• 한국정보시스템학회지:정보시스템연구
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• 제31권4호
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• pp.47-73
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• 2022

Purpose The purpose of this study is to select the electronic architecture concept of the powertrain domain of the electronic platform to be applied to electric vehicles after 2025. Previously, the automotive electrical and electronic architecture was determined only by trend analysis, but the purpose was to determine the scenario based on the data and select it with clear evaluation indicators. Design/methodology/approach This study identified the function to be applied to the powertrain domain of next-generation electric vehicle, estimated the controller, defined the function feature list, organized the scenario candidates with the controller list and function feature list, and selected the final architecture scenario. Findings According to the research results, the powertrain domain of electric vehicles was selected as the architectural concept to apply the DCU (Domain Control Unit) and VCU (Vehicle Control Unit) integrated architecture to next-generation electric vehicles. Although it is disadvantageous or equivalent in terms of cost, it was found to be excellent in most indicators such as stability, security, and hardware demand.

• 제어로봇시스템학회논문지
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• 제16권3호
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• pp.245-248
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• 2010

Almost all of control schemes proposed so far have been designed in the continuous-time domain theoretically. Actual systems, however, have been implemented in the discrete-time domain since Micro Control Unit(MCU) and/or microprocessors have been used for the controllers. Thus, the overall system turned to be a sampled-data system, and generally speaking, the ultimate error cannot converge to zero in the actual system even though the proposed control algorithm showed the asymptotic stability in the continuous-time domain. In this paper, therefore, the ultimate error bound of a sampled data system with a short sampling period has been investigated. The ultimate error is shown to be related in the sampling period.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1994년도 FIFTH WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE SEOUL KOREA
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• pp.984-990
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• 1994

In this paper a new speech synthesis method in the time domain using mono-syllables is proposed. It is to overcome the degradation of the synthetic speech quality by the synthesis method in the frequency domain and to develop an algorithm in the time domain for the prosodic control. In particular when we use a method in a time domain with mono-syllable as a synthesis unit it will be the main issues which are to control th pitch period and to smooth the energy pattern. As a solution to the pitch control, a method using Lagrange interpolation is suggested. As a solution to the other problem, an algorithm which can control the amplitude envelop shape of mono-syllable is proposed. As the results of experiments it was possible to synthesize unlimited Korean speeches including the prosody control. Accoding to the MOS evaluation the quality and the naturality in them was improved to be a good level.

• 대한임베디드공학회논문지
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• 제8권3호
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• pp.129-136
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• 2013

In this paper, a motion control system based on 2-axis gimbal system is designed and implemented to drive a high speed and precision. The proposed system consists of the RS-422 interface, 2-axis gimbal platform, servo control unit integrated with a high speed DSP chip-set, servo amplifier unit, potentiometer sensor unit, and resolver sensor unit. The servo control unit using the high speed DSP firmware is designed to get a fast response without an overshoot with step input and a RMS error of low probability with ramp input. The servo amplifier unit using a voltage control is designed to resolve the zero-crossing distortion for precise motion. To verify the performance and stability of the implemented system, experiments are performed through a measurement of the time and frequency domain response in a laboratory environment by using a PXI(PCI eXtentions for Instrumentation).

• 한국통신학회논문지
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• 제24권9B호
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• pp.1767-1774
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• 1999

본 논문은 시간영역 상에서의 단음절 단위합성음을 사용한 다음절어 합성에 관한 연구이다. 특히, 파형 연접시 접속구간에서의 에너지 흐름의 형태를 제어하기 위한 연구이다. 이를 위하여 시간영역 상에서 추출한 운율요소 제어용 매개변수1)를 사용하여 제어하였으며, 음절간 파형 형태의 접속규칙을 도출하여 합성시킴으로써 에너지 흐름의 형태를 시간영역 상에서 제어시킨 결과를 제시하였다. 실험결과, 단음절 단위의 저장된 파형을 연접시킴으로서 발생되는 에너지 흐름의 불연속성을 제거할 수 있었으며, 또한 합성음의 음절 및 자연성이 향상되었다.

• 제어로봇시스템학회논문지
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• 제6권5호
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• pp.426-432
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• 2000

A novel mixed-integer linear programming model for the short-term scheduling of a sequential multipurpose batch plant is addressed. First, a time slot domain to each unit is introduced. By assigning each time slot to a product, we obtain the production sequence that minimizes makespan. For multiple-unit assignment problem where a few parallel units with the same function exist, production paths are defined for the distinction of the same stage with a different unit. As a second issue, the model adapted for sequence dependent changeover is presented. For a time slot of a unit, if a product is assigned to the time slot and a different product is assigned to the adjacent time slot, the changeover time considering this situation is included. The performance of the proposed models are illustrated through two examples.

