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본 연구는 수피 부산물 비료의 돈분 부산물 비료의 부숙단계별 시료의 유기물 분획의 함량 변화, Δlog K값과 RF값 등의 분광학적 특성 변화, 원형여지 chromatograp의 변화를 측정하여, 부숙도의 판정 기준 설정을 위한 기초 자료로 활용하는데 그 목적이 있다. 그 결과를 요약하면 다음과 같다. 수피와 돈분 부산물빌 중 HA-C와 FA-C의 함량은 대체로 부숙이 진행됨에 따라 감소하는 경향이었고, HA-C/FA-C 비는 증가하였다. 수피와 돈분 부산물 비료의 Δlog K값은 부숙이 진행됨에 따라 감소하였으며, RF값은 증가하였다. 생수피의 부식산 형태는 R_p 형태였으나, B형태를 거쳐 120일경과 후 A형태로 변화하여 거의 완숙상태에 도달하였으며, 돈분 부산물 비료의 경우 40일경과 후에도 B형태로 나타나 유기물질의 부숙이 진행중인 것으로 판단되었다. 수피부산물 비료의 원형여지 chromatograph는 120일경과 후에 규칙적인 톱니 모양을 하고 있어 완숙단계에 이른 것으로 판단할 수 있었으나, 돈분 부산물의 경우는 40일이 경과한 후에도 부분적으로 불규칙적인 모양을 하고 있어 부숙이 진행되고 있는 상태인 것으로 판단할 수 있었다. Changes of the spectroscopic characteristics of the organic matter fractions and circular filter paper chromatograph were assessed for the bark and piggery manure composts during the composting. as an approach to base the criteria of the compost maturity evaluation. Contents of humic acid-C (HA-C) and fulvic acid-C (FA-C) in both bark and piggery manure composts were decreased as the composting got closer to maturity, but the ratios of HA-C/FA-C were increased. During the composting. Δlog K values were decreased, but RF values were increased. Humic acid of the mature bark compost after 120 days of composting was A-type, as compared to Rp-type for the raw bark and B-type for the immature compost. However. humic acid of the mature piggery manure composts after 40 days of composting was B-type, indicating the humification of the organic matter fractions continued at this stage. Circular filter paper chromatograph of the mature bark compost exhibited the regular sawteeth pattern at the edge, but that of the mature piggery manure showed an irregular sawteeth pattern. Results demonstrated that spectroscopic characteristics and circular filter paper chromatograph of the organic by-product composts might be employed for the compost stability assessment.
This thesis aims at studying one of the ways which grasps exactly environmental qualities. For this purpose, this paper examines the cognitive dimensions of environmental identity which is the identity that a person or group has with his environment, in particular when he is experiencing it as an insider. There are two important dimensions: the vertical dimension and the horizontal dimension. The vertical dimension is classified by the degree of relationship between the observer and the environment. The horizontal dimension is classified by the scale of the environment concerned with its users.
본 연구의 목적은 ANSI N13. 11-1983의 시험기준에서 제시한 개인선량계의 선량평가 시험범주를 모두 만족시킬 수 있는 선량평가 알고리즘을 개발하는데 있다. 알고리즘 개발 대상 개인선량계로는 Teledyne Isotopes사의 PB-3 열형광선량계로 하였다. 개발된 알고리즘에 대한 미국 Atlan-Tech사와의 2차례의 검증결과, 본 알고리즘은 ANSI N-13. 11-1983의 선량평가 범주를 모두 만족시키는 것으로 나타났다. The purpose of this study is to develop an algorithm of TLD dose evaluation to meet all requirements stated in ANSI N13. 11-1983. It made the PB-3 TLD of Teledyne Isotopes an object of the development. Personal dosimetry performance testings of the development algorithm have been performed twice through the Atlan-Tech, INC. in accordance with the criteria of testing described in ANSI N13. 11-1983. As a result, it is assured that the developed algorithm has complied with all requirements stated in ANSI N13-1983.
Anisakiasis refers to parasitic infestation by nematode larvae that belongs to the subfamily Anisakinae, and this condition is seen in people who eat inadequately prepared or raw salt-water fish. While gastric anisakiasis is commonly diagnosed by endoscopic technique, intestinal anisakiasis is rare because it is less common and the clinical and radiologic features are poorly understood. The authors report a case of human anisakiasis involving the ileocecal valve in 62-year-old man who had the history of eating raw cuttlefish.
