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Insulated, Passivated and Adhesively-Promoted Bonding Wire using Al2O3 Nano Coating
Soojae Park,Eunmin Cho,Myoungsik Baek,Eulgi Min,Kyujung Choi 한국마이크로전자및패키징학회 2024 마이크로전자 및 패키징학회지 Vol.31 No.2
Bonding wires are composed of conductive metals of Au, Ag & Cu with excellent electrical conductivities for transmitting power and signals to wafer chips. Wire metals do not provide electrical insulation, adhesion promoter and corrosion passivation. Adhesion between metal wires is extremely weak, which is responsible for wire cut failures during thermal cycling. Organic coating for electrical insulation does not satisfy bondability and manufacturability, and it is complex to apply very thin organic coating on metal wires. Automotive packages require enhanced reliability of packages under harsh conditions. LED and power packages are susceptible to wire cut failures. Contrary to conventional OCB behaviors, forming gas was not required for free air ball formation for both Ag and Pd-coated Cu wires with Al2O3 passivation.
문수재,이수경,김정현,박계숙 연세대학교 생활과학연구소 1998 生活科學論集 Vol.12 No.-
The iron nutritional status of 245(20-65 year old) women in Seoul area was evaluated using a dietary survey and a measurement of hematological indices. The serum iron was measured by Red Blood Cell(RBC), Hemoglobin(Hb), Hematocrit(Hct), Serum Iron(S-Fe), Total Iron Binding Capacity(TIBC), Trasnferrin Saturation(TS) and Serum Ferritin(SF) and was analyzed with the information obtained by interviews which included socio-demographic variables and the dietary pattern of the subjects. The mean Hb was 12.4±1.14g/㎗, Hct was 37.5±3.28%. S-Fe was 68.8±27.3㎍/㎗ and TIBC was 354.1±129.18㎍/㎗. The mean TS(%) was 21.7±10.52%. The mean SF was 53.6±50.22ng/㎖. The iron deficiency anemia women of the subject estimated at 26.3% by using Hb(<12g/㎗), 23.1% by Hct(<36%), 55% by S-Fe(<70㎍/㎗), 35% by TIBC(<289㎍/㎗), 40% by TIBC(<359㎍/㎗), 30% by TS(<16%), and 20% by SF(<10ng/㎗). The Red Blood Cell(RBC) showed a negative correlation with age, income and Hb, Hct with education and income level. However TIBC showed a positive correlation with education and Hb and Hct showed a positive correlation with age of menarche, activity and total energy expenditure per day. In dietary data, energy, protein, carbohydrate, fat, iron and Vit. C intake showed a positive correlation with Hb and Hct. In particular, heme iron showed a positive correlation with all hematological indices expect TIBC but nonheme iron showed a negative correlation with RBC, Hb, Hct. The results of the multiple regression analysis with all the variables and hematological indices, Hb showed a correlation of 34% with age of menarche and 32% with energy, and Hct showed a correlation of 35% with nonheme iron and 34% with age of menarche. The TIBC showed a correlation of 36% with age of menarche. S-Fe showed a correlation of 53% of the total energy expenditure. When divided into anemia and normal groups, the anemia group was estimated lower in intake of energy, protein, iron, Vit. C than the normal group. In particular, the iron intake of the anemia group was 68% of RDA. The heme iron intake was 5.3㎎ in normal troup and was 3.9㎎ in the anemia group. Otherwise, the level of nonheme iron intake was 9.9㎎ in the normal group and was 6.7㎎ in the anemia group. Both serum Zn(s-Zn) and serum Cu(s-Cu) level were estimated at 0.11㎎/㎗. The s-Zn level was 0.11㎎/㎗ in the normal group, was 0.10㎎/㎗ in the anemia group. The s-Cu level was 0.10㎎/㎗ in the normal group and was 0.12㎎/㎗ in the anemia group.
