• 정보과학회 논문지
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• 제42권8호
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• pp.972-978
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• 2015

비휘발성 메모리는 바이트 단위 접근과 비휘발성을 지원한다. 이러한 특성들은 비휘발성 메모리를 캐시, 메모리, 디스크와 같은 메모리 계층 구조 가운데 하나의 영역으로 사용을 가능케 한다. 비휘발성 메모리의 흥미로운 특성은 데이터 보존 기간이 실제로는 제한적인 기간을 가지고 있다는 것이다. 게다가 데이터 보존 기간과 쓰기 지연간의 트레이드오프가 존재 한다. 본 논문에서는 이를 활용하여 비휘발성 메모리를 파일 캐시로 사용하는 새로운 관리 기법을 제안한다. 제안하는 기법은 기존의 캐시 관리 기법과는 반대로 짧은 데이터 보존 시간으로 데이터를 저장하고 쓰기 성능을 개선한다. 제안하는 기법은 LRU 대비 평균 접근 지연 시간을 최대 31%, 평균 24.4%로 감소시킴을 보인다.

• Nuclear Engineering and Technology
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• 제51권4호
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• pp.968-976
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• 2019

This paper presents a number of verification case studies for a recently developed sensitivity/uncertainty code package. The code package, ROMUSE (Reduced Order Modeling based Uncertainty/Sensitivity Estimator) is an effort to provide an analysis tool to be used in conjunction with reactor core simulators, in particular the Virtual Environment for Reactor Applications (VERA) core simulator. ROMUSE has been written in C++ and is currently capable of performing various types of parameter perturbations and associated sensitivity analysis, uncertainty quantification, surrogate model construction and subspace analysis. The current version 2.0 has the capability to interface with the Design Analysis Kit for Optimization and Terascale Applications (DAKOTA) code, which gives ROMUSE access to the various algorithms implemented within DAKOTA, most importantly model calibration. The verification study is performed via two basic problems and two reactor physics models. The first problem is used to verify the ROMUSE single physics gradient-based range finding algorithm capability using an abstract quadratic model. The second problem is the Brusselator problem, which is a coupled problem representative of multi-physics problems. This problem is used to test the capability of constructing surrogates via ROMUSE-DAKOTA. Finally, light water reactor pin cell and sodium-cooled fast reactor fuel assembly problems are simulated via SCALE 6.1 to test ROMUSE capability for uncertainty quantification and sensitivity analysis purposes.

• 벤처창업연구
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• 제11권2호
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• pp.167-182
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• 2016

본 연구는 중소기업의 전략적 자원으로 인식되고 있는 최고경영자의 역량 중 기술적 역량이 기업성과에 미치는 영향과 기업의 기술적 역량이 최고경영자 기술적 역량과 기업성과사이에 매개역할을 하는지에 대해 분석하였다. 분석을 위한 총 표본은 기술보증기금에서 보유하고 있는 중소기업 데이타를 활용하였으며, 분석결과 CEO의 기술적 역량은 기업의 기술적 역량에 유의한 정(+)의 영향을 미치는 것으로 나타나 고학력일수록, 동업종종사경험이 많을수록 연구개발 활동에 적극적임을 알 수 있었고, 기술파급효과와 경영성과에는 유의한 영향을 미치나 기술성과인 특허건수, 출원 중 특허건수에는 유의한 부(-)의 영향을 미치는 것으로 나타났다. 기업의 기술적 역량이 CEO의 기술적 역량과 기술성과인 특허건수, 출원중 특허 건수에는 유의한 부(-)의 매개효과가 나타났으나, CEO의 기술적역 량과 기술적 파급 효과간, CEO의 기술적 역량과 경영성과 간에는 매개역할을 하지 않은 것으로 나타났다. CEO의 기술적 역량이 기업의 기술적 역량인 기업기술개발 능력과 경영성과에 유의한 영향을 미치므로 전문지식에 바탕을 둔 이공계 창업이 일반 창업보다 성공가능성이 높다는 것을 보여준다.

