Sn-3.5Ag 솔더 범프 플립칩의 무플럭스 열초음파 접합

洪淳珉,姜春植,鄭在弼 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.6

The thermosonic bonding was investigated as a fluxless solder bump flip chip bonding method. The 100 ㎛-diameter Sn-3.5 mass%Ag solder bumps were formed on test flip chip by laser ball bonding process. The test flip chips were bonded to a TSM-coated glass substrate using thermosonic bonding method at different temperature, bonding load and ultrasonic power. The die shear strength was evaluated and fracture surfaces were examined with SEM. The Sn-3.5Ag solder flip chip bonding was possible at lower temperature than the melting point of the solder. The die shear strength increased with increasing bonding temperature, bonding load, and ultrasonic power. However, at excessive bonding load condition over 1.0 N/bump, the die shear strength decreased due to the fracture at UBM/ Si-chip interface. The bump height decreased with increasing bonding load but did not change with ultrasonic power.

전자식 안정기의 고조파 저감 대책

洪淳錫,吳政錫,兪泰君 弘益大學校 産業技術硏究所 2004 産業技術 Vol.14 No.-

Electric ballast is widely used to turn on the fluorescent. Electric ballast measures occurrence of harmonic through the actual measurement and it is simulated by modeling equivalent circuit for harmonic analysis. The purpose of this paper is to give an equivalent circuit modeling methodology for the harmonic currents generated by single-phase loads to evaluate a commercially available series resonant filter for the harmonic currents compensation based on the IEC std 61000-3-2 and IEEE 519-1992 standards for limiting harmonic distortion.

KLEINE-LEVIN 증후군 2례

홍순형,정인과,김순범,한선호,곽동일,이병윤 大韓神經精神醫學會 1981 신경정신의학 Vol.20 No.2

The Kleine-Levin syndrome is composed of recurring episodes of sleepiness lasting days, associated with excessive appetite and often with abnormal behavior. The authors reported two cases of the Kleine-Levin syndrome. The results were as follows: 1. They were adolescent male patients. 2. The onsets were predisposed by psychological stresses of school examinations. 3. Their electroencephalograms revealed abnormal findings only during episodes of hypersomnolence. 4. One of them was improved by treatment with imipramine and lithium.

尋常性좌창(Acne Vulgaris)에 對한 Vibramycin의 臨床的效果

洪起煥,安順姬,朴定圭,李水月 中央醫學社 1973 中央醫學 Vol.25 No.4

尋常性?瘡이 顔面에 甚한 女高生 40名을 double-blind試驗에 依하여 Vibramycin(Vibramyin 100mg을 1日 1回 經口的으로 投與)을 投與하여 다음의 結果를 얻었다. 1) Vibramycin 4週間 投與하였을 때 治癒率 은 80.0%이고 placebo를 投與時는 29.3%를 나타내었다. 그리고 治療效果는 投藥 3週에 顯著이 나타나기 始作하였다. 2) 投藥中止後 3週에는 治癒率이 Vibramycin 投藥群에서 減少를 보였으며 2名은 再發되었다. 3) 投藥 4週동안 治療效果가 不充分한 患者에게 3週間 더 延長하였을 때는 더욱 顯著한 效果를 볼 수 있었다. Forty high school girls with acne vulgaris were included in a double-blind trial to assess the tLapeu tic effect of Vibramycin (100 mg Vibramycin capsule, orally, once daily). The results, assessed clinically are as follows; 1. When Vibramycin was administered for 4 weeks, the cure rate showed 80. 0% and in the case of placebo, 29.3%, and the effectiveness was significantly appeared at 3 weeks of treatment. 2. In follow-up study, at 3 weeks after cessation of Vibramycin treatment, the cure rate decreased in Vibramycin group, and especially, in two girls, rashes like as inflammatory papules and pustules was reappeared. 3. When Vibramycin was administered another 3 weeks in addition, to those whom the effectiveness was insufficient in spite of 4 week-treatment, it had showed significantly beneficial effect.

구연산을 첨가한 오디 설기떡의 품질 특성

홍정희,안상희,김미지,박금순,최상원,이순재 한국조리과학회 2003 한국식품조리과학회지 Vol.19 No.6

This study was carried out to investigate the characteristics of mulberry fruit seolgidduk. Four percent additions of mulberry were evaluated as the most suitable concentration for seolgidduk, in order to improve the color of gum metal gray and sour smell. Therefore, in order to improve the preference, citric acid was added. The acidity of mulberry fruit seolgidduk increased and its pH decreased significantly by increasing amount of citric acid. The moisture content of mulberry fruit seolgidduk showed no significant difference between the groups with added citric acid and the control of group. The L value decreased as the citric acid concentration increased. Color a and b (Ed-define 'a' and 'b') values increased significantly by increasing the amount of citric acid. The hardness, cohesiveness, springiness, gumminess and brittleness decreased as the citric acid was added. From the sensory evaluation, mulberry fruit seolgidduk with 0.01% citric acid added was the most preferred in taste, chewiness and overall acceptability. These results indicated that mulberry fruit seologidduk with 0.01% citric acid added showed the best quality.

