• 월간산업보건
• /
• s.258
• /
• pp.11-14
• /
• 2009

살균제인 pentachloronitrobenzene(PCNB)의 직업적 노출을 위한 TLV-TWA를 0.5 mg/$m^3$으로 권고하였다. 이 수준은 간에 영향을 미치는 것을 최소화하기 위한 수준이다 피부자극과 피부 흡수에 관한 것은 증명되지 않았다. PCNB에 대한 발암가능성을 흰쥐와 생쥐를 대상으로 생물학적 검정을 한 결과, 생쥐에서 양성이었다. 이러한 결과는 생물학적 검정에 사용한 PCNB가 공업용이었고 불순물로 포함된 hexachlorobenzene에 의해 암이 유발된 것으로 확인되었다. 따라서 FCNB 물질은 발암성 유발 인자(A4;Not Classifiable as a Human Carcinogen)로 권고하였다. PCNB의 Skin, SEN notation, TLV-STEL에 관한 정보는 충분한 데이터가 확보되지 않아 제공되지 못하고 있다.

• Korean Journal of Soil Science and Fertilizer
• /
• v.10 no.3
• /
• pp.153-170
• /
• 1977

Considering the ways for the possible improvement of soil test for upland crops, various methods for the evaluation of K supplying power and testing of available soil K were reviewed in terms of theoretical principles and practical usefulness of the each method. The review was also made on the characteristics of upland crops in K requirement and on the chemical properties of major korean upland and lowland rice soils in terms of K availability. Following is the few remarks drawn from the review. 1. Quite large number of methods have been known for the evaluation of K supplying power and testing for available soil K. In nature, they can be divided into two categories; capacity-based methods and intensity-based methcds. The capacity-based methods usually measure the exchangeable and some portion of nonexchangeable K, while the intensity-based methods suggest to consider the ractivity ratios of major cations in soil solution and the energy requirement for the replacement of exchangeable soil K into soil solution. 2. As methodology for extraction of interested part of soil K, chemical extraction, electrodialysis and ion exchange methods have been known. Among these, chemical extract ion is favorable because of its simplicity. However, recently suggested Electro-Ultra-Filtration method seems to merit further study for wider use for not only K but also other nutrient availability of soils. 3. The intensity-based methods, although they are more theoretical, because of their complexity, in methods may not be adapted for practical soil tests. 4. The exchangeable K which is rather simple to measure and which well reflects the status of K reserve as nonexchangeable and is immediate pool of water soluble K may be good, if not best, criterion of soil K availability to plant in common soil testing. 5. Because there are evidences that the abundance of available K alone may not be good inclication for availability of K to plant, it is recommendable to interprete the exchangeable K data as percent saturation of exchangeable K to total C. E. C. of soil for the recommend ation of K fertilizer based on soil tests. 6. Some pot and field trial results showed the trends that percent potassium saturation to total C. E. C. better serve as the parameter for K fertilizer recommendation.

• Animal Systematics, Evolution and Diversity
• /
• v.11 no.3
• /
• pp.359-377
• /
• 1995

Morphological and isozyme analyses were used to examine closely related species of Tridentiger obscurus and \ulcorner: brevispinis, a pair of cryptic species which has intricate problem with regard to species boundary, and to clarify the taxonomic position. In this study, it was revealed from their 17 allopatric streams that there are differences of band ornamentation on the lateral side and three genetic markers between two species. However, genetic relationship between them (S = 0.813, D = 0.192) was within the intraspecific level of similarity. However, at the sympatry of two species no hybrid was found except at Bangjuk stream where the electrophoretic hybrids with slight deficiency of heterozygosity were observed. It is shown that at sympatry there is a finer microenvironmental subdivision between two species at all populations including Bangjuk stream. To manifest the extent of assortative mating, four syrnpatric subpopulations at Bangjuk stream were analyzed for departure from Hardy-Weinberg equillibrium by F-statistics. All subpopulations were deviated significantly from the expectation under random mating. The evidences presented here supports the recognition of Tridentiger obscurus and T. brevispinis as semispecies in the late stage of reproductive isolation