조현구,박수자,추창오 한국광물학회 2004 광물과 암석 (J.Miner.Soc.Korea) Vol.17 No.3
구리 흡착 실험과 MINTEQA2 및 FITEQL3.2 컴퓨터 프로그램을 이용하여 고성군 판곡리에서 산출되는 황토 현탁액의 구리 흡착 특성을 연구하였다. 구리 흡착 실험은 pH, 구리 용액의 양, 전해질의 이온 세기를 변화시키면서 실시하였고, 구리의 농도는 유도결합플라즈마분광분석기를 사용하여 분석하였다. 첨가하는 구리 이온의 양과 pH가 증가할수록 흡착되는 구리 이온의 양도 증가한다. 특히 pH가 5.5에서 6.5로 변할 경우 급격한 흡착률의 증가가 있으며, pH 7.5에서 거의 100% 흡착된다. 배경 전해질의 이온 세기에 영향을 받지 않는 것으로 보아 구리 이온은 황토 표면과 내부권 복합체(inner-sphere complex)로써 아주 강한 화학적 결합을 하고 있는 것으로 판단할 수 있다. MINTEQA2 프로그램을 이용하여 구리의 화학종 분포를 계산한 결과, pH가 증가함에 따라 Cu^(²+)의 농도는 점점 감소하고 Cu(OH)₂농도는 점점 증가한다. FITEWL3.2 프로그램을 이용하여 황토의 표면을 규산염 광물 자리와 산화염 광물 자리로 나눈 two sites-three pKas 모델을 적용하여 흡착 양상을 모델링한 결과, 구리 용액의 부피가 2~6 mL인 경우 구리 흡착 평형 상수 값을 도출할 수 있었다. 철산화염 광물 반응 자리에 흡착되는 구리의 양은 pH 4.5~6.5 범위에서 급격한 흡착 양상을 보이다가 그 이상 pH에서는 흡착되는 양이 조금씩 밖에 증가하지 않는다. 규산염 광물 반응 자리에 흡착되는 구리의 양은 구리 용액의 양이 적을 때는 미약하다가 구리 용액의 양이 커질 경우 그 양이 많아진다. 침전에 의하여 제거되는 구리의 양은 광물 표면 자리에 흡착되는 양과 비교하면 아주 적다. 구리 이온에 대한 흡착 친화도는 규산염 광물보다는 철산화염 광물이 더 큰 것으로 판단된다. Adsorption behavior of Cu onto Hwangto, from Pankok-ri, Kosung-gun, suspension was studied using Cu batch adsorption experiment and computer program MINTEQA2 and FITEQL 3.2. The sorption of copper was investigated as a function of pH, copper concentration and NaNO_₃background concentration (0.01 and 0.1 M). The concentration of copper was analyzed using ICPAES. The sorption of copper onto Hwangto suspension increased with increasing pH and copper concentration. The adsorption percentage of copper drastically increased from pH 5.5 to 6.5, and reached nearly 100% at pH 7.5. Because the amount of copper solution and the ionic strength of background electrolyte may not affect the sorption of copper onto Hwangto, the copper ion may be combined at the surface of Hwangto as an inner-sphere complex. Using the MINTEQA2 program, the speciation of copper was calculated as a function of pH and copper concentration. Hie concentration of Cu^(²+) decreased and that of Cu(OH)₂increased with increasing pH. The uptake of copper in the Hwangto suspension was simulated by FITEQL3.2 program using two sites-three pKas model, which is composed of silicate reaction site and Fe oxide reaction site. The copper absorption reaction constants were calculated in the case of 2~6 mL of copper solution. The Fe oxide reaction site rapidly adsorbs copper ion between pH 4.5~6.5. Silicate reaction site adsorbs little copper ion at low copper concentration but much at high copper concentration. The removal amount of copper by precipitation was negligible in comparison with that of adsorption. The Fe oxide reaction site may has higher adsorption affinity of copper ion than silicate reaction site.
이양자,이종호,문수재,오경원,최윤선,박계숙 연세대학교 생활과학연구소 1997 生活科學論集 Vol.11 No.-
The purpose of this study was to examine both changes in serum lipid concentrations of Yonsei faculty members and correlations between these serum lipid levels and other metabolic or anthropometric parameters. The results are summarized as follows. 1. When the data of '93 and '95 were compared by age and sex, no significant change in serum lipid concentrations was observed. 2. When the subjects were divided into three groups according to PIBW, those below 120% showed a decreasing trend and those above 120% showed an increasing trend in serum triglyceride concentrations. 3. When the data of '93 and '95 on serum lipids and blood pressure were compared, concentrations of LDL-cholesterol (p<0.05) and LDL/HDL cholesterol ratio (p<0.01) of women with abnormal blood pressure were found to be higher than those of women with normal blood pressure. 4. When the correlations between age, blood pressure, serum lipids, and PIBW were analyzed, the PIBW of men was positively correlated with systolic & diastolic blood pressure, serum triglyceride, total cholesterol, LDL-cholesterol concentrations and the ratio of LDL/HDL cholesterol. For women the PIBW was positively correlated with age, systolic and diastolic blood pressure. From this study both overweight and blood pressure were suggested to be important factors affecting metabolic & health parameters related to the development of chronic diseases. It can be strongly recommended that weight-control programs should be developed and implemented for university professors and staffs with strong support from health-related sectors at both university and government levels.
이양자,이종호,문수재,박계숙,김숙영,신현아 연세대학교 생활과학연구소 1994 生活科學論集 Vol.8 No.-
The purpose of this study was to determine the distribution patterns of serum triglyceride (TG) and cholesterol(Chol) concentrations by sex and age, in 731 Yonsei faculty and staff members (431 men and 318 women), and the relation of dietary habits to serum lipids in 189 participants (118 men and 71 women). The results are summarized as follows. 1. The levels of serum TG and Chol increased with age in both sexes; the level of Chol became higher in women than in men after the age of 50. The distribution patterns of serum TG and Chol concentrations of men in their thirties were different from those of the men in their twenties, and a clear difference, in concentrations of serum TG and Chol existed between women in their forties and women in their fifties. 2. The mean level of serum Chol was lower among subjects in both sexes who weighed below normal. In men, the mean level of serum TG was higher among subjects who weighed above normal. 3. The factor showing the significant negative correlation with serum lipids was drinking (p<0.05) in both sexes.