HIV 감염/AIDS을 처음 진단받은 환자들의 특성과 임상에서 보편적인 HIV 검진의 가치

김종화,김태형,추은주,전민혁,서성우,이용관,최문한 순천향의학연구소 2008 Journal of Soonchunhyang Medical Science Vol.14 No.2

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스테레오 카메라의 거리오차 보정을 위한 새로운 화소간격 파라미터 교정기법

金棕晩,金炯奭,金聖中 全北大學校 1996 論文集 Vol.42 No.-

In this paper, new calibration technique of the maladjusted stereo cameras using calibrated pixel distance parameter is proposed. The camera calibration in stereo vision systems is a necessary procedure for correct depth computation. Intra and extra parameters should be obtain to determine the relation between image and 3-dimensional world coordination through calibration experiment. One difficulty is in camera alignment for parallel installation: placing two CCD arrays in a plane. No effective methods for such alignment have been proposed till now. Some amount of depth error caused from such non-parallel installation of cameras is inevitable. If the pixel distance parameter which is one of intra parameter is calibrated with known points, such error can be compensated in some amount. Such error compensation effects with calibration technique of the calibrated pixel distance parameter are demonstrated with some experiments and as a results, the effects of the proposed method that used compensated parameters is three times better than that of uncompensed parameter methods.

울산 삼산지역의 대기질예측 및 오염저감대책

이종형,류병로 大田工業大學 1992 한밭대학교 논문집 Vol.9 No.2

This study was performed to delineate the present air pollution level in the Saman region of Ulsan, to investigate the environmental effects, and to find the measures of attaining the clean environmental in the Samsan region. The observed concentrations of Sulfur dioxide are 7.1~43.8 ppb at all sites. These values are lower than those of the current air quality standards, 50 ppb. The date also shows that the observed concentrations of hydrogen fluoride are 2.2~4. 4ppb. The simulated concentrations of hydrogen fluoride in 1994 and 1995 belong to enforced environmental standard will be reduce to 0.3 and 0.13 times each than the those of 1991. From the plants tolerance test, the tolerant trees to air pollution in Ulsan industrial estate are recommanded to attain the more clean air.

電氣機器의 絶緣試驗에 對한 考察

李鍾夏,李衡載 忠州大學校 1967 한국교통대학교 논문집 Vol.1 No.-

전문대학교직원의 여가활동참여와 조직전념도의 관계

김형룡,김정묵 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4

The purpose of this study is to investigate the relationship between leisure activity and organization commitment, Firstly, the difference of organization commitment of the participation yes or no leisure activity, Secondly, the influence of participant degree of leisure activity on organization commitment. The subjects of this study was selected by stratified cluster random sampling of involvement(male 215, female 205) in employees', The survey questionnaires were used to collect the data. The questionnaire for the formalization factor of organization commitment by Choi(1996) The statistical methods such as analysis of covariance, multiple classification analysis were used to analyze the collected data. From the analyses of the data, the study reached the following conclusions: Firstly, organization commitment different leisure activity participant character, That is, all of sub-factors of organization commitment is high leisure activity participant than non-participant. Secondly, participant degree of the leisure activity are influence on organization commitment.

자율분산 신경망을 이용한 지형정보 압축저장

崔鍾洙,金棕晩,金炯奭,金聖中 全北大學校 1994 論文集 Vol.38 No.-

A new neural network structure called Self-Organized Distributed Networks (SODN) is proposed for developing the neural network-based multi-dimensional system models. The learning with the proposed networks is fast and precise. Such properties are caused from the local learning mechanism. The SODN is a hybrid structure of a learning network and a distribution network. The learning network is composed of a set of subnetworks while the distribution network composed of a set of self-organized units. With this structure, the SODN provides a better interpolation than the conventional locally distributed networks (especially RBF networks). In this paper, comparisons with multilayer neural network and RBF networks have been done through learning of two dimensional terrain elevation data.