• Proceedings of the KSRS Conference
• /
• 2000.04a
• /
• pp.108-113
• /
• 2000

1991년 5월 31일, 1996년 9월 1일 그리고 1997년 6월 17일의 Landsat TM 위성화상자료를 Tasseled Cap 변환을 통하여 추출되는 4번째 특징을 연무지수농도로 사용할 수 있는가를 알아보고 또한 이렇게 산출된 연무지수를 사용하여 각 일자별 대기오염측정인자와 기상측정인자와 비교하고 서울시 각 행정구별 연무현상에 대하여 알아보았다. 동일화상내에서 연무가 있는 삼림지역과 연무가 없는 삼림지역을 표본조사하여 검정한 결과 Tasseled Cap 변환의 4번째 특징이 연무지수와 관련되어 있음을 밝혔고 기상측정 인자의 시정거리와 연무지수사이의 역상관의 경향이 있음을 확인하엿다. 대기오염측정 인자의 경우 정확한 연관성을 파악하지는 못하였는데 이는 연무현상이 대기오염 물질의 2차 생성물에 의한 것으로 추정된다. 각 날자에서 1991년 5월 31일과 1997년 6월 17일 서울에 연무현상이 있음을 확인하였고 대체적으로 날짜에 상관 없이 중구, 종로구, 강남구, 서초구에서 높은 연무지수를 나타내었다.

• Annual Conference on Human and Language Technology
• /
• 2021.10a
• /
• pp.498-500
• /
• 2021

본 연구에서는 음운 변동에서 나타나는 오류가 어떤 변수에 영향을 받는지 확인하여 음운 변동 연구 및 교육의 기초 자료를 제공하고자 하는 데에 목적이다. 이를 위해 유음화 발음 데이터를 이용하여 성별, 유음화의 방향, 품사, 단어의 빈도, 단어의 음절수와 유음화의 발음 적격 유무를 변수로 설정하였다. 유음화 적격률에 영향을 줄 수 있는 독립변수를 찾기 위해 카이제곱 검정과 다중공선성의 팽창계수를 먼저 확인하였다. 이후 다중 로지스틱 회귀분석과 오즈비를 통해 유의한 예측인자를 검토하였다. 그 결과 5개의 독립 변수 중 성별과 유음화의 방향, 품사가 결과를 오류에 영향을 주는 주요한 인자가 되는 것을 확인할 수 있었다.

• Korean journal of applied entomology
• /
• v.56 no.1
• /
• pp.87-92
• /
• 2017

The Samurai wasp, Trissolcus japonicus (Ashmead) (Hymenoptera: Platygasteridae) is recognized as a solitary parasitoid on eggs of the stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), an economic pest causing severe damage to fruits, in South Korea. The wasp appears to be a potential biological agent of the pest. In addition, T. itoi Ryu and T. nigripedius (Nakagawa) were found to parasitize eggs of Eurydema gebleri Kolenati and Dolycoris baccarum Linnaeus, respectively. Diagnostic characters and photographs are provided for identification, and host records of Korean Trissolcus species are also given.

• Tuberculosis and Respiratory Diseases
• /
• v.50 no.6
• /
• pp.686-692
• /
• 2001

