Comb 형 전극구조를 갖는 AC 플라즈마 디스플레이 패널의 전기, 광학적 특성

임성규,장호정,김동수,이순석 단국대학교 1999 論文集 Vol.34 No.-

The electrical and optical characteristics of comb type AC-PDP fabricated by the screen printing method were measured. The charge-voltage (Q-V), capacitance-voltage(C-V) and current-voltage (I-V) characteristics were also measured. The Q-V curve showed the firing voltage and transferred conduction charges and wall charges. The capacitance charge due to the charge of applied voltage was also observed from the C-V curve and it was shown that the air gap could not be considered 100% shorted during the discharge. It can be concluded that the increase of the discharge space by the comb type electrode structure reduces the firing voltage and the internal physical characteristics of the AC PDP cell can be understood by measuring various electrical characteristics.

철강업체와 용접봉 제조업체에 근무하는 생산직 근로자의 직업성 요통 유병률과 관련 요인

임현술,김수근,김덕수,김두희,이종민,김양호 大韓産業醫學會 1999 대한직업환경의학회지 Vol.11 No.1

A cross-sectional study was conducted for detecting the risk factors and to propose an effective control program for occupational low back pain. The subjects were 1,665 male production workers employed at a steel factory and a welding material manufacturing factory. The data were collected by a self-reported questionnaire and a medical examination with a rehabilitation specialist for ten days in September, 1997. The contents of the questionnaire were as follows: general characteristics, physical characteristics, employment status, type of work, working environment and the experience of low back pain. The number of cases with symptoms of occupational low back pain were 321, so the point prevalence was 19.3 persons/100 persons. The number of cases with a history of occupational low back pain for one year were 554, so the one year period prevalence was 33.3 persons/100 persons. The point and one year period prevalences of occupational low back pain showed no significant differences in age, marital status, educational level and body mass index. The point and one year period prevalences of occupational low back pain showed no significant differences in alcohol drinking, smoking, stretching exercise and regular exercise. The point and one year period prevalences of occupational low back pain were significantly higher in the unsatisfied group that the satisfied group (p<0.01). However, no significant differences were found among tenures and shift work. The point and one year period prevalences of occupational low back pain were significantly higher in the lifting of heavy materials group than the nonlifting group(p<0.01). However, no significant differences were found among posture of the waist and the working posture. Through the multivariate logistic regression, significantly associated factors with occupational low back pain were found to be dissatisfaction with job (point prevalence: OR=1.78, 95% CI: 1.21-2.61: one year prevalence : OR=1.76, 95% CI: 1.26-2.47), lifting of heavy materials(point prevalence OR=1.94 95% CI : 1.44-2.61; one year prevalence: OR=2.17, 95% CI : 1.70-2.77) and tenure (point prevalence : OR=1.03, 95% CI : 1.01-1.06; one year prevalence : OR=1.02, 95% CI : 1.00-1.05).

3-D 동작 분석 장치를 이용한 한국성인(20대, 30대)의 동작 범위에 관한 연구

임현균,김진호,박수찬,류신아,이영신 한국운동역학회 1998 한국운동역학회지 Vol.8 No.2

Devices, such as a goniometer, have been used to measure a human being's active range of motion, but interferences between subjects and testers have affected the result precision. In this study, 56 dynamic motion ranges were measured using a 3-D motion analysis system which is quite accurate (2mm error for 1m). The 3-D motion analysis system consists of VICON 140, data acquisition system, and data analysis program (KRISSMAS). 80 Korean subjects (40 males, 28±6.1 aged and 40 females, 28.4±6.9 aged) participated. Subjects were divided into 4 groups by Ro¨hrer's index based on National Anthropometric Survey of Korea 1997. Basic statistical analysis were performed using SPSS (ver. 8.0) programs after refining data. Various comparisons were performed for the right and left side, male and female, age groups (20's, 30's. and 40's-60's) using previous studies. The results show that female subjects have more flexible joints in the neck, hip, ankle, and wrist, while male subjects have more flexibility in their waist. But most of the significances were not high (>0.05). The prediction that the right side of Korean bodies would be mort flexible was not a good hypothesis. And the joints flexibilities are not correlated with Ro¨hrer's Index.

