• Spatial Information Research
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• v.13 no.3 s.34
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• pp.221-237
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• 2005

This study attempts at building a GIS computing environment that incorporates object-relational spatio-temporal database for the time geography model with space-time path, space-time prism and space-time accessibility. The proposed computing environment is composed of ( i ) mobile GIS application for collecting spatio-temporal trajectory data of an individual, ( ii ) spatio-temporal database server that includes time geography model, and (iii) geovisualization client that performs time geographic queries to the spatio-temporal database. The spatio-temporal trajectory data collected by GPS-PDA client is automatically processed and sent to server through data management middleware. The spatio-temporal database implemented by extending a generic DBMS provides spatio-temporal objects, functions, and SQL. The geovisualization client illustrates 3D visual results of the queries about space-time path, space-time prism, and space-time accessibility. This study confirms the possibility of integrating mobile GIS and DBMS for time geography model, and it presents the appropriate database model with spatio-temporal objects and functions that may handle very large data for time geography application.

• Proceedings of the Technology Innovation Conference
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• 2009.02a
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• pp.155-155
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• 2009

개방형 혁신(Open Innovation)은 조직 내부에 국한되어 있던 기술개발 활동을 기업 외부까지 확장하여 외부 기술지식과 내부 기술력을 함께 활용하는 혁신성과 극대화 전략을 의미한다. 개방형 혁신은 기술개발의 성공률이 높고, 비용이 상대적으로 저렴하다는 장점을 갖고 있어 이에 근거한 기술중개서비스 전문기업들이 글로벌시장에서 활동하고 있다. 그 대표적인 사례가 나인시그마(NineSigma) 및 이노센티브(InnoCentive)이다. 그러나, 그러나 현재까지 이들 기업은 매출액 및 R&D 투자가 일정규모 이상인 글로벌 대기업을 대상으로 하고 있으며, 중소기업을 수혜자로 한 개방형 혁신 서비스는 충분히 제공되고 있지 않다. 본 연구에서는 부품 소재 중소기업을 주요 수요자로 한 개방형 혁신 기술중개서비스 모델을 제안하고 있다. 국내 부품 소재산업의 경쟁력 제고의 핵심 관건은 부품소재 중소기업의 기술혁신 역량 강화로 볼 수 있다. 본 연구에서는 개방형 혁신의 장점을 부품소재 중소기업에서 활용하기 위한 필요조건을 조사하고, 그에 근거하여 개방형 혁신 중개서비스 모델에 포함된 다양한 혁신주체들의 역할을 제안하였다. 본 연구의 세부 내용을 구조화하여 제시하면 다음과 같다. (1) 개방형 기술혁신체제의 정의와 동향 검토 (2) 국내외 개방형 기술혁신의 사례 조사 (3) 부품 소재기업 대상의 개방형 기술혁신체제 도입 필요성 타당성 검토 (4) 부품 소재산업 개방형 기술혁신 모델 개발 (5) 국내 부품 소재산업 발전을 위한 개방형 기술혁신 활성화 정책과제 검토

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.8 no.5
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• pp.339-344
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• 2015

NHPP software reliability models for failure analysis can have, in the literature, exhibit either constant, monotonic increasing or monotonic decreasing failure occurrence rates per fault. In this paper, infinite failures NHPP models that repairing software failure point in time reflects the situation, was presented for comparing property. Commonly used in the field of software reliability based on Weibull extension distribution software reliability of infinite failures was presented for comparison problem. The result is that a relatively large shape parameter was effectively. The parameters estimation using maximum likelihood estimation was conducted and Model selection was performed using the mean square error and the coefficient of determination. In this research, software developers to identify software failure property follows shape parameter, some extent be able to help is considered.

• The KIPS Transactions:PartC
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• v.9C no.5
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• pp.725-732
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• 2002

Presented is a Genetic Algorithm (GA) for dynamic partitioning an ATM LANE(LAN Emulation) network. LANE proves to be one of the best solutions to provide guaranteed Quality of Service (QoS) for mid-size campus or enterprise networks with minor modification of legacy LAN facilities. However, there are few researches on the efficient LANE network operations to deal with scalability issues arising from broadcast traffic delivery. To cope with this scalability issue, proposed is a decision model named LANE Partitioning Problem (LPP) which aims at partitioning the entire LANE network into multiple Emulated LANs (ELANS), each of which works as an independent virtual LAN.

