• The Journal of the Korea Contents Association
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• v.16 no.12
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• pp.43-49
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• 2016

As user-centered design and content development emerge, the research and the establishment of items on usability evaluation are becoming more important. However, research on usability evaluation for digital systems in specific areas of mobile applications is still incomplete. Due to the recent development of wearable devices and smartphones, development and usage of quantified-self and life-logging applications has been rapidly increasing. This study aims to establish evaluation items and the main factors for the usability assessment of the applications that support life-logging services. In order to establish evaluation factors for life-logging application usability, we first gathered existing usability assessment items and selected the initial items through the Focus Group Interview(FGI). Second, we conducted user assessment surveys on the selected initial questionnaires and performed reliability and exploratory factor analyses based on the survey results. Third, through the statistical analyses results, we established 28 usability assessment items and four factors: recognition; functionality; aesthetics; and satisfaction. Finally, we discussed the expectations and limitations of the established usability assessment. The results from this paper could be used as a guideline for the usability assessment of life-logging applications and thus will contribute to effective content development.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.256-259
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• 2014

전통적인 측정 방법이나 DSA장비를 이용해 측정이 불가능하거나 제한되었을 때를 대비해, 언제 어디서나 용이하게 진동 데이터를 측정하기 위해 개발된 휴대용 무선 측정 수집기 RH-DAQ와 연계되는 안드로이드 애플리케이션을 개발한다. 이 연구를 통해 데이터 수집기에서 전송하는 데이터를 안드로이드 스마트폰에서 그래프화 시킴으로서 사용자의 측정에 편리성을 제공하고, 설정 정보 및 측정 데이터를 저장 가능하다. 추후 기능들을 업그레이드하면 철로 주변의 진동 환경 평가 등의 기존 시스템으로 제한된 곳에서의 장점을 보일 수 있고 다른 다양한 분야에도 사용 될 수 있다.

• Journal of Digital Convergence
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• v.14 no.10
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• pp.393-398
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• 2016

Stock information applications allow users to look up and find current stock information whenever and wherever. This study researched what kind of user experience the finance experts get when using these applications and what they suggest. The research was conducted through an in-depth interview of 8 finance experts, who worked minimum of three years, and used both Kakao Stock and JeungGwon Tong, the most used stock information applications, for a minimum duration of six months. The results show the user experience of Kakao Stock rated a bit higher than JeungGwon Tong. Since the objective of such applications are to show stock informations, the experts all rated the pleasurable and meaningful aspects rather low. They suggested, the developers should provide a more advanced and accurate information. They also suggested user interest recognized content be presented along with more convenient user interface to elevate usability. Hopefully, this study becomes a base to further study of user experience of various on and offline stock information services and they become a reference to develop a service with great user experience.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.3
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• pp.141-148
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• 2012

Android that was made by Google and Open Handset Alliance is the open source software toolkit for mobile phone. Nowadays, Smart phone users have been rapidly increasing, by that reason a lot of application contents have been released and especially contents which focus on user convenience have been developed. In this paper, we develop a new application content smart alarm based on Google Android flatform. The features of the developed content are as follows. First, users set their day's schedules. So they can notify easily what they have to do at the moment. Second, when users set their alarms not to forget several sequential tasks, they can set their schedules by not only alarm method but also timer method. In the performance evaluation, we show the results of simulation using AVD(Android Virture Device).

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.124-127
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• 2011

스마트 폰과 같은 모바일 디바이스의 연산 능력 향상으로 다양한 모바일 어플리케이션의 개발이 증가하고 있다. 특히, 모바일 디바이스에 장착된 다양한 센서를 통해 수집되는 컨텍스트 정보를 기반으로한 모바일 컨텍스트 애플리케이션에 대한 요구가 크게 증가하는 추세이다. 하지만 모바일 컨텍스트는 모바일 디바이스의 다양한 종류와 운영체제, 정보의 종류 등에 따라 다양한 형태가 존재한다. 모바일 컨텍스트의 다양성에 의해 모바일 컨텍스트 애플리케이션 개발에 추가적인 비용이 발생한다. 본 논문에서는 효과적인 모바일 컨텍스트 애플리케이션의 개발을 위한 모바일 컨텍스트의 가변성 모델을 제안한다. 가변성 분석을 통해 모바일 컨텍스트의 다섯 가변점과 각 가변점의 가변치를 정의한다. 또한 제안된 가변성 모델을 기반으로 활용 가능한 사례를 제시하고, 제안된 모델의 평가를 수행한다.

