구조물의 최적안전지수와 생애주기비용의 상관관계에 관한 연구

방명석 ( Myung Seok Bang ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.6

본 연구는 구조물의 최적안전수준과 수명기간동안 투자되는 총비용과의 상관관계를 연구하였다. 설계, 건설 및 공용 중 투자되는 총비용을 최소화하면서 최적의 안전수준을 결정하기 위하여 신뢰성해석을 수행하였다. 신뢰성해석에는 설계인자들의 불확실성과 설계 및 공사, 유지관리를 수행하는 인간의 오류 등 인적 불확실성을 확률변수로 고려하였다. 이러한 확률해석을 통한 안전지수와 생애주기비용의 상관관계를 연구하고, 생애주기비용의 분산도에 따른 안전지수의 민감도해석을 통하여 최적의 안전수준을 결정하였다. 해석결과는 이러한 평가방법이 교통시설물에 투자되는 비용을 최소화하면서 최적의 안전수준을 결정할 수 있는 정확하고 유용한 방법임을 보여주었다. This study was intend to develop the optimal design method of suspension bridge by the reliability analysis based on minimization of life cycle cost(LCC). The reliability analysis was performed considering aleatory uncertainties included in the result of numerical analysis. The optimal design was estimated based on life-cycle cost analysis depending on the result of reliability analysis. As the effect of epistemic uncertainty, the safety index (beta), failure probability (pf) and minimum life cycle cost were random variables. The high-level distributions were generated, from which the critical percentile values were obtained for a conservative bridge design through sensitivity assessment.

산업안전관리의 개선방안에 관한 연구

조주현 한국산업안전학회 1986 한국안전학회지 Vol.1 No.1

생산위주의 개발도상국 진입으로 산업재해가 크게 증가하는 추세에 있음은 중대한 문제로 되고있다. 산업안전관리는 기술적으로 잘하면 최대 98%까지 예방가능한 분야이다. 안전사고의 원인을 이적 근로자적 측면에서 경영자적 측면에서 분석하고 이를 조화 또는 통제하는 요인으로 관리적, 행정적 요인을 분석하였다. 개선방안은 산업의 고도화, 다양화에 따른 신기술부족, 안전지식 및 교육부족, 그리고 중소기업의 산업안전 보건시설 개선의 미홉등, 이들 직접 원인에 대한 통제 및 조화 수단으로서 법체제, 행정조직을 강화하고 산업안전관리를 민간주도로 추진해나갈 연구 및 예방기관의 육성이 되어야 한다.

방전 Plasma 반응에 의한 NOx 의 안전처리에 관한 연구

최재욱,산외서수 한국산업안전학회 2000 한국안전학회지 Vol.15 No.2

In this experiment, we studied about concentration characteristics of NO_χ and generation of ozone in the reactor of corona discharge type by using mixed gas of NO/N₂ and N₂/O₂. In the case of the initial NO concentration increased, decrease rate of NO concentration was weakened and discharge input power of minimum NO concentration became high. When NO concentration was high, NO decomposition limit was appeared. And NO reduction rate was decreased, when initial NO concentration and discharge input power increased. When discharge input power was 5W, we could know the most proper energy value for treatment of NO. When the concentration of initial NO increased, generation of ozone decreased and in the case of same concentration of NO, according to discharge input power increase, generation of ozone increased.

최적 설계법을 이용한 구조물 안전을 위한 질량 감소 연구

신귀수,이기형,정인성 한국산업안전학회 1998 한국안전학회지 Vol.13 No.1

This paper is presented that theoretical optimization design method in order to consider mass reduction for the structural safety. In this paper, it described methods for reducing vibration in structural safety by the determination of the optimum sizes and locations of running masses through formal mathematical optimization techniques. The optimization procedure which employs the tunning masses and corresponding locations is developed. Design variables are systematically changed to achieve low values of shear without a large mass penalty. Three optimazation methods are developed and tested. The first is based on minimizing the modal shaping parameter which indirectly reduce the modal shear amplitudes corresponding to each harmonic of airload. The second method reduces these amplitudes directly and the third method reduces the shear as a function of time during a revolution of the blade. The first method works well for reducing the shear for one mode responding to a single harmonic of the airload but has been found in some bases to be ineffective for more than one mode.

