• 기록학연구
• /
• 제79호
• /
• pp.305-341
• /
• 2024

이 연구는 디지털 환경에서 데이터가 중심이 되는 전자기록의 출처에 새롭게 접근하기 위해, 데이터 출처 개념과 출처 모델을 검토하고 수용하여, 어떻게 전자기록을 대상으로 새롭게 출처 개념을 적용할 수 있을지의 가능성을 살펴보았다. 이어서 데이터 중심의 전자기록을 대상으로 한 출처 표현 모델을 개발하기 위해 기초 연구를 진행하였다. 특히 소급형 출처와 전망형 출처 개념으로 전환할 것과, 기록관리 메타데이터와는 별개의 모델을 통해 출처를 표현하고 기록과 연결할 수 있는 모델을 개발할 것을 제안하였다. 기록과 동적 관계를 맺으면서도 독립적으로 출처를 표현할 수 있는 모델을 개발할 수 있다면, 오히려 기록의 유동성을 보장할 수 있으면서도, 기록의 속성과 이를 지원할 출처의 역할을 더 충실히 수행할 수 있을 것이다. 결국, 이 연구가 제안한 기본적인 모델 개발 방향을 수용하는 출처 모델은 기록의 고정성과 활동의 재현성, 재현의 신빙성을 뒷받침할 수 있을 것이며, 디지털환경에서 적합한 출처 모델로서 역할을 할 수 있을 것이다.

• 지능정보연구
• /
• 제15권3호
• /
• pp.31-51
• /
• 2009

정보시스템 개발 프로세스와 기법에 대한 연구는 1960년대 이후 지속적으로 이뤄져 왔으나 실제 개발 현장에 성공적으로 적용되는 사례는 적은 경우에 불과하다. 최근 기술 발전과 더불어 모델 기반의 정보시스템 개발 기법인 MDD(Model-Driven Development)가 많은 관심을 모으고 있다. MDD의 발전과 더불어 그 효과를 검증하기 위해 다양한 연구가 이뤄지고 있으나, 대부분은 사례연구를 통해 얻어진 교훈이나, 제한된 측정 데이터로 분석된 효과를 제시하고 있다. 본 연구에서는 MDE(Model-Driven Engineering)의 기술현황 및 주요 이슈를 알아보고, MDE 도입을 검토하는 조직을 위해 효과성 측정을 위한 기존 연구 결과를 기술적, 조직적 측면에서 정리하였다. 또한, MDD를 실제 정보시스템 개발 프로세스에 적용한 사례연구를 통해 새로운 측정지표로 정량적, 정성적 효과성을 측정하였다. 더불어, MDE 도입시 주요 고려사항과 사례연구를 통해 얻은 교훈을 기술적, 조직적 차원에서 제시한다.

• 한국정보컨버전스학회논문지
• /
• 제1권1호
• /
• pp.41-46
• /
• 2008

웹 기술 기반의 콘텐츠 개발 및 운영으로 다른 환경에서의 콘텐츠 활용을 토대로 교육자원의 정보들을 통합 운영할 수 있는 관리 중심체인 e-learning 시스템의 중요성과 필요성이 대두되고 있으며, 교육용 어플리케이션은 현재 표준화되지 않은 개발 프로세스를 기반하여 개발하고 있는 실정이다. 따라서, 교육 콘텐츠의 재사용을 높이기 위해 국제적 학습 표준인 SCORM(Sharable Content object Reference Model)을 기반으로 하나의 플랫폼에 있어서 시스템 개발 중 다른 플랫폼으로의 재사용이 가능한 핵심자산을 이용하여 조립, 생산할 수 있는 방안으로 체계적인 교육자원을 개발하고 지원하기 위한 교수-학습지원 시스템 개발에 초점을 둔 연구가 요구된다. 따라서, 본 논문에서는 교육적 도메인으로 접근하여 MDA(Model Driven Architecture)상의 교수-학습지원 시스템을 정의한다. 또한 학습콘텐츠 표준 메타데이터를 이용하여 콘텐츠에 관한 분석 및 설계를 하고 MDA 자동화 툴을 이용한 핵심자산을 통해 실제 교수자가 필요로하는 콘텐츠를 제공할 수 있는 교수-학습지원 시스템을 개발하고자 한다.

• 대한의용생체공학회:의공학회지
• /
• 제31권4호
• /
• pp.310-315
• /
• 2010

Estimation of muscle forces is important in biomechanics, therefore many researchers have tried to build a muscle model. Recently, optimization techniques for adjusting muscle parameters, i.e. EMG-driven model, have been used to estimate muscle forces and predict joint moments. In this study, an EMG-driven model based on the previous studies has been developed and isometric and isokinetic contraction movements were evaluated to validate the developed model. One healthy male participated in this study. The dynamometer tasks were performed for maximum voluntary isometric contractions (MVIC) for ankle dorsi/plantarflexors, isokinetic contraction at both $30^{\circ}/s$ and $60^{\circ}/s$. EMGs were recorded from the tibialis anterior, gastrocnemius medialis, gastrocnemius lateralis and soleus muscles at the sampling rate of 1000 Hz. The MVIC trial was used to customize the EMG-driven model to the specific subject. Once the subject's own model was developed, the model was used to predict the ankle joint moment for the other two dynamic movements. When no optimization was applied to characterize the muscle parameters, weak correlations were observed between the model prediction and the measured joint moment with large RMS error over 100% (r = 0.468 (123%) and r = 0.060 (159%) in $30^{\circ}/s$ and $60^{\circ}/s$ dynamic movements, respectively). However, once optimization was applied to adjust the muscle parameters, the predicted joint moment was highly similar to the measured joint moment with relatively small RMS error below 40% (r = 0.955 (21%) and r = 0.819 (36%) and in $30^{\circ}/s$ and $60^{\circ}/s$ dynamic movements, respectively). We expect that our EMG-driven model will be employed in our future efforts to estimate muscle forces of the elderly.

