• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1638-1641
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• 2010

본 연구에서는 디스플레이 공간이 협소한 스마트 폰의 제약을 극복하고자 적외선 카메라를 이용한 입력 인터페이스를 제안한다. 제안하는 방식의 특징은 기존의 사용자의 손이나 펜을 이용한 입력 방식이 아닌 카메라를 통해 적외선 펜의 위치를 인식하고 추적하여 입력 공간의 크기에 제약을 받지 않고 사용하는 방식이다. 실험 결과 기존의 스마트 폰의 터치스크린을 이용한 입력 방식보다 더욱 편리하고 효율적인 입력도구로 사용될 수 있음을 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.182-185
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• 2008

테이블 탑 디스플레이는 사람에게 친숙한 상호작용의 수단인 손을 인터페이스 수단으로 이용하는 일종의 탁자형 터치스크린이다. 본 논문에서는 이러한 환경에서 사용자 독립적인 온라인 필기 숫자를 인식하는 연구를 수행하였다. 이로 인해 추후 진행될 다중 사용자의 한글, 영문, 특수기호의 인식 가능성을 확인하였다. 실험 과정은 테이블 탑 디스플레이의 표면을 통해 입력된 사용자별 손가락 궤적으로 기준점을 잡고, 각 사용자별 필기궤적에서 대표점 추출과 16-방향 체인코드변환을 수행하였다, 변환된 체인코드의 학습 및 필기숫자 인식에 확률 통계적 모델인 은닉 마르코프 모델을 이용하였다. 실험에 사용된 데이터는 총 300개의 데이터를 사용 하였고, 학습은 10회 복제하여 총 3000개의 데이터로 수행하였다. 각 사용자별 데이터를 100개씩 인식 실험에 사용하여 각각 93%, 94%의 정인식율을 보였다.

• KIPS Transactions on Software and Data Engineering
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• v.2 no.3
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• pp.151-160
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• 2013

iOS applications refer to the apps operating on iOS, a mobile OS developed by Apple. As iOS provides graphic user interfaces based on touch screens, most of iOS apps support GUIs. GUIs become increasingly important for iOS apps. So are GUI tests. As GUI functions are performed by event handlers, faulty event handlers could cause defects in GUIs. Hence, this study detects faults in event handlers as a way to test GUIs for iOS apps, and suggests how to generate test cases by re-defining input domains of event handlers.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.6
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• pp.279-283
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• 2012

In is paper, we design and implement the low power, high speed touch screen controller that calculates and outputs the coordinate of touch point on the touch screen of mobile devices. The system clock is 10HMz, the number of input channels is 21, standby current is $20{\mu}A$, dynamic range of input is 140pF~400pF and the response time is 0.1ms/frame. It contains the power management unit for low power, automatic impedance calibration unit in order to adapt to humidity, temperature and evaluation board, adjacent key and pattern interference suppression unit, serial interface unit of I2C and SPI. The function and performance is verified by using FPGA and $0.18{\mu}m$ CMOS standard process. The implemented touch screen is designed for using in the double layer ITO(Indium Thin Oxide) module with diamond pattern and single layer ITO module for cost-effective which are applied to mobile phone or smart remote controller.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.1
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• pp.135-141
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• 2011

Recent advances in mobile devices and development of various mobile applications dealing with private information of users made user authentication in mobile devices a very important issue. This paper presents a new user authentication method based on touch screen interfaces. This method uses for authentication the PIN digits as well as the exact locations the user touches to input these digits. Our method is fully compatible with the regular PIN entry method which uses numeric keypads, and it provides better usability than the behavioral biometric schemes because its PIN registration process is much simpler. According to our experiments, our method guarantees EERs of 12.8%, 8.3%, and 9.3% for 4-digit PINs, 6-digit PINs, and 11-digit cell phone numbers, respectively, under the extremely conservative assumption that all users have the same PIN digits and cell phone numbers. Thus we can guarantee much higher performance in identification functionality by applying this result to a more practical situation where every user uses distinct PIN and sell phone number. Finally, our method is far more secure than the regular PIN entry method, which is verified by our experiments where attackers are required to recover a PIN after observing the PIN entry processes of the regular PIN and our method under the same level of security parameters.

