telescope형 및 Clasp형 유지장치를 이용한 국소의치 지지조직의 응력분포에 관한 삼차원 유한요소법적 연구

곽재영,김광남,장익태,허성주,Koak, Jai-Young,Kim, Kwang-Nam,Chang, Ik-Tae,Heo, Seong-Joo 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.1

The purpose of this study was to compare and evaluate the stress distribution and displacement developed in the abutment teeth and residual ridge area by madibular unilateral distal extension removable partial denture with 2 different retainer designs. The retainers on right and left canine and right 2nd molar were Alters clasp in one model and telescopic crown in the other model. The stress distribution of abutment teeth and residual ridge area on two model were compared and analyzed with 3-dimensional finite element method. 150N and 400N forces were applied vertically, 30 degree and horizontally on the central fossa area of left 1st molar of the removable partial denture, and then stress distribution patterns were analyzed and compared. The results were as follows 1. As the magnitude and angulation of applied force were increased, the magnitude of stress on the right and central residual ridge area and the right canine of the telescopic type increased and comparing to those of the Alters clasp type. 2. As the magnitude and angulation of applied force were increased, the mesial direction of displacement on the right residual ridge area and the right tooth of the telescopic type increased and the distal direction of displacement on left residual ridge area and the left canine increased comparing to those of Akers clasp type. 3. As the vertical force was applied, the distal direction of the displacement of the right tooth were greater and that of the left canine was smaller and the upward displacement of the right canine was greater in telescopic partial denture than those of Akers clasp type. 4. As the 30 degree force was applied, the mesial direction of the displacement of the right tooth were greater and the distal direction of the displacement of the left canine was smaller and the upward displacement of the right canine was greater in telescopic partial denture than those of Akers clasp type. In the horizontal force the results were same in right area tooth but the distal direction of displacement was greater in left canine. 5. In both removable partial dentures, as the magnitude and degree of force were increased, the stress and displacement were increased. The compressive force was dominative than the ten sile force. 6. In both removable partial dentures, the magnitude of stress was greater on mucosal tissue area than that of the alveolar bone area on distal extension residual ridge area but the result was reversed on anterior residual ridge area. The displacement was always greater on mucosal tissue area than that of alveolar bone area.

콤팩트 형광램프용 Dimming형 전자식 안정기의 회로정수 결정

곽재영,송상빈,여인선 한국조명전기설비학회 1995 조명.전기설비 Vol.9 No.2

본 논문에서는 콤팩트 형광램프용 Dimming형 전자식 안정기의 설계에 있어서, 인버터 공진탱크의 커패시턴스값을 변화시킬 때 전압이득곡선을 분석하여 최적의 회로정수를 결정하는 방법을 제안하였다. 또한 하프브리지 인버터회로의 회로정수에 대한 PSpice 시뮬레이션을 행하여 램프전압과 전류값을 구하였고, 실제 전자식 안정기를 제가하고 시동특성과 조광특성을 비교분석하였다. 시동특성은 일반 전자식 안정기와 거의 동일하였으며, 조광특성은 전체 광출력의 5%까지 안정동작되어, 제안된 방법이 뛰어남을 확인하였다.

마이크로 컨트롤러를 이용한 가변출력형 전자식 안정기의 설계 및 제어

곽재영,여인선 한국조명전기설비학회 1997 조명.전기설비 Vol.11 No.4

This paper proposes a new approach for the design of a multi-output electronic ballast for fluorescent lamps of different outputs and control method. At first, a standard-output electronic ballast is constructed and then fluorescent lamps with different outputs are lighted by the frequency control of inverter circuit using MeV. This multi-output electronic ballast consists of a rectifier circuit, an inverter circuit, and a frequency control circuit to determine the optimal frequency for the lamps of different output. In order to verify the proposed design method, a prototype of a multi-output electronic ballast for 11 [WJ. 15[WJ compact fluorescent lamps and 20W fluorescent lamp is constructed. Results of observing the voltage and current characteristics of lamps are in accord with those of PSpice simulation. Also its efficacy is nearly the same as the other electronic ballasts. From the result, therefore, validity of the proposed design method of a multi-output electronic ballast for fluorescent lamps is verified.

