한국경영과학회:학술대회논문집 (Proceedings of the Korean Operations and Management Science Society Conference) (Proceedings of the Korean Operations and Management Science Society Conference)
한국경영과학회 (The Korean Operations Research and Management Science Society)
- 반년간
과학기술표준분류
- 경제/경영 > 경영정보/e-비즈니스
한국경영과학회 2007년도 추계학술대회 및 정기총회
-
In the traditional inventory problem, market parameters such as demand and selling price are exogenous. But incorporating these factors into the model can provide an opportunity for increasing the total profit. So we investigate the joint price-inventory policy in a supply chain consisting of a single retailer and a single manufacturer. Demand at the retailer depends on the retail price. The retailer and the manufacturer cooperate closely each other to maximize overall profit of the supply chain. The mathematical model is presented and the solution procedure is developed in order to jointly determine the optimal policy including the retail price, the production lot sizes, and the delivery frequency from the manufacturer to the retailer.
-
This paper considers a shipment planning of products from manufacturers to a third-party warehouse for demands with production time windows where a demand must be replenished in its time window. The underling lot-sizing model also assumes cargo delivery cost in each inbound replenishment to the warehouse. For this model, an optimal O(
$nT^4$ ) is presented where n is the number of demands and T is the length of the planning horizon. -
Online parallel machine scheduling problems have been studied by many researchers and enormous results are appeared in the last 40 years. With the development of scheduling theory and application, new online scheduling problems where the partial information is known in advance, that is, semi-online, gained much interest due to their increased application in practice. So we consider the online scheduling of three machines with general eligibility and its semi-online variant where the total processing time is known in advance. For the online and semi-online problems, we develop algorithms with competitive ratio of 5/2 which are shown to be optimal.
-
At an integrated steel mill, raw materials such as coal and iron ore are discharged by ships through multiple unloaders. The discharged raw material is then transported to storage yards through multiple routes established simultaneously on a fairly complicated belt conveyer network. Formulating an efficient unloading schedule is a quite cumbersome task due to the insufficient number of berths and unloaders as well as the potential conflict among routes being used simultaneously. In this paper, we propose a solution approach to the scheduling problem and describe the prototype system that we built as an implementation of our approach.
-
As the service industry continues to grow in importance, a new research field called service science has formed so as to conduct more comprehensive and scientific analysis of service. However, much further research is required until we can develop the common terminology and methodology for service design and improvement. A foundational step toward this is giving a lucid definition to service which reflects the intrinsic qualities of it. Many of the service definitions mentioned in existing studies had the limitation that they considered service as the residual from physical products, or tried to conceptualize service based on some characteristics. In this paper we compare and analyze existing studies, discuss about the essential nature of services, and suggest a more comprehensive investigation into service.
-
Many problems related to airline business belong to large-scale optimization problems, so that it is expected that the state-of-art optimization techniques are widely applied to making the airline operation effective and competitive. This paper introduces the concepts and mathematical models of various optimization problems in airline system. Airlines involve many activities that utilize airline resources such as aircrafts and crews to make profit. We view the airline activities in the planning and operational aspects. In the planning viewpoint, we discuss the flight schedule design problem that impacts on passenger demand directly. For aircraft and crews, we deal with fleet assignment, aircraft routing, crew pairing optimization, and crew assignment problem. In the operational viewpoint, we concern schedule recovery problems for aircrafts and crew using the method of reassigning available resources when airlines face with the unexpected situations.
-
In this paper, we identify the factors of supplier service quality, and explore the relationships between these factors and customer satisfaction, and between these factors and customer loyalty. Through empirical analysis, the five factors, such as technical ability, information service, service flexibility, delivery reliability, and after service, are identified. The analysis also shows that information service and service flexibility influence customer satisfaction, and service flexibility and after service influence customer loyalty.
-
This paper considers the technological competitiveness of aircraft infra industries that are bases of the aircraft industry development in Korea. We performed focus group interviews to aircraft industry specialists and classified the aircraft infra industries by eight fields: metallurgical assembly, general machinery, precision instruments, materials & parts, communication appliances, computer, semi-conductor/ electronic component, electronics. Through the United States patents analysis for the G7 countries and Korea during 1995-2006, we identified the technological specificities and competences of each country. RTA(Revealed Technology Advantage) index and CII(Current Impact Index) are used to examine the technological specificity and technological competence respectively. Finally, we introduced TCI(Technological Competitiveness Index) which could reflect quantitative level as well as qualitative level of patents for each aircraft infra industry. The results show that Korea has occupied the technological competitiveness in the semi-conductor and electronic component industry out of eight aircraft infra industries, and achieved a competitive edge in communication appliance industry in the mid 2000s.
-
Recently, as the management environments are changing rapidly and the uncertainty is becoming larger, the needs of internal control for management and IS become stronger. In order to construct a new internal control system for IS, it is necessary to evaluate the former research of the system. This study emphasizes the importance of effective internal control system, presents a conceptual framework for the preceding factors to consider, and verifies empirically the framework. This study sets the organization citizenship behavior, IS innovation resistance, and IT capability from the viewpoint of Socio-Technical system as the preceding factors for the effectiveness of internal control system. A research model, affecting the above factors on IS capability as a mediating variable of the internal control effectiveness for the use of IS, is set up. PLS-Graph 3.0 is used to verify the model. We found that the internal control effectiveness have affirmative effect on information capability, a surrogate variable of the IS effectiveness and a mediation effect is meaningful.