• 융합보안논문지
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• 제15권4호
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• pp.43-55
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• 2015

ICT가 사회 주요 기반 구조로 자리매김 함에 따라 사이버 역량 강화 필요성이 대두되고 있다. 그러나 국내에 효과적인 사이버 역량 평가 방법론이 존재하지 않아 우리나라의 사이버 역량을 평가하고, 이에 기반한 역량 강화 방안 마련이 어려운 실정이다. 사이버 역량 평가는 우리의 사이버 역량 실태를 점검하여 정책 방향 수립에 활용하고 효과적인 예산 편성을 위한 근간을 제공할 수 있다. 그러나 현실적으로 사이버 역량 평가 항목이 다양하고, 각 항목의 판단 척도가 상이하여 의사 결정자가 판단하는데 어려움이 존재한다. 이에 본 논문에서는 AHP와 TOPSIS를 융합한 사이버 역량 평가 방법론을 제안하였다. AHP는 다양한 평가 항목간의 중요도 판별에 활용하고, TOPSIS는 평가 대상국 간의 순위 판별에 활용하였고, 가상 실험 데이터를 이용하여 주요 4개국에 대한 평가를 수행하였다. 실험 결과 제안한 사이버 평가 방법론은 AHP를 이용한 사이버 평가에 비해 평가 항목과 평가 대상국의 확장이 가능하고, 보다 정교한 수학적 기반을 통해 객관적인 평가가 가능한 것으로 나타났다.

• 한국IT서비스학회지
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• 제9권1호
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• pp.27-42
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• 2010

Recently, many organizations are actively adopting Enterprise Architecture (EA) as a methodology to manage IT assets and build IT-based business system. However, most existing studies on EA have focused on the adoption stage of EA. Now the research concerning effective management and utilization of EA after adopting EA is keenly required. This study intended to empirically examine how the role of EA operating unit and the EA utilization capability of organizational members impact on EA performance at the post-adoption stage of EA. Based on Resource Based View (RBV), this study proposed the model and the hypotheses describing that the impact of the role of EA operating unit on EA performance is mediated by the EA utilization capability of organizational members. In order to test the hypotheses, the field survey whose respondents were seventy four Korean public agencies which have adopted EA was conducted by means of questionnaire. Data analysis was done with partial least square (PLS), which is a structural equation modeling (SEM) technique that uses a component-based approach to estimation. The results of the empirical analyses showed that the organizational operation ability of EA operating unit significantly influenced EA performance via the EA utilization capability of organizational members, but that EA education and training performed by EA operating unit did not. The results of this study provided a lot of theoretical and practical implications regarding EA management activities at the post-adoption stage of EA to enhance EA performance.

• 한국시스템다이내믹스연구
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• 제15권4호
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• pp.85-100
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• 2014

We propose a composite make or buy decision model considering both the transaction cost theory and the resource based view in the Korean defense industry using System Dynamics. We analyze relationship between core variables(transaction frequency, technological uncertainty, the level of technological dependency, technological level and acquisition ability for market information) and 'Make or Buy decision' focused on technological innovation capability. Based on the result, we propose the implications as follows : First, the defence industry needs more R&D investment. Second, it needs a balance between domestic(Make) and overseas(Buy) to increase the technological capability rapidly.

• Asia pacific journal of information systems
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• 제17권3호
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• pp.131-146
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• 2007