總輸膽管結紮이 肝 및 血淸의 脂質 및 脂蛋白質 分劃像에 미치는 影響

郭再濚,曺準承 慶北大學校 醫科大學 1983 慶北醫大誌 Vol.24 No.2

쥐의 총단관을 結紮한 後 肝 및 血淸中의 脂質과 脂蛋白質 分劃의 變動을 調査하여 다음과 같은 結果를 얻었다. 健康하고 正常 攝食을 한 쥐의 肝脂質의 正常値는 中性脂肪이 3.3±0.8㎎/g, 燐脂質이 15.9±3.5㎎/g, 그리고 cholesterol은 4.2±0.9㎎/g이었으며, 血淸脂質의 正常値는 中性脂肪이 54.1±8.5㎎/dl, 燐脂質이 102.5±19.2㎎/dl, cholesterol은 71.3±14.3㎎/dl, 그리고 遊離脂肪酸은 2.6±0.2mEq/ℓ이었다. 한편 血淸 脂蛋白質의 LDL이 170.2±37.8㎎/dl, VLDL이 30.7±9.7㎎/dl, chylomicron이 28.5±8.5㎎/dl, 그리고 HDL-cholesterol分劃이 15.2±4.2㎎/dl이었다. 단관결찰후 肝脂質中 中性脂肪과 cholesterol은 別다른 變動을 보이지 않았으나 燐脂質量은 2日째부터 계속 減少하였다. 그리고 血淸의 脂質에서는 cholesterol과 燐脂質이 다같이 增加되었으며 膽管結紮後 2日째에는 對照群에 比해 3-4倍나 높았다. 中性脂肪도 완만하게 增加되어 2日째에 約 1.8倍로 높은 最高値를 보였다. 그러나 遊離 脂肪酸의 濃度는 變動하지 않았다. 血淸 脂蛋白質分劃의 단관결찰후의 變動에 있어 VLDL과 chylomicron은 다같이 增加하여 2日째에는 對照群에 比해 約 10∼11倍나 높은 最高値에 達한 後도 계속 높은 値를 나타내었으며, LDL의 增加는 완만하여 最高値는 2倍가량 높았다. 이에 反하여 HDL-cholesterol 分劃은 漸次 減少되어 2日째에 約 3分의 1에 해당되는 最高値를 보인 後 계속 낮은 값을 維持하였다. 이와 같이 단관결찰로 急性 단즙형체를 惹起시키면 血淸의 脂質分劃이나 脂蛋白質分劃에 顯著한 變化를 일으키나 肝脂質에는 燐脂質 以外는 別다른 變動을 나타내지 않았다. The concentration of lipids and lipoprotein fractions in the liver and serum after common bile duct(C.B.D.) ligation was investigated in albino rats weighting approximately 200 gm. The rats were sacrified after 6, 12, 24, 48, 72 and 144 hours following the C.B.D. ligation. Serum and liver samples of each group were analyzed to determine the concentration of lipids and liporotein fractions. In the liver lipids after B.B.D. ligation, the concentration of triacylglycerol and cholesterol showed no significant change, but phosholipid levels gradually decreased from the 2nd day of C.B.D. ligation. In serum lipids after C.B.D. ligation, the concentration of cholesterol and phospholipid showed a marked increase and reach the peak at the 48th hour of C.B.D. ligation(3-4 times the control). Triacylglycerol concentration also made a gradual increase and reached its peak at the 48th hour of C.B.D. ligation (1.8 times the control). But no change was found in the concentration of free fatty acid. In serum lipoprotein fractions, VLDL and chylomicron were markedly increased to reach their highest levels at the 48th hour of C.B.D. ligation (10-11 times the control), and maintained a slow decline until the 144th hour of C.B.D. ligation. LDL level gradually increased and peaked at the 48th hour of C.B.D. ligation(2 times the control). Contrary to above lipoprotein fractions, HDL-cholesterol fraction gradually decreased and revealed the lowest level at the 48th hour of C.B.D. ligation (approximately one third of the control) and remained lower than the control. The abovee results indicats that lipid and lipoprotein fractions in serum after C.B.D. ligation go through noticeeble changes, without significant changes in liver lipid except for phospholipid.

