• Journal of Advanced Navigation Technology
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• v.12 no.6
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• pp.646-652
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• 2008

Recently, as the ship has undergone a development for smart ship or digital ship. PLC is communication system using the preexistence power line and using PLC as transmission medium to monitoring of equipments is an efficient way to design a system for ship. In this paper, we design and implement RFID monitoring system based on PLC for ship. This proposed system can support monitoring the moving of passenger, crew and important cargo by RHO tag data on shipboard.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2003.06a
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• pp.276-279
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• 2003

본 논문에서는 블루투스 장비 간 암호화를 위해 사용되는 암호화 모듈의 설계 및 구현에 관한 내용을 다룬다. 암호화 모듈은 기저 대역내에 암호화 키 생성 모듈과 암호화 엔진 모듈로 구성된다. 암호화 키 생성 모듈은 Cylink사에서 제안한 공개 도메인인 SAFER+(Secure And Fast Encryption Routine) 알고리즘을 사용하여 128bit 키를 생성한다. 그 구성은 키 치환을 위한 치환 함수(key-controlled substitution)와 선형 변환을 위한 PHT(Pseudo-Hadamard Transform)와 Armenian Shuffle 변환기로 구성된다. 암호화 엔진 모듈은 전송 패킷내의 페이로드 데이터와 생성된 사이퍼 키 스트림 데이터와 XOR연산을 통하려 암호화를 행하며 그 구성은 LFSR (Linear Feedback Shift Register)와 합 결합기로 구성된다. 이 중 암호화 키 생성 모듈은 LM(Link Manager)의 PDU(Protocol Data Unit) 패킷을 통해 상호 정보가 교환되므로 암호화키를 생성하는데 있어 시간적 제약이 덜 하다. 따라서 본 논문에서는 변형된 SAFER+ 알고리즘 구현하는데 있어 치환 함수의 덧셈과 XOR, 로그, 지수연산을 바이트 단위의 순차 계산을 수행함으로써 소요되는 하드웨어 용량을 줄이도록 설계하였다. 본 논문에서 제시한 모듈은 블루투스 표준안 버전 1.1에 근거하여 구현하였으며 시뮬레이션 및 테스트는 Xilinx FPGA를 이용하여 검증하였다.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2003.06a
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• pp.292-295
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• 2003

블루투스 전송 기술은 2.4㎓ 의 ISM(Industrial Scientific Medicine)밴드에서 주파수 호핑 방식을 사용한다. 주파수 호핑율은 연결 상태에서 초당 1600회, 조회 또는 호출 상태에서 초당 3200회의 호핑을 한다. Hop 채널 선택은 블루투스 표준안에서 제시한 5개의 호핑 시퀸스 중 하나를 선택하고 호핑 주파수에 따라 이를 매핑 함으로써 이루어진다. 본 논문에서는 6개의 상태에 따라 다르게 실행되는 채널 계산을 효율적으로 제어하고 필요한 연산모듈의 수를 줄이기 위해 9비트 프로세서를 이용해 Hop 선택 모듈을 설계하고 구현한다. 설계된 모듈은 레지스터 파일, 마이크로프로그램 제어장치, 가산, 치환(permutation), Modulo 계산을 위한 3개의 연산장치로 구성된다. Hop 채널 계산 중 가장 클럭 소요가 큰 Modulo 연산은 SRT나눗셈 알고리즘을 사용하여 음수 값 계산 및 연산 속도 향상을 꾀하였다. 제시된 Hop 선택 모듈은 하드웨어 묘사언어인 VHDL로 설계하고 시뮬레이션 및 테스트는 Xilinx FPGA를 이용해 검증하였다.

• Journal of Advanced Navigation Technology
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• v.11 no.3
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• pp.233-238
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• 2007

In this paper, a wireless sensor network system was embodied inside the shipping for digital ship. First, the analysis of radio environment inside ship are investigated. As a result, it was confirmed that a wireless sensor network system can be applied inside the ship. Using Shipboard Wireless Sensor Network System based on IEEE 802.15.4 technique, we designed, and made the prototype of Zigbee Node and RFID Reader. We could be sensing on shipboard and testing entrance of crew by using Zigbee Node and RFID Reader. The sensing and exit or entry control data are transmitted a server system through internet that connected Wireless Gateway with AP, so we can monitoring the saved data on shipboard database.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.3
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• pp.47-53
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• 2017

There is a difficulty in preventing drunken driving by enforcing alcohol control on the sea due to the environment of Marine transportation rather than roads. In the previous study, we proposed the algorithm, that was developed to identify the voices changed according to be drunk. Using the developed algorithm, it became possible to know the possibility of drinking by long distance ship operators and crew members. In that method drinking can be measured in real time, no matter how far the distance is, if the interception is through a voice that can be transmitted over a distance, rather than a short distance. When communicating voice using the VTS wireless devices, clipping occurs when that environment is uneven, and the rate of judgment of the possibility of drinking may be lowered. Therefore, in this paper, we proposed an enhanced method to compensate the signal in order to reduce the error rate of the possibility of drinking due to distortion of the speech signal.

