• Journal of the Korea Society for Simulation
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• v.20 no.4
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• pp.127-138
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• 2011

Certified Missile Round Concepts that is one-shot device use the periodic inspection policy to improve the continuously deteriorated reliability. In this paper, we suggest dormant reliability prediction model by simulation with real operational environment. The suggested prediction model is based on optimal inspection period decision model and additionally considers various constraints; moving, inspection or repair service time. The simulation results show the constraints affect dormant reliability and missile availability. Lastly, we suggest building up a depot to resolve the above problems by the suggested simulation model.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1580-1584
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• 2010

지역기후모델 RegCM3 이용하여 역학적 상세화 이중둥지격자체계를 구축하고 관측, ECHO-G/S의 20C3M 및 SRES A2 시나리오를 이용하여 동아시아(60km 분해능)와 한반도(20km 분해능)에 대한 현재 및 미래(1971-2100, 130년)의 기후변화 시나리오 자료를 생산하였다. 미래 동아시아와 한반도지역은 기온상승에 의해 대기 중 수증기 함유량 증가와 여름 몬순의 강화로 전 계절에 걸쳐 강수량이 증가하고 토양수분, 증발산도 증가할 것으로 전망되었다. 상세화된 일(daily)강수량 자료를 일반극치(general extreme value, GEV)분석을 활용하여 20세기 동안 한반도의 일최대강수량의 공간 분포를 분석하고 미래 강수의 일최대강수량 변화를 전망하였다. 20세기 (1971-2000)에는 남해안과 경기 내륙지방에서 일최대강수량의 빈도와 평균값이 나타났다. 21세기에는 일최대강수량의 평균은 현재보다 약 10 $mmday^{-1}$, 20년 빈도 강수량은 60 $mmday^{-1}$ 정도 증가할 것이고, 남해안과 서해안과 충청내륙일부지방, $39^{\circ}N$ 이북에서 뚜렷이 나타날 것으로 전망되었다.

• Journal of The Korean Digital Architecture Interior Association
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• v.12 no.2
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• pp.67-76
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• 2012

BIM and its quantity take-off widely apply to the construction projects and LCCO2 Assessment using the BIM's quantity take-off function can be tried recently. Because BIM modeling programs such as Revit and ArchiCAD do not provide adequate library for LCCO2 Assessment, quantity take-off data should be conversed and applied to Carbon Emission Coefficient using Excel program or manual work. Therefore, the purpose of this research is 1) to propose the Unit Conversion Systems for Carbon Emission Coefficient, 2) to provide basic library sets for BIM based LCCO2 Assessment method, and 3) to apply 11 material library sets on a apartment unit plan modeling to pursue the CO2 emission evaluation of the material production in the process of LCCO2 Assessment. Research results showed CO2 emission amount of 458.64kgCO2/m2 from the apartment unit plan modeling.

• Journal of the Korea Institute of Military Science and Technology
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• v.23 no.4
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• pp.417-425
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• 2020

Multi-resolution modeling(MRM) is required when simulating objects in variable resolution and can be applied for interoperating systems, which simulate objects in fixed resolution. However, most interoperation middleware do not support MRM, so participating models must handle several issues to simulate MRM system. In this paper, we propose an interoperation system, which is composed of several different resolution models, based on the High Level Architecture and Run-Time Infrastructure(HLA/RTI). In the proposed architecture, each model participates to a HLA federation through MRM adapter application, which supports data resolution conversion and HLA services while communicating with the model. MRM adapter application can be implemented based on an MRM adapter, and an adapter application development tool is proposed to support developing the application. Using the tool, developers can easily implement data resolution conversion component plugged-in HLA adapter. A case study is implemented in the proposed MRM system, and shows that models of different resolution works successfully with dynamic resolution changes.

• Journal of the Korean Society for Marine Environment & Energy
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• v.8 no.4
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• pp.193-202
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• 2005

Marine risk assessment considers events such as collision/grounding, sinking/capsize, fire/explosion and flooding, developing relationships between their causes and effects. In addition, risk assessment of previously sunken ships are also necessary since they continuously have possibility for further oil spill or can cause other marine accidents. The objective of this paper is to develop the risk assessment systems for sunken ships to prevent oil spill and further marine causalities in order to preserve safe and clean oceans around Korea peninsula. The risk assessment systems for sunken ships comprise of database management sub-system for sunken ships, qualitative risk assessment sub-system, quantitative risk assessment sub-system, and cost-benefit analysis subsystem.

• Journal of the Korea Institute of Military Science and Technology
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• v.17 no.4
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• pp.395-403
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• 2014

Recent technological advancement has a profound effect on the ways that the war is being conducted and fought. The advanced communications, information, computing and sensor technologies enable the combat units to be integrated in the battlefield management network. By exchanging and sharing real-time battlefield information that is critical for the successful outcome of military engagement, the legacy forces are becoming much more effective and lethal than ever before, The bigger picture of such phenomena can be summarized as the concept of Network Centric Warfare(NCW). The main purpose of this study is to compare the outcome of regional combat engagement between the legacy forces and the future combat systems(FCS). The FCS capitalizes on the advanced technologies within the frame of NCW. This study uses the modeling and simulation methodology to assess the effectiveness of two different combat forces. The simulation results show that the FCS is more effective, hence vindicating the superiority of technologically advanced combat units.

