• International Journal of Highway Engineering
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• v.7 no.1 s.23
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• pp.21-29
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• 2005

One way to recycle the construction wastes is to use the waste concrete aggregates as the pavement materials. Although there are many studies and technical developments about waste concrete aggregates, the impurities produced in the process of the aggregate production prevent the use of the waste concrete aggregates in the pavement construction. In this study, the impurities included in the recycled waste aggregates were classified into inorganic and organic ones according to their characteristics, and the influences of each impurities on the pavement performance were presented. It was also showed that the limit of impurity content in the lean concrete base through the correlation between the inorganic impurity content and the compressive strength, and that in the granuler subbase layer through the correlation between the organic impurity content and the modified CBR. In conclusion, it is possible to apply waste concrete aggregates for the pavement when inorganic impurity content is less than 10% in the lean concrete base, and organic impurity content is less than 2% in granular subbase.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.5
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• pp.991-998
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• 2012

This study considered NCW in the general as a key component of Future War and analyzed the international technical trend of tactical data link as the key of technical elements. The technique applied to Future War results from development of electronic communication and IT technique. However, NCW which plays a significant role in the Future War is not possible due to a development of simple technique but requires the amalgamative approach of various techniques essentially. That is, it should be understood and approached the management scenario and various techniques comprehensively. NCW is one of the areas which future electronic communication and IT can concentrate, so the government has been working for the developmental introduction of NCW strategically until 2020. Already, the level of localization of components related to electronics in military supplies exceeds 85%, but under the amalgamative research of technology in the high level like this, it would be possible to create new opportunities. Thus, the electronic communication and IT technology should seek effective applications of NCW by comprehending each area complexly.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.3
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• pp.475-480
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• 2002

As major industries become information -centered, business transactions and information -sharing processes are being computerized and automated, which ultimately re-defines electronic commercial transactions in a broader context. Business documents are the basic tools for corporate transactions. The use of business documents in electronic commercial transactions has increased markedly and this sphere is rapidly being extended to include information sharing between companies. XML(extensible Markup Language) was selected as the focus for this thesis. XML can help to make a complicated and data-rich document easy to share. The thesis proposes a business XML document editing system, comprised of a style document editor for business XM document structure, business documentation, and business document presentation, along with a business document transformation system which makes a transformation possible regardless of platform or using various corporate document standards.

• Journal of Korean Society of Transportation
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• v.26 no.2
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• pp.25-33
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• 2008

This study was practiced in order to analyze the effect of concentrative lighting that is set up at night in some districts. For practicing this study, It was analyzed first, to study the past papers, second, to analyze the condition of the traffic accidents and the characteristics of the accidents, third, to study on the improvements of the high accident locations, finally to study the characteristics about the pedestrians' traffic accidents. The effects of road lighting improvements was analysed. The result of the analysis on concentrative lighting of crosswalk said that the night accidents was decreased to average 16.13% and the Net Present Value(NPV) on the analysis of the effect during using period is 25,648 million won, The B/C is 12.85. So, It was analysed that it is very effective.This study was practiced on the some districts and equipping time is different, and the number of samples is small. Because of this facts, This sample doesn't represent all of the concentrative lightings. But through the systematic analysis, this study can present the alternatives that can be materialized.

• Archives of design research
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• v.20
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• pp.185-196
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• 1997

There were several methods of conception in seeking a visul idea of the advertising design. However, such conventional methods had a tendency that the degrees of utilization and satisfation are lacking. Also, in a thumbnail sketch phase, there was a great tendency to seek an idea based on pictorial elements only and thus depended chiefly on the existing references. Accordingly, originality was not high. Further, under the background which any common methods of a designer and a copywriter, if they have effective. I would like to propose a visul idea conception method, a condensing & amplification method for maintaining a logical system of advertising intelligence and for facilitating creative visualization through a language-oriented approach. The condensing & amplification method is the method of conception, in which after an appeal point as per advertising intelligence is passed through sentence and phrase and then condensed with word, various variation for the word develop, and by selecting the most creative word of the results, the thumbnail sketch commences based on the results amplified with the phrases and sentences.