-
This study addresses manufacturers' ability to influence their supply chain network in order to adapt to their competitive environment. From the perspective of a manufacture, the supply chain comprises a network of suppliers and customers, and is theoretically viewed as a complex adaptive system. This study considers the following questions: (1) How can adaptability of supply chain network be operationally defined? (2) How does adaptability of supply chain network lead to combinative capabilities? (3) What is the influence of adaptability of supply chain network on business performance? Drawing on literature streams in supply chain management, operations strategy, organizational change and learning, and complexity theory, this study develops and tests the constructs and operational measures of adaptability of supply chain network and model the nomological set of relationships among constructs that form the basis of our theory. This study then develops and tests a model describing the outcomes of adaptability of supply chain network and its influence on combinative capability and business performance. Empirical results of this study show that adaptability supply chain network directly and positively affects combinative capability. Further, this study finds that adaptability of supply chain network does not impact business performance directly, but rather is mediated through combinative capability, which provides the requisite variety for firms to survive and thrive in dynamic environments.
-
In multi-location inventory systems, lost sales due to stockout decreases not only retailers' profit but also whole supply chain's profit. Transshipment between retailers has been considered to be a major solution to the stockout problem, and many supply chains implement transshipment coalition among retailers. However, in practical situations, retailers occasionally refuses to accept the transshipment requests, mainly because they concern the future stockout possibilities of their own. Thus, the objective of this research is to analyze the effect of retailers' interaction under the transshipment coalition environment based on the simulations, and to provide effective policies to promote retailers' transshipment cooperation. Policies using penalty and incentive scheme are proposed, and it is shown that using proposed policies both the retailers' and the headquarter's profit can be increased.
-
오늘의 기업은 내부 조직, 업무 프로세스, 정보기술 측면에서 많은 문제점을 가지고 있고, 대외적인 기업 환경이 수시로 바뀌는 등 어려운 상황에 직면하고 있다. 이런 내부적인 문제를 해결하고, 외부 환경변화에 신속하게 대응할 뿐만 아니라 전사적 자원을 체계적으로 관리하고, 경영을 효율화하기 위하여 ERP 를 도입하고 있다. 이러한 도입 목적을 달성하기 위하여 모기업은 2004년 부터 협력사 경영관리력 향상 및 협력사와의 구매 SCM(Supply Chain Management) 연계를 통한 협업체계 구축을 목표로 협력사의 ERP 구축 및 5대 구축 자금 및 전문 인력을 지원하였다. 또한 시스템구축 지원 뿐만이 아니라 시스템 활용도 제고 활동을 위하여 ERP구축 및 SCM 연계가 완료된 업체를 대상으로 변화관리 컨설팅을 지원하였으며, 매년 정기적인 정보화평가를 수행하여, 문제점을 파악하고 문제점을 제거하기 위한 활동을 수행하게 되었다. 이와 같은 변화관리 컨설팅을 통한 시스템 활용도 제고활동이 정보시스템 전체에 미치는 영향 및 성과가 지대함을 인식하게 되었고, 이에 본 논문에서는 ERP 및 구매 SCM 시스템 구축 후 운영 안정화 및 변화관리 활동을 주요 연구대상으로 하여 변화관리 수행방안 및 수행내용, 변화관리 활동을 통한 성과에 대하여 중점적으로 연구하였다.
-
In this paper, we propose the coordination scheme in a single-manufacturer-multiple-retailer supply chain system. Traditionally, the bargaining power of the single manufacturer is superior to those of retailers. The business environment supported by the e-business scheme may give rise to new business behavior. The multitude of retailer requests the manufacturer to relax the his unilateral lot-sizing policy while they are willing to compensate more than the manufacturer's expected loss caused by abandon his superior bargaining power. The side payment aggregated by the multiple retailers is transferred to the manufacturer according to the degree of the manufacturer's relaxation from the current unilateral lot-sizing policy.
-
In this study, we consider the mechanism or the contract to mitigate inefficiency of individual and partial optimization in decentralized supply chain, which consist of a manufacturer and a retailer and In which the latter can increase demands by practicing her own promotional efforts. In that supply chain, we show to be able to achieve profit level in centralized channel by manufacturer's 'allowance' to retailer.
-
Recently a multi-attribute structure analysis method is one of the evident areas of important points in the decision support system analysis. This research developed an internet/intranet-based solution builder for a three-step decision support system using fuzzy-AHP in the view of 1) brainstorming far the idea generation, 2) fuzzy-AHP (fuzzy analytic hierarchy process) as a multi-attribute structured analysis method and 3) aggregation logic model to integrate the results of individual analysis. We applied this decision support system to the make-or-buy decision problem for school foodservice system considering the multi-attributes in the decision making. A computer program is developed and demonstrated it internet/intranet-based decision problem. It was known that this solution builder provides decision makers a good tool for mate-of-buy group decision making.
-
본 논문에서는 서로 다른 주문들의 일부를 일괄적으로 처리할 수 있을 때, 최대 개수의 작업 단위로 최대한 많은 수의 주문을 처리하는 문제를 다룬다. 무향그래프와 배치 크기
$\lambda$ 로 표현되는 이 문제의 일반적인 경우는 NP-hard이며, 나무일 때 다항시간 안에 최적해를 찾을 수 있음이 증명되어 있다. 본 논문에서는 이분 그래프의 경우에도 NP-hard임을 보이고, 이 경우에 절대근사 알고리즘과 상대근사 알고리즘을 제시한다. -
Unlike the mean-variance approach, the stochastic dominance approach is to form a portfolio that stochastically dominates a predetermined benchmark portfolio such as KOSPI. This study is to search a set of portfolio weights for the first degree stochastic dominance with maximum expected return by managing the constraint set and the objective function separately. An algorithm was developed and tested with promising results against Korean stock market data sets.
-
This research aims to propose model for measuring the efficiency of R&D organizations by using Data Envelopment Analysis. In existing research about using Data Envelopment Analysis, the types of R&D organizations have not been clarified and the difference between analysis time from measurement time is usually
$4{\sim}5$ years. This research divides R&D organizations into three types and provides proper methods for measuring the efficiency of each R&D organizations. -
치열한 유통업체의 경쟁에서 오프라인매장을 가진 업체에서는 제한된 시공간에서 보다 많은 상품을 팔 수 있는 시스템이 필요하다. 본 연구에서는 오프라인매장에서 수익률이 낮은 상품을 제거하고 그 상품을 대체해서 판매할 상품을 선정하는 시스템을 설계하고자 한다. 현재 신제품이 활발하게 출시되고 있고, 전자매장에서 꾸준한 판매량을 보이고 있는 PMP(Portable Multiplayer Player)를 신상품선정시스템에 적용하여 판매상품과 개발상품을 선정하는 과정을 보여준다.
