• Journal of Advanced Navigation Technology
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• v.14 no.3
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• pp.452-458
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• 2010

In case of an embedded system with computing resource restrictions such as system power and cpu, the overhead due to displaying data on the computer screen may have a significant influence on the system performance. This paper describes an initialization method for LCD-driving components such as an ARM Core, an LCD controller, and an SPI(serial peripheral interface). It also introduces a pixel display function and a panel display method using virtual screen for reducing the display overhead for an LN2440SBC system with an ARM9-based S3C2440A microprocessor. A virtual screen is a large space of computer memories allocated much larger than those needed for one-time display of an image. Displaying a specific region of a virtual screen is done by assigning it as a view-port region. Such a display is useful in an embedded system when concurrently running tasks produce and display their respective results on the screen; it is especially so when the execution result of each task is partially modified, instead of being totally modified, on its turn and displayed. If the tasks running on such a system divide and make efficient use of the region of the virtual screen, the display overhead can be minimized. For the performance comparison with and without using the virtual screen, two different images are displayed in turn and the amount of time consumed for their display is measured. The result shows that the display time of the former is about 5 times faster than that of the latter.

• Journal of the Korea Computer Graphics Society
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• v.27 no.3
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• pp.43-53
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• 2021

This paper presents an interactive wind system that generates artificial winds in a virtual reality (VR) environment according to online user inputs from a steering wheel and an acceleration pedal. Our system is composed of a head-mounted display (HMD) and three electric fans to make the user sense touch from the winds blowing from three different directions in a racing car VR application. To evaluate the effectiveness of the winds for reducing VR cybersickness, we employ the simulator sickness questionnaire (SSQ), which is one of the most common measures for cybersickness. We conducted experiments on 13 subjects for the racing car contents first with the winds and then without them or vice versa. Our results showed that the VR contents with the artificial winds clearly reduce cybersickness while providing a positive user experience.

• Digital Contents
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• no.4 s.95
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• pp.34-37
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• 2001

웹검색의 어둡고 먼 과거로 거슬러 올라가면 HotBot가 스크립티드 파워 검색 기능에 대한 특성의 검색엔진으로서 최고 권위를 휘두르고 있었다. 그 초기 형태들 중 하나의 경우 검색자가 HotBot 검색 형태에 대한 옵션 중 어떤것이 디스플레이되어야 하는지를 선택할 수 있었다. 쿠키 파일에 검색자 컴퓨터상의 이런 환경설정이 저장된다는 것은 검색자가 HotBot를 재방문할 때마다 그가 선호하는 검색 옵션이 나타난다는 것을 의미한다.

• The Journal of Korean Association of Computer Education
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• v.11 no.6
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• pp.95-102
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• 2008

In this paper through the implementation of cooperative learning using SDG, education puzzle actually applies to computer training. SDG(Single Display Groupware) which one computer display have a multi-input devices can work as a collaborative system. Learners are performing together through SDG-based cooperative learning system. SDG cooperative learning with a multi-input device is superior to traditional learning with individual. We have implementation of the puzzle game with this fact. This system through effective education and raising their children's education participation rate will be able to do.

• Annual Conference of KIPS
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• 2021.11a
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• pp.426-428
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• 2021

반도체 디스플레이 기술과 정보통신 기술의 발전으로 디지털 사이니지는 기존의 단순 옥외 광고매체에서 탈피하여 이용자 맞춤 광고나 정보를 제공 및 스마트폰과 연동하여 콘텐츠 제공 가능한 시스템으로 발전하고 있다. 본 연구에서 디지털 사이니지의 작동오류의 위험성을 낮추며 비용절감을 할 수 있도록 제어 서버의 역할을 축소시키고 엣지 영역으로 서버의 역할을 최대한 분담하는 서버리스 기반 디지털 사이니지 시스템 구축 가능성에 대해 연구한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.403-405
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• 2022

본 논문에서는 4차 산업에서 필요로 하는 스마트 기기의 소형 및 저전력 부품에 사용되는 센싱 플랫폼을 제안하였다. 특히 스마트팩토리의 공장 자동화와 정밀 측정의 핵심 부품인 리니어 모션 가이드(LM Guide)를 고정밀, 고정도로 제어할 수 있는 센싱 시스템을 개발하였다. 이를 위하여 기존의 변위 센서 기법의 한계를 극복할 수 있도록 와전류(Eddy Current) 기법을 이용함으로써 LC 공진기와 전도체를 LM 가이드에 장착할 수 있도록 구현하였다. 또한 미세 인덕턴스 값을 측정할 수 있도록 디지털 신호처리 기술과 컴퓨터/산술 기술을 FPGA를 이용한 HW 시스템을 제작하여 구현함으로써 실험을 진행했다. 본 논문에서 구현한 HW 센싱 시스템을 이용하여 LM 가이드를 동작시킴으로 실시간으로 변위 값을 디스플레이 부로 출력되어 측정이 가능하고, 변위 값의 분해능과 응답속도 면에서 우수함을 확인할 수 있다.

• Journal of the Korea Computer Graphics Society
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• v.22 no.3
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• pp.75-87
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• 2016

Virtual reality exposure therapy (VRET) has been used for a several decades. However, we are not aware any studies that used a smart-phone based virtual reality techniques. In this study, we suggested a new smart-phone based VRET that included photorealistic techniques. We also evaluated the current system with 32 healthy participants, and results suggested that the current system evoked different emotional valences in indoor/outdoor and familiar/unfamiliar environments. The meaning of current results and potential applications of VRET were discussed.

• Journal of the Korea Society of Computer and Information
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• v.12 no.6
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• pp.77-87
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• 2007

This paper sets a goal at developing an intelligent advertising system that displays only an advertisement in which interests passers by collecting their RFID information and analysing it in order to improve the defect of outdoor advertising boards which unilaterally advertise regardless of people's interest. For this purpose, we propose a RFID contents middleware which generates a meaningful event and streams an advertising content corresponding with the passers' interest after filtering and analysing the recognized RFID data. We implemented the RFID middleware with Sun Java RFID software and made an experiment by designing a RFID emulator. As a result of the experiment. we found that this system displays the advertisement according to the passers' information.

• Journal of the Korea Society of Computer and Information
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• v.19 no.5
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• pp.79-87
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• 2014

In this paper, we propose contents sharing model for consolidating distributed collaboration environments. We provide the combined model by integrating different features-scalable resolution display walls resource, sharing contents on local and remote, multi-user interaction, and access control. There is a benefit that every user can interact within an environment, but overlaps would occur because of multi-user interaction. To manage overlap issue, the model includes access control. Access control would interfere flow of work process. Therefore, we conduct user study to evaluate these two factors of the model. The result shows that the proposed contents sharing model makes it possible to concentrate in a work.

• Journal of the Semiconductor & Display Technology
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• v.16 no.3
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• pp.71-77
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• 2017

As the automobile industry has shifted to software, the Automotive SPICE standard has been established to ensure efficient product development process and quality. In the assessment model, the HIS Scope is the minimum standard for small and medium automotive electric companies to meet OEM requirements. However, in order to achieve the HIS Scope, the output of each process stage that meets the verification criteria of Automotive SPICE must be created. In particular, the test phase takes a lot of resources, which is a big burden for small and medium-sized companies. In this paper, we propose a methodology for creating test cases of software integration test phase based on UML sequence diagram, which is a software design phase of Automotive SPICE HIS Scope, by applying behavior model based testing method. We also propose a tool chain for automating the creation process. This will reduce the resources required to create a test case.