Background : Outbreaks of multidrug-resistant tuberculosis(MDR-TB) are caused by the low rate of treatment response due to limitation in number of available drugs and high rates of adverse drug side-effects. This study analysed the risk factors for MDR-TB patients, who did not respond to treatment, with an aim to improve the rate of treatment response. Methods : Retrospective study of 111 MDR-TB patients at National Mokpo Tuberculosis Hospital from Jan. 1996 to Dec. 1998 was made. The patients were separated into two groups ; group I comprised of patients who were treated successfully and group II comprised of those were not treated successfully. In order to analyze the risk factors for treatment failure, differences between the two groups were compared and the confidence limit regarding the results were tested using an independent t-test. chi-square test and a Fisher's exact test. Results : The treatment failure rate of MDR-TB patients was 32% (36 patients), and treatment success rate 68%(75 patients). This study found no significant difference between two groups in terms of age, sex, family history, extent of the disease on the chest X-ray, the number of sensitive drugs in the treatment regimen, and the number of sensitive bactericidal drugs in the treatment regimen (p>0.05). However, a past history of pulmonary tuberculosis, cavitary lesions on the chest X-ray, the number of treatments, the number of resistant drugs and the number of drugs used showed a significant difference(p<0.05). Conclusion : The rate of treatment failure in MDR-TB was increased by a past history of pulmonary tuberculosis, cavitary lesions on the chest X-ray, the number of treatments, the number of resistant drugs and the number of drugs used. For improving the treatment response of MDR-TB, every effort should be made to reduce the drug resistance caused by failure of the first treatment.

• Journal of the Korean Data and Information Science Society
• /
• v.20 no.5
• /
• pp.787-796
• /
• 2009

A random coefficient model is applied when times of the repeated measurements are not fixed in experiments with respect to the subjects. The procedures of the inference of a random coefficient model are same as those of a mixed model. Diet experimental data was used for applying the random coefficient model. Various random coefficient models are investigated for the experimental data, and are compared each other. Finally, optimal random coefficient model would be selected. It resulted from the analysis that for the fixed effect factor, the baseline, treatment, height, and time effect were very significant. The treatment effect of the diet foods and exercises were more effective in losing weight than the effect of the diet foods only. The fixed cubic time effect was very significant. The variance components corresponding to the subject effect, linear time effect, quadratic time effect, and cubic time effect of the random coefficients are all positive. When quartic time effect was added as random coefficients the model did not converge. Thus random coefficients up to the cubic terms was considered as the optimal model.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2004.05b
• /
• pp.1280-1284
• /
• 2004

본 논문에서는 월 댐유입량을 예측하는데 있어서 뉴로-퍼지 시스템의 적용성을 검토하였다. 뉴로-퍼지 알고리즘으로 퍼지이론과 신경망이론의 결합형태인 ANFIS(Adaptive Neuro-Fuzzy Inference System)를 이용하여 모형을 구성하였다. ANFIS의 공간분야에 의한 제어규칙의 선정에 있어 퍼지변수가 증가함에 따라 제어규칙이 기하급수적으로 증가하는 단점을 해결하기 위해 퍼지 클러스터링(Fuzzy flustering)방법 중 하나인 차감 클러스터링(Subtractive Clustering)을 사용하였다. 또한 본 연구에서는 기후인자들을 인력으로 하여 모형을 구성하였으며 각각 학습기간과 검정기간으로 나누어 학습기간에는 모형의 매개변수 최적화를, 검정기간에는 최적화된 모형의 매개변수를 검정하는 순으로 연구를 수행하였다. 예측 길과, ANFIS는 댐유입량 예측시 입력자료의 종류가 많아질수록 예측능력 더욱 정확한 것으로 판단된다.

• Korean Journal of Construction Engineering and Management
• /
• v.2 no.4 s.8
• /
• pp.62-68
• /
• 2001

The purpose of this study was to Identification the Risk of construction method to protect and reduce of construction period. Risk management is one of the key project management process. Numerous tools are available to support the various phases of the risk management process. We present the results of a study designed to identify the tools that are most widely used and those that are associated with successful project management in general, and with effective project risk management in particular. The study is based on a questionnaire administered to a sample of project managers from construction enterprises. The response data was analyzed in order to find which tools are more likely to be used in the those organizations that report better project management performance and in those that value the contribution of risk management processes.