• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제13권1호
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• pp.46-58
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• 2007

최근 많은 소프트웨어 개발 프로젝트들은 지속적으로 요구사항들이 변경되는 대규모의 복잡한 시스템이며 컴포넌트 기반이나 제품계열 소프트웨어 개발 방식과 같이 아키텍처 기반으로 소프트웨어를 개발하고 있다. 이러한 소프트웨어 개발환경에서 생산성이나 유지보수 향상을 위해서는 무엇보다도 유연하고 확장 가능한 아키텍처가 필요하다. 본 논문에서는 CBD(Component Base Development) 기반의 비즈니스 어플리케이션 개발 및 유지보수 시 생산성과 유지보수 향상을 위해 필요한 유연성과 확장성 품질속성을 가진 소프트웨어 아키텍처를 제시하고 이들 품질속성을 달성하기 위한 방법들을 아키텍처 모델을 통해 설명한다. 또한, 본 논문에서는 최근 프리젠테이션(Presentation) 프레임워크(Framework)로 잘 알려진 Struts와 JBean이라 불리는 본 논문에서 제안한 프레임워크의 성능을 비교했다. JBean 프레임워크는 프리젠테이션 프레임워크와 비즈니스 로직 프레임워크를 가지고 있기 때문에 공정한 실험을 위해 JBean에서 비즈니스 로직 프레임워크에 관련된 모듈을 제거하고 단지 프리젠테이션단 프레임워크만 가지고 실험을 한 결과 JBean의 프리젠테이션 단 프레임워크가 평균 초당 18개의 거래를 더 처리하고 있다.

• 한국IT서비스학회지
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• 제5권3호
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• pp.165-172
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• 2006

In this paper, we designed a new type of X-internet framework by using Flash component and server service API and analyzed its performance. Proposed X-internet framework uses Flash MX Professional 2004, Java, and software which opened middleware and database. Since proposed framework use the server service API that we developed in this paper and Flash player, this framework does not need server module. Proposed framework enables to obtain design with dynamic user interface compare to Web application and enables to reduce development time. In analytical results, it has been shown that proposed x-internet framework have efficient characteristics such as network traffic, low development cost and dynamic user interface implementation. Since proposed X-internet framework can operate in environment of current developer friendly, it is useful for development of various new application programs and we confirm it through Flash web mail implementation by using proposed x-internet framework.

• 품질경영학회지
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• 제36권2호
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• pp.85-95
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• 2008

This research addresses examining the service recovery process in Airline service. A service recovery framework is suggested and tested empirically. The framework includes several factors such as service recovery expectations, service recovery achievements, recovery performance, post-recovery satisfaction, and post-recovery behavioral intents. The relationships among these factors are hypothesized and proved empirically. Consequently the results suggest that recovery expectation impacts on recovery performance significantly. Also the higher the recovery performance, the higher post-recovery satisfaction, then it increases customers' purchase intent and words of mouth. Finally, this paper suggests the need for new service recovery strategies.

• Nuclear Engineering and Technology
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• 제37권3호
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• pp.221-230
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• 2005

This paper reviews the pivotal phases of the evolution of the current technology-dependent nuclear power safety regulation in the United States. Understanding of this evolution is essential to the development of any future regulatory paradigm, including the technology-neutral regulatory approach that the U.S. Nuclear Regulatory Commission (NRC) has recently embarked on to develop. The paper proposes and examines the implications of a predominately rationalist and best-estimate probabilistic regulatory framework called safety goals-driven performance-based regulation. This framework relies on continuous assessment of performance of a set of time-dependent safety-critical systems, structures and components that assure attainment of a broad set of technology-neutral protective, mitigative, and preventive goals. Finally, the paper discusses the steps needed to develop a corresponding technology-neutral regulatory system from the proposed framework.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.1058-1063
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• 2005

More and more organizations in construction industry adopt knowledge management system (KMS) to facilitate process of creating, acquiring, capturing, sharing, and using knowledge so as to improve the competitiveness, productivity and efficiency of their organization. In spite of the tremendous efforts devoted to KMS, the return of investment on KMS is usually a black box to the investor due to the lack of a systematic framework for performance evaluation of the KMS. This paper aims at fulfilling such need. A conceptual performance evaluation framework is proposed based on Balanced Scorecard (BSC) method. Then a preliminary case study is conducted to assess the applicability of the proposed framework in an A/E consulting firm to evaluate the performance of KMS.

• 한국컴퓨터정보학회논문지
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• 제25권9호
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• pp.91-100
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• 2020

본 논문은 네트워크 품질에 대한 서비스의 품질과 성능을 평가할 수 있는 분산형/탈중앙 스토리지에 오디오와 비디오를 포함하는 멀티미디어 스트리밍 서비스의 프로토타입을 설계하고 구현한 통합된 평가 프레임워크를 제안한다. 본 논문의 평가 프레임워크는 기존 클라이언트·서버 구조의 확장성과 단일 장애 지점의 문제를 극복할 수 있도록 멀티미디어 스트리밍 서비스에 분산형 스토리지를 적용하였으며, 서비스 품질을 측정하고 향상 시키는 중요한 지표에 초점을 맞추었다. 특히 탈중앙 스토리지 기반의 멀티미디어 콘텐츠 스트리밍 서비스에서 스트리밍의 품질과 성능을 평가하기 위한 성능 지표를 측정할 수 있을 뿐만 아니라 네트워크 가상화 기술을 이용하여 네트워크 품질을 조정할 수 있다. 실험 결과에 따르면 제안된 프레임워크는 단일 호스트 컴퓨터에 탈중앙 스토리지 기반 스트리밍 서비스를 구축하고 운영하는 데 있어 오버헤드가 낮음을 보여주었으며, 평가 가능한 시스템 규모의 확장성을 검증하였다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.590-598
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• 2022

