• Title/Summary/Keyword: Korea Standard

Search Result 20,387, Processing Time 0.047 seconds

Thermal and Non-thermal Heat Flow in a Large Crystal Detector for Neutrinoless Double Beta Decay Search

  • Kim, G.B.;Lee, S.J.;Jang, Y.S.;Lee, H.J.;Lee, J.H.;Lee, J.Y.;Lee, M.K.;Yoon, W.S.;Kim, Y.H.
    • Progress in Superconductivity
    • /
    • v.14 no.2
    • /
    • pp.87-91
    • /
    • 2012
  • Metallic magnetic calorimeters (MMCs) are one of the most competitive low temperature detector (LTD) readout sensors. They have the advantages of high time resolution, no heat dissipation, and a wide range of operating temperature. We apply MMCs to our neutrinoless double beta decay ($0v{\beta}{\beta}$) search experiment. A $CaMoO_4$ crystal was employed as both a source of $0v{\beta}{\beta}$ and an energy absorber. The crystal was thermally connected to a MMC sensor. We set a simple thermal model for this detector and measured pulse shapes are compared with a numerical solution of the thermal model.

A Study on Environmental Standards of School Building (교사환경기준에 관한 연구)

  • Hong, Seok-Pyo;Park, Young-Soo
    • The Journal of Korean Society for School & Community Health Education
    • /
    • v.1 no.1
    • /
    • pp.11-43
    • /
    • 2000
  • The purpose of this study was, through analyzing the previous researches, to grasp the present status of environment of school building(ESB), research the sundry records of each element and, through comparative analysis of the standard of ESB in Korea, the United States, and Japan, select the normative standard of ESB, to clarify the point at issue presented in Regulation of Construction & facility Management for Elementary and and Secondary School in Korea, and to suggest an alternative preliminary standard of ESB. To carry out a research for this purpose, these were required: 1. to investigate the existing present status of ESB, 2. to make a comparative analysis of the standard of ESB in each country, 3. to suggest the normative standard of preliminary standard of ESB, 4. to analyze the controversial points of the standard of ESB in Korea, 5. to suggest an alternative preliminary standard of ESB. The conclusions were as follows: 1. Putting, through analyzing the previous researches, the existing present status of ESB together, it seemed that lighting environment, indoor air environment and noise environment were all in poor conditions. 2. In the result of a comparative analysis of the standard of ESB in Korea, Japan and the United States, in Korea the factors of each lighting and indoor air environment were not presented properly, in Japan, in lighting environment aspect, the standard on natural lighting and the factors on brightness were not presented., and in the USA the essential factors of each environment were throughly presented. In the comparison of the standards on each factor, Korea showed that the standard level presented was less properly prescribed than those of the USA and Japan but it also showed that the standard levels prescribed in the USA and in Japan were mostly similar to the standard levels in records investigated. 3. With the result of the normative standard selection on School Builiding environment factor of prescribed in this study, the controversial points of the standard of ESB in Korea were analyzed and the result was utilized to suggest new preliminary standard of ESB. 4. As the result of the analysis of the controversial points of the standard of ESB in Korea, it was found that the standard of ESB in Korea should be established on a basis of School Health Act and be concretely presented in School Health Regulation and School Health Rule. The factors of each environment was improperly presented in the existing standard of ESB in Korea. Moreover the standard of them was inferior to that of the records investigated and those of in the USA and in Japan and it also showed that the standard of it in Korea was improper to maintain Comfortable Learning Environment. 5. A suggested preliminary standard of ESB acquired through above study as follows: 1) In this study a new kind of preliminary standard of ESB is divided into lighting environment, indoor air environment, noise environment, odor environment and for above classification, reasonable factor and standard should be established and the controling way on each standard and countermeasures against it should be considered. 2) In lighting environment, the factors of natural lighting are divided into daylight rate, brightness, glare. In the standard on each factor, daylight rate should secure 5% of a mean daylight rate and 2% of a minimum daylight rate, brightness ratio of maximum illumination to minimum illumination should be under 10:1, and in glare there should not be an occurrence factor from a reflector outside of the classroom. And the factors of unnatural lighting are illumination, brightness, and glare. In the standard on each factor, illumination should be 750 lux or more, brightness ratio should be under 3 to 1, and glare should not occur. And Optimal reflection rate(%) of Colors and Facilities of Classroom which influences lighting environment should be considered. 3) In indoor air environment factors, thermal factors are divided into (1) room temperature, (2) relative humidity, (3) room air movement, (4) radiation heat, and harmful gases (5) CO, (6) $CO_2$ that are proceeded from using the heating fuel such as oval briquettes, firewood, charcoal being used in most of the classroom, and finally (7) dust. In the standard on each factor, the next are necessary; room temperature: $16^{\circ}C{\sim}26^{\circ}C$(summer : $E.T18.9{\sim}23.8^{\circ}C$, winter: $E.T16.7{\sim}21.7^{\circ}C$), relative humidity: $30{\sim}80%$, room air movement: under 0.5m/sec, radiation heat: under $5^{\circ}C$ gap between dry-bulb temperature and wet-bulb temperature, below 1000 ppm of ca and below 10ppm of $CO_2$, dust: below 0.10 $mg/m^3$ of Volume of dust in indoor air, and ventilation standard($CO_2$) for purification of indoor air : once/6 min.(about 7 times/40 min.) in an airtight classroom. 4) In the standard on noise environment, noise level should be under 40 dB(A) and the noise measuring way and the countermeasures against it should be considered. 5) In the standard on odor environment, odor level under Physical Method should be under 2 degrees, and the inspecting way and the countermeasures against it should be considered.

