• Title/Summary/Keyword: 안전설비

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A Study on Contents for Safety Training of the Thermal Power Plant to be Applied by Story Viewing (스토리 뷰잉(Story-viewing)을 적용한 화력발전분야 안전교육 콘텐츠 연구)

  • Kim, Yoo-sik;Min, Seol-hui;Seong, Yun-hak;Park, Yeong-jae
    • Fire Science and Engineering
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    • v.30 no.3
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    • pp.62-66
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    • 2016
  • There have been happening small and big fires due to the various causes in the thermal power plants which are the high risk buildings with the high possibility of big sizes of accidents, so the people in the power plants distribute the workers "the site action manuals in thermal power plants" and try to minimize the rate of disasters like fires through the regular education and training. However, in the Five Thermal Power Plants in Korea, there are no the standard of "the site action manuals" and Furthermore, the present educational manuals are mostly the hard copies with poor readability. So the standardization of the manuals are definitely needed. Therefore, in this research, we proceed the standardization of the manuals for the five areas of the site action manual s in the thermal power plants which are oil fires, electric fires, building fires, facility fires and gas leaking reaction SOP to improve the reaction power on the disasters in the power plants which are the national significant infrastructures, thus by using the manual, we propose the safety education contents for the thermal power plants based on the visualization technology using story-viewing method to complement the hard copy type disaster manuals.

Field Test and Performance Verification of On-board Oriented Train Control System (차상중심 열차제어시스템의 현장시험을 통한 성능검증)

  • Baek, Jong-Hyen
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.8
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    • pp.5513-5521
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    • 2015
  • There is an operational efficiency problem about wayside equipment applied to the domestic low-density branch as the equipment has been installed and operated similarly in the mainline. On-board oriented train control system, which has been developed for train safety and operation efficiency, ensures safe train operation without expensive ground control signal devices. Such system consists of on-board control system, wayside control system, and local control system. In this paper, the details of tests such as suitability test, communication test, and interface test are described by installing the on-board control system and wayside control system in field. Installation tests include checking power, voltage, cable connection, LED status, etc. Field applicability of the developed system is also verified through the dynamic operation tests with diverse scenarios, which are performed on the virtual line similar to the real environment including switch machine and level crossing gate. Dynamic operation tests were conducted for total 7 scenarios, and several tests were repeated for each scenario. The elapsed time for each operation was computed by analyzing main process log, and we could check that each operation was accomplished within several seconds. Furthermore, the developed system was verified through field test with an accredited institute, and testing certificates were issued.

A Survey on the Sanitary Management in Food Service Institutions (집단급식소의 위생관리에 대한 실태 조사)

  • Soh, Gowan-Soon;Kim, Yong-Suk;Shin, Dong-Hwa
    • Journal of Food Hygiene and Safety
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    • v.22 no.1
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    • pp.63-75
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    • 2007
  • A survey on sanitary management at 98 food service institutions located in Jeollabuk-Do were conducted. Food service institutions included 13 hospitals, 38 schools, 40 enterprises, and 7 others. The sterilization in boiling water was used for disinfection of tableware, spoon and chopsticks, and dish towel. Cooking kit, refrigerator, chopping board, and knife were sterilized with disinfectant. Frequency of sanitary training program on employees was 56.1% for 1 time/month, 12.2% for 2-3 times/month, and 11.3% for 1 time/week. Preparing ratio of defrosting, warehouse and rest room, and washing and sterilization diary were 73.8, 60.5, and 54.5%, respectively. However, checking ratio of environments (9.5%), personal sanitation (10.8%), and sanitary training program diary(8.4%) were low. Major obstacle factors on the introduction of Hazard analysis critical control point (HACCP) system into food service institutions were lack of equipment and facilities (54.1%) and lack of understanding and data on HACCP system (17.3%). Therefore, in order to reduce the outbreak of food-borne diseases increasing frequency, we estimated that the introduction of sanitary management system and the conversion of dietician' perception on sanitary managements in food service institutions were needed.