전치부 개교환자의 하악 운동에 관한 연구

곽재영,김광남,장익태,Koak Jai-Young,Kim Kwang-Nam,Chang Ik-Tae 대한치과보철학회 1994 대한치과보철학회지 Vol.32 No.2

It is very important for the ideal restorations of anterior openbite patients to record the mandibular movement and to harmonize mandibular movement with other organs in stomatognathic systems. This study was designed to compare the mandibular movement of anterior openbite patients with that of normal bite(Angle Class I) patients, to ascertain which components of mandibular movement have differences between two groups, and to use for occlusal treatment of mandibular movement. Saphon Visi-trainer Model 3(Tokyo Shizaisha Co. Japan) and Denar Pantronic(Denar Corp.,U.S.A.) were used to record mandibular movement. Pantronic survey was peformed by using an arbitrary hinge axis according to manufacturer's direction. Twenty-eight adult who have physiologically normal occlusion(Angle Class I) and are free of TM dysfunction were selected as a control group(Group 1). Fifteen adult who are anterior openbite patient and have not anterior guidance function and have posterior interference at protrusion were selected as a experimental group(Group 2). The results are as follows : 1. There was no statistically significant difference between the average immediate and progressive side shift of anterior openbite patients(0.54mm, $7.57^{\circ}$) and those of normal group(0.49mm, $5.96^{\circ}$). 2. The average protrusive and orbiting condylar inclination of anterior openbite patient$(30.87^{\circ},\;32.27^{\circ})$ were significantly lower than those of normal group$(36.11^{\circ},\;39.04^{\circ})$ (P<0.05). 3. In the results of Visi-trainer recordings, the mean for the maximum protrusion, the maximum laterotrusion, the angle of laterotrusion and the angle of protrusion in the horizontal trajectory between group 1 and 2 did not differ significantly. 4. The mean for the angle of protrusion, the maximum opening in the frontal trajectory, the ICP-RCP(A-P) distance and the angle of protrusion in the sagittal trajectory differ significantly(P<0.05). 5. The significant correlation was found between orbiting condylar inclination and protrusive condylar inclination.

DLC 표면 처리에 따른 임플랜트 지대주 나사의 풀림 현상에 관한 연구

곽재영,허성주,장익태,임순호,이종엽,이광렬,Koak Jai-Young,Heo Seong-Joo,Chang Ik-Tae,Yim Soon-Ho,Lee Jong-Yeop,Lee Kwang-Ryeol 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.2

Statement of problem : Implant screw loosening remains a problem in implant prosthodontics. Some abutment screws with treated surfaces were introduced to prevent screw loosening and to increase preload. DLC(Diamond Like Carbon) film has similar properties on hardness, wear resistance, chemical stability, biocompatibility as real diamond materials. Purpose : The purpose of this study was to investigate the effect of lubricant layer on abutment screw and to discriminate more effective method between soft lubricant and hard lubricant to prevent screw loosening. Material and method : In this study, $1{\mu}m$ thickness DLC was used as protective, lubricating layer of titanium screws and 3 times removal torque was measured on the abutment screws to investigate the difference in 10 coated and 10 non-coated abutment screws. Results : The results indicated that the implants with DLC coating group were not more resistant to the applied force in screw loosening. At 32Ncm, the 3 times removal torque in DLC group were $27.75{\pm}2.89,\;25.85{\pm}2.35$ and $26.2{\pm}2.57$. The removal torque in no-coated abutment screws were $27.85{\pm}4.23,\;27.35{\pm}2.81$ and $27.9{\pm}2.31$, respectively. Conclusion : The lubricant layer used in this study was Diamond Like Carbon(DLC) and it have a properties of hard and stable layer. The DLC coating layer was hard enough to prevent distortion of screws in the repeated unscrewing procedure in clinical situation. The reduced friction coefficient in hard DLC layer was not effective to prevent screw loosening.

페이스북 공감 리액션 인터페이스 디자인의 적합성 평가: 국내사용자 중심으로

곽재영,이주환 한국지식정보기술학회 2016 한국지식정보기술학회 논문지 Vol.11 No.5

The major social networking service 'Facebook' enabled empathic expressions for communication through the 'Like' button as well as it expanded expressions between people online and offline. As of late, Facebook has launched the new interfaces for empathic reactions in order to enrich empathic communication. Empathic reactions refer to the Emoji interface which is made up of letters and images that signify emotions. In the present study, empirical investigation for usage behaviors and suitability of empathetic reactions based on Facebook's design principle was implemented and the results were analyzed to see if domestic Facebook-users are able to display enriched empathic expressions. The results showed first it to be possible to clearly distinguish emotions as particular emotions. Second, for the concern of difficulty understanding a certain emotion due to inappropriately expressed animation effects of emotion responses, the results showed the animation effect of 'Wow' reaction was an inappropriate emotion. Third, in understanding the suitability of emotion labels for images that display applicable emotions, the results showed 'Love' and 'Wow' reactions were not accepted as suitable emotion labels. These results are meaningful in a way that they provide grounds for design directions to improve towards the empathic reaction interface, which is optimized for the domestic Facebook users' emotions based on regional emotion expression attributes.

