• 한국도로학회논문집
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• 제11권4호
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• pp.133-142
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• 2009

본 연구는 지불계수를 이용하여 시험포장 구간의 품질을 평가하고 이에 따른 피로수명의 변화를 분석하기 위해 실시되었다. 특히 품질관리가 어려운 아스팔트 함량을 지불규정 기준인자로 선정하여 지불계수를 산출하였다. 먼저 아스팔트 함량이 피로수명에 미치는 영향을 확인하기 위하여 아스팔트 함량에 따른 피로수명의 연관성을 분석하였다. 이후 총 2회에 걸쳐 시험포장 구간에서 시료를 채취해서 지불계수를 산출하여 시험포장 구간의 품질을 평가하였으며, 지불계수에 따라 시험포장 구간의 품질에 차이가 있음을 확인 할 수 있었다. 시험포장 구간에 포설된 아스팔트 혼합물을 이용하여 시편을 제작, 피로수명을 분석하였다. 그 결과 지불계수가 높은 시험포장의 피로수명이 월등히 높음을 확인할 수 있었다. 이는 통계이론을 이용한 지불계수가 실제 포장의 피로수명을 반영한다는 것을 의미한다고 사료된다. 또한 시험포장 구간에 아스팔트 혼합물을 납품한 플랜트의 배합보고서와 동일한 시편을 제작하여 휨 피로시험을 실시하여 1, 2회차 시험포장의 피로수명들과 비교하였다. 그 결과 배합보고서를 기초로 제작한 시편의 피로수명이 시험포장 구간의 피로수명에 비해 월등히 높음을 알 수 있었다. 이는 입도나 기타 요인에 따른 공용성 감소현상이 발생 할 수 있음을 나타내는 것이라 사료된다. 따라서 지불규정을 적용중인 미국과 같이 입도, 공극률 등을 지불규정 기준인자로 선정하여 최종적인 지불계수를 산출하는 것이 보다 정확한 도로포장의 품질을 평가할 수 있을 것이다.

• 한국해양공학회지
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• 제33권2호
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• pp.178-188
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• 2019

When burying underwater cables using robots, heading control is one of the key functions for the robots to improve task efficiency. This paper addresses the heading control issue for URI-T, an ROV for underwater construction tasks, including the burial and maintenance of cables or small diameter pipelines. Through modeling and identifying the heading motion of URI-T, the dynamic characteristics and input limitation are analyzed. Based on the identification results, a PD type controller with appropriate input treatment is designed for the heading control of URI-T. The performance of the heading controller was verified in water tank experiments. The field applicability of the proposed controller was also evaluated through the sea trial of URI-T at the East Sea, with a water depth of 500 m.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.430-434
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• 2015

Safety education at the tertiary level prepares students to enter construction industry with adequate safety knowledge; then accidents can be prevented proactively. However, safety subject has not been paid adequate attention in universities and most institutional safety programs consider safety matters in isolation. Meanwhile, anatomical theory in the medicine field has been successfully adopted and proved potential advantageous in various scientific disciplines. With this regard, this study proposes a visualization based Building Anatomy Model (BAM) for construction safety education, which utilizes the anatomical theory in order to improve student's safety knowledge and practical skill. This BAM consists of two modules: 1) Knowledge Acquisition Module (KAM) aims to deliver safety knowledge to students through building anatomy models; 2) Practical Experience Module (PEM) where students safely perform construction activities by using the system to improve safety skill. The system trial is validated with virtual scenarios derived from real accidents cases. This study emphasizes the visualization based building anatomy model would be a powerful pedagogical method to provide effectively safety knowledge and practical skill for students, as a result, safety competence of students would be enhanced.

• 통상정보연구
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• 제5권2호
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• pp.91-112
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• 2003

Nowadays, the spreading of electronic commerce using internet demands a lot of change in business environments, as it is called B2B. Especially, the B2B based EC have a majority rates over the 10% of whole EC markets. As the approach way and the core axis of e-Marketplace in B2B markets are changed more by the business section and industry section than by each company sections, all of the world leading company including Korea are trying to take a prior occupation in e-Marketplace market. In korea, B2B e-Marketplace are mainly leaded by ministry of commerce, industry and energy which choice the company, run a trial managed company. Above MOCIE efforts are now having a lot of trial and error. Accordingly, this thesis are focused on researching the construction trends of B2B e-Marketplace, the future prospects, and promotion plans.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.551-556
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• 2002

