 피로수명비의 약10∼20%이후에는 큰 변화를 보이지 않았다. 2축 방향에 대한 잔류응력은 피로수명비의 40% 전후에서 길이방향의 경우는 감소와 증가를, 폭방향의 경우는 증가와 감소를 하였으며, 응력진폭이 클수록 잔류응력의 절대 값은 커지는 증가하는 경향을 나타내었다. The purpose of this study is to examine the change of full width half maximum(FWHM) and residual stress during fatigue process in S45C Steel by X-ray diffraction. For S45C Steel, the relationship between the change in fatigue damage of the specimen and the FWHM, and residual stress of X-ray diffraction profiles during the fatigue processes has been investigated. The FWHM decreases in the early period of fatigue cycle. The change of FWHM is associated with cyclic work hardening. The change of the FWHM is not significant in 10∼20% of ratio of fatigue life. The residual stress is changed with fatigue cycle increasing during the fatigue process.

맥반석의 용출시험 및 중금속 흡착특성

김종부,신명국,성낙환,최문정,김경주,이동석 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A

This experiment was done to investigate the leaching and adsorption properties of heavy metals on porphyry. The comparison with respect to the leachability of heavy metals from porphyry between the Korea Standard Leaching Test (KSLT) and the Toxicity Characteristic Leaching Procedure (TCLP) was carried out. The fractional composition of leachate and the total concentration of heavy metal of porphyry were studied through Sequential Extraction Procedure (SEP) and EPA Method 3050. Adsorption experiment of porphyry has pointed out that the optimum dosage of porphyry for 50ppm Pb was over 10g/L, the effective particle size for absorption was below 200 mesh and the optimum pH was about 7. From the Freundlich' adsorption equation, l/n was 1.0722, and k was 0.0041. After adsorption, the fractional composition of Pb was changed. The exchangeable, carbonate, reducible fractions were increased, and the organic fraction was not changed, and the residual fraction was decreased.

BGA패키지에서의 무연솔더 접합부 전단 시험법의 최적화

김종웅,문정훈,서창제,정승부 대한금속ᆞ재료학회 2006 대한금속·재료학회지 Vol.44 No.3

부산광역시 일부하천의 계절적·년도별 수질특성 비교분석

정유진,문종익,성낙창,김부길,이영형 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.1

This study is carried out to investigate the water quality change trends in Pusan Metropolitan streams. The temperature of the streams are moderate except in winter period and this can be explained by the Korean meterological characteristics. The pH does not vary by the time but some points are a little low. BOD_(5) and COD_(Mn), the index of water contaminants, be shown as characteristic domestic waste water patterns. The nutrient matters, such as total nitrogen and total phosphate, are appeared to be low. The chronic water quality, as BOD_(5) and COD_(Mn), shows that the loading rates in 1998 are smaller than the past(1983, 1992). Some points show a little high loading in autumn, but this needs more investigation to make clear the cause(s).

하수슬러지와 귤껍질의 혼합첨가에 의한 산성토양 교정효과

문종익(Jong-Ik Moon),최성문(Sung-Moon Choi),성늬창(Nak-Chang Sung),허목(Mock Huh),김부길(Boo-GiI Kim),김철(Chul Kim) 유기성자원학회 2001 유기물자원화 Vol.9 No.2

