신뢰도 배분기법을 이용한 야전 고장률 결측값 추정

이재원,김의준,이서현,임재학 한국신뢰성학회 2024 신뢰성응용연구 Vol.24 No.1

Purpose: It is crucial to gather failure data from field operations of weapon systems and provide reliable information, such as component failure rates. However, missing data often occurs during this process, resulting in some components having missing failure rate values. This study proposes a method for estimating missing values in field failure rates using reliability allocation techniques. Methods: We examined various reliability allocation methods, including the equal, ARINC, feasibility of objective, AGREE, and comprehensive reliability allocation methods. In this study, we specifically apply the equal and ARINC allocation methods, which are deemed suitable for the situation addressed. The estimation process for missing failure rate values involves two steps: utilizing reliability allocation techniques to calculate initial estimates and then refining these estimates through a fine-tuning process. Results: Applying the method proposed in this study to estimate the missing failure rate values of components in the K2 tank, the results indicate that the ARINC allocation method outperforms the equal allocation method. Conclusion: The proposed estimation method offers an alternative solution for addressing information resulting from omitted failure records in field operations. It is also expected to be applied in the development of a failure rate databook. Furthermore, with additional factor information required for reliability allocation, other allocation methods could be applied.

반복배부법의 정확성

백태영(Tae-Young Paik) 한국관리회계학회 2003 관리회계연구 Vol.3 No.1

본 논문은 부문간의 원가배분을 가장 정확히 하는 상호배부법에 수렴하는 반복배부법의 정확성에 대해 연구한다. 반복배부법은 서로 서비스를 제공하는 보조부문간에 서로 반복적으로 원가를 몇 차례 서로 배부한 후 남은 금액을 마지막으로 생산부문에 직접배부하는 방법이다. 반복배부법에서는 상호배부법이 요구하는 동시 배부의 실무적인 어려움을 피하면서 상호배부의 효과를 실질적으로 달성한다. 반복적인 보조부문간의 교차 배부는 엑셀 등의 스프레드쉬트 프로그램을 사용하여 원하는 차수만큼 실시할 수 있다. 본 연구는 먼저 2개의 보조부문과 2개의 생산 부문이 존재하는 가장 단순한 경우를 가정하여 반복배부법의 절차를 소개한다. 다음으로, 직접배부법, 단계배부법과 비교하여 반복배부법이 얼마나 상호배부법에 근접한지를 본다. 다양한 배부율의 상황을 시뮬레이션하여 반복의 회수가 늘어날수록 반복배부법의 결과가 상호배부법의 결과에 근접하여 감을 보인다. 보조부문 2개, 생산 부문 2개의 경우에 5회의 상호배부를 한 반복배부법이 상호배부법의 결과에 상당히 근접함을 보인다. This study investigates the accuracy of the 'iterated allocation method' approximating the reciprocal allocation method, the most accurate method of allocating support departments costs. The iterated allocation method iterates several times allocation of support departments costs to other support departments and finally allocated the remaining support departments costs to production departments directly. This method can avoid practical difficulty of implementing the reciprocal allocation method and consider effectively mutual service provision among support departments in allocation procedures. Iterated allocation can be easily achieved as many times as wanted using spreadsheet programs such as Excel. This study explains the steps of the iterated allocation method in the simplest case of two support departments and two production departments. Simulation of various allocation rates settings shows that the more the allocations are iterated the closer the results of the iterated allocation methods are to those of reciprocal allocation method.

할당 공정성이 육군 공급사슬에 미치는 영향 연구: 비례할당 방식과 무작위할당 방식을 중심으로

임정혁,문성암 한국로지스틱스학회 2022 로지스틱스연구 Vol.30 No.3

Recently, Fairness has emerged as an important factor in various fields of our society, and the need for research on the effect of fairness on Army supply chains that are difficult to estimate inventory shortage costs has been raised. therefore, The purpose of this study is to analyze how fairness affects the efficiency of the Army supply chain. To this end, a research model consisting of two divisions and one logistics support brigade supporting them was created to conduct experiments separated by proportional and random allocation methods, and simulations were conducted using system dynamics based on the results of the experiment. Experiments show that soldiers generally think the proportional allocation method is fairer, but the order quantity is 1.29 times greater than the random allocation method. As a result of reflecting this in the simulation, it was confirmed that the proportional allocation method was inefficient with more inventory than the random allocation method in terms of the inventory of the two divisions and the total cost of the supply chain. As a result, it was confirmed that the proportional allocation method only provides the misunderstanding of fairness and results in inefficiency of the supply chain. This study provides management implications and future research directions based on these results.

Study on the Allocation Problem of the Equipment Maintenance Support Resources

Wang Hongxia,Ye Xiaohui,Yin ming 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.7

Aiming at the problems of lacking of system engineering method for the equipment maintenance support resource allocation problem, the problem to be solved for resource allocation is proposed from the three hierarchical perspective which is “what to allocate , how to allocate, and how much to allocate”; from the three aspects of the demand analysis, allocation method, optimizing allocation, the connotation of the problem is described, and for the each problem the essence of the problem solving method is studied systematically; the proposed method can provide science and technology support for the equipment maintenance support resources allocation scheme in the design phase.

