액체소듐속에서 소듐-물반응에 의한 재질의 Wastage현상

정경채,정지영,김병호,김태준,최병해,최종현,김의식 한국공업화학회 2003 응용화학 Vol.7 No.1

In this study we observed and analyzed the corrosion phenomena in leak site and the effect on temperature at the target surface of heat transfer tube material by sodium-water reaction through water leakage in liquid sodium atmosphere. Surrounding of leak hole of the specimen was damaged by the wastage phenomena due to corrosion and erosion of material, and hole size by damage of leak site was extended from 150㎛ to about 200㎛. Also, the damaged size appeared in the target surface was observed to about 1000㎛ diameter. The temperature of target surface increased about 70~80℃ by the heat of sodium-water reaction even with the small leakage of 15㎖ water. From the results of EPMA and EDX analysis, damaged area are found to covered with complex compounds such as (NaOH+Na_2O) FexOy or (NaCrO_2+nA_2CrO4) mixed up with the sodium oxides by sodium-water reaction and the Fe or Cr element by matrix of tube sodium oxides by matrix of tube material.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

중소규모 사업장 근로자의 직무스트레스로 인한 결근, 조퇴 현황과 한국형직무스트레스 하부요인과의 관련성

김정훈,박신구,김동현,김환철,임종한,이의철,이동훈,이지영 大韓産業醫學會 2009 대한직업환경의학회지 Vol.21 No.2

목적: 중소규모 사업장 근로자들의 직무 스트레스로 인한 결근, 조퇴의 현황과 한국형 직무 스트레스 하부 요인과의 관련성을 알아보고자 하였다. 방법: 중소규모 사업장 83곳 근로자들에 대해 한국형 직무스트레스요인 평가도구-단축형(KOSS-SF)과 사회 일반적 특성, 직업적 특정 및 직무스트레스로 인한 결근이나 조퇴 경험여부 등을 묻는 구조화된 자가 기입식 설문을 실시하였고, 응답한 4,350명에 대해 최종 분석을 시행하였다. 직무스트레스로 인한 결근, 조퇴와 한국형 직무스트레스 하부 요인들과의 관련성을 확인하기 위하여 로지스틱 회귀분석을 시행 하였다. 결과: 직무 스트레스로 인한 결근, 조퇴를 한 근로자는 남자에서 7%(196명), 여자에서 8%(113명) 로 조사되었고 한국형 직무 스트레스 하부요인과의 관련성에서는 남, 여 모두 직무요구, 관계갈등, 조직체계, 보상부적절, 직장문화 영역의 스트레스가 높은 군에서 통계적으로 의미있게 직무스트레스로 인한 결근, 조퇴율이 증가하였다. 결론: 중소규모 사업장 근로자들의 직무 스트레스로 인한 결근, 조퇴와 한국형 직무 스트레스 하부요인과의 관련성은 남자에서는 조직체계 영역이 가장 높았고, 여자는 직장문화 영역에서 가장 높은 관련성을 보였다. Objective: The aim of this study was to examine the actual conditions of absence and early leave due to job stress of 4,350 workers in 83 small and medium scale industries, and its relationship to job stress factors using Korean Occupational Stress Scale-Short Form (KOSS-SF). Methods: A structured self-reported questionnaire was used to assess each respondent's Sociodemographics, job stress, experience of absence and early leave due to job stress. Seven KOSS-SF domains of job stress were used. We estimated the relation of absence and early leave due to job stress and job stress factors using logistic regression analyses. Results: Absence or early leave due to job stress occurred in 7% of male workers and 8% of female workers. Multiple regression analysis revealed a significantly positive association job stress-related absence/early leave and job demand, interpersonal conflict, organizational system, lack of rewards and occupational climate. Conclusions: Absence and early leave due to job stress is significantly attributed to organizational System and lack of reward for men, and occupational climate and organizational system for women.