본 연구에서 밭토양은 부산시의 평균 pH 인 인공 산성우(pH=5 , 34) 조건에서 실험되어졌다 . 그리고 산성토양 중화능을 확인하기 위해 토양산도 CEC(양이온 치훤능력)와 K, Ca, Na와 같은 알칼리 금속에 대해 분석하였다. 굴껍질은 치환성 양이온을 다량 함유하고 있기 때문에 산성 토양 개선제로의 역할을 할 수 있을 것이고 하수슬러지의 토양 첨가는 슬러지 처분의 대체 방안으로 기대된다. 본 연구의 목적은 하수슬러지 및 굴껍질의 적정처리방법으로 산성토양에 주입시 그 개선효과를 검토하고자 하였다, 토양과 하수슬러지의 비율을 각각 10:0, 9:1, 8:2,7:3으로 한것과 토양 : 하수슬러지와 굴껍질 흔합물의 비율을 각각 9:1, 8:2, 7:3으로 한것을 대상토양에 첨가하였다. 실험 결과, 토양산도는 약간 감소하였고 CEC는 약간 증가하는 경향을 나타내었다, 알칼리 금속의 경우는 실험기간동안 지속적으로 감소되어져 토양산도 CEC와는 다른 농도경향을 나타내었다‘ 결과적으로 굴껍질이 흔합된 하수슬러지는 산성토양 개선제로서 역할을 할 수 있음을 확인하였다 In this study,farm soil was tested under artificial acid rain(pH = 5.34), which is average pH of Pusan metropolitan area. And to find out the soils acid neuralozation capacity, soil acidity, CEC(cation exchange capacity) and akalone meatals, such as , Ca and Na were tested. Because oyster shells(OS) had alrge portion of alkaline netals, OS could play a role in acid soil anendment. And soi addition fo sewage treatment sludge(STS) could be a altemative for disposal method. The purpose of this study is to evaluate acid soil amendment using STS and OS. In case of soil and STS, mixing ratio was 10:0, 9:1, 8:2 and 7:3. And STS mixed OS was also added in acid soil as same ratio as STS. Throught the experiment, soil acidity was stationary state with slight decrease, and CEC was also stationafy state but with slight increase. Alkalime metals showed differences in concentration, but all of them were tend to decrease.

카드뮴과 비소의 생쥐 치사독성에 대한 카드뮴과 비소의 교차전처리효과

부문종(Moon Jong Boo) 한국환경생물학회 2001 환경생물 : 환경생물학회지 Vol.19 No.2

N/A Whether the pretreatment of sublethal arsenic or cadmium may prevent from lethality of arsenic or cadmium to mice, respectively, and also the protection against to lethality of arsenic or cadmium which might be induced by pregreatment of arsenic or cadmium may be related with their hepatic glutathione contents were investigated. When sodium arsenite or cadmium chloride was subcutaneously injected to mice(ICR strain) using lethal doses, all mice of both group were killed. The mortality of mice which were subsequently injected with lethal arsenic 24 hours after pretreatment of sublethal arsenic was decreased, and the same result was obtained in the case of cadmium. Sublethal pretreatment of arsenic or cadmium prior to lethal arsenic or cadmium treatment to mice, respectively, didn`t decrease hepatic glutathione contents of the survived mice, while decreases of that contents in liver were observed in the mice just after they died. Cadmium pretreatment decreased mortality of mice which subsequently injected with lethal arsenic, while arsenic pretreatment didn`t protect against cadmium lethality. These results indicate that protection against arsenic or cadmium lethality to mice induced by pretreatment of sublethal arsenic or cadmium may be directly related to other factors induced by sublethal camium pretreatment, not to hepatic glutathione contents.

카드뮴 전처리에 의한 생쥐의 카드뮴 치사 완화효과와 간 glutathione 함량과의 상관성

부문종(Moon Jong Boo) 한국환경생물학회 2000 환경생물 : 환경생물학회지 Vol.18 No.1

Which sublethal cadmium pretreatment may prevent from lethal cadmium`s killing mice and which cadmium pretreatment-induced protection against cadmium lethality to mice may be related with their hepatic glutathione contents were investigated. When cadmium chloride was subcutaneously injected to mice(ICR strain) at various doses, all mice died, which treated with cadmium at dose of 300 μmoles/㎏ or more, and none died, which treated with cadmium at dose of 80 μmoles/㎏ or less. Subcutaneous pretreatment of sublethal cadmium decreased sacrifice of mice which subsequently injected with lethal cadmium, with most effectiveness at pretreatment dose of cadmium of 40 μmoles/㎏ b.w. and at 48 hours of interval between sublethal cadmium pretreatment and lethal cadmium treatment. Even if a great part of the cadmium-pretreated mice were sacrificed while treated with lethal cadmium, they survived longer than the non-pretreated mice. Sublethal cadmium pretreatment(40 μmoles/㎏ b.w.) 48 hours before lethal cadmium treatment to mice didn`t decrease hepatic glutathione contents of the survived mice, while decreases in the glutathione in livers were observed in the mice just after died. These results indicate that sublethal cadmium pretreatment-induced protection against cadmium lethality to mice may be related to their hepatic glutathione contents. [Cd pretreatment, Cd lethality, Hepatic glutathione contents].

