• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2002.05a
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• pp.225-230
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• 2002

현재 미 해군에서 개발 중인 DD21은, 미 해군의 해상 전투력 구조의 핵심인 이지스급 함정을 제외한 DD-963급 구축함과 FFG-7급 프리깃 함의 교체함으로서, 연안전에 대한 새로운 특수 임무에 적응할 수 있게 많은 학자들에 의해 연구되고 있는 차세대 구축함이다. 즉, DD21은 기존 이지스 함정에 부가하여 대지전(Land Attack)과 대기뢰전을 포함한 다목적의 기능을 발휘하면서 전투원의 스마트(Smart), 배치와 장비와 기구의 자동화와 기계화를 통한 함정과 함체의 스텔스(Stealth)화로 유지비와 초기 투자비를 최소화시킨 함정이다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.41 no.4
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• pp.111-122
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• 2018

The private sector is currently reviewing the feasibility of the project or deciding economic policies by analyzing the economic ripple effects. However, the arms acquisition project focuses on the need for the national defense weapons system by analyzing the costs and the effectiveness of the analysis and reviewing the necessity and feasibility of the project. In order to analyze the economic ripple effects, KB (the Bank of Korea) prepares and publishes an analysis table of industrial associations in a given unit. IAAR (the industrial association analysis report) is difficult to apply directly to the defense weapons system. Therefore, research on the economic ripple effects applicable to the defense arms procurement project was needed. In this study, we propose the generic methodology for estimating economical and technical ripple effects resulted in acquiring new weapon systems. Based on the analysis of inter-industrial relations, economical ripple effects are estimated with production inducing effects, value-induced effects, employment-induced effects and export-induced effects. Also, the technological ripple effects are estimated with technological intensity represented by investment cost in research and development. To show the validity of proposed methodology, a case study of acquiring new weapon systems such as GR (guided rocket), destroyer, and helicopter is accomplished. From the case study, it is concluded that these economical & technological ripple effects can be used as a reference to decision making in the course of acquiring major future defense weapons systems.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.7
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• pp.863-869
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• 2018

Due to recent changes in the maritime traffic environment, naval warship accidents are constantly occurring. Especially in 2017, serious loss of life was caused by a US navy destroyer accident. The purpose of this study is to analyze the characteristics of naval warship accident cases and construct an accident scenario by using naval training materials, adjudication of naval warship accidents and US navy destroyer accident reports. Based on the surveyed data, the status of accidents was identified and cases were analyzed. We reproduced 17 accident cases in accordance with accident reproduction procedure and constructed naval warship accident scenarios. As a result of analyzing the CPA, TCPA and PARK model for risk, reproducing 17 naval ship accident cases, collision risk increased on average 5-6 minutes before an accident. The result of this study represents basic data for naval and simulation education materials, contributing to the prevention of marine accidents.

• Proceedings of the Korea Concrete Institute Conference
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• 2001.11a
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• pp.925-928
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• 2001

Recently great efforts and investment have been made in order to achieve economical production by applying new methods like minimization of man-Power into construction field. This paper describe the performance of water purification, to which living organisms can adapt, and the physical properties of porous concrete with continuous voids. Although conventional concrete has been regarded as a destroyer of nature, water and air can pass freely through concrete when it is made porous by forming continuous voids. this not only enables plants to vegetables, but also makes it possible for microscopic animals and plants, including bacteria, to attach to and inhabit uneven surface as well as internal voids when the concrete is provided in a natural water area or waterside area. As a result, Porous concrete using recycled aggregate improved the performance of water purification.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05b
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• pp.649-652
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• 2006

This paper describe the performance of seawater purification, to which living organisms can adapt, and the physical properties of porous concrete with continuous void. Although conventional concrete has been regarded as a destroyer of nature, seawater and air can pass freely through concrete when it is made porous by forming continuous void. This not only enables plants to vegetables, but also makes it possible for microscopic animals and plants, including bacteria, to attach to and inhabit uneven surface as well as internal voids when the concrete is provided in a natural seawater area or seawater side area. As a result, porous concrete using recycled aggregate improved the performance of seawater purification. In this study, The performance of seawater purification of porous concrete using recycled aggregate analyzed by T-P, T-N.

• Proceedings of the KSR Conference
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• 2003.05a
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• pp.239-250
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• 2003

It explained the cause and a process of Taegu subway fire accident in this report. Will reach and to lead it analyzed the structure and actual proof problem which it follows in Urban construction and the operation of Korea. The Urban is operated efficiently to be respected, it demands a security division order to become fixed the culture which it uses, it intercepts the misfortune due to the human being the setup for with the destroyer it is possible. This report will become the place help which reappraises all systems against the construction and the operation of the Urban system.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.11a
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• pp.813-816
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• 2006

Recently, improvements in the standard of living in industrial area require the establishment of a convenient residential environment in order to enhance the quality of living. To achieve such an environment, it is necessary to effectively reduce or prevent various environmental problems occurring in and around residential areas. Although conventional concrete has been regarded as a destroyer of nature, water and air can pass freely through concrete when it is made porous concrete by forming continuous void. In view of the harmony between nature and concrete, various research paths are being taken focusing on coarse aggregates to make porous concrete having continuous voids so as to improve water and air permeability, acoustic absorption, water purification, and applicability to vegetation. In this study, the Physical and Mechanical Properties of porous concrete according to compaction method analyzed by void ratio, coefficient of permeability and compressive strength.

• Journal of the Korea Institute of Military Science and Technology
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• v.15 no.4
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• pp.390-397
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• 2012

According to sailing condition, an exciting force for luminairie of naval vessels was measured and analyzed. A naval combat service support boat and P${\bigcirc}{\bigcirc}$(patrol killer guided missile) were selected as a target naval vessel. Due to their small size and fast speed, they received excessive vibration than other bigger naval vessels like destroyer. The vibration of luminairie was measured on their cruising and maximum speed. This could analyze exciting force for luminairie of naval vessels. Using this analyzed data, the validity of military standard for naval vessel was verified.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.405-408
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• 2020

국방분야에서 전력 운영유지를 위한 군수분야 운영 효율화는 매우 중요한 이슈이다. 군수분야의 효율성을 위해 적정한 수리부속 확보는 장비의 가동률과 예산 절감 차원에서 중요성이 크다. 이에 군은 다양한 기법을 활용하여 수리부속 수요예측에 대한 노력을 계속해 왔으나, 여전히 예측 정확도 향상을 위한 지속적인 노력이 요구된다. 이에 본 연구에서는 지난 9개년의 수리부속 수요데이터를 분석하고 다양한 머신러닝을 활용하여 예측정확도를 비교·분석하고, 가장 적합한 수리부속 수요예측 모델을 제안한다.

• Journal of the Society of Naval Architects of Korea
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• v.49 no.3
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• pp.264-272
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• 2012

A study on the IR(InfraRed) signature of a naval ship has been performed using well known IR signature analysis software, ShipIR/NTCS. Variations of the IR signature radiated from skins of a naval ship have been investigated according to the monthly averaged marine climate conditions. An unclassified destroyer model with and without applying the washdown system was applied to compare the influence on the signature under the background changes. The marine background models were created from the observed data by a buoy of Korea Meterological Administration(KMA). The sensitivity of the ship signature against the climate variables such as air temperature, sea temperature, relative humidity has been studied as well. The seasons which show extreme(max, min) skin signature change by whether the washdown is applied or not. The sensitivities of the air temperature and the sea temperature for a dry-ship reversed by applying the washdown on the ship surfaces.