• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.418-420
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• 2021

In the 21st century, computers are useful tools for our lives. However, such computers are difficult to use because they are inputted with a mouse and keyboard. The goal of this paper is to design and implement a 'foot keyboard' that can be typed using pedals and using the "cheonjiin" input method with minimal foot movement so that even people with impaired hands can use the computer comfortably.

• Journal of Information Technology Applications and Management
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• v.11 no.2
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• pp.179-190
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• 2004

This paper describes the design of hacking prevention systems using a smart card. It consists of two parts, i.e., PC authentication and Keyboard-buffer hacking prevention. PC authentication function is a procedure to handle the access control to the target PC. The card's serial number is used for PIN(Personal Identification Number) and is converted into hash-code by SHA-1 hash-function to verify the valid users. The Keyboard-buffer hacking prevention function converts the scan codes into the encoded forms using RSA algorithm on the Java Card, and puts them into the keyboard-buffer to protect from illegal hacking. The encoded information in the buffer is again decoded by the RSA algorithm and displayed on the screen. in this paper, we use RSA_PKCS#1 algorithm for encoding and decoding. The reason using RSA technique instead of DES or Triple-DES is for the expansion to multi-functions in the future on PKI. Moreover, in the ubiquitous computing environment, this smart card security system can be used to protect the private information from the illegal attack in any computing device anywhere. Therefore, our security system can protect PC user's information more efficiently and guarantee a legal PC access authority against any illegal attack in a very convenient way.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.593-598
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• 2006

웨어러블 컴퓨팅 환경에서 사용 가능한 키보드는 부담 없이 착용할 수 있어야 하며 충분히 빠른 속도로 문자를 입력할 수 있어야 한다. 또한 일반적인 사용자도 특별한 훈련과정 없이 쉽게 사용할 수 있어야 한다. 상용화된 웨어러블 컴퓨팅용 입력장치는 주로 소형화 QWERTY 키보드인데 공통적으로 키 수를 줄이는 방식을 택하고 있다. 그러나 줄이는 키 수에 대응하여 문자 입력을 위한 키 입력 수(KSPC: Key Strokes per Character)가 증가하기 때문에 입력효율이 저하되고 학습을 위한 요구되는 노력이 또한 증가한다. 그럼에도 불구하고 Halfkeyboard, WristPC keyboard, FrogPad 등 상품화된 키보드는 충분히 작은 사이즈가 아니어서 일상적으로 부담 없이 수용하기에는 물의가 있다. 본 연구는 이런 문제점을 해결하기 위해 키 간격을 줄여 극적으로 키보드를 소형화할 수 있는 원키 키보드라는 개념을 제안하였다. 전통적인 키보드의 경우 하나의 키에 하나의 문자가 할당되는데 반해 원키 키보드는 하나의 키 판 위에 10*5 배열의 QWERTY 키보드 문자배열을 표시하게 하였다. 또한 표시된 문자판에서 어떤 것을 선택하여 눌렀는지 손가락의 위치를 센싱하여 해당 문자를 입력하도록 하였다. 70mm*35mm 크기의 원키 키보드에 대한 실험결과 착용성과 사회적 수용성이 우수하였으며 5 세션의 시도를 통해 평균 18.9WPM 의 입력속도와 교정되지 않은 순수 에러율 0.87%를 기록하였다.

• Proceedings of the Korea Contents Association Conference
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• 2006.05a
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• pp.427-430
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• 2006

The advancement of Information Technology has being very quickly accomplished and people have being received a lot of advantage of IT with Internet and etc. But in spite of the development of IT, the handicap persons having physical handicap have a lot of difficulties in using the IT. Among the one of the difficulties is the usage of computer keyboard. It is very difficult for the handicapped persons with physical handicap to use the existent keyboard. Therefore, in this paper, we propose the design and implementation of keyboard that the handicapped persons can efficiently use and that is very based stage for receiving the advantage of IT.

• Journal of Korea Multimedia Society
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• v.20 no.2
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• pp.396-403
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• 2017

In recent years, the use of touch screens has expanded, and devices such as remote controllers have been developed in various ways to control and access contents at long range. The wireless-based touch screen is used in classroom, seminar room, and remote video conversation in addition to the TV remote control. The purpose of the study is to design a smart phone-based intuitive interface that can perform the role of a wireless mouse and a wireless keyboard at range using Bluetooth and to develop an application that integrates functions of a mouse and a keyboard. Firstly, touch interaction model for controlling software such as PowerPoint by connecting to a general PC on a smart phone has been studied. The most simple touch operation interface is used to reproduce the function of existing devices and design more simply. The studies of the extension of interfaces with various functions are important, but development of optimized interfaces for users will become more important in the future. In this sense, this study is valuable.

