• Journal of the Korean Recycled Construction Resources Institute
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• v.1 no.1
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• pp.49-57
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• 2013

Recently, recycling of industrial by-products and CO2 reduction have been important issues in the world. In this reason, applications and reuse of Fly ash as a binder for concrete, which is generated in thermoelectric power plant, have been one of the effective recycle methods. In order for Fly ash to be applied to concrete, Korean Standard(KS) has selected and managed quality such as $SiO_2$, fineness, specific gravity, ignition loss and activity index. However, there is a limits for activity index, whose test period required is at least 28 days or 91 days. Activity index is the critical indication standard to determine mechanical strength of concrete that contained Fly ash. To complement the disadvantage of test method, this research provided "API test method", which quickly measure Pozzolanic reaction of Fly ash can be considered as a alternative of activity index. Then, the adaptable API test method need to be investigated through comparative analysis with the test result of API, activity index and K-value. The test method can make evaluation of Fly ash quality faster and more accurate. As a result, most Fly ash produced in Korea has not been satisfied in the KS quality standard except water content and specific gravity, and especially fluidized bed boiler ash has its characteristics. Also, API, activity index and K-value have superior interrelationship. The interrelationship between API and activity index and K-value gets increased as the material age gets higher, so API test can be considered as very useful test method for Pozzolanic reaction evaluation of Fly ash.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.451-459
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• 2021

The purpose of this study is to evaluate the performance of a solidifying agent for recycling the fine powder separated from the nuclear power plant decommissioned concrete as a solidifying agent(SA) for radioactive waste. In order to evaluate the performance of the solidifying agent, a powder simulating the fine powder of waste concrete separated from the dismantled concrete of a nuclear power plant was produced, and the main variables were the type of binder and the replacement ratio of zeolite. The solidifying agent was evaluated for fluidity performance, compressive strength, and leaching resistance to non-radioactive cesium. The compressive strength of SA increased as the zeolite replacement ratio increased, and the SA containing 5% or more of zeolite showed a compressive strength that was 1.4 to 1.7 times higher than the acceptance criteria. The cesium leaching index of all specimens was 6 or higher, satisfying the acceptance criteria, and the leaching index of SA was 1.47~1.63 times higher than that of OPC. In particular, the average leaching index after 28 days of the 5% zeolite-substituted solidifying agent was 9.15, which was improved by about 6.4% compared to OPC, and it was confirmed that the zeolite was effective in improving the leaching resistance to cesium ions by showing stable performance over the entire period.

• Korean Journal of Construction Engineering and Management
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• v.8 no.4
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• pp.128-136
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• 2007

As the international-level concern has been focused on the environmental sustainability in recent years, many researches emphasized the needs for methods and techniques that would facilitate sustainability assessment at the various project level interfaces. As part of methods and techniques to facilitate sustainability assessment, this paper provides 'Computerized Waste Management Performance Evaluation Tool' for the purpose of assessing the level of management system in dealing with the onsite construction wastes. This tool applies twenty-three waste management performance factors for the purpose of evaluating the level of waste management performance by scoring those factors which were identified in the previous research. These twenty-three factors are classified into four categories: manpower, material, method, and management based on their characteristics. In order to quantitatively evaluate the effectiveness of waste management performance, the levels of actions executed in a site by each waste management performance factor were identified and their weight were analyzed throughout the expert interview and survey. Furthermore, an excel-based computerized tool was developed in order to facilitate the evaluation process. If this tool can be developed in more detail and be used as the method to control waste management at a project level for the future, it is expected that this tool can play an important role in the body of knowledge of environmental management in construction industry.

