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A Construction Method of Expert Systems in an Integrated Environment

  • Chen, Hui
    • Proceedings of the Korea Inteligent Information System Society Conference
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    • 2001.01a
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    • pp.211-218
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    • 2001
  • This paper introduces a method of constructing expert systems in an integrated environment for automatic software design. This integrated environment may be applicable from top-level system architecture design, data flow diagram design down to flow chart and coding. The system is integrated with three CASE tools, FSD (Functional Structure Diagram), DFD (Data Flow Diagram) and structured chart PAD (Problem Analysis Diagram), and respective expert systems with automatic design capability by reusing past design. The construction way of these expert systems is based on systematic acquisition of design knowledge stemmed from a systematic design work process of well-matured developers. The design knowledge is automatically acquired from respective documents and stored in the respective knowledge bases. By reusing it, a similar software system may be designed automatically. In order to develop these expert systems in a short period, these design knowledge is expressed by the unified frame structure, functions of th expert system units are partitioned mono-functions and then standardized components. As a result, the design cost of an expert system can be reduced to standard work procedures. Another feature of this paper is to introduce the integrated environment for automatic software design. This system features an essentially zero start-up cost for automatic design resulting in substantial saving of design man-hours in the resulting in substantial saving of design man-hours in the design life cycle, and the expected increase in software productivity after enough design experiences are accumulated.

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Integrated Current-Mode DC-DC Buck Converter with Low-Power Control Circuit

  • Jeong, Hye-Im;Lee, Chan-Soo;Kim, Nam-Soo
    • Transactions on Electrical and Electronic Materials
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    • v.14 no.5
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    • pp.235-241
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    • 2013
  • A low power CMOS control circuit is applied in an integrated DC-DC buck converter. The integrated converter is composed of a feedback control circuit and power block with 0.35 μm CMOS process. A current-sensing circuit is integrated with the sense-FET method in the control circuit. In the current-sensing circuit, a current-mirror is used for a voltage follower in order to reduce power consumption with a smaller chip-size. The N-channel MOS acts as a switching device in the current-sensing circuit where the sensing FET is in parallel with the power MOSFET. The amplifier and comparator are designed to obtain a high gain and a fast transient time. The converter offers well-controlled output and accurately sensed inductor current. Simulation work shows that the current-sensing circuit is operated with an accuracy of higher than 90% and the transient time of the error amplifier is controlled within 75μsec. The sensing current is in the range of a few hundred μA at a frequency of 0.6~2 MHz and an input voltage of 3~5 V. The output voltage is obtained as expected with the ripple ratio within 1%.

Integrated System for Autonomous Proximity Operations and Docking

  • Lee, Dae-Ro;Pernicka, Henry
    • International Journal of Aeronautical and Space Sciences
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    • v.12 no.1
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    • pp.43-56
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    • 2011
  • An integrated system composed of guidance, navigation and control (GNC) system for autonomous proximity operations and the docking of two spacecraft was developed. The position maneuvers were determined through the integration of the state-dependent Riccati equation formulated from nonlinear relative motion dynamics and relative navigation using rendezvous laser vision (Lidar) and a vision sensor system. In the vision sensor system, a switch between sensors was made along the approach phase in order to provide continuously effective navigation. As an extension of the rendezvous laser vision system, an automated terminal guidance scheme based on the Clohessy-Wiltshire state transition matrix was used to formulate a "V-bar hopping approach" reference trajectory. A proximity operations strategy was then adapted from the approach strategy used with the automated transfer vehicle. The attitude maneuvers, determined from a linear quadratic Gaussian-type control including quaternion based attitude estimation using star trackers or a vision sensor system, provided precise attitude control and robustness under uncertainties in the moments of inertia and external disturbances. These functions were then integrated into an autonomous GNC system that can perform proximity operations and meet all conditions for successful docking. A six-degree of freedom simulation was used to demonstrate the effectiveness of the integrated system.

