• Proceedings of the KSR Conference
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• 1999.05a
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• pp.52-59
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• 1999

As the Korea construction market has recent3y opened, the needs to restructure the design standard for the technical advancement in design is increasing. Therefore, we proposed the design standard of railway according to the direction, which is presented in this study that analyze the present situation of the previous design standard. The new design standard of railway was tried to definite a limit in each service stage. This design standard will improve the design quality and induce the accumulation of technology. In addition, it will solve the organic contradiction of construction service. As a result, this research will bring the improvement in the design standard and contribute to the development of Korea construction industry.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.374-378
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• 2008

The analysis about cases which does not correspond in electric equipment technical standard and judgement standard while doing pre inspection, it improves the technical specifications and the draft of construction plan. The analysis of the reform cases prevents the electric disaster and propagates the electrical safety. Hereafter the reform cases will improve the electric technical ability and help the electrical safety of the yard.

• Advances in concrete construction
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• v.8 no.2
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• pp.139-144
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• 2019

In this study, the mechanical properties of reactive powder concrete (RPC) with a constant cement to silica fume ratio of 4 were investigated. In the experimental program, reactive powder concretes with steel fiber at different ratios were produced. Five productions using quartz sand with a maximum grain size of 0.6 mm were performed. A superplasticizer with a ratio of 3% of the cement was used for all productions. $40{\times}40{\times}160mm$ prismatic specimens were prepared and tested for flexural and compression. The specimens were exposed to two different curing conditions as autoclave and standard curing condition. Autoclave exposure was performed for 3 hours under a pressure of 2 MPa. It was observed that the compressive strength of concrete, along with the flexural strength exposed to autoclave was quite high compared to the strength of concretes subjected to standard curing. The results obtained indicated that the compressive strength, along with the flexural strength of autoclaved concrete increased as the amount of cement used increases. Approximately 15% increase in flexural strength was achieved with a 4% steel fiber addition. The maximum compressive strength that has been reached is over 210 MPa for reactive powder concrete for the same steel fiber ratio and with a cement content of $960kg/m^3$. The relationship between compressive strength and flexural strength of reactive powder concrete exposed to both curing conditions was also identified.

• Journal of the Korea Society of Computer and Information
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• v.24 no.8
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• pp.105-111
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• 2019

In this paper, I introduce the development of a system to register Korean standard technical terms which are corresponded with English electronical terminologies on the Electropedia of the International Electronical Committee(IEC). In 2016, this project was started with the permission of registration at the Technical Committee 1 of the $80^{th}$ IEC General Meeting in Frankfurt, Germany. The work was consisted of 3 parts, the 1st step was gathering Korean vocabularies and building a databse for the translation of English terms of International Electronical Vocabulary(IEV) into Korean terms, the 2nd step was to find correct or proper Korean term which is in accord with each English term of IEV on the Electropedia. In this step, members of Korean TC 1 worked for search proper Korean terms using developed computer programs and databases which were made of Korean electronical dictionaries. After selection of proper terms, they did the cross-checking work for Korean terms each other. The last step was to register all of these Korean terms on the Electropedia. As a result, 20,766 Korean electronical terms were registered on the Electropedia in 2017. In the future, it is needed that the definition of English technical terms are translated into Korean.

• Journal of the Korea Organic Resources Recycling Association
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• v.18 no.3
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• pp.38-49
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• 2010

The technology of anaerobic digestion of organic wastes has been researched for the production of biogas in various purposes. Biogas comes from anaerobic digestion and landfill in which that of main components are methane and carbon dioxide containing small amount of hydrogen sulfide and ammonia. Biogas can either be used directly on the site where it is generated after proper upgrading or distributed to external customer via separate pipelines like natural gas. There are four basic ways biogas can be utilized such as production of heat and steam, electricity production, vehicle fuel and production of chemicals. There is no international technical standard for biogas use but some countries have developed national standards and procedures for biogas use. In this paper, technical standards of biogas depending on purpose have reviewed for the several countries.

