• Proceedings of the Korea Concrete Institute Conference
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• 2000.04a
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• pp.688-693
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• 2000

Recently great efforts and investment have been made in order to evaluate concrete durability by steel corrosion. But most of study is relatively or qualitatively estimated, therefore it has a great limitation in evaluating a remaining service life of concrete. In this research, steel corrosion rate was measured quantitatively by polarization resistance method and multi-regressed considering chloride, carbonation, coverage depth, relative humidity, W/C, and the use of deicing salts. And a half cell potential method was used at th same time for the purpose of comparing with polarization resistance method.

• Communications for Statistical Applications and Methods
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• v.8 no.1
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• pp.281-289
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• 2001

The continuous growth in the use of the World Wide Web is creating the data with very large scale and different types. Analyzing such data can help to determine the life time value of users, evaluate the effectiveness of web sites, and design marketing strategies and services. In this paper, we propose some analysis methods for web data and present an example of a prototypical web data analysis.

• Journal of Chest Surgery
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• v.25 no.2
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• pp.188-193
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• 1992

Life-threatening cardiac arrhythmia is a frequent complication of open heart surgery. There are many causes of postoperative cardiac arrhythmias. Electrolyte imbalance such as hypokalemia and acidemia are major causes of ventricular arrhythmias. Infrequently, however, antiarrhythmic agents and /or hypomagnesemia induce[s] a ventricular arrhythmia such as "torsade de pointes" by increasing the repolarization time of myocardium, Recently, we have experienced two cases of "Torsade de pointes" associated with hyp-omagnesemia after replacement of mitral valve and one of whom after use of procainamide. Intravenous infusion of magnesium immediately and successfully abolished the torsade de pointes in both cases.intes in both cases.

• Journal of the Korean Regional Science Association
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• v.12 no.2
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• pp.69-78
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• 1996

This paper intends to raise some of urban policy issues of managing and planning Seoul for the twenty first century. As one of the world's most dynamic megacities, Seoul is faced with at least two trends: one is globalization of the economy, and the other is humanization of urban development in relation to people's quality of life. Given this context, there are emerging issues in a time of transition as the following; pedestrianization, decline of city master plan, micro land use control, citizen involvement, metro-wide management, infrastructure provisions and maintenance, sustainable development, urban information sustaniable development, urban information system, and public-private partnership.

• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1408-1410
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• 1997

Arrhenius plots are useful in predicting long-term use temperatures of organic materials and in choosing parameters for accelerated aging. The effects of antioxidant on the heat resistance and temperature index of EPDM rubber used for electrical insulation were investigated. The short-time points were obtained by 50% retention of elongation at break.

• Journal of Applied Reliability
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• v.5 no.4
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• pp.413-425
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• 2005

As an alternative to traditional life testing, degradation tests can be effective in assessing product reliability when measurements of degradation leading to failure can be observed. This article presents an accelerated degradation testing for vacuum fluorescent displays (VFDs). The accelerated degradation model is based on Arrhenius-lifetime relationship for cathode temperatures. We compare the results between accelerated degradation test and test at normal use condition. Accelerated degradation test for display devices is observed as an efficient method to warrantee product reliability to customers, as well as a tool to save time and costs.

• Proceedings of the KSR Conference
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• 2002.10a
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• pp.642-647
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• 2002

Y-form steel sleeper are currently enjoying a renaissance in Germany. Their use on ballast track proves that-especially under extreme conditions and loads-they reliably help ensure high stability and a long service life of the track. In addition to conventional partly mechanised tracklaying methods, a new Method has been developed that for the first time enables Y-form sleepers to be laid on an assembly-line basis at a fast rate and with high quality.

• The Journal of Information Technology
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• v.1 no.1
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• pp.27-48
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• 1998

There has been a spurt of the Electronic Commerce using Internet in recent years as the communication technology developed and the computer was widespread througout the world as a dispensible implement of our life. The Electronic Commerce may be further developed as a new trade method if we take into account its advantage that it is hardly influenced by the constraints of time and space.

• Proceedings of the Safety Management and Science Conference
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• 2008.11a
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• pp.153-160
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• 2008

This paper presents the log likelihood function for integrated models for ALT such as exponential-general Eyring, Weibull-temperature and specific heat, lognormal-temperature and specific heat. Additionally this paper estimates the system reliability and mean time to failure(MTTF) for series, parallel, k of n, and standby system using ALT linkage parameter. Lastly this study designs three variable reliability acceptance sampling(RAS) plans such as type I, II censored test, sequential test by the use of integrated models for ALT.

• The Journal of Korean society of community based occupational therapy
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• v.1 no.2
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• pp.11-20
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• 2011

Objective : The purpose of this study was to investigate the effects of the activities of daily living on time-use of the Elderly in facility. This study is also to provide basic data of the redesign time management and lifestyle as occupational therapy. Methods : The subjects were 20 elderly people (over 65 years) who live in S institution of Daejeun from August 11th, to August 22th in 2008. We used time table, interview and FIM which was to evaluate the ability to collect the general characteristics of these subjects(gender, age, moving period, education). Results : There was no significant different between the general characteristics of the subjects and activity of daily living. The more they spent time in Active BADL and IADL, the more they got higher scores in ADL performance ability(p<0.01). The more they spent time in the more they got higher score in ADL performance ability(p<0.05). Conclusion : We could know the amount of spending time of the elderly in Daejeun area facility and it related to activity of daily living. To improve the efficiency of time-use of the elderly, it is needed the role of occupational therapists. They should prepare a intervention to maintain active and positive life of the elderly.