• 한국방재학회:학술대회논문집
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• 2011.02a
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• pp.166-166
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• 2011

한국건설기술연구원내에 세계 최초로 UHPC(초고성능 콘크리트)를 활용한 보도사장교를 설계 및 시공하여 공용중이다. 초고성능 콘크리트(UHPC, Ultra High Performance Concrete)는 기존의 콘크리트의 단점을 극복하기 위하여 강섬유 및 혼화재료를 사용하여 고강도화와 더불어 인장강도, 휨강도, 균열에 대한 저항성, 전단강도 및 내충격성을 대폭 개선시켜서 구조부재의 연성 및 강도를 확보하기 위해 개발된 것으로서 한국건설기술연구원이 독자적 연구를 바탕으로 UHPC를 개발하였고, KICT-UHPC의 특성을 충분히 반영한 보도사장교를 한국건설기술원내에 실구조물로 시공하였다. 한국건설기술연구원내 본관 1, 2동 연결 보도사장교(SUPER BRIDGE 1)의 진동실험을 통해 UHPC 보도사장교의 동특성(고유진동수 및 모드형상)을 평가하였다. 대상교량에는 보도사장교의 캔틸레버 구조 특성에 의해 발생하는 진동을 제어하기 위한 질량 264kg의 난간형 수직진동제어장치(TMD) 4대가 설치되어 있으며, 부가질량의 운동을 기계적으로 구속하거나 구속을 해제하여 TMD의 작동을 켜거나 끌 수 있도록 되어있다. TMD의 가동 및 정지시 동특성을 비교하는 정밀한 검증 실험을 통하여 TMD 설치에 의한 동특성의 변화도 평가하였다. 가진망치에 의한 충격실험으로부터 획득한 가속도 시간이력 데이터와 가진망치의 가진력 시간이력 데이터를 사용하여 주파수응답함수(FRF, frequency response function)를 계산하고, 이로부터 Super Bridge I의 동적모드형상과 고유진동수를 추출하였다. 1차 모드의 고유진동수는 TMD 정지시 2.2949 Hz, TMD 작동시 2.0996 Hz로서 8%정도 감소하였다. 충격해머에 의한 가진 실험을 통해 세계 최초로 시공한 UHPC 보도사장교의 진동특성과 관련한 신뢰성 있는 자료를 확보할 수 있었다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.559-564
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• 2020

In order to attain the best-educated people in a rapidly changing, modern society with English is an official language, this study applies the problem-based learning (PBL) method to the English Science Class. PBL problems were developed for PBL classes, and their effectiveness has been proven. The focus of this study was five PBL questions posed during the first semester, targeting seven learners in the fourth grade of Elementary School A. The questions were divided into levels aimed at each grade, with the emphasis on specialized English education. Learners wrote journals, peer evaluations, and self-evaluations after finishing their PBL classes. Also, a survey about PBL was conducted after the first semester. The results of the study showed that learners experienced an 86% improvement in presentation skills, an 86% improved interest in learning, 86% better understanding, and 100% improvement in both problem-solving skills and cooperation. On the other hand, learners had difficulty in understanding PBL problems, and with research using the internet. PBL was somewhat unfamiliar to the students, but the survey found that learners are already aware of its effectiveness, and that they are interested in PBL.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.12
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• pp.6071-6080
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• 2012

Regarding the official authentication method which is a strong encrypt method for financial transactions, there has recently been a concern for the problem of storage. As a solution for such problems, this study provides the anonymous authentication method based on the smart card used for such a purpose by utilizing the pseudo ID replacing the user's personal data. Such an anonymous authentication method makes it possible to prevent any inside leakage, intermediary attack, limited re-transmission attack, service-denying attack, directional safety attack and secret inspector attack in regard to the user's personal data. As a result, there would be no concern for the leakage of any personal data. In comparative analysis, after executing the comparison and analysis process through the experiment for the authentication process by using the previously-used smart card, the new one has shown about 10% a high level of efficiency for the encrypt and decrypt process together with excellent features in terms of flexibility in regard to the user's anonymity and tracking ability.