• Journal of Korea Multimedia Society
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• v.12 no.10
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• pp.1363-1373
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• 2009

In a ubiquitous computing environment, people more and more become to use multiple displays. When using such ubiquitous displays, it is needed for users to seamlessly interact with the displays for a certain content. In this paper, we propose a seamless interface that allows users to see photos across multiple displays. Many photos can be displayed on a screen at the same time because they are shown in 3D space. And a group of photos is represented using a cube metaphor. A user can manipulate photos directly using a touch screen and also see the photos continuously using PDAs when the user moves to other places. In addition, the user can interact with the photos seamlessly using another display. The developed system was designed to interact according to user's movements and not to draw user's attention too much as a kind of ambient display. Using RFID and ultrasonic sensors it recognizes a user and the user's proximity to the display, and then automatically determines the screen image and the user interface accordingly.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.2
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• pp.157-166
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• 2004

Recently, switchboards for MV/LV distribution customers have been united and digitalized rapidly. This paper suggestes the effective information visualization method for the data mesured from cubicle switchboard for MV/LV distribution customers. We developed the algorithm that analyzes a large number of mesured data and displays them to users overall, such as fire index, power condition index, switchboard safety index, and power diminution index. Using a touch screen made users to operate it easily. User interface was also strengthened by taking graph visualization. We guess the information visualiztion method suggested in this paper shows the new direction that heavy electrical equipments including switchboards are going to develop in the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.3
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• pp.236-240
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• 2004

We have implemented image monitoring system on PXA255 processor based embedded board that is ported QT/Embedded 2.3.7 version. User is able to monitor camera's capture image for widely separated host PC at client PXA255 board target board by ethernet communication method. And we designed PCI interface card that control motor for camera's Pan & Tilt. Bitmap format's images of $320\times{240}$ size are displayed on PXA255 board's TFT-LCD and User is able to monitor wanted position's image by touch screen input method.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.569-572
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• 2008

I proposed wireless ordering system using Qt embedded. This system will make the good use of real life applications and make fit for practical use. I embodied data input, transfer, gathering and back-transfer on wireless network using TCP/IP protocol on QSocket provided by Qt. Server environment is Linux 9.0 and gcc-2.95.3 on PC, and three target-boards consist PXA255 processor with wireless-LAN card which communicate through wireless access pointer. Software tools on target-board are gcc, tmake, qt-X11, qt-embedded and etc. I designed touch-screen interface for user convenience.

• Journal of KIISE:Software and Applications
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• v.27 no.11
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• pp.1133-1140
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• 2000

다중모드 대화에서 나타나는 대용어는 언어만을 사용하는 대화에서 나타나는 것과 비교하여 매우 다른 형태와 특징을 가진다. 그것은 행위나 시각이 대용 행위로 사용될 수 있기 때문이다. 본 논문에서는 터치스크린 인터페이스를 이용한 홈쇼핑 가구점 영역의 다중모드 대화 시스템에서 나타나는 다양한 대용어의 처리 방법을 알아본다. 먼저, 화면 대용어와 참조 대용어를 정의하여 다양한 형태의 대용어를 분류한다. 그리고 각 대용어를 처리할 수 있는 두 가지의 일반적인 방법을 제안한다. 하나는 지시 행위를 수반하거나 생략한 채 발화되어 현재 화면에 나타나 있는 아이템을 참조하는 대용어를 처리하는 단순한 매핑 알고리즘이다. 다른 하나는 다중 모드 대화 시스템을 위해 워커(Walker)의 센터링 알고리즘을 확장한 이중 캐시 구조의 센터링 알고리즘이다. 확장된 센터링 알고리즘은 발화와시각 정보 그리고 화면 전환 시간을 유지할 수 있기 때문에 다중모드 대화에서 발생하는 다양한 대용어를 처리하기에 적합하다. 실험에서 제안된 시스템은 40개의 대화에서 나타난 402개의 대용어(발화당 0.54)중에서 387개를 처리하여 96.3%의 정확도를 보였다.