조선업 산업재해예방을 위한 안전의식 실태조사

이상도,이윤혁 한국산업안전학회 1998 한국안전학회지 Vol.13 No.1

The purpose of this study is to investigate the safety consciousness of the lobours working at the ship building or repairing yard at which the industrial accidents frequently happen, and to provide the basic data required for the prevention of those accidents. This study is made by analyzing the questionnaires of 208 labours working at various ship building or repairing industries at random. This questionnaire is focused on finding the baisc data for prevention of industial accidents and getting the public opinions and proposals of labours. The results obtained by this study are as follows ; The negative estimations of the labours to the safety are cultivation of safety consciusness, the safety behavior in company, the metters of arrangement and the estimation of industrial or post arrangement. The positive ones are the arrangements of the protective tools and equipments for safety, the rule of safety regulation and the order of works, and the status of health education within company.

차량 구조물 안전설계를 위한 진동특성에 관한 연구

신귀수,이기형 한국산업안전학회 1998 한국안전학회지 Vol.13 No.2

This is a study on the natural vibration characteristics of Vehicle frame. Nowadays, many trucks freight the over-load, do the car designers consider the over-load about 200% in the design. It's necessary to make the model of a vehicle and simulate it for the test of driving condition, durability and vibration behavior before the vehicle is manufactured. If it is possible to make a simulation using the static and dynamic analysis, this is very useful in accomplishing an optimal design of the vehicle. In this paper, we studied the vibration characteristics of a truck body frame. The automobile body frame model for experiment is made smaller than real size frame with the ratio of 1/10. The vibration characteristics of a frame is considered as one of main factors in analyzing and improving the problem for ride comfort, noise and vibration reduction. Therefore, we experimented two method to neglect the nonlinearity. First is bolting and second is welding at the joint section. We compared computer simulation results and experimental data.

전자장비 안전설계를 위한 PCB 의 설계단계별 열전달 해석

김재홍,김종일 한국산업안전학회 1998 한국안전학회지 Vol.13 No.2

The natural convection cooling of simulated electronic chips located on a printed circuit board(PCB) has been studied by Computer Aided Engineering(CAE). In CAE, 3-dimensional finite element model of simulated electronic chip was made to accomplish heat transfer analysis at each design stage of a printed circuit boards for thermal optimization. The simulated electronic chips are installed protrudent from the plate about 3㎜. The materials the plates are epoxy and aluminum. The results show that the chip with relatively high heat generation rates should not be close to each other. It is found, as well that cooling effect for the aluminum plate is superior to the epoxy plate and location of maximum temperature is significantly influenced by the structure variation of PCB. In developing PCB and electronic chips, it's recommended that CAE is very useful to estimate to the distribution of temperature.

도시가스시설에서 안전밸브의 분출성능에 관한 평가 연구

김영규,김청균 한국산업안전학회 1998 한국안전학회지 Vol.13 No.2

In order to evaluate the performances of safety valves for low pressure, the popping pressure and flow rate of the natural gas have been investigated. The measured results of the popping pressure show that there is a big scattering depending on the manufacture year of a safety valve. And sample A showed the ideal popping pressure mode compared to other B and C samples. The popping flow rate of the safety valve is proportional to the seat size as the inlet pressure increases. These results may be used as a guideline for a design and diagnosis of the safety valve.

원전의 안전성 제고를 위한 CFMS 의 인간공학적 설계 검토

이용희,정광태 한국산업안전학회 1997 한국안전학회지 Vol.12 No.4

In order to improve the safety of nuclear power plant, we performed a human factors review for the CFMS(Critical Function Monitoring system) design of nuclear power plant. Three works were performed in this study. In first work, we developed human factors engineering program plan(HFEPP) and human factors engineering verification and validation plan (HFE-V & V plan) to effectively perform CFMS design and review. In second work, we identified human engineering discrepancies(HEDs) for CFMS design through human factors design review and proposed those resolutions. In the third work, we developed the evaluation and management methodology for identified HEDs. Methodology developed in this study can be used in other complex system as well as in CFMS design review.

소규모 사업장의 산업재해 특성과 예방대책에 대한 연구

김유창 한국산업안전학회 1998 한국안전학회지 Vol.13 No.2

The production activity by human is accompanied by various accidents which resulted in human and property loss. If information on these industrial accidents could be collected and analyzed for the purpose of preventing industrial accidents, we would be able to get rid of industrial accidents. The accidents which involved absence from work at least 4 days in small manufacturing factories were considered in this study. 84 accidents which occurred in 1996 were investigated. These accidents were analyzed in terms of employment sector, work period, cause of accident and form of accident. The accidents of small manufacturing factories are numerous and are often serious and worthy of greater attention than they have received. Successful strategies for accident prevention depend on effective analysis.