Recently, the role of IT service providers has been enlarged from managing a single function or system to reconstructing entire information management processes in new ways to contribute to shareholder value across the enterprise. This movement toward extensive and complex outsourcing agreements has been driven by the assumption that outsourcing information technology functions is a reliable approach to maximizing resource productivity. Hiring external IT service providers to manage part or all of its information-related services helps a firm focus on its core business and provides better services to its clients, thus obtaining sustainable competitive advantage. This practice of focusing on the strategic aspect of outsourcing is referred to as strategic sourcing where the focus is capability sourcing, not procurement. Given the importance of the strategic outsourcing, however, to our knowledge, there is little empirical research on the relationship between the strategic outsourcing orientation and outsourcing performance. Moreover, there is little research on the factor that makes the strategic outsourcing effective. This study is designed to investigate the relationship between strategic IT outsourcing orientation and IT outsourcing performance and the process through which strategic IT outsourcing orientation influences outsourcing performance, Based on the framework of strategic orientation-performance and core competence based management, this study first identifies core competency orientation as a proper strategic orientation pertinent to IT outsourcing and IT outsourcing process management capability as the mediator to affect IT outsourcing performance. The proposed research model is then tested with a sample of 200 firms. The findings of this study may contribute to the literature in two ways. First, it draws on the strategic orientation - performance framework in developing its research model so that it can provide a new perspective to the well studied phenomena. This perspective allows practitioners and researchers to look at outsourcing from an angle that emphasizes the strategic decision making to outsource its IT functions. Second, by separating the concept of strategic orientation and outsourcing process management capability, this study provides practices with insight into how the strategic orientation can work effectively to achieve an expected result. In addition, the current study provides a basis for future studies that examine the factors affecting IT outsourcing performance with more controllable factors such as IT outsourcing process management capability rather than external hard-to-control factors including trust and relationship management. This study investigates the major factors that determine IT outsourcing success. Based on strategic orientation and core competency theories, we develop the proposed research model to investigate the relationship between core competency orientation and IT outsourcing performance and the mediating role of IT outsourcing process management capability on IT outsourcing performance. The model consists of two independent variables (core-competency-orientation and IT outsourcing process management capability), and two dependent variables (outsourced task complexity and IT outsourcing performance). Comprehensive data collection was conducted through an outsourcing association. The survey data were analyzed using a structural analysis method. IT outsourcing process management capability was found to mediate the effect of core competency orientation on both outsourced task complexity and IT outsourcing performance. Further analysis and findings are discussed.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.171-172
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• 2008

We propose the sensor networks middleware based on publish/subscribe model for adaptive service to client. Publish/subscribe middleware make capability of sensor to data through the advertisement message. Based on capability of sensor, Publish/subscribe middleware adaptively service to client. And client make a collection of information that it require. Therefore middleware service more effectively.

• 품질경영학회지
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• 제30권3호
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• pp.66-78
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• 2002

Process capability indices are being used as indicators for measurements of process capability for SPC of quality assurance system in industries. In view of the enhancement of customer satisfaction, process capability indices in which loss functions are used to deal with the economic loss In the processes deviated from the target, are in an adequate representation of the customer's perception of quality In this connection, the loss function has become increasingly important in quality assurance. Taguchi uses a modified form of the quadratic loss function to demonstrate the need to consider the proximity to the target while assessing its quality. But this traditional quadratic loss function is inadequate to assessing the quality and quality improvement since different processes have different sets of economic consequences on the manufacturing, Thereby, a flexible approach to the development of the loss function needs to be desired. In this paper, we introduce an easily understood loss function, based on reflection of probability density function of the normal distribution. That is, the Reflected Normal Loss function can be adapted to an asymmetric loss as well as to a symmetric loss around the target. We propose that, instead of the process variation, a new capability index, CpI using the Reflected Normal Loss Function that can accurately reflect the losses associated with the process and a new capability index CpI Is compared with the classical indices as $C_{p}$ , $C_{pk}$, $C_{pm}$ and $C_{pm}$ $^{+}$.>.+/./.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2000년도 유체기계 연구개발 발표회 논문집
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• pp.345-350
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• 2000

The heat produced by the fission in the fuel of HANARO, 30 MW research reactor, is transferred from the primary cooling water to the secondary cooling water through heat exchangers, and the heat absorbed by the secondary cooling water is released into the atmosphere by the 33 MW cooling tower which is a mechanical induced draft and counter flow type. If the outlet temperature of cooling tower exceeds 33 of due to the loss of the cooling tower performance under reactor operation above $50\%$ of the full power, the reactor power should be reduced to half of the full power for safe operation. Therefore, the cooling capability of cooling tower should be maintained for the reactor to be normally operated. To predict the capability of cooling tower for full power reactor operation of 30 MW, the performance test of cooling tower was done at the reactor present power of 24 MW and the capability was respectively evaluated by characteristics and performance curves methods in accordance with the Code of Cooling Tower Institute of U.S.A. to confirm the reliability of evaluation. As a result, it was confirmed, through the results of each evaluation, that the cooling capability of cooling tower meets the design required heat load. Also, the equations of the performance and the characteristics curves of the cooling tower, based on the collected data during this performance test, was obtained for developing the calculation program to predict the cooling capability during reactor operation.