• 전자공학회논문지C
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• 제35C권1호
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• pp.34-41
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• 1998

In this paper, I designed a P1394 serial bus chip as new bus interface architecture which can transmit the multimedia data at the rate of 400 Mbps and guarantee necessary bandwidth. because multimedia data become meaningless data after appropriate time, it is necessary to transfer multimedia data in real time, P1394 serial bus chip designed in this paper support isochronous transfer mode to solve this problem. Also, designed P1394 serial bus chip can transfer high quality video data or high quality audio data because it support the speed of 400 Mbps. While user must set device ID manually in previous interface such as SCSI, device ID is automatically determined if user connect each node with designed P1394 serial bus cable and power on. To design this chip, I verified the behavioral of the entrire system and synthesized layout. Also, I did layout the analog blocks and blocks which must be optimized in full custom.

• 한국통신학회논문지
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• 제31권10A호
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• pp.996-1002
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• 2006

USB(Universal Serial Bus)는 최근 컴퓨터시스템에서 가장 인기 있는 인터페이스 중의 하나인데 이를 보다 확대하여 사용 시 즉, 다수의 디바이스들이 서로 연결되는 댁내망을 구성할 때는 버스대역을 시분할 다중화(TDM, Time Division Multiplexing) 방식으로 사용하는 USB의 특징상 버스대역의 병목현상을 초래하게 되는 데 이러한 상황을 보다 효율적으로 대처할 수 있는 버스 대역 사용방안을 제안한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.389-393
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• 1987

This paper describes the configuration of serial interconnection BUS, BitBUS, for Energy Management Systems, and it provides low cost, high performance approach in distributed data acquisition and control applications.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1013_1014
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• 2009

In this paper, the electrical interfaces used in between COMS satellite bus and Ka-band communication payload are analyzed to verify the robustness of data bus. The purpose of the serial data bus of satellite is to allow serial data transfer between one bus controller or source equipment to several user terminals or slave equipments. A serial data bus in COMS satellite is mainly used for Channel Amplifier and Digital Control Unit of Ka-band Payload.

• Journal of Power Electronics
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• 제11권4호
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• pp.533-541
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• 2011

The redundant operation of a parallel AC to DC converter via a serial communication bus is presented. The proposed system consists of three isolated CUK power factor correction modules. The controller for each converter is a dsPIC30F6010 microcontroller while a RS485 communication bus and the clock signal are used for synchronizing the data communication. The control strategy of the redundant operation relies on the communication of information among each of the modules, which communicate via a RS485 serial bus. This information is received from the communication checks of the converter module connected to the system to share the load current. Performance evaluations were conducted through experimentation on a three-module parallel-connected prototype, with a 578W load and a -48V dc output voltage. The proposed system has achieved the following: the current sharing is quite good, both the transient response and the steady state. The converter modules can perform the current sharing immediately, when a fault is found in another converter module. In addition, the transient response occurs in the system, and the output voltages are at their minimum overshoot and undershoot. Finally, the proposed system has a relatively simple implementation for the redundant operation.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.535-536
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• 2006

In the embedded system, external device interface that operates serial protocol with lower speed than the general computers is used commonly. This paper describes I2C bus protocol that is a bi-directional serial bus with a two-pin interface. The I2C bus requires a minimum amount of hardware to relay status and reliability information concerning the processor subsystem to an external device.

• ETRI Journal
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• 제32권5호
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• pp.713-721
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• 2010

E-textile technology has earned a great deal of interest in many fields; however, existing wearable network protocols are not optimized for use with conductive yarn. In this paper, some of the basic properties of conductive textiles and requirements on wearable personal area networks (PANs) are reviewed. Then, we present a wearable personal network (WPN), which is a four-layered wearable PAN using bus topology. We have designed the WPN to be a lightweight protocol to work with a variety of microcontrollers. The profile layer is provided to make the application development process easy. The data link layer exchanges frames in a master-slave manner in either the reliable or best-effort mode. The lower part of the data link layer and the physical layer of WPN are made of a fabric serial-bus interface which is capable of measuring bus signal properties and adapting to medium variation. After a formal verification of operation and performances of WPN, we implemented WPN communication modules (WCMs) on small flexible printed circuit boards. In order to demonstrate the behavior of our WPN on a textile, we designed a WPN tutorial shirt prototype using implemented WCMs and conductive yarn.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2499-2502
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• 2005

Universal Serial Bus (USB) is one of the most popular communication interfaces. When USB is used in more extended range, especially configuring home network by connecting multiple digital devices each other, USB interface uses the bandwidth in the way of Time Division Multiplexing (TDM) so that the bottleneck of bus bandwidth can be brought under the heavy traffic. In this paper, the more effective usage of bus bandwidth to overcome this situation is introduced. Basically, in order to realize the system for transferring real-time moving picture data among digital information devices, we analyze USB transfer types and descriptors and introduce the method to enhance the detailed performance of isochronous transfer that is one of USB transfer types.

• ETRI Journal
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• 제32권4호
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• pp.540-547
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• 2010

One of the critical issues in on-chip serial communications is increased power consumption. In general, serial communications tend to dissipate more energy than parallel communications due to bit multiplexing. This paper proposes a low-power bus serialization method. This encodes bus signals prior to serialization so that they are converted into signals that do not greatly increase in transition frequency when serialized. It significantly reduces the frequency by making the best use of word-to-word and bit-by-bit correlations presented in original parallel signals. The method is applied to the revision of an MPEG-4 processor, and the simulation results show that the proposed method surpasses the existing one. In addition, it is cost-effective when implemented as a hardware circuit since its algorithm is very simple.

• 한국통신학회논문지
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• 제18권9호
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• pp.1332-1347
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• 1993

기존의 계측기기는 기능에 따라 독립적으로 이루어져 사용자는 사용목적에 따라 각각의 계측기를 이용하여 원하는 계측 시스템을 구성하였다. 그러나 1980년대 후반 VXIbus는 다양한 계측장비를 각각 한장의 카드로 만들어 선택적으로 계측시스템을 구성하는것을 가능하게 하였다. VXIbus의 기본전인 통신 프로토콜에는 word serial 프로토콜이 있다 . 그러나 측정된 데이타의 양이 증가하게 되면 word serial 프로토콜로 인한 전체 시스템의 성능 저하를 가져오게 된다. 본 논문에서는 이러한 성능제한요소를 해결하기 위하여 공유(shared) 메모리 프로토콜을 제안하고, 기존의 word serial 프로토콜과 공유메모리 프로토콜을 GSPN(Generalized Stochastic Petri Net)를 이용하여 분석하였다. 분석한 결과 공유메모리 프로토콜이 word serial 프로토콜보다 성능이 우수함을 알 수 있었다. 또한 제안된 공유 메모리 구조를 갖는 VXIbus 시스템을 구현하였으며 사용된 계측기기로는 VXIbus인터페이스 모듈과 VMEbus 전용 신호처리모듈로 구성 된 FFT 분석 디바이스 그리고 신호발생 디바이스가 이용되었다. FFT 분석실험 결과 최대 80 KHz 입력신호에 대하여 정확하게 분석되었으며 이 결과는 기존의 FFT분석기의 결과와 잘 일치하였고, 신호발생 실험에서는 200 KHz에서 1.1GHz까지의 정현파 신호가 발생되었다.