• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.3
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• pp.269-275
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• 2020

RAM of elements to support weapon systems is conducted at the initial development phase and standard is suggested to accomplish strategy requirement performance from a design spec. Operational availability is a key point of the military's ability to ensure combat readiness and to win the battle. In the weapon system development phase, operational availability is used as a development standard. The military provides ALDT, operation and standby time, which are elements of operational availability. ALDT is a key element of operational availability that must be maintained for combat readiness, as it depends on the aging of a weapon system, maintenance policies and geographical conditions. Operational Availability to be set at the development phase has many differences from the operational availability that is analyzed in the actual operational phase because ALDT is applied as a simple assumption. In the paper, we analyzed ALDT applying the decision tree method through failure data acquired from initial operation. Through this study, we have devised the optimal ALDT setting method to achieve operational availability about operation when the weapons system is unstable.

• Proceedings of the Korean Reliability Society Conference
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• 2001.06a
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• pp.503-511
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• 2001

신규 개발되는 기동장비의 RAM-D 요구조건 설정방법에 관하여 기동 무기체계의 대표적 장비인 전차를 대상으로 연구하였으며, 사용자의 장비운용에 대한 요구 가용 능력 및 운용유지 조건을 고려한 RAM-D 요구조건 설정절차 및 분석 모델을 개발하였다.

• Journal of Internet Computing and Services
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• v.23 no.1
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• pp.105-112
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• 2022

The national defense requires uninterrupted decision-making, even under direct or indirect impacts on non-traditional threats such as infectious diseases. Since all work utilizes the information system, it is very important to ensure the availability of the information system. In particular, in terms of security management, defense work is being performed by dividing the network into a national defense network and a commercial Internet network. This study suggests a work execution plan that takes into account the efficiency of work performed on the Internet and the effectiveness of security through effective defense information system operation. It is necessary to minimize the network contact point between the national defense network and the commercial Internet, and to select a high-priority one among various tasks and operate it efficiently. For this purpose, actual cases were investigated for "A" institution and characteristics were presented. Through the targeted tasks and operation plans to improve the effectiveness of defense tasks and ensure security, presented in this paper, it will be possible to increase the availability of task performance even in non-traditional threats such as infectious diseases.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.3
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• pp.433-440
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• 2022

High Altitude Long Endurance(HALE) solar powered UAV is the vehicle that flies for a long time as solar power energy sources. It can be used to replace satellites or provide continuous service because it can perform long-term missions at high altitudes. Due to the property of the mission, it is very important for HALE solar powered UAV to have maximum flight time. It is required for mission performance to fly at high altitudes continuously except a return for temporary maintenance. Therefore mission availability time analysis is a critical factor in the commercialization of HALE solar powered UAV. In this paper, we presented an analytic model and logic for available time analysis based on the design parameters of HALE solar powered UAV. This model can be used to analyze the possibility of applying UAV according to the UAV's mission in concept design before the UAV detail design stage.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.12
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• pp.110-117
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• 2018

Recently, as weapon systems have become more complex and multi-functional, the difficulty of the operation and maintenance of weapon systems in the military have become increasingly difficult. On the other hand, the service period of operations and maintenance workers who perform operations and maintenance has been shortened, and the skill of system operation and maintenance has been lowered. This complexity and multi-functionality of equipment cause malfunctions and errors of users and maintenance personnel, and degradation of the reliability affects availability and combat readiness. In addition, life cycle costs have been gradually increasing. Therefore, I would like to suggest an improvement plan of the design of weapon systems and ILS (Integrated Logistics Support) in order to examine the implications of failure in the military. The weapon system is operated in the ROK Navy. Data from 730 cases of failure of weapon systems was collected, and analyzed. The results of the analysis are classified into failures that can be prevented in advance and failures that cannot be prevented. This shows the portion of preventable failures in weapon systems and proposes measures to minimize failures.