흰쥐 내후야의 아미노산 함량에 대한 복측 또는 배측 뇌 해마 제거 영향

최석형,김종규,양훈모,민영기 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.2

This study was planned to analyze amino acids in the entorhinal cortex of dorsal and ventral hippocampectomized rats by high performance liquid chromatography (HPLC). Male albino rats were used. Under chloral hydrate anesthesia (20%, 2 ㎖/㎏ body weight), a hole was made in each parietal bone about 4 mm lateral to the sagittal suture, and 4 mm rostral to the lambda suture. The cortical tissue on each side was removed and, through this opening, the hippocampal tissue anterodorsal and posteroventral to the hippocampal flexures on both sides was removed by aspiration. This preparation served as the dorsal and the ventral hippocampal animals, respectively. The cortical control animal received the same surgery short of hippocampectomy. The normal rats served as normal control animal. One week later, the animals were sacrificed by decapitation in the cold room. Two to three milligrams of tissue was obtained from the entorhinal cortex in one side of the brain. The tissue samples were homogenized and centrifuged. Then content of each amino acid was measured by HPLC from the brain tissue. 1) The contents of aspartate were decreased significantly more in the dorsal and ventral hippocampal groups than in the normal and the cortical control groups, while there were no significant differences between the 2 hippocampal and 2 control groups. 2) The contents of glutamate were decreased significantly more in the dorsal hippocampal group than in the normal and the cortical control groups. The contents of glutamate were increased significantly more in the ventral hippocampal group than in the dorsal hippocampal, the normal control, and cortical control groups. while there was no significant difference between the 2 control groups. It is inferred from the above mentioned results that glutamate and aspartate of many amino acids may he used as a excitatory transmitter in entorhinal cortex, and that the dorsal hippocampus may be facilitatory to the entorhinal cortex, but the ventral hippocampus would be inhibitory/facilitatory to the cortex.

일부 조선업 근로자의 직업성 요통 발생실태 및 위험요인에 관한 연구

고상백,김형식,최홍렬,김지희,송인혁,박준한,박종구,장세진,차봉석 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.1

목적 : 이 연구에서는 한 사업장의 동일한 코호트내에서 직업성 요통의 발생 및 발생원인에 대해 조사하고자 하였다. 방법 : 연구대상은 1995년 12월 현재 한 조선업체에 종사하는 근로자 중에서 1995년 12월 31일 까지 요통이 이미 발생한 근로자와 1995년 당시 검진 미수검자를 제외한 9,784명을 연구대상으로 하였다. 요통 발생군은 1996년부터 1998년까지 3년간 추적 관찰하여 요통으로 4일 이상 통원 또는 입원치료를 받은 근로자로 하였다. 발생률은 요통발생 당시 연도를 기준으로 하여 해당 연도의 4일 이상 신규치료를 받은 중등도 이상의 요통근로자를 분자로 하였고, 해당년도 사업장의 종사하는 근로자 총수(과거 요통자 제외)를 분모로 간주하였다. 요통 발생군은 외상성 요통과 직업관련성 요통으로 대별하였으며, 위험요인과 질병 발생간의 관련성을 보기 위한 Cox모형에서 그 위험도를 파악하고자 할 때에는 직업성 요통만을 환자군으로 선정하였다. 결과 및 결론 . 요통 발생률은 근로자 천명당 1998년 3.1명, 1997년 8.8명, 1996년 7.8명이었다. 요통점유율의 범위는 10.99∼25.66이었다. 연령별 요통 발생률은 30대, 40대에서 높은 발생률을 보였다. 진단명에 따른 발생률은 추간판 탈출증, 염좌, 척추골절, 척추분리증, 척추협착증 순이었다 직업성 요통 발생자들의 직업적 요인을 알아보기 위하여 요통 발생 당시 작업형태를 알아본 결과, 물건을 들다가 66명(35.3%)이 발생하여 가장 큰 빈도를 차지하였고, 물건을 옮기는 과정에서 19명(10.2%)이 발생하여 2위를 차지하였고, 넘어지거나(8.6%), 물건을 당기는 자세(8.0%), 값자기 일어서다(7.5%) 순으로 요통이 발생하였다. 직업성 요통에 영향을 주는 일반적 특성 및 직업적 특성에 판한 상대위험도 및 95% 신뢰구간를 구한 결과, 요통발생에 영향을 주는 유의한 변수로는 체질량 지수(비만도), 교대여부, 중량물 취급여부였다. Objectives : This study was conducted to estimate the incidence rate, and to identify the risk factors for the occupational low back pain among shipyard workers. Methods : The study subjects consisted of 9,784 workers who were employed in a ship-building industry (excluded workers who had a history of low pack pain before 1995 or did not take periodic health examination in 1995) . The cases were 220 people who experienced back pain from January 1, 1996 to December 31, 1998. To assess risk factors for occupational low back pain, Cox propotional hazard model was used. Results : During the recent three years from 1996 to 1998, the incidence rate per 1,000 persons was 7.8 in 1996, 8.8 in 1997, and 3.1 in 1998. The main causes of work-related low back pawn were sprain, strain and disc herniation. Lifting was the most common cause of back pain (35.3%) , and carrying (10.2%) and pulling (8.0%) were followed. In Cox proportional harzard model, independent risk factors for back pain were body mass index(R.R. ; 1.54, 95% C.1. : 1.06-2.25), shift work(R.R. ; 1.65, 95% C.1. : 1.19-2.28), and lifting heavy material(R. R., 3.95, 95% C.1. : 2.29-6.82). Conclusions . This study suggests that the risk factors of back pawn In shipyard work-ers were body mass index, shift work and lifting.