Development of Integrated Slopes Database System for Real-Time Global Web Service (광역 실시간 웹 서비스를 위한 통합 사면 데이터베이스 시스템 개발)

  • Lee, Kyu-Woong;Tscha, Yeong-Whan;Lee, Seung-Ho
    • The Journal of the Korea Contents Association
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    • v.10 no.6
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    • pp.471-479
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    • 2010
  • The main contribution of this paper is to propose the integrated database schema from several research projects included in "The Next Generation New Technology for Rock-falling and Landsliding Project". Furthermore this paper describes the development of integrated standard database system for the slopes databases. We also develop and implement the global real time web service system in order to provide one-stop data service for the slopes. In this paper, the new integrated database paradigm for rock-fall and landsliding data is designed and proposed and also data management system is developed based on the global web service system.

Integrated Design of Feed Drive Systems Using Discrete 2-D.O.F. Controllers (II) -Formulation and Synthesis of Integrated Design- (이산형 2자유도 제어기를 이용한 이송계의 통합설계 (II) -통합설계의 정식화와 해석-)

  • Kim, Min-Seok;Chung, Sung-Chong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.7
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    • pp.1038-1046
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    • 2004
  • In order to acquire high-speed and high-precision performances in servomechanisms, an integrated design method have been proposed. Based on strict mathematical modeling and analysis of system performance according to design and operating parameters, a nonlinear constrained optimization problem including the relevant subsystem parameters of the servomechanism is formulated. Optimum design results of mechanical and electrical parameters are obtained according to the design parameters specified by designers through the integrated design processes. Motors are optimally selected from the servo motor database. Both the geometric errors referring to Abbe offset and the contour errors are minimized while required constraints such as stability conditions and saturated conditions are satisfied. This design methodology both offers the improved possibility to evaluate and optimize the dynamic motion performance of the servomechanism and improves the quality of the design process to achieve the required performance for high-speed/precision servomechanisms.

Study on Implementation Scheme for Integrated PSD Control System of Seoul Metro (서울메트로 PSD 통합관제시스템 구축방안에 대한 연구)

  • Kim, Yong-Hyeop;Hyun, Yong-Sub;Ryoo, Ho-Joong;Kim, Jin-Su
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.1551-1559
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    • 2007
  • Seoul Metro has been constructing the screen doors on the platforms to provide safe and comfort environments. The screen doors of each station are configured so that they can be operated in automatic mode in connection with ATC/ATO through the integrated control panel in the station control room and in manual mode through the control panel of the station control room and crew control panel. These systems have been implemented with different data communication protocols between systems, HMI configuration, and so on due to ordering processes, implementation time and diverse suppliers, and manufactured to be operated within single station. Seoul Metro has been planning to implement the integrated control system to secure seamless train operation and safety and to have a fast response system against emergency situations such as PSD failure and fire, by implementing the system that is able to collectively manage, monitor and control the operation status and equipment conditions of PSD on to the integrated control center. This paper has studied a scheme to reduce the budget for the future facility constructions by standardizing the data format for data communication with the integrated station control panel and using the open standard protocols, in order to secure consistency of operation, system expansion and maintenance with unified and standardized control items.

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Design Considerations for Low Voltage Claw Pole Type Integrated Starter Generator (ISG) Systems

  • Lee, Geun-Ho;Choi, Geo-Seung;Choi, Woong-Chul
    • Journal of Power Electronics
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    • v.11 no.4
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    • pp.527-532
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    • 2011
  • Due to the need for improved fuel consumption and the trend towards increasing the electrical content in automobiles, integrated starter generator (ISG) systems are being considered by the automotive industry. In this paper, in order to change the conventional generator of a vehicle, a belt driven integrated starter generator is considered. The overall ISG system, the design considerations for the claw pole type AC electric machine and a low voltage very high current power stage implementation are discussed. Test data on the low voltage claw pole type machine is presented, and a large current voltage source DC/AC inverter suitable for low voltage integrated starter generator operation is also presented. A metal based PCB (Printed Circuit Board) power unit to attach the 4-parallel MOS-FETs is used to achieve extremely high current capability. Furthermore, issues related to the torque assistance during vehicle acceleration and the generation/regeneration characteristics are discussed. A prototype with the capability of up to 1000 A and 27 V is designed and built to validate the kilo-amp inverter.