-
본 연구는 최첨단 기술정보를 기반으로 경쟁하는 기업들이 첨단기술정보, 창조정보, 지식정보를 통합한 통합정보를 최적으로 경영하여 이를 연구원에게 제공함으로써 창조성을 극대화할 수 있도록 하기 위한 것이다. 이를 위해 각 기술정보, 창조정보, 지식정보의 기본적인 가치를 측정하는 정적평가와 정보의 공유도산출이라는 동적평가를 동시에 수행하는 평가시스템으로 설계하여 이들 정보의 활용도를 극대화시키는 것이 본 논문의 목적이다.
-
The object of this research is to evaluate the priority of R&B project alternatives which were already screened by both feasibility and suitability of technological performance. This research is a selection model for R&D project alternatives after setting phase. And it is designed by CHP model which include individual and mutual weights. This model have 5 steps. (1) Setting Technology-Modules derived on the setting phase (2) Presenting the evaluation standards divided with 'M-Field' and 'T-Field' (3) Assessing the evaluation standard and technology modules (4) Obtaining and integrating the individually and mutually effective weights (5) Selecting the technology modules based on the priority of order by CHP. Through these steps, this model can suggest the evaluation way from specific technology levels to project level. And it can be guaranteed to perform the selected module set.
-
In this study, we developed a new methodology. That is Cross effects type dicho-hierarchy process(CEDHP) model, which determines priorities of project alternatives through evaluating project alternatives as the dicho-hierarchy composed of the strategy and technology field, and estimating cross effects as the cross-impacts between projects completion times.
-
본 연구에서는 우수 학생을 알아보기 위해 학생들의 학습 성과 및 과외활동을 바탕으로 평가모형을 설계하고 AHP(Analytic Hierarchy Process) 기법을 통해 분석하였다. 대부분의 대학에서 시행되고 있는 장학금 제도는 평가 기준이 해당 학기 평점으로 장학금 혜택을 받는 학생들이 일부 학생으로 제한되는 경우가 생기기도 한다. 실제로 평점뿐 아니라 다른 평가 기준을 가지고 학생들을 평가하여 학생들의 다양한 특성을 키워 줄 필요가 있다 평점만으로 학생을 평가하는 방식이 아닌 다양한 기준의 평가 모형을 가지고 학생들을 평가하는 새로운 방식의 학생평가모델을 제안하고자 한다.
-
본 연구는 차세대 게임기의 하드웨어 성능 및 소프트웨어 측면에서 시장에 판매중인 차세대 게임기의 우수성을 평가하는 방법을 개발하고 실제 적용하는 것이 목적이다. 먼저 하드웨어 측면과 소프트웨어 측면에서의 차세대 게임기를 평가하기 위한 평가요소를 도출하고 이를 AHP(Analytic Hierarchy Process)와 DEA(Data Envelopment Analysis)에 의해 분석모델을 개발하였다. 평가요소로는 비디오, 오디오 및 기타 장치관련 요소들이 도출되었다. 또한, 차세대게임기에 대한 설문조사 및 데이터 조사를 실시하여 심층 분석하였다 이 논문으로 차세대 게임기 구매 시 결정 기준을 만들어 우수한 평가기준을 수립하는 것이 목적이다.
-
The Service sector has increased in importance over the last decade in troops. Military included public sector, but has very different peculiarity from other public institution. So it's necessary that developing an evaluation tool that measuring service quality and customer satisfaction for troops. This study was conducted to identify tile service quality factors which are utilized to measure military vehicle maintenance service quality and customer satisfaction. In this paper, developing a Structural Equation Model at 'three dimensional model of service quality', and it is applied to customers of military vehicle maintenance service.
-
제조산업에 기반을 둔 기업들의 주된 관심사 중에 하나가 바로 비용 절감이다. 비용을 구성하는 요소에는 여러 가지가 있지만 그 중에서도 원자재 구입에 늘어가는 비용은 시장의 상황에 따라 변화하기 때문에 가변적인 요소로써 기업의 실적 및 재무구조에 영향을 주게 되고 이는 해당 기업의 주가에 반영된다. 본 논문에서는 국제 원자재 시장과 주식시장간의 상관관계를 분석하였다. 주식시장에 등록된 기업들을 업종별고 분류하여 각 기업들의 주가 및 업종별 지수와 원자재 가격간의 cross-correlation을 구해보고 원자재 가격이 주식시장에 미치는 영향을 정량적으로 분석하였다. 이러한 연구는 주식시장을 예측하는데 있어서 원자재 시장의 분석이라는 또 하나의 중요한 지침을 마련하고 궁극적으로 불확실한 미래를 대비할 수 있는 Risk management 방안을 마련하는데 도움이 될 것으로 사료된다.
-
In this paper, we developed the fuzzy group method data handling-type (GMDH) Model and applied it to demand forecasting of educational expenses. At present, GMDH family of modeling algorithms discovers the structure of empirical models and it gives only the way to get the most accurate identification and demand forecasts in case of noised and short input sampling. In distinction to fuzzy system, the results are explicit mathematical models, obtained in a relative short time. In this paper, an adaptive learning network is proposed as a kind of fuzzy GMDH. The proposed method can be reinterpreted as a multi-stage fuzzy decision rule which is called as the fuzzy GMDH. The fuzzy GMDH-type networks have several advantages compared with conventional multi-layered GMDH models. Therefore, many types of nonlinear systems can be automatically modeled by using the fuzzy GMDH. A computer program is developed and successful applications are shown in the field of demand forecasting problem of educational expenses with the number of factors considered.