어린 브리티쉬 숏헤어 고양이에서 발생한 비대성심근병증

임수정,이선희,손선호,최호정,송근호 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2008 動物醫科學硏究誌 Vol.15 No.1

A l0-month-old, neutered male, British shorthair cat was referred to the Veterinary Medical Teaching Hospital of Chungnam National University with the history of tachypnea, anorexia and depression which onset were two days ago. On physical examination, increased respiratory rate and no murmur were found. A complete blood count indicated thrombocytosis. Results from a serum biochemical profile demonstrated elevations in CK, ALP, BUN and Ca, and decreases in sodium, potassium and chloride. Thoracic radiographs revealed patchy interstitial opacity increase and left atrium enlargement. Echocardiographs showed the evidences of hypertrophic cardiomyopathy which were hypertrophy of diastolic interventricular septum and left ventricular free wall. Other findings on echocardiography were the reverse E:A ratio(tranmitra1 inflow pattern) and absence of systolic anterior motion of mitral valve. Electrocardiographs demonstrated wide P and R wave, which mean left atrium enlargement and left bundle branch block, respectively. Medications including furosemide (2mg/kg), enalapril (0.25mg/kg), and spironolactone (1mg/kg) were prescribed twice a day and orally. Client education about exercise restriction and possibility of aggressive progress was given. Clinical signs suggestive of thromboembolism were developed on 6th day after showing tachypnea; right forelimb lameness, bilateral hindlimb lameness, loss of femoral pulse and severe pain. After all, euthanasia was performed at local animal hospital, according to the owner's request.

디젤분진이 사람 동맥 평활근 세포(VSMC)에 미치는 영향

임용,김수연,정규혁,정진호,문창규,윤여표 한국환경독성학회 2004 환경독성보건학회지 Vol.19 No.1

The purpose of the present study was to examine the effect of diesel exhaust particles on human aortic vascular smooth muscle cells(VSMCs). DNA synthesis, cell viability and morphology of VSMCs after treatment of diesel exhaust particles(DEP) and fine particulate matter(PM_(2.5)) were assayed. PM_(2.5) inhibited the DNA synthesis of VSMCs in a concentration-dependent manner, whereas DEP did not affect VSMCs up to 50㎍/mL . These results were confirmed by morphological examination of VSMCs. PM_(2.5) showed a dose-dependent cytotoxicity of VSMCs by MTT assay. Fraction 4(organic acids) and fraction8(moderately polar compounds) showed the most potent inhibition of DNA synthesis of VSMCs, and fraction7(slightly polar compounds), fraction9(higher polar compounds), and fraction6(aromatic compounds) were next order. These results were confirmed by morphological examination of VSMCs. These results suggest that PM_(2.5) inhibits the DAN synthesis of VSMCs through the cytotoxicity.

위암에서 근치적 절제술 후 전이 림프절 수가 예후에 미치는 영향

임호영,최진혁,김현수,남동기,김효철 아주대학교 의과학연구소 1998 아주의학 Vol.3 No.1

Gastric cancer is the most common cause of cancer death in Korea, and the most important prognostic factor for patients with gastric cancer is the extent of TNM stage. Among TNM staging system, lymph node involvement (N) has been recognized as one of the significant prognostic indicators after curative resection. Recently, nodal stage of new AJCC TNM staging system has changed its emphasis on the location of metastatic lymph nodes to the number of metastatic lymph nodes. Thus, we attempted to analyze the survival difference based on the number of metastatic lymph nodes after curative resection of gastric cancer. Two hundred and forty two patients of curatively resected gastric cancer were retrospectively studied to identify the number of metastatic lymph nodes to influence prognosis. The following results were obtained. The results showed that there was a significant difference in the survival rate between the patients with 0-2 metastatic lymph nodes and those with ≥3 metastatic lymph nodes in adjuvant chemotherapy (FA) group (DFS; 36.7% vs. 23.4%, OS; 38.3% vs. 26.0%). In adjuvant chemoimmunotherapy (FA+poly-AU) group, there was a significant difference in the overall survival between the patients with 0∼2 metastatic lymph nodes and those with ≥ 3 metastatic lymph nodes(70.1% vs. 47.4%). The present report demonstrates the prognostic importance of the number of metastatic lymph nodes in gastric cancer after curative resection and a necessity of further evaluation of current nodal stage.