제30차 학술대회 : 46. 대장 및 직장암의 임상적 고찰

곽재영,박성대,박영관 () 대한외과학회 1978 대한외과학회 학술대회자료집 Vol.- No.-

다중 조명 영상 개선 방법을 이용한 향상된 유리용기 파손 검출 시스템

곽재영,박상호,백광렬 한국정보기술학회 2024 한국정보기술학회논문지 Vol.22 No.1

유리용기는 특유의 물성을 가지기에 현대 산업에 많이 사용되며, 생활의 한 부분을 차지하고 있다. 또한, 유리 고유의 특성 덕분에 다양한 산업 환경에서 시료를 가공할 때 사용되고 있다. 그러나 외부에서 가해지는 충격으로 유리용기 일부가 파손되거나 유리용기 표면에 균열이 생기는 단점이 있다. 자동화 검출을 통해 파손을 감지하고 지속적인 문제를 해결하기 위한 기존 단일조명의 유리용기 파손 검출 알고리즘이 여럿 존재한다. 하지만 유리용기 내부의 시료와 이물질로 인해 파손 검출 정확도가 떨어지는 단점이 있다. 본 논문에서는 유리용기 내부의 시료나 이물질로 인한 파손 오 검출 및 미 검출률을 줄이기 위해 다중조명을 이용한 영상 개선 방법을 제안한다. 또한, 제안한 방법으로 파손 검출 시스템을 구현하고, 제안하는 방법과 기존 방법들의 RMSE 평균값을 통해 성능을 비교하여 검증한다. 제안한 유리용기 파손검출 시스템은 기존 방법들과 비교하여 파손 검출 정확도가 향상되었다. Glass bottles are integral to modern industry due to their unique properties. Additionally, they are commonly used for processing sample in various industries due to the inherent properties. But glass bottles are susceptible to breakage and surface cracks from external impacts. Several existing algorithms for glass bottle defect detection using single light to detect breakage through automated inspection and address persistent issues. Still, there is disadvantage in detection accuracy of damage due to samples and contaminants inside the glass bottle. This paper introduces an image enhancement technique using multiple lights to reduce false and missed detections in glass bottles. In addition, the defect detection system of the proposed method was implemented and verify performance by comparing the RMSE average value of the proposed method and existing methods. The proposed glass bottle defect detection system has improved detection accuracy compared to existing methods.

대장 및 직장암의 임상적 고찰

곽재영,박성대,박영관 계명대학교 醫科大學 外科學敎室同門會 1990 남경 박영관 교수 정년퇴임기념 논문집 Vol.S No.-

Since early diagnosis is essential to improve the cure rate for large bowel cancer, a mass screening approach, therefore, is needed for asymptomatic patient, The only practical mass screening method available at present is testing of stoole for blood by Hemoccult slides in patients prepared by high bulk meat free diet. Those found to have occult blood positive are the subjected to diagnostic procedures. suf. ficient to rule out cancer. This paper is a clinical analysis .and review of 138 cases of colon and rectaal cancer who were admitted to Taegu Presbyterian Medical Center from June, 1968. to May, 1978. The results were as fo11ow: 1) The ratio between male and female was 1. 42 : 1 and age incidence was most prevalent in the 6th decades, comprising 32.6% of cases. 2) Location of tumor was most frequent in the rectum, sigmoid colon beingnext. 3) Most frequent sympton was bloody tarry stool, fo11owed by bowel habit change(49.3%) and abdominal pain(46.4%). 4) 44.2% of a11 patients came to hospital (within 3 months) hitory of illnes3. 5) The diagnostic accuracy of colon cancer was 18.7% by sigmoidoscopy and 99.4% by barium enema. 6) The diag-nostic accuracy of rectal cancer was 100% by sigmoidoscopy and 82.6% by barium enema. 7) The most prevalent blood type was type A(38. 6%). 8) The tumors were Dukes' classification A in 2.66%, B, 31. 9%, C, 29.2% and D, 36.3%. 9) The hemorrhoid was the most frequent associated disease in the colorectal cancer patients. 10) Miles’ operation was most frequent operation used(38.9%), and colostomy was perfo-rmed in 19.5 % of cases. 11) The most common type of cancer was adenocarcinoma(96.5%) in a11 patients. 12) Complication developed in 37.3% of cases, wound infection was the most common (I4.4%), and operative mortality was 5.3%.