할당방식이 해군함정 전투력에 미치는 영향에 관한 연구

이호 ( Ho Lee ),문성암 ( Seongam Moon ) 한국로지스틱스학회 2017 로지스틱스연구 Vol.25 No.2

본 연구를 통해 전시 전투함의 연료수요 대비 공급이 원활하지 못할 때, 할당방식에 따라 함 가동률과 연료효율이 어떻게 변하는지를 확인하고 적합한 할당방식을 추천하고자 한다. 이를 위해 1척의 지원함과 2척의 전투함으로 이루어진 공급사슬을 한정하여 3일 주기로 주문이 이루어지는 주기적 주문시스템을 모델링하였다. 다양한 패턴으로 일정범위의 랜덤수요를 매일 발생시키고, 청구량에 비례한 할당(비례/Proportional), 더 많이 청구한 함정에 가중치를 두는 할당(선형/Linear), 더 적게 청구한 함정을 우선 고려하는 할당(균등/Uniform), 많이 청구한 함정을 우선 지원하는 할당(편중/Bias), 청구량과 연비(속력별 연료소모량)정보를 활용하여 할당(적본/Turn&Earn)하는 경우를 테스트하였다. 결과분석을 위해서는 함정의 작전기동 제한 일수와 타 함정이 쓰고 남은 잔존량(Overage)을 비교하여 어떠한 방식이 효과·효율적인지를 확인하였다. 시뮬레이션 결과 청구량이 작은 함정에 기동할 수 있는 최소 연료 할당을 보장해주는 균등할당과 적본할당이 함정의 가동률과 연료효율을 최대로 높일 수 있었다. 그리고 수요패턴과 공급비율에 따른 상황별 우수 할당방식을 추천하였다. 이러한 결과가 군수품 공급부족상황이 발생했을 때 보다 효율적으로 할당할 수 있는 방법 연구에 활용되어 군 전투력 향상에 도움이 되기를 기대한다. This paper shows that after measuring the effect of allocation method for navy warship combat power in fuel supply shortage, we find the best allocation method for the rate of operation and fuel efficiency. Three types of R.O.K. navy warships are selected for measuring the effect of allocation method. We made a simulation settings that 1 supply ship and 2 warships. Supply ship provides fuel to both of warship and each warship order and receives it at the same period(3 days). 4 demand patterns of fuel using for navigation are simulated. The results are shown as follows : First, uniform and turn&earn allocation are the better method for the rate of operation and fuel efficiency than others. Second, the better allocation methods are changed depending on demand patterns and supply rate. We expect that the results of this study will be applied to the various supply chains and logistics fields.

광역상수도 비용배분문제에 대한 게임이론접근법 도입방안 연구

김상우,이정전 대한국토·도시계획학회 2006 國土計劃 Vol.41 No.3

Much-talked overinvestment in water supply facilities is partly due to the cost allocation problem associated with multi-regional water supply. Recognizing this fact, this paper is intended to propose a rational cost allocation mechanism that is based on the Shapley value method. The Shapley value method and it's special form, the serial cost sharing method satisfy the fairness conditions for the cost allocation. This is particularly relevant to the multi-regional water supply problem we face. Especially, the serial cost sharing method has an advantage in that it is relatively simple to apply. In addition to these two methods, this paper proposes a new version that combines the Shapley value method and the serial cost sharing method. Then, this version is applied to the case of Metropolitan water supply system. As a result of the application, it was estimated that the price of water per ton would decline by about 90 Won on the average. In addition, it was also estimated that more than 2 trillion Won could be saved in the national budget.키 워 드 광역상수도, 비용배분방법, 협조적 게임이론, 샤플리밸류, 순차적 배분방법Keywords Multi-regional Water Supply, Cost Allocation Methods, Cooperative Game Theory, Shapley Value, Serial Cost Sharing

속성의 중요도와 최대 엔트로피 순서가중합 기법을 이용한 신뢰도 할당 방안

안소영 ( So Young An ),김경미 ( Kyung Mee Kim ) 한국경영공학회 2012 한국경영공학회지 Vol.17 No.1

Reliability allocation is an important procedure in the design stage of a system in which the target system reliability is allocated to the constituent subsystems. Many different reliability allocation methods have been developed in the previous literature. All of these previous methods have assumed that attributes for evaluating complexity, environmental condition or criticality of each subsystem have the same importance. In practice, however, the designer has different importances on the subsystem attributes. In this paper, we present a methodology for incorporating attribute importance in the previous allocation method based on the maximal entropy ordered weighted averaging method. The proposed method is general including the previous allocation methods as a special case.