-
In most countries, mobile subscribers are already experiencing 3G-like services. At the moment of launching 3G services, lots of studies showed estimates of the number of subscribers for 3G services, using long-term demand curves, econometric methods or survey methodologies. Those studies mainly focused on the potential number of subscribers and the point of rapid growth rather than precise estimates for the services. Even though we've already experienced parts of 3G services, full length of 3G services are expecting in near future. Therefore, now we need to have more accurate estimates for 3G services. While we thought that 3G services were moved from 2G, in real place 3G services are being evolved from 2G services. In the process of evolving, regulators' policy affects service demand and diffusion significantly. For the more accurate estimates, we need to consider policy issues which influence service diffusion practically in real place. This study aims to present a model which shows better estimates for 3G services with consideration on policy issues, such as numbering issues, price regulation, and competition policy. The consideration can provide more accurate estimates for 3G services with service providers. The methodology could help academicians In forecasting of similar telecommunications services as well.
-
In this paper, an analytic model of sleep model operation in the IEEE 802.16e is investigated. A mobile subscribe. station (MSS) goes to sleep mode after negotiations with the base station (BS) and wakes up periodically for a short interval to check whether there is downlink traffic to it. If the arrival of traffic is notified, an MSS returns to wake mode. Otherwise, it again enters increased sleep interval which is double as the previous one. In order to consider the situation more practically, we propose the sleep mode starting threshold, during which MSS should await packets before it enters the sleep mode. By modifying the M/G/1 with multiple vacations model, energy consumption ratio(ECR) and average packet response time are calculated. Our analytic model provides potential guidance in determining the optimal parameters values such as sleep mode starting threshold, minimal sleep and maximal sleep window.
-
보험요율 및 정책 결정의 기본이 되는 파산 확률은 계산이 매우 복잡하여 보통 근사적인 방법을 사용하게 된다. 윤복식(2007)에서는 다양한 상황에서 정확하게 파산확률을 계산할 수 있는 방법이 GPH 분포에 기초하여 제안된 바 있다. 본 연구에서는 이 방법의 타당성을 다양한 실험을 통해 검증하고. 기존의 근사적 방법들과의 비교하는 것이 목적이다. 실험을 통해 이 방법이 일상적인 상황에서 뿐 아니라 클레임 분포가 비정규적인 대재해 상황에서도 정확하게 파산확률을 계산해 주는 것을 관찰할 수 있었고, 계산시간 또한 도 매우 짧아서 실용성을 겸비함을 확인할 수 있었다 또한 이 결과를 근거로, 기초적인 관측 자료만 입력하면 중간에 분포모델 설정단계를 거치지 않고 바로 분석 결과를 얻는 접근법이 제안된다.
-
B2C, B2B와 같은 인터넷 상거래뿐만 아니라, 전자정부를 통한 G2C 등에서 보는 바와 같이, 공공 및 민간 IX(Internet exchange)를 통한 인터넷 상호연동 인프라는 명실상부한 사회 신경망으로 기능한다. 따라서 전통적인 사회간접자본인 도로, 항만, 전력 등에서와 마찬가지로, 그 구축 및 운영에서의 안정성과 신뢰성에 대한 요구가 점차 강화되고 있다 본 연구는 인터넷 상호연동망의 안정성과 신뢰성을 제고하기 위한 방안을 위험관리 관점에서 제안한다. 먼저, 인터넷 상호연동의 강건성(robustness)을 높이기 위한 방어기제와 더불어 상호연동 대안들을 개발한다. 이들 대안은 장애시에 작동하는 별도의 상호연동 비상망을 운영하는 방재형과, 지역적으로 분산된 상호연동 허브(IX)를 운영하여 장애에 따른 피해 확산을 방지하는 분산 허브형으로 구분된다. 본 논문에서는 또한 대안들의 위험효율성(risk efficiency)을 체계적으로 비교/평가하기 위하여 경영공학 방법론에 의한 위험평가 프레임워크를 개발하고, 이를 투자수준이 상이한 여러 대안들에 적용한다. 몬테카를로 시뮬레이션을 통한 ROI(Risk On Investment) 분석 결과, 방재형 대안이 비용 대비 위험효율성 측면에서 최선의 후보로 평가되었다.
-
본 연구에서는 상거래 분야에서의 RFID를 이용한 비즈니스 모델과 함께 사업 참여자의 서비스 도입 가치를 탐색하였다. 제안하는 세 가지 비즈니스 모델은 RFID 서비스 인프라 환경을 고려하여 설계하였으며, 상거래 사업자에게는 기존에 수행하던 상거래 서비스의 효율화와 상거래 기능이 없었던 공간에서의 상거래 기능 부여, 모든 생활 공간의 상거래 가능 공간으로의 변화라는 가치를 제공한다.
-
모바일 RFID 는 ‘모바일’과 'RFID’ 특징의 결합이라는 강력한 장점을 가지고 있어서 사용자 정보에 대한 파악과 사용자의 위치 및 상황에 따른 광고에 다양하게 활용될 수 있다. 이에 본 연구에는 태그 매치 광고를 중심으로 한 모바일 RFID 광고 비즈니스 모델을 설계한다. 이를 위해 모바일 RFID 서비스의 특징 및 서비스 유형을 분류하는 것에서부터 연구를 시작하여, 모바일 RFID 광고의 정의 및 유형을 분류한다. 이후 모바일 RFID를 활용한 태그 매치 광고를 중심으로 시나리오를 제시하고, 비즈니스 모델의 프로세스 분석 및 각 사업 참여자들의 역할 및 제공가치와 인센티브를 고찰한다. 본 비즈니스 모델의 타당성을 논증하기 위해 태그 매치 광고와 유사성이 있는 온라인 광고 모델 및 모바일 광고에 대하여 검토한다.
