• 항공우주시스템공학회지
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• 제7권3호
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• pp.65-69
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• 2013

Avionics system designed for the 200 kg-class tiltrotor UAV has been developed. Avionics system for the UAV is the reconstruct system and can be programmed automation controller. This paper focuses on the design aspects of the hardware and presents the ground and flight test results. The hardware aspects of the avionics system include details about the hardware configurations for the interfaces with the Digital Flight Control Computer, sensors and Line-replaceable unit modifications.

• Journal of information and communication convergence engineering
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• 제18권3호
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• pp.183-187
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• 2020

The general Wi-Fi network connection structure is that a number of IoT (Internet of Things) sensor nodes are directly connected to one AP (Access Point) node. In this structure, the range of the network that can be established within the specified specifications such as the range of signal strength (RSSI) to which the AP node can connect and the maximum connection capacity is limited. To overcome these limitations, multiple middleware bridge technologies for dynamic scalability and load balancing were studied. However, these network expansion technologies have difficulties in terms of the rules and conditions of AP nodes installed during the initial network deployment phase In this paper, an intelligent edge computing IoT device is developed for constructing an intelligent autonomous cluster edge computing network and applying it to real-time road danger context aware and notification system through an intelligent risk situation recognition algorithm.

• 정보와 통신
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• 제15권7호
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• pp.169-179
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• 1998

본 논문에서는 현재 연구 개발되고 있는 Fiber-to-the-curb / Very high-rate digital subscriber line(FTTC/VDSL) 시스템의 DAVIC 표준 가입자 전송 기술인 51.84 Mb/s 16-CAP (Carrierless AM/PM) 전송시스템 (downstream)과 1.62 Mb/s QPSK burst-mode TDMA 전송시스템 (upstream)및, 타이밍 복원회로 등의 동작 원리 및 구조를 간략하게 기술하였다. 본 논문은 FTTC/VDSL 전송시스템 개발을 위하여 전체시스템이 운영될 환경, 즉 채널에 대하여 기술한 후, 주어진 채널에 적합한 down-stream전송시스템 알고리즘 및 구조를 설명하였으며, 타이밍 복원 시스템을 기술하였다. FTTC/VDSL시스템은 네트워크의 한 개의 송수신부가 가입자 댁내의 여러 개의 set-top box와 데이터를 주고받는 점 대 다점 (point-to-multipoint) 구조로 이루어져 있으며, 따라서 역 방향 (upstream) 채널 데이터 전송을 위한 QPSK 전송시스템은 네트워크쪽의 QPSK 수신부가 가입자 댁내의 여러개의 QPSK 송신부를 서비스할 수 있게끔 시분할 다중접속 방식인 burst-mode TDMA전송방식으로 구현되었다. FTTC/VDSL 전송시스템은 DAVIC의 시스템 성능 요구조건을 만족하게 설계되었으며, 모든 기능은 디지털로 구현되었고 칩 구현을 위하여 각 기능의 VLSI 시스템 파라메타 들을 추출하고 성능 시험을 실시하였다.

• 음성과학
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• 제6권
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• pp.119-143
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• 1999

In this paper, the development of English Intonational Phonology is introduced. The existing representation systems of intonation are largely divided into the American structuralist school and the British school, which describe intonation by means of 'levels' and 'configurations' respectively. Both representation systems have some theory-internal problems, however. As for the American school, there is no way to represent pitches much lower than the reference line, while the system of intonation in the British school is limited in that intonation is described in a phonetic impressionistic way rather than from a phonological perspective. Intonational Phonology, a real phonological approach, which has grown out of the basic assumptions of autosegmental-metrical(AM) theory has been suggested by Pierrehumbert(1980). In her approach, an intonational tune is made up of one or more pitch accents, followed by an obligatory phrase accent and an obligatory boundary tone, and interestingly 22 combinations are possible. Intonational Phonology has been revised from Beckman & Pierrehumbert(1986) in developing ToBI(Tones & Break Indices), a proposed standard for labelling prosodic features of digital speech databases in English.

