Capacity Pooling을 활용한 육군항공 통신장비의 적정예비품수 결정에 관한 연구

윤봉규 ( Bong Kyoo Yoon ),차건호 ( Kwon Ho Cha ) 한국로지스틱스학회 2008 로지스틱스연구 Vol.16 No.1

Important facilities and equipment need to operate spare ones in order to provide reliability or availability in an event of unexpected situations. We call these auxiliary facilities or equipment as Maintenance Float (M/F), and especially at military where reliability and availability are crucial, securing of M/F for every important equipment is a must. However, securing M/F entails an increase in defense budget, and this is why the military has to make decisions on optimal spare level at which the military can earn maximum effects with minimum cost. Meanwhile, pooling is an effective method that can reduce inefficiency which can be caused by volatility, because by sharing uncertainties and volatility, it offsets various uncertainties. In this paper, we aim to provide a model, which is developed on a queuing model, in order to help the military aviation unit decide on optimal M/F volume level. In addition, based on the model, we calculate the difference in the number of appropriate M/F units with a pooling, and without a pooling. And, we believe this will present an optimal level of M/F units for the military aviation unit, as well as reduction effects in the number of M/F unit, with the pooling system in place.

흡수 마코프체인을 활용한 함정 근접무기체계 효과성 분석

김성우,윤봉규,Kim, Seong-Woo,Yoon, Bong-Kyoo 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.6

Since the technology of anti-ship missiles has advanced rapidly, defending battleships from the threat of anti-ship missiles is a crucial factor for the survival of warships. In this paper, we analyze the performance of an anti-ship missile defense system whose name is Close-In-Weapon-System. We show the survival probability of a warship equipped with the Close-In-Weapon-System as the number of anti-ship missiles attacking the warship varies. Because of the complex and dynamic operational characteristics surrounding the Close-In-Weapon-System such as speed of missiles, different range of an individual weapon in the weapon system, and the continuous change of the kill probability of the missiles corresponding to the distance of missiles from ships, few work has been done for the performance of Close-In-Weapon-System. We present a model to incorporate all the dynamic characteristics of the system using absorbing Markov Chain. With our results, we expect commanders of warships equipped with Close-In-Weapon-System to be provided with more helpful information on how to deal with the anti-ship missiles.

흡수 마코프 체인을 활용한 적정 M/F 재고 수준에 관한 연구

김용,윤봉규,Kim, Yong,Yoon, Bong-Kyoo 한국국방경영분석학회 2008 한국국방경영분석학회지 Vol.34 No.2

The military is an organization where reliability and availability take much more importance than in any other organization. And, in line with a recent trend of putting emphasis on 'system readiness', not only functions but also availability of a weapon system has become one of achievement targets. In this regard, the military keeps spares for important facility and equipment, which is called as Maintenance Float (M/F), in order to enhance reliability and availability in case of an unforeseen event. The military has calculated yearly M/F requirements based on the number of equipment and utilization rate. However, this method of calculation has failed to meet the intended targets of reliability and availability due to lack of consideration on the characteristics of equipment malfunctions and maintenance unit's capability. In this research, we present an analysis model that can be used to determine an optimal M/F inventory level based on queuing and absorbed Markov chain theories. And, we applied the new analysis model to come out with an optimal volume of K-1 tank M/F for the OO division, which serves as counterattack military unit. In our view, this research is valuable because, while using more tractable methodology compared to previous research, we present a new analysis model that can describe decision making process on M/F level more satisfactorily.

데이터마이닝을 이용한 공군 무기정비병의 조기 숙달을 위한 배속방안 연구

강규영,윤봉규,Kang, Kew-Young,Yoon, Bong-Kyoo 한국국방경영분석학회 2011 한국국방경영분석학회지 Vol.37 No.1

Recently, the military service period has been shortened continuously. Meanwhile, more skilled airmen are needed as the complexity of weapon systems increase. This phenomenon could lead to a disastrous result such as deteriorating the level of the readiness and the fighting power. We suggest a method to improve recruit's maintenance capability rapidly by assigning airmen to jobs appropriate to their characteristics using Datamining methods (K-menas and CART). We focus on the assigning method for air force's air-munition maintenance airmen since they are requested more skilled than other airmen. Grouping airmen with k-means method and devising classification rule with CART algorithm, we found that airmen's proficiency arrival period could be shortened by 1.79 months when they are assigned in the suggested way.

