• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.697-700
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• 2007

산업현장에서 이용되는 각종 제어 및 계측 시스템들은 그 용도에 따라 여러 개의 프로세서 모듈이나 기기들로 나뉜다. 이들 프로세서 모듈이나 기기들은 각각의 기능이나 요구 사항에 따라 서로 다른 공간에 설치, 운용 되며 정보교환과 제어를 위하여 통합된 데이터 처리 기술을 필요로 한다. 본 논문에서는 이러한 분산 시스템들의 경제적이고 효율적인 통신을 위한 버스 중재 기법에 대하여 다루고 있다. 제안 된 구조는 메시지 기반 데이터 교환 방식으로 이를 위해 표준 메시지 규격을 정의하였으며 메시지를 해석하여 경로를 설정하고 버스 중재를 담당하는 버스 중재 모듈을 구현하였다. 또한 구현된 버스 중재 모듈을 사용하여 실제 검측 시스템을 구성하고 실험하였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.1
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• pp.159-164
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• 2013

Recently the solution integrated of vision and motion controller which are important element in automatiomn system has been many developed. However typically such a solutions has a many case that integrated vision processing and motion control into network or organized two chip solution on one module. We implement one chip solution integrated into vision and motion controller using Zynq-7000 that is developed recently as extended processing platform. We also apply EtherCAT to motion control that is industrial Ethernet protocol which have compatibility for open standardization Ethernet in order to control of motion because EtherCAT has a secure to realtime control and can treat massive data.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.5
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• pp.1061-1066
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• 2012

A digital memory has been widely used as a device for storing information due to its reliable, fast and relatively simple control circuit. However, the storage of the digital memory will be limited by the inablility to make smaller linewidths. One way to dramatically increase the storeage capability of the memory is to change the type of stored data from digital to analog. The analog memory fabricated in a standard single poly 0.6um CMOS process has been developed. Single cell and adjacent circuit block for programming have been designed and characterized. Applications include low-density non-volatile memory, control of redundancy in SRAM and DRAM memories, ID or security code registers, and image and sound memory.

• Journal of Satellite, Information and Communications
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• v.8 no.4
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• pp.124-129
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• 2013

An electrostatic discharge (ESD) protection device, so called, N-type SCR with P-type MOSFET pass structure (NSCR_PPS), was analyzed for high voltage I/O applications. A conventional NSCR_PPS device shows typical SCR-like characteristics with extremely low snapback holding voltage, which may cause latch-up problem during normal operation. However, a modified NSCR_PPS device with counter pocket source(CPS) and partial p-type well(PPW) structure demonstrates highly latch-up immune current-voltage characteristics.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.9A
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• pp.1425-1433
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• 1999

In this Paper, we analyzed the HIPERLAN(Hlgh PErformance Radio LAN) MAC(Medium Access Control) protocol, which was a standard for Wireless LANs defined by ETSI. We analyzed mathematically the elimination phase and the yield phase of the channel contention phase of CAC(Channel Access Control) layer in the infinite population model of the HIPERLAN using EY-NPMA(Elimination Yield-Nonpreemptive Priority Multiple Access)protocol. Also we analyzed the probability of successful transmission in the transmission phase. And, we proved results of a mathematical analysis by the simulation of HIPERLAN MAC protocol.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.4
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• pp.737-746
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• 2009

In this study, we have developed one chip system IC for preventing the overload, detecting an abnormal conditions, and controlling the fire prevention in the intelligent home appliances. For the purpose, a circuit detectable an electric leak for preventing an electric shock, and a circuit detectable arc that has effect directly on the fire are designed. The circuits designed on every block are verified by comparing simulation with bread-boarding using a standard transistors. The system IC is fabricated by using 34 V 2 metal $1.5{\mu}m$ bipolar transistor process from evaluation results. The electrical performances of IC application circuits and the system IC equipped on PCB board are evaluated. It is confirmed that the system IC is well operated for arc and ground fault(GF) signal.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.6
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• pp.49-56
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• 2011

Leisure bicycles are fabricated in a variety of ways these days. Although, the bicycles are designed and manufactured in a variety of ways by numerous companies, customer has a difficulty in gaining information of bicycle which suits them. Accordingly most of buyers purchase bicycle considering body size. Employing the method is one of the ways to decide bike size on the ground of standard body measurement. However, the method above to purchase bicycle is not appropriate for customer considering his/her body. The research mainly aims to design bicycle which allows buyer to adjust optimal design system by himself/herself considering his/her body size. In addition, a device employing fuzzy controller implemented bicycle run test. Using on the result, the research explored an optimal bicycle system which makes a decision whether a bicycle fits body of customer.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.1C
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• pp.36-47
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• 2002

MGCP ia standard protocol by IFTF, which is designed to facilitate inter-working with other protocols. Since the nature of protocol, it can be known as a proper solution to integrate heterogeneous networks consisted of various protocols and systems. In this paper MGCP is used for controlling VoIP gateways from external call control elements(MGCs) and introduces a method to improve interoperability for various MGC in a gateway based on MGCP. It presents implementation issues to provide the interoperability for MGC dependent parts such as call flows of message encoding, and a system architecture to resolve the issues.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.12A
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• pp.1868-1875
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• 1999

The design of LAI(Local Area Identifier), the first paging area for searching the mobile terminal has a close relation with the performance of paging channel in CDMA cellular network. This paper discussed the performance of the forward channel of IS-95 CDMA standard, known as the paging through the related messages such as call control message, channel assignment message, etc. Modeling and simulation work were conducted to quantify the performance of paging channel in terms of traffic handling capacity and blocking levels. The results shown are based on a specific system call model based on the operating system of cell cite. This serves as illustrative guidelines for the proper engineering of common control channel, which has a major impact on the overall performance of cellular network.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.758-761
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• 2002

Voice of U(VoIP) technology Provides voice service as well as data service via Internet. It has been a promising technology as Internet grows fast and the requirements are increasing. Recently, serveral protocols have been created to allow telephone calls to be made over IP networks, notably, SIP and H.323. Due to introducing SIP and H.323, There are many change at internet telephony service. Internet telephony enables a wealth of new service possibility Users can control telephony service directly. In this paper, we design and implementation CPL client based on SIP system.