• TTA Journal
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• s.96
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• pp.86-93
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• 2004

한국정보통신기술협회(이하 TTA)는 2004월 1월부터 GSM 휴대폰에 대한 국제공인 인증시험을 제공하기 위해 시험설비 구축업무를 시작하여 지난 10월 1일부터 정식 인증시험을 제공하고 있다. 이에 본 고는 TTA가 제공하는 GSM 휴대폰 인증시험 종류, 시험장비, 시험서비스 장점 그리고 시험서비스 신청절차에 대하 소개하도록 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.677-684
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• 2017

Smart devices are used in a variety of industries, because applications for them are easy to develop and portable. However, industrial equipment can cause security problems for information and accidents when controlling the actuator of the equipment at a remote location. In this paper, we studied methods of solving these problems and the advantages of applying smart control systems to industrial equipment. We propose a manual manipulation method using queries and a smart control access procedure for controlling equipment using a smart device. In addition, we propose a data transmission method employing multiple encryption protocols and a user authentication method using unique information from the smart device and Q & A as the communication data protection and user authentication methods, respectively. In order to evaluate its performance, an operation test of the smart control system and user authentication comparison experiment were performed. In order to understand the advantages of applying the smart control system to the equipment, we conducted a comparative experiment with a teach pendant and evaluated its reaction time in case of error.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.11
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• pp.1109-1117
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• 2017

In this work, a new control module and communication system associated with DSP are proposed to overcome the limitations of the contemporary prevailing PLC-based industrial equipment controller, and the performance of the proposed system was experimentally verified. In the light of this issue, a communication conversion scheme from RS-485 to Modbus, the dominant communication protocol used by PLC, was developed and shown to yield enhanced compatibility between devices. The proposed system allows for ~50％ cost reduction as well as downsizing of the industrial controllers. Furthermore, the design includes 24 V general digital I/O pins, which facilitate partial expansion of inputs and outputs. With Modbus communication implemented in DSP with the RS-485 interface, multi-to-multi communication may also be achieved.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.12
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• pp.1315-1320
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• 2015

In this paper Communication data link equipment on a high speed-hopping method to use the frequency resources efficiently for the frequency environment is introduced such as sensing techniques, using the same frequency band by using the received two-channel technique and the receive filter bank unit applied to be shared with other equipment such as radar and so on. The real-time measurement and analysis were operated for measurement the frequency environment of the operating band in advance. and primarily equipment to develop is analyzed how the interference effect to the radar minimize the operation of radar equipment. In reverse, to use the same frequency band the methods such as frequency sharing techniques are presented in this paper. Finally, by design of the main items of the RF transceiver NF, transmission output, and a simulation of the IMD, such as whether the key is verified prior to meet specifications.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.552-555
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• 2010

In this paper, we propose a context-aware system using wireless multi sensor module to monitor the state for industrial factory environment. Wireless multi sensor module combines sensing values which are collected from each acceleration, pressure, temperature and gas sensors. Moreover, it delivers this data to server after being encoded by RS code. Thereafter, RS decoder decodes the values that are received from wireless multi sensor module and fixes errors which occur in wireless communication. Based on decoded data, context-aware algorithm sets critical range and compares it to the sensing values, if the sensing values are out of the range, an event occurs by the algorithm. At the same time, if there is another sensing value which is out of the range for standby time T seconds, the algorithm orders 3 steps-alarm to occur depending on each situation. Through this system, it becomes eventually possible to monitor machines' condition effectively. From the simulation, we confirm that this system is efficient to status monitoring of industrial automation equipment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.6
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• pp.342-349
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• 2019

We describe and anlayzes the methodology and implementation results of H / W configuration and signal characteristics analysis algorithm for analyzing equipment for analyzing OFDMA physical layer based on 802.16e. Recently, demand for signal analysis of instruments that analyze these signals with the development of digital communication signals is rapidly increasing. Accordingly, it is necessary to develop signal analysis equipment capable of analyzing characteristics of a broadband communication signal using a wideband digital signal processing module. In this paper, we have studied the basic theory of OFDMA in order to devise a device capable of analyzing characterisitcs of broadband communication signals. Second, the structure of OFDMA transmitter/receiver was examined. Third, a wideband digitizer was implemented. we design Wimax signal analysis algorithm based on OFDMA among broadband communication methods and propose Wimax physical layer analysis S/W implementation through I, Q signals. The IF downconverter used the receiver module and the LO generation module of the spectrum analyzer. Quantitative analysis result is obtained through the algorithm of Wimax signal analysis by I, Q data.

• Journal of Convergence for Information Technology
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• v.12 no.4
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• pp.1-8
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• 2022

With the development of communication infrastructure, the number of network equipment owned by one person is gradually increasing. General-purpose devices such as smartphones can implement theft/loss prevention function by implementing S/W. However, other small devices lack practicality such as long-distance communication problems due to standard communication technology specifications or H/W limitations, and lack of functions(authentication and security). This study combines the Lora communication protocol in the LPWA standard environment and the blockchain technology. Anti-theft and security functions were added to the protocol, and the PBFT consensus algorithm was applied to build a blockchain network. As a result of the test, the effectiveness of safety(authentication and trust network) and performance(blockchain processing performance) were confirmed. This study aims to contribute to the future development of portable or small device anti-theft products as a 4th industrial convergence research.

• Electronics and Telecommunications Trends
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• v.4 no.4
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• pp.108-134
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• 1989

본 고는 현재 공중회선망을 이용한 PC 통신에 필수장비인 모뎀을 구성하는 2,400bps Modem Chip Set을 비교하였다. 현재 널리 사용되는 Modem Chip Set들은 주로 2-3개 Chip으로 구성되며, 이것들을 사용하여 완전한 2,400bps Modem을 구성할 수 있다. 이러한 모뎀용 IC는 PC통신뿐만 아니라 휴대용 Terminal, 차량추적시스팀, 휴대용 전화기, 각종 원격검침계량기 등에서와 같이 그 사용범위가 다양화되고 있는 추세이다.

• Information and Communications Magazine
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• v.21 no.8
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• pp.29-42
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• 2004

통신기술 발전의 한 측면을 살펴보면 TMN을 통한 이종 장비의 관리, 망의 통합을 통한 비용의 절감, 신규서비스 개발에 의한 수익 창출을 목표로 해왔다고 볼 수 있다. 광대역 통합망은 현재 독립적인 망이 갖고 있는 한계를 극복하고 음성, 데이터, 방송 등 모든 서비스를 하나의 네트워크로 연결하여 미래 출현할 품질 보장형 멀티미디어 서비스를 언제 어디서나 끊김 없이 안전하게 제공할 수 있는 정보통신 인프라로 정의할 수 있다.(중략)

• 한국정보통신설비학회:학술대회논문집
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• 2004.08a
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• pp.390-394
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• 2004

우리나라를 세계 최고의 IT강국으로 만든 초고속인터넷과 이동통신은 급속한 성장기를 거쳐 이제는 완만한 성숙기에 접어들고 있다. 이와 같은 상황에서 새로운 IT 성장동력을 견인하고 IT 선도국으로서 입지를 강화하기 위해 IT839 전략의 일환으로 통신사업자, 장비제조사, 정부 주도로 휴대인터넷 서비스의 조기 도입을 적극 추진하고 있다. 본 연구에서는 휴대인터넷서비스의 중요한 핵심요소로 인식되고 있는 단말기의 최근 동향, 예상되는 형상, 성공요인 등에 대해 검토하고 바람직한 추진방향을 제시해 보았다.