• Journal of the Korea Society of Computer and Information
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• v.20 no.7
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• pp.57-64
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• 2015

In this paper, we propose a design of microwave motion detector using X-band doppler radar sensor to minimize the power consumption. To minimize the power consumption and implement battery operated system, pulse input with 2 KHz, 4% duty cycle is exerted on the doppler radar sensor. In order to simplify the process of working with ATmega2560 microcontroller unit, Arduino compatible board is designed and implemented. Arduino is open source hardware and many library software is published as open source tools. Smartphone app is also proposed and designed as a real-time user interface of the motion detector. The SQLite database on the Android mobile operating system is used for recording raw data of motion detection for post-processing job, such as fast Fourier transform (FFT). Bluetooth interface module is implemented on the motion detection board as a wireless communication interface to the smartphone. The speed of human movement is identified by post-processing FFT.

• Journal of Korea Multimedia Society
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• v.10 no.11
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• pp.1460-1471
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• 2007

A 3-Dimensional engine in a mobile embedded device is divided into a C-based OpenGL/ES and a Java-based JSR184 which interprets and executes a byte code in a real-time. In these two standards, the JSR184 supporting Java objects uses more processor resources than an OpenGL/ES and thus has a constraint when it is used in an embedded device with a limited computing power. On the other hand, 3-Dimensional contents employed in existing personal computer are created by utilizing advantages of Java and secured numerous users in European market, due to the good quality in contents and extensive service in a commercial network, GSM. Because of the reason, a mobile embedded device used in a GSM network needs a JSR184 which can provide an existing Java-based 3-Dimensional contents without extra conversion processes, but the current version of Java-based 3-Dimensional engine has drawbacks in application to commercial products because it requires more computing power than the mobile embedded device. This paper proposes a binding technique with the advantages of Java objects to improve a processing speed of 3-Dimensional contents in limited resources of a mobile embedded device. The technique supports a JSR184 standard interface in the upper layer to utilize 3-Dimensional contents using Java, employs a different code-conversion language, KNI(Kilo Native Interface), in the middle layer to interface between OpenGL/ES and JSR184, and embodies an OpenGL/ES standard in the lower layer. The validity of the binding technique is demonstrated through a simulator and a FPGA embedding an ARM.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.223-225
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• 2004

최근 뛰어난 성능의 모바일 기기들이 많이 사용되고 있으며 특히나 GIS를 통해 다양한 공간 질의의 서비스 사용이 많아지고 있다. 본 논문에서는 GUS 서버의 전반적인 시스템 구조와 데이터 관리기의 설계 및 구현, 서버 및 PDA 기반 클라이언트의 사용자 인터페이스 등에 대해 소개하고자 한다. 데이터 관리기는 데이터를 객체화하거나 바이트 배열화하고 데이터의 안전한 백업을 보장하는 등의 중요한 역할을 한다. 또한 사용자가 보다 쉽고 자유롭게 질의를 작성할 수 있는 사용자 인터페이스를 구현하였다.

• Journal of Information Processing Systems
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• v.7 no.2
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• pp.355-362
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• 2011

Since two-way interactive broadcasting service began, remote controls have been fitted with 4 color buttons, which enables interaction and convenience to increase between users and content. Currently, diverse studies on IPTV are in progress. Particularly, as the mobile market rapidly grows, studies on mobile IPTV and on linkage with other media are constantly increasing. However, mobile IPTV has never been studied until now. In that sense, this present study attempted to design a mobile-based IPTV UI that could use a multi-dimensional search method based on consistent criteria for content search. As a result, the proposed IPTV UI is fitted with more usability and functionality for 4 color buttons. The UI designed in this study was compared to the IMDb Android Application, which uses GOMS-KLM. The results showed that the performance process was reduced by three stages, and that the performance time was reduced by more than 17.9%. Therefore, the conclusion can be reached that the proposed UI is effective for a fast search of contents.

• Journal of the Korea Society of Computer and Information
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• v.15 no.3
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• pp.19-26
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• 2010

The most critical element in the real-time operation of RFID application programs that are suitable for the mobile environment is the RFID middleware, made exclusively for mobile handsets, which processes collected data on a real-time basis and sends only the useful information to the application client. In this paper, we intend to design and implement the Pet management system for optimized mobile RFID middleware that supports real-time data processing. The proposed Pet management system consists of registration module, retrieval module, communication module, and display module in order to display retrieval result from server. Also, the captured data in the PDA is transmitted to the server and another client system using the mobile application interface that supports the SOAP application access protocol.