Integrated Chassis Control System of a Rear In-wheel Motor Vehicle (후륜 구동 인휠 전기 자동차의 구동 및 현가 통합제어시스템)

  • Kim, Hyundong;Choi, Gyoojae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.4
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    • pp.439-446
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    • 2016
  • An in-wheel motor vehicle is a type of car that is equipped with an electric motor for each wheel. It is possible to acquire vehicle stability through a seperate driving torque control per wheel, since it directly generates the driving torque via the wheel motors. However, the vehicle ride comfort and road holding performance worsen depending on the increase of the wheel weights. In order to compensate for the impaired performance, an integrated chassis control system of the rear in-wheel motor vehicle is proposed. The proposed integrated chassis control system is composed of a driving torque control system, a semi-active suspension system, and an ESC system. According to the vehicle dynamic simulation of an in-wheel motor vehicle equipped with the integrated chassis control system, it is found that the system can improve the driving stability, ride comfort, and driving efficiency of the in-wheel motor vehicle.

Development of 3D CSGNSS/DR Integrated System for Precise Ground-Vehicle Trajectory Estimation (고정밀 차량 궤적 추정을 위한 3 차원 CSGNSS/DR 융합 시스템 개발)

  • Yoo, Sang-Hoon;Lim, Jeong-Min;Jeon, Jong-Hwa;Sung, Tae-Kyung
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.11
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    • pp.967-976
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    • 2016
  • This paper presents a 3D carrier-smoothed GNSS/DR (Global Navigation Satellite System/Dead Reckoning) integrated system for precise ground-vehicle trajectory estimation. For precise DR navigation on sloping roads, the AHRS (Attitude Heading Reference System) methodology is employed. By combining the integrated carrier phase of GNSS and DR sensor measurements, a vehicle trajectory with an accuracy of less than 20cm is obtained even when cycle slip or change of visibility occur. In order to supplement the weak GNSS environment with DR successfully, the DR sensor is precisely compensated for using GNSS Doppler measurements when GNSS visibility is good. By integrating a multi-GNSS receiver with low-cost IMU, a precise 3D navigation system for land vehicles is proposed in this paper. For real-time implementation, a decoupled Kalman filter is employed in the integrated system. Through field experiments, the performance of the proposed system is verified in various road environments, including sloping roads, good-visibility areas, high multi-path areas, and under-ground parking areas.

Intergenerational Programs and Spaces for the Improvement of Intergenerational Interactions in Integrated Welfare Facilities in Gyeonggi Province, South Korea (세대교류 활성화를 위한 세대통합 프로그램 및 세대교류 공간에 관한 연구 - 경기도 복지관을 중심으로)

  • Park, Hae-Sun;Ahn, Taeyoon
    • Journal of The Korea Institute of Healthcare Architecture
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    • v.18 no.2
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    • pp.65-76
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    • 2012
  • South Korea's rapid ageing and the fast increase of nuclear families have led to the social isolation of the elderly and generational conflicts. In order to solve these social problems, this study explores the ways in which different generations can communicate and interact more actively. We surveyed 110 social workers who run generation-integrated programs at community centers in Gyeonggi province, and also examined the spatial design of the four age-integrated community centers and analysed its effect on the intergenerational exchange. We propose several suggestions for intergenerational exchange programs and effective space planning to facilitate intergenerational interactions in multi-generational community centers. To develop intergenerational interactions and keep their constant relationship, the users of community centers should be the core of generation-integrated programs which can facilitate the intergenerational exchange and interactions.