• Title/Summary/Keyword: 자이로 프리

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A Study on Position Fixing by Free Gyroscopes (프리 자이로스코프를 이용한 위치결정에 관한 연구)

  • 박석주;정태권
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2004.04a
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    • pp.117-120
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    • 2004
  • This paper is to investigate theoretically position fixing by using gyroscopic inertia of free gyroscope. with respect to a reference position or starting point, the changes of the inclination angle of the spin axes and the elapsed time are taken a measurement. By using the two basic factors like changes of angles a position is fixed.

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LaserPen: a new pointing device for a beam projector (프로젝터를 위한 지시 및 입력 장치인 레이저펜 시스템)

  • 최규완;이기혁
    • Proceedings of the Korean Information Science Society Conference
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    • 2003.04c
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    • pp.573-575
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    • 2003
  • 본 논문에서는 광학 시스템의 대칭성을 이용하여 프리젠테이션시 마우스와 같이 사용할 수 있는 레이저펜 시스템을 제안한다. 성능 평가를 위해 비슷한 상황에서 사용될 수 있는 자이로스코프 타입 포인팅 디바이스, 트랙볼 타입 포인팅 디바이스와 비교 실험한 결과 절대 좌표계를 이용하는 레이저펜 시스템이 가장 우수한 결과를 보였다.

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Development of globe-type radio mouse using gyro sensor (자이로센서를 이용한 장갑형 무선마우스 개발)

  • Kim, Nam-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.8
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    • pp.1721-1728
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    • 2009
  • Future computer interface was interchanged with person's hands or eyes from traditional mouse. In this research, I developed glove type radio mouse using gyro sensor that is replaced mouse cursor movement with persons's hand movement. Introducing a mobile sensor network technology based on bluetooth, radio mouse connected to computer system wirelessly for overcoming wire mouse's activity restrictions. Also, using USB port interface made be easy to install and to use. Developed glove type radio mouse was confirmed in the possibility of using as well as an input pointing device for presentations or games that needed many kinds of user interaction.

Design of 3D Running Game using Gyro Sensor in Mobile Environment

  • Choi, Joo-Young;Kim, Seok-Hun;Kwak, Ho-Young;Kim, Soo Kyun
    • Journal of the Korea Society of Computer and Information
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    • v.26 no.10
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    • pp.77-82
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    • 2021
  • In our society, the current smart devices have been commercialized and more time than most people are in contact with smart devices than the time in contact with the PC, it shows the same trend in terms of the game industry. Thus in the study, it was to try to make a game by utilizing the characteristics of only the smart devices in mobile environments among them by using the gyro sensor implementing the movements of characters. In particular, undergraduate student made various attempts to implement a single game using the sensor used in smart devices. In this paper, we have planned the adventure 3D running game that allows users to easily fun to play. Our goal is to implement one stage. We have discussed that you have designed and implemented.

The Hydraulic Characteristics of Liquid Shotcrete Accelerators within Cement System (시멘트 계에서 액상 숏크리트용 급결제의 수화 특성에 관한 연구)

  • Shin Jin-Yong;Kim Jae-Young;Hong Ji-Sook;Suh Jeong-Kwon;Rho Jae-Seong
    • Journal of the Korea Concrete Institute
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    • v.17 no.6 s.90
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    • pp.1011-1018
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    • 2005
  • The influence of liquid shotcrete accelerators(alkali aluminate, two types of alkali-free) was investigated. Comparing to the existing alkali aluminate accelerator, new alkali-free accelerator, AF2, shortened initial and final setting of cement system, and after curing for 1 day compressive strength was analogous with others. On the other hand, compressive strength of specimen cured for 12 hour was the highest by the addition of alkali aluminate accelerator, but final strength was the lowest by that. But compressive strengths of AF1, AF2 were similar to Plain up to 28day. Further from XRD(X-Ray Diffractometer) and DSC(Differential Scanning Calorimeter) analyses, we confirmed that setting promoted by alkali aluminate was mainly because of Ca(OH)2(calcium hydroxide), but the accelerating behavior of alkali-free was influenced by the needle-like ettringite$(6CaO{\cdot}Al_2O_3{\cdot}3SO_3{\cdot}32H_2O)$ crystal.