• Journal of Power System Engineering
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• v.15 no.5
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• pp.16-21
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• 2011

The large scale decisive battle will be gradually reduced on the sea in the future and surface combatant ship installed advanced weapon units as well as propulsion system will be continuously increased. The high level of military technology leads to appear state-of-the-art weapon system using high power energy. As a results, fossil fuel powered main prime mover as diesel engine and gas turbine which are composed of mechanical propulsion system should be decreased from combatant ship in the near future. The new building naval combatant ship with the latest technology has electric based propulsion method of the hybrid type combined with mechanical and electrical drive. U.S. and Royal Navy, especially, select the integrated fully electric based propulsion system for the next generation combat ship and play an important roll for developing them. In this context, this paper was focused on the deduction of implications through analyzing the combatant ship propulsion system using diesel and gas turbine engine which are promoted on the worldwide.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.340-340
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• 2012

하천의 정밀한 유량관측은 수자원의 확보 및 효율적인 관리에 가장 기본적으로 수행되어야 하며 하천유량측정에 사용되는 기존의 방법으로는 유속계를 이용하여 평수기 때의 유속을 관측하는 방법과 홍수기시에 봉부자를 이용한 관측방법이 널리 이용되어 왔다. 하지만 기존의 관측방법은 경제성 및 효율성면에서 뒤떨어지기 때문에 새로운 측정방법을 개발하기 위한 연구가 활발히 진행되고 있다. 최근에는 한국수자원공사에서 개발된 전자파표면유속계를 이용하여 홍수유량을 관측하는 방법과 영상처리기술을 이용하여 관측하는 방법들이 다양하게 이용되고 있으며 본 연구에서는 표면영상유속계(SIV, Surface Image Velocimertry)를 이용하여 유량을 관측하였으며 동시에 전자파표면 유속계를 이용하여 관측된 값과 비교 분석하였다. 표면영상유속계(SIV, Surface Image Velocimertry)는 동영상 카메라를 이용하여 강이나 하천의 표면 유동을 촬영하고, 영상을 초당 30프레임으로 분석하여 변위를 구한다음 영상들의 시간 간격을 이용하여 최종적으로 표면 유속을 구하는 방법이다. 여기에 표면 유속과 평균 유속의 관계(노영신, 2005)를 이용하고, 하천 횡단면을 적용하여 유량을 산정하는 기법이다. SIV 기법을 이용하여 제주도 한천유역에 적용하여 전자파표면유속계의 관측 값과 비교한 결과 2~3m/s의 유속 분포를 보이고 있으며 통상적으로 관측된 홍수 유출시의 유속과 근사한 값을 보이고 있다. 향후 다양한 유출 사상에 대하여 SIV 기법을 적용하여 검증하고 동시에 다양한 유량 관측 기법과 비교 검토한다면 제주도의 체계적인 유량 관측 기술을 확립할 수 있을 것으로 판단된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.149-151
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• 2014

DVB-S2/RCS (Digital Video Broadcasting - Satellite/Return Channel via Satellite)는 위성 방송 및 데이터 통신을 위한 표준으로서 높은 통신 품질 및 향상된 위성 자원 이용을 위해 수립되었다. DVB-RCS 의 MF-TDMA (Multi-Frequency Time Division Multiple Access)는 동적인 자원할당이 가능하며, 이에 따라 통신 요구 사항이 증가하는 군 위성 통신 체계로의 적용 연구가 활발하게 진행 중이다. 그러나 기존 MF-TDMA 위성 통신은 군 통신에 필수적인 항재밍에 대한 고려가 부족한 실정이다. 부분대역 재밍시, 다구의 RCST (Return Channel Satellite Terminal)에 통신 저하를 초래 할 수 있으며, 망 자원을 관리하는 제어 채널의 재밍으로 다수 RCST 의 채널 탈퇴를 초래할 가능성이 있다. 본 논문에서는 부분대역 재밍 시 RCST 의 통신 저하를 최소화하며, 제어 채널 재밍으로 인한 다구 RCST 의 채널 탈퇴를 예방하는 자원할당 알고리즘을 제안한다. 제안 기법은 다양한 대역폭을 지원하는 MF-TDMA 에 적용 가능함으로써 다양한 장비가 혼재하는 군사 환경에 매우 적합하다. 시뮬레이션을 통해 제어 채널의 재밍 확률과, RCST 의 자원할당 효율을 기존 자원할당 알고리즘과 비교하였으며, 제안한 알고리즘이 우수한 성능을 보임을 확인 하였다.

• The Journal of Internal Korean Medicine
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• v.42 no.3
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• pp.259-278
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• 2021

Objectives: This study examines the effect of Sagunja-tang on functional dyspepsia (FD) through a systematic review and meta-analysis of a randomized controlled trial (RCT). Methods: A search for RCTs that tested the effect of Sagunja-tang on functional dyspepsia was conducted in Medline, Embase, PubMed, CENTRAL, CiNii, CNKI, NDSL, RISS, OASIS, and KISS databases on November 8, 2020, with no limit on the year of publication. A meta-analysis was performed by synthesizing the findings, including total efficiency, clinical symptom score, myosin light-chain kinase (MLCK) level (pg/mL, and gastric half-emptying time (min). RevMan 5.4.1 software was used for data analysis. The quality of the literature was evaluated using Cochrane's risk of bias (RoB) tool. Results: A total of 14 RCTs met the selection criteria. As a result of the meta-analysis, the treatment group had higher total efficacy and MLCK levels (gastric antrum, jejunum) than the control group, and the clinical symptom score and gastric half-emptying time were lower. However, due to the low quality of the included RCT and the small sample size, the results may be slightly biased.