• 한국정보통신학회논문지
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• 제23권12호
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• pp.1650-1658
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• 2019

최근 IoT 기기 및 플랫폼들의 발전 및 확장과 더불어 IoT 관련 기기 내 연산 성능도 지속해서 향상하고 있다. 그러나 기기 향상과는 별개로 IoT 기기, 특히 소형 단일 보드 컴퓨터의 제한적인 크기 및 연산 자원은 해당 기기 내 통신 시스템 구현 설계를 위한 중요 고려사항 중 하나이다. 현재 다양한 무선 통신 시스템을 활용할 수 있게끔 소프트웨어 정의 라디오 (SDR) 기술을 IoT 기기에 적용 시 소형 단일 보드 컴퓨터의 하드웨어 제한 사항으로 인한 열화 가능성으로 인하여 실제 시스템의 원활한 적용을 위해 해당 컴퓨터 성능에 대한 분석 및 조사가 필요하다. 본 논문에서는 소형 단일 보드 컴퓨터 내 SDR 적용 스펙트럼 센싱 시스템 디자인을 위한 시스템 연산 분석 및 실험을 진행한다. 먼저 단일 보드 컴퓨터를 위한 SDR 기반 스펙트럼 센싱 시스템을 설계하고 시스템 성능에 영향을 줄 수 있는 다양한 요소를 실험을 통해 조사하며. 이를 통한 중요 고려사항 및 디자인 가이드 절차를 도출한다.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2009년도 학술대회
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• pp.851-854
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• 2009

본 연구는 현재 존재하는 중극장 이상의 프로시니엄 혹은 다용도 무대의 실측과 그 data의 디지털화, 그리고 디지털화 된 무대에서 가상으로 디자인을 산출함으로 공연에 필요한 디자인 예산과 조명 시스템을 예측하고, 더 발전시켜 조명과 음향을 모두 통제하는 것을 목표로 한다. 이를 위하여 배경 기술 조사와 국내외 관련 기술에 관한 조사를 선행하였다. 이를 바탕으로 하드웨어적 소프 하드웨어적 기술을 연구하였다.

• 한국통신학회논문지
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• 제10권5호
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• pp.258-265
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• 1985

이 論文은 SISO 離散時間 基準모델 適應制御시스템에 대한 設計問題를 다루었다. 基準모델과 未知시스템의 入·出力端에 狀態變數필터를 도입하므로서, 可用信號들로 구성된 아주 간단한 適應시스템을 구성할 수 있다. 未知시스템의 相對次數가 1 또는 2 이상인 경우의 設計法은 多數 발표되었으나, 構造가 매우 복잡하거나 設計理論이 일반화하지 못하였다. 본 論文에서는 相對次數가 2이상인 경우에 간단한 線型필터를 도입하므로서 適應構造를 간단히 구성할 수 있음을 證明하였다.

• 한국지능시스템학회논문지
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• 제18권1호
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• pp.109-115
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• 2008

무인자동차에 관한 연구가 활성화되면서 무인 주차 또한 중요한 과제로 대두되고 있다. 본 논문에서는 무인차랑을 위한 주차 편의 시스템 설계를 위하여 퍼지논리시스템에 의한 주차 알고리즘 설계를 제안하고자 한다. 기존의 논문들이 제시한 장단점을 분석하여 새로운 단일 입력을 가지는 퍼지논리시스템을 통한 주차 알고리즘을 설계하고, 시뮬레이션을 통하여 그 효용성을 확인하고자 한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.190-190
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• 2000

This paper presents a multirate state feedback control (MRSFC) method for systems sensitive to disturbance and noise based on the multirate estimator design using the current estimator. MRSFC updates the controller output slower than the measurement sampling frequency of system output by a lifting factor R=T$\sub$c//T$\sub$s/. The closed-loop MRSFC system is less sensitive to disturbance and noise due to filtering effect than the conventional single-rate control system. The multirate estimator gain is obtained from solving a conventional pole placement problem such that MRSFC has the same spectrum of eigenvalues in the s-plane as the single-rate control. We applied the proposed multirate state feedback controller to a galvanometer servo system. Simulation and experimental results show that settling and tracking performances are improved compared with a conventional single-rate pole placement control (PPC).