  • PDF

Application Status and Its Affecting Factors of Double Standard for Multinational Corporations in Korea (산업안전보건 영역에서 다국적 기업의 이중 기준 적용실태와 영향요인)

  • Ki, Myung;Lee, June-Young;Park, Hee-Chan;Yoon, Seok-Joon;Kim, Nam-Hoon;Heo, Jung-Yeon;Choi, Jae-Wook
    • Journal of Preventive Medicine and Public Health
    • /
    • v.37 no.1
    • /
    • pp.17-25
    • /
    • 2004
  • Objectives : We intended to evaluate the double standard status and to identify factors of determining double standard criteria in multinational corporations of Korea, and specifically those in the occupational health and safety area. Methods : A postal questionnaire had been sent, between August 2002 and September 2002, to multinational corporations in Korea. A double standard company was defined as those who answered in more than one item as adopting a different standard among the five items regarding double standard identification. By comparing double standard companies with equivalent standard companies, determinants for double standards were then identified using logistic regression analysis. Results : Of multinational corporations, 45.1% had adopted a double standard. Based on the question naire's scale level, the factor of 'characteristic and size of multinational corporation' was found to have the most potent impact on increasing double standard risk. On the variable level, factors of 'number of affiliated companies' and 'existence of an auditing system with the parent company' showed a strong negative impact on double standard risk. Conclusion : Our study suggests that a distinctive approach is needed to manage the occupational safety and health for multinational corporations. This approach should be focused on the specific level of a corporation, not on a country level.

A Analysis on the Previous Research Trend of 'Minimum Housing Standard' ('최저주거기준'에 관한 국내 선행 연구경향 분석)

  • Hyun, Jiwon;Lee, Yeunsook;Ahn, Somi
    • Korean Institute of Interior Design Journal
    • /
    • v.26 no.4
    • /
    • pp.3-11
    • /
    • 2017
  • The appropriate area for human's most basic living space is an important factor. Therefore, the 'minimum housing standard' is a very important factor to ensure a minimum quality of living space for human life. In Korea, however, the importance of the 'minimum housing standard' has been neglected for about 20 years. Even in Korea, the 'minimum housing standard' has become an nominal existence. In other countries, studies have long been conducted on the minimum housing standards, but studies have shown that studies on the minimum housing standard are not actively occurring in Korea. The purpose of this study is to diagnose the current status of the 'minimum housing standard' in Korea and to explore the direction of future research. The study included a total of 29 researches commissioned by the Korea Academic Research Institute (KCI). To ensure the objectivity and reliability of the analysis, analyzed year of research, field of research, method of research, contents of research. Through this study, it is possible to grasp the tendency of previous studies on 'minimum housing standard' in Korea and it is meaningful to increase the usability of 'minimum housing standard' in residential planning. It is also expected that future research on 'minimum housing standards' will be able to present the direction of the field to be developed.