• Journal of the Korean Society for information Management
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• v.36 no.4
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• pp.129-159
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• 2019

The Purpose of this study is to develop an evaluation model for usability of research data service from the angles of evaluating usefulness of research data service itself and research data use experience-based usability. First, the various cases of evaluating usability of data services are examined and 4 rating scales and 20 measuring indicators for research data service are derived as a result of comparative analysis. In order to verify validity and reliability of the rating scale and the measuring indicators, the study conducted a survey of 164 potential research data users. KMO Bartlett Analysis was performed for validity test, and Principle Component Analysis and Verimax Rotating Method were used for component analysis on measuring indicators. The result shows that the 4 intrinsic rating scales satisfy the validity criteria of KMO Barlett; A single component was determined from component analysis, which verifies the validity of measuring indicators of the current rating scale. However, the result of 12 user experience-based measuring indicators analysis identified 2 components that are each classified as rating scale of utilization level and that of participation level. Cronbach's alpha of all 6 rating scales was 0.6 or more for the overall scale.

• Journal of the Korea Organic Resources Recycling Association
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• v.10 no.3
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• pp.85-91
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• 2002

To investigate the agricultural material application possibility of the compost made by the fermenting tank. We evaluate the stability fertility of the compost In evaluation of the stability of the compost, In germination index of test, germination test of lettuce of little resistibility not germinated wholly, in the radish of resistibility, both Shinco and TM-101 is showed 61%, 55% of germination rate, length of root not showed wholly. In stability fertility of the compost, early growth of radish in a little treatment applied was superior to other treatments except for TM-101 treatment, but the latter growth of those was showed opposite result. In evaluation of the fertility of compost, Primary growth of lettuce was superior in treatment applied 1.5t/10a, the latter growth of those was superior in treatment applied 3t/10a.

• Korean Journal of Materials Research
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• v.6 no.3
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• pp.245-252
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• 1996

본 연구는 화강암 폐재의 재활용을 목적으로 한 기초적인 연구로서, 분말형태의 화강암폐재를 Ca(OH2)와 혼합하여 수열 hot press 법에 의해 고화시켰다. 아울러 고화체의 기계적 성질을 평가하였으며, 미시적 조직구조의 변화 및 파괴거동을 파악하기 위해 음향방출실험을 실시하였다. 고화체의 기계적 성질은 수열온도의 의존성이 있었으며, 28$0^{\circ}C$에서 최대강도를 보였다. 또한 고화체의 파면은 수열온도에 따라 현저히 다른 양상을 보였으며, 수열실험동안 다양한 화합물이 생성되었다. 그 중에서 cyclowollastonite, tobermorite 및 rankinite 등은 강도를 향상시키는 주된 화합물이었고, crossite 및 xonotlite 등은 강도의 저하를 초래하였다. 한편, 기공이 많이 존재할수록 AE counts는 더많이 발생하였으며, 최대하중에서 AE counts는 최대치를 보였고, 강도가 증가함에 따라 AE신호는 보다 많이 방출되었다.

• Journal of the Korean Geotechnical Society
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• v.19 no.5
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• pp.243-252
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• 2003

Environmental Double Pile method was presented as a device to improve low permeable contaminated soil. EDP is one of the latest technology in a concept of one step process that is applied to low permeable contaminated ground to reutilize the site by enhancing drainage, contaminated remediation, bearing capacity of piles. In order to evaluate on-site applicability of this technology, qualities of EDP's drainage, strength and remediation were assessed through a series of experiments; EDP was verified to achieve remediation and improvement of soft ground.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.210-215
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• 2008

