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A Study for Development and Characteristics of Electrostatic Eliminator Suitable for the Super Clean Room Less than Class 100(I) (공기 청정지역(Class 100 이하)에 적합한 정전기 제거장치의 개발 및 특성에 관한 연구(I) - LCD 제조 공정을 중심으로 -)

  • Jung, Yong-Chul;Park, Hoon-Kyu;Lee, Dong-Hoon
    • Journal of the Korean Society of Safety
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    • v.21 no.4 s.76
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    • pp.60-65
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    • 2006
  • It is a well known fact that LCD is a central part of the IT industry which is important in the present and the future. But the biggest problem of LCD manufacturing is maintaining a cleaning room environment and administration. Therefore the purpose of this study is to first, prevent the yield depreciation and damage of products, and second, protect the worker ftom accidental electrostatic discharge during LCD manufacture. The soft x-ray ionizer is a type of electrostatic reducer device. It protects against electrostatic discharge in the cleaning room environment and is a necessary environmental factor during LCD production. The positive aspects of the soft x-ray are its shorter time and wider angle of exposure. But the negative aspect of the soft x-ray is its need for several shielding of protection from the harmful x-ray exposure. On this study, the development of the Air Nozzle-type ionizer to amend and refine some problems. For example, examined the electrostatic reduce device of a soft x-ray type and discovered the ion did not go inside well. also workers to be free from danger. An Air Nozzle-type ionizer is comprised of soft x-ray radiation and ionized air production. Air is injected through the nozzle after being ionized from radiation. It supplies air keeping the same pressure into the end foundation of ion production. The soft x-ray is the structure which radiates ionized air through the nozzle (21 holes) having micro holes of the ionizable radiation after ionizing the inside air by the ion production. A worker does not need a cover to protect against x-rays and the Air Nozzle-type ionizer is easy to set up and is more effective at eliminating electrostatic.

Effect of Gamma Irradiation on Anti Nutritional Factors and Nutritional Value of Canola Meal for Broiler Chickens

  • Gharaghani, Hossein;Zaghari, Mojtaba;Shahhosseini, Gholamreza;Moravej, Hossein
    • Asian-Australasian Journal of Animal Sciences
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    • v.21 no.10
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    • pp.1479-1485
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    • 2008
  • Two completely randomized block design experiments were conducted to evaluate the effect of gamma irradiation processing of canola meal on performance parameters of broiler chicks (Ross 308) and protein quality of canola meal. Protein efficiency ratio (PER) and net protein ratio (NPR) were measured as indices of canola meal protein quality. Samples of canola meal were tested for nutritional value after being irradiated at dose levels 10, 20 and 30 kGy. Glucosinolate content was reduced 40, 70 and 89 percent at irradiation dose levels of 10, 20 and 30 kGy respectively (p<0.01). Percent of erucic acid in total fatty acid content increased 44, 58 and 48% as a function of radiation dose (p<0.01). Dose levels did not affect feed conversion ratio (FCR) and body weight gain of chicks (p>0.05). Liver weight was decreased by irradiation dose (p<0.05). The same trend was observed for kidney weights, but this trend was not significant (p>0.05). Gamma irradiation processing of canola meal had no significant effect on T3 level in blood of chickens that consumed canola meal, but T4 level of chicken blood at the 30 kGy dose decreased significantly (p<0.05). PER and NPR were not affected by radiation dose level (p>0.05). Gamma irradiation seems to be a good procedure to improve the nutritional quality of canola meal.

Antifungal Effect of Triglycerol Monolaurate Synthesized by Lipozyme 435-Mediated Esterification

  • Zhang, Song;Xiong, Jian;Lou, Wenyong;Ning, Zhengxiang;Zhang, Denghui;Yang, Jiguo
    • Journal of Microbiology and Biotechnology
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    • v.30 no.4
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    • pp.561-570
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    • 2020
  • This study was designed to synthesize triglycerol monolaurate (TGML) with Lipozyme 435 as the catalyst, and explore its effects on the growth of Aspergillus parasiticus (A. parasiticus) and Aspergillus flavus (A. flavus) and the secretion of aflatoxin b1. The highest content of TGML (49.76%) was obtained at a molar ratio of triglycerol to lauric acid of 1.08, a reaction temperature of 84.93℃, a reaction time of 6 h and an enzyme dosage of 1.32%. After purification by molecular distillation combined with the washes with ethyl acetate and water, the purity of TGML reached 98.3%. Through characterization by electrospray-ionization mass spectrometry, infrared spectrum and nuclear magnetic resonance, the structure of TGML was identified as a linear triglycerol combined with lauroyl at the end. Finally, the inhibitory effects of TGML on the growths of A. parasiticus and A. flavus and the secretion of aflatoxin b1 were evaluated by measuring the colony diameter, the inhibition rate of mycelial growth and the content of mycotoxin in the media. The results indicated that TGML had a stronger inhibitory effects on colony growth and mycelial development of both toxic molds compared to sodium benzoate and potassium sorbate, and the secretions of toxins from A. parasiticus and A. flavus were completely suppressed when adding TGML at 10 and 5 mM, respectively. Based on the above results, TGML may be used as a substitute for traditional antifungal agents in the food industry.

