• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.05a
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• pp.59-62
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• 2019

인천신항 내 기존 준설토 투기장은 2018년에 수토가 완료 될 예정이므로 향후 항만개발과 운영시 발생되는 준설토의 원활한 처리를 위해서는 신규 준설토 투기장 조성이 필요하다. 투기장 조성을 위해서는 중 장기적인 준설토 처리방안 등을 고려한 항만기능 향상과 경쟁력 강화를 위한 준설토 투기장 호안 축조가 선행되어야 하기 때문에 극동건설 컨소시움에서는 퍼펙트델타라는 설계컨셉을 수립하고 내구성과 안전성을 강화한 설계, 조기수토 공간확보 및 수토용량 증대, 자연과 인간 도시가 함께하는 환경 친화적인 설계, 현장여건에 가장 적합한 설계를 구현하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.493-493
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• 2023

매설배관의 피복손상부 탐측법은 CIPS법, DCVG법 등 여러 방법이 있으며, 그중 우리나라에서는 DCVG법이 가장 많이 사용되고 있다. 피복손상탐측기술(DCVG)은 매설된 관로에 대하여 직류 전류로 인해 배관주변에 발생하는 전위구배를 측정하여 비굴착상태에서 관로의 피복손상부를 찾아내는 기술이다. 본 기술을 광역상수도 정밀안전진단 및 성능평가에 적용하였으며, 탐측된 위치에 대하여 위험도(%IR)를 예측하였다. 또한 손상의심부에 대한 굴착을 통해 피복손상부를 확인하였다. 본 기술의 신뢰성 및 상수도 분야에 큰 활용성을 확인하였다. 관경, 현장여건 등에 따른 조사 및 굴착에 일부 한계점을 보였으나, 향후 축적된 데이터를 바탕으로 매설된 관로의 손상을 사전에 확인하여 관로사고를 미연에 방지할 기술로 판단된다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.06a
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• pp.157-158
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• 2020

In order to calculate construction costs properly, it is necessary to add the weight that reflects different worksite conditions. The implementation of the weight, however, is difficult because it is impossible to determine whether wight should be added in basic work or whether weight values are overlapped. Special worksite conditions further complicate the matter. Furthermore, overlapping implementation of weight values result in overestimation of construction costs. The current study clearly analyzed the weight value items in the current construction cost calculation standards, and analyzed the weight value items included under the basic productivity category to propose an improvement of weight standards. Basically, the estimating standards provide 140 weight value items, with different levels of weight given to each item. Among 1,333 items in the estimating standards, 140 include weight values. Some items have two types of weight values.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.977-980
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• 2008

Recently, the study on the application of SCC(Self-Compacting Concrete) is actively underway, in order to solve the lack of flowability and the poor compacting which is one of the chronic problems of tunnel lining concrete. The aim of this study is that to verify the validity of the application of SCLC(Self-Compacting Lining Concrete) for tunnel lining concrete and to examine the characteristic of flowing and mechanics of SCLC in term of comparing before and after casting SCLC was developed by Packing Factor mix method and casted in field mix-design according to the condition of site and the characteristic of aggregate. Before casting, the tests of the capability of flowability and durability was performed by slump flow, air void and so on. Additionally, the slump flow loss is measured to evaluated the possibility of cast-in-place. Furthermore, considering on the first time SCLC casting applied to the tunnel lining in Korea, it is provided that the careful items and the correct way for construction when applied the SCLC on site.

• Fire Science and Engineering
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• v.33 no.6
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• pp.173-180
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• 2019

Oil tank fires need to be suppressed differently from other oil-related fires, due to the high-temperature flames and hot updraft above the tank, in the former case, that cause the destruction of large amounts of foam. We studied high-capacity foam discharge systems based on the standards of the American Petroleum Institute (API), National Fire Protection Association (NFPA), British Standard European Norm (BS EN), and the laws of Japan. The performance of a high-capacity foam discharge system was measured by conducting real fire experiments with model oil tanks. We concluded that lightweight and easily movable high-capacity foam discharge systems should be urgently introduced in domestic operations. Additionally, the obstacles faced by major tanks, such as long-distance installation of large-diameter fire hoses and narrowing of firefighting spaces, should be resolved depending on the conditions of the site.