• Journal of Korean Society of Forest Science
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• v.102 no.3
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• pp.390-397
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• 2013

The study, utilizing a data envelopment analysis (DEA) which is one of the nonparametric estimation methods, aims to evaluate the management efficiency of chestnut tree cultivators in such provinces in Chungchungnam-do as Cheong-yang, Gong-ju, Bu-yeo and so on. The analysis data of this study is based on inputs and outputs of 20 forestry households surveyed in the 2012 survey titled 'A Study on Current Level and Condition of Chestnut Cultivation and Management', which was conducted from March 2012 to October 2012. The elements of inputs are composed of management cost, harvesting cost, material cost, non-operation expenses and cultivation area, while the element of output is a gross margin only. Then the study analyzes a technical efficiency, a puretechnical efficiency and a scale efficiency using CCR and BCC model among DEA methods. Based on that, it also provides improvement methods for forestry households that turned out to be inefficient. In order to verify the result of DEA analysis, the study additionally compares a result of this efficiency study with that of chestnuts management standard diagnostic table. According to the result, the average value of technical efficiency analyzed was 0.667, proving to be inefficient in general. Given that the average value of pure-technical efficiency was 0.944 and that of scale efficiency was 0.703, it can be inferred that inefficiency exists in the field of scale, not in the field of cultivation techniques. As for forestry households with the efficiency score of 1, it is shown that there were 6 households that recorded 1 in the technical efficiency field and 13 households that recorded 1 in the pure technical efficiency. Meanwhile, there were 6 households that recorded 1 in all of the three aspects. In the comparison with the scores from chestnuts management standard diagnostic table, there were 5 households made a high score of over 80, among which are 3 households with score 1 in the technical efficiency. Also, the results of this study and the chestnuts management standard diagnostic table are proved to have the same result, both of them showing the same households that recorded the highest score and the lowest score. This means the management efficiency evaluation using DEA can be applied to the fieldwork along with the chestnuts management standard diagnostic table.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.238.1-238.1
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• 2010

Researches and developments of tidal energy converters are close to commercialization stage. But, commercialization of tidal energy converters is not ready in korea. In Europe, many experts of company, laboratory and public institution involved in marine energy are active for commercialization of marine energy converters in European Marine Energy Centre. Furthermore, in IEC/TC114, standardization of technical standards for assessment and certification of tidal energy converters of each country is under discussion. Therefore, We have to prepare for commercialization, standardization and entry into the overseas market. In this study, trends of commercialization and standardization of international markets of marine energy converters are investigated and certification schemes of overseas are analyzed. We expect that this study will make contribution to establish the foundation of commercialization of tidal energy converters.

• Journal of Korea Technology Innovation Society
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• v.3 no.2
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• pp.111-137
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• 2000

The significant role of the national standards has ever been growing as a critical infrastructure of the national competitiveness. Strategic policies for the advancement of the national standards system in Korea are suggested based on the analysis of trends surrounding the national standards at home and abroad. National standards failing in securing international recognition of its technical competence give an adverse effect to the improvement of industry and national welfare. As a most effective way toward the advancement of the national standards system, the national metrology institute should be placed at the top of the national standards system so as to exert its influence with its technical capabilities close to international level. Efforts are to be made to secure international credibility of the national standards through faithful implementation of the requirements of the mutual recognition arrangement(MRA). And, the legal structures should be refined to be in harmony with the global environment.

• Annual Conference of KIPS
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• 2000.10b
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• pp.1211-1214
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• 2000

의사잡음(PN) 부호는 이상적인 자기상관특성을 갖지 못한다. 본 논문에서는 이상적인 자기상관 특성을 갖지 못하는 PN 부호에 대하여 이상적인 자기상관 특성을 가지도록 하여 동기 직접확산 부호분할 다원접속(DS/CDMA)시스템에서 부가적인 하드웨어 복잡성의 큰 증가 없이 간섭제거가 가능한 수신기 구조를 제안한다. PN 부호 오프셋을 사용하여 사용자 부호를 할당하고, 제안한 수신기 알고리즘을 PN 부호 오프셋을 사용한 시스템에 적용하여 다원접속 간섭 신호가 제거됨을 보이며 컴퓨터 모의실험을 통하여 이를 확인한다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.205-206
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• 2017

This is a study on the propulsion criteria for airworthiness certification of the military aircraft. This treatise described the introduction of the airworthiness certification system, the features and difference between the military and commercial aircraft, the introduction of the standard airworthiness certification, the important technical criteria, and the several application instances of the criteria.