Evaluation of the Level of microbial Contamination in the Processing Company of Nuroong-ji (누룽지 생산시설에 대한 미생물학적 오염도 평가)

  • Do, Yu-No;Choi, Jeong-Sik;Jung, Yu-Kyung;Park, Ji-Hyun;Roh, Kyong-Hwan;Kim, Sung-Soo;Choi, Shin-Young;Lee, Kyoung-Yun;Han, Eui-Jeong
    • Journal of Food Hygiene and Safety
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    • v.25 no.4
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    • pp.333-340
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    • 2010
  • This study was conducted to evaluate the microbial contamination levels in the processing company of Nuroong-ji. Microbial contamination levels were examined for sanitary indication bacteria such as aerobic plate count, coliforms and fungi, and pathogenic bacteria such as Escherchia coli O157:H7, Salmonella spp., Staphylococcus aureus, and Listeria monocytogenes. Contamination levels were detected differently according to handling materials and purposing work-space. The equipments and raw materials were not seriously contaminated but there were necessary to attend the cross-contamination. A high contamination level was detected at the process where the interference of the employees was relatively higher than the other process. Standardization of the roasting process (l20~$170^{\circ}C$, about 10 min) could be necessary to control the microbial organism effectively on Nuroong-ji manufacturing process. At small/medium size foodstuff manufacturers, it is the most important to improve the recognition level of individual hygiene but also expand a hygiene facility.

A Study on the Explosion Hazardous Area in the Secondary Leakage of Vapor Phase Materials Based on the Test Results and the Leak Rate According to SEMI S6 in the Semiconductor Industry (반도체 산업의 SEMI S6에 따른 실험결과 및 누출률을 기준으로 한 증기 상 물질의 2차 누출 시 폭발위험장소에 관한 연구)

  • Kim, Sang Ryung;Lim, Keun Young;Yang, Won Baek;Rhim, Jong Guk
    • Journal of the Korean Institute of Gas
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    • v.24 no.2
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    • pp.15-21
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    • 2020
  • Currently, in KS C IEC 60079-10-1, the leakage hole radius of secondary leakage is expressed as a recommendation. Underestimation of leak hole size can lead to underestimation of the calculated values for leak rates, and conservative calculations of leak hole sizes, which are considered for safety reasons, can be overestimated, resulting in an overestimated risk range. This too should be avoided. Therefore, a careful and balanced approach is necessary when estimating the size of leaking holes.Based on this logic, this study examines the stability by grasping the concentration inside the gas box when leaking dangerous substances as a result of experiments based on SEMI S6, an international safety standard applied in the semiconductor industry and The scope of explosion hazardous area was determined by applying the formula of KS C IEC 60079-10-1 according to SEMI F15 leak rate criteria and SEMI S6 leak rate criteria. Based on this, we will examine whether the exhaust performance needs to be improved as an alternative to FAB facilities that are difficult to apply to explosion hazards such as semiconductor industry.

The Valuation of HSA Business Using Broadband over Power Line (전력선통신망을 이용한 HSA사업의 경제적 타당성 분석)

  • Lyoo, Tae-Ho;Kim, Chang-Seob
    • Journal of Energy Engineering
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    • v.16 no.4
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    • pp.202-214
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    • 2007
  • The concept of HSA (Home Service Aggregator) is derived from performing the energy IT business efficiently as well as successfully launcing a new service based on BPL (Broadband over Power Line). The HSA business using a BPL can extend the field of energy industry and an give a chance to create a new demand by consumer-oriented services. This study focuses on the exact evaluation of HSA business using BPL, and reasonable trusty evaluation should be the first step to launch the HSA business. In this study, the categories of cost are comprised of equipment (mainly RSM and MGW) cost, instalation cost, and maintenance cost. AMR (Automatic Meter Reading), internet integration billing service, integration charging service, internet service, sorority service, and electricity safety are listed for benefit. In this study, the ROI of HSA business is 0.9594, which is less than 1. However, that value does not consider the electricity safety benefit which is classified as a social benefit. Therefore, the value can be above 1 if it includes social and private benefits.

Thermal Analysis of a Retrievable CANDU Spent Fuel Disposal Tunnel (회수 가능 CANDU 사용후핵연료 처분터널에 대한 열 해석)

  • Cha, Jeong-Hun;Lee, Jong-Youl;Choi, Heui-Joo;Cho, Dong-Keun;Kim, Sang-Nyung;Youn, Bum-Soo;Ji, Joon-Suk
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.6 no.2
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    • pp.119-128
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    • 2008
  • Thermal assessment of a new CANDU spent fuel disposal system, which improves the retrievability of the spent fuel and enhances the densification factor compared with the Korean Reference disposal System, is carried out in this study. The canisters for CANDU spent fuels are stored for long term and cooled by natural convection in the proposed disposal system for the retrievability. The steady state thermal analyses for proposed CANDU disposal system are carried out with the ANSYS 10.0 CFX code. The thermal analyses are performed through two steps. At the first step, the sensitivity of the disposal tunnel spacing is analysed. The differences of maximum temperatures by several tunnel spacings are calculated at three points in the disposal tunnel. The result shows that the differences of the temperature at the three points are almost negligible because 99% of the decay heat is removed by natural convection. At the second procedure, 60m tunnel spacing with a ventilation system instead of natural convection is considered. The result is applied to the calculation of the canister surface temperature in disposal tunnel as boundary conditions. Consequently, the average and the maximum surface temperature of disposal canisters are $79.9^{\circ}C$ and $119^{\circ}C$, respectively. The inner maximum temperature of a basket in the disposal canister is calculated as $140.9^{\circ}C$. The maximum temperature of the basket meets the thermal requirement for the CANDU spent fuel cladding.

