• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1998년도 하계학술대회 논문집 G
• /
• pp.2405-2407
• /
• 1998

Implementation of a process control language for a pager manufacturing is dealt in this paper. The pager manufacturing process is consisted of a tune and an exam part. In the tune part, three capacitor trimmers are tuned to optimize the state of the pager. In the exam part, message receiving status with the arbitrary calling is tested using a vision system. The program has the ability to reuse the address discarded in the exam part when the, pager testing is not working properly even though there exist the processing gaps between two processes. The system is composed of a personal computer(PC586) and TEM-cells, Flex pager testers, an oscilloscope, a camera, and actuators. Visual Basic running on the Windows 95 is used to implement the control software which has the GUI to make an operator convenient. The validity of applying the completed program to practical machines, which are developing in the KITECH, is shown by using the virtual machine.

• 정보학연구
• /
• 제3권2호
• /
• pp.87-95
• /
• 2000

본 논문에서는 단방향 무선호출의 한계를 극복하기 위한 한 방법으로서 대두되고 있는 양방향 무선호출 시스템을 구성하는 방법에 대하여 연구하였다. 양방향 시스템을 구성하는 방법으로 지금 현재 무선호출시스템을 최대한 이용할 수 있는 방법에 대하여 연구하였고, 이를 바탕으로 시스템을 구성하였다. 제안하는 방법으로 지금까지의 하향 링크로는 지금까지의 무선호출방식을 그대로 이용하였으며 상향 링크에서는 비컨이 장착된 무선호출기와 TRS를 이용하였다.

• 한국산업융합학회 논문집
• /
• 제4권3호
• /
• pp.289-294
• /
• 2001

In this paper a POCSAG receiver interface circuit for wireless remote control using pager system is presented. SM8212A and AT89C51 chips are used for the core of system design. The proposed system is able to communicate with computers through RS-232C interface, which enables users to manage the data from the pager system on computers in real time. Analysis of SM8212A for Ole algorithm of CPU control program is described. The hardware is implemented on a PCB and the control program is made by C++ and assembly language. The performance of designed system is confirmed by experiments using the TESCOM equipments.

• 전자통신동향분석
• /
• 제4권4호
• /
• pp.34-46
• /
• 1989

Paging system이란 전화망 등의 전송매체를 통하여 Pager를 소지하고 있는 가입자에게 호출이나 데이터 서비스를 제공하는 것을 말한다. 국내의 경우 161.42MHz의 carrier frequency를 사용하여 전국을 8개의 지역권(1)으로 분할하여 Paging service를 제공하고 있다. 본고에서는 시스팀 차원이 아닌 단말기 차원에서 Pager의 구성부품들과 각 구성품의 기능들을 파악하였고 pager의 국내 생산 기술 현황을 조사 정리 하였다.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 1999년도 추계종합학술대회
• /
• pp.93-97
• /
• 1999

본 논문에서는 앞으로 국내에서 상용화 될 양방향무선호출에 대한 시스템의 구조 및 그 특징들을 살펴보고, 제외국에서 운용되는 시스템과 비교 분석하였다. 그리고 양방향무선호출에 대한 가능한 서비스 특징과 추후에 진화/응용될 수 있는 서비스 종류를 기술하였다. 그리고, 전파의 질에 관련된 기술기준을 제시하고자 한다.

• 전자공학회논문지S
• /
• 제34S권3호
• /
• pp.1-11
• /
• 1997

Since the radio spectrum is limited, future wireless system will have micro cellular architecture in order to provide multimedia traffic services on personal communicatons network. The small coverage area of micro cellular systems results in frequent hadnoffs and location updates. We focuse on network load and terminal power due to frequent location updates and propose a location tracking scheme using embedded-pager PCS terminals. The proposed scheme is expected to minimize theconsumption of PCS terminal powr and improve the receiving rate of callee because of the power saving mechanism and the embedded-pager PCS terminal. This paper proposes signaling flows among the network elements for the proposed location tracking scheme. The signaling flows are accomodated to not only the existed network architectures but alsothe ATM backbone network arcitecture. To verify the signaling flows, we used petri-Net model. The resutls show that the signaling flows are suitable to our proposed location tracking scheme.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 1998년도 추계종합학술대회 논문집
• /
• pp.487-490
• /
• 1998

In this paper, we describe a method for two-way communication service for smart phone integrated with pager which receive various kinds of Internet service information and pushes this information into smart phone to make it available for Internet assess. In this method, the server can push the status data of message boxes into the smart phone and it makes connection to the server automatically. The proposed method will make it possible to manage and excange the information and resources in an efficient manner during idle time, and will provide the potential capabilities of developing a variety of new Internet services for the system.

• 디지털산업정보학회논문지
• /
• 제11권1호
• /
• pp.19-25
• /
• 2015

In this time, as an industrial society developed to a welfare society, more and more people want their quality of lives upgraded and specially customized service by mass production/mass consumption. And it leads to an increase of requiring service. There're active developments and studies on various IT equipment as the requirement made IT devices used in service. In this paper, we try to design and realize radio paging DID by using smart device to be used as a receiver of a radio pager which is broadly used at face to face service. Firstly, we used MCU to design and implement Wireless Calling Gateway which change radio calling signal of ISM band to smart device. A receiver of wireless caller used original receiver module. Also it used bluetooth module to communicate with smart device. It was possible to have satisfactory communication since radio paging signal converter and smart device were linked in 3M. Secondly, to indicate various paging information delivered from a radio pager, we realized DID application program by using Smart PAD. As a result, we could indicate various information compared to an original receiver which only could indicate letters or numeric data. Secondly, we implemented the DID app for wireless calls that can display a variety of information sent from a wireless pager. Was implemented using the Smart Pad. As a result, it is shown that can display a variety of information than the existing receiver.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 1998년도 추계학술대회 논문집
• /
• pp.226-232
• /
• 1998

In this pager, we present IGBT VVVF inverters as a 1C1M propulsion system for electric car. This inverters are composed of high power IGBT's and controlled by compact control units. The control unit performs full digital control by using 32bit DSP and microconteroller. By using CAN-bus, high speed network is constructed within tow control units. The stack is simplified and optimized by using plate bus and IGBT driver units of hybrid-type.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 1999년도 전력전자학술대회 논문집
• /
• pp.118-121
• /
• 1999

In this pager, we studies IGBT VVVF inverter for 1C4M propulsion system of railway traction. This inverter is consisted in inverter stack, DB unit, and control unit. To prove performance of inverter carry out combine test. This test verifies that performance of inverter is excellent.