유기성 Sludge가 잔디의 생육과 토양의 화학적 특성에 미치는 영향

金鼎濟,梁在義,趙富衍 江原大學校 附設 環境硏究所 1991 環境硏究 Vol.8 No.-

Various kinds of the industrial wastes, when introduced into the environment, can cause many problems, Proper treatment and utilization of the wastes thus are one of the recent environmental concerns. A greenhouse experiment was conducted to investigate the influence of organic sludge from the beer manufacturing process on the growth of the Korean turf (Zoysia japonica, STEUD.) and the chemical properties of the soil. Treatment levels of the experimental organic sludge, which was pre-treated with quicklime, were ranged fom 0 to 20kg/m³. Sowing dates were 5 to 30 days elapsed after the sludge application. Increasing levels of the experimental sludge increased height, root length, number of leaf, and yields of the turf. Planting periods interacted with treatment level of the sludge to show a positive effect on the growth parameters. Uptakes of nitrogen and calcium were also enhanced by treatment. Soil organic matter and exchangeable Ca contents were increased by the sludge treatment. Sludge caused to increase soil pH upto 8.3 and this maintained for over 60 days. A possibility to utilize this organic sludge as a fertilizer could be supported by results of positive effects of this sludge on growth, nutrient uptake and soil fertility parameters, Further researches on the utilization of the industrial wastes, concerning on treatment level, long term effect, and a possible side effect, should be followed.

스코폴라민 첩포가 젊은 정상 성인 남자의 수면 구조에 미치는 영향

김의중,정도연 大韓神經精神醫學會 1995 신경정신의학 Vol.34 No.5

It is well known that the administration of scopolamine as an injection or oral form could influence the sleep architecture, especially REM sleep latency and duration. In clinical usage of scopolamine, it is the most effective single drug for the prophylaxis and treatment of motion sickness. Among the routes of administration, the patch form is preferred, because of its easy administration and the long duration of action(72hr). But there have been found no studies about the effects of scopolamine patch on sleep. In this study the authors intended to find the effects of scopolamine on sleep variables, especially REM sleep-related variables using transdermal scopolamine patch. One scopolamine patch contained 1.5mg of scopolamine. For each of the eight young adult male volunteers, the authors applied scopolamine patch and placebo alternatively in a randomized double-blind cross-over design. The subjects' sleep was studied polysomnogaphically using Grass model 78 polysomnogaph for three nights including one adaptation night. The scopolamine patches did not alter sleep architecture such as percentage of sleep stage 1, 2, 3, 4 and REM. Total wake time, sleep latency and sleep efficiency were not different between scopolamine and placebo nights. REM latency, duration of each REM sleep period and total REM sleep period did not differ between scopolamine and placebo nights. The authors conclude that the administration of a single patch of scopolamine in the evening for the night time travellers may have apparently minimal effects on sleep and does not seem to influence the major sleep architecture. However, it still remains to be answered whether scopolamine patch influences the "micro" level of sleep structure and/or function, such as phasic REM components.

빌딩성능개선 설계지침 설정을 위한 통합평가의 모델

김치환,정의용 대한건축학회 2004 대한건축학회논문집 Vol.20 No.6

It may be said that building performance is the whole value endowed with architectural environment to meet human and social needs and requirements changing continuously. The value of building is endowed with the performance objectives of its integrated system composed of various types of subsystem. A project of building performance improvement begins with a consideration of the these performance objectives of various building system. And the building performance improvement is providing a lot of solution in improving building performance such as structural, spatial, environmental and energy performance improvement In this aspect, this study suggests the conceptual model for integrated evaluation of building performance tracking the dependence of effect on cause of occupant's unsatisfaction to establish design brief in the building performance improvement. For the practical application of this concept, it will be needed to develope the relational application system between Post-Occupancy Evaluation and Building Performance Evaluation making use of performance metrics and evaluation mapping as tools of integration.

대장암종에서 암관련 유전자들의 Promoter Methylation과 암종 발생 및 진행과의 관게에 대한 연구

정동준,이정은,민영기,조성우,백무준,양승하,김의한,김창진 순천향대학교 교수학습개발센터 2004 Journal of Soonchunhyang Medical Science Vol.10 No.3

