• 방사성폐기물학회지
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• 제14권2호
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• pp.135-147
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• 2016

심지층 처분시스템에서 완충재는 지하수 유입으로부터 처분용기를 보호하고, 방사성 핵종 유출을 저지하기 위한 중요한 방벽의 하나이다. 이에 완충재는 장기 건전성, 낮은 수리전도도, 낮은 유기물의 함량, 높은 핵종저지능, 높은 팽윤성, 높은 열전도도 등 기술적 요건을 충족시켜야 하며 이는 정량적 분석결과를 바탕으로 결정될 수 있다. 국내의 경우 한국원자력연구원에서는 1997년부터 경주지역에서 생산되는 벤토나이트를 완충재 후보물질로 연구를 지속하고 있다. 본 논문에서는 최근 동일 지역에서 생산된 벤토나이트(KJ-II)의 7가지 물리적 및 화학적 특성을 평가하였다. 분석 결과, 국내산 벤토나이트의 몬모릴로나이트 함량은 약 65% 정도이며, 벤토나이트는 Ca형 벤토나이트이다. 본 논문을 통해 완충재 후보물질의 성능평가 항목과 분석 방법에 대한 기준을 제시하고자 하였다.

• 한국환경교육학회지:환경교육
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• 제17권2호
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• pp.60-78
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• 2004

A survey performed on property of water usage, a recognition and stand on water, and awareness of practice related to water saving among primary and secondary teachers in Daegu metropolitan city leads to the following result. First, regarding the actual condition of water usage, boiled tap water was most preferred, followed by purified tap water, mineral water, and water from a mineral spring respectively. Second, the result of a survey regarding a recognition and stand on water presents that the quality of purified water and mineral water is generally trusted, not including tap water. A majority of teachers barely had any ideas on the process of tap water supplies and sewage disposal system. Third, another survey was performed to determine whether there's a gender difference on a general recognition of and stand on water usage, actual practice of water saving and love for water. As a result, 7 out of 25 questions showed the difference of significance by p<.05. As for tap water service and sewage disposal system, there were differences on 5 out of 6 questions, indicating that male teachers are more knowledgable than their female counterparts. Fourth, the result of the research about the recognition and attitudes about water and water saving of the teachers who were categorized by the age group showed that 14 questions of the 25 questions had differences in p<.05 level. Teachers in their twenties and thirties had less interest than those in their forties and fifties.

• 기록학연구
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• 제4호
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• pp.63-91
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• 2001

This study is intended to examine the existing condition of records and archives management and seek its improvement and progress on a concrete model of Daejon Diocese as a kind of case study, because it is necessary to recognize the importance of records and archives management and to develop the records and archives management system. Daejon Diocese which has the catholic jurisdiction covering the areas of Daejon city and Chung Cheong Nam - Do province, celebrated the 40th anniversary of the diocese in 1998. At that, time, the authority of Daejon Diocese claimed to establish its church history institution and to plan the publication of "40 years history of Daejon Diocese". However, its publication could not be achieved until now for several reasons. Since my search for the cause of this situation, I immediately recognized that the lack of materials might be a common condition in almost all of the associations, especially with respect to management, preservation and access of the records and archives. The records in the archival repository of Daejon Diocese have been considerably lost because of the past intemperate destruction and these records have just piled for long time without any reasonable disposal programme. Therefore, in these poor conditions, it is inevitable to delay the publication of "40 years history of Daejon Diocese." This thesis deals with the archival arrangement and the ways of improvement by means of studying the records and archives management, as the essential issues. The archival arrangement based on the principle of provenance, the date of creation, and form division. The methods of improvement include the preservation environment, the scope of archives, archival staff, disposal and so on. Records have the legal and social value after being produced and they can remain as historical and cultural inheritances under the excellent condition of management and preservation. However, in examining the case of the management and preservation of records and archives in Daejon Diocese, I understand that it will need considerable time, man power, and financial cost in order to maintain the desirable level of records and archives management system Therefore, it is a important step for Catholic Daejon to recognize the necessity of the change over records and archives management.

• 한국건설순환자원학회논문집
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• 제11권3호
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• pp.251-259
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• 2023

이 연구에서는 건설폐기물의 효율적인 재활용과 친환경 적정 처리를 위한 분별해체 제도의 활성화를 위한 기초연구로써, 우선적으로 분별해체 적용을 통한 경제적인 효용성을 분석하고자 하였다. 이를 위하여 5층 높이의 공동주택 1동의 공사면적 2,400 m² 를 대상으로 분별해체 공사를 실시할 경우, ① 해체공사 시공비용의 증가액, 혼합폐기물의 감소로 인한 ② 발생 폐기물 처리 비용 절감액, 분리·선별한 폐기물을 활용한 ③ 재활용으로부터 얻을 수 있는 수익을 종합적으로 검토하였을 때, 일반 해체공사와 비교하여 총 34,727천원의 비용 절감 효과가 예상됨을 확인할 수 있었다.