게임상황하에서 Capacity Pooling 효과에 관한 연구

남윤진(Yoon-Jin Nam),윤봉규(Bong-kyoo Yoon) 대한산업공학회 2012 산업공학 Vol.25 No.4

Since pooling is a popular scheme in many areas to attain operational excellence, many researchers investigated the performance of pooling systems. However, rare research could be found on pooling with game situation which has much applicability to real world phenomenon. We analyze the performance of noncooperative pooling system with two servers having different sharing capacity. We investigate the sensitivity of the advantage of capacity pooling on the variation of system parameters, including sharing capacity numbers, pooling probability, pooling strategy and traffic intensity. As a result, we suggest an efficient control policy which facilitate the performance of pooling in a game situation.

무선인지기능 무전기의 적정 재고수준 산정 모형에 관한 연구

김영묵,최경환,윤봉규,Kim, Young-Mook,Choi, Kyung-Hwan,Yoon, Bong-Kyoo 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.4

Cognitive Radio(CR) is the technology that allocates the frequency by using dynamic spectrum access. We proposed a model to calculate the optimal level of the cognitive radiotelegraph, where secondary users opportunistically share the spectrum with primary users through the spectrum sensing. When secondary user with cognitive radio detects the arrival of a primary user in its current channel, the secondary user moves to the idle channel or be placed in the virtual queue. We assume that the primary users have finite buffers and the population of secondary users is finite. Using a two-dimensional Makov model with preemptive priority queueing, we could derive the blocking and waiting probability as well as the optimal level of cognitive radiotelegraph under a various range of parameter circumstances.

항공기 운용 특성을 고려한 적정 운용 대수 산정 기준 연구

손영수,김성우,윤봉규,Son, Young-Su,Kim, Seong-Woo,Yoon, Bong-Kyoo 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.1

In this paper, we consider a method to access the number of aircraft requirement which is a strategic variable in national security. This problem becomes more important considering the F-X and KF-X project in ROKAF. Traditionally, ATO(Air Tasking Order) and fighting power index have been used to evaluate the number of aircrafts required in ROKAF. However, those methods considers static aspect of aircraft requirement. This paper deals with a model to accommodate dynamic feature of aircraft requirement using absorbing Markov chain. In conclusion, we suggest a dynamic model to evaluate the number of aircrafts required with key decision variables such as destroying rate, failure rate and repair rate.

운용가용도를 고려한 최적 여유장비 수준 연구

손휘민 ( Whi Min Son ),윤봉규 ( Bong Kyoo Yoon ) 한국로지스틱스학회 2008 로지스틱스연구 Vol.16 No.2

Deadline이 존재하는 군 정비시스템의 긴급 정비 인력 수준에 관한 연구

김성우 ( Seong Woo Kim ),윤봉규 ( Bong Kyoo Yoon ) 한국로지스틱스학회 2015 로지스틱스연구 Vol.23 No.3

Since the concept of deadline is inevitable in most decision situations arising in defense area, it is important to incorporate the phenomena in the analyses. Nevertheless, most analytic research in the military logistics ignore the concept of deadline because of the complexity of the analytic models. Meanwhile, queueing theory has given a breakthrough to deal with the concept of deadline using queues with impatient customers. We use the method in queueing theory to analyze the optimal level of the number of emergency maintenance personnel whose service is useless unless it is provided within a certain amount of time period. In addition, our analytic model is based on the non-exponential assumptions on the occurrence patterns of breakdowns and repairs, which naturally leads to using the Phase-type distribution.

해군 함정 정비체계 최적 정비인력 할당 모형 연구

김성우(Kim, Seong-Woo),윤봉규(Yoon, Bong-Kyoo) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.3

해군 정비체계는 전투함정을 수리하는 역할을 수행한다. 한국 해군은 전투함정의 전비태세를 최대화하기 위해 4개 의 정비창을 운용하고 있다. 각 정비창은 함정 유형, 정비 종류, 정비 능력에 따라 다른 정비 서비스를 제공하는 특성으로 인해 정비인력을 각 정비창에 최적으로 할당하는 것은 어려운 문제가 되고 있다. 이에 따라 본 연구에서는 정비창의 성능척 도에 중요한 영향을 미치는 정비인력의 할당 측면에서 정비창의 운용을 연구하였다. 대기행렬 네트워크 이론, 분해 및 최적 화 기법을 이용하여 본 연구에서는 정비체계 내 대기 중인 고장 함정의 수를 최소화할 수 있는 정비인력 할당 모형을 제시한다 Naval maintenance system carries out repairs of battle ships. Korean Navy has four maintenance stations to maximize the readiness of the battle ships. Since each station can provide different services according to characteristics(specific size of ships, type of maintenances) and the maintenance ability of stations is predetermined, it has been one of complex problems for the Korean Navy to find the optimal resource allocation. We investigate the operation of the stations from the perspective of the human resource allocation which plays crucial role in the performance of the maintenance stations. Using a queueing model and optimization technique, we present a way to derive the optimal personnel allocation which minimize the waiting number of battle ships at each station, leading to the improvement of the military readiness in the Korean Navy.