• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.262-268
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• 2008

Recently, as the demand for multimedia services based on the wireless technologies and mobile devices increases, Full-touch screen mobile devices adopting touch screen keyboards are emerging to cope with the limited display size and take advantage of the flexibility in the design of user interfaces. However, the text entry task, which is one of the main features of the mobile devices, decreases the competitive advantages of the touch screen keyboards over the physical keyboards or keypads due to the lack of physical feedbacks and the frequent occurrence of mistyping. This study aims to introduce a novel text entry method named Fuzzy Touch and compare this method with the conventional text entry method on a touch screen keyboard in terms of the performance (time, number of touch) and the subjective ratings (ease of use, overall preference).

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.11
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• pp.866-870
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• 2009

As touch-screen mobile phones pour into the market, demands for reusing existing mobile game contents by adding a touch-screen interface are increasing. But, the contents which are developed in existing does not have touch-screen interface and in order not to be automatic is difficult with touch- screen contents to convert. From the present paper uses keyboard interface information about the mobile game contents which does not have touch-screen interface and creates touch-screen interface with automatic the method which proposes. This method analyzes the type of key events which are used from the contents the screen keyboard layout of optimum and construct. And, key event where is confronted with automatic occurs about touch screen event and creates the screen interface which executes the keyboard event handler. In the end, experiment leads and the screen interface which has become optimum anger to the contents creating, confirms.

• IE interfaces
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• v.20 no.4
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• pp.539-546
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• 2007

This study has been conducted on touch screen interface design for mobile devices. It was intended to measure user’s satisfaction on one-handed thumb input mobile devices. Recent studies proposed the optimal touch button size, but it is inappropriate for mobile devices. Therefore, this study was focused on four touch key factors-width, height, the horizontal and vertical distance between touch keys-as independent variables. The ANOVA results showed that the user satisfaction of four touch key factors was significantly affected by the thumb input. It also apparent that the interactions between four factors were significant. As a result, the horizontal and vertical distance as well as the width and height affected the satisfaction of users. In addition, this study suggested satisfaction models which represent the top 30%, 50%, 70% of user satisfaction measurement. The results of this study could be used to design touch keys that are able to enhance the usability on touch screen based mobile devices.

• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.173-178
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• 2008

Due to a rapid increase in demand for bigger-screen-equipped mobile phones in recent years, many big-name-manufactures have been releasing touch-screen-enabled devices. In this paper, various touch-screen-input methods have been summarized into 6 different categories. How? By tracing each user's finger print path, user's input pattern and behavior have been carefully recorded and analyzed. Through this analysis, what to be considered before designing UI is presented in great details.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.2
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• pp.141-146
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• 2014

This paper describes the implementation and algorithm of handwritten character recognition using mobile touch screen. The system is consisted of PXA320 processor, capacitive touch panel and QT4 interface. The proposed algorithm extracts pattern characteristics with straight, left circle, right circle on the inputting character. The definition of character is determined by 3-way tree searching method. The performance of proposed algorithm is verified using alphabet character. It is suitable to apply the mobile touch screen because of simple algorithm.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.584-589
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• 2008

The in put system using the touch screen directly makes the input signals by the contact on the screen without the assistance of peripherals such as a pen or hands. These kinds of input systems using the flexible hands is maximizing suppleness and intuition of the input rather than those systems using a keyboard or a mouse which are moving a cursor or typing a word. However, using hands for an input may give rise to a mistake in control. And there are few interfaces utilizing the touch screen. Incorrectness and insufficiency of the interface are the weak point of the touch screen systems. In this paper, we propose the dial menu user interface for the mobile devices using touch screen for an efficient input. In this method, it consists of 2 states(Inactive states, Active states) and 4 actions(Rotation, Zoom in, and Zoom out, and Click). The intuitive control utilizing the suggested method overcomes the incorrect pointing, weak point of the touch screen system, and boosts the searching menu by utilizing the drag function of the touch screen.

• The Journal of the Korea Contents Association
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• v.10 no.1
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• pp.138-146
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• 2010

Currently mobile phones possess the new features including the control interface provided with an ease, an intuition, and a variety and the display ensured for wide area. Mobile phones mounted with the touch screen release actively due to such strengths. This is the mega trend of the development of the latest mobile game. Mobile games set to the past keypad input system have changed for adaptation in the input environment and the progressive development. Consequently it is necessary to research for 'Touch User Interface(TUI)' of mobile games fixed into input environment by "Touch screen". This study have concreted the application method of touch game through the comparison analysis with the past game and implemented touch mobile game based on usability for ten touch mobile game titles released from the inside and outside of the country in oder to apply the touch interface fixed in the game to the hand-hold device with the function of touch interface. The result of this study have two implications. First it enhances the playability and diversity of game genre restricted by reason of the limitation of the past keypad input device. Second, it utilizes the basis for the standard of the interface of the touch mobile game by genre.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.16-18
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• 2012

이 논문은 멀티프로세싱으로 인해서 발생할 수 있는 touch screen polling I/O 성능 이슈를 다루고 있다. Touch screen이 장착된 휴대용기기가 점차 대중화되고 그 편한 사용성 만큼이나 쉽게 익숙해지고 있다. 하지만, 휴대용기기내에서 여러 가지 작업(multiprocessing or multitasking)을 동시에 처리하면서 생기는 문제들 중에 touch screen의 반응이 의도하지 않은 동작결과로 나타나는 경험을 하게 된다. 이 논문에서 이러한 부분에 집중하여 우선순위가 높은 다른 작업(process or task)과 동시에 touch screen 처리과정을 분석하여 개선책을 제안코자 한다. 또한 우리는 이러한 개선책을 증명하기 위해서 실제 구현을 통해서 확인한다. 개선된 방법은 이 상황과 비슷한 조건에서 활용이 가능할 것으로 판단한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.1
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• pp.155-159
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• 2014

In this paper, we describe algorithm and digital circuit implementation of touch screen controller that has the faster response time. We enhance the response time by adaptive search method instead of linear search method of step level in the pulse width decision. The faster response time might bring effects of feeling better in the touch keyboard. The performance of the proposed algorithm and function is verified by using logic simulation and FPGA test board. It is expected to use in the mobile touch screen.

• 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.