• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.5
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• pp.1915-1933
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• 2013

In this study, the virtual fixed point analysis and 3D fully modeling analysis for bent pile structures are conducted by considering various influencing factors and the applicability of the virtual fixed point theory is discussed. Also, the optimized column-pile length ratio is analyzed for supplementing virtual fixed point design and examining a more exact behavior of bent pile structures by taking into account the major influencing parameters such as pile length, column and pile diameter, reinforcement ratio and soil conditions. To obtain the detailed information, the settlement and lateral deflection of the virtual fixed point theory are smaller than those of 3D fully modeling analysis. On the other hand, the virtual fixed point analysis overestimates the axial force and bending moment compared with 3D fully modeling analysis. It is shown that the virtual fixed point analysis cannot adequately predict the real behavior of bent pile structures. Therefore, it is necessary that 3D fully modeling analysis is considered for the exact design of bent pile structures. In this study, the emphasis is on quantifying an improved design method (optimized column-pile length ratio) of bent pile structures developed by considering the relation between the column-pile length ratio and allowable lateral deflection criteria. It can be effectively used to perform a more economical and improved design of bent pile structures.

• Journal of the Society of Disaster Information
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• v.19 no.4
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• pp.916-923
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• 2023

Purpose: Looking at the status of fatal accidents in the construction industry in the 2022 Industrial Accident Status Supplementary Statistics, 27.8% of all fatal accidents in the construction industry are caused by construction equipment. In order to overcome the limitations of tours and inspections caused by the enlargement of sites and high-rise buildings, we plan to build a model that can extract construction equipment using computer vision technology and analyze the model's accuracy and field applicability. Method: In this study, deep learning is used to learn image data from excavators, dump trucks, and mobile cranes among construction equipment, and then the learning results are evaluated and analyzed and applied to construction sites. Result: At site 'A', objects of excavators and dump trucks were extracted, and the average extraction accuracy was 81.42% for excavators and 78.23% for dump trucks. The mobile crane at site 'B' showed an average accuracy of 78.14%. Conclusion: It is believed that the efficiency of on-site safety management can be increased and the risk factors for disaster occurrence can be minimized. In addition, based on this study, it can be used as basic data on the introduction of smart construction technology at construction sites.

• The Journal of Korean Institute for Practical Engineering Education
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• v.1 no.1
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• pp.79-84
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• 2009

It is necessary to use industrial oriented equipment, as well as lecturer who has field experience, textbook and materials for engineering education which meets the change of industrial technology. Current education equipment is composed of general purposed equipment which are used for teaching with ease and convenience instead of field oriented achieving technology. The leads to failure of engineering education to keep up with the change of industrial technology, making engineering education stay far away from field oriented education. This study looks at the case of development of education equipment which takes an important role in engineering education, and suggests the ways of development and utilization of engineering education equipment by analyzing the effects of education when the equipment are used in the education.

• The Journal of Korean Institute for Practical Engineering Education
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• v.4 no.1
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• pp.99-107
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• 2012

The purpose of this study was to develop a Industrial Professional Practice(IPP) at university education as a way of innovation strategy in order to effectively respond industrial needs in dynamic environment. A Industrial Professional Practice model was developed by using a structured on the job training model and had a 7 steps which were "planning Industrial Professional Practice, selecting enterprises and students, matching enterprises and students, job analysis, design and development program, implementation, evaluation and feedback. Based on the Industrial Professional Practice model, the directions for the future studies was discussed.

• Journal of Korean Society of Disaster and Security
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• v.6 no.1
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• pp.47-53
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• 2013

Standard Incident Command System in Korea is that Incident Command System for Emergency Rescue Operation, which is commanded only by Fire Fighting Agencies. However, in the event of a disaster such as the flood, storm, or landslide disaster, there are many disaster response activities performed by the General Public Officers at the disaster on-scene. Yet, there isn't an Natural Disaster Command System for the General Public Officers in Korea. Thus, we have studied the response activities needed cooperation among agencies and proposed some considerations of the Natural Disaster Command System for General Public Officers. The system will be useful to response and recover disaster rapidly, seamlessly, and cooperatively among General Public Officers and the related agencies.

