• International Journal of Internet, Broadcasting and Communication
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• v.11 no.4
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• pp.71-75
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• 2019

Sleep apnea is a disease that causes various complications, and the polysomnography is expensive and difficult to measure. The purpose of this study is to develop an unrestricted wearable monitoring system so that patients can be examined in a familiar environment. We used a method to detect sleep apnea events and to determine sleep satisfaction by non-constrained method using SpO2 measurement sensor and 3-axis acceleration sensor. Heart rate and SpO2 were measured at the finger using max30100. After acquiring the SpO2 data of the user in real time, the apnea measurement algorithm was used to transmit the number of apnea events of the user to the mobile phone using Bluetooth (HC-06) on the wrist. Using the three-axis acceleration sensor (mpu6050) attached to the upper body, the number of times of tossing and turning during sleep was measured. Based on this data, this algorithm evaluates the patient's tossing and turning during sleep and transmits the data to the mobile phone via Bluetooth. The power source used 9 volts battery to operate Arduino UNO and sensors for portability and stability, and the data received from each sensor can be used to check the various degree between sleep apnea and sleep tossing and turning on the mobile phone. Through thisstudy, we have developed a wearable sleep apnea measurement system that can be easily used at home for the problem of low sleep efficiency of sleep apnea patients.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.32 no.7
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• pp.254-260
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• 1983

In this paper a basic design procedure for programmable instruments of IEEE-488 BUS system has been discussed by designing a specific programmable frequency counter with its hardware and software. The designed programmable frequency counter has a programmable range switch and a function of the programable number of measurements. It contains five basic functions(Talker. Listener, Source handshake, Accepter handshake and Controller) of a IEEE-488 BUS and the Device-Trigger as a supplimentary function. The hardware has been built along with 6800 MPU and 68488 GPIA, and its software has included initialization, interrupt handler, BI.GET,BO and controller routines, The designed system given in this paper has been successfuly tested via some experiments.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.6
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• pp.1078-1082
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• 2001

This is an example of ABSTRACT format. We made a HTTP server using 8 bit microprocessor It was TMP84c015 which applied a z80 core and RTL8019AS was installed for an ethernet physical layer. Assembly language was used to optimized a performance of the MPU, to overcome an restriction of memory sire and to maximize the throughput of packet using TCP, UDP, IP, ICMP, ARP protocol. We used LabVIEW to verify the each protocol on the client side.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.64 no.4
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• pp.291-296
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• 2015

Transmission line is exposed to a large area, and then faults are likely to occur than the other component of power system. When a fault occurs on a transmission line, fault locator helps fast recovery of power supply on power system. This paper deals with the design of a digital fault locator for improvement accuracy of the fault distance estimation and a fault occurrence position for transmission line. The algorithm of a fault locator uses a DC offset removal filter and DFT filter. The algorithm utilizes a fault data of GPS time synchronized. The computed fault information is transmitted to the other side substation through communication. The digital fault locator includes MPU module, ADPU module, SIU module, and a power module. The MMI firmware and software of the fault locator was implemented.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1032-1034
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• 1992

There are increasing demands for the Space Power System to get more useful performance. These demands are high-efficiency, high-confidency, light-weight, small-size, and the systems's flexibility which can shorten the development time. These demands can be achieved when we make the use of $\mu$-Processor. This paper, therefore, shows an analysis and experimental results for the Space Power System with MC 68000, Motorola's 16 bits MPU, to find the system's characteristics.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.512-514
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• 2006

본 논문의 목표는 디지털 방송 수신과 아날로그 방송 수신 및 방송 컨텐츠를 녹화, 저장, 재생이 가능할 뿐만 아니라 각종 멀티미디어 컨텐츠를 즐길 수 있고, 양방향 데이터 방송이 가능하며, 저장된 콘텐트를 스트리밍으로 개인 멀티미디어 플레이어로 스트리밍 이 가능한 다기능 일체형 개인 녹화기를 개발하는 것이다. 고품질 디지털 방송과 기존의 아날로그 방송을 고품질의 디지털 컨텐츠로 변환하여 저장하고, 이를 원하는 시점에 언제든지 볼 수 있을 뿐만 아니라 인터넷 접속하여 어디 서든지 개인 형 멀티미디어 플래이어를 이용하여 스트리밍으로 저장된 컨텐츠를 즐길 수 있다. 이러한 기능을 수행하기 위하여 상당한 성능의 MPU가 필요로 하게 된다. 본 논문에서는 이러한 조건을 만족시키기 위하여 Zoran의 G9Ellite라는 SOC를 채택하였다. 개발된 시스템을 테스트하기 위하여 현재 각 방송사들의 방송을 수신하고 요구된 기능을 테스트 하였다.

• Proceedings of the KIEE Conference
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• 2004.07e
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• pp.80-83
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• 2004

Previously, in order to send information from the local controller to the display board, the hardware or software had to be handled and run through 3-phases, which include the PC-card or PC-add Board, I-F card and Sub board. This study will attempt to design a board that handles information by connecting the USB port of the PC directly to the Sub board. In addition, an MPU will be attached to the previously complex hardware circuit to design a software drive engine module, which allows for the development of new products by modifying only the software engine and not the hardware.

• Proceedings of the KIEE Conference
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• 1992.07a
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• pp.397-400
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• 1992

Many dynamic control have been proposed; however, most of them are limited within stage of simulation study. The main reason is that the computations required for inverse dynamics are far beyond the ability of the present commercially available microprocessors. In this paper, In order to achieve real-time processing in robot dynamic control, a parallel processing computer for robot dynamic control is implemented using two transputer. Two transputer compute two degree of freedom robot. The transputer is a special purpose MPU for parallel processing. Transputers are used in networks to build a high performance concurrent system. A network of transputers and peripheral controllers is constructed using point-to-point communication. To gain most benifit from the transputer architecture, the whole system is programmed in OCCAM which is a high level language for concurrent applications. This control algorithm is applied to the RHINO SCARA type manipulator. We could taked about 438.6 microseconds to compute robot dynamic with two-processors.

• Proceedings of the IEEK Conference
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• 2000.11c
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• pp.161-164
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• 2000

This paper presents an implementation of internet gateway system, named AX-2000 and call simulator. AX-2000 plays a important role in internet telephony technology and is composed of various board such as MPU, AVU. DVU, AMU. FXS, FXO, EM. Also AX-2000 supports G.729.a, G.723.1 for voice compression, G3 FAX Relay(T.38) and H.323. A capability of AX-2000 is 8 analog voice channel or 30 digital voice channel. For functional verification of AX-2000 voice interface, call simulator is designed. The call simulator makes actual call path between SUT(system under test) and reference AX-2000 system, then through call path examines functions of voice interface.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1823-1824
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• 2008

We propose a remote controlled robot manipulator using force feedback joystick. User can control easily 5 d.o.f robot manipulator in 3 demensional space using general joystick. A force sensor attached in developed gripper sends signal to main robot controller so as to know gripper grasp the object. The signal also sent to user through force feedback joystick. We designed a dexterous 5 d.o.f robot manipulator analysis the kinematics and inverse kinematics. The robot was simply developed using serial RC motor. As a main robot controller, we use 32bit MPU(AT91SAM7256) and micro C/OS. To show the validity of our developed robot, a several experiments were demonstrated.