• Journal of the Korea Society of Computer and Information
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• v.12 no.4
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• pp.33-42
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• 2007

Accurate predictions of software release times, and estimation of the reliability and availability of a software product require quantification of a critical element of the software testing process : test coverage. This model called Enhanced non-homogeneous poission process(ENHPP). In this paper, exponential coverage and S-shaped model was reviewed, proposes the Kappa coverage model, which maked out efficiency application for software reliability. Algorithm to estimate the parameters used to maximum likelihood estimator and bisection method, model selection based on SSE statistics and Kolmogorov distance, for the sake of efficient model, was employed. From the analysis of mission time, the result of this comparative study shows the excellent performance of Burr coverage model rather than exponential coverage and S-shaped model using NTDS data. This analysis of failure data compared with the Kappa coverage model and the existing model(using arithmetic and Laplace trend tests, bias tests) is presented.

• Journal of the Korean Society for Railway
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• v.12 no.4
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• pp.488-498
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• 2009

The characteristics of intercity rail network are different from those of public transit network in urban area. In this paper, we proposed a new transit assignment model which is generalized form of deterministic assignment model by introducing line selection probability on route section. This model consider various characteristics of intercity rail and simplify network expansion for appling search algorithms developed in road assignment model. We showed the model availability by comparing with existing models using virtual networks. The tests on a small scale network show that this model is superior to existing models for predicting intercity rail demand.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.250-252
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• 2005

철차륜방식의 궤도시스템과 마찬가지로 자기부상차량 시스템 역시 정해진 경로로 주행하기 위한 분기장치가 반드시 필요하고, 대차가 궤도를 감싸고 주행하는 외형적 특성으로 분기장치의 구조가 커지고 동작이 복잡해지는 특징을 가지고 있다. 본 논문은 도시형 자기부상차량 시스템에 적용가능한 분기장치 형태들을 제안하고 있으며, 한국기계연구원의 도시형 자기부상차량 시험선로에 설치된 평행이동식 분기장치에 대한 설치 사양 및 운용현황 등을 설명하고 현재 개발이 진행중인 고속동작용 다관절 굴절식 분기장치의 1/5 scale 축소모형에 대한 개발현황 및 full scale 굴절식 분기장치로 확장할 때의 적용성 등을 제안하고 있다.

• Environmental and Resource Economics Review
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• v.16 no.3
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• pp.451-483
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• 2007

Recently, the problem of noise has received much attention in the urban environment. This paper attempts to measure the economic benefits of urban noise reduction in the metropolitan area. To this end, the dichotomous choice contingent valuation method is applied. In particular, recently proposed one and one-half bound model that reduces the potential for response bias in the double bound model while maintaining much of its efficiency. We surveyed a randomly selected sample of 800 households in the metropolitan area and asked respondents questions in person-to-person interviews about how they would willing to pay for the noise reduction. Respondents overall accepted the contingent market and were willing to contribute a significant amount (997 to 1,778 won), on average, per household per month. This willingness varies according to individual characteristics such as concerns about noise, dwelling area, and income. The aggregate value of the noise reduction in the sampled metropolitan area amounts to approximately 79.26 to 141.35 billion won per year.

• Journal of Korea Water Resources Association
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• v.31 no.5
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• pp.515-528
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• 1998

A quasi-two-dimensional model for simulating the flood plain flow is developed. The model consists, in general, of a multiply-connected network which combines the main channel and two-dimensional flood plain cells. The main channel flow is described by the Saint Venant equations for one-dimensional unsteady flow, and the flood plain flow by the cell continuity and river-or weir-type stage-discharge relations between flood plain cells. The implicit algorithm for unsteady flow in looped channel network is extended to incorporate the flood plain flow. To verify the performance of the model, it is applied to three test problems, and sensitivities to various model parameters are analyzed. It turns out that the present model gives more accurate result than that by Cunge (1975) as the shape of cross section becomes more complex and irregular. Not only the inundation of water from the main channel but the return flow from the flood plain is successfully simulated.

• The Transactions of the Korea Information Processing Society
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• v.5 no.8
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• pp.2041-2049
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• 1998

This paper suggests a technique for program segmentation and maintenance using PSDG(Post-State Dependency Graph) that improves the quality of a software by identifying and detecting defects in already fixed source code. A program segmentation is performed by utilizing source code analysis which combines the measures of static, dynamic and semantic slicing when we need understandability of defect in programs for corrective maintanence. It provides users with a segmental principle to split a program by tracing state dependency of a source code with the graph, and clustering and highlighting, Through a modeling of the PSDG, elimination of ineffective program deadcode and generalization of related program segments arc possible, Additionally, it can be correlated with other design modeb as STD(State Transition Diagram), also be used as design documents.