교각형상에 따른 국부세굴에 관한 실험적 연구

이성대,이현국,신현길,이승훈 한라대학교 2007 論文集 Vol.10 No.-

For geotechnical and economical reasons, various bridge piers have become more and more popular in bridge design. This type of pier can significantly reduce construction costs, compared to spread footer structures when sediment scour is a consideration. However, the scour mechanisms for piles are much more complex, and design of local scour depths more difficult to predict. In this Experiments of local scour around the downward tapering oblong pier with the geometrically nonlinear structurea and a series circular piers are carried out under steady clear water scour conditions. The paper presents the following research results: The scour at a series circular piers is different from that around a single pile, depending on the pile spacing. The interference effect diminishes for pile spacing L_(d)/D=3.5, depending on the pile group arrangement.

한국인에서 다변성 D12S391 유전좌의 집단유전학적 연구

이용욱,김성민,구태완,이혜린,강일호,한길로,이혜승,황적준 大韓法醫學會 1999 대한법의학회지 Vol.23 No.1

The hypervariable short tandem repeat(STR) locus D12S391 was investigated in a Korean population. A total of 14 alleles were detected by size under denaturing conditions in 517 unrelated individuals. To confirm all of the alleles detected in a Korean population, a total of 34 fragments were sequenced. Prior to allele designation, we constructed the allelic ladders containing 11 alleles sequenced in this study. Allele 18 is the most common with a frequency of 0.281 in Koreans, and one variant allele 19.3 which have been confirmed by sequencing, was detected. The observed heterozygosity, the power of discrimination (PD), and the mean exclusion chance (MEC) for the locus D12S392 is 0.781, 0.946 and 0.652 , respectively. No deviation from Hardy-Weinberg equilibrium was observed in a Korean population (p=0.557). In the 424 meioses in 105 Korean families confirmed using other 17 STR loci, no mutation was detected in locus D12S391. The STR locus D12S391system is useful both for the analysis identification and parternity.

放射線士의 勤務條件에 關한 硏究 : 光州 全南地域 放射線士 報酬를 中心으로

이성길,김영근 광주보건대학 1990 論文集 Vol.15 No.-

This study for the improvement of the working conditions of Radiological Technologicts is based on a qauestionaire reciered from 118 Radiological Technologists who are employed in medical institutions in the Kwangju and Chun-nam areas It was conducted between November 1989 March 1990. The conclusion of this study is as follows. 1. The average daily working time is almost 10 hours. (in 96.1 % of General Hospitals, 100% of Hospitals, 90.4% of Clinics) 2. Concerning holidays 92.3% of General Hospitals have 1 holiday(Rest Way) per week, 50.0% of Hospitals have 1 holidays(Rest Way) per week, 42.8% of Clinics have 1 holidays(Rest Way) per week. However 47.6% of Clinics have 1 holiday(Rest Way) every 2 week. 3. Their average duty intervals was almost within one and two per week. (in 30.8% of General Hospitals, 83.3% of Hospitals, 52.4% of Clinics) 4. Their monthly salary is higher in Hospitals and Clinics then in General Hospitals. 5. Their yearly bonus rate is General Hospitals 600∼70% (67.2%), Hospitals 400∼500%(41.6%), Clinics 100∼200%(47.5%). 6. Danger allowance is paid with the monthly salary in 80.8% of General Hospitals 25.0% of Hospitals. However in 95.2% of Clinics it is not paid entirely. 7. Their inital salary is about 300,000Won. 8. Their satisfaction of monthly salary is almost non satisfactin. 9. Their salary is raised regulary every year (in 46.1% of G. H. 50.0% of Hospitals), but it is irregulary in 71.4% of clinics. 10. Promotion system is managed in 92.3% of the G. H, in 58.3% of Hospitals. 11. Retirement allowance is assured in 98.1% of the G. H. in 66.7% of Hospitals, and in 28.6% of Clinics.

