• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.427-428
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• 2017

최근 통신 기술의 발달과 대용량화에 의하여 UPS장비를 모듈화하여 용량 증설 시 모듈을 추가로 설치하는 모듈형 UPS의 수요가 증가하고 있다. 모듈형 UPS는 용량 증설 및 수리 시 모듈 교체로 가능하고 높은 전력 밀도를 갖는 장점이 있다. 이러한 특징을 갖는 모듈형 UPS개발을 위해서는 병렬 제어가 필수이다. 본 논문에서는 저항성의 선로임피던스를 고려한 수하(Droop)제어를 이용하여 단일 모듈 33kVA를 최대 6대 병렬운전하여 총 200kVA로 동작하는 Module형 UPS의 병렬 운전기법을 제안한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.291-293
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• 2017

Security services that support electric energy service gateway require relatively high reliability. In particular, the application services that accompany communications and data are run organically. Each of the security services should support a secure service platform that supports a secure, scalable life cycle for existing services which should be extends security layer of Universal Middleware such as OSGi platform. In this convergence platform, it is the study of security transfer modular services that allow independent life cycle management of systems through Universal middleware. First, It is modular in terms of energy consumption service and data, enabling real-time operation, communications, remote management and applications. Second, the life cycle of the secure module to support the life cycle of secure, delete, start and updating of the security module by applying the security policy module layer concept. It is modular in terms of power generation and accountability, enabling us to distinguish between reliability and accountability in a large volume of data models in the smart grid, the service was intended to be standardized and applied to the security service platform.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.2
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• pp.294-305
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• 2022

Recently, drones have been widely used to solve environmental problems such as environmental protection and natural disaster monitoring. This study focuses on the problem of the search altitude of drones when using drones to search for air pollution in order to maintain the urban air environment. In particular, when exploring air pollution in cities using drones, various experiments are conducted to determine the appropriate search altitude for each air pollution source and each communication module. Through the experiment, the maximum measurable altitude for the most common air pollutants, such as CO (carbon monoxide), NO₂ (nitrogen dioxide), O₃ (ozone), and P10, P2.5 (fine dust), was identified, and the effective search altitude for each air pollution source was determined. As a result of the experiment, three types of drone search altitudes including legally measurable altitudes were suggested. The communication module measurable altitude was 60m to 120m depending on the communication module, and the effective measurable altitude was analyzed from 10m to 100m.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.8A
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• pp.1417-1427
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• 2001

본 논문에서는 밀리미터파를 이용하여 사용자에게 양방향 무선 멀티미디어의 구현을 가능케 하는 LMDS 송수신 모듈을 설계, 구현하였다. 제작된 LMDS 송수신 모듈은 신서사이져, 혼합기, 저잡음 증폭기, 고출력 증폭기, 듀플렉서 등으로 구성하였으며, 전체적으로는 전원부와 제어부를 통하여 이상여부를 감시하며, 송수신 모듈에 이상이 발생했을 때 이를 보호할 수 있도록 구현하였다. 여기서 DAVIC 표준에 맞도록 IF부 대역은 0.95∼1.45GHz의 500MHz 대역폭에서 동작하도록 제작하였고, 상하향 혼합기는 격리도 특성을 최대화하였으며, 이를 위해 하이브리드 링형을 이용한 다이오드 평형 구조를 적용하여 설계하였다. 혼합기로 주입되는 Local 주파수는 안정도가 높아야 함으로 유전체 공진형 발진기로 구현하였다. 또한 저잡음 증폭기와 고출력 증폭기는 정보통신부에서 공고한 3사 주파수 대역을 모두 수용할 수 있도록 24GHz∼26.5GHz의 대역에서 정상적인 동작을 할 수 있도록 설계하였으며, 특히 저잡음 증폭기는 잡음 환경에서 작은 신호를 손실 없이 얻을 수 있도록 잡음지수를 최소화하고, 30dB 이상의 충분한 이득이 구현되도록 하였다. 고출력 증폭기는 15dBm 이상의 출력을 송신하면서도 선형성에 문제가 없도록 혼변조왜곡(IMD) 특성을 고려하여 설계하였다. 그리고 듀플렉서는 우수한 주파수 선택도와 낮은 삽입손실 특성을 갖도록 송수신 필터 모두 5개의 공진기를 포함한 Chebyshev형 구조를 갖으며 생산성이 뛰어난 모노리딕형으로 구현하여, LMDS 송수신 성능을 구현하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.6
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• pp.77-88
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• 2008