P137 : A study of the effects of physical dermabrasion combined with chemical peeling

( Boo Kyoung Kang ),( Tae In Kim ),( Myong Il Bae ),( Sung Hyuk Moon ),( Ki Heon Jeong ),( Jong Min Park ),( Dong Hye Suh ),( Sang Jun Lee ),( Min Kyung Shin ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2

Background: Many comparative studies of chemical peeling and dermabrasion have been reported. However, no basic scientific data about the immediate effects after combined treatment of chemical peels and dermabrasion have been confirmed. Objectives: To evaluate the effect of the application of physical abrasion in combination with chemical peels. Methods: Three porcine were treated with physical abrasion using a water jet device in combination with an α-hydroxy acid solution, and the controlled skin samples received chemical peeling solution alone. The levels of growth factors and neuropeptides were measured with a multiplex immunoassay. Results: Skin treated with physical dermabrasion combined with chemical peeling showed prominent detachment and swelling of the stratum corneum, and fluid collection in the hair follicles. The mean cell count of CD34 positive fibroblasts and mast cells, levels of epidermal growth factor, fibroblast growth factor-2, vascular endothelial growth factor and neurotensin were significantly increased in the tissue treated with physical assault combined with a chemical peeling agent compared to the controlled skin. Conclusion: We concluded that physical dermabrasion combined with chemical peeling can be more effective than chemical peeling for the approach through the hair follicle.

Formation of CuInSe₂ Absorber Layers Formed Using Co-Electrodeposition Combined with Selenization

Moon, Kyungwon,Lee, Young-Boo,Ahn, Kwang-Soon,Choi, Chel-Jong American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.7

<P>Stoichiometric CuInSe2 absorber layers were formed using co-electrodeposition coupled with selenization. We investigated the influence of the metal ion ratio, supporting electrolyte, and deposition voltages on the structural and chemical properties of Cu-In alloys. The increases in deposition voltage and metal ion concentration helped to form In-rich Cu-In alloy with dendrite structure composed of a long central trunk with secondary branches. In addition, on increasing the concentration of the supporting electrolyte, the ratio of In to Cu in the Cu-In alloy increased, and surface morphology improved. Finally, based on an optimized co-electrodeposition process, the selenization of Cu-In alloys using the evaporation of the Se element was employed to form high quality CuInSe2 absorber layers.</P>

Microstructural and chemical properties of Cu‐In alloys formed using co‐electrodeposition

Moon, Kyung‐,Won,Ashok Kumar, A.,Lee, Young‐,Boo,Park, Yang‐,Kyu,Choi, Chel‐,Jong John Wiley Sons, Ltd 2012 Surface and interface analysis Vol.44 No.11

<P>We investigated the microstructural and chemical properties of Cu‐In alloys formed on Au‐coated Si substrates using co‐electrodeposition. The co‐electrodeposition was performed using electrolytic solutions with various molar ratios of CuCl<SUB>2</SUB> and InCl<SUB>3</SUB> (1 mM/5 mM, 2 mM/4 mM, and 5 mM/5 mM) at room temperature. With increased electrodeposition current, the concentrations of Cu and In atoms in the Cu‐In alloys decreased and increased, respectively. Because of the preferential growth of Cu, a decrease in the molar ratio of CuCl<SUB>2</SUB> and InCl<SUB>3</SUB> led to a reduction in the minimum electrodeposition current that is required to obtain Cu‐In alloys with the same concentration of Cu and In atoms. The increases in electrodeposition current and the molar ratio of CuCl<SUB>2</SUB> and InCl<SUB>3</SUB> facilitated the formation of Cu‐In dendrites with long central trunks and secondary branches. The dendrites could be associated with autocatalytical alloy growth driven by a concentric diffusion field of metal ions on a thermodynamically unstable surface. During co‐electrodeposition using electrolytic solution (CuCl<SUB>2</SUB> = 1 mM and InCl<SUB>3</SUB> = 5 mM) under an electrodeposition current of 20 mA, the increase in the cathodic overpotential caused by surface irregularity led to the formation of Au‐In, which could be a main cause of the observed hillock formation. Copyright © 2012 John Wiley & Sons, Ltd.</P>