-
Activating e-commerce, studies about trust of business acquaintance are actively made. This study measured the effect of trust transfer setting up 6 situations according to linking direction, design standard and grasping their trust changes for surveying trust transfer on online. The result is that trust transfer becomes different in accordance with the linking direction of hyperlink. In other words, setting up target site as comparative subject, it is more reliable than single site. Setting up source site as comparative subject, trust changes are slight. This study is composed of 6 good site and 6 poor site. And trust transfer by hyperlink on online is consistent, especially trust transfer is affected by not source site but target site. If target site is poorer than source site, trust transfer originate definitely. So we can draw consistent conclusion that it rate higher than single site. On the other hands, if targer site is better than source site, trust transfer occurs not inter-website. Instead, affected by human mentality, it rates good site higher by conformity reversion.
-
오늘날 세계화된 시장 환경은 기업간 협업 프로세스의 동적 구성을 요구하고 있으며, 웹 서비스 (Web services)와 비즈니스 프로세스 관리 (Business Process Management) 기술의 발전이 이의 구현을 뒷받침하고 있다. 임의의 기업과의 느슨한 구성(loosely-coupled)을 통한 동적 협업이 활성화됨에 따라, 프로세스의 서비스 품질 (Quality of Service)이 중요한 문제로 대두되고 있는데, 특히 단순한 단위 웹 서비스가 아닌 장기 실행 액티비티 (Long-termed activity)를 포함하는 협업 프로세스에서는 제한된 시간 내에 프로세스의 정상적 수행을 보장하는 것이 핵심적 요구사항이라 할 수 있다. 본 연구에서는 프로세스 수행 계획을 동적으로 생성, 관리함으로써 프로세스의 각 인스턴스들의 완료와 납기 준수를 보장할 수 있는 방법론을 제시한다. 본 방법론은 프로세스 인스턴스의 진행과정에 따라 중복(redundancy) 계획을 동적으로 수정함으로써 각 액티비티의 수행 시간과 신뢰성(reliability)을 독립적으로 관리한다. 본 방법론의 최적화 모델은 NP-hard로 증명되었으며, 본 연구에서는 최적화 모델을 위한 휴리스틱 알고리즘을 제시하고, 이를 실제 최적해와 비교하는 실험을 행하였다. 본 연구를 통해 보다 복잡한 기업간 협업환경에서의 수행 보장과 장애내감성 실현이 가능해 질 것으로 기대된다.
-
Corporate managers look at IT outsourcing as long-term strategic choices not as short-term tactical ones, and maximizing the effect that IT outsourcing brings about is the main concern to them. Emerging different types of IT outsourcing and their effects on the corporate business decisions necessitate the research on this subject. According to previous researches, the Intent for IT outsourcing is categorized as IS Improvement, Business Impact, and Commercial Exploitation. The decison factors for these IT outsourcing include corporate strategy types, IT role, and interaction between these two. Firm size and IT maturity are selected as moderating factors to add the credibility to the research of the effect of IT outsourcing decision making. Analyzing IT outsourcing data collected from 61 large-size and mid-size domestic firms revealed that corporate strategy rather than IT role is more significant factor affecting the intent for IT outsourcing decision. That means the decision of outsourcing intent is affected by corporate strategy types. Defenders(as in corporate strategy types) tend to use IT outsourcing more as a means to improve information systems, compared to analyzers and reactors. Prospectors tend to use IT outsourcing more as a commercial exploitation, compared to analyzers and reactors. These outcomes prove that corporate strategy characteristics reflect outsourcing intent. There were previous researches that showed outsourcing decision depends on IT role however the hypothesis was rejected that IT role determines outsourcing intent. It was also rejected that the interaction between corporate strategy types and IT role determines outsourcing intent. Corporate decision makers should first analyze corporate strategy, and reflect it on the outsourcing intent when they make IT outsourcing decisions. Only the precise defining of IT outsourcing intent will lower the risk and increase the possibility of success.
-
BPMS는 애플리케이션으로부터 프로세스 논리를 분리한다는 혁신적인 사상으로 시작했지만, 이를 어떻게 이룰 것인지에 명확하지가 않다. 여기서는 EDA(Event Driven Architecture)를 프로세스 논리의 분리 기준으로 제시한다.
-
One of the roles of the Semantic Web services is to execute dynamic intra-organizational services including the integration and interoperation of business processes. Since different organizations design their processes differently, the retrieval of similar semantic business processes is necessary in order to support inter-organizational collaborations. Most approaches for finding services that have certain features and support certain business processes have relied on some type of logical reasoning and exact matching. This paper presents our approach of using imprecise matching fur expanding results from an exact matching engine to query the OWL MIT Process Handbook. In order to use the MIT Process Handbook for process retrieval experiments, we had to export it into an OWL-based format. We model the Process Handbook meta-model in OWL and export the processes in the Handbook as instances of the meta-model. Next, we need to find a sizable number of queries and their corresponding correct answers in the Process Handbook. We devise diverse similarity algorithms based on values of process attributes and structures of business processes. We perform retrieval experiments to compare the performance of the devised similarity algorithms.
-
The mobile Internet (M-Internet) service is a form of subscription-based information Systems (IS) services in which usage continuance is essential for the eventual success of the service providers. However, previous research on IS continuance has focused mainly on the technology user aspects despite the fact that the user plays a dual role of being a technology user and service consumer in many IS usage contexts. This study thus aims to examine IS continuance based on the theoretical foundation of dedication-based and constraint-based customer relationship development in the context of M-Internet service. Four customer relationship development factors (satisfaction, perceived value, familiarity, and switching costs) are identified and tested on how they affect continuance intention from a survey conducted on M-Internet service users. Then, the results of this study are discussed along with its limitations and implications.
