• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1998년도 제13차 학술회의논문집
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• pp.179-184
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• 1998

In this paper, a new hierarchical fuzzy inference system (HFIS) using structured Takagi-Sugeno type fuzzy inference units(FIUs) is proposed. The proposed HFIS not only solves the rule explosion problem in conventional HFIS, but also overcomes the readability problem caused by the structure where outputs of previous level FIUs are used as input variables directly. Gradient descent algorithm is used for adaptation of fuzzy rules. The ball and beam control is performed in computer simulation to illustrate the performance of the proposed controller.

• 한국자동차공학회논문집
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• 제4권3호
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• pp.122-129
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• 1996

The spark timing is one of major parameters to the engine performance and emissions. The ECU controls the spark timing based on preset values, which are functions of load and speed, in most of today's automotive SI engine. In this system, the preset spark timing can be different from optimum value due to the deviations from mass production, aging effects and so on. In the present study, a control logic is investigated for real time adaptation of spark timing to optimal value. It has been found that crank angle of miximum cylinder pressure is one of the appropriate parameters to estimate the optimum spark timing throught experiment. It has also been observed for spark timing convergence by variation of engineering model factors. The simulation program including engineering model for cycle by cycle variation of combustion is developed for surveying spark timing control logic. It is also shown that simulation results reflect experiment outputs and reasonableness of spark timing control logic for crank angle of maximum cylinder pressure.

• 디지털콘텐츠학회 논문지
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• 제7권1호
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• pp.25-33
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• 2006

유비쿼터스 시대가 도래함에 EK라 플랫폼 프로파일을 표현하는 다양한 방법들이 논의되었고 표준으로 발표되고 있다. 이러한 다양한 플랫폼 프로파일들은 몇 가지 문제점을 안고 있는데 이러한 문제점을 해결하기 위해, 다양한 프로파일을 인식하고 프로파일의 단순화를 통하여 적응화 엔진의 성능을 향상 시키는 프로파일 처리 방식을 제안하고 프로파일링 매커니즘을 개발한다. 즉, 서로 다른 적응화 시스템에서 사용하는 프로파일을 인식하지 못하는 문제를 해결하기 위한 여러 프로파일의 통합방식을 제시하고, 프로파일의 속성을 필수 속성 및 유사 값으로 그룹핑하여 프로파일의 단순화를 실현한다. 이 시스템을 통하여 기존 적응화 시스템에 비교하여 다양한 프로파일 형식의 사용자 요청을 처리할 수 있게 되고, 컴팩트한 프로파일은 콘텐츠 적응화 시스템을 운영하며 동적으로 생성되는 프로파일의 개수를 대폭 줄이게 되어 메모리 사용을 줄이고 콘텐츠 변환의 횟수를 줄이면서 적응화 엔진의 성능을 향상시키는데 기여한다.

• 서비스연구
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• 제6권2호
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• pp.23-35
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• 2016

기업은 신규사업진출을 통해 이윤확대와 기업성장을 도모한다. 기업의 신규사업진출은 신시장 확보, 새로운 이익창출로 기업발전과 좋은 일자리를 창출하는 창조경제실현에 기여한다. 그러나 신규사업진출은 새로운 기업 환경에의 적응, 신규투자의 부담, 사업성공의 불확실성 등을 수반하기 때문에 신규사업진출은 실패율이 매우 높은 위험한 의사결정이다. 따라서 신규사업진출을 위해서는 제품혁신, 프로세스 혁신, 비즈니스 모델 혁신, 파괴적 혁신, 전략적 혁신 등의 혁신 전략이 중요하며, 이를 성공적으로 추진함으로써 기업은 엄청난 경제적 성과를 얻게 된다. 특히 기업이 추구하는 신규사업과 아울러 기술혁신전략, IT개발은 모두 중요하며, 이들 간의 연계방안은 신규사업성공에 주요 요인으로 간주된다. 현대중공업은 국내 조선산업 및 정밀기계공업의 발전을 위해서 선박용 대형엔진사업을 추진하면서 신규사업 진출전략과 기술혁신전략 및 IT전략 간 연계의 중요성을 인식하고 이를 과감히 추구했다. 이 결과로 현대중공업은 유럽 및 일본의 엔진제작회사들과의 경쟁에서 이들을 넘어 세계 최대의 엔진제작회사로 올라섰다. 이 과정에서 현대중공업은 엔진사업진출의 성공을 위해 전략적 기술혁신전략을 추구했다. 본 연구는 이 전략의 핵심적인 내용으로서, 첨단 장비인 CNC공작기계의 도입과 장비운용에 필수적인 HEMAPT시스템의 개발을 추진해 국내 최초로 구축함으로써, 이를 기반으로 신사업진출에 성공한 사례를 조사, 분석해서 사업의 성공요인과 시사점을 제시한다.

