• Proceedings of the Korea Concrete Institute Conference
• /
• 2002.10a
• /
• pp.11-16
• /
• 2002

The production of Portland cement involves maximum use of resources and energy, which leads to destruction of tile ecological environment, raising in serious environmental issues such as acid rain and the greenhouse effect. In order to combat the arising problems associated with Portland cement, it thus is necessary that a non-clinker cement should be developed. In this study, non-clinker cement is produced by blending granulate blast furnace slag with phosphogypsum as main materials, and small amounts of hydrate lime or waste lime as activators. This paper aims to investigate compressive strength according to various condition of mixing ratio, blame, W/C ratio and curing temperature. Compressive strength of non-clinker cement increases continuously according to increase in curing age and blain. Although the compressive strength is fairly comparable to that of OPC in the early curing age, it reaches a higher lever in the later age than that of OPC due to the optimum mixing ratio and the continuous reaction of slag and phosphogypsum. Results obtained from this study have shown that non-clinker cement could be used as a replacement of OPC.

• 한국경영정보학회:학술대회논문집
• /
• 2007.11a
• /
• pp.284-293
• /
• 2007

In the present competitive organizational environment more organizations are implementing knowledge management initiatives to gain strategic advantage. One such initiative is that of implementing electronic knowledge repositories (EKR) which often leads to a rapid increase in the quantity of information employees have to process daily; raising concerns of employees being overloaded. This is especially true for current EKRs using distributive technology, enabling customizable individual workspaces which can result in loose knowledge structures. This paper identifies a new type of information overload (IO), extending the concept as occurring in both knowledge seekers and contributors and uses cognitive dissonance theory to provide evidence that IO can change employees' perception of EKR usage. This research paper provides the first empirical evidence that overload has no sufficient affect on EKR continuance intention directly, but has significant negative affect on the two main success measures; perceived usefulness and satisfaction of the system.

• Journal of Power System Engineering
• /
• v.20 no.4
• /
• pp.38-43
• /
• 2016

Safety-related equipments of Nuclear Power Plants(NPP) have to perform environmental qualification test in accordance with IEEE-323 standards. However, non-metallic materials replace new one regularly instead of the test because they are considered as consumable parts. In this study, the seven kinds of non-metallic materials are selected and their activation energy was experimentally evaluated with uncertainty analysis by using thermogravimetric analyzer(TGA). In order to obtain activation energy of non-metallic materials, mass difference, temperature raising rate and conversion rate on the specimen are analyzed. It is postulated that the three experiment conditions are important to get a reliable activation energy. This postulate was experimentally confirmed using Arrhenius equation and Flynn-Wall-Ozawa analysis.

• Journal of environmental and Sanitary engineering
• /
• v.20 no.1 s.55
• /
• pp.40-54
• /
• 2005

This dissertation aims to develop adsorption tubes for measuring organic solvents in the working environment, by comparing and analyzing breakthrough condition and adsorption capacity with ACF. 1. In breakthrough characteristics, the raising velocity of breakthrough curve is increasing according to assault concentration, but $50\%$ breakthrough time is decreasing. As breakthrough curve of calculated data using this agrees with the one of experimental data both of them can be used on determining sampling time of adsorption tubes. It is predicted by theoretical that $10\%$ breakthrough time is increasing in the case of increasing filled adsorbent amount. 2. $10\%$ breakthrough time is regularly decreasing as much as assault concentration is increasing. As a result, we can predict the life of adsorbent within the range of the low concentration, and adsorption amount that ACF can sample during $10\%$ breakthrough time is increasing as much as assault concentration is increasing.

• Journal of the Korean Society of Safety
• /
• v.14 no.2
• /
• pp.140-147
• /
• 1999

Currently, the consumer pattern is directed to small quantity and high variety these days. World market is led by technological innovations and changes rapidly. To survive in this environment, the raising of small and medium enterprises is highly desirable. In the context of nationwide restructuring, competitive medium and small industries which are in good financial status should lead the nation's economy. But general ignorance of the safety issues could lead to a miss management of this industry in this field. In this study, actual condition and improvement of safety management are as follows; We have to 1) find out the factors which endangers this industry, and set a proper guideline for safety management. 2) encourage safety management of these industries by themselves, and advertise and provide technical support for using PC and internet. 3) set a higher standard of safety issue when accrediting a prospective medium and small industry, and have a firm control of this issue once accredited. 4) supply more governmental financial aids to terms of safety issues for medium and small industries.