-
본 논문은 데이터 마이닝의 기법 중 가장 잘 알려진 지도학습 기법의 성능 향상을 위한 새로운 Hybrid 및 Combined 기법인 불일치 패턴 모델(오차 패턴 모델)에 대한 연구 논문이다. 불일치 패턴 모델이란 2개 이상의 기법 중 향후 더 레코드별로 더 잘 맞출 수 있는 기법을 메타 분류하는 불일치 패턴 모델을 개발하여, 최종적으로는 기존의 기법보다 더 좋은 분류 정확도 및 예측 향상율을 기대하기 위한 기법을 의미한다. 본 논문에서는 의사 결정나무 추론 기법인 C5.0과 C&RT 그리고 신경망 분석, 그리고 로지스틱 회귀분석과 같은 대표적인 데이터 마이닝의 지도학습 기법을 이용하여 불일치 패턴 모델을 생성하여 보고, 이들이 기존 단일 기법과 기존의 Combined 모델인 Bagging, Boosting 그리고 Stacking 기법보다 성능이 우수함을 23개의 실제 데이터 및 공신력 있는 공개 데이터를 이용하여 증명하여 보였다. 또한 데이터의 특성에 따라서 불일치 패턴 모델의 성능의 변화 및 더 우수해 지는지를 알아보기 위한 연구포 같이 수행을 하여 본 모델의 활용성을 높이고자 하였다.
-
We consider a proportionate flow shop problem with controllable processing times. The objective is to minimize the sum of total completion time and total compression cost, in which the cost function of compressing the processing times is non-decreasing concave. We show that the problem can be solved in polynomial time by reducing it to a polynomially solvable 0-1 unconstrained quadratic program.
-
본 논문에서는 서로 다른 주문들의 일부를 일괄적으로 처리할 수 있을 때, 최소 개수의 작업 단위로 모든 주문을 처리하는 문제를 다룬다. 무향그래프와 배치 크기
$\lambda$ 로 표현되는 이 문제의 일반적인 경우는 NP-hard이며, 그래프가 나무와 interval 그래프 일 때 다항 시간 안에 최적해를 찾을 수 있음이 증명되어 있다. 본 논문에서는 LP 완화 기법을 이용한 근사알고리즘과 LP 완화를 통한 최적해의 분석을 제시한다. -
The hierarchical covering location problem emphasizes the issue of locating of hierarchical facilities in order to maximize the number of customers that can be covered. In the classical HCLP(Hierarchical Covering Location Problem), it is assumed that the customers are covered completely if they are located within a specific distance from the facility, and not covered otherwise. The generalized HCLP is introduced that the coverage of customers is measured to be any real value rather than 0 or 1, where the service level may decrease according to the distance. Mixed integer programming formulation for the generalized HCLP is suggested with a partial coverage of service. Solutions are found using OPL Studio, and are evaluated for various cases.
-
The mobile and multimedia service on wireless network have been leaded from the improvement of telecommunication techniques. A typical multimedia service, a video transmission usually requires larger bandwidth than voice transmission. Many channel allocation algorithms for Orthogonal Frequency Division Multiple Access (OFBMA) to use resources more efficiently, Previous channel allocation algorithms have developed with an assumption that the data traffic is constant bit rate (CBR). However, existing algorithms are not suitable to video traffic because it usually generates a variable bit rate (VBR) traffic. In this paper, we proposed a new channel allocation algorithm called a queue-based channel allocation. it is more suitable to transmit the video traffics. Also, a problem are notified in case of realtime generated video traffic and a corresponding heuristic solution was proposed.
-
IEEE 802.11 wireless LANs employ the backoff algorithm to avoid contentions among STAs when two or more STAs attempt to transmit their data frames simultaneously. The MAC efficiency can be improved if the CW values are adaptively changed according to the channel state of IEEE 802.11 wireless LANs. In this paper, we propose a dynamic contention window control algorithm using the genetic algorithm to improve the MAC throughput of IEEE 802.11 wireless LANs.
-
본 연구는 우리나라 이동전화고객의 서비스 전환(번호이동)에 영향을 미치는 요인에 대한 실증 분석을 다루고 있다. 실증 분석을 위해서 본 연구에서는 이동전화 번호이동제가 도입된 2004년 1사분기부터 2007년 2사분기까지 총 14개 분기의 시계열 자료를 활용하였다. 종속변수로는 이동통신 3사의 분기별 번호이동자수를 이용하였으며 설명변수로는 이동통신사의 가입자 유치비용 및 전환비용과 더불어 수요특성을 감안한 대기수요효과, 추세효과, 구조변화효과 등을 고려하였다 분석 결과 각 사업자별 번호이동 유입자수에 영향을 미치는 요인이 상이함을 확인할 수 있었다 구체적으로 SKT로 이동해오는 고객 수는 SKT의 가입자 유치비용, KTF에서 오는 대기수요 등이 유의한 영향을 미치는 것으로 나타났으며, KTF로 이동해오는 고객 수는 번호이동고객이 느끼는 전환비용, SKT로부터의 대기수요 등의 영향을 받는 것으로 나타났다. LGT에는 LGT의 유치비용과 추세의 영향을 크게 받는 것으로 나타났다.
-
In this paper, we proposed the next generation mobile convergence service business model creation methodology. In order to establish such a business model creation methodology framework, we first introduce the service model based on our previous research results on next generation mobile convergence services. The service model contains several components such as infrastructures, operations, and provision of services that are indispensible for providing the next generation mobile services. Finally, by adding service and value flows to the developed service model, we propose the next generation mobile services business model creation methodology. To achieve this objective, we first derive necessary components of business model including actors, their relationships, and roles. In addition, we propose service composition methodology for creating new mobile services and its corresponding business models.
-
Mobile ad hoc network(MANET) is a kind of wireless network which has no infrastructure. Each component node of MANET can move freely and communicate based on wireless peer to peer mode. Because of its vulnerable routing protocols, MANET is exposed to many kinds of attacks. A sinkhole attack is one of the representative attacks in MANET caused by attempts to draw all network traffic to a sinkhole node. This paper focuses on the sinkhole problem on Dynamic Source Routing(DSR) protocol in MANET. To detect the sinkhole node, we extract several useful sinkhole indicators through analyzing the sinkhole problem, then propose an efficient detection method based on an incremental learning algorithm. The simulation results show that the proposed method is effective and reliable for detecting sinkhole intrusion.