• Microbiology and Biotechnology Letters
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• v.34 no.2
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• pp.115-120
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• 2006

Enzymatic hydrolysis of silk fibers were investigated for the preparation of soluble silk peptides by ten food-grade proteases from Bacillus, Aspergilius, and plant sources. Silk fibers were dissolved for 1 hr in a 2:1 cosolvent (50% $CaCl_2$: ethanol) by heating at $90^{\circ}C$. The silk solution was filtered to remove Impurity particles and desalted for 50 hours by a dialysis process to remove the used cosolvent. When the silk hydrolysis was performed at $45^{\circ}C$ for 2 hours, most proteases from Bacillus and Aspergillus generated large amounts of insoluble aggregates. On the contrary, proteases from plant sources produced much less aggregates during prolonged incubations and also exhibited high hydrolysis activities. In regards of the solubility and broad molecular sizes of produced silk peptides, Bromelain was finally selected and applied for the enzymatic hydrolysis of silk fibers.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.05a
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• pp.423-449
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• 2017

그간 다양한 제조업에서 발생한 후발국가의 '추격'에 대한 연구가 다수 이루어졌다. 특히 최근에는 추격을 위한 기회의 창 관점에서 새로운 후발국가에 의한 추격의 반복과 그에 따른 산업 시장 주도권의 이전을 논의하기 위한 '추격 사이클' 이론이 제시되어 몇몇 산업과 시장에서 발생한 주도권 이전에 관한 실증 연구가 등장하기 시작하였다. 그러나 산업 시장 주도권 이전 현상은 이미 광범위하게 일어나고 있으며, 이에 대한 논의의 심화와 이론의 발전을 위해서는 심층적인 실증 연구가 지속적으로 등장할 필요가 있다. 이에 따라 본 연구에서는 중국 굴삭기 시장에서 발생한 우리나라에서 중국으로의 주도권 이전의 원인과 그 과정을 추격 사이클 이론에서 제시한 세 가지 기회의 창, 즉 기술적 기회의 창, 수요적 기회의 창, 그리고 정책 제도적 기회의 창과 이에 대한 우리나라와 중국 굴삭기 산업의 전략적 대응 간 결합을 통해 고찰하였다. 먼저 기술적 기회의 창 관점에서는 굴삭기 아키텍처의 모듈화가 완제품 생산에 필요한 기술적 지식의 장벽을 낮추고 기술 학습 속도를 높임으로써 중국 굴삭기 산업의 추격과 시장 주도권 확보에 긍정적인 영향을 미친 것으로 나타났다. 한편 중국 정부의 수요산업(건설업) 육성 정책과 핵심 부품의 수입 관세 철폐, 공용 부품 표준화 정책과 같은 정책 제도적 기회의 창과 이에 대한 중국의 적극적 대응 또한 시장 주도권 이전에 긍정적인 영향을 미침을 확인하였다. 마지막으로 수요적 기회의 창의 관점에서는 2010년 이후 미니 소형 세분시장의 급속한 확대에 대한 중국의 전략적 대응이 산업 주도권 이전에 큰 영향을 미침을 발견하였다. 본 연구는 추격 사이클 이론에 대한 새로운 실증을 제시함으로써 향후 본 이론의 발전에 기여할 것으로 기대된다. 또한 본 연구 결과는 중국의 추격에 직면하였거나 이미 주도권을 넘겨준 우리나라의 제조업의 위기 극복 및 지속가능한 성장을 위한 전략과 정책 수립의 중요한 지침으로 널리 활용될 것으로 기대된다.