• Journal of the Korean housing association
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• v.21 no.4
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• pp.129-137
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• 2010

This study surveys the degree of residents' satisfaction on the current street space to suggest alternatives for the improvement of the street space design in detached house areas. In the results of the survey, we find the following. First, in the result of analysis on age, residential term, having children or not, income level, and type of house ownership, residents are homogeneous in social and economic characteristics. There are similarity in geographical, locational conditions, neighboring facilities, deterioration of residential house, and the time of residential formation among residential areas. Second, satisfactory determinants of residents on street space according to street types, are maintenance, protection of privacy, and parking space. Third, satisfactory determinants of residents on street hierarchy is the inner circulation road while unsatisfactory one is the inner roads. Fourth, age, residential term and type of house ownership are significant factors influencing residents' satisfaction. Factors influencing satisfaction on street space are also affecting total satisfaction and factors associated with street environment are perceived more important ones than factors associated with street activities. Thus we find the degrees of satisfaction for residents on street type and street hierarchy are different despite that general characteristics of residents are similar. We also find residents consider street noise and maintenance as critical factor among physical factors of street space.

• Journal of Korean Home Economics Education Association
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• v.6 no.2
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• pp.59-71
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• 1994

The purpose of this study was to analyze the problems of housing education in Home Economics and then to present some suggestion for improving the housing education in the middle school and to analyze the problems of housing edcation that was investigated on the recognition and application in real life of housing area subject to male/female students in the middle school. The respondents were 600 boys and girls of middle school. Statistical methods adopted for data analysis were Frequency, Chi-square, t-test, F-test. The major findings were follows: 1. Many students(67.2%) responded that housing of home economics was wholly helpful in the actual life. 2. Many students recognized the necessity for the housing education. They particularly recognized the need about the knowlidge of sanitation and facilities of housing. 3. The degree to which housing education applied in the real life was lower than that to which it was needed. 4. There was a tendency that the more students realized the usefulness of housing education, the more positively they applied it in the real life. 5. The contents that students preferred to be additionally included in housing education were improvement of residential environment, solutions to housing environmental deterioration and pollution, future housing, and housing for the elderly.

• KIEAE Journal
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• v.10 no.6
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• pp.139-144
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• 2010

The demands are increasing for the efficient heating and cooling system and thermal comfort environment because of changes in climate and environment, and deterioration of buildings and facilities can cause education budget to increase. So the study to apply heating and cooling system to university is urgently needed to improve an optimum energy saving system, educational environment and convenience of maintenance. For this reason, we selected a university campus in Seoul then came to understand the current situation and found some problems. We drew alternatives from comparative analysis of them. It selects representative building and carries out economic analysis to evaluate characteristics of energy consumption and economics on each type of heating and cooling system. As a result we drew the optimum system from those processes as previously stated. We studied 3 available systems, absorption chiller, EHP(Electric Heat Pump) and GHP(Gas Engine Heat Pump). According to LCC analysis suppose that the value of EHP is 1, it came out that the value of absorption chiller is 1.5 and the value of GHP is 2.2. This study, suggesting the optimum heating and cooling system, will support educational and research activities furthermore effect to maximize energy efficiency. Ultimately it is expected that it will contribute to make eco-friendly Green Campus.

• Korean Journal of Construction Engineering and Management
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• v.8 no.3
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• pp.159-167
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• 2007

In this study, the concepts of integrated VE analysis assessment is introduced in order to achieve "Design for Deterioration performance" in design VE phase. For this purpose, a framework for fuzzy reliability based LCC and value analysis model using fuzzy logic based approach for breakwaters Projects is suggested. It is anticipated that the methodology Proposed in this paper can also be utilized in the design and maintenance phase of other facilities where decision making is made for the fuzzy reliability based life cycle cost and value analysis.

• The Research Journal of the Costume Culture
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• v.11 no.6
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• pp.826-834
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• 2003