• Coupled systems mechanics
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• 제12권6호
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• pp.531-537
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• 2023

Municipal solid waste landfills are unpredictable bioreactors which in cases of mishandling and bad supervision presents numerous risks. The key to municipal waste landfills is to approach them from the point of prevention of the possible consequences, which means using methods of organized waste disposal, and also utilizing landfill gas, as an unavoidable consequence with disposal of municipal solid waste with a high share of biodegradable organic matter. This paper presents an overview about problems of solid municipal waste management, type and composition of waste, and an overview of waste management condition. Further, the problem of landfill and landfill gasses is described with the calculation models of landfill production, as well as the use of the SWM GHG Calculator and LandGEM software on a specific example of gas production for the central zone at Sarajevo landfill "Smiljevici". Main focus of this thesis is the analysis of potentials of greenhouse gas emission reduction measures from the waste management. Overview of the best available techniques in waste management is presented as well as the methodology used for calculations. Scenarios of greenhouse gas emission reduction in waste management were defined so that emissions were calculated using the appropriate model. In the final section of the paper, its description of the problem of collection and utilization the landfill gas at the sanitary landfill "Smiljevici", and implementation of the system for landfill gas collection and solution suggestion for the gasification and exploitation of gas. Energy, environmental and economic benefits can be accomplished by utilizing municipal solid waste as fuel in industry and energy and moreover by utilizing energy generation from landfill gas, which this thesis emphasizes.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1523-1529
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• 2011

Light Rail Transit is system that offer target Performance and function because various sub-system such as vehicles, power supply, signaling, communication, mechanical, track, civil is consisted as large complex system. Light Rail Transit and the complex system of safety, reliability to be a behavior, and target performance and function properly to system's configuration, design, manufacture, installation and test verification, through operations system requirements to accurately describe what It is more important. With this study, light rail system KSX ISO/IEC 15288 system life cycle process by applying engineering techniques utilizing light rail system in the early stages of construction from the concept, design, production, operation, maintenance and end-use to the disposal stage throughout the entire life cycle, from the beginning of construction until the end of construction of the stakeholder to define requirements, analyze the introduction of the system developers and system requirement of those who wish to be described accurately by selecting the best system and system requirement in order to achieve their purpose.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.7-13
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• 2011

RAMS is the procedure to maximize the reliability and availability of systems with managing operation rate, the frequency of failure in the system and repair method. Recently, all system life-cycle focusing on RAMS process has been rapidly developing in the field of railway vehicles, for example, applying th reliability management techniques for procurement and disposal of EMU. In particular, global economic recession require to reasonable measures for the EMU maintenance costs under the circumstances therefore, an alternative solution based on RCM(Reliability Centered Maintenance) which is the optimal maintenance method is interested. In this study, the state of being critical of each component and a primary factors was analyzed to improve VVVF inverter of the line 7 EMU by applying FMECA process. Furthermore, this paper showed the impact of connecting between the main and sub system. Based on these data, critical components according to malfunction ratings were classified by screening measures and improvements for each components was summarized.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2004년도 학술논문집
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• pp.194-198
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• 2004

The thermo-hydro-mechanical (T-H-M) process is one of major issues in the performance assessment of a high level waste (HLW) repository. An engineering-scale test was planned and its experimental set-up has being installed, to validate the T-H-M behavior in the buffer of a reference disposal system. The experimental set-up consists of 4 major components: the confining cylinder with its hydration water tank, the bentonite block, the heating system, and the sensors and instruments. The monitoring and data acquisition system is employed to control the heater to maintain the temperature of $95^{\circ}C$ at the interface of the heater and bentonite blocks and to collect signals from sensors and instruments installed in the bentonite blocks.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1113-1118
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• 2004

This paper presents the dynamic analysis method for an electromechanical system. The engineer has at his disposal a variety of software simulation tools. However, difficulties arise when the study of the behavior of complex electromechanical systems in combination with coupling element is required. Typical examples of such systems are machines for factory automation, home automation, and office automation. Dynamic systems analysis packages or electronic systems analysis packages offer the restrictive to simulate these mixed systems such electromechanical product. Electronic circuit analysis algorithm is easily incorporated into a multi-body dynamics analysis algorithm. The governing equation of electronic circuit is formulated as a differential algebraic equation form including both electrical and mechanical variables and is simultaneously solved in every time step. This analysis method clearly demonstrates the application potential for mixed electromechanical simulation.

• 해양환경안전학회지
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• 제6권1호
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• pp.57-67
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• 2000

All crude oil carries a little of water, sand, and mineral sediment molecules tightly bounded with hydrocarbons. The result is the gradual precipitation of these heavier elements into thick, granular petroleum by products known as crude oil sludge. The oily sludges in ship tanks and in storage facilities have to be treated efficiently in order to keep the security and the capacity of storage facilities, to protect a serious environmental pollution, and to retrieve lost resource. The oily sludge treatment system should be designed to satisfy requirements mentioned in safe work condition. As a basic study, in this paper, an oily sludge treatment system by ultrasonic waves was proposed. Then, the features of ultrasonic energy and recovery of sludge with ultrasonic waves are investigated by experiments. As results, we found that ultrasonic waves are a new energy to flow oil sludge environment-friendly in safe work condition. In addition, it was shown that ultrasonic energy is more efficient than thermal energy in treating oil sludge, and that the volume of wastes for disposal is reduced remarkably.