High-performance concrete is defined as concrete that meets special combinations of performance and uniformity requirements that cannot always be achieved routinely using conventional constituents and normal mixing, placing, and curing practices. Ever since the term high-performance concrete was introduced into the industry, it had widely used in large-scale concrete construction that demands high-strength, high-flowability, and high-durability. To obtain such performances that cannot be obtained from conventional concrete and by the current method, a large number of trial mixes are required to select the desired combination of materials that meets special performance. In this paper, therefore, using genetic algorithm which is a global optimization technique modeled on biological evolutionary process-natural selection and natural genetics-and can be used to find a near optimal solution to a problem that may have many solutions, the new design method for high-performance concrete mixtures is suggested to reduce the number of trial mixtures with desired properties in the field test. Experimental and analytic investigations were carried out to develop the design method for high-performance concrete mixtures and to verify the proposed mix design.

• 대한조선학회논문집
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• 제34권3호
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• pp.85-95
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• 1997

그동안 축적된 기술을 활용하여 차세대 "300인승 초고속 수중익 쌍동여객선"의 설계에 대한 연구를 수행하였으며 연구 수행이 극히 성공적으로 완료되어 모형시험을 통하여 확인된 성능은 설계목표를 훨씬 능가하고 있다. 본 연구를 통하여 설계 완료된 "초고속 수중익 쌍동여객선"의 건조 및 시운전은 이미 완료되었으며 가까운 장래에 시운전 결과를 발표하고자 한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 춘계학술대회논문집
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• pp.738-741
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• 2003

In general, the essential requirement for cruisers or car ferries is the reduction in noise to ensure high quality and comfort. Recently, the Ro-Ro Passengers Ferry (ROPAX) was built in Hyundai Heavy Industries. In order to minimize the noise levels, careful attention have to De paid by the special committee of experts from the initial design stage to the sea trial. Proper countermeasures, considering the characteristics of sources and receiver spaces, were applied from the noise prediction and various experiment results. Finally, this ship was successfully delivered with excellent noise properties. This paper describes the procedure of noise analysis, the countermeasures of noise control, and the measurement results of the sea trial. Onboard noise analysis had been carried out by statistical energy analysis program and outdoor noise prediction program based on ISO9614. The prediction results are in good agreements with the measurement results. The technology to minimize the noise levels for cruisers or car ferries has been established throughout the construction of this ship.

• 한국컴퓨터정보학회논문지
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• 제7권1호
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• pp.62-67
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• 2002

동북아 중심 항만의 기반을 다지기 위해 자동화터미널의 건설이 시급히 요청되고 있다. 따라서 우리나라에 적합한 자동화터미널의 운영시스템 설계방안을 제시하고자 한다. 본 논문에서는 자동화터미널의 운영시스템이 추구해야할 목표를 충족시키며 각 자동화 장비를 통한 화물의 수출입 이동경로에 따라 운영시스템의 기본 모델을 4가지로 구분하고, 여러 입력 요소들을 변경시켜 가며 Trial and Error 방법을 통하여 동적으로 분석해 나감으로서 최적의 운영시스템 모델을 설계하였다 본 논문의 운영시스템에서 기술한 장비들은 Quay Crane을 제외한 모든 야드 장비가 완전자동화를 전제로 한 것이다.

• 한국건축시공학회지
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• 제3권1호
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• pp.139-146
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• 2003

The special requirements of high-performance concrete(HPC) could be enhanced property over others such as compressive strength, durability, and construction practices. In order to satisfy these requirements a series of laboratory trial mixes and following mock-up test of reinforced concrete wall at field were performed in this study. The objective of this study was to quantitatively evaluate the workability, compressive strength, and the increased heat of hydration caused by the increase of the specific weight of cement according to various variables. Six example series designed about a minimum compressive strength of 500kgf/$\textrm{cm}^2$ at 28 days, and an approximately slump and slump flow of 25cm and 60cm respectively were tested. The selection process of the specific weight of water and the percentage of fly-ash transposition determined to be most suitable for the production of HPC is presented in the following paper.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 봄 학술발표회 논문집
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• pp.113-120
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• 1999

Deep excavation,1 in the urban areas may cause terrible damages to the adjacent structures. Most damages are due to the settlement of ground during excavation work. This article introduces two actual examples of structure damage in subway construction projects. A through of attempts to find out the factors that are affecting to the settlement of ground was made through site investigations and analyses of measurement data. Some suggestions are given to prevent the repeat of trial and error in deep excavation projects. This kind of attempts are eccentrical to the development and improvement of information-oriented construction method.