A. 高校 科學 (生物·地球科學) 및 數學科 探究學習의 評價模型 定立과 評價紙 開發

李相協,權炳奎,林在圭,孫文求,吳岱燮,楊洪準,梁承榮,姜用熙,林成圭,金正遠,金吉民,兪正在 경북대학교 과학교육연구소 1982 科學敎育硏究誌 Vol.6 No.-

Currently the evaluation of high school science and mathematics learning has been too much knowledge-centered without concerning the inquiring ability or scientific attitude. This study, therefore, was made for the purpose of establishing of evaluation model for high school science (biology and earth science) and mathematics learning and its evaluation items. In this paper, the research was done about three fields, biology, earth science and mathematics. 1. For the biology, the evaluation methods of inquiry learning were studied with the foreign references, and proper evaluation items were suggested. 2. For the earth science, after analizing 5 kinds of earth science textbook of current using in high school, essential 19 items were selected. 5 of them were tested in test group and control group, then, the results were analized. 3. For the mathematice, the teaching elements of「Set」and「Flow chart」in mathematics (Ⅰ) were selected and structured. Detailed teaching objects were established and evaluation items were introduced.

등줄쥐 연수의 Tyrosine Hydroxylase, Dopamine-β-Hydroxylase 및 Phenylethanolamine-N-Methyltransferase 면역반응신경세포

정영길,이남섭,민성기 대한해부학회 1998 Anatomy & Cell Biology Vol.31 No.3

수문지질 특성에 의한 갈수량의 변화

이길영,허재영,박승기 大田大學校 産業技術硏究所 1996 산업기술연구소 論文集 Vol.7 No.2

The regional unbalance of water quantity and the deterioration of water quality become pending problems that should be solved. Although monthly streamflow data have been used in most water resources plannings to cope with the problems, for more effective management of confined water resources the exact calculation of daily droughtflow is essential. In this study, the droughtflows at Backokpo watershed in Han River were measured from May 1993 to May 1994 and the relations between drogughtflow and the hydrogeological character of the watershed were figured out.

放射線 安全管理에 對한 調査硏究 : 全南地域을 中心으로

李成吉 광주보건대학 1985 論文集 Vol.10 No.-

This survey was carried out during the deriod of October 1, '84 to April 30, '85 covering 71 medical facilities in Chonnam Province. It was contested throughout the safety control radiation, radiation source control, radiation exposure, protective facility and image control. The results obtained are as follows; 1. What the medical facilities with x-ray units are handled by persons without licence, are 52.6% in Hospital level, 90.75% in Clinical level and 73% in Public Health center. 2. There are small tube capacity with less than tube current 100mA in 44.5% among the 157 x-ray units surveyed, and 25.4% in nonecollimators. 3. The x-ray room capacity is less than 10m2 is 38.8% in total surveyed medical institution. It is, therefore, not perfect in safety control, so it must be extensioned for prefer control. 4. The radiation shielding systems are perferable for satisfying in 22.5% and unsatisfied in 29.5%, respectively.. 5. There is no radiation exposure counter in medical facilities in 46.6%, even there is radiation exposure counter in 53.4%, though the counter are used in 35.2% only. 6. According to this survey, it is investigated that the regular data control for radiation exposure was not tested in 73.2%. Even though the radiotechnologist takes regular physical examination, the persons was tested by regular in 23.9%. 7. In case of chest indirect photoroentgraphy, the protective partitions are used in 55.9% and the lead apron are used in 15.25% only. 8. In case of daily x-ray checks, there are 87.3% inless than 100 cases, 12.7% in more than 100 case. 9. The medical facilities are checked regularly for the x-ray unit fuction in 16.9% only. 10. As the developing method, the automatic devices are 47.8% and the hand operates are 52.1%. Even though automatic system has, daily function was checked in regular 20.6% only. 11. In case of the intensifying screen, the medium speed intensifying screen is used in 28.1% and the high speed intensifying screen is used in 66.2%, reapectively. But there is only one hospital used the rare earth intensifying screen.

Digital Subtraction Angiography (DSA)시 Grid 사용유무에 따른 화상변화에 관한 연구

이성길,김승국,김영근 광주보건대학 1990 論文集 Vol.15 No.-

It has been investigated the variation of the image for using and no using the Grid at the D.S.A(Digital Subtraction Angiography) system. The result of experiment indicated that in the case of no using the Grid, (1) the irradiation dose of patient was reduced and the life of X-ray tube prolonged. (2) the variation of the contrast was not influence of using the Grid.