To investigate nutrient dynamics of the lake and fish community, both water and fish samples were collected at three different areas (dam site, upper inflowing and downstream of lake outfow) for one year from Sep.2004 to Aug.2005 During the experimental periods, mean concentration of chl, a in epilimnetic layer (0-5m) was 18.5mg^(-3) and transparency ranged from 0.3m to 2.4m, respectively. In nutrient, mean concentrations of TP and TN were 111 mgP m^(-3) and 4.4 mgN L^(-1), respectively. Based on the water quality standard suggested by U.S.EPA(*1976), the trophic state of Lake Doam was classified as eutrophic state. Total number of fish collected in Lake Doam was 9,600 indiveduals in 26 species of 6 family. Sixteen of Korean endemic soecies including H. mylodon, A. signifer, P. tenuicorpa occurred. O. mykiss as introduced fish was also found in Lake Doam. Dominant and subdominant species were P. herzi and Z. platypus that took about 34.6% and 22.5% of total fish composition, respectively. Six species including A. signifer. P. tenuicorpa. and R. kumgangensis were rare in Lake Doam. Pelagic typw of figh commonly occurred at upper regions, whereas benthic type was mainly domenated at downstream area. Therefore, pollution source inflowed from the upper regions did not seriously affect downstream area (Songcheon water system) due to the role of dam as pollutant barrier. In addition high appearance of Comat type of fish that si hybrid between gold fish (C.auratus) and C. auratus was found in the lake, It was unclear the reasons that high prorortion of mutant species apperared in the lake. Further more researches are required in this area.
In reference to the ISO-4037 and ANSI N13.11, appropriateness of the shielding and collimating system, and suitability of the irradiation and its environmental conditions of a 20 Ci Cs-137 gamma-ray irradiator installed in Korea Institute of Nuclear Safety(KINS) were investigated. Upon the installation of the irradiator, condition of collimator alignment and virtual beam cross section were examined by use of a portable He-Ne laser. In order to evaluate the fitness of the secondary(scattered) to primary ratio of the collimated gamma-ray beam from the irradiator in light of ISO and ANSI requirement, the measurements of the secondary to primary ratio were performed by use of a cavity type ion chamber which had been calibrated in a calibration laboratory that maintains reliable traceability. For the theoretical assessment of the gamma-ray field the collimated beam were divided into fifteen sectors and for each sector the secondary to primary ratio and the gamma-ray spectrum was simulated by means of Monte Carlo method. The outcomes were compared with the experimental results, and cause of scattering and the existence of alleged modifying factors in the irradiator were examined.
임파구의 염색체이상 빈도로부터 피폭자의 흡수선량을 구하는 방법은 사고로 인해 급성피폭을 받는 경우 유용하게 사용될 수 있다. 그러나 방사선 피폭 후 시간이 경과함에 따라 불안정 염색체이상을 가진 임파구는 감소하게 된다. 이에 방사선 치료후 시간 경과에 따른 불안정 염색체이상 빈도의 변화를 규명하고자 한다. 전골반에 50.4 Gy의 방사선 치료를 받은 총 20명의 자궁경부암 또는 자궁내막암 환자를 대상으로 41개의 검체를 얻었다. 채혈의 시기는 방사선 치료후 1일 3주, 6주, 12주, 24주, 52주, 104주, 156주, 208주, 520주로 하였다. 이들 말초혈액의 임파구에 대해 전혈미세배양을 실시한 후 임파구의 불안정 염색체이상을 관찰하여 Ydr, Qdr, Qdra를 얻었다. Ydr 값은 방사선 치료가 끝난 직후부터 3주까지 plateau를 보였고 이후 감소하는 경향이었다. Ydr의 평균값은 치료후 3주에 0.29에서 급격히 감소하여 2년후 0.05로 감소하였으며 이후 5년까지 서서히 감소하였다. 회귀분석을 실시한바 Ydr = 0.259×exp(-0.0429T)+0.0560×exp(-0.00106T)(time in weeks)로 나타났다. Qdr값은 치료 직후부터 24주까지 1.51 전후로 거의 변화가 없었으며 이후 감소하여 52주 이후에는 1.17 전후로 거의 일정하였다. Qdra 값은 치료 직후부터 12주까지 1.10 전후이며 이후 감소하여 52주 이후에는 0.81 전후였다. 피폭 후 시간경과에 따른 Ydr 값의 감소는 두 component exponential 모델을 잘 맞고 이 식을 이용하여 생물학적 선량측정이 가능하다. Qdr 값 및 Qdra 값은 피폭후 시간경과가 짧은 경우 피폭선량을 추정하는 지료로 사용할 수 있다. It is good method to use frequency of chromosome aberration in lymphocytes for a biological dosimetry in cases of accidental exposure to radiation. But in cases of past edposure, biological dosimetry is limited because the friquency of aberration decreases by time after exposure. To provide a basic data for estimationof past radiation exposure, the changing pattern of frequency of unstable chromosome aberration by time interbal after exposure was studied. Observation was made on peripheral lymphocytes of 41 blood samples from 20 patients treated