• 전자공학회논문지 IE
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• 제47권4호
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• pp.34-38
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• 2010

본 논문에서 DCU는 기지국 전력증폭기의 성능을 안정적으로 유지하여 기지국 전체의 성능과 안정성 유지에 기여한다. 제안된 DCU는 전력증폭기에 공급되는 전력을 제어하며 실험에 사용한 앰프는 정격 입력이 10dBm일 때 정격 출력은 47.8dBm 이다. 성능의 비교는 DCU를 적용 했을 때와 미적용 했을 때를 비교하였고 연구결과 DCU가 IMD의 열화 경계에서 안정적으로 잘 동작 하였으며 전력증폭기가 매우 안정적으로 동작했다. DCU 없이 입력을 정격 보다 2dB 올렸을 때 IMD는 3~4dB 정도 나빠짐을 볼 수 있었다. 측정 결과를 보면 DSP를 이용한 제어가 유효하다는 것을 입증한다.

• 디지털융복합연구
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• 제6권1호
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• pp.35-41
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• 2008

The digital economic environment of next generation, which digital high-technology industry appears to be the economic center of the high degree of industry structure, is expected to be developed as the existing traditional industry is merged with high tech digital one. The developing system of contents policy for digital industry means the policy and vision, and strategic structure which get the mechanism of contents industry structure to work. The promotion organization of digital contents policy is requested to secure the framework of digital contents industry based on cluster, the infra framework of digital infra culture, the infra framework of industry-academic cooperation, and the overall digital contents based on motive policy for the vitality of the youth. The application of digital contents policy may lead to establish the framework of the growth for the every unit of industry with the cluster oriented system.

• 한국화재소방학회논문지
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• 제29권6호
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• pp.98-108
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• 2015

자연 재해 또는 대형 인적 재난 현장과 같은 특수재난현장의 지휘본부에서는 소방관의 안전과 효과적인 지휘 통제를 위한 통합 지휘시스템은 매우 중요하다. 통합지휘시스템은 특수재난현장의 온도, 습도, 이산화탄소 등의 환경 정보와 현장 상황을 파악할 수 있는 영상 정보 및 소방관의 맥박, 공기통 잔량 등의 개인 신체 정보를 필요로 한다. 수집된 정보들은 Analog to Digital Converter (ADC) 칩을 거쳐 디지털 신호로 변경되고 Micro Controller Unit (MCU)가 직렬 통신 방식인 Serial Peripheral Interface (SPI) 통신 방식으로 이용하여 송신 보드로 디지털 신호를 전송한다. 송신 보드에 저장된 디지털 신호는 Radio Frequence (RF) 송신기를 이용하여 통합지휘시스템으로 전송된다. 자이로센서 및 관성센서를 이용하여 건물 내부에 있는 진압대원의 위치를 확인한다. 수집된 정보는 소방관의 안전과 효과적인 지휘를 할 수있는 통합 지휘 시스템을 위한 각종 정보로 활용된다. 본 연구는 무선 전송 기술, 실내 측위기술 및 통합지휘시스템에 전송 된 정보를 이용한 의사결정 지원 통합지휘시스템 대하여 이론적 및 실험적으로 연구한다.

• 인터넷정보학회논문지
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• 제14권3호
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• pp.1-13
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• 2013

최근 등장한 다양한 플랫폼 기반의 스마트폰과 iPad와 같은 미디어 디바이스의 등장은 전세계 소비자의 관심을 불러일으켰다. 이러한 관심은 종이책의 디지털화를 가져오게 되었고 국내외 전자출판물 산업의 가파른 성장을 가져왔다. 하지만 다양한 디바이스와 콘텐츠들이 생겨나면서 호환성 문제가 대두되었고 전자출판물과 관련한 콘텐츠의 교환 및 공유를 위한 표준화의 필요성과 수요를 만들어 냈다. 본 연구는 전자출판물 표준화와 관계된 산 학 연 관 이해관계자 16명의 의견 수렴을 통해 향후 전자출판분야의 콘텐츠 및 유통, 디바이스, 표준화, 기술적 보호조치, 저해요인 등에 대한 미래에 예측되는 변화들을 살펴보고 이를 기반으로 추후 표준 개발을 위한 영역 및 요소를 도출해보고자 한다.