Ar과 H_2 혼합 플라즈마 리플로우에 의한 무플럭스 솔더 범프 플립칩 패키지 제조에 관한 연구

洪淳珉,姜春植,鄭在弼 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.10

A fluxless reflow process for solder bump flip chip package was attempted to protect environment using Ar+10%H_2 plasma. The 100 ㎛-diameter Sn-3.5 mass%Ag solder balls were bonded to 250 ㎛ pitch Cu/Ni under bump metallurgy (UBM) pads by laser ball bonding method. Then, Sn-3.5Ag solder balls were reflowed in Ar+H_2 plasma. The plasma reflow time and power conditions to show the optimum bump shear strength and shape were 40s at 100 W and 20s at 200 W. During plasma reflow, the solder bump reshaped and the crater on the top of bump disappeared. The bump shear strength increased as the Ni_3Sn_4 intetmetallic compounds formed in the initial reflow stage but began to degrease as coarse Cu-Ni-Sn ternary intermetallic compounds formed at the solder/UBM interface. As the plasma reflow time increased, the fracture mode changed from ductile fracture within the solder to the fracture at the solder/UBM interface. The off-centered bumps self-aligned to patterned UBM pads during plasma reflow.

18개월 여아에서의 아동 학대

홍강의,장경준,문형로,안동현,손세정,박순미 大韓神經精神醫學會 1988 신경정신의학 Vol.27 No.2

A child abuse case of an 18 month-old baby girl with multiple fractures is reported. A comprehensive psychiatric and pediatric diagnostic work-up was carried out, and psychodynamic and family dynamic issues were presented in detail. A therapeutic intervention by pediatric-psychiatric team was attempted, but thwarted by the lack of father's cooperation. It is suggested that child abuse should be considered a major medical social problem in Korea too.

전자상거래에 대한 부가가치세 과세상 문제점과 과세방안

홍순복,정우성 부산 외국어 대학교 2002 外大論叢 Vol.24 No.-

E-Commerce is one of the most competitive industries internationally. From the perspectives of the industrial policies, it is necessary to prepare taxation policies to activate E-Commerce in our country since it is high value-added industry in the future. This study reviews the international discussion, and taxation system that lead to economic and social changes and suggests future directions to prepare rational taxation after reviewing taxation problems based on value-added tax which has influence on international tax revenue allocation.

Caco-2 세포 단층막 투과 실험시 교반이 약물의 투과계수에 미치는 영향

홍순선,유호정,이홍,정석재,김대덕,심창구 한국약제학회 2005 Journal of Pharmaceutical Investigation Vol.35 No.2

The unstirred water layer (UWL), which has been known to exist in the boundary of the intestinal lumen and intestinal wall, often behaves as an absorption barrier especially for lipophilic drugs. The intestinal absorption of drugs is often characterized using Caco-2 cell monolayers grown on Transwell polycarbonate membranes. The permeability (Pare) of drugs across the cell monolayer might be influenced by the agitation of the donor compartment, since the width of UWL on the surface of the cell monolayer would be reduced by the agitation. In this study, the effect of agitation of the donor compartment with 60 rpm on the permeability was measured for 12 drugs with a wide range of lipophilicity and permeability. The of mannitol, tributylmethyl ammonium, cimetidine, ranitidine, hydrocortisone, benzylpenicillin and loxoprofen was not influenced by the agitation, while the P_(app) of theophylline, propranolol, YH439, phenylpropanolarnine and testosterone was increased by the agitation. There was a significant correlation between the increase of P_(app) by agitation and the lipophilicity for the compounds having P_(app) > 2 x 10^(-5) cm/sec. No correlation was observed for the difference in P_(app) by agitation and the molecular weight, or lipophilicity of the drugs. Therefore, the agitation rate of the donor compartment in the Caco-2 cell monolayer study should be carefully controlled in order to estimate Pap, reproducibly especially for iipophilic drugs.

수종 Laminate Veneer용 도재간의 색차 비교

정유경,홍순호 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.7 No.2

The shade of prosthetic materials is very important for a successful restoration esthetically harmonized with the natural tooth. the purposes of this study were to evaluate the color differences that can exist between different brands of procelain laminate veneer systems with identical shade designations and to evaluate the color variations after luting with resin cement. For this purpose, the following experiments were done:4 kinds of porcelain laminate veneer specimens were fired to the same thickness and a resin cement of the same shade was luted to each porcelain laminate veneer specimen. Afterwards, the color of each specimen was determined and analysed by the colorimeter. The results were as follows: Corresponding shades of different brands of porcelain laminate veneer systems produced significantly different colors(p<.05). Color variations were found after luting with resin cement to the porcelain laminate veneer specimens(p<.05).