• 한국과학교육학회지
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• 제16권1호
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• pp.97-102
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• 1996

Attitude is considered one of the most important influences on behavior and is defined as an enduring positive or negative feeling about some person, object or issues. The teaching strategies for affective domain are needed to develop the positive attiudes about environments. One of them is to faciliate the involvement of emotional feedback. The purpose of this study was to verify the effects of emotional feedback. Cognitional feedback was carried to control group but cognitional and emotional feedback were carried concurrently to experimental group. By the results, post test scores of experimental group were significantly higher than those of control group about four goals of Environmental Education, respectively. Therefore this strategy is effective to achieve goals of affective domain. Also, emotional feedback is important factor to raise the achievement of cognitive domain, too.

• 직업교육연구
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• 제29권3호
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• pp.107-132
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• 2010

이 연구의 목적은 초등학교 실과 5학년 '꽃과 채소 가꾸기' 단원에 프로젝트법을 적용한 집단과 전통적인 학습법을 적용한 집단을 비교하여 학업성취도에 미치는 효과를 알아보는데 있다. 이 연구의 목적을 달성하기 위하여 경기도 S초등학교 5학년 실험집단30명과 통제집단33명을 연구 대상으로 실험집단과 통제집단으로 선정하였다. 실험집단에 적용한 프로젝트법은 정성봉(1999)이 실과 가꾸기 단원에 적용한 모형을 일부 수정하여 사용하였고, 통제집단에는 전통적인 학습을 실시하였다. 실험 처치는 10차시에 걸쳐 실시하였으며, 실험 설계의 방법으로는 준실험 설계 중 이질집단 사후검사 설계 모형이 적용되었다. 자료는 SPSSWIN(ver 12.0.1) 한글 프로그램을 사용하였으며, 신뢰성 검증과 t검증 등을 실시하여 유의도 수준 5%(p<.05)에서 분석하였다. 이 연구의 결과를 통해 실과 '꽃과 채소 가꾸기' 단원은 전통적 학습법 보다 프로젝트법이 학습자의 인지적 영역의 학업성취도의 효과를 종합하여 검증한 결과 지식은 효과가 없었으며, 지적기능과 지적능력에서는 효과가 있는 것으로 검증되었다. 기능적 영역의 학업성취도의 효과를 종합하여 검증한 결과 식물 심기를 측정하는 요소기능은 차이가 없었으나 식물 관리하기를 측정하는 기본기능과 식물 가꾸기 능력을 종합적으로 측정하는 통합기능의 하위변인에서는 차이가 있는 것으로 분석되었다. 정의적 영역의 학업성취도의 효과를 종합하여 검증한 결과 관심은 차이가 없었으나 수용, 가치, 신념, 행동화의 하위 변인에서는 차이가 있는 것으로 분석되었다. 이 연구의 결과를 통해 실과 '꽃과 채소 가꾸기' 단원은 전통적 학습법 보다 프로젝트법이 학습자의 인지적, 기능적, 정의적 영역의 학업성취도가 높게 나타났다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.565-568
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• 1996

In this paper, a solution method is proposed to calculate the optimum solution to discrete optimal H$_{.inf}$ control problem for feedback of linear time-invariant system states and disturbance variable. From the results of this study, condition of existence and uniqueness of its solution is that transfer matrix of controlled variable to input variable is left invertible and has no invariant zeros on the unit circle of the z-domain as well as extra geometric conditions given in this paper. Through a numerical example, the noniterative solution method proposed in this paper is illustrated.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.167.4-167
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• 2001

Accurate mathematical models of spacecraft components are an essential of spacecraft attitude control system design, analysis and simulation. Gyro is one of the most important spacecraft components used for attitude propagation and control. Gyro errors may seriously degrade the accuracy of the calculated spacecraft angular rate and of attitude estimates due to inherent drift and bias errors. In this paper, a detailed mathematical model of gyro containing the relationships for predicting spacecraft angular rate and disturbances is proposed. Stochastic model describing random drift behavior is discussed in frequency domain and time domain. In order to illustrate this approach, we analyze the behavior for Litton´s Space Inertial Reference Uint(SIRU).