접촉각 측정을 통한 Alkanethiol로 표면 처리한 은 분말의 표면 특성 연구

이길재,신승일,오성근 한국공업화학회 2004 공업화학 Vol.15 No.1

은 분말을 alkanethiol로 표면 처리한 후, alkanethiol의 탄소 개수 변화에 따른 은 입자의 표면 특성변화를 접촉각 측정을 통해 연구하였다. 이때 은 입자 표면에 alkanethiol의 흡착여부를 DRIFT (diffuse reflectance infrared fourier transform) spectrum를 통해 확인하였다. 접촉각은 Washburn 식을 바탕으로 한 liquid penetration 방법으로 측정하였고, 이 측정법의 보완을 위해 분말에 압력을 가하여 원판형태로 만들어 그 표면에서 접촉각을 측정하는 sessile drop 방법을 함께 사용하였다. 그 결과 순수한 은 입자의 물에 대한 접촉각은 두 가지 방법에 대해 각각 58°, 40° 나왔고, 다양한 탄소개수(C_(4)-C_(12))의 alkanethiol로 표면 처리한 입자는 모두 90° 이상의 결과를 얻었다. 즉 alkanethiol로 처리한 은 입자의 표면이 소수성으로 변했음을 의미한다. 여기서 처리한 alkanethiol의 탄소개수가 증가할수록 접촉각은 계속 증가했으나, 접촉각의 증가 폭은 상대적으로 점차 감소하였다. Contact angles of silver powders were measured for investigation of surface properties of silver particles as changing alkyl chain length of alkanethiol. Silver powders were modified by various alkanethiol (C4∼C12). Adsorption of alkanethiol on silver particles was confirmed by DRIFT (diffuse reflectance infrared fourier transform) spectrum. Contact angles were measured by liquid penetration method based on Washbum equation and sessile drop method on tablet of compressed powder. In result. the value of contact angles on water were 53°, 40°about two method. Contact angles of surface treated particles by alkanethiol of varied alkyl chain length were larger than 90°. Because of bonding between silver and sulfur in alkanethiol, silver surface was surrounded by alkyl groups of alkanethiol. Surface properties of silver particles were increased on hydrophobicity with alkyl chain length of alkanethiol. In comparison with increase of contact angle accordingto increase of alkyl chain length of alkanethiol. the widths of increasing contact angle were relatively decreased.

레이온회사 퇴직근로자에서 이황화탄소에 의한 건강영향평가 : 직업병 인정여부에 따른 자각증상과 관련 요인 Subjective Symptoms and Related Factors According to Compensation for CS_2 Poisoning