This research is to reveal an aspect of costume culture and a phase of the cloths in the relationship of the Chosun dynasty, by considering the exported goods from the Chosun dynasty of the trading goods derived by the trade diplomacy between the two countries in the Chosun dynasty-Japan relationship in the 15th and 16th. The research findings, by analyzing various literatures and related documents, follow. The research results are as follow. The exchange was the form of presenting a return present in return for a tribute to the Chosun dynasty from the Japanese envoy, which has a polycentric characteristic. Pusanpo, Naipo, and Yumpo were designated as the open ports, which played a pivotal role in the Korea-Japan exchange. The imported goods were somok, peppers, drug-stuffs, gold, bronze, sulfur, etc. The exported goods were books and cloths, such as hemp cloths, cotton cloths, silk, etc. The majority of exported goods was cloths, particularly cotton cloths. Meanwhile, in the 15th and the 16th century, with expanding of active trade towards Japan, the amount of export increased rapidly. As a result of the increase of exporting cotton cloths, the raw cottons production was increased and cotton cloth manufacturing was developed. However, it also expanded a dual structure of cotton cloths between the cotton cloths for exports and the cotton cloths for domestic markets. This dual structure of cotton cloth was lead to the deterioration of cotton cloths and had an effect on the price increases of domestic markets.

• Journal of the Semiconductor & Display Technology
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• v.18 no.4
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• pp.87-91
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• 2019

The diagnosis of the failure for the existing electrical facilities was based on regular preventive maintenance, but this preventive maintenance was limited in preventing a lot of cost loss and sudden system failure. To overcome these shortcomings, fault prediction and diagnostic techniques are critical to increasing system reliability by monitoring electrical installations in real time and detecting abnormal conditions in the facility early. As the performance and quality deterioration problem occurs frequently due to the increase in the number of users of the motor pump, the purpose is to build an intelligent control system that can control the motor pump to maximize the performance and to improve the quality and reliability. To this end, a vibration sensor, temperature sensor, pressure sensor, and low water level sensor are used to detect vibrations, temperatures, pressures, and low water levels that can occur in the motor pump, and to build a system that can identify and diagnose information to users in real time.

• Journal of Korean Society for Quality Management
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• v.47 no.1
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• pp.87-96
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• 2019

Purpose: The purpose of this paper is to determine an optimal production time for economic production quantity model with preventive maintenance and random defective rate as the function of a machinery deteriorates. Methods: If a machinery shifts from "in-control" state to "out-of-control" state, a proportion of defective items being produced increases. It is assumed that time to state shift is a random variable and follows an arbitrary distribution. The elapsed time until process shift decreases stochastically as a production cycle repeats and quasi-renewal process is used to implement for production facilities to deteriorate. Results: When the exponential parameter for exponential distribution increases, the optimal production time increases. When Weibull distribution is considered, the optimal production time is closely affected by the shape parameter of Weibull distribution. Conclusion: A mathematical model is suggested to find optimal production time and optimal number of production cycles and numerical examples are implemented to validate the patterns for changes of optimal times under different parameters assumptions. The real application is implemented using the proposed approach.

• Journal of Korean Society on Water Environment
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• v.27 no.5
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• pp.654-660
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• 2011

One of the best way to control Combined Sewer Overflow (CSO) is proposed to construct first flush storage tank. But there is little known parameters for optimum design of these facilities. This study was conducted to get optimum design parameters for a first flush storage tank construction. The optimization of the tank is generally based upon some measure of SS(Suspended Solid) mass holding efficiency. Water quality deterioration of receiving water body happened right after first time occurring rainfall in dry weather seasons. So, design rainfall intensity is used at 2 mm/hr for peak of monthly average intensities of dry seasons. The capacities for each evaluated catchment are designed from 14.4 min to 16.1 min HRT of CSOs flow at design rainfall intensity. Owing to all storage tanks are connected to interception sewer having a redundancy, the suggested volume could be cut down.

• Explosives and Blasting
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• v.39 no.1
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• pp.22-35
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• 2021

The number of a industrial plant that must be demolished due to functional and structural deterioration has been increased. There is an increasing application of explosive demolition or explosive demolition combined with mechanical demolition to minimize temporal and spatial environmental hazardous factors created during the process of demolition. In this case study, to demolish the industrial plant foundation, which is a reinforced concrete structure, the explosive demolition technique was conducted. As a result of the explosive demolition, the overall crushing of plant foundation structure was satisfactory, and the explosive demolition was completed without causing any damage to surrounding facilities.

• Tunnel and Underground Space
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• v.31 no.3
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• pp.198-209
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• 2021

Recently, the demand for demolition of unnecessary steel shell structure is increasing due to deterioration and unsatisfactory functional conditions and the issue of demolition is becoming a major highlight. This execution case was intended to describe an application of the felling method, a explosive demolition method to demolish steel shell structures, for the demolition of a steel stack and steel head tank. As a result of the explosive demolition, the steel stack and steel head tank had collapsed precisely according to the estimated direction. And the explosive demolition was completed without causing any damage to surrounding facilities.