• Journal of the Korea Society of Computer and Information
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• v.18 no.3
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• pp.69-77
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• 2013

This research validates the correlation between usability and functional attributes whilst comparing the degree of satisfaction of information framework used in museum mobile apps via usability evaluation in pre-visit setting. In cases of Bilbao Guggenheim and American Natural History Museum apps, the degree of satisfaction measured for information service, functional attributes, motivation for actual museum visit and during-visit usability of the apps were all highly evaluated. Such evaluation data indicates the increased usability of apps when mobile applications take user-friendly design that intuitively reflect users' interests and needs. After thorough analysis of correlation between usability and fictional attributes, data pointed to more meaning relationships existed in non-intrusiveness and personalization than other functional attributes. In conclusion, we were able to acknowledge the usability of museum mobile apps depends upon the interaction between content and functional attributes rather than entertainment factor and technology.

• Journal of the Korea Convergence Society
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• v.11 no.6
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• pp.29-36
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• 2020

As the Ministry of Education adds an item to evaluate whether a university strictly manages class time compliance and student attendance, the number of cases in which universities use electronic attendance systems is increasing. If you use the electronic attendance system, you can manage attendance and record management in real time. In this paper, I would like to suggest a solution to the prevention of cheating, which is a problem with the existing electronic attendance system. In this paper, automatic attendance is possible by automatic or correction. If the electronic attendance is performed manually, the BLE beacon service of the professor's smartphone is activated, and then the student's electronic attendance application is automatically executed using the push message service. When the student clicks the attendance check button and the beacon is found, attendance is processed. In the case of automatic processing, the beacon is automatically searched and attendance is handled even if the student is not involved. The proposed system automatically handles attendance even when the student does not recognize it, and has the advantage of preventing illegal attendance because it can reconfirm attendance at unspecified intervals.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.6
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• pp.1199-1206
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• 2022

In this paper, unlike door locks that are controlled only by the existing keypad because electronic devices can be easily operated through apps on smartphones in modern society, an app was created using app inventory so that door locks can be controlled using smartphones. Through the Bluetooth module experiment, the communication distance with the smartphone was controlled up to 10m when there were no obstacles, and through the voice recognition experiment, the recognition rate was 85% and 90% at 500~1000Hz and 1000~1500Hz, respectively, and 70% and 80% at 80dB noise. Through the results of the experimental evaluation, it was confirmed that convenience and security could be improved.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.424-426
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• 2012

REST 웹 서비스는 HTTP 프로토콜을 통해 손쉽게 적용 및 배포할 수 있다. 최근 다양한 정보시스템의 데이터베이스가 REST Open API 웹서비스를 통하여 배포되고 있으며, 이는 스마트폰 애플리케이션, 웹(Web) 등의 다양한 분야에서 활용되고 있다. 본 연구는 오픈 API 에 대한 시스템의 성능의 포인트에 서비스 평가를 제공하는 것이다. 본 연구는 REST 오픈 API 의 수행 성능 평가를 통하여 REST 오픈 API 웹 서비스의 확장성에 초점을 둔다. 이를 위해 REST 오픈 API 가 미래에 모바일 클라우드 플랫폼으로써 충분한 성능 및 활용될 수 있는지 검증할 필요가 있다. 본 논문은 큐잉 네트워크(Queueing Network)을 활용하여 REST Open API 웹서비스 서버 시스템을 모델링하고 성능을 분석하였다.

• Information Systems Review
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• v.20 no.1
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• pp.1-16
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• 2018

The development and generalization of the Internet increased the popularity of food delivery service applications in Korea. The food delivery market based on online-to-offline service is growing rapidly. This study compares the usability of Korean food delivery service application between that of Chinese food delivery service application. This study suggests improvement points for Korean food delivery service applications. To conduct this study, we explore the status of various food delivery service applications and conduct interviews and surveys based on the honeycomb model developed by Peter Morville. This study obtained the following results. First, all restaurants participating in the Korean food delivery service must be able to accept order through the application. Second, the shopping cart function must be able to accept order of all restaurants simultaneously. Third, when users look for menu recommendation, their purchase history and shopping cart functions should appear at the first page of the website. Users should be able to perceive the improved usability of the website using those functions. Fourth, when the search window is fixed on the top of each page, users should be able to find the information they need. Fifth, the application must allow users to find the exact location of the delivery person and the estimated delivery time. Finally, the restaurants'address should be disclosed and fast delivery time should be confirmed to enhance