• Journal of Biosystems Engineering
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• 제27권5호
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• pp.451-458
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• 2002

This paper introduces that livestock can be effectively managed by an individual electronic identification system. The proposed system was composed of the original code transmitter, receiver, personal computer, micro-processor, and RS485 telecommunications module. In the individual electronic identification system, the signal including encoded information of a milk-cow was transmitted from an original code transmitter to a micro-processor through RS485 telecommunications module. The transmitted signal can be successfully displayed in a personal computer. This system can be managed by 9999 individuals with a original code transmitter. The recognition rate of an individual electronic identification system was 98.5% and also auto-feeder operates very well. an individual electronic identification system was developed for automation of stockbreeding management. To automate the breeding management, it is necessary to obtain and analyze the individual information distinguished from others preferentially.

• Journal of Biosystems Engineering
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• 제24권1호
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• pp.75-80
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• 1999

Signal separation and transmission are essential for automatic breeding management of domestic animals. Electronic identification system could transmit the signal of an individual within a defined range to a personal computer by an electromagnetic signal recognition method. Signals for individual recognition were originated by controlling 12 tri-state pins of IC(PT2262) in a transmitter. PT 2262 can generate 4,096 codes. These encoded signals were modulated and transmitted with wireless lines from the transmitter. Then they were demodulated in a receiver, and the signals were transmitted to the micro-processor through an interface and were identified in a PC.

• 한국임상수의학회지
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• 제13권2호
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• pp.171-176
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• 1996

In this study, dldctronic identification system of individual dairy cow was developed for autocatization of stoxkvreeding management. To automize the breeding management, it is necessary to obtain and analyze the individual information distinguished from others perferentially. Electronic identification system can distinguish individual livestock from others with electromagnetic wave signal recognition system. Electoronic identification system consists of transmitter transmitting the oscillated signal and receiver set. The transmitted signal from transmitter clung to individual livestock is received from the receiving antenna and the signal in different according to the established value of the register. By distinct signal recieved from the reciever, wi can distinguish the identity of a livestock from others clearly. This system can manage $2^{12}$ individuals with a reciever theoretically. However in order to reduce the errors by analogous signal, this system uses only triple number and can manage 1365 individuals with a reciever practically. This system can be connevtted to Max 232 and microcomputer for the breeding management efficiently.

• 전자공학회논문지CI
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• 제44권4호통권316호
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• pp.45-49
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• 2007

송신 시스템과 수신 시스템에 동일한 주파수를 사용하는 pulse-modulated 방식의 RFID (Radio Frequency IDentification) 시스템에서 송신 시스템과 수신 시스템 사이의 isolation특성은 중요한 문제점이다. 제안된 방법은 송신 시스템에 스위치와 믹서 오실레이터를 사용하여 RFID 시스템의 송신 시스템과 수신 시스템 사이의 isolation 특성을 개선하였다. 제안된 시스템은 송신 시스템에서 up-convert된 출력 신호와 수신 신호의 주파수를 다르게 하여 isolation 특성을 개선한 것이다. 이 방법을 사용하여 20 dB의 isolation 특성 개선 효과를 얻었다.

• 센서학회지
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• 제25권5호
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• pp.337-343
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• 2016

In this paper, we newly introduce a wireless identification system using a solar cell and RF transceivers. The reader sends interrogating signal to a transponder using LED visible light, and the transponder responds to the reader using RF signal. The transponder consists of a solar cell, an amplifier, a microprocessor, and an RF transmitter. The solar cell receives the visible light from the reader and generates current to supply electric power to the other devices in the transponder. At the same time, the solar cell detects interrogating signal in the reader light. The microprocessor senses the interrogating signal and generates a responding signal. The RF transmitter radiates the responding signal to the reader. The transponder is a passive circuit because it operates without external power. In experiments, the maximum read distance between a reader and a transponder was about 1.6 meter.

• 센서학회지
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• 제29권3호
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• pp.180-186
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• 2020

In this study, we applied edge-pulse modulation to prevent the flicker of light-emitting diode (LED) light in a visible light identification system. In the visible light transmitter, positive pulses were transmitted at the edges of the low-to-high transition points, and negative pulses were transmitted at the edges of the high-to-low transition points of the non-return-to-zero (NRZ) data waveforms. In the visible light receiver, the NRZ waveforms were regenerated by making low-to-high and high-to-low transitions at the point of the positive and negative pulses, respectively. This method has two advantages. First, it ensures that the LED light is flicker-free because the average optical power of the LED was kept constant during data transmission in the transmitter. Second, the 120 Hz optical noise from the adjacent lighting lamps was easily cut off using a simple RC-high pass filter in the receiver.