공동주택 주호 내부구성재의 내용연한 및 수선주기 설정연구

임석호,황은경,이강희,김수암 대한건축학회 2003 대한건축학회논문집 Vol.19 No.3

In case of an apartment house, the application of LC(Life Circle) design that considers remodeling and reconstruction when the a house reaches a certain time after its erection needs to be reviewed for longevity from time series life perspectives that set up a period of durability for components and maintains and improves their performances through systematic replacement and repair. Apartment houses are constructed with parts of different sizes and life. It is important to manufacture materials and components with high durability. However, more importantly, well-thought-out and systematic plans are needed between parts with a space module and a life module and construction space. Hence, this research sought to investigation of the expected service life of parts or members according to repair or replacement cycles with social and functional aspects, considering the establishment of housing parts hierarchy through the analysis of expected service life. Consequently, the establishment of the repair cycle and estimation of the service life of housing parts have the remodeling in place in the frontline construction business and cut cost on remodeling, thus activating remodeling.

치과용 산부식제로서 피루빈산의 효용성에 관한 연구

임호남,박영국,이기수 대한치과기재학회 1996 대한치과재료학회지 Vol.23 No.1

Although the phosphoric acid etching method are using widely for the bonding between enamel and resin, problems such as demineralization, depth of etch, softening are reported. Evaluations of etching efficacy of other acids are necessary to improve it. The purpose of this study was an evaluation of the possibility of substitution of pyruvic acid for phosphoric acid. Aqueous solutions of pyruvic and phosphoric acid with 5%, 10%, 20%, 40%, 60%, 85% concentration were prepared and used as etchants on bovine enamel surface. 11 experimental groups were planned including 0% distilled water, a control group was 40% phosphoric acid solution. Shear bond strength between etched enamel and an experimental BIS-GMA composite resin were measured using Instron, surface roughness and depth of etch were measured using profilometer, and surface topography were observed using SEM. 1. A concentration of pyruvic acid groups which showed the highest shear bond strength and surface roughness, and the significant irregular surface was 20%. 2. Shear bond strength of 20% pyruvic acid group was same with it of 40% phosphoric acid group, however values of surface roughness and depth of etch were smaller than those of 40% phosphoric acid group. 3. Depth of etch of phosphoric acid groups were increased until to 40% group and then it was decreased, depth of etch of pyruvic acid groups were increased with the rise of concentration. Pyruvic acid could be considered as a substitute etchant for phosphoric acid with same bond strength and smaller surface roughness and depth of etch, and its optimal concentration was assumed smaller than 20%.

산부식된 법랑질의 재석회화 조건에 따른 특성 변화에 관한 연구 : NaF와 SnF₂의 농도효과 Effect of the concentration of NaF and SnF₂