이경재,김주자,최현림,양길승,김호,임상혁,이윤근 大韓産業醫學會 2003 대한직업환경의학회지 Vol.15 No.2

목적: 이 연구는 이황화탄소 취급 사업장에서 근무한 경력이 있는 퇴직 근로자들을 대상으로 이황화탄소에 의한 건강영향을 조사함으로써, 이황화탄소 노출 후의 건강영향 파악 및 이황화탄소 노출 근로자에 대한 건강관리 기준 마련 등에 중요한 기초자료를 제공하고자 하였다. 방법: 이 연구는 우리나라 모 레이온회사에 근무한 경력이 있는 퇴직 근로자 중에서 1998년 12월까지 직업병 여부를 확인하기 위해 건강진단을 신청한 1,702명 중에서 이미 사망한 40명을 제외한 1,662명을 대상으로 하여 이 연구 목적에 대한 설명문을 우편으로 발송하여 참여 의사를 밝힌 258명을 면접대상으로 하여 최종적으로 177명을 분석 대상으로 하였다. 결과: 연구대상자는 남자가 147명, 여자가 30명이었고, 평균 연령은 55.4세이고 입사시 연령은 29.1세였다. 근무부서별로는 고폭로부서에 근무한 군이 156명으로 88%를 차지하였으며, 인정받은 군이 103명(58.2%), 받지 못한 군이 74명(41.2%)이었다. 평균 총폭로지수는 38.96(±31.18)이었고, 인정받은 군에서 받지 못한 군 보다 유의하게 높았고 (p=0.000). 고폭로부서군에서 저폭로부서군보다 높게 나타났다(p=0.000). 퇴사전후 시간에 따른 호소 증상들을 분석한 결과, 퇴사전후 시간 흐름에 따라 호소하는 증상들이 차이는 있지만 호소하는 증상들이 퇴사전과 퇴사후 5년 이내에 비해 퇴사후 5~10년인 경우에는 인정받은 군과 받지 못한 군 간에 유의한 차이를 보이는 호소 증상들이 적어지는 경향을 보였다. 그러나 퇴사 10년 이상인 경우에는 퇴사후 5~10년 이내에 비해 오히려 호소하는 증상들은 많아진 반면, 인정받은 군보다 받지 못한 군에서 유의하게 높았다. 따라서 이는 퇴사후 10년 이상이 되면 그 이전 기간에 비해서 호소하는 증상들은 직업병 인정에 올바른 영향을 미치지 않을 수도 있다고 생각되고 이러한 결과에 영향을 미칠 수 있는 여러 가지 요인들을 생각해 볼 필요가 있다고 생각된다. 인정받은 군에 대해서 직업병 인정시점을 기준으로 인정전후에 호소 증상의 변화를 비교한 결과, 대부분 직업병 인정전에 비해 인정후에 호소하는 증상이 감소하는 경향을 보이고 있어 직업병 인정후에 의료기관으로부터 증상관리가 이루어지는 것이 증상호소를 줄이는 데 기여한 것으로 생각되며 이밖에도 직업병 인정으로 인한 심리적인 보상도 영향을 미칠 수 있을 것으로 생각된다. 직업병 인정여부에 영향을 주는 요인에 관하여 분석한 결과, 총폭로지수와 퇴사후 최종 건강진단을 받을 때까지의 시기가 유의한 요인으로 나타났으며, 퇴사후 직업병 인정을 받을 때까지의 시간에 대한 Cox의 비례위험 회귀분석을 한 결과, 총폭로지수와 입사연령, 고폭로부서의 근무여부가 의미있는 요인으로 나타났다. 결론: 이 연구를 통하여 이황화탄소 취급 사업장에서 근무한 퇴직 근로자들을 대상으로 직업병 인정에 따른 호소 증상을 분석하고 직업병 인정에 영향을 주는 요인을 분석해 봄으로써 이황화탄소 노출에 의한 건강영향을 파악하고 폭로 이후의 증상변화를 예측 관리할 수 있는 자료를 마련하고자 하였으며 이는 이황화탄소 노출 근로자들에 대한 건강관리에 기초자료로 의미를 가질 것으로 생각된다. Objectives: To investigate the chronological subjective symptoms and related factors in exworkers who were occupationally exposed to Carbon disulfide. Methods: One hundred and seventy-seven subjects(147 males and 30 females) were randomly selected among ex-workers and interviewed by well trained doctors, who filled out a structured questionnaire developed by authors on the subjective symptoms. The questionnaire was composed of symptoms in the head and neck, and those of the neuro-psychological, respiratory, endocrine, musculoskeletal, and reproductive systems. Other factors such as general and occupational characteristics including work department, work duration, duration since cessation of exposure, and compensation for occupational disease were also investigated. Results: The mean subject age was 55.4 years. The mean cumulative exposure index (CEI) was 38.96±31.18. CEI was significantly higher in the compensated group(47.61±32.51) than in the non-compensated group(26.81±24.75)(p=0.000). Symptom complaints were significantly higher in the compensated group in all organ systems, and their incidence increased gradually until 10 years after cessation of work, and then decreased. The mean duration for cessation of exposure at the time of compensation was 10.97 years. The significantly different factors between the compensated group and the non-compensated group were total cumulative exposure index and the time interval between the cessation of work and the time of compensation. Conclusion: Our findings suggest that total cumulative exposure index and the time interval between the cessation of work and the time of compensation may be important factors affecting the compensation for occupational disease. Therefore, further studies will be necessary.