• Applied Microscopy
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• v.25 no.2
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• pp.80-87
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• 1995

An analytical electron microscope system has been widely used in biology, medicine, veterinary medicine, agriculture, and materials, etc. nowadays in Korea Market since mid of 1980's. How to install and to choose the equipments? The answers are which prerequisites are needed to us. The purpose is going to introduce the prerequisites of the pre-installation and installation of Philips analytical electron microscope(CM 12/STEM and SEM 515, Philips, The Netherlands) in the National Institute of Safety Research, Seoul and to discuss the check-subjects. The check-subjects in the pre-installation and installation are more than 24. The influence of magnetic fields, mechanical vibrations, earth is crucial factor for decision of installation site. The areas of our electron microscope center are $105.6m^2$ and have the Automatic Image Analyzer System(IBAS, Kontron Co., Germany) connecting to the SEM mode. Water temperature was controlled by the NESLAB recirculatory chillers(NESLAB Co., U.S.A.).

• International Journal of Highway Engineering
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• v.15 no.4
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• pp.135-146
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• 2013

PURPOSES : This study aimed to analyze the impact the operation of pre-signals at 4-leg signalized intersections and present primary environmental factors of roads that need to be considered in the installation of pre-signals. METHODS : Shift of proportions safety effectiveness evaluation method which assesses shifts in proportions of target collision types to determine safety effectiveness was applied to analyze traffic crash by types. Also, Empirical Bayes before/after safety effectiveness evaluation method was adapted to analyze the impact pre-signal installation. Negative binomial regression was conducted to determine SPF(safety performance function). RESULTS : Pre-signals are effective in reducing the number of head on, right angle and sideswipe collisions and both the total number of personal injury crashes and severe crashes. Also, it is deemed that each factor used as an independent variable for the SPF model has strong correlation with the total number of personal injury crashes and severe crashes, and impacts general traffic crashes as a whole. CONCLUSIONS: This study suggests the following should be considered in pre-signal installation on intersections. 1) U-turns allowed in the front and rear 2) A high number of roads that connect to the intersection 3) Many right-turn traffic flows 4) Crosswalks installed in the front and rear 5) Insufficient left-turn lanes compared to left-turn traffic flows or no left-turn-only lane.

• Journal of the Korea Institute of Building Construction
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• v.11 no.5
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• pp.482-500
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• 2011

In apartment housing construction, window frame installation work, which is conducted after the structural framework, is very important, because its completion time directly affects the starting time of successive interior finishing works, as well as the overall construction period. Construction delays in interior finishing works might occur due to problems inherent to the conventional window frame installation method, such as the poor verticality of window frames, and the water leakage around them. The primary objective of this study is to analyze the problems of a 'Gangform integrated PVC window frame pre-installation method' based on its pilot test results. Next, this study proposes an improved conceptual model that enables the end users to enhance the field applicability of this method in terms of productivity, time, and cost. The field applicability of the proposed 'Gangform integrated PVC window frame pre-installation method' was also verified through a survey.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.6
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• pp.9-13
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• 2001

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.6
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• pp.9-15
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• 2003

• 한국전자현미경학회:학술대회논문집
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• 1994.05a
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• pp.8-8
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• 1994

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.11
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• pp.30-35
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• 2008

An analog type turbine control system in a nuclear power plant in Korea was replaced by a digital type control system successfully. The turbine simulator was used to verify and validate the perfection of newly developed digital control system prior to its actual installation. In this paper, the newly developed turbine speed control system, ie. governor will be introduced together with how to simulate entire control loop. After that, we will compare the comparison of simulation result in laboratory with pre startup simulation result. Eventually the performance of actual operation result was testified.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.05a
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• pp.57-60
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• 2005

This paper describes the experimental results of the pre-breakdown phenomena in $SF_6/CO_2$ mixtures under non-uniform electric fields caused by positive and negative lightning negative voltages. $SF_6/CO_2$ mixtures have an advantage of an environmental aspect and cost reduction, and safety aspects. In order to analyze the pre-breakdown processes in $SF_6/CO_2$ mixtures stressed by impulse voltages, pre-breakdown current and luminous signals were measured by a shunt and a photo-multiplier tube, respectively. Dielectric strengthes of $SF_6/CO_2$ mixtures were investigated. Additionally, characteristics of discharge channels were observed by high speed cameras and the physical properties were discussed. The pre-breakdown propagates with a stepwise process. The in to breakdown from the corona onset point in positive polarity was shorter than that in negative polarity. The time intervals of positive leaders are shorter than those of negative leaders, and the path of positive leader channel is zigzag.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.11a
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• pp.239-241
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• 2007

In this paper we describe streamer propagations characterizing underwater pre-breakdown and breakdown behaviour under impulse voltages. Streamer corona branches in lower resistivities are much thicker and brighter than those in higher resistivities. The negative streamer channels not only have more branches but also widely spread out than the positive streamer channels. The succession of streamer coronas during re-breakdown produces a stepwise propagation. The pre-breakdown currents consist of the conduction current and streamer corona current pulses.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.05a
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• pp.163-166
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• 2005

Colors are in the inseparable relation ia the all parts of human life. The color influences not only our psychological and physiological aspects, but also our way of behavior. The purpose of this study was to investigate the color preference and the personal color of 100 university students. As results of researching current university students color preference when we compare it with pre-studied results, it shows some differences. In pre-studied, the blue and black marked high degree, but for recent students, it has appeared that warm color is highly preferred. Also warm color has shown as the personal color. There were significant differences in the relation between the blood type and color preference. It appears that the blood type A and B were preferred to cold color while the blood type of B and AB were preferred to warm color.