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  • Title/Summary/Keyword: Nuclear industry

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Improvement of women's Education in Korea and their Employment (한국여성의 교육향상과 직장참여 - 학교교육과 직장생활의 성별차별)

  • 전희정
    • Journal of the Korean Home Economics Association
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    • v.11 no.4
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    • pp.414-423
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    • 1973
  • Before the modern education was introduced in Korea men had the opportunity to be educated. Women's education was limited to a small number of girls belonging to ruling class. It was the men who got a job to earn the money for the family. The customary law prohibited women from being employed. They were to stay at home engaged in household affairs. This phenomenon has undergone a change when modern education was adopted which gave women the equal opportunity in education. The modernization of the country required a lot of educated and skilled labour. Since 1945 when Korea was liberated from the Japanese colonial administration the modernization programme has been worked out in every field such as industry, education, culture and politics, etc. The traditional grand family was transformed to nuclear family. The migration took place from country to town. With the adoption of compulsory education in the primary school the schoolgirls are increased in great number. The number of girls has been increased every year in Middle Schools, High schools and Universities. Even if boys still outnumber girls in all education institutions, the rate of increase of girl students are higher than that of boy students. Accordingly women are given more opportunity than ever for the employment vis-a-vis men. The number of employed women has been increasing greatly in recent years inproportion to the acceleration of industrialization. The type of their job is also various and colorful ranging from factory worker to doctor and lawyer. There are some problems to be solved with respect to the improvement of women's education. The improved women's education should be reviewed light of the fact that inequality still exists between men and women in occupation and wages, and that women is required of good education contributable to the better Korean society.

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Operation and Maintenance of Spent Fuel Storage and Transport Casks (사용후핵연료 수송저장 용기의 운전 및 유지보수)

  • 구정회;서기석;정원명;유길성;박성원
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2004.06a
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    • pp.345-345
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    • 2004
  • The spent fuel transportation casks have used as one of the most essential component in the nuclear industry. And, the number of the cask has been significantly increased in recent years. While the bulk amount of spent fuel in the world is still kept in the storage pool, the number of countries which have chosen the advantages of dual purpose cask for transportation and storage is rapidly increasing. The technical experience in the area of spent fuel transportation cask operation and maintenance for long period is also available and will be well utilized also in storage casks. The increasing use of casks for dual and multiple purposes raises an issue of long term consideration by international standardization. Accordingly IAEA is providing a regulatory requirements and guidelines as an effort for this standardization.

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Performance Evaluation of a Selenium(a-Se) Based Prototype Digital Radiation Detector (비정질 셀레늄 기반 디지털 방사선 검출기의 성능 평가)

  • Park, Ji-Koon;Kang, Sang-Sik;Cho, Sung-Ho;Shin, Jung-Wook;Kim, So-Yeong;Son, Dae-Woong;Nam, Sang-Hee
    • Journal of Biomedical Engineering Research
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    • v.28 no.2
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    • pp.300-305
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    • 2007
  • In this study, we have studied the fabrication and the performance evaluation of digital radiation detector of the based on selenium (a-Se) prototype which is widely researched about recently. The detector was fabricated using amorphous selenium in the specification of active area size 7×8.5", pixel pitch 139μm, and 12 bit ADC. In order for the performance evaluation of the fabricated detector, we used radiation quality RQA 5 that is suggested by the International Electrotechnical Commission (IEC), and evaluated modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE). Concerning MTF measurement, we used slit camera (Nuclear Associates, Model : 07-624-2222), and evaluated in the slit method. Also so as to compare the performance evaluation on the detector fabricated in this study, we used Hologic Direct-Ray (DR-1000) and GE Revolution XQ/I system, and evaluated and compared in the same method MTF, NPS, and DQE which are image quality factors. And as a result, the MTF of each detector In Nyquist frequency were evaluated to be 58% (at 3.5 lp/mm) in the case of DR-1000 and 65% (at 2.5 lp/mm) in the case of XQ/I, and that for the detector fabricated in this study was evaluated to be 36% (at 3.51 lp/mm). Also in the case of DQE(0), the detector fabricated in this study, DR-1000 of Hologic company, and XQ/I system of GE company respectively were evaluated as 36%, 32%, and 50%.

Reevaluation of bactericidal, cytotoxic, and macrophage-stimulating activities of commercially available Fucus vesiculosus fucoidan

  • Nishiguchi, Tomoki;Jiang, Zedong;Ueno, Mikinori;Takeshita, Satoshi;Cho, Kichul;Roh, Seong Woon;Kang, Kyong-Hwa;Yamaguchi, Kenichi;Kim, Daekyung;Oda, Tatsuya
    • ALGAE
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    • v.29 no.3
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    • pp.237-247
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    • 2014
  • Polysaccharides prepared from marine algae sometimes contain contaminants such as polyphenols and endotoxins that may mislead their bona fide biological activities. In this study, we examined bioactive contaminants in commercially available fucoindan from Fucus vesiculosus, along with ascophyllan and fucoidan from Ascophyllum nodosum. F. vesiculosus fucoidan inhibited the growth of Vibrio alginolyticus in a concentration-dependent manner (01,000μgmL1). However, the antibacterial activity of the fucoidan significantly reduced after methanol-extraction, and the methanol-extract showed a potent antibacterial activity. The extract also showed cytotoxicity to RAW264.7 and U937 cells, and induced apoptotic nuclear morphological changes in U937 cells. These results suggest that the antibacterial activity of the fucoidan is partly due to the methanol-extractable contaminants that can also contribute to the cytotoxicity on RAW264.7 and U937 cells. On the other hand, the activities to induce secretion of nitric oxide and tumor necrosis factor-α from RAW264.7 cells were observed in the fucoidan even after methanol extraction, and the extract had no such activities. Our observations suggest that commercially available fucoidan should be purified prior to biochemical use.