• 대한기계학회논문집A
• /
• 제20권4호
• /
• pp.1251-1262
• /
• 1996

In this paper, a mathematical model for a belt driven system is proposed to analyse the vibration characteristics of the driving units with belts and the free and forced vibraiton anlyses are carried out. The mathematical model for a belt-driven system includes belts, pulleys, spindle and bearings. By using Hamilton's principle, four nonlinear governing equations and twelve nonlinear boundary conditions are derived. To linearize and discretize the nonlinear governing equations and boundary conditions, the perturbation method and Galerkin method are used. Also, the free vibration analyses for various parameters of a belt driven system, which are the tension of a belt, the length of a belt, the material properties of belts, the velocity of a velt and the mass of pulley are made. The forced vibration analyses of the system are performed and the dynamic responses for main parameters are anlysed with a belt driven system.

• 전기학회논문지
• /
• 제56권12호
• /
• pp.2247-2250
• /
• 2007

This paper presents an automated API translator for embedded software development based on a model-driven approach. Since MDA(Model Driven Architecture) provides little support for the development of embedded software, we propose a new approach containing its advantages. First, we define #generic APIs# which do not depend on any RTOS#s but provide most of typical RTOS services. We can describe RTOS-related behaviors of target application using these generic APIs in a CIC(Common Intermediate Code). Then, we propose a transformation tool for translating between a CIC using generic APIs and a C-code for specific RTOS. The proposed API translator converts them using XML transformation rule which is defined outside. It indicates that an API translator extends to other RTOS#s by modifying or adding the transformation rule. From the experiment. we validate the proposed method.

• 한국정보시스템학회지:정보시스템연구
• /
• 제14권3호
• /
• pp.1-8
• /
• 2005

This paper formally defines a role-driven security and access control model of a business process in order eventually to provide a theoretical basis for realizing the secured business process management systems. That is, we propose a graphical representation and formal description of the mechanism that generates a set of role-driven security and access control models from a business process modeled by the information control net(ICN) modeling methodology that is a typical business process modeling approach for defining and specifying business processes. Based upon the mechanism, we are able to design and accomplish a secured business process management system that provides an unified resource access control mechanism of the business process management engine domain's and the application domain's. Finally, we strongly believe that the secured access control policies from the role-driven security and access control model can be easily transformed into the RBAC(Role-based Access Control) model that is a standardized security technology for computer and communications systems of commercial and civilian government organizations.

• 대한의용생체공학회:의공학회지
• /
• 제35권5호
• /
• pp.142-150
• /
• 2014

The key to model-based iterative reconstruction (MBIR) algorithms for transmission computed tomography lies in the ability to accurately model the data formation process from the emitted photons produced in the transmission source to the measured photons at the detector. Therefore, accurately modeling the system matrix that accounts for the data formation process is a prerequisite for MBIR-based algorithms. In this work we compared quantitative performance of the three representative ray-driven methods for calculating the system matrix; the ray-tracing method (RTM), the distance-driven method (DDM), and the strip-area based method (SAM). We implemented the ordered-subsets separable surrogates (OS-SPS) algorithm using the three different models and performed simulation studies using a digital phantom. Our experimental results show that, in spite of the more advanced features in the SAM and DDM, the traditional RTM implemented in the OS-SPS algorithm with an edge-preserving regularizer out-performs the SAM and DDM in restoring complex edges in the underlying object. The performance of the RTM in smooth regions was also comparable to that of the SAM or DDM.

• 음성과학
• /
• 제9권1호
• /
• pp.39-47
• /
• 2002

This paper proposes an effective method to remedy the acoustic modeling problem inherent in the usual log-normal Parallel Model Composition intended for achieving robust speech recognition. In particular, the Gaussian kernels under the prescribed log-normal PMC cannot sufficiently express the corrupted speech distributions. The proposed scheme corrects this deficiency by judiciously selecting the 'fairly' corrupted component and by re-estimating it as a mixture of two distributions using data-driven PMC. As a result, some components become merged while equal number of components split. The determination for splitting or merging is achieved by means of measuring the similarity of the corrupted speech model to those of the clean model and the noise model. The experimental results indicate that the suggested algorithm is effective in representing the corrupted speech distributions and attains consistent improvement over various SNR and noise cases.

• 한국CDE학회논문집
• /
• 제14권2호
• /
• pp.96-104
• /
• 2009

It gradually becomes important to study on how to efficiently integrate and manage plant lifecycle data such as 2D schematic and 3D solid data, logical configuration data, and equipment specifications data. From this point of view, converting plant design data from various systems into neutral data independent from any commercial systems is one of important technologies for the operation and management of plants which usually have a very long period of life. In order to achieve this goal, a neutral model for efficient integration and management of plant data was defined. After schema mapping between one of specification-driven plant design systems and the neutral model was performed, a plant data translator is also implemented according to the mapping result. Finally, by experiments with nuclear power plant design, the feasibility of the translator was demonstrated.