• Korean Journal of Animal Reproduction
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• v.12 no.2
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• pp.70-76
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• 1988

Effects of the glycerol addition and removal medium containg 10% sucrose on the mouse embryo survival after freezing in a liquid introgen container were determined using the FDA test. The summarized results are the following. 1. The FDA score was higher (P<0.05) when embryos were frozen in the glycerol addition medium with sucrose that the one without it(3.4 vs 3.0). 2. No difference in the score was found between the glycerol removal medium containing 10% sucrose(3.2) and PBS＋10% sucrose(3.3). 3. The score was higher(P<0.01) at morular stage than blastocyst stage of embryos.

• Progress in Superconductivity
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• v.11 no.1
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• pp.19-24
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• 2009

Among the various types of fault current limiters, superconducting fault current limiters could be the most preferable choice for high voltage electric power systems owing to the remarkable current limiting characteristics of superconductors. But, there have been no commercial superconducting fault current limiters which were installed into actual electric power systems until these days due to some remained technical and economical problems. Thus, in order to promote the development and application of the superconducting fault current limiters into real field, it is essential to understand the power utilities’ requirements for their networks and also suitable test method and some specifications should be prepared. This paper focuses on the matters of test requirements and standardization issues that should be prepared for commercialization of superconducting fault current limiters. The unique current limiting characteristics of superconducting fault current limiters were investigated and related other standards including circuit breakers, transformers, reactors, power fuse, and fused circuit breakers were compared to setup the basis of novel specification of superconducting fault current limiters. Furthermore, required essential test procedures for superconducting fault current limiters were suggested.

• Journal of the military operations research society of Korea
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• v.30 no.1
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• pp.81-91
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• 2004

Since HLA (High Level Architecture) was selected as a standardized distributed simulation architecture by US DoD in order to guarantee interoperability among all types of simulations, weapons system and C4I systems, to improve reusability of developed models in mid 1990s, a large number of federates have been developed and certified in accordance with HLA specifications. This paper illustrates case studies on HLA compliance test which are helpful for developers and managers. Based on experiences obtained from international HLA compliance test of CJ21_NG being developed for ground warfare simulation during ROKA's BCTP and UFL exercises, compliance procedures of US Defense and Modelling Simulation Office (DMSO) are introduced, and detail information at each phase of compliance test is provided.

• Journal of the Korea Institute of Military Science and Technology
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• v.4 no.1
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• pp.177-187
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• 2001

It is important to test and evaluate the variation degree of ship-mounted antenna radiated power with respect to all directions in order to use more effectively antennas that installed on naval ships. The naval ship has various sensors for navigation, communication and electronic warfare, etc. And the performance of these sensors extremely depends on the various characteristics of antenna system to transmit and receive electromagnetic wave. The radiated power pattern of the antenna differs from all aspect angles of the ship because of complex superstructures. It is important to know the weak point(direction) of antenna radiation for appropriate operation. Therefore, the ARP(Antenna Radiation Pattern) of shipboard antennas is measured for the all aspect angles. The results of ARP measurement are utilized as reference for antenna arrangement of newly-built same class warship. This study also describes the development results for the ARP measurement technique, software design and test procedures to measure the radiation pattern of communication equipment antennas using the fixed test site.

• Journal of the Korean Data and Information Science Society
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• v.17 no.4
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• pp.1375-1386
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• 2006

In life testing, the lifetimes of test units under the usual conditions are so long that life testing at usual conditions is impractical. Testing units are subjected to conditions of high stress to yield informations quickly. In this paper, the inferences of parameters on the three step-stress accelerated life testing are studied. The two-parameter exponential distribution with a failure rate function that a log-quadratic function of stress and the tempered failure rate model are considered. We obtain the maximum likelihood estimators of the model parameters and their confidence regions. A numerical example will be given to illustrate the proposed inferential procedures.

• Proceedings of the Korea Concrete Institute Conference
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• 2004.05a
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• pp.172-175
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• 2004

This study is to investigate the tensile properties of glass fiber reinforced polymer(GFRP) reinforcing bars with various kinds of anchor systems experimentally. Three types of anchor systems were examined: resin sleeve anchor adopted by CSA Standard, metal overlay anchor by ASTM Standards and wedge anchor normally used in prestressing tendons. Also, three different types of GFRP bars with different surface deformations were tested in this study. All test procedures including specimens preparation, test apparatus and measuring devices were made according to the recommendations of CSA Standard S806-02. From the test results, it was found that the highest tensile strength of GFRP bar was developed by resin sleeve anchor, and tensile strength of GFRP bar with CSA anchor system is $10\%$ higher than that with ASTM anchor system in the case of sand-coated GFRP bar.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.1
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• pp.14-19
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• 2008

In order to verify a substation automation system based on IEC 61850, Korea Electric Power Research Institute under the project related to SAS has constructed IED testing system, which consists of HMI, IED(Intelligent Electronic Device), network equipment, V/I generator, and performed a various of communication tests such as the interoperability test between two IEDs made by other vendors. The test was proceeded based on SCL(Substation Configuration Description Language). This paper presents ways and procedures to simulate those tests and solutions to clear up SCL based engineering problems and compatibility among the individual manufacture tools.

• Communications for Statistical Applications and Methods
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• v.23 no.4
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• pp.269-285
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• 2016

In this paper, a simple step-stress accelerated life test (ALT) under progressive type-II censoring is considered. Progressive type-II censoring and accelerated life testing are provided to decrease the lifetime of testing and lower test expenses. The cumulative exposure model is assumed when the lifetime of test units follows an extension of the exponential distribution. Maximum likelihood estimates (MLEs) and Bayes estimates (BEs) of the model parameters are also obtained. In addition, a real dataset is analyzed to illustrate the proposed procedures. Approximate, bootstrap and credible confidence intervals (CIs) of the estimators are then derived. Finally, the accuracy of the MLEs and BEs for the model parameters is investigated through simulation studies.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 1992.04a
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• pp.95-101
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• 1992

The Pseudodynamic test is a new experimental technique for simulating the earthquake response of structures or structural components in the time domain. It is especially efficient for testing structures that are too large, heavy or strong to be tested on a shaking table. But the obtained responses in the Pseudodynamic test are distorted by the experimental errors inevitably during control and measurement procedures. The studies are to investigate the effects of the experimental errors on the Pseudodynamic responses and apply a correction method to the Pseudodynamic testing algorithm. It is shown that the corrected responses using the Equivalent Energy Compensation Method are in a good correlation with the theoretical ones. Thus, the corrected Pseudodynamic responses could be reliable for evaluating the seismic performance of structural systems.

• Journal of Families and Better Life
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• v.11 no.1
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• pp.218-234
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• 1993

A study focused on the wives'managerial behavior and their life satisfaction according to wives'stress level ad their coping behavior. The statistical procedures used were percentile mean cronbach's a T-test F-test cluster analysis. Duncan's Multiple Range test. For the purpose the sample were conducted using questionnairs on 548 housewives that lived in seoul. The major findings wee ; 1) The wives's education level of background variables significantly was differentiated from wives' managerial behavior and their life satisfaction respectively. 2) The wives'stress level and their coping behavior respectively was higher than average. from wives'managerial behavior respectively. 4) The variable i.e. wives'stress level wives'coping behavior significantly was differentiate from wives'life satisfaction respectively In conclusion to improve wives'managerial behavior and their life satisfaction this study suggests we have to try to release or decrease wives'stress level and to do the resonable wives'co-ping behavior.