This paper addresses the implementation of FTTH system based on G-PON technology. This system supports the duplication function that can switchover both TDM and data routes within 10msec. This system consists of OLT and ONU/ONT. G-PON OLT supports the maximum 32 2.5Gbps interfaces, and then has the flexibility and the scalability for supplying digital communication and broadcasting convergence service in the near future. OLT system consists switch module, subscriber module, processor module, and G-PON link module, and has the operating system based on Linux. ONU is installed in customer premise to supply TPS (Triple Play Service). Also ONT has the dedicated interface for IP-TV to improve the transmission characteristics of IP-TV signal.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.716-719
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• 2008

Recently industrial launderers face challenges in order to remain efficient and competitive. This paper describes the wireless laundry assorting system to prevent the economic loss caused by sorting the laundries incorrectly. Proposed system consists of wireless modules, barcode reader, and PC with base module. The wireless modules communicate with base module, and display the customer's information and amount of total and/or current sorting laundries. Proposed system works with leading services to further improve the efficiency of laundry processes.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2006.11a
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• pp.261-264
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• 2006

지능형 차량정보 시스템은 21세기 교통체계로 기대를 모으고 있는 ITS(Intellligent Transport System)의 구축에 핵심이 되는 시스템이다. 이러한 시스템을 구현하기 위해서 종래의 네비게이션, 차량용 무선통신, 차량진단 등의 단일화된 시스템을 통합적으로 수행하며, 계측 또는 수집된 데이터를 분석하여 지능적으로 차량의 주행 상태를 분석 / 진단함으로써 차량에서의 안전한 운행과 운전자 및 승객들이 요구하는 정보 또는 다양한 서비스를 제공하기 위한 새로운 모듈의 개발이 절실히 필요한 실정이다. 따라서, 본 논문에서는 CAN(Controller Area Network) BUS을 이용한 차량의 상태수집 모듈과 능동 데이터베이스에 관해 기술하고 이를 통합하기 위한 임베디드 보드를 이용한 CAN BUS연계형 차량용 복합통신모듈의 프로토타입 H/W을 구성하여 실용화 가능성 및 유용성을 제시하고자 하였다.

• Journal of IKEEE
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• v.19 no.4
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• pp.617-624
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• 2015

In this paper, an adult authentication system based on authentication certificate was designed and implemented using smartphone and near-field communication. It has three advantages. First, it achieves easy, convenient, and fast authentication by using smartphone and near-field communication. Second, it achieves extremely high security and reliability by exploiting authentication certificate. Third, it achieves extremely low risk of personal information leakage by generating and sending only virtual identification code. Finally, it has a proper legal basis by Digital Signature Act. It consists of adult authentication module, near-field communication control module, policy server module, and database server module. A prototype of the proposed system was designed and implemented, and it was verified to have correct operation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.6
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• pp.1045-1054
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• 2006

In this paper, described a design result of bus interface modulo for multiple level MU-SID-1553 data bus network. In general, MIL-SID-1553 network is used for single level data bus topology. But, according to applied system's structure. multiple level bus architecture is required., And for his, micro processor must be involved for system be, and a additional hardware and software functions are needed. The designed data bus interface module is simply consists of communication transceivers and simple electronic circuit without micro processor. Through the hardware testing and software simulation, the functional performance of the designed interface module was successfully validated.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.4
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• pp.122-128
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• 2017

In order to simplify the wiring of construction heavy equipment, researches on PLC(Power Line Communication)-CAN(Controller Area Network) communication module are actively proceeding. Even if a PLC-CAN communication module is developed, a simulator capable of judging whether the PLC-CAN communication module is operating normally is needed. In this paper, we designed and developed a simulator that can measure the status of PLC-CAN communication module. We analyzed the characteristics of the power line communication frequency band by analyzing the characteristics of the power line and compared the noise characteristics with the passenger car in order to characterize the heavy equipment noise.