Abalone Haliotis discus hannai Intestine Digests with Different Molecule Weights Inhibit MMP-2 and MMP-9 Expression in Human Fibrosarcoma Cells

  • Nguyen, Van-Tinh;Qian, Zhong-Ji;Jung, Won-Kyo
    • Fisheries and Aquatic Sciences
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    • v.15 no.2
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    • pp.137-143
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    • 2012
  • The abalone Haliotis discus hannai, is one of the economically important species in the fisheries industry. Abalone intestines are one of the by-products of its processing. To investigate its bioactive potential, abalone intestine was digested using an in vitro gastrointestinal (GI) digestion system containing pepsin, trypsin, and α-chymotrypsin. The abalone intestine G1 digests (AIGIDs) produced by the GI digestion system were fractionated into AIGID I (> 100 kDa), AIGID II (10-100 kDa), and AIGID III (1-10 kDa) using an ultrafiltration membrane system. Of the three digests, AIGID II and AIGID III exhibited inhibitory effects against matrix metalloproteinase-2 and -9 (MMP-2, MMP-9) in HT1080 human fibrosarcoma cells. Both fractions potently inhibited gelatine digestion by MMP-2 and MMP-9 treated with phorbol 12-myristate 13-acetate (PMA) and migration of HT1080 cells in dose dependently. Furthermore, AIGID II and III attenuated expression of p65, a component of nuclear transcription factor kappa B. These results indicate that of the abalone intestine digests inhibit MMP-2 and MMP-9. Thus, the AIGIDs or their active components may have preventive and therapeutic potential for diseases associated with MMP-2 and MMP-9 activation in fibrosarcoma cells.

Protective effect of methanol extract from citrus press cakes prepared by far-infrared radiation drying on H2O2-mediated oxidative damage in Vero cells

  • Wijesinghe, W.A.J.P.;Senevirathne, Mahinda;Oh, Myung-Cheol;Jeon, You-Jin
    • Nutrition Research and Practice
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    • v.5 no.5
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    • pp.389-395
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    • 2011
  • In the present study, a suitable drying method was developed for citrus press cakes (CPCs), which are produced as a by-product in citrus juice plants, and the protective effect of methanol extract of CPCs prepared by far-infrared radiation (FIR) drying against H2O2-induced DNA damage was evaluated versus that of freeze-dried CPCs. Methanol extract of FIR-dried CPCs exhibited comparatively good ROS scavenging activity versus the freeze-dried CPCs at the concentration of 100 μg/mL. The extract strongly enhanced the cell viability against H2O2-induced oxidative damage in Vero cells. Lipid peroxidation inhibitory activity of the extract from FIR-dried CPCs was comparable to that of the extract from freeze-dried CPCs. This sample also exhibited good protective effects against H2O2-mediated cell apoptosis as demonstrated by decreased apoptotic body formation in the nuclear staining with Hoechst 33342. In the comet assay, the CPC extracts exhibited strong inhibitory effects against H2O2-mediated DNA damage in a dose-dependent manner. Thus, this study demonstrated that FIR drying effectively preserves CPC as a functionally important natural antioxidant source and the FIR drying can be adapted for drying CPCs and is more economical for massive production than freeze drying.

FUNDAMENTAL UNDERSTANDING OF CRACKING AND BULGING IN COKE DRUMS

  • Penso, Jorge;Tsai, Chon
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.675-680
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    • 2002
  • Cracking and bulging in welded and internally lined pressure vessels that work in thermal-mechanical cycling service have been well known problems in the petrochemical, power and nuclear industries. However, published literature and industry surveys show that similar problems have been occurring during the last 50 years. A better understanding of the causes of cracking and bulging causes is needed to improve the reliability of these pressure vessels. This study attempts to add information required for increasing the knowledge and fundamental understanding required. Typical examples of this problem are the coke drums in the delayed coking units refinery process. This case was selected for experimental work, field study and results comparison. Delayed coking units are among the refinery units that have higher economical yields. To shut down these units represents a high negative economical impact in refinery operations. Also, the maintenance costs associated with repairs are commonly very high. Cracking and bulging occurrences in the coke drums, most often at the weld areas, characterize the history of the operation of delayed coking units. To design and operate more robust coke drums with fewer problems, an improved metallurgical understanding of the cracking and bulging mechanisms is required. A methodology that is based field experience revision and metallurgical analyses for the screening of the most important variables, and subsequent finite element analyses to verify hypotheses and to rank the variables according to their impact on the coke drum lives has been developed. This indicated approach provides useful information for increasing coke drum reliability. The results of this work not only order the most important variables according to their impact in the life of the vessels, but also permit estimation of the life spans of coke drums. In conclusion, the current work shows that coke drums may fail as a combination of thermal fatigue and other degradation mechanisms such as: corrosion at high and low temperatures, detrimental metallurgical transformations and plastic deformation. It was also found that FEA is a very valuable tool for understanding cracking and bulging mechanisms in these services and for ranking the design, fabrication, operation and maintenance variables that affect coke drum reliability.