• 농촌지도와개발
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• 제19권2호
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• pp.465-495
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• 2012

This study aims to propose the policy direction for agriculture and fisheries heritage system in Korea. The agriculture and fisheries heritage system is defined as traditional agricultural activity systems and landscapes which should be preserved, sustained and handed down and evolved from the co-adaptation of a community with its cultual, agricultural, biological environment. The key characteristics of the agriculture and fisheries heritage system of Korea are as follows; Firstly, this system designates software and hardware factor of heritage in integrative manner. secondly, this system seeks to preserve and utilize such heritages simultaneously. Thirdly, this system intends to strengthen the role of people in rural area. Fourthly, this system makes use of new engine of growth in agricultural community. This system is designed by comparing and reviewing several related domestic and foreign systems including FAO' GIAHS.

• 한국자동차공학회논문집
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• 제8권4호
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• pp.186-193
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• 2000

EPS(Electric Power Steering) systems have many advantages over traditional hydraulic power steering systems in space efficiency engine efficiency and environmental compatibility. In this paper an EPS system control logic using a torque map is proposed. The main function of the EPS system is to reduce the steering torque exerted by a driver by assist of an electric motor. Vehcile speed steering torque and steering wheel angle are measured and fed back to the EPS control system where appropriate assist torque is generated to assist the operator's steering effort. Another capability of the EPS system for easy adaptation to different steering feels via simple tuning is demonstrated by the experiments. It will be also verified that the EPS system can also improve damping and return performance of the steering wheel by control of the assist motor.

• Journal of Mechanical Science and Technology
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• 제15권6호
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• pp.720-726
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• 2001

This paper describes a vehicle driving-load estimation method for application to vehicle Intelligent Cruise Control (ICC). Vehicle driving-load consists of aerodynamic force, rolling resistance, and gravitational force due to road slope and is unknown disturbance in a vehicle dynamic model. The vehicle driving-load has been estimated from engine and wheel speed measurements using a vehicle dynamic model a least square method. The estimated driving-load has been used in the adaptation of throttle/brake control law. The performance of the control law has been investigated via both simulation and vehicle tests. The simulation and test results show that the proposed control law can provide satisfactory vehicle-to-vehicle distance control performance for various driving situations.

• 대한임베디드공학회논문지
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• 제7권5호
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• pp.267-275
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• 2012

In this paper, we present the model-based autonomic computing framework for a cyber-physical system which provides a self-management and a self-adaptation characteristics. A development process using this framework consists of two phases: a design phase in which a developer models faults, normal status constrains, and goals of the CPS, and an operational phase in which an autonomic computing engine operates monitor-analysis-plan-execute(MAPE) cycle for managed resources of the CPS. We design a hierachical architecture for autonomic computing engines and adopt the Model Reference Adaptive Control(MRAC) as a basic feedback loop model to separate goals and resource management. According to the GroundVehicle example, we demonstrate the effectiveness of the framework.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제3권3호
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• pp.285-307
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• 2009

This paper introduces DICE, a Domain-Independent text Classification Engine. DICE is robust, efficient, and domain-independent in terms of software and architecture. Each module of the system is clearly modularized and encapsulated for extensibility. The clear modular architecture allows for simple and continuous verification and facilitates changes in multiple cycles, even after its major development period is complete. Those who want to make use of DICE can easily implement their ideas on this test bed and optimize it for a particular domain by simply adjusting the configuration file. Unlike other publically available tool kits or development environments targeted at general purpose classification models, DICE specializes in text classification with a number of useful functions specific to it. This paper focuses on the ways to locate the optimal states of a practical text classification framework by using various adaptation methods provided by the system such as feature selection, lemmatization, and classification models.

• 한국정보처리학회논문지
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• 제7권5S호
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• pp.1609-1619
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• 2000

Workflow means the automation of a business process, in which documents, information or tasks are transferred among participants for business action according to a set of procedural rules, and workflow management system is a system which defines, creates and manages the execution of workflow running one or more workflow engines. In this research, necessity of standardizing current workflow systems is recognized, and problems such as interoperability of current systems, dynamic adaptation to changing business environment and lacking of assessment, management and auditing of business processes are analyzed so that the design and implementation of a workflow system is focused on to offer a solution to the problems. The system is designed and implemented to change dynamically on Run-Time the processes definition defined on Build-Time, and interoperability is enabled by developing workflow engine and related modules based on the WfMC specifications and APIs.