• The Journal of the Korea Contents Association
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• v.7 no.6
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• pp.79-88
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• 2007

As the mobile computers such as Personal Digital Assistants (PDAs) or Smart Phone has been widespread in our daily life, the demand of an extensive data input will gradually be increased. Consequently, many alternative soft keyboards have been proposed to satisfy this requirement. However none of them can provide an absolute solutions for that, the segregated guideline for keyboard arrangement and usage still cause much confusion to the user. Therefore, an integrated guideline is seriously required. In order to come up with the integrated guideline for Korean Soft keyboard GUI, the questionnaire and the experimental test compared with five soft keyboards were conducted in this study. As a result this paper presents five guidelines for improving an input speed of soft keyboard on the mobile computing; following familiarity for effective screen use, using a single key rather than grouping key, considering position of prediction word, considering prompt feedback, finally, considering optimized keyboard size.

• Journal of Korean Institute of Industrial Engineers
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• v.25 no.4
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• pp.459-465
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• 1999

A new-concept VDT workstation chair with adjustable keyboard/mouse support was proposed to minimize physical discomfort and the risk of cumulative trauma disorders (CTDs) at work sites in this study. First, a three-dimensional human modeling tool $(SAFEWORK^{(R)})$ was used to design the new chair satisfying the anthropometric specifications of Korean population. Second, based upon the result of 3-D graphical simulation, a mock-up chair was constructed with an adjustable keyboard/mouse support directly attached to the chair body. Third, muscle fatigue and subjective discomfort were measured to evaluate the newly developed chair. An experiment was conducted to compare the new workstation chair to the traditional computer chair without keyboard/mouse support. Six volunteer subjects participated in six one-hour word-processing sessions with two different chairs and three different postures. Statistical results indicate that the new-concept VDT chair generally improved subjective comfort level and reduced fatigue in finger flexor/extensor and low back muscle. In conclusion, this new VDT workstation chair is expected to reduce physical discomfort and prevent occupational CTD problems in the long run. Implications of the new design and suggestions for the further development are also addressed.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.1
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• pp.213-218
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• 2023

In order to use the VR HMD, operation through separate controllers in both hands is required. Methods for text input in VR include a method of selecting virtual keyboard keys on the screen one by one using a controller, a method of inputting through a keyboard that is a resource of a computer by connecting a computer and VR, or a method of inputting through a keyboard that is a resource of a computer by purchasing a wireless keyboard in VR and wireless keyboard connection method. As such, the text input method in current VR equipment causes inconvenience and additional costs to users. For these reasons, most of the VR-related contents are limited to simple functions such as games or viewers, and there is a risk that VR equipment will be recognized as a simple game machine. Therefore, in this study, a multi-input interface using hand tracking provided by the Oculus Quest2 device is designed and partially implemented. Through this, it is expected that various tasks such as document work and business processing as well as games can be conveniently used using VR equipment.

• Archives of design research
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• v.12 no.1
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• pp.157-166
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• 1999

With the increase in use of the computer, the VCT syndrome has occured as a new socialJhea/health problem. ErgonomicaI design standards are a for the users to reduce stress and poor physical posture in the human body. In this study. we have suggested design dimensions recommended from previous studies. We also have reviewed users' preference dimenision, and analyzed differences between users' preference dimenision. and the previous design aiteria to verify physical appropriateness. We analyzed how each design dimension was reached and affected the tunan body by objective EMG evaluation. and subjective evaluation of physical discomfort and oorrIort. We have found that keyboard height is very important in a workstation. If the elbow's height is lower than the keyboard's height. it effedS the hand and wrist. If higher, it brings fatigue to the shoulder and neck. As a result of this experiment. we suggested that the height of a keyboard desk for Koreans be 660mm for the fixed type and 540-774mm for the adjustable type. Also other design reoommendations were suggested in the thesis. In ooncIusion, our research will be very important in the database because it provides adjustable ranges to fit user's body types in the various design flekIs.

• Journal of Korean Society for Quality Management
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• v.37 no.4
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• pp.52-60
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• 2009

The North and South Koreas have different standards for computer keyboard designs, though both are two sets type keyboards. We expect that the unified design will be three sets type as the third standard. Korean keyboards of three sets type are classified as 3 modes in this paper, such as limited models, medium models, and extended models. Based on design principles of three sets type, 27, 29, 30, 36, and 38 keys models for a unified standard are suggested.