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A Study on the Knowledge Management System based on Job Standards of Social Worker in Elderly Care Facilities (노인요양시설의 사회복지사 직무 표준 기반의 지식관리 시스템에 관한 연구)

  • Lee, Tae-Hi;Park, Koo-Rack;Kim, Dong-Hyun
    • Journal of the Korea Convergence Society
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    • v.8 no.11
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    • pp.71-76
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    • 2017
  • Our society is showing rapid growth throughout the industry, but it is in the era of nuclear family and aging. Due to the elderly, the demand for social welfare services such as medical treatment services tends to increase sharply. However, duties of senior citizens and social workers engaged in related medical care facilities are not clearly identified, and job stress has occurred and the degree of job satisfaction is extremely low. Therefore, in this paper, in relation to the social worker's duties of elderly nursing home care facilities, in practicing welfare services, knowledge base that was convergence with duties so that you can focus on service according to better environment and standardized procedures To provide a management system. Through the proposed system, social workers are expected to be able to improve work satisfaction by quickly grasping operations and escaping from job stress through their own development and information sharing.

Evaluations of Hydrogen Embrittlement Behaviours on Dissimilar Welding Part of SDS Bottles (I) (삼중수소 저장용기 이종용접부의 수소취화 거동 평가 (I))

  • Cho, Kyoungwon;Choi, Jaeha;Jang, Minhyuk;Lee, Youngsang;Hong, Taewhan
    • Journal of Hydrogen and New Energy
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    • v.26 no.2
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    • pp.114-119
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    • 2015
  • Nowdays, fossil fuels have been used as an important resource in development of industry. But it is limited and caused climate change such as pollution and global warming. So nuclear fusion research is being issued with tritium to develop eco-friendly and sustainable energy. Republic of Korea is in charge of Storage and Delivery System (SDS) in the International Thermonuclear Experimental Reactor (ITER), weld present in the SDS bottles are easily exposed to the hydrogen embrittlement of special characteristics of the hydrogen in hydrogen atmosphere, When the hydrogen embrittlement is rapidly progresses, the cracking is generated in the weld zone. Due to this cracking, the risk of leakage of tritium into the atmosphere occurs. In this study, hydrogen heat treatment was processed through the Pressure-Composition-Temperature (PCT) device according to the time variation. Also mechanical properties such as rupture strength test, three point bend test and hardness test in accordance with the respective time have been conducted and the fracture was observed by scanning electron microscopy(SEM) after the mechanical properties evaluation.

A Study on the Problems and Improvements of Free Infant Care Policy (영유아 무상보육 확대정책에 따른 문제점 및 개선방안에 관한 연구)

  • Kim, Un-Sam;Kim, Il-Tae
    • Industry Promotion Research
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    • v.5 no.2
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    • pp.59-69
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    • 2020
  • Recognizing the importance of early childhood education, the government is preparing measures at the national level, including expanding the scope of free education for infants, linking early childhood education to elementary schools, unifying the system in charge of early childhood education, printing the cost of operating a full-time system for double-income couples, and policies for low-income infants. In Korea's childcare policy, the need for childcare has increased due to the increase of free double-income couples, the increase of nuclear families, and the increase of divorce rates. Despite the overall increase in the child care budget, Korea's child care policy shows many problems in its efficiency due to the burden of childcare facilities and childcare fees for caregivers. After looking into the theoretical contents of the free childcare policy and the corresponding child care support policy, we would like to consider ways to improve the free childcare policy.

A Study on Work and Family Life of Married Female Production Workers and Policy Implications(1) (대구지역 생산직 기혼 여성의 취업 및 가족 생활실태파악과 대책수립에 관한 연구 (1))

  • 유가효
    • Journal of the Korean Home Economics Association
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    • v.29 no.3
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    • pp.227-246
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    • 1991
  • The study examined work and family life of married women employed in a manufacturing industry. Data were gathered from the use of face-to-face interview method from a sample of 230 married working women. The major findings of this study can be summarized as follows: (1) Most of the respondents found the work repetitive and unappealing, with the double burden of a paid work and housework. Thus, it is necessary for the government to implement social policies for married working women, such as establishment of various child care centers, part-time jobs, and dissemination of egalitarian sex-role attitudes. (2) More than half of the respondents were born in rural areas and immigrated to the urban sectors, forming a nuclear family structure. Most of these women were married with love, but some of them could not have a marriage ceremony because of the economic reasons. Thus, it may be necessary to increase the service centers to offer a free marital ceremony. (3) About 30% of the respondents answered they left their preschool aged children unattended, after dismissing from a kindergarden on a private institution. It was shown that working women, even though they were in charge of child-rearing, did not have an effective mechanism to control or protect their children while they were away from home. Most of them frequently used material compensations from their children in order to make up their absence at home. (4) It was found that the strategy for working women to decrease a dual-role conflict is to make a hierachy on the work they to do and to do only basic housework for everyday life and to do the rest of work on a off-day.

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