Seventeen Unrecorded Species from Gayasan National Park in Korea

  • Lee, Hyun;Park, Myung Soo;Park, Ji-Hyun;Cho, Hae Jin;Park, Ki Hyeong;Yoo, Shinnam;Lee, Jun Won;Kim, Nam Kyu;Lee, Jin Sung;Park, Jae Young;Kim, Changmu;Kim, Jae-Jin;Lim, Young Woon
    • Mycobiology
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    • v.48 no.3
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    • pp.184-194
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    • 2020
  • Macrofungi play important roles in forest ecology as wood decayers, symbionts, and pathogens of living trees. For the effective forest management, it is imperative to have a comprehensive overview of macrofungi diversity in specific areas. As a part of the National Institute of Biological Resources projects for discovering indigenous fungi in Korea, we collected macrofungi in Gayasan National Park from 2017 to 2018. These specimens were identified based on morphological characteristics and sequence analysis of internal transcribed spacer (ITS) or the nuclear large subunit rRNA (LSU) region. We discovered 17 macrofungi new to Korea: Butyrea japonica, Ceriporia nanlingensis, Coltricia weii, Coltriciella subglobosa, Crepidotus crocophyllus, Cylindrobasidium laeve, Fulvoderma scaurum, Laetiporus cremeiporus, Lentinellus castoreus, Leucogyrophana mollusca, Marasmius insolitus, Nidularia deformis, Phaeophlebiopsis peniophoroides, Phanerochaete angustocystidiata, Phlebiopsis pilatii, Postia coeruleivirens, and Tengioboletus fujianensis. We described their detailed morphological characteristics.

Characterization of the Effects of Silver Nanoparticles on Liver Cell Using HR-MAS NMR Spectroscopy

  • Kim, Si-Won;Kim, So-Sun;Lee, Sang-Mi;Kwon, Bo-Bae;Choi, Jin-Hee;Hyun, Jin-Won;Kim, Suhk-Mann
    • Bulletin of the Korean Chemical Society
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    • v.32 no.6
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    • pp.2021-2026
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    • 2011
  • AgNPs (silver nanoparticles) has been widely used for the commercial products, which have antimicrobial agent, medical devices, food industry and cosmetics. Despite, AgNPs have been reported as toxic to the mammalian cell, lung, liver, brain and other organs and many researchers have investigated the toxicity of AgNPs. In this study, we investigated toxicity of the AgNPs to the liver cell using metabolomics based on HRMAS NMR (High Resolution Magic Angle Spinning Nuclear Magnetic Resonance) technics, which could apply to the intact tissues or cells, to avoid the sample destruction. Target profiling and multivariative statistical analysis were performed to analyze the 1D 1H spectrum. The results show that the concentrations of many metabolites were affected by the AgNPs in the liver cell. The concentrations of glutathione (GSH), lactate, taurine, and glycine were decreased and most of amino acids, choline analogues, and pyruvate were increased by the AgNPs. Moreover, the levels of the metabolites were recovered upto similar level of metabolites in the normal cell by the pre-treatment of NAC, external antioxidant. The results suggest that the depletion of the GSH by the AgNPs might induce the conversion of lactate and taurine to the pyruvate.

A characteristics study on the Second-harmonic generation conversion efficiency of Pulsed Nd:YAG Laser adopted Superposition multiple Mesh Networks (중첩다단 메쉬회로를 적용한 펄스형 Nd:YAG 레이저의 2차 고조파 변환효율에 관한 특성연구)

  • 김휘영
    • Journal of the Korea Computer Industry Society
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    • v.2 no.4
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    • pp.565-572
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    • 2001
  • At the most recent years, laser medical instruments, laser applications and laser nuclear fusion need strong visible light and ultraviolet rays. Nonlinear optical devices, such as harmonic generators and parametric oscillators, provide a means of extending the frequency range of available laser sources. Frequency conversion is a useful technique for extending the utility of high-power lasers. It utilizes the nonlinear optical response of an optical medium in intense radiation fields to generate new frequencies. These progresses have been used to generate high-power radiation in all spectral regions, from the ultraviolet to the far infrared. Optical parametric oscillators and amplifiers generate two waves of lower frequency They are capable of generating a range of wavelengths from a single frequency source, in some cases spanning the entire visible and near infrared regions. Consequently, in order to obtain the green light, the pulsed Nd:YAG laser using multiple-mesh PFN(Pulsed Forming Network) method with Nonlinear optical device was adopted. We compared the current pulseshapes with the laser output energy, and conversion efficiency.