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Preprocessing-based speed profile calculation algorithm for radio-based train control (무선통신기반 열차간격제어를 위한 전처리 기반 속도프로파일 계산 알고리즘)

  • Oh, Sehchan;Kim, Kyunghee;Kim, Minsoo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.9
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    • pp.6274-6281
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    • 2015
  • Radio-based train control system has driving headway shortening effect by real-time train interval control using two-way radio communication between onboard and wayside systems, and reduces facility investment because it does not require any track-circuit. Automatic train protection(ATP), the most significant part of the radio-based train control system, makes sure a safe distance between preceding and following trains, based on real-time train location tracing. In this paper, we propose the overall ATP train interval control algorithm to control the safe interval between trains, and preprocessing-based speed profile calculation algorithm to improve the processing speed of the ATP. The proposed speed profile calculation algorithm calculates the permanent speed limit for track and train in advance and uses as the most restrictive speed profile. If the temporary speed limit is generated for a particular track section, it reflects the temporary speed limit to pre-calculated speed profile and improves calculation performance by updating the speed profile for the corresponding track section. To evaluate the performance of the proposed speed profile calculation algorithm, we analyze the proposed algorithm with O-notation and we can find that it is possible to improve the time complexity than the existing one. To verify the proposed ATP train interval control algorithm, we build the train interval control simulator. The experimental results show the safe train interval control is carried out in a variety of operating conditions.

Preferences of Stroke Patients for Kitchen Environment in Residential Space (주거공간의 부엌 환경 특성에 대한 뇌졸중 환자의 선호)

  • Baek, Da-Rae;Jung, Yeon-Jin;Kang, Suk-Gu;Kim, Hee-Jung;Lee, Chun-Yeop
    • The Journal of Korean society of community based occupational therapy
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    • v.4 no.2
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    • pp.1-10
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    • 2014
  • Objective : The purpose of this study was to investigate the preferences of kitchen environment for stroke patients. Methods : The subjects of this study were 97 who have experience in rehabilitation therapy at hospitals in Busan. A questionnaire was distributed and collected from February 24th to March 13th, 2014. Descriptive statistics of frequency Study were used to analyze data. Results : First, the subjects demand for improvement that use a chair for work and install non-slip tiles. Second, they preferred the non-slip mat, boilers in heating equipment, drawer storage, L-shaped safety handle, adjustable sink of the height, automatic cutout of gas leak, faucet of touch-sensitive type, ㄷ-shaped kitchen and the ceiling-type hood in ventilation system. Third, they need kitchen items such as the sink self coming down, scissors for slices and knife to avoid hand injury. Conclusion : This study would contribute to kitchen environment for fall prevention and ease in use.

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Modified Empirical Formula of Dynamic Amplification Factor for Wind Turbine Installation Vessel (해상풍력발전기 설치선박의 수정 동적증폭계수 추정식)

  • Ma, Kuk-Yeol;Park, Joo-Shin;Lee, Dong-Hun;Seo, Jung-Kwan
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.27 no.6
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    • pp.846-855
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    • 2021
  • Eco-friendly and renewable energy sources are actively being researched in recent times, and of shore wind power generation requires advanced design technologies in terms of increasing the capacities of wind turbines and enlarging wind turbine installation vessels (WTIVs). The WTIV ensures that the hull is situated at a height that is not affected by waves. The most important part of the WTIV is the leg structure, which must respond dynamically according to the wave, current, and wind loads. In particular, the wave load is composed of irregular waves, and it is important to know the exact dynamic response. The dynamic response analysis uses a single degree of freedom (SDOF) method, which is a simplified approach, but it is limited owing to the consideration of random waves. Therefore, in industrial practice, the time-domain analysis of random waves is based on the multi degree of freedom (MDOF) method. Although the MDOF method provides high-precision results, its data convergence is sensitive and difficult to apply owing to design complexity. Therefore, a dynamic amplification factor (DAF) estimation formula is developed in this study to express the dynamic response characteristics of random waves through time-domain analysis based on different variables. It is confirmed that the calculation time can be shortened and accuracy enhanced compared to existing MDOF methods. The developed formula will be used in the initial design of WTIVs and similar structures.