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

• 산업경영시스템학회지
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• 제40권2호
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• pp.99-103
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• 2017

Productivity improvement is one of the important goals which firms' technology developments aim at. Firms' improved productivity from technology development means that their inputs can produce more outputs through technology development, which makes firms' productivity improvement from technology development more and more important in the age of technology advance and convergence like today. This research empirically analyzes the influence of the external technology collaboration network diversity on the productivity improvement of the small and medium-sized enterprises (SMEs) from technology development and the moderating effect of the chief technology officer (CTO)-driven technology development on this influence. This study constructs the research model reflecting the moderating impact of the CTO-driven technology development and tests it with the ordinary least squares regression through the IBM SPSS version 23 by using the 2,000 data about South Korean SMEs. This research empirically reveals two points. One is that SMEs' external technology collaboration network diversity has a positive influence on their productivity improvement from technology development. The other is that the positive effect of SMEs' external technology collaboration network diversity on their productivity improvement from technology development is moderated by the CTO-driven technology development. The two points revealed in this study present two meaningful implications in not only the practical but also academic point of view. The practical implication is that it is effective for SMEs to use CTOs in increasing their productivity improvement from technology development. The academic implication is that making technology collaboration with more diverse external partners can increase SMEs' productivity improvement from technology development.

• 한국정보과학회논문지:소프트웨어및응용
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• 제32권3호
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• pp.153-162
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• 2005

컴포넌트 기반 개발(CBD) 기술은 컴포넌트 재사용을 통해 S/W 개발 생산성을 높이는 기술로 각광을 받고 있다. 모델기반 아키텍처 (Model Driven Architecture, MDA)는 설계 모델을 점진적으로 변환하여 S/W를 자동으로 생성하는 새로운 개발 방식이다［1］. CBD기술은 재사용을 통하여, MDA 기술은 모델 변환을 통하여 S/W 개발 생산성을 높이므로, 이 두 기술의 접목은 SW 재사용과 자동 생산의 두 가지 장점을 모두 이룰 수 있다. 이를 위해서는 설계된 컴포넌트를 MDA의 플랫폼 독립적 모델 (PIM)로 명세하여야 하며, UML 확장 장치 즉 CBD용 UML 프로파일이 요구된다. 본 논문에서는 명세할 컴포넌트의 구성요소를 메타 모델로 정의하고, 각 구성요소를 PIM으로 명세하기 위한 컴포넌트용 UML 프로파일을 제안한다. 이 프로파일은 컴포넌트 명세를 위한 스테레오 타입, 구문(Syntactic), 의미 (Semantic), 규약(Contract) 및 표기법으로 이구어진다. 제안된 프로파일은 MDA 표준 규약의 기반인 Meta Object Facility (MOF)를 확장 적용한 것이므로 여러 MDA 기법과 도구들과 호환을 제공한다. 제안된 프로파일을 적용하면 CBD와 MDA의 고유 기능과 장점을 접목하여 높은 개발 생산성, 이식성, 상호 운용성, 및 유지보수성을 가질 수 있다.

• 인터넷정보학회논문지
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• 제20권2호
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• pp.69-76
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• 2019

Recent Enterprise System has component driven real-time distributed architecture (RDA) and this kind of architecture should performed with satisfying strict constraints on life cycle of object and response time such as synchronization, transaction and so on. Microsoft's .NET platform supports RDA and is able to implement services including before mentioned time restriction and security service by only specifying attribute code and maximizing advantages of OMG's Model Driven Architecture (MDA). In this study, a method to automatically generate an extended model of essential elements in an enterprise-system-based RDA as well as the platform specific model (PSM) for Microsoft's .NET platform are proposed. To realize these ideas, the functionalities that should be considered in enterprise system development are specified and defined in a meta-model and an extended UML profile. In addition, after defining the UML profile for .NET specification, these are developed and applied as plug-ins of the open source MDA tool, and extended models are automatically generated using this tool. Accordingly, by using the proposed specification technology, the profile and tools can easily and quickly generate a reusable extended model even without detailed coding-level information about the functionalities considered in the .NET platform and RDA.

• Structural Engineering and Mechanics
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• 제21권1호
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• pp.1-18
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• 2005

Foschi's connector model is used as a basic component in the development of nonlinear analysis programs for timber structures. This paper presents the extension of the model to include the effect of shaft frictional forces. The wood medium is modeled using the Foschi embedment model, while shaft friction is modeled using an elastic Coulomb-type friction model. The initial confining pressure for the case of driven fasteners is accounted for by a lateral shift of the load-embedment curve. The model is used to compute the cyclic response of both driven and inserted fasteners. The results obtained from the cases studied indicate that initial confining pressure and friction do not have a significant effect on the computed hysteretic response, however, they significantly affect the computed amount of fastener withdrawal. This model is particularly well-suited for modeling the hysteretic response of shear walls with moderate fastener withdrawal under lateral cyclic or earthquake loading.

