• 한국정보통신학회논문지
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• 제24권5호
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• pp.623-629
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• 2020

본 논문은 협대역 다중전송시스템의 구조 및 다중전송에 적합한 등화기의 성능 분석에 관한 것으로서. 등화 성능의 극대화를 위하여 다중전송에 있어 레인징 기법에 기반한 전송 시점 제어 방법을 제안하고, 제안된 다중 전송기법에 적합한 연판정 및 강판정 조합 궤환 적응 판정 등화기를 제안하였다. 본 논문에서 제안하는 연판정 및 강판정 조합 궤환 적응 등화기는 SNR의 범위에 따라 궤환 적응 등화기의 입력으로 사용되는 판정 방법을 가변하는 것이다. 제안된 기법의 우수성을 입증하기 위하여 페이딩 채널 환경에서 모의실험을 통하여 제안된 방법의 성능을 검증하였다. 성능 검증결과, 기존 방법과 비교하여 본 논문에서 제안하는 방법이 큰 복잡도 증가 없이 기존 방법의 성능을 뛰어넘는 우수한 성능을 보임을 확인하였다.

• 융합보안논문지
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• 제23권1호
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• pp.139-145
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• 2023

한국 육군은 기동화, 지능화, 초연결형 Army TIGER 체계 등 최첨단 미래형 강군 육성을 추진하고 있다. 미래 보병여단은 다영역작전에서 전투수행이 가능하도록 분대 단위 전술차량으로 기동성을 증대시키고, 지상무인로봇, 감시정찰드론 등 다양한 무기체계를 전력화할 예정이다. 또한 무기체계를 통해 수집한 데이터를 초연결 네트워크로 실시간 송·수신하고 학습시키는 지능형 부대를 육성할 것이다. 이러한 군의 발전 계획을 통해 미래의 보병여단은 더 많은 데이터를 유통시킬 것이다. 그러나 현재 육군의 전술정보통신체계는 미래 무기체계의 대용량 정보를 유통하기에 상대적으로 낮은 전송속도와 대역폭, 수동적 네트워크 관리, 기동 간 통신 지원 제한 등 미래의 부대의 전술통신체계로 운용하기에는 한계가 있다. 따라서 본 논문에서는 한국 육군의 미래 보병여단의 무기체계를 분석하고, 보병여단의 기동 상황을 묘사하기 위한 공격작전 시나리오를 바탕으로 지상·공중·위성 계층의 통합 전술통신망 M&S를 통해 미래 보병여단이 갖추어야 할 정보유통능력을 제시한다.

• Journal of the Optical Society of Korea
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• 제6권4호
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• pp.141-164
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• 2002

A 42 channel demultiplexer for dense wavelength division multiplexing(WDM) using photopoly-mer volumetric diffraction grating that has excellent optical properties and low cost capability, has been designed and optically demonstrated. From the experimental results, we have obtained the 3 dB bandwidth of 0.18 nm, crosstalk suppression of 20 dB and channel uniformity of 1.6 dB for 50 GHB channel spacing.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.485-488
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• 2000

This paper proposes to design the residential power line communication device using Softwire Protocol, which targets the device with 8bit micro-controller and small-size memory based on low-rate power line communication network or wireless communication network. As a case study, the SCP message specification of air-conditioner that has capability of control and monitoring its status is designed using Softwire Protocol. And, it is described how the device operates sequentially.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.52-55
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• 2004

Digital communication networks have become a core technology in advanced building automation systems. BACnet(${\underline{B}}uilding$ ${\underline{A}}utomation$ and ${\underline{C}}ontrol$ ${\underline{net}}works$) is a standard data communication protocol designed specifically for building automation and control systems. BACnet adopts Master-Slave/Token-Passing (MS/TP) protocol as one of its field level networks. In this study, we introduce a method of implementing bandwidth allocation scheme in the MS/TP protocol. The bandwidth allocation scheme improves the capability of real-time communication of the original MS/TP protocol. The bandwidth allocation scheme introduced in this paper can be easily implemented in the existing MS/TP protocol with a slight modification. In this study, we actually developed the hardware and firmware of MS/TP module in which bandwidth allocation scheme is implemented.

• Nuclear Engineering and Technology
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• 제31권2호
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• pp.226-235
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• 1999

Applying digital network technology for advanced nuclear plant requires deterministic communication for tight safety requirements, timely and reliable data delivery for operation-critical and mission-critical characteristics of nuclear plant. Communication protocols, such as IEEE 802/4 Token Bus, IEEE 802/5 Token Ring, FDDI, and ARCnet, which have deterministic communication capability are partially applied to several nuclear power plants. Although digital communication technologies have many advantages, it is necessary to consider the noise immunity from electromagnetic interference (EMI), electrical interference, impulse noise, and heat noise before selecting specific digital network technology for nuclear plant. In this paper, we consider the token frame loss and data frame loss rate due to the link error event, frame size, and link data rate in different protocols, and evaluate the possibility of failure to meet the hard real-time requirement in nuclear plant.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1996년도 춘계공동학술대회논문집; 공군사관학교, 청주; 26-27 Apr. 1996
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• pp.324-327
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• 1996

In this paper, the affecting factors of the access demand for the cellular service are derived, and the access demand function of the cellular service is estimated. The results obtained in this study are as follows: First, the price (access charge) and the income elasticities of cellular services there exists a network externality in cellular communication services. Third, the technological capability of the service provider has played an essential role in expanding the size of subscribers. Fourth, the access demand of cellular communication service is not sensitive to the usage charge. According to the above results, it can be inferred that if the access charge is lowered, the number if subscribers will increase to the critical mass, and then the cellular communication market will grow up to a saturation point naturally.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1836-1839
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• 2005

We have developed Ethernet based real-time communication systems called "Vnet/IP" for DCS which is the control system for process automation. This paper describes the features and the technologies of the ASIC which is utilized in the communication interface hardware for Vnet/IP. Vnet/IP has been developed for mission-critical communications. Hence it has real-time feature, high reliability and precise time synchronization capability. At the same time, it is able to deal with standard protocols without influence on mission-critical communications. The communication interface hardware has a host interface and dual redundant network interfaces. The host interface can be chosen PCI-bus or R-bus which is the proprietary internal bus developed for the high reliable redundant controller. Each network interface is a RJ45 connection with 1Gbps maximum in compliance with IEEE802.3.

• 한국가정과학회지
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• 제2권1호
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• pp.52-67
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• 1999

The primary purpose of this study was to analyze the types of home managers in association with effects of resourcefulness, communication and the conditions for effective home management＇ proposed by Shape and Winter(1991). A survey was conducted by subjects of 300 wives in Kwangju city. The statistical data were obtained by cluster analysis, one-way ANOVA, Duncan＇s test and chi-square test. Manager types based on the four conditions, resourcefulness and communication were classified into four clusters. Educational background, job status, family types, family life cycle and age difference between the oldest and the youngest child of the subjects were different from manager types. In conclusion, this study identified the four conditions of performance-condition dichotomy, timing, high level and middle range, resourcefulness, and communications in order to develop managerial capability. (Korean J Human Ecology 2(1) : 52∼67, 1999)

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.183-184
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• 2007

As the mobile communication service is widely used, the demand for wireless repeaters is rapidly increasing because of the easiness of extending service areas. But wireless repeaters has a problem that the output of the transmit antenna is partially fed back to the receive antenna, which results in feedback interference. In this paper, we investigate the performance of adaptive variable step-size NLMS-based algorithms for cancelling the interference signals in the W-CDMA system under time-varying multipath channels. The criteria for comparison are tracking capability, convergence speed, and complexity.