SCORM(Sharable Content Object Reference Model)은 세계 이러닝(e-Learning) 표준화 분야에서 가장 주목을 받고 있는 ADL(Advanced Distributed Learning)의 표준화 모델이다. ADL은 비교적 안정화 단계에 접어들었다는 평가를 받고 있는 SCORM 2004를 제시함으로써 콘텐츠의 재활용성을 높여 경제성 있는 콘텐츠 구현을 가능하게 하였고, 개발 과정에서의 효율성을 극대화 시켰다. 그러나 SCORM 스펙의 다양한 요소를 충분히 활용하면서도 게임적인 요소를 가미하여 효과적인 학습 콘텐츠를 구현 할 수 있는가에 대한 연구는 현재 매우 미약한 실정이다. 또한 IMS SS(Simple Sequencing)를 기반으로 하는 SCORM 시퀀싱 & 네비게이션은 구현 방법이 간단하지 않아 LSAL등에서 제공하는 SCORM 시퀀싱 템플릿을 거의 그대로 사용하는 것이 일반적이다. 따라서 본 연구에서는 LSAL 템플릿 모델 및 게임 기반 학습에 대한 관련 연구 조사를 수행하고, 게임 기반 학습에서 사용 될 수 있는 SCORM 데이터 모델을 참고하여 이를 실제 초등 학습에서 적용 가능한 SCORM 기반 에듀테인먼트 콘텐츠를 제작한다. 또한 기존의 선형적인 학습 구조에서 벗어나 수준별 학습을 실현하는 보다 구체적이고 세련된 시퀀싱 & 네비게이션 설계 방법을 제시한다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.226-232
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• 2002

포장이란 유통단계에서 제품이 파손되거나 손상되지 않도록 보호하는 수단이며 원가절감과 생산성 향상을 통한 상품성의 제고는 물론 부가가치 증대 및 매출신장에도 큰 영향을 미친다. 더욱이 포장재료의 재활용, 환경친화성 신소재 개발 등에 따른 포장의 중요성에 대한 인식의 전환이 요구된다. 최근 환경보호 문제가 전 세계적으로 확대되면서 포장폐기물 처리의 중요성이 새로이 인식되어, 포장완충재의 주종을 이루던 플라스틱계 재료의 사용이 환경오염과 관련하여 엄격히 규제됨에 따라 환경친화력이 우수한 지류완충재의 사용이 증가하고 있으며, 농산물의 직거래가 활발해지고 생산자 실명제를 도입한 결과 농산물 포장용 골판지 상자의 기능이 운반용에서 판매용으로 전환되고 있으며 화려한 디자인과 필요이상의 강도로 설계, 유통되고 있어 과대포장이 심각한 수준에 달하고 있다. 유통과정 중 제품을 적절히 보호하고 적정 포장비로 물류합리화를 위해서는 제품의 완충 및 적정포장설계가 필요하며, 이를 위한 첫 번째 조건이 완충재 자체에 대한 특성의 평가와 이의 객관적 자료화이다. (중략)

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.146-150
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• 2007

SPOT 위성으로부터 수신한 많은 영상을 효율적으로 관리 및 활용하기 위해서는 데이터베이스 개발과 이를 이용한 검색 시스템의 구축이 필요하다. 검색 시스템과 서버 간에는 서비스 규약이 필요한데 상호 이질적인 위성 영상 자료를 웹 기반 분산 환경에서 지원하기 위해서는 표준 인터페이스와 각각의 웹 서비스 모델을 정의한 통합 시스템이 요구된다. 따라서 다양한 지리정보 검색 시스템과 상호 운용성을 갖기 위해서는 표준사양을 준수하여 개발하는 것이 효율적이다. 본 논문에서는 OGC의 GIS 관련 표준사양인 WMS(Web Map Service) 규약을 이용하여 SPOT 위성 영상 데이터 고유 포맷의 데이터는 별도로 유지하되, 정보 공유를 위해 시스템 독립적인 포맷으로 변환하여 위성 영상을 제공하는 방안을 제시한다. 이를 일반 웹 브라우저와 3차원 가시화 프로그램을 이용하여 평가해 보았고, 지형기반 정보시스템에 적용 가능함을 확인하였다. 본 논문에서 제시한 연구를 통하여 재활용 빈도가 높고 공공성을 갖는 위성 영상을 표준 인터페이스를 통하여 공유함으로써 위성 영상의 활용성을 높일 수 있으리라 판단된다.