• Journal of the Korea Convergence Society
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• v.8 no.12
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• pp.221-226
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• 2017

This study investigates the user experience about the camera application and the operation environment that share the photographed pictures with the SNS in a smartphone user environment which is a necessity of modern people. To do this, 10 task tasks were selected based on 3 aspects such as manipulation, editing, and sharing, and the task execution time was measured after tasks were performed on 8 persons, 4 persons in 20s. Experiments conducted mainly on Samsung Experience 8 and LG UX 6.0, which are representative user interfaces of Android mobile operating system, showed that there are differences in usability between the three interfaces for each interface. In the course of the experiment, all of the subjects mentioned ease of operation and various functions as advantages. However, the complexity of text-based interfaces has been difficult to use because of the variety of functions that can be set up. Future research will be needed to improve the usability of camera applications by user interface.

• Women's Health Nursing
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• v.24 no.1
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• pp.1-13
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• 2018

Purpose: To develop educational material about nutrition during antepartum period for women pregnant with twins by using smartphone applications. Methods: A series of steps according to ADDIE model, including Analysis, Design, Development, Implementation, and Evaluation were used to develop smartphone application of antepartum nutrition care for women pregnant with twins. Results: Based on experts' evaluation, the average score was $4.6{\pm}0.39$ in total. Content score was $4.7{\pm}0.40$. Interface design score was $4.5{\pm}0.55$. Content score was higher than interface design score. User evaluation was conducted in the form of interview. Results of interviews revealed that users generally responded positively to the accuracy, understanding, and objectivity for content items of the smartphone app. As for the evaluation of consistency for the evaluation item of interface design, users answered "ordinary" or "generally yes". For design suitability and accuracy of vocabulary, they answered 'generally suitable'. Conclusion: The smartphone app developed through this study is expected to aid antepartum care for women pregnant with twins. It will also contribute to health promotion of both pregnant women and twin fetus.

• Journal of the Korea Society of Computer and Information
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• v.11 no.2 s.40
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• pp.187-199
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• 2006

This paper proposes the design of user centric pavilion information guide system based on mobile device such as PDA. which is composed of system interface factors as user wants. The suggested information guide system is convenient for user carrying because it is based on PDA mobile device and the used liquid browser system makes all data information displayed on a small screen in contrast with the other browser system. Indeed, factors of system interface can be re-composed by user interaction. And this system can effectively provide the detail information about the exhibited objects as various media data such as text, image, voice, music, video etc. The proposed system is made up of media database server. mobile system control server and mobile system interface which accepts user interaction and displays the information. Each system is networked based on TCP/IP and uses XML (extensible Markup Language) and JAVA 2 micro edition to be able to update data. This feature enhances a wide use to be able to load this system on the any mobile device.

• Journal of Digital Contents Society
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• v.12 no.3
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• pp.263-270
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• 2011

The importance of effective delivery of information in the mobile web is increasing in Korea, due to the growing number of smart-phone users. In this study, I took a look at the characteristics of mobile devices and the mobile web, and after researching Korea's portal websites' mobile web designs, we figured out the users' preferences of mobile web designs through surveys and interviews. To provide compressed information on a small screen, it is ideal for significant contents to show up in the state that does not require scrolling. Users preferred compact and neat designs, and menus that were made with icons that are easy to touch with fingers, in the mobile web. When receiving delivered information, users preferred not only texts but texts that were provided together with photograph images. If usability evaluations and examination of preferences are achieved together, I think it will serve as a mobile web guideline that enables efficient delivery of information in the mobile web.

• Journal of the Ergonomics Society of Korea
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• v.30 no.1
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• pp.265-273
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• 2011

Objective: The aim of this study is to investigate the attributing factors influencing usability of the mobile phones specifically designed for the elderly users. Efforts to identify factors that cause usability problems for the elderly users in using mobile phones can provide the groundwork for changes aimed at usability enhancement and design of interfaces of mobile phones. Background: It became important to understand the behaviors and tendencies of the elderly in communication as the society became older. The problems in digital divide is contributed to mainly lack of understanding in terms of the use pattern of the elderly and lack of consideration of their characteristics in designing user interfaces of most ICT devices. Method: A total of 30 elderly users who were over 65 years in age participated in usability evaluation test experiment and performed seven different tasks using a widely accepted model of universally designed mobile phone. Their performance was compared with that of contrast group that consisted of 10 younger participants who were on their 20s. Results: It was found that the elderly users had hard times in using mobile phones, especially in keypad manipulation among search, understanding, and manipulation subtasks. Conclusion: Older users seemed to have difficulty in all the subtasks of search, recognition, and manipulation. It was suggested that designers of mobile phones need to give careful consideration into designing visual interfaces for search tasks and keypads for easier control and input for the elderly users. Application: The study is expected to provide guidelines for the universal design of mobile phones and their interfaces for enhancing usability of the mobile phone for elderly users.