• International Journal of Automotive Technology
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• 제6권3호
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• pp.235-242
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• 2005

This study introduces the Reliability-Based Design Optimization (RBDO) to enhance the kinematic and compliance (K & C) characteristics of automotive suspension system. In previous studies, the deterministic optimization has been performed to enhance the K & C characteristics. Unfortunately, uncertainties in the real world have not been considered in the deterministic optimization. In the design of suspension system, design variables with the uncertainties, such as the bushing stiffness, have a great influence on the variation of the suspension performances. There is a need to quantify these uncertainties and to apply the RBDO to obtain the design, satisfying the target reliability level. In this research, design variables including uncertainties are dealt as random variables and reliability of the suspension performances, which are related the K & C characteristics, are quantified and the RBDO is performed. The RBD-optimum is compared with the deterministic optimum to verify the enhancement in reliability. Thus, the reliability of the suspension performances is estimated and the RBD-optimum, satisfying the target reliability level, is determined.

• 한국정밀공학회지
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• 제13권9호
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• pp.114-129
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• 1996

This paper describes the whole development phase for the underwater vehicle actuating system with high hydroload torque disturbance. This includes requirement analysis, system modeling, control algorithm design, real time implementation, test and performance evaluations. As for driving control algorithms, fuzzy logic, variable structure and PD(Proportional-Differential) algorithm were designed and implemented on board controller using a single chip microprocessor. Intel 8797. And test and performance evaluation is carried out both single test and wystem integration test. We could confirm the basic performance of actuating system through the single test and gereral developing work of any actuating systems was finished with a single performance test of actuating system without system integration test. But, we suggested that system integration test be needed. System integration test is carried out using G/C HILS(Guidance and Control Hardware-In-the -Loop Simulation) which is constituted flight motion simulator, load simulator, real time host computer and the related subsystems such as inertial navigation system, power supply system and Guidance and Control Computer etc.. The most important practical contribution of this paper is that full system characteristics such as minimal control effort, enhancement of guidance and autopilot performance by the actuating system using G/C HILS technique are investigated. Through full running G/C HILS, in spite of the passing to single tests, some control algorithm resulted in failure as to stability of full system and system time frame.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1995년도 춘계공동학술대회논문집; 전남대학교; 28-29 Apr. 1995
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• pp.534-544
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• 1995

Many electronic products employ menu-driven interfaces for user-system dialogue. Unlike the software user interfaces, a small single-line display, such as a Liquid Crystal Display, is typically used to present menu items. Since the display can show only a single menu item at a time, more serious navigation problems are expected with single-line display menus(SDM). This study attempts to provide a set of unique guidelines for the design of the SDM based on empirical results. A human factors experiment was conducted to examine the effects of four design variables: menu structure, user experience, navigation aid, and number of targets. The usability of design alternatives was measured quantitatively in four different aspects, which were speed, accuracy, inefficiency of navigation, and subjective user preference. The analysis of variance was used to test the statistical effects of the design variables and their interaction effects. A set of design guidelines was drawn from the results which can be applied to the design of human-system interfaces of a wide variety of electronic consumer products using such displays. Since more generalized guidelines could be provided by constructing prediction models based on the empirical data, some powerful performance models are also required for the SDM. As a preliminary study, a survey was done on the performance models for ordinary computer menus.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.909-912
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• 2005

According to miniaturization trend of rehabilitation medical equipment such as hearing aid, study to replace previous complex system with semiconductor SOC (System-on-Chip) chip becomes lively. In this study, after investigating of existent hearing aid performance in circuit design approach, low electric power consuming, single power supply (1.4V battery) CMOSS OP AMP was designed. Analog circuit design tools such as Hspice and Cadence were used for circuit simulation and implementing layout design. This study shows technical methods particularly for layout design. The work is done in pmos and nmos active element layout design in addition to passive element design such as resister, capacitor and inductor.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계학술대회논문집
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• pp.310-313
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• 2005

This paper is concerned with the active vibration control of beam equipped with piezoceramic sensors and actuators. The single-input and single-output positive position feedback controller is considered as an active vibration controller for the beam. The proposed single-input and single-output positive position feedback controller can cope with many modes of interest by summing each positive position feedback controller designed for each mode. In this paper, theoretical formulation is first explained in detail. We discuss how to design the single-input and single-output positive position feedback controller for a target structure by considering Euler-Bemoulli beam. It is found that the theories developed in this study are capable of predicting the control system characteristics and its performance.