• Journal of the Korean Society of Safety
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• v.20 no.4 s.72
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• pp.71-77
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• 2005

There are insufficient models that find problems and solutions for accident prevention through risk assessment and suggest safe work process and work instruction from foundation works to finish work for accident decrease. This paper presents a quantitative risk assessment model by analysis of risk factors in each process such as foundation, erection, structure, equipment finish and etc based on accident examples and investigation on actual condition in building. In addition, the safety management system was developed to perform risk assessment of construction and use it for effective safety training for labor.

• Journal of the Korean Society of Safety
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• v.31 no.1
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• pp.19-24
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• 2016

Rubber parts are widely used in many applications such as dampers, shock absorbers, and seals used in railway and automotive industries. Much research has thus far been conducted on property estimation and life prediction of rubber parts. To predict the service life of rubber parts at room temperature, most prior work adopts the well-known Arrhenius model that needs the accelerated life test in high-temperature conditions. However, they may not reflect the actual conditions of use that rubber parts are usually used under a specific strain condition during long period of time. In this context, we propose a method for the life prediction of rubber parts in actual conditions of use. The proposed method is based on the accelerated life test using stress relaxation during which three relatively high elongation percentages (100%, 200%, and 300%) are applied to the rubber specimens. Rubber specimens were prepared in accordance with KS M 6518 standard and three stress relaxation testers were fabricated for actual experiments. Finally, a inverse power model for life prediction was derived from experimental results. The predicted life was compared with the actual test life for validation.

• Journal of the Korean Institute of Rural Architecture
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• v.23 no.4
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• pp.13-20
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• 2021

This study aims to provide necessary, basic data for future space planning of rural housing through a survey on the size of residential space and space utilization of rural housing. To this end, this study analyzed the size and space of rural houses in actual use, and also analyzed the size and characteristics of the essential space for life, which were collected via a survey. In particular, Usan Village in Jangheung, where various types of houses and renewed houses coexist due to continued changes in the form of traditional villages, was selected for a target site of this study. In next step, this study analyzed the current status of use of each house in the village and compared the size of each space and the characteristics of space utilization. The results of the survey on Usan village, on where divergent traditional and modern houses are located, are as follows. First, Usan Village has total 31 traditional and modern houses. Most of the houses have been aging and formed into old-age households, and the expansion, renovation, and construction of farmhouses have progressed. Second, the population of Usan Village has decreased, and the number of residents per household is currently 1.4. Third, the survey indicates that the flat area of rural houses was 80.6m², the average area of living space was 54.1m², and the average area of water storage space was 26.5m², and the main living area was changed to water storage space due to the decrease in the number of household members in rural areas.

• Journal of The Korean Society of Agricultural Engineers
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• v.49 no.6
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• pp.55-62
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• 2007

Actual states of energy utilizations were investigated and analyzed on three representative rural villages in Chungcheongnam-Do. Rural residents were almost using the ondol boiler as a heating facility and oil(diesel, kerosene) and electricity(night thermal-storage power service) as a heating energy. There were a few households using briquette or firewood in a fuel hole with Korean hypocaust. Most of their cooking facilities were gas ranges using LPG. The most popular hot-water supply system was an oil boiler and the next was an electricity boiler. The amount of energy use in a rural household generally showed 20,000 to 40,000 won/month of the electric power rate, 400 to 800 liter/year of the oil and 60 to 120 kg/year of the LPG. Prompt measures should be taken to promote the spread of new and renewable energy such as solar heat, biomass and wind power, etc.

• Journal of Auto-vehicle Safety Association
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• v.12 no.3
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• pp.34-42
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• 2020

ADAS (Advanced Driver Assistance Systems) uses sensors such as camera, radar, lidar and GPS (Global Positioning System). Among these sensors, the camera has many advantages compared with other sensors. The reason is that it is cheap, easy to use and can identify objects. In this paper, therefore, a theoretical formula was proposed to obtain the distance from the vehicle's front wheel to the lane using a monocular camera. And the validity of the theoretical formula was verified through the actual vehicle test. The results of the actual vehicle test in scenario 4 resulted in a maximum error of 0.21 m. The reason is that it is difficult to detect the lane in the curved road, and it is judged that errors occurred due to the occurrence of significant yaw rates. The maximum error occurred in curve road condition, but the error decreased after lane return. Therefore, the proposed theoretical formula makes it possible to assess the safety of the LKA system.