Estimating the Optimal Ratio of Standard Pallet Use for Logistics Standardization

  • Hong, Sung-Wook;Lee, Soon-Cheul
    • Journal of Korea Port Economic Association
    • /
    • v.22 no.1
    • /
    • pp.1-15
    • /
    • 2006
  • This paper analyzes how levels of logistics standardization are related to logistics costs. The study surveyed ratios of standard pallet use in order to measure levels of firms' standardization in logistics management. Research focused on how firms' logistics costs were related to their levels of logistics standardization and ratios of standard pallet use. After measuring use of standard pallets and logistics costs, optimal levels of logistics standardization were estimated based on survey data. Logistics costs and standardization were more related to labor than to freight volume or export. Results indicated that firms could reduce logistics costs by raising levels of logistics standardization; optimal levels of standard pallet use out of Korean firms' total manufacturing cargo volume were estimated at 44.26% for multi-standard pallets and 57.99% for a single standard pallet (a unit load system). The study demonstrated that adopting a single standard pallet results in better cost saving logistics systems than use of multi-standard pallet types. These results may explain why firms pursue standardization in logistics systems.

  • PDF

Development of Meander-shaped Metallic Magnetic Calorimeters

  • Yoon, W.S.;Jang, Y.S.;Kim, G.B.;Lee, H.J.;Lee, J.Y.;Lee, M.K.;Kim, Y.H.
    • Progress in Superconductivity
    • /
    • v.14 no.2
    • /
    • pp.102-105
    • /
    • 2012
  • We are developing meander-shaped metallic magnetic calorimeters using micro-fabrication methods. A planar Nb coil in a meander shape was fabricated on a Si substrate. The coil was designed to have a persistent current using a metal heater evaporated on a part of the coil. A paramagnetic sensor, $5{\mu}m$ thick Au:Er foil, was glued on top of the meander structure with epoxy. The magnetization and heat capacity were measured at different temperatures, and applied field currents matched well with expected values. The detector showed an energy resolution of 4 keV FWHM for the 5.5 MeV alpha particles.

The Study of Comparison with Industrial Standard of South-North Korea in Clothing (남.북한 의류 산업 표준에 관한 비교 연구)

  • 박지연;김용필;윤덕균
    • Journal of Korean Society of Industrial and Systems Engineering
    • /
    • v.26 no.4
    • /
    • pp.1-5
    • /
    • 2003
  • This paper is for standard of South and North Korea clothing, especially size. It is analysis and make a comparative study of KS K 0050-0052 which is South Korea industrial standard) and KPS 8477.1∼3, 8477.6, 8477.9, 10253 which is North Korea's. With this research, it is found the difference and sameness, then this paper suggests the method for combining two different standard systems.

Establishment of Work and Time Standards in Machining rations including NC Machines (NC기계들이 포함된 기계공작공정에서의 작업연구)

  • 유인선;오근태
    • Journal of Korean Society of Industrial and Systems Engineering
    • /
    • v.18 no.33
    • /
    • pp.11-27
    • /
    • 1995
  • This study sets a goal of establishing work standard and standard time in a machine tool process consisted of high-priced NC machine tools. Firstly, the theories of work standard and standard time in the field of NC machine tools are studies. Secondly, the theories are actually applied to a manufacturing company; work standard sheets are developed and applied to a machining center haying low operation rate, and then the increase in productivity is compared. Finally, problems to be studied later in relation to work standard and standard time are presented.

  • PDF

Measurement of Solar Cell Using LED-based Differential Spectral Responsivity Comparator under High Background Irradiance

  • Zaid, Ghufron;Park, Seong-Chong;Lee, Dong-Hoon;Park, Seung-Nam
    • Proceedings of the Optical Society of Korea Conference
    • /
    • 2009.02a
    • /
    • pp.293-294
    • /
    • 2009
  • The spectral responsivity of solar cells has been measured under high background irradiance using an LED-based differential spectral responsivity Comparator (DSR-C). The comparator developed is fully automated and has some advantages: It does not need a chopper to modulate the light. Unlike the conventional method, it does not require a monochromator to select wavelength. It covers a wavelength range up to 1200 nm. The wavelength range of the comparator is limited by the spectral power distribution of the LEDs and the spectral responsivity of the standard detector. An active temperature control was utilized to meet the specified standard conditions of solar cell test. This work shows the effect of different levels of background irradiance on the spectral responsivity and the importance of same background irradiance for solar cell test as specified by the corresponding standard.

  • PDF