• 대한치과교정학회지
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• 제46권3호
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• pp.171-179
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• 2016

Objective: The primary aim of the study was to generate new prediction equations for the estimation of maxillary and mandibular canine and premolar widths based on mandibular incisors and first permanent molar widths. Methods: A total of 2,340 calculations (768 based on the sum of mandibular incisor and first permanent molar widths, and 1,572 based on the maxillary and mandibular canine and premolar widths) were performed, and a digital stereomicroscope was used to derive the the digital models and measurements. Mesiodistal widths of maxillary and mandibular teeth were measured via scanned digital models. Results: There was a strong positive correlation between the estimation of maxillary (r = 0.85994, $r^2=0.7395$) and mandibular (r = 0.8708, $r^2=0.7582$) canine and premolar widths. The intraclass correlation coefficients were statistically significant, and the coefficients were in the strong correlation range, with an average of 0.9. Linear regression analysis was used to establish prediction equations. Prediction equations were developed to estimate maxillary arches based on $Y=15.746+0.602{\times}sum$ of mandibular incisors and mandibular first permanent molar widths (sum of mandibular incisors [SMI] + molars), $Y=18.224+0.540{\times}(SMI+molars)$, and $Y=16.186+0.586{\times}(SMI+molars)$ for both genders, and to estimate mandibular arches the parameters used were $Y=16.391+0.564{\times}(SMI+molars)$, $Y=14.444+0.609{\times}(SMI+molars)$, and $Y=19.915+0.481{\times}(SMI+molars)$. Conclusions: These formulas will be helpful for orthodontic diagnosis and clinical treatment planning during the mixed dentition stage.

• 소음진동
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• 제6권2호
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• pp.205-214
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• 1996

Active noise control(ANC) requires the full capability of a modern digital signal processing module. This paper describes the digital signal processing unit which is designed for ANC of noise fields in passenger car. System hardware is designed to allow software controlled versatility as well as fully qutomatic operation. The developed system is provided with the ability to be self-operated except the case of upload/download of data and program between the personal computer and the system memory. Experimental results are presented to demonstrate ANC performance of noise fields in lightly damped enclosure and passenger car.

• 한국분말재료학회지
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• 제19권4호
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• pp.297-303
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• 2012

In this study, voltammetry system for realizing high sensitivity nano-labeled sensor of detecting heavy metals was designed, and optimal system operating conditions were determined. High precision digital to analog converter (DAC) circuit was designed to control applied unit voltage at working electrode and analog to digital converter (ADC) circuit was designed to measure the current range of $0.1{\sim}1000{\mu}A$ at counter electrode. Main control unit (MCU) circuit for controlling voltammetry system with 150 MHz clock speed, main memory circuit for the mathematical operation processing of the measured current value and independent power circuit for analog/digital circuit parts to reduce various noise were designed. From result of voltammetry system operation, oxidation current peaks which are proportional to the concentrations of Zn, Cd and Pb ions were found at each oxidation potential with high precision.

• Journal of Power Electronics
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• 제6권2호
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• pp.178-185
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• 2006

Recently, the demand for the development of high quality and high-speed laser printers and efficient power utilization has required. Among complicated electro-mechanic devices in laser printers, the toner-fusing unit consumes above 90[%] of all electrical energy needed for printing devices. Therefore, the development of a more effective energy-saving toner fusing process becomes a significant task in great demand. Generally, there are several ways to implement a fusing unit. Among them this paper presents a new induction heating method. The proposed induction heating method enables the increase of coupling coefficient between heating coil and heat roller which also increases total energy transfer efficiency. Therefore, the proposed IH (Induction Heating) inverter system provides very fast W.U.T. (Warm UP Time) as well as higher efficiency. Through experimental results, the proposed control system is verified.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.1076-1079
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• 1993

A fuzzy digital controller is combined an autopilot system for compensating the cross coupling effect of the induced roll due to the dynamic characteristic of three fin torpedo. However the utilization of fuzzy chip has many interfacing problems with typical microprocessors of the guidance and control unit. Since a fuzzy digital controller on a microprocessor uses a finite word length A/D converters arul D/A converters, ADC and DAC may generate nonlinear effects such as deadband and limit cycle phenomena. In this paper, the robustness of fuzzy digital controller is tested with ADC a finite word length.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.744-749
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• 2005

The train configuration is based on one unit like basic 4 cars to multiple unit operation. Each unit has unique node such as train formation number. Some equipments(TC, CC) of TCMS are connected to the master TC through the LonWorks network. When the train is consist of multiple unit, TCMS has to implement quick network for data communication overall train. But a variable time delay is generated when it is performed communication with point to point type using train formation number. In this paper we propose new method to know the node information of adjacent unit. that is to add digital input signals notifying cab direction at any cabin. Also, we provide the optimized screen design that all collected information via network is displayed by each unit.