-
Traditional clustering is regarded as an unsupervised teaming to analyze unlabeled data. Semi-supervised clustering uses a small amount of labeled data to predict labels of unlabeled data as well as to improve clustering performance. Previous methods use constraints generated from available labeled data in clustering process. We propose a new constraint-based semi-supervised clustering method by reflecting initial predicted labels of unlabeled data. We evaluate and compare the performance of the proposed method in terms of classification errors through numerical experiments with blinded labeled data.
-
In wireless network, we propose a predictive location update scheme which considers mobile user's(MU's) mobility patterns. MU's mobility patterns can be found from a movement history data. The prediction accuracy and model complexity depend on the degree of application of history data. The more data we use, the more accurate the prediction is. As a result, the location management cost is reduced, but complexity of the model increases. In this paper, we classify MU's mobility patterns into four types. For each type, we find the respective optimal number of application of history data, and predictive location area by using the simulation. The optimal numbers of four types are shown to be different. When we use more than three application of history data, the simulation time and data storage are shown to increase very steeply.
-
본 연구는 에이전트 기반 모의(ABMS:Agent Based Modeling and Simulation)을 이용하여 미래 주변국과의 불확실한 분쟁상황을 모의하고, 상황의 이해(Understandering)와 결과를 예측하여 주변국에 대한 방위충분성(Defense Sufficiency)이 고려된 기동전단의 전력수준을 판단하고 발전방향을 제시하는데 있다. 모의에 앞서 기존문헌과 관련자료, 연구사례를 통하여 ABMS의 이해를 증진하였으며, 방위충분성의 개념을 통하여 연구의 당위성을 제고하였고, 한국과 주변국의 해군력 현황을 살펴 보았다. 그리고 한국 기동전대와 주변국 전력의 분쟁상황을 ABS 모델 MANA(Map Aware Non-uniform Automata)로 모의하였다. 연구결과로 방위충분성 기동전단의 전력수준은 최소한 광개토-III급 4척과 충무공이순신급
$16p{\sim}20$ 척으로 구성된$20{\sim}24$ 척으로 되어야 한다. 한국해군의 발전방향은 현재의 전력증강 계획과 더불어 광개토-III급 1척을 추가 계획하여야 하며 차기 호위함의 전력을$10{\sim}14$ 척 규모로 추진해야할 것이다. 또한 차기호위함의 전투체계 능력은 충무공이순신급 이상의 수준으로 개발하여 기동전단 전력으로 활용하는 것이 타당할 것이다. -
This paper presents, with some actual cases of employing clear case, as a R&D project configuration management tool, a new methodology for the evaluation and enhancement of project performance in R&D organization. This methodology enables you to forecast future results of the project with story telling skill, to innovate R&D project execution using the concept of Technology Supply Chain with global R&D human resources, to improve the performance of each development stage based on the voices of customer, and to enhance the quality of output and to minimize risk of project with timely positioning of R&D human resources.
-
본 논문에서는 응용서비스 제공자가 망사업자의 망을 이용하여 응용서비스를 제공하고 망사업자에게 사용대가를 지불하는 경우를 다루었다. 우리는 Stackelberg 게임을 이용하여 두 사업자간의 계약(contract)설계 문제를 정형화하였고 이 게임의 균형점 (equilbrium)이 유일하다는 것을 보였고 또 이 균형점이 망사업자의 위험선호도에 따라서 어떻게 바뀌는지를 고찰하였다.
-
For Shock obsorber piston led is launched to the market through luring, milling, grooving, rolling, inspection and finally packing processes, To this time around 11 items, that is, out diameter and length etc..for the piston lod are inspected strictly as a total inspection. Piston Lod is being produced 30,000 a day and its excessively repeating inspection is getting induce repetition strain injury and reduce production rate as fatigue accumulation of worker increase inspection errors. Therefore, for the inspection process is severely needed a progressive improvement through the automation. In this study, we consider automation method of piston led inspection process and suggest an efficient automation strategy as improving the various problems in present manual inspection way.
-
The sponsored search has become significant channel of online advertising, and the large sized advertisers have appeared, so the sponsored search strategy is becoming more important. Since CPC(Cost-per-Click) advertising has different price according to keyword, it is difficult to manage the a lot of keywords at one time. So, the purpose of this study is to investigate the factors which influence on the cost-per-click of sponsored search advertising. That is, there are four factors: impression, CTR(Click through Rate), conversion rate, and keyword's length. for the regression analysis, we use the actual data which is gotten from an ad agency. The result of that, the impression and keyword's length influence cost-per-click positively. However, CTR & conversion rate have no influence on it unexpectedly.
-
본 연구는 개인의 모바일 RFID를 활용하여 다양한 컨텐트를 습득하고 이를 개인 미디어를 동해 관리하는 과정 속에서 발생할 수 있는 U-커뮤니티 비즈니즈 모델을 설계한다. 유비쿼터스환경에서는 개인이 습득하게 되는 다양한 컨텐트와 온라인 상의 정보 사이에 연결완전성 (Seamlessness) 이 담보되고, 그 저장 및 게시가 손쉽게 이루어질 수 있을 것이라 판단하고, 유 비쿼터스 환경에서 나타날 수 있는 U-Community 비즈니스 모델의 시나리오를 제시한다. 시나리오 분석을 통해 각 사업 참여자들의 역할과 잠재적 이익을 검토하고, 각 사업 참여자가 본 비즈니스 모델을 수행하기 위한 조건에 대하여 검토한다.