• Journal of the Korean Society of Safety
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• v.34 no.4
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• pp.6-14
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• 2019

There are about 38,977 CNG cars and 247 natural gas vehicle charging stations in operation in order to improve the urban air environment. With the introduction of natural gas vehicles, the atmospheric environment, which was the main cause of air pollution in the metropolitan area, was remarkably improved. However, unlike these positive effects, CNG bus accidents, which occurred more than 10 times since 2005, have caused concern among the majority of citizens using public transportation. It is necessary to make a judgment on the feasibility and future direction of CNG pressure vessel safety management that can safeguard the safety of CNG pressure vessel at the time of starting. In this study, we investigates production and use of CNG vessel, the current status of safety management of CNG bus transportation companies & charging stations and then proposes measures to prevent accident recurrence and safety management based on the actual situation investigation and analysis.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.47-49
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• 2003

Automatic land use and land cover change (LUCC) detection via remotely sensed imagery has a wide application in the area of LUCC research, nature resource and environment monitoring and protection. Under the condition that one time (T1) data is existed land use and land cover maps, and another time (T2) data is remotely sensed imagery, how to detect change automatically is still an unresolved issue. This paper developed a land use and land cover class knowledge guided method for automatic change detection under this situation. Firstly, the land use and land cover map in T1 and remote sensing images in T2 were registered and superimposed precisely. Secondly, the remotely sensed knowledge database of all land use and land cover classes was constructed based on the unchanged parcels in T1 map. Thirdly, guided by T1 land use and land cover map, feature statistics for each parcel or pixel in RS images were extracted. Finally, land use and land cover changes were found and the change class was recognized through the automatic matching between the knowledge database of remote sensing information of land use & land cover classes and the extracted statistics in that parcel or pixel. Experimental results and some actual applications show the efficiency of this method.

• Korean Journal of Organic Agriculture
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• v.12 no.1
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• pp.1-21
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• 2004

If it does not underestimata the livestock feces, it is analyzed that thc potential energy of consumption is sufficient. If consequently economic value evaluation of the livestock feces, environmentally use, the use of opportune and proper quantity, the logistics system development which connected the transportation and scattering, environmentally plan of public control facilities for livestock feces as a precondition of livestock feces consuming is been sufficient, the livestock feces problem of both farmhouse and the area which occurs excessively will be solve more economically and will be the possibility resources more efficiently as chemical fertilizer transfer.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.4
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• pp.830-837
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• 2011

A turbine control system which has been operated for years in a nuclear power plant was retrofitted with a newly developed digital control system. After completion of the retrofit, turbine valve tests were performed to ensure the integrity of each valve's control function. The sequence of each valve test is composed of a closing process and a reopening process. To minimize megawatt variation which normally occurs during the test sequence, we employed a kind of compensator algorithm in the new digital control system which also have been used in the old system. There were difficulties finding optimal parameter settings for our new compensator algorithm because the power plant didn't allow us to perform necessary tuning procedures while the turbine is on load operation. Therefore an alternative measure for the compensator tuning which is independent of the turbine actual operation had to be implemented. So, a process model for the test was required to overcome this situation. We analyzed the operation data of the test and implemented the process model by use of input and output variable relations. Also we verified the process model by use of another condition's operating data. The result shows that the output of model is similar to the actual operation data.

• Journal of Korean Public Health Nursing
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• v.9 no.2
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• pp.17-32
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• 1995

The purpose of this study is to promote health for young female workers. It is based on questionnaires collected from 215 female workers in Incheon area. This study includes health condition (fatigue scores), occupational disease, knowledge of abused drugs and the actual condition of drug use. The results are summerized as follows: - $47.4\%$ visited their health center and were treated with diseases like cold and headache $(34.9\%)$, gastroenteric disease $(6.5\%)$, trauma $(7.9\%)$ and chronic disease such as diabetes and hypertension $(3.3\%)$ - $44.7\%$ received regular health education and $4.7\%$ among them received education on abused drugs. - $20.5\%$ were suffering from work related diseases such as gastroenteric disease, headache, trauma, repiratory disease, skin problem, arthritis, low back pain, shortsightness and tuberculosis. - Total mean fatigue score as an indication of health status was $9.0\pm5.4$ points out of 30 points. Physical mean score (group I) was $3.92\pm2.2$ points and psychological mean score was $2.5\pm2.3$ points and neurosensory mean score was $2.6\pm2.1$ points out of each 10 points. - They recognized analgesics $(55.0\%)$ and the next are laxatives $(49.8\%)$, inhalants $(40.0\%)$, narcotics $(24.2\%)$, stimulants $(24.0\%)$, antihistamines$(5.9\%)$, diuretics $(3.0\%)$, tranquilizer $(2.4\%)$ and sedatives $(1.4\%)$ - They used analgesics $(37.2\%)$ the most and then laxatives $(6.0\%)$, stimulants$(5.6\%)$, diuretics $(1.9\%)$, antihistamines$(0.5\%)$, And nobody used tranquilizer, sedatives, narcotics and inhalant. - The relationship between career, drug abuse education, health center utilization and and the actual condition of drug using was examined. The longer the career and the more educated with drug abuse, the less drug used. And those who utilized health center rarely used more drugs. - The relationship between career, health center utilization, the score of fatigue and use of analgesics was also examined. Those group who have a longer career above 3 years and the group who have never used health center used more analgesics. And the group of fatigue score above 11.0 points used a little more analgesics than the other group. These results indicate that analgesics are the most frequent used drugs among female workers. Those analgesics such as geborin, penzal, saridon, aspirin, tyrenol should be used properly. These basic data is submitted for the education and consultation which are carried out by industrial nurses for promoting health of industrial workers.