Fuzzy Inference System for Data Calibration of Gyroscope Free Inertial Navigation System (Gyroscope Free 관성 항법 장치의 데이터 보정을 위한 퍼지 추론 시스템)

  • Kim, Jae-Yong;Kim, Jung-Min;Woo, Seung-Beom;Kim, Sung-Shin
    • Journal of the Korean Institute of Intelligent Systems
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    • v.21 no.4
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    • pp.518-524
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    • 2011
  • This paper presents a study on the calibration of accelerometer data in the gyroscope free inertial navigation system(GFINS) using fuzzy inference system(FIS). The conventional INS(inertial navigation system) which can measure yaw rate and linear velocity using inertial sensors as the gyroscope and accelerometer. However, the INS is difficult to design as small size and low power because it uses the gyroscope. To solve the problem, the GFINS which does not have the gyroscope have been studied actively. However, the GFINS has cumulative error problem still. Hence, this paper proposes Fuzzy-GFINS which can calibrate the data of an accelerometer using FIS consists of two inputs that are ratio between linear velocity of the autonomous ground vehicle(AGV) and the accelerometer and ratio between linear velocity of the encoders and the accelerometer. To evaluate the proposed Fuzzy-GFINS, we made the AGV with Mecanum wheels and applied the proposed Fuzzy-GFINS. In experimental result, we verified that the proposed method can calibrate effectively data of the accelerometer in the GFINS.

A Study on Properties of High Blaine Cement for Shotcrete (숏크리트용 고분말도 시멘트의 특성)

  • Kim, Jae-Young;Kim, Teuk-Jun;Lee, Min-Suk;Ryoo, Dong-Woo
    • Journal of the Korea Concrete Institute
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    • v.22 no.5
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    • pp.633-640
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    • 2010
  • This study was performed to get basic information about properties of high blaine cement for shotcrete use. Particle size distribution, setting time and compressive strength test, analysis like as SEM, DSC thermal analysis, XRD was carried out to investigate principle properties of high blaine cement. Setting time of high blaine cement was shorter and compressive strength was higher than those of ordinary portland cement (OPC). Results of analysis showed early hydration products of high blaine cement is smaller and spread widely due to increased specific surface. From the SEM observation and analysis of DSC and XRD results, it was seen that the aluminates accelerators promoted calcium aluminium hydrates while the alkali free accelerators increased ettringite and monosulfates formation. Strength and setting time measurement of cement paste with aluminate accelerator is more effective than the alkali free accelerator in reducing the setting time and increasing early strength while alkali free accelerator is more effective in increasing the strength after 7 days.

Implementation of π/4-DQPSK Modem for Maritime Digital Communication in VHF Band (VHF 대역 해상 디지털 통신용 π/4-DQPSK 모뎀 구현)

  • Kwak, Jaemin
    • Journal of Advanced Navigation Technology
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    • v.18 no.6
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    • pp.541-545
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    • 2014
  • Rec. ITU-R M.1842-1 is international recommendation for VHF band communication guideline in maritime mobile service RR Appendix 18 channels. In this paper, we simulate 28.8 kbps VHF ${\pi}$/4-DQPSK digital baseband modem compatible with the recommendation, then it is designed and implemented with FPGA. Cazac sequence is used as a preamble since packet format is not defined untill now in the recommendation. Baseband modem is designed by VHDL language and implemented on NEXYS4 development platform having Atrix7 FPGA chip from Xilinx. For wireless communication test of total prototype system, ADC/DAC board is implemented and EV9730 RF module is utilized. From the experimental results, implemented FPGA modem shows spectral bandwidth of 25 kHz and successful data exchanges between tx and rx communication platform.