Task Allocation of Intelligent Warehouse Picking System based on Multi-robot Coalition

( Fei Xue ),( Hengliang Tang ),( Qinghua Su ),( Tao Li ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.7

In intelligent warehouse picking system, the allocation of tasks has an important influence on the efficiency of the whole system because of the large number of robots and orders. The paper proposes a method to solve the task allocation problem that multi-robot task allocation problem is transformed into transportation problem to find a collision-free task allocation scheme and then improve the capability of task processing. The task time window and the power consumption of multi-robot (driving distance) are regarded as the utility function and the maximized utility function is the objective function. Then an integer programming formulation is constructed considering the number of task assignment on an agent according to their battery consumption restriction. The problem of task allocation is solved by table working method. Finally, simulation modeling of the methods based on table working method is carried out. Results show that the method has good performance and can improve the efficiency of the task execution.

LDA 토픽 모델링의 적정 토픽 수 결정 방법 탐색 : 혼잡도와 조화평균법 활용을 중심으로

이대영(Dae Young Lee),이현숙(Hyun Sook Yi) 한국교육평가학회 2021 교육평가연구 Vol.34 No.1

LDA 토픽 모델링으로 텍스트 자료의 토픽을 추출하고 그에 따라 문서를 분류하고자 할 때, 설정하는 토픽 수는 토픽 분류의 정확성과 타당성에 큰 영향을 미친다. 본 연구는 LDA에서 적정한 토픽 수를 정하는 방법으로 조화평균을 사용하는 방식과 혼잡도를 사용하는 방식을 비교 검토하였다. 이에 논문 초록, 뉴스 기사, 그리고 소설 자료를 대상으로 적정 토픽 수를 추출하였으며, 추출된 토픽 수에 대한 신뢰성과 적정성을 비교함으로써 적정한 토픽 수를 보다 합리적으로 정하는 방법이 무엇인지 탐색하였다. 토픽 선정의 적정성을 판정하는 데 있어서 통계적 정보를 바탕으로 결정할 수 있을 때 보다 적절하다는 관점에서 접근하였고, 반복 시행에 의해서도 수리적으로 안정된 토픽의 수를 정할 수 있을 때 더 신뢰성이 높다고 평가하였다. 적정성 평가 준거로는 LDA 모델의 𝛾 분포와 𝛽 분포를 검토하여 확률적으로 평가하였다. 연구 결과 첫째, 조화평균 방식이 혼잡도 방식보다 연구자의 주관적 판단에 의존하는 정도가 낮았다. 또한, 조화평균 방식은 LDA 모델의 α를 조절하여 토픽이 과대 추출되는 경향을 줄일 수 있었다. 둘째, 조화평균 방식은 𝛾 분포와 𝛽 분포 측면에서도 더 독립적이고 적정한 토픽 군집으로 분류할 수 있었다. 셋째, 조화평균 방식을 적용함에 있어서 코퍼스를 구성하는 문서 자료의 특성을 고려하여 적정한 α를 정해야 함을 알 수 있었다. 이와 같은 연구 결과를 바탕으로, 조화평균 방식의 특징과 확장 가능성, 연구의 제한점 등을 논의하였다. When LDA topic modeling is used to extract topics from text data, exploring the optimal numberof topics is a critical role in establishing the validity and appropriateness of the classification. Thisstudy introduced and compared two methods for determining the number of topics in LDA: theharmonic mean and perplexity. To illustrate procedures of applying the two methods and to evaluatethe relative performance of each method over different data, four kinds of text data including theabstracts of research articles, news articles, and novel data were used. The major findings of this studyare as follows. First, the harmonic mean method was less dependent on the subjective judgment ofthe researcher than the perplexity method. In addition, the harmonic mean method was moreappropriate to facilitate the interpretation of the topics by providing a means to control the level ofα parameter in LDA that generates the most compact number of topics. Second, the harmonic meanmethod produced more independent and appropriate topic clusters in terms of 𝛾 and 𝛽 distributions.Third, in applying the harmonic mean method, an appropriate level of α parameter should becarefully determined in consideration of the characteristics of the documents in the corpus. Based onthe findings, strengths of the HM method along with the limitations of the present study werediscussed.

열병합 발전에서 엑서지를 이용한 BM계수 개발

최상미(Sang Mi Choi),정민규(Min Kyu Jung),임현정(Hyun Jeong Lim),김민성(Min Sung Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-

Like the EU and many other country, the emission trading scheme has also been started in korea. And the selection of the CO2 allocation method in CHP has become more important than ever. Because CHP is effective for CO2 reduction but difficult to allocate CO2 to the simultaneously produced heat and electricity. Korea tends to apply the BM method in the CO2 emission allocation. In the BM method, there are various methods for calculating BM coefficients. The method using exergy is known to be most thermodynamically appropriate. However, the exact methodology and research on this has not been advanced. There are many ways to use exergy in the same way as the widely known enthalpy-based method, and we will analyze the characteristics of this method and compare it with the existing method.