• Journal of the Institute of Convergence Signal Processing
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• v.6 no.4
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• pp.206-211
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• 2005

We describe the design for a correlator and an access code generator in bluetooth system. These are used for a connection setting, a packet decision and a clock synchronization between Bluetooth units. The correlator consists of two blocks; carry save adder based on Wallace tree and threshold-value decision block. It determines on an useful packet and clock-synchronization for input signal of 1.0Mbps through the sliding-window correlating. The access-code generator also consists of two blocks; BCH(Bose-Chadhuri-Hocquenghem) cyclic encoder and control block. It generates the access-codes according to four steps' generation process based on Bluetooth standard. In order to solve synchronization problem, we make use of any memory as a pseudo random sequence. The proposed correlator and access-code generator were coded with VHDL. An FPGA Implementation of these modules and the simulation results are proved by Xilinx chip. The critical delay and correlative margin based on synthesis show the 4.689ns and the allowable correlation-error up to 7-bit.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.2
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• pp.69-74
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• 2017

These days as there are a growing vessel volume in the costal area, the marine accidents has being increased. IMO recommend that all vessels have to be equipped with the safety equipments mandatorily for the safety navigation. Almost medium and large size vessels are equipped with the safety navigational equipments, But many small size vessels are not equipped with those ones because of its owner's financial hardship or indifference. So for the safety of small size vessels in the coastal area, the marine accidents such as stranding, sinking, collision, and so on, have to be protected in advance or the occurred accidents has to be treated quickly. In this paper, the safety equipment for small size vessels having these functions has been developed. This equipment can guarantee the safety of small size vessels in defenseless state considerably by displaying these states in seamen's Smart phone or the cheap dedicated terminal and also informing the control center and nearby other vessels of these states.

• Journal of Radiation Protection and Research
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• v.39 no.3
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• pp.150-158
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• 2014

Radiation-related practitioners and radiation-treated patients at medical institutions are inevitably exposed to radiation for diagnosis and treatment. Although standards for maximum doses are recommended by the International Commission on Radiological Protection (ICPR) and the International Atomic Energy Agency (IAEA), more direct and available measurement and analytical methods are necessary for optimal exposure management for potential exposure subjects such as practitioners and patients. Thus, in this study we developed a system for real-time radiation monitoring at a distance that works with existing portable device. The monitoring system comprises three parts for detection, imaging, and transmission. For miniaturization of the detection part, a scintillation detector was designed based on a silicon photomultiplier (SiPM). The imaging part uses a wireless charge-coupled device (CCD) camera module along with the detection part to transmit a radiation image and measured data through the transmission part using a Bluetooth-enabled portable device. To evaluate the performance of the developed system, diagnostic X-ray generators and sources of $^{137}Cs$, $^{22}Na$, $^{60}Co$, $^{204}Tl$, and $^{90}Sr$ were used. We checked the results for reactivity to gamma, beta, and X-ray radiation and determined that the error range in the response linearity is less than 3% with regard to radiation strength and in the detection accuracy evaluation with regard to measured distance using MCNPX Code. We hope that the results of this study will contribute to cost savings for radiation detection system configuration and to individual exposure management.

• International Commerce and Information Review
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• v.16 no.1
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• pp.207-226
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• 2014

A trade logistic informatization system under Open Systems Interconnection(OSI) includes a Port Management Information System, a Maritime Information System, and an Export and Import Batch Processing System. These have made a great contribution in the creation of more convenient and efficient management for the logistics industries in our country. However, this management is exposed to the technological problems of networks due to the explosive use in the sending and receiving of e-documents. For our country to grow as a center for port and logistic information, we should make the best use of the control systems using networks and further advance the export and import logistic systems. Therefore, this study aims to propose management systems for a composite network and an invasion detection system for efficient management of an e-trade network under OSI. Methods to rationalize the internal organizations such as coordination of organizations and human resources according to alloted network functions, commissions and arbitrary decisions, and reorganization of relevant regulations are not discussed here. This study looked at trade network under OSI from the aspect of practical business affairs and presented a basis for further interpretation.