for uterine cervical carcinoma and endometrial caricinoma. The patients received 50.4 Gy radiation to whole pelvis. Elapsed times after the completion of radiation therapy were 1 day, 3, 6, 9, 12, 24, 52, 104, 156, 208, 260 and 520 weeks. All the blood sample were microcultured. The Ydr, Qdr and Qdra were calculated form frequency of unstable aberration. Ydr did not decrease for 3 weeks after radiation therapy, and thereafter, decreased very rapidly and reached 0.05 at two years after radiation therapy and decreased very slowly until 5 years after radiation therapy. Relationship between unstable chromosome aberration and time interval after radiation therapy was described as Ydr = 0.2590.259×exp(-0.0429T)+0.0560×exp(-0.00106T)(time in weeks) Qdr remained constant at 1.51 until 24 weeks after radiation therapy and then decreased to 1.17 at 52 weeks. Therafter, it did not change. Qdra remained constant at 1.10 for 12 weeks after radiation therapy and decreased to 0.81 at 52 weeks. Thereafter, it remanined constant. Two superimposed exponential Ydr disappearance rate wuggests that it is possible to calculate the past exposure dose. When the elapsed time after exposure is short, Qdr and Qdra are useful papameters for biological dosimetry for past radiation exposure.
This study was carried out to evaluate the relations among working environments, health behaviors and satisfaction with their duty in a group of 200 ship-repair workers in the ROK navy. The results were as following; Age of workers was 40 years and over(83%) and working duration was 10 years and over (71.5%). Most of them were married and had studied beyond high school. The 69.5% of workers satisfied with their job, whereas. about 59.5% of workers had satisfaction with their working condition. There were current drinkers, 78.5%, current exercising workers, 43.5%, obese workers, 28.0%, and salted food intakers, 18.5% in the workers. The major harmful environmental factors in the ship-repair workplace are noise, vibration, dust and chemicals. Most of workers are exposed to above harmful factors and complained about exposure of noise and dust. The consumption of cigarette or alcohol in people who exposed to noise was much higher than in people who did not, but the difference was not statistically significant. Prevalence of obesity and hypertension were not significantly different between the exposure with noise and dust. Noise or dust exposure was significant relation to satisfaction with their duty and working condition. The affective factors for satisfaction with their duty were people who worked for 10 years or more(OR= 4.53), exercisers(OR=4.78) and dust(OR=3.05) in Logistic regression analysis.
To investigate the effects of ethanol on the lipid metabolism in blood and liver, twenty one male Sprague Dawley rats had orally taken the 25% alcohol and 50% alcohol by 5g per Kg of weight during 3 weeks after the adjusting period. For the energy balance, 85% sucrose and 45% sucrose was added in control group and 25% alcohol group each. The weight was reduced by alcohol treatment according to the levels, otherwise the weight of liver and heart was little increased in alcohol groups rather than in control without significance. Moreover, RBC, WBC, hemoglobin and hematocrit were increased by alcohol treatment according to the levels without significance. Otherwise, adjusted bilirubin levels by 100g of weight was significantly increased by alcohol treatment dose dependently. Alcohol induced RBC degradation and increased circulated bilirubin because of liver damage. For blood lipid profiles, blood cholesterol was increased in 50% of alcohol group compared to that of 25% and control groups, otherwise, blood triglycerides (TG) was increased by 30% in 25% alcohol groups rather than in control but not significantly different. The hepatic lipid composition, cholesterol levels in alcohol treatment groups was lower than those in control. The hepatic TG was not influenced by alcohol treatment. The two reasons of decreasing hepatic lipids were suggested by 85% sucrose of control for energy balance more synthesized cholesterol and TG than those in 25 or 50% alcohol groups, and by cholesterol and TG could not be synthesized because of liver damage from alcohol.