-
사진은 시각화되어 있으면서도 사용자가 생성하기 쉽다는 이유로 가장 인기 있는 컨텐트 중 하나이며, 사진을 찍은 위치 정보는 해당 장소가 갖는 특징 혹은 상징성으로, 상품 및 서비스와 연관성을 갖고 있기 때문에 상거래의 매개체가 될 가능성을 내포하고 있다. 그러나 현재의 상거래 환경에서는 사진의 위치정보를 자동화, 체계화하여 저장하고 활용하는데 한계를 가지고 있어서 사진 자체가 상거래에 활용되는 모델을 찾아보기 힘들다. 본 연구에서 제시하는 U-Photo 비즈니스 모델은 사용자가 찍은 사진의 배경에 해당하는 장소를 그 장소를 통해 광고를 하고자 하는 광고주와 연계하고, 그 사진을 클릭했을 때 광고주의 사이트가 로딩 되도록 하는, 컨텐트 생성자, 컨텐트 소비자, 광고주 연계 비즈니스 모델이다. 본 논문은 유비쿼터스 컴퓨팅 환경에서 사진을 활용한 비즈니스 모델을 제안하고, 본 비즈니스 모델이 어떤 함의를 지니고 있는지를 분석하며 시장에서 실제 작동할 조건을 예측하여 본 비즈니스 모델을 평가한다.
-
This study suggests how to evaluate the business model feasibility of Geographic Information Service(GIS) before they are commercialized in Ubiquitous Environments. It suggests the evaluation framework for business feasibility in order to provide a successful method. The framework is consisted of various evaluation dimensions and Indices like technology, marketability, business ability, customer satisfaction and business risk. From this research, we will anticipate a high rate of successful GIS business in respect to various elements related in the commercialization of the former business in ubiquitous environments.
-
Mashups are new type of interactive web applications, combining content from multiple services or sources at run time. The www is currently experiencing a revolutionary growth due to its increasing participative community software applications. One of the interesting aspects of the Web 2.0 evolution is the wide-availability of various Web applications as APIs or Web services. These APIs expose informational services on the Web and take many forms of remote invocation of functions using standard Web protocols and XML for data representations. The paper describes mashups from a number of angles, highlighting current developments while providing sufficient illustrations to indicate its potential implications.
-
Overlay multicast is an emerging technology for next generation Internet service to various groups of multicast members. It will take the place of traditional IP multicast which is not widely deployed due to the complex nature of its technology. The overlay multicast which effectively reduces processing at IP routers can be easily deployed on top of a densely connected IP network. An end-to-end delay problem is considered which is serious in the multicast service. To periodically optimize the route in the overlay network and to minimize the maximum end-to-end delay, overlay multicast tree is investigated with genetic Algorithm. Outstanding experimental results are obtained which is comparable to the optimal solution and the tabu search.
-
In cognitive radio systems, secondary users, unlicensed users, can use primary users' spectrum to increase spectrum efficiency. At that time, the systems must satisfy primary users' QoS. When secondary users use cognitive radio systems, secondary users communication can be terminated, because of satisfying primary users' QoS. However, secondary users' communication terminating is not good for both secondary users and whole systems. So, cognitive radio systems need an efficient algorithm for secondary users of admission control and keeping connections. In this paper, we present an algorithm which consist of two part, admission control and connections control.
-
For the quantitative analysis of inclusion using OES data, separating of noise and inclusion is needed. In previous methods assuming that noises come from a normal distribution, intensity levels beyond a specific threshold are determined as inclusions. However, it is not possible to classify inclusions in low intensity region using this method, even though every inclusion is an element of some chemical compound. In this paper, we assume that distribution of OES data is a Gaussian mixture and estimate the parameters of the mixture model using EM algorithm. Then, we calculate mixing ratio of noise and inclusion using these parameters to separate noise and inclusion.
-
The purpose of this study is to provide the ideal forecasting model of cadastral survey work load through the Economeatric Analysis of Time Series, Granger Causality and VAR Model Analysis, it suggested the forecasting reference materials for the total amount of cadastral survey general work load. The main result is that the derive of the environment variables which affect cadastral survey general work load and the outcome of VAR(vector auto regression) analysis materials(impulse response function and forecast error variance decomposition analysis materials), which explain the change of general work load depending on altering the environment variables. And also, For confirming the stability of time series data, we took a unit root test, ADF(Augmented Dickey-Fuller) analysis and the time series model analysis derives the best cadastral forecasting model regarding on general cadastral survey work load. And also, it showed up the various standards that are applied the statistical method of econometric analysis so it enhanced the prior aggregate system of cadastral survey work load forecasting.
-
As the importance of logistics is increasing, Enterprises design the supply chain(SC) network to minimize the total costs considering inventory holding cost, transportation cost and apply the efficient strategies of supply chain based on SC network Calculating the logistics costs without reflecting the logistics components like the packaging cost, transportation related cost, storage cost, loading & unloading cost, and distribution costs, the companies should have many limitation to calculate the logistics cost of real enterprise and install the SC network reducing them. Therefore, this research is aimed at establishing SC strategies which can be an efficient alternative for a decision making on supply chain, based on existing reference and current logistics networks of 'L' company in Korea and analyzing interaction effects between strategies and influence on logistics cost by these strategies. As the method of analysis, we analyze the interaction effects between strategies as well as install the optimal SC network reflecting concrete logistics components from the viewpoint of total logistics costs. we expect that analysis method of this paper would be applied various industries and used the efficient tools for the decision mating by planing and execution of the logistics budget from enterprises.
-
In this study, we investigated how to distinguish customer delivered value to re-purchasing in fierce B2C industry. To identify key managerial variables that could distinctively impact re-purchasing, we first identified customer value proposition as per the customer buying decision process. Next, core value propositions of choice efficiency and competitive price are defined to determine vendor satisfaction during the searching stage and purchasing stage. The trust level is also introduced in the sense of reflecting confirmation to guarantee after purchase security. Then, significant managerial variables to impact on core value propositions are extracted. The resulting structural model illustrated that search convenience and quality assurance affect the choice efficiency, and re-purchase intention is strongly explained by both the vendor satisfaction and trust level. The empirical testing results also support that transaction cost reduction is key determinant of shopping at the Internet shopping mall. Furthermore, trust level should be combined to induce re-purchasing in addition to transaction cost savings.