• International Journal of Computer Science & Network Security
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• 제22권11호
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• pp.241-247
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• 2022

Ad hoc network is self-organized network powered by battery. The reliability of virtual user identification and channel security are reduced when SNR is low due to limited user energy. In order to solve this problem, a joint virtual user identification and channel security en/decoding method is proposed in this paper. Transmitter-receiver-based virtual user identification code is generated by executing XOR operation between orthogonal address code of transmitter and pseudo random address code of receiver and encrypted by channel security code to acquire orthogonal random security sequence so as to improve channel security. In order to spread spectrum as well as improve transmission efficiency, data packet is divided into 6-bit symbols, each symbol is mapped with an orthogonal random security sequence. Subspace-based method is adopted by receiver to process received signal firstly, and then a judgment model is established to identify virtual users according to the previous processing results. Simulation results indicate that the proposed method obtains 1.6dB E_b/N₀ gains compared with reference methods when miss alarm rate reaches 10^-3.

• 방송공학회논문지
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• 제13권3호
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• pp.350-364
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• 2008

ATSC 방식의 지상파 디지털 TV 방송에서는 단일 주파수 망(Single Frequency Network: SFN) 구성 시 단일 주파수 사용에 따른 인접 송신기 혹은 중계기에 대한 간섭 문제가 발생한다. 이를 해결하기 위해 ATSC 권고에서는 각 송신기 및 중계기에 식별(Transmitter Identification: TxID) 신호를 할당하여 송신 및 중계 신호에 부가하여 전송하고, TxID 신호분석기를 통하여 각 송신기 및 중계기에 의해 발생되는 채널환경을 검출하여 망을 제어한다. 본 논문에서는 TxID 신호로 사용되는 Kasami 수열의 생성 및 DTV 신호로의 삽입방법에 관해 살펴보고, TxID 신호의 효율적인 분석을 위한 TxID 신호분석기의 구조를 제안한다. 또한, 수학적인 분석을 통해 제안된 TxID 신호분석기의 성능을 고찰하고, 전산실험 및 실험실 테스트를 통해 제안된 TxID 신호분석기의 성능을 검증한다.

• 방송공학회논문지
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• 제14권3호
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• pp.311-321
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• 2009

ATSC 방식의 지상파 디지털 TV 방송에서는 단일 주파수 망(SFN: Single Frequency Network) 구성 시 송신기들과 중계기들의 단일 주파수 사용에 따른 간섭 문제가 발생한다. 송신기와 송신기, 송신기와 중계기, 그리고 중계기와 중계기 간의 단일 주파수 사용에 따른 간섭문제를 해결하기 위해서는 방송망에 대한 채널 프로파일과 각각의 송신기 혹은 중계기로부터의 개별 수신 전력이 필요하다. 이를 위해 ATSC 권고에서는 각 송신기 및 중계기에 식별(TxID: Transmitter Identification) 신호를 할당하여 송신 및 중계 신호에 부가하여 전송한다. 본 논문에서는 TxID 신호를 이용하여 SFN 방송망의 채널 프로파일을 검출하고, 별도의 수신전력계측장치를 통해 SFN 방송망의 전체 수신전력을 측정한 후, 검출된 채널 프로파일과 측정된 전체 수신전력을 이용하여 각각의 송신기 혹은 중계기로부터의 개별 수신전력을 추정하는 방법을 제안한다. 또한, 필드 테스트를 통해 제안된 수신전력 추정방법의 성능을 검증한다.

• 한국인터넷방송통신학회논문지
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• 제9권6호
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• pp.9-14
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• 2009

본 논문에서는 단일 주파수 망을 이용하는 AT-DMB 시스템에서의 효율적인 송신기 검출을 위한 확산코드 슬라이싱 기술을 제안하였다. 각 송신 단말기 신호에 상관특성이 좋은 고유의 확산코드를 AT-DMB 프레임의 Null 심벌의 일부에 나누어 할당하고, 수신기에서는 송신 단말기의 고유 코드를 이용하여 다른 단말기의 신호 간섭 상황 하에서도 원하는 신호를 검출하여 수신할 수 있게 한다. 제안된 기법에 의해 얻어진 송신기 정보는 주파수를 효율적으로 사용하기 위한 기술인 SFN 구현을 위해 필요하다. 본 논문의 결과는 무선 디지털 방송 통신 시스템 구현에 적용될 수 있다.