• Tunnel and Underground Space
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• v.25 no.5
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• pp.408-416
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• 2015

The collapse of the underground cavities and voids, which were made for developing mineral resources, can cause the subsidence of the ground surface in the residential areas. During the Japanese colonial era and the 1960's mining boom period, lots of mines had been developed indiscriminately in Korea. Due to complicated geological conditions and mining methods, many of dangerous underground mine cavities with steep slopes had been generated at the shallow surface. Due to such conditions, it is difficult to directly apply valid foreign reclamation practice for the cavities in Korea environments. It is necessary to develop the efficient ground stabilization technologies for the Korea underground mine conditions to solve abandoned mine reclamation properly. Therefore, MIRECO and Korea government have been carrying out practical researches and technical developments together with other academic researchers and reclamation business partners, and various practical solutions such as surveying and exploration methods, proper cavity filling materials and reinforcement methods have been developed with application in the mine field. In this article, up to date technologies and R&D trends in the field of mine subsidence prevention technology are broadly reviewed to establish the future direction of a research and development.

• Journal of the Korea Society of Computer and Information
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• v.17 no.5
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• pp.147-155
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• 2012

Police education has shown a pronounced improvement during three eras in American police history. as the Reform Era arrived, the police academy was invented. With it, citizen expectations for the police expanded, and the level of competence exhibited by police grew. After the 1960s came the invention of the FTO and the creation of ongoing, in-service training requirements. in recent years, academics in many places-but by no means everywhere-are taking a more collegial approach to training, aimed especially at COP- style policing and the achievement of genuine professionalism. The Korean police training system is less efficient in education methodology, more inappropriate in the switch system of school education and practice, and poorer in educational environment, among others. Based on my findings, this paper recommends several improvement tips. First, legal stipulations on police training should be integrated and detailed. Second, active participation by preliminary police officers should be emphasized in the class of police training. Third, contents and hours for practice should be emphasized to maximize effects of the "switch system." Fourth, the educational environment of the Academy should be improved.

• Korean Journal of Childcare and Education
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• v.9 no.4
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• pp.235-257
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• 2013

This study intended to deeply understand teachers' experiences about their self-supervision at after-school nurseries through many different stories. This study composed field texts based on the data collected through face-to-face talks with participants, their journals, and e-mails and phone conversations given and taken with participants for a total of 4 months from September to the end of December, 2012. The teachers all had ten years teaching experience, and worked as after-school nursery teachers in S-gu, S-si. The study found many things such as experiencing the joy of learning things that were unknown through self-supervision, hardship involved in self-supervision, co-workers dedicated to joint learning, and time and spaced used to better understand children. The study figured out that the meaning of self-supervision lay in the pursuit of learning and bright eyes(seeing what was not seen before), despite the difficult condition to self-supervise, the after-school nursery teachers unceasing passion for self-supervision brings happiness within oneself. As a result, this study discussed the implications which the experience of after-school nursery teachers who found a happy meaning of life through self-supervision in spite of the actual difficult conditions offered to after-school nursery teachers.

• Journal of Convergence for Information Technology
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• v.10 no.2
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• pp.1-8
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• 2020

The standardized procurement of supervisory cost for the construction of domestic Information and Communication Technology(ICT) facilities, which is announced by the Korea Engineering and Construction Association in May 2009, has been applied in the public institutions and private industries. However, the previous standardized procurement is not widely applied in recent years because the ICT and social economic environment have been rapidly changed and the previous equations to calculate the supervisory cost is not simplified. As results, the needs for a new standardized procurement has been increased and the Ministry of Industry, Commerce and Energy has published a notice with new standard procurement. In this paper, we provide the explanation of the background and the derivation process of the notice based on authors' experiences of project participation. As research method, we compare the previous mad-day cost of ICT construction and that of another area including electric facility construction, and then we explain a new procurement equation based on WBS(Work Breakdown Structure).

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.743-746
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• 2007

Now, in a domestic country, the rebuilding and redevelopment of existing houses has been rapidly increasing with an economic growth and the improvement of living condition. The percentage of C&D waste among generating waste in domestic is more and more increasing. Accordingly, Our government or company are doing much effort to decrease the C&D waste. But now, we can not find any results about system development for estimating and managing rightly the C&D waste quantity. Now, much social cost are increasing for reason of the institutional inertia for forecasting quantity of C&D waste. Therefore, This study suggest some methods be able to estimate it of apartment easily. The methods are composed with utilization of a basic unit, a CAD drawing and a 3D object. Each module can be also used individually according to the purpose of a user.