The colorectal corcinoma is one of the most common malignant tumor in Korea and its carcinogenic mechanism has not been elucidated exactly yet. So far, the most common carcinogenic mechanism has been known to be multiple genetic changes. But, the CpG island hypermethylation has been revealed to be one of the most important carcinogenic mechanism second to the genetic changes. The epigenetic changes characteristically imprint and transfer to the next generation without changes of nucleotide sequences. When the CpG island of promoter or 5'- exon 1 of a specific gene is methylated by DNA methyltrasferases (DNMTs), the gene expression is inhibited. Carcinogenic mechansisms by promoter methylation has been well known, but the progression of the cancer has not been elucidated yet. The molecular researches on the carcinogenic mechanisms largely depended on the tumor tissue containing various components of cell, due to difficulties in harvesting pure homogeneous tumor cells. Promoter methylatonof the cancer related genes as APc, hMLH2, p16, DAP-K and MGMT in 50 cases of sporadic colorectal carcinoma was studied. The pure normal colorectal epithelial cells, and cancer cells from superficial and deep invasive portion were harvested respectively by laser captured microdissection(LCM), and DNA was extracted from them. The promoter methylation was studied by methylation specific poymerase reaction (MSP) after bisulfite modification of the DNA and the expression of the genes by immunohistochemistry. The results suggests that promoter methylation of the cancer related genes are closely related with the colorectal carcinogenesis and it occurrs from early phase of carcinogenesis, progressing constantly to the late stage. And the promoter methylation of normal epithelial cells increased by age. The p15, known to be the genes related to hematologic malignancy, was closely related to the colorectal carcinoma as well.

鼻毛의 白毛發生에 의한 年齡推定

김진국,홍석찬,진정언,박의우,김동욱 大韓法醫學會 1999 대한법의학회지 Vol.23 No.1

The gray vibrissae of Korean males(n= 189) between 15 and 75 years old and females(n=111) between 15 and 74 years old whop visited the department of otorhinolaryngology, Konkuk university Chungju hospital during 1996 to 1998, were counted for the purpose of estimating approximate age range in individuals of unknown age. The lowest age appearing gray hairs in both sexes was 15-year-old. The Pearson's correlation coefficient in both sexes was 0.490 (p<0.01). The age appearing gray vibrissae in females was slightly earlier than that of males, however, the differences between right and left sides of nasal cavity were insignificant. This method of counting gray vibrissae would be useful to estimate age range in personal identification together with other methods available until now.

SWAT모형을 이용한 영산강 유역의 비점오염 분석

김철,박의정 호남대학교산업기술연구소 2009 산업기술연구논문집 Vol.15 No.-

비점오염원은 강우시 지표유출에 의해 유출되기 때문에 발생지점 및 발생량 추정이 어려우며, 이에 대한 처리가 어려운 실정이다. 현재 점오염원의 처리가 어느 정도 달성된 선진국에서는 비점오염원이 가장 중요한 오염원으로 대두되고 있는 실정이다. 따라서 본 연구에서는 비점오염을 분석하기 위해 영산강 유역을 대상으로 SWAT모형을 모의하였다. 지형자료로는 토지피복도와 토양도, 그리고 기상자료로는 강우량, 일사량, 기온, 풍속, 상대습도를 구축하였다. 영산강 유역에 대해 오염총량 관리유역별로 2000년~2008년 까지의 비점오염 부하량을 산정하였다. Because non-point pollution source is outpoured by sunace flow at rainfall, occurrence point and occurrence amount estimation are difficult, and treatment for this is difficult. Advanced nation that processing of present point pollution source reaches about is real condition that non-point pollution source is risen to the most important pollution source. As topography data, land cover and soil map were constructed. and As meteorological data rainfall, solar radiation, temperature, wind speed, and relative humidity were constructed. Until 2000 ~ 2008 year by pollution total amount administration basin non-point pollution loads were calculated in Yeongsangang basin.

세라믹 재료의 연삭 특성에 관한 연구

정을섭,김성청,김태봉,소의열,이근상 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3

In this study, experiments were carried out to investigate the characteristics of grinding and wear process of diamond wheel for ceramic materials. Normal component of grinding resistance of AL_2O_3 was less than that of Si_3N_4 and ZrO_2. This seems to be the characteristics of ceramic tools on work pieces both of high hardness. For the case of Si_3N_4 and ZrO_2 as the mesh number of wheel increases, the surface roughness decreases. For the case of Al_2O_3, the surface roughness does not decreases. Specific grinding energy decreases as the material removal rate per unit time increases. For the case of Si_3N_4 and ZrO_2, grinding is carried out by grain shedding process due to brittle fracture.