• 대한안전경영과학회지
• /
• 제19권4호
• /
• pp.63-76
• /
• 2017

This thesis provides background information on DFS carried out by the government in an effort to reduce the accident rate, cases of DFS in other advanced countries to study their risk detection, risk assessment, risk control measures, and cases in which application of DFS during the designing phase succesfully led to reduction of the accident rate. Till now, the focus has been on incident responses after the occurance of accidents, it describes the importance of considering safety during the desining process through safety results and cases.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제31권2호
• /
• pp.164-169
• /
• 2005

Tuberculosis is a systemic disease with a world-wide distribution, and its occurance in the oral cavity is well documented in the literature. Disease of oral cavity and jaw caused by Mycobacterium tuberculosis is very rare, so it is often difficult to diagnose tuberculosis in the oral cavity. When granulomatous and ulcerative lesion persists in the oral cavity for a long time, it may be considered a tuberculosis. When differential diagnosis is needed, the most reliable indicators of mycobacterial infection are careful clinical evaluation, skin test, acid-fast staining, biopsy and culture. We report a case of tuberculous osteomyelitis which simultaneously occurred on the maxilla and mandible in a 85 years old man that proved diagnosis difficult, but which responded very well to surgical treatment and chemotherapy.

• 한국화재소방학회논문지
• /
• 제12권1호
• /
• pp.15-21
• /
• 1998

본 연구에서는 국내의 30년간 발생한 백화점 화재 사고사례를 토대로 그 심각성 예측을 위해 확률적 인 접근을 하였다. 백화점 화재의 년간 발생 건수와 그 피해액 정도를 고려하여 위험 수준을 산정해 보 았다 또한 본 연구에서는 백화점 화재발생 시나리오를 작성해 미국 NIST에서 개발한 FPETOOL 프로그 램을 이용하여 백화점에서의 화재에 대한 심각성을 예측하였다 . FPETOOL 프로그햄 실행 결과로 화재 발생시 인체가 위험해지는 용도, 연기충, 가스 농도의 수준에 도탈하는 시간올 알 수 있었다. 백화점에서 화재가 발생했을 경우 그에 따른 재산피해, 인명피해가 매우 크며, 잠재하는 위험성이 매 우 크므로 미연에 방지해야 한다.

• 한국농공학회지
• /
• 제17권2호
• /
• pp.3772-3777
• /
• 1975

This paper reports on the analysis of the distributions of probable days being good for mechanical rice harvesting and the method of determining the capacity of rice harvesting machinery for the given harvesting duration. In the analysis of the probability distribution of days being good for rice harvesting, the daily rainfalls above which mechanical field work may be impracticable were specified and their frequency of occurances was analyzed by using the weather records during past twenty-one years measured at five different locations. The conclusions being drawn from the analysis are as follows: 1. The distributions of probable workable days in different region and harvesting duration are very distinct and are different to set a uniform trend (refer to Fig. 1-4). 2. The occurance of probable days being good for mechanical field work under 66% confidence level are quite variable by region and by ten-day period. The analysis indicates that the probable workable days may range from 7.5 to 8.5 days of 10-day span within optimum harvesting duration (refer to Table 1). 3. Based on the probability distributions analyzed, the optimun capacities of harvesting machinery required for different harvesting areas and harvesting start-date were estimated as a function of operating duration (refer to Fig. 5 and Table 2)

• Journal of Yeungnam Medical Science
• /
• 제5권2호
• /
• pp.239-246
• /
• 1988

저자들은 diphenylhydantoin의 사용 후 발생하는 것으로 사료되는 용혈성 빈혈과 동반된 순수적혈구형성부전증 1예를 경험하였기에 간단한 문헌고찰과 함께 보고하는 바이다.

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2009년도 춘계학술대회 논문집
• /
• pp.83-87
• /
• 2009

램제트 엔진은 다른 공기흡입식 엔진에 비해 상대적으로 매우 긴 유로를 지니고 있음으로 인해 저주파 연소불안정에 취약한 단점을 지니고 있다. 본 연구에서는 램제트 엔진에서 발생하는 연소 현상과 동일한 메카니즘을 모사할 수 있는 연료분사장치 및 V-gutter 형태의 화염안정화장치를 장착한 소형 연소기를 설계/제작하여, 램제트 연소기에서 발생할 수 있는 연소불안정 현상을 시현하였다. 이 연소기에서 발생한 연소불안정은 연소시스템의 음향학적인 공진 주파수와 유사하게 나타남을 확인하였으며, 이를 통해 thermo-acoustic coupling에 의한 전형적인 연소 불안정이 발생하였음을 확인할 수 있었다.