• Tunnel and Underground Space
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• v.21 no.3
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• pp.181-191
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• 2011

It is very difficult to prepare a lab. test specimen from weak rock masses affected by faults, highly fractured zone or weathered zone. In conventional method of in situ direct shear test a rock block is sheared inside galleries, where reactions for the hydraulic jacks are available. A new in situ direct shear test apparatus has been developed in this study to perform the test inside galleries as well as open pit conditions. The apparatus is composed of normal and shear reaction plates including load transfer plates, hydraulic cylinder systems, load cells, multistage shear boxes with fixing devices, and needle rollers. Maximum size of the test block is $400{\times}400{\times}460$ mm, and procedures of the test block preparation has been suggested. To explore the field applicability of in situ direct shear test apparatus, proper test block site was investigated by extensive geological field survey. In situ direct shear test has been successful in producing most of information related to strength and deformability of the weak rock.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.2
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• pp.927-935
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• 2011

In-situ California Bearing Ratio(CBR) test has been widely used for evaluating the subgrade condition in pavements. However, because the in-situ CBR test is expensive and takes time for operation, it is difficult to figure out the in-situ characteristics of subgrade strength in detail. For faster and economical operation, the Dynamic Cone Penetrometer(DCP) has been often utilized for estimating the subgrade strength in the field. The purpose of this paper is to determine the relationship between CBR value and DCP index of the embankment constructed with mixtures of soil and waste lime. Waste lime used in this study is producted as a by-product in the manufacturing process of making $Na_2CO_3$ from local chemical factory in Incheon. In this field measurement, the geotechnical tests such as field water content, field density, field CBR test, and dynamic cone penetration test were conducted.

• The Magazine for Energy Service Companies
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• s.72
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• pp.32-39
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• 2011

ESCO협회는 정보통신산업진흥원이 발주한 'IT기반 에너지절약사업 동향조사 및 타당성 분석에 관한 연구용역'을 에코시안과 공동으로 수행 중이다. 오는 11월까지 연구를 마무리 할 예정으로, 연구과제가 완료되면 그린 IT와 에너지절약사업을 접목해 ESCO사업이 가능한 아이템을 발굴한다는 목표로 최선을 다하고 있다. 시범사업장 현장방문 사례를 통해 그린 IT와 에너지절약사업이 같이 상생할 수 있는 가능성을 알아보았다.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2001.03a
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• pp.132-138
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• 2001

홍콩 HMRT(Hongkong Mass Railway Tunnel) 지하철 공사현장에서는 터널굴착시 나타난 고경사절리로 인해 상당한 여굴이 발생하였다. 이에 대한 원인을 규명하기 위하여 각 터널별로 발생한 여굴의 양과 위치 등을 조사하고 이를 입찰설계단계에서 이루어진 시추공조사와 굴착단계에서의 막장검측에 의한 지질조건과 서로 비교, 분석하였다. 터널굴착에서 발생하는 여굴은 막장의 고경사 절리의 분포와 방향에 의해 영향을 받았으며, 암반조건 RQD, Q'와도 밀접한 관계를 가지는 것으로 나타났다. 본 현장의 분석에 따르면 터널설계시 고경사절리의 존재여부 및 분포, 방향성 등을 면밀히 조사하고 해석하여 사전에 여굴의 발생 가능성을 확인하는 것이 필요하다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.10a
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• pp.673-676
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• 2000

변압기에서 발생되는 부분방전은 변압기의 운전중 절연열화에 대한 정보를 가장 잘 나타내고있으나, 현장에서 부분방전을 측정하는데 주변 환경적인 문제인 노이즈로 인해 측정의 어려움과 측정된 데이터의 정확한 판단에 어려움이 따른다. 이에 본 연구에서는 노이즈를 완전히 해결하지 못하는 기존방식을 벗어나 높은 영역에서 주위의 노이즈를 덜 받는 HFPD 측정법을 적용하여 광양제철 산소공장에서 데이터를 취득하여 부분방전을 분석하였다. 본 논문에서는 HFPD의 변압기적용과 강인한 현장환경에 따른 영향을 최소화하여 제안한 방법이 변압기의 부분방전 시험에 유용하게 사용할 수 있음을 보였다.