임호남,이기수 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.1

Enamel acid etching technique with phosphoric acid have been used for the bonding of the resinous materials to enamel. Etching the enamel with phosphoric acid forms the irregular enamel surface which is suitable for the mechanical adhesion, but the problems such as depth of etch, decalcification, increase of caries-sensitivity, and softening. Remineralization of etched enamel should be emphasized, and the typical remineralizing agent could be fluorides. The purpose of this study were to confirm the degree of recover of micro Vicker's Hardness Number of acid-etched enamel by the process of remineralization using NaF and SnF₂, and to observe the fluoride adsortion to acid etched enamel and the morphology of remineralized enamel surface with fluorides. Tooth were premolar extracted for the orthodontic treatment, etchant was a 37%-phosphoric acid solution, and fluoride containing remineralizing solutions were NaF and SnF₂aqueous solutions with the concentrations of 0.25%, 0.5%, 1.0%, 1.5%, 2.0%. Buccal surface enamels were flattened in resin block. A control group, an acid-etched group, and 10 remineralized experimental groups after acid-etching were designed. Remineralizing durations were 72 hours. Surface hardness were measured by the mocro Vicker's Hardness Tester. After the experiments of surface hardness, two groups from NaF and SnF₂with the highest VHN values were selected. For the control group, the acid-etched group, and two selected groups, the measurement of the cross-sectional hardness from outer surface into inner side and the fluoride adsorption amount onto enamel, and the observation of morphology were done on scanning electron microscope. The following conclusions could be drawn : 1. Hardness of enamel were decreased on half level after the acid-etching. 2. Lowered hardness values of acid-etched group were increased by the immersion into fluoride containing remineralization solution, and NaF was more effective that SnF₂. 3. NaF 2.0% remineralizing solution recovered the lowered hardness to 84.4%. 4. Increase pattern of hardness on cross-sectioned enamel were excellant on NaF. 5. Amount of fluoride adsorption onto enamel ware larger on NaF group than SnF₂ group, it filled the irregular surface formed by etching, and its micro shapes were spherical.

신경행동학적 증상 설문지의 타당도 및 신뢰도에 관한 연구

권호장,조수헌,임현술 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.1

유기용제 폭로에 의한 신경행동학적 장애를 선별 검사 할 수 있도록 고안된 설문지의 타당도와 신뢰도를 검정할 목적으로 유기용제를 사용하는 페인트 제조공장과 유기용제를 전혀 사용하지 않는 코일제조 공장의 근로자를 대상으로 2차에 걸쳐 설문조사를 실시하여 다음과 같은 결과를 얻었다. 1. 유기용제 폭로 근로자들이 비폭로 근로자들에 비해 증상총점의 평균이 통계적으로 유의하게 높았으며 이 결과는 나이, 근무기간, 교육연한, 음주, 흡연 등의 교란 요인을 통제하고도 유지되었다. 2. 신뢰도를 보기 위하여 페인트제조공장 근로자를 대상으로 2개월 간격으로 시행한 검사-재검사에서 문항별 kappa값은 0.15-0.69의 범위안에 있었으며 0,4이상으로 비교적 일치도가 높은 문항은 31문항 중 16문항이었다. 3. 검사문항간에 내적 일치도를 보기 위하여 Cronbach Alpha계수를 구한 결과 분포를 표준화하기 이전에는 0.85, 분포를 표준화한 이후에는 0.86의 값을 보였다. 이상의 결과를 볼 때 본 연구에 사용된 설문지는 유기용제 폭로로 인한 신경행동학적 장애를 비교적 잘 반영하고 있으며 신뢰도도 비교적 높은 것으로 판단되었다. There are many studies on the neurobehavioral symptoms due to organic solvent exposure using questionnaire. However there is little published evidence on validity and reliability of the questionnaire on the neurobehavioral symptoms. In present study, the authors tested the validity and reliability of our questionnaire, which was designed for screening neurobehavioral disturbance in organic solvent exposer. Questionnaire was administered to the workers of one paint manufacturing plant and one coil manufacturing plant. In order to evaluate validity of the questionnaire, the average questionnaire scores of two plants were compared. The average score of paint manufacturing plant were higher than that of coil manufacturing plant and the difference was statistically significant. After adjustment of age, duration of employment, education, smoking history and alcohol consumption, significance was maintained. Test-retest reliability was evaluated by kappa statistics. More than 50% of question items showed values of kappa above 0.4. Cronbach coefficient alpha which reflects internal consistency of the questionnaire was 0.86. Overall the data showed that validity and reliability of the questionnaire were generally acceptable.