• 한국정보과학회논문지:소프트웨어및응용
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• 제35권12호
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• pp.705-715
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• 2008

SUGV의 활용이 늘어감에 따라 구성하는 소프트웨어가 복잡해지고 개발 환경 다양화로 인한 상호운용성 문제가 대두되고 있다. 본 논문에서는 이러한 문제점을 해결하고자 기존의 UML 프로파일 메커니즘을 이용하여 SUGV 개발에 MDA가 적용되도록 하였다. 이를 통해 이종 SUGV 소프트웨어 설계시 타겟 독립 모델을 만든 후 UML 프로파일이 적용된 자동화 도구를 이용해 타겟 종속 모델 및 코드를 생성하면 이종 기기의 개발기간과 노력을 절약할 수 있다. 그리고 발생된 코드의 분석을 통해 제안한 방법의 이점 및 신뢰성을 확인할 수 있었다.

• 한국압력기기공학회 논문집
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• 제19권1호
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• pp.44-51
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• 2023

The RCP is one of the main components in nuclear power plants and plays an important role in circulating coolant to the RCS system. Currently, nuclear plants are monitored using various monitoring systems. However, since they operate independently according to their functional purpose, it is not able to analyze vibration and operation/performance information comprehensively, and thus failure diagnosis accuracy is limited. In addition, these systems do not provide some important information (such as fault type, parts and cause) necessary for emergency actions, but provide only alarm information. To improve these technical problems, this study proposes a diagnosis technique (M/L, Rule-based model, Data-driven model, Narrow band model) and methodology for comprehensive analysis.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제13권1호
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• pp.24-34
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• 2007

상황정보기반 컴포넌트 모델은 상황인식 어플리케이션이 상황정보에 민감한 부분과 그렇지 않은 부분으로 구성된다는 아이디어에서 출발하여, 상황정보에 민감한 부분을 각 상황정보의 모습과 수행 조건에 따라 분할하고 각각을 소프트웨어 컴포넌트로 구성하는 모델이다. 본 모델은 상황인식 컴포넌트들을 조합하는 방식으로 어플리케이션을 구현함으로써, 상황인식 어플리케이션의 상황정보에 따른 확장성을 지원한다. 더불어 어플리케이션 소스코드 자체에 내재되어져 있는 상황정보를 어플리케이션 로직과는 분리시킴으로써, 변화하는 상황정보에 효율적으로 적응하도록 한다. 본 모델이 갖는 특성을 보이기 위하여, 대표적인 상황인식 어플리케이션의 하나인 Call-forwarding 어플리케이션 구현에 제안한 모델을 적용하고, 이를 통해 실제 상황정보 확장에 대한 지원과 상황정보의 분리를 어떻게 해결하는지를 분석한다.

• 한국자동차공학회논문집
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• 제21권4호
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• pp.181-187
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• 2013

Performance of DI diesel engine with high fuel injection method is directly related to its emission characteristics and fuel consumption. In this study, numerical model of 3rd generation piezo-driven injector was designed to analyze the hydraulic performance. Also the injection response characteristics was investigated by using the AMESim simulation code. From this study, it was shown that 3rd generation piezo-driven injector had a faster response and had better control capability due to its hydraulic bypass-circuit that has potential to higher hydraulic characteristics and improved accuracy of injected fuel quantity.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2001년도 International Conference CALS/EC KOREA
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• pp.277-288
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• 2001

Nowadays, for the competitive power of an enterprise, there are many attempts to implement information system that could support business innovation by business process re-engineering. However, there is no effort to standardize the core business processes of enterprise based on standards of data, documents. These facts make it difficult to introduce and implement enterprise information system designed by business processes of the higher level. Therefore, standardization of business process by analyzing the functionality and relationships among them are important and necessary. The results of our research are summarized as process-driven standardization (standardization of core business processes) and development of a repository. In process-driven standardization, we proposed the reference model by analyzing the business processes of the leading enterprises for core business processes. The reference model focuses on core business processes, such as sales management, procurement management, production management, logistics management, and customer support in manufacturing industry. We developed a knowledge-based system as a repository for a integrated management system of business process. And this repository was built up web-based system for the purpose of both reference and management.