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Intestinal anti-inflammatory activity of Sasa quelpaertensis leaf extract by suppressing lipopolysaccharide-stimulated inflammatory mediators in intestinal epithelial Caco-2 cells co-cultured with RAW 264.7 macrophage cells

  • Kim, Kyung-Mi;Kim, Yoo-Sun;Lim, Ji Ye;Min, Soo Jin;Ko, Hee-Chul;Kim, Se-Jae;Kim, Yuri
    • Nutrition Research and Practice
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    • v.9 no.1
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    • pp.3-10
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    • 2015
  • BACKGROUND/OBJECTIVES: Inflammatory bowel disease (IBD), including Crohn's disease and ulcerative colitis, involves chronic inflammation of the gastrointestinal tract. Previously, Sasa quelpaertensis leaves have been shown to mediate anti-inflammation and anti-cancer effects, although it remains unclear whether Sasa leaves are able to attenuate inflammation-related intestinal diseases. Therefore, the aim of this study was to investigate the anti-inflammatory effects of Sasa quelpaertensis leaf extract (SQE) using an in vitro co-culture model of the intestinal epithelial environment. MATERIALS/METHODS: An in vitro co-culture system was established that consisted of intestinal epithelial Caco-2 cells and RAW 264.7 macrophages. Treatment with lipopolysaccharide (LPS) was used to induce inflammation. RESULTS: Treatment with SQE significantly suppressed the secretion of LPS-induced nitric oxide (NO), prostaglandin E2 (PGE2), IL-6, and IL-1β in co-cultured RAW 264.7 macrophages. In addition, expressions of inducible nitric oxide synthase (iNOS), cyclooxygenase (COX)-2, and tumor necrosis factor (TNF)-α were down-regulated in response to inhibition of IκBα phosphorylation by SQE. Compared with two bioactive compounds that have previously been identified in SQE, tricin and P-coumaric acid, SQE exhibited the most effective anti-inflammatory properties. CONCLUSIONS: SQE exhibited intestinal anti-inflammatory activity by inhibiting various inflammatory mediators mediated through nuclear transcription factor kappa-B (NF-kB) activation. Thus, SQE has the potential to ameliorate inflammation-related diseases, including IBD, by limiting excessive production of pro-inflammatory mediators.

Systematic Evaluation of Fault Trees using Real-Time Model Checker (실시간 모델 체커를 이용한 풀트 트리의 체계적 검증)

  • 지은경;차성덕;손한성;유준범;구서룡;성풍현
    • Journal of KIISE:Software and Applications
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    • v.29 no.12
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    • pp.860-872
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    • 2002
  • Fault tree analysis is the most widely used saftly analysis technique in industry. However, the analysis is often applied manually, and there is no systematic and automated approach available to validate the analysis result. In this paper, we demonstrate that a real-time model checker UPPAAL is useful in formally specifying the required behavior of safety-critical software and to validate the accuracy of manually constructed fault trees. Functional requirements for emergency shutdown software for a nuclear power plant, named Wolsung SDS2, are used as an example. Fault trees were initially developed by a group of graduate students who possess detailed knowledge of Wolsung SDS2 and are familiar with safety analysis techniques including fault tree analysis. Functional requirements were manually translated in timed automata format accepted by UPPAAL, and the model checking was applied using property specifications to evaluate the correctness of the fault trees. Our application demonstrated that UPPAAL was able to detect subtle flaws or ambiguities present in fault trees. Therefore, we conclude that the proposed approach is useful in augmenting fault tree analysis.

Study on Space Composition Analysis of the Local Old Age Experience Hall (국내 노인생애체험전시관 공간구성에 관한 분석 연구)

  • Cho, Jung-Mi;Kim, Moon-Duck
    • Proceedings of the Korean Institute of Interior Design Conference
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    • 2006.05a
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    • pp.173-178
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    • 2006
  • An increase in the proportion of Korean population in older age is much faster than the rest of the world. Along with rise of nuclear family due to rapid industrialization, informatization and materialization, ageing, on current situation in Korea that a reality of being diminished consciousness involving the sense of filial piety, and of respect or honor for the elders, does mean that such topics in ageing have become sociocultural issues that a nation should get more deeply involved in caring later life of the elderly population in an official and obligatory manner. Under this circumstance, an exhibition space in the hall intended for experiencing the later life of the elderly will surely play the role of locomotive in the respect of education to understand aging adults, and to promote development of health and welfare industry, especially for older population, also in creating and developing a positive and desirable culture and environment. To implement design project concerned with the space for the elderly population in a more careful and effective manner, the features of the Old Age Experience Hall that will satisfy the requirements thereof and the space compositions as well as characteristics of three exhibition halls having already been operated were analyzed examining closely the current facing issues in this aging society and also investigating the aging process related to physical functions of older adults. Based on those analyses, this study was aimed to prepare an efficient and systematic theoretical foundation for planning space composition of the Old Age Experience Hall further having extracted basic directions for design from, which should be meticulously considered and reflected so as to make the Old Age Experience Hall function properly.

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