• Journal of Advanced Navigation Technology
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• v.3 no.2
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• pp.185-195
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• 1999

항공이동통신분야에서는 아날로그형 음성통신의 한계점을 극복하고, 운용자의 업무 부담을 경감할 목적으로 항공이동데이터통신망(VDL)을 이용한 데이터 통신이 항공운용통신(AOC) 분야에서 발전되었으며, 이를 항공교통서비스(ATS) 분야에 적용하기 위한 연구가 국제민간항공기구(ICAO)의 CNS/ATM 구축 권고에 의하여 미국, 유럽 등 항공 선진국에서 진행되고 있다. 본 논문은 항공교통서비스 분야에 VDL을 이용한 데이터 링크 서비스를 제공하기 위하여 디지털형의 출발전비행허가(PDC) 시스템을 개발한 내용의 결과이다. 개발된 PDC 시스템은 하나의 PC급 단일 시스템으로 항공교통관제소, VDL 통신망, 관제사 등이 원격으로 연동되어 실시간 및 동시에 PDC 정보를 처리하여야 한다. 이를 위하여 제안된 기법은 하나의 프로세서에 여러 개의 쓰레드를 갖는 멀티 쓰레드 방식이 도입되어 설계되었다. 멀티 쓰레드 방식이 사용된 이유는 시스템의 간소화, 효율적인 내부 자원의 이용, 데이터 처리에 있어서 우수한 성능을 발휘하기 때문이다. 본 논문은 김포공항 PDC 시스템의 구조 및 설계 내용을 기술하고, 실제 운용 결과에 대한 데이터를 분석하였다. 김포공항 PDC 시스템의 운용결과를 이용한 분석한 결과, 운용초기단계로 모든 항공기에 시스템이 구축되지 않아 매일 평균 25대의 항공기가 운용하여 평균 10%의 이용률을 나타내며, 최대 34대의 항공기가 이용하고 있다. 메시지 송/수신에 걸리는 시간을 분석한 결과, 항공기의 PDC 요청부터 MAS의 수신에 소요되는 시간은 최소 14초부터 최대 983초(16분 23초)까지로써, 평균 122초(2분 2초)의 시간을 나타내었다. 또한 신뢰성을 확인하기 위하여 가용도를 계산한 결과 99.7%로써 상당히 신뢰할 수 있는 수준이었다. 또한, 다중 처리를 위하여 사용된 방식인 멀티 쓰레드 방식이 적절히 동작함을 확인할 수 있었다. 앞으로, 전체 연동 시스템이 자동화로 구축될 경우, PDC의 요청부터 발송 및 확인까지 상당히 짧은 시간 내에 이루어져 관제업무 능률을 향상시킬 수 있을 것이다.

• The Journal of the Korea Contents Association
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• v.12 no.12
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• pp.395-412
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• 2012

RAM analysis using field data is important and useful for acquisition and operation of weapon systems. But this kind of analysis didn't conducted due to the absence of weapon system's failure data in case of warship. This study suggest failure tracking process based on maintenance and repair parts consumption data and proves suggested method enables conducting RAM analysis. This method obtains validity through field operator's reviews. The results on 9 warships in this study significantly correspond with weapon system operator's experiences. Because the result of this study contains effects of various operational environments in field, it will useful for correction and verification on existing another weapon system's RAM estimates. If this kind of RAM data are sufficiently accumulated, it will be used to DB of korean unique RAM analysis.

• Korean System Dynamics Review
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• v.11 no.2
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• pp.119-138
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• 2010

This study introduces the system dynamics model that simulate total operational availability when 10 equipments made of 3 major components are serviced under the constrains of the maintenance capacity level and the number of spare parts. This simulation is designed on the base of reliability engineering concept so failures of components happens with the rule of engineering factors like the mean time between failure(MTBF) of component and the next failure time of one component is effected by the conditions of other components. We analysed availability of 10 equipments under 121 constrains and executed multiple regression analysis with the simulation result. The analysis provide the managerial insight in the service fields with operation many equipments.

• Journal of the Korea Institute of Military Science and Technology
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• v.16 no.3
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• pp.295-303
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• 2013

The Operational Mode Summary/Mission Profile(OMS/MP) is a document which describes how a system or training device will be used in wartime and/or peacetime at the time it is field with focus on the future. OMS/MP is also typically used for the RAM goal setting in an early phase of weapon system development. This paper provides OMS/MP and RAM goal of the Next-MILSATCOM which is following military satellite system after ANASIS. We propose operational concepts, user-side OMS/MP model and RAM goal.

• Journal of the Korea Institute of Military Science and Technology
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• v.23 no.2
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• pp.168-175
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• 2020

Failure of essential avionic equipments have a significant impact on the operations and safety of P-3 maritime patrol aircraft. Therefore, avionic equipments of P-3 are required to have higher reliability. Based on the field failure data, this paper studies the reliability growth of essential avionic equipments in P-3 using Duane model. Additionally, a simulation model is built and implemented for identifying the operational availability according to the field failure data of avionic equipments.