Benchmarking is an important tool to assess the performance of capital projects in the construction industry. Incorporating cost-related metrics into a benchmarking system requires an effective cost normalization process to enable meaningful comparisons among projects that were executed at different locations and times. Projects in the downstream and chemicals sector have unique characteristics compared to other types of construction projects, they require a distinctive cost normalization framework to be developed to benchmark their absolute cost performance. The purpose of this study is to develop such a framework to be used for the case of benchmarking the downstream and chemical projects for their performance assessment. The research team started with a review of existing cost normalization methodologies adopted in benchmarking systems and conducted 7 interviews to identify the current cost normalization practices used by industrial professionals. A panel of 12 experts was then convened and it held 6 review sessions to accomplish the framework development. The cost normalization framework for benchmarking downstream and chemical projects was established as a three-step procedure and it adopts a 4-element cost breakdown structure to accommodate projects submitted by both owners and contractors. It also incorporated 5 published cost indexes that are compatible with downstream and chemical projects and they were embedded into 2 options to complete the normalization process. The framework was then pilot-tested on 4 completed projects to validate its functional practicality and the downstream and chemical use case in the benchmarking system.

• International Journal of Computer Science & Network Security
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• 제24권2호
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• pp.67-78
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• 2024

Software-Defined Networking (SDN) is a new emerging networking paradigm that has adopted a logically centralized architecture to increase overall network performance agility and programmability. Combining network virtualization with SDN will guarantees for combined advantages of improved flexibility and network performance. Combining SDN with hypervisors divides the network physical resources into several logical transparent and isolated virtual SDN network (vSDN), where each has its virtual controller. However, SDN hypervisors bring several advantages as well as several challenges to its network operators as for the virtual appliances, their efficient placement, assurance of network performance is mandatory, and their dynamic instantiation with their migration. In this article, we provide a brief and concise review of network virtualization along with its implementation in the SDN network. SDN hypervisors types are discussed, and taxonomy is provided to demonstrate the importance of hypervisors in SDN. A comparison of SDN hypervisors is performed to elaborate on the vital hypervisor software along with their features, and different challenges are discussed faced by the SDN network. A framework is proposed to add combined functionalities of hypervisors to create a more effective and efficient virtual system. The purpose of the framework is to increase network performance through proper configuration of resources, software, control plane isolation functions with defined rules and policies.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권8호
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• pp.3865-3883
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• 2016

Infrastructure as a Service (IaaS) encapsulates computer hardware into a large amount of virtual and manageable instances mainly in the form of virtual machine (VM), and provides rental service for users. Currently, VM anomaly incidents occasionally occur, which leads to performance issues and even downtime. This paper aims at detecting anomalous VMs based on performance metrics data of VMs. Due to the dynamic nature and increasing scale of IaaS, detecting anomalous VMs from voluminous correlated and non-Gaussian monitored performance data is a challenging task. This paper designs an anomaly detection framework to solve this challenge. First, it collects 53 performance metrics to reflect the running state of each VM. The collected performance metrics are testified not to follow the Gaussian distribution. Then, it employs independent components analysis (ICA) instead of principal component analysis (PCA) to extract independent components from collected non-Gaussian performance metric data. For anomaly detection, it employs multi-class Bayesian classification to determine the current state of each VM. To evaluate the performance of the designed detection framework, four types of anomalies are separately or jointly injected into randomly selected VMs in a campus-wide testbed. The experimental results show that ICA-based detection mechanism outperforms PCA-based and LDA-based detection mechanisms in terms of sensitivity and specificity.

• 한국정보시스템학회지:정보시스템연구
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• 제23권4호
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• pp.75-91
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• 2014

The effective supply chain management(SCM) is a matter of survival in many firms because successful supply chains will effectively coordinate their processes, focus on delivering customer value, eliminate unnecessary costs in key functional areas, and create performance measurement systems. The balanced scorecard(BSC) is widely used to measure the performance of the SCM. The BSC framework suggests that balance is obtained by adopting performance measures from four different areas. In this study, we analyzed the causal relationship of SCM performance based on BSC framework. First, we reviewed the nested causal relationships among four different perspective of the BSC, namely, business process perspective, customer perspective, financial perspective, and innovation and learning perspective. Then, we used the chi-square difference test to identify the best model to fit the causal relationship of SCM performance. Of the 800 questionnaires posted, a total of 265 questionnaires were returned after one follow-up. A total of 66 questionnaires were eliminated due to largely missing values. The major finding says alternative model 3 is dominant to other models to fit causal relationships among four different perspective of the BSC. Innovation and learning perspective positively influence on customer perspective, business process perspective, and financial perspective. Business process perspective also positively influence on customer perspective and financial perspective whereas customer perspective does not influence on financial perspective significantly.