• 항공우주시스템공학회지
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• 제2권3호
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• pp.33-39
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• 2008

VDL Mode 2 is one of air-to-ground VHF digital data link technologies. The VDL Mode 2 system is designed to be an air-to-ground subnetwork of the Aeronautical Telecommunication Network (ATN) using the AM(R)S band and it is organized according to the Open System Interconnection (OSI) model (defined by ISO). It can be used in ATS Applications especially for ATC communication such as CPDLC and ADS as well. And It is expected VDL Mode 2 replaces ACARS(Aircraft Communications Addressing and Reporting System) which has broadly been used for over 20 years. This paper presents the result of design of operational test equipments for the validation of VDL Mode 2 system under development in KARI.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 C
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• pp.1959-1961
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• 2002

Requirements for high-efficiency equipment for energy saving are rapidly increasing recently keeping pace with development of digital and semiconductor technology. Accordingly, there are many changes and development in ballast. Ballast currently in use are Magnetic ballast (Coiled Type) and Electronic ballast. Electronic ballast produces incredible energy saving effect, but falls short of confidence instead. In addition, use at higher frequency through switching device creates Electromagnetic Interference (EMI) and high frequency. EMI creates low quality of equipment, damage in facilities and low productivity by leading miss operation of equipment, and interferes with surrounding machines. In this analysis I am going to examine characteristics of EMI on the Electronic ballast of FLR32SS one type pursuant to annex 3 of Electric Goods Technology Standard, and counter technology.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.379-380
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• 2006

As a result of growth sensor-enabled mobile devices such as PDA, cellular phone and other computing devices, in recent years, users can utilize the diverse digital contents everywhere and anytime. However, the interfaces of mobile applications are often unnatural due to limited resources and miniaturized input/output. Especially, users may feel this problem in some applications such as the mobile game. Therefore, Novel interaction forms have been developed in order to complement the poor user interface of the mobile device and to increase the interest for the mobile game. In this paper, we describe the demonstration of the gesture and posture input supported by an accelerometer. The application example we created are AM-Fishing game on the mobile device that employs the accelerometer as the main interaction modality. The demos show the usability for the gesture and posture interaction.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.833-836
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• 2007

A low power and small area source driver using LTPS TFTs is proposed for mobile applications. This source driver adopts level shifter with holding latch function and new R-to-R type digital-to-analog converter (DAC). The power consumption and layout area of the proposed source driver are reduced by 23% and 25% for 16M colors and qVGA AM-OLED panel, respectively.

• ETRI Journal
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• 제9권2호
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• pp.24-35
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• 1987

A Design and Fabrication of 565 Mbit/s Optical Fiber Transmission Link We calculated the transfer functions of optical channel components and formulated the optimum transfer function of optical receiver for optical transmission to show a design rule of fiber optical link for digital transmission. And we evaluated various causes of sensitivity degradation to determine the receiver specification. Also we fabricated and demonstrated a 565Mbit/s single mode fiber optic link, 27km, to show the practicality of designed fiber optic link. The output power of the transmitter was above -3dBm, and the sensitivity of the optical receiver was -37.8dBm which is the same value we expected. Also the dynamic range was more than 25dB.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 추계학술대회
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• pp.185-187
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• 2011

최근 선박 및 물류 자동화는 물류 증대와 함께 선박의 운용을 더욱 복잡하게 만들고 있으며, 선박 내부의 통신 장비 및 통신 시스템의 구성 또한 매우 복잡하게 구성되어 있다. 때문에 지금 현재의 통신장비의 내부 통신 프로토콜은 일반적인 RS-422,485 기반의 NMEA-0183과 CAN 통신 기반의 NMEA-2000 기반으로 해상전자장비의 인터페이스 표준으로 법제화 되어있다. 본 논문에서는 가장 일반적인 NMEA-0183 프로토콜을 7-체널의 NMEA-0183 시리얼 통신 데이터를 지원하도록 설계하였으며, 그 외에 SPI 방식의 3-체널 16비트 ADC(Analog Digital Converter)와 SPI 방식의 2-체널 펄스(pulse) 입력을 받을 수 있도록 설계하였다. 특히, 선박용 통신장비의 중요한 7가지로 한정하여 설계하였다. 본 연구의 소형화를 통하여 이동이 가능하도록 하여 그 편리성을 제공하고, 소형 PC 기반의 중앙 모니터링 시스템을 구현하여 다체널 인디케이트 시스템의 효율성을 제시하고자 한다.