• 대한핵의학회지
• /
• 제3권2호
• /
• pp.23-27
• /
• 1969

Plasma glucose levels before and after oral glucose administration have been compared in a group of 76 thyrotoxic subjects and a group of 8 normal control subjects in order to study the effect of glucose loading in thyrotoxicosis. Following were the results: 1. The mean fasting plasma glucose level was elevated in the thyrotoxic group(95.5mg%) compared to normal control group (88mg%). 2. The peak of glucose tolerance curve is at 30 minutes after glucose administration in both groups, but its mean value was 44mg% higher in thyrotoxic group than in control group. 3. The plasma glucose levels returned towards the fasting level in the later stage of the test more rapidly in thyrotoxic group than in control group. 4. 69.6% of oral glucose tolerance tests were impaired in the thyrotoxic group, and the occurance of abnormal glucose tolerance could be related to the degree of thyrotoxicity, sex and age. 5. The mechanisms of the impaired glucose tolerance in thyrotoxicosis are thought to be related to an increased rate of glucose absorption from gastrointestinal tract, abnormal liver function with decreased hepatic glycogenesis, increased glucose oxidation, decreased pancreatic release of insulin, and genetic relationship between diabetes and thyrotoxicosis.

• 한국안전학회지
• /
• 제5권1호
• /
• pp.57-66
• /
• 1990

The purpose of this study is to investigate electrostatic charge condition and possibility of electrostatic hazards in case of putting on synthetic smocks and antistatic garments for the purpose of prevention of electrostatic hazards due to a human body electrical charge. It is shown in case of a synthetic smocks, electrostatic voltage by friction is about 2,900 (V), half life period is 12 second, and electrostatic charge is 1.4―1.8 ($\mu$ C). When putting on a synthetic smocks, electrostatic voltage is 2,500―2,800(V). When putting on a jumper of chemical fiber, electrostatic voltage is 8,000(V) . It is, therfore, possible to cause a electrostatic hazards. It is also shown in case of a antistatic garments, electrostatic voltage by friction is 87(V) ―280(V) (washing 90 times), half life period is 3―5 second, and electrostatic charge is 0.24―0.28($\mu$ C) which is much lower than 0.6($\mu$ C) limitation of fire and explosion occurance. When putting on a antistatic garments, electrostatic voltage is 10(V) ―125(V). In conclusion, it is shown when putting on a antistatic garments it is possible to prevent a electrostatic hazards such as fire or explosion due to human body, to prevent a destruction of semiconductor elements and capacity decline, and to prevent a misoperation of automation facilities and semiconductor electric and electronic products.

• 대한기계학회논문집A
• /
• 제21권2호
• /
• pp.223-231
• /
• 1997

A variety of approaches have been investigated for the application of spark-ignition engine knock control. The control method implemented, here as "Fuzzy Control", has the advantage of not requiring the knowledge of a mathematical model of the controlled object and is more robust and flexible than conventional approaches. Knock control in this study is performed using vibration signal which is measured with accelerometer attached to the cylinder block of a 1498cc four-cylinder spark-ignition engine. The experimental results obtained with this method are compared with those obtained with a knock interval controller and with those of a conventional controller. Those results illustrate better performance in torque than knock interval controller and conventional controller.ontroller.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
• /
• pp.257-259
• /
• 1987

The photoelectronic properties of CdTe films sintered with various amounts of $CdCl_2$ and $CuCl_2$ have been investigated by measurements of dark electrical resistivity, photocurrent, thermoelectric power, optical transmission and by observation of microstructure. The grain size and optical transmission of sintered CdTe films increase with increasing amount of $CdCl_2$ indicating that $CdCl_2$ acts as a sintering aid. The photoconductivity gain(A-$cm^2/W$) increases and resistivity($\Omega$-cm) decreases with increasing amount of $CuCl_2$ up to 100ppm due to the occurance of Cu-doping during sintering. The dark resistivity could be reduced farther by post heat treatments. The dark resistivity was still high($10^3{\Omega}$-cm) so that the accurate determination of the hole concentration by Hall measurement or by thermoelectric power measurement was not possible. From the analysis of electrical activation energy, however it can be concluded that the hole concentration is less than $10^{14}/cm^3$ and all grains are depleted of carrier by the trapping centers at grain boundaries.