• Journal of Korean Public Health Nursing
• /
• v.8 no.1
• /
• pp.53-62
• /
• 1994

The purpose of this study is to review in light at women's subjective. Perceptions of manifestations Premenstrual Syndrome which are known to affect their labor productivity. To this end, 364 women workers were sampled from an industrial factory located in Chonan, Chungchongnam-do and supervised by health manager, through questionnaires, and collected data were processed using SPSS package program. The result of survey can be summarized as follows: The fact that some academic circles are recently raising the issue of premenstrual syndrome. Suggests that the syndrome is being accepted in academic terms, which is contary to the position that the syndrome is just the result of women's mental imagination. However, some factors which are concived to affect woman worker' productivity and efficiency seem to be related to their subjective psychological variables involving their working environment rather than their physiological variabls. Therefore, if a health-promotion program handling their subjective psychological variables be introduced, some factors caused by the pre-menstrual syndroml may be reduced thus increasing their working productivity and. efficiency around their menstrual days.

• Proceedings of the Korean Institute of Interior Design Conference
• /
• 2007.05a
• /
• pp.237-241
• /
• 2007

Artificial environments and spaces developed in 20th century provided conveniences and comforts and developed spatial thoughts of interior design. But it caused significant environmental estrangement due to environmental disruption and materialism. This caused raising necessity of emotional design in human life spatial design as liberation of human nature is discussed and interest in emotion among human natures is being enhanced. This study manages how emotional design is expressed in basic area of human, residential area. Emotional design is proceeding to the direction designing interface between human and environment considering human physical and psychological characteristics focused on correlation between human and interior space. Therefore through this study, meanings and effects of design considering user emotions are reviewed to materialize expressing factors for combining into actual design.

• Journal of The Korean Digital Architecture Interior Association
• /
• v.9 no.2
• /
• pp.17-24
• /
• 2009

Recently people show interest in cultural exhibition space targeting on children from the birth of children to play and education. Accordingly, lately the necessity of professional special exhibition space, which is composed of changeable program fit to the children trend of a growth period, and shows relatively more freedom and adaptability in directing the theme than permanent exhibition, have increased rapidly. Today the social importance of special exhibition for children is emphasized as an alternative that can provide efficiently the expression of freedom and the environment of experimental space which is not filled in existing academy or school. The necessity of special exhibition space for children is raising to the climax at this moment, this study has the meaning to analyze the direction of domestic special exhibition for children progressed in last 1 year, and then to suggest basic guide and direction for future plan of special exhibitions.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2016.10a
• /
• pp.297-300
• /
• 2016

최근 빅데이터 산업이 발전하고 있는 상황에서 빅데이터 산업에 활용되는 개인정보의 보호에 관한 문제가 대두하고 있다. 빅데이터 산업에서 개인정보를 활용하기 위해서는 비식별화 조치를 해야 한다. 하지만 비식별화는 비식별화 평가 모델 자체의 취약성과 더불어 비식별화된 개인정보를 재식별화 하는 위험성도 존재한다. 본 논문은 적정성 평가 모델, 비식별화 조치 기술, 재식별에 관한 위험성을 연구하고 각 위험성에 대한 대응 방안을 통해 재식별화의 문제를 해결하여 빅데이터 산업에서 비식별화된 개인정보가 안전히 쓰일 수 있도록 해야 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.10a
• /
• pp.85-88
• /
• 2002

Until recently, there have been fundamental changes in many fields of industries. Especially, the mass-production is being changed into mass-customization. In order to construct a 3D e-catalog system far the utilization of mass-customization, there are several matters to consider. Setting realistic 3D image should be effective fur providing the customers with the product information with reality and raising their interest. This study explains the whole process to convert CAD data formed from the production activities into VRML data used in virtual reality environment. Examples are given and discussed to validate the proposed activity.