열공성 뇌경색과 뇌내출혈의 위험인자 비교

이장준,이현아,최종환,이형,임정근,이상도,박영춘 계명대학교 의과학연구소 2000 계명의대학술지 Vol.19 No.2

Cerebral small vessel disease is the most important cause of lacunar infarction (LI) and intracerebral hemorrhage (ICH). It is generally postulated that, in its early stages, the vascular lesion engenders vessel wall fragility and ICH. But if rupture dose not occur, segmental vessel occlusion evolves, producing LI. It may be a common aging phenomenon that is exacerbated by hypertension and diabetes mellitus. This study was performed to evaluate risk factors of LI and ICH. We reviewed retrospectively the medical records of 690 patients (254 LI, 436 ICH) with stroke who were admitted to Keimyung University Dongsan Medical Center from January 1995 to December 1998. The major risk factors including age, sex, hypertension, diabetes mellitus and several minor risk factors were analyzed in these patients. Older age (p<0.01), male sex(p<0.01), hypertension with treatment(p<0.01), hypertension with long duration(p<0.01) and hypertriglyceridemia(p<0.01), cigarette smoking(p<0.01) were significantly more frequent in LI. Younger age(p<0.01), female sex(p<0.01) and hypertension without treatment(p<0.01), hypertension with short duration(p<0.01) were more frequent in ICH. The prevalence, duration and treatment of diabetes mellitus were not different between these two groups. This study show that the age, sex, treatment of hypertension, duration of hypertension and cigarette smoking seem to be significant risk factors between LI and ICH.

라텍스 개질 콘크리트의 강도발현 및 내구특성

윤경구,홍창우,이주형,이종명 강원대학교 석재복합신소재제품연구센터 2001 석재연 논문집 Vol.6 No.-

본 연구는 라텍스 혼입률이 5%, 10%, 15%, 20%로 변화할 때 라텍스 개질 콘크리트의 내구 특성을 평가하는데 있다. 라텍스를 콘크리트에 혼입한 라텍스 개질 콘크리트는 보통 콘크리트의 색상과 성형성, 작업성를 갖으며, 약 20%~35%의 단위수향이 감소된다. 그리고 양생후, 콘크리트는 시멘트수화물과 라텍스 입자의 필름막에 의해 연결된 골재로 구성된다. 일반적으로 라텍스 양이 증가하면 콘크리트의 휨강도는 증가하는데, 이것은 라텍스가 시멘트 수화물과 골재사이의 점착력을 증가시키기 때문으로 판단된다. 라텍스 개질 콘크리트와 보통콘크리트와의 상대투수성을 측정하기 위하여 염소이온투과시험법을 사용하였다. 그 결과 라텍스 개질 콘크리트의 투수성은 보통콘크리트의 투수성보다 매우 낮음을 알 수 있었다. 이것은 라텍스가 미세공극을 충진하고 라텍스 입자의 필름막에 의해 골재와 시멘트수화물이 연결 때문이다. 또한 라텍스가 공극주위로 필름막을 형성하기 때문에 공기량이 투수성에 영향을 미치지 못한다는 것을 알 수 있었다. 보통콘크리트에서는 동결융해저항성을 증가시키기 위해 공기연행제를 필요로 하지만, 라텍스 개질 콘크리트에서는 적절한 양생이 이루어지면 추가적인 공기연행제는 요구되지 않는다. 또한 라텍스 혼입률이 증가함에 따라 추가적인 동결융해저항성의 증가는 나타나지 않았다. This study focused on the investigation of strength development and durability of latex modified concrete(LMC) as the latex content variated such as 5%, 10%, 15%, and 20%. When latex was added to concrete, the workability of LMC was quietly increased, compared to that of conventional concrete. This resulted in the decrease of the required water as 20% to 35% in order to obtain a same slump. In general, increasing the amount of latex decreased compressive strength a little but increased flexural strength quite a lot. This might be due to interconnection by a film of latex particles between hydrated cement and aggregates. This, also, might attribute to bonding between the hydrated cement and aggregates. The rapid chloride permeability test was used to evaluate the relative permeability of latex-modified concretes and conventional concretes. The results showed that the permeability of latex-modified concretes was considerably lower than that of conventional concretes tested, which might be due to the latex filled in voids and interconnections of hydrated cement and aggregates by a film of latex particles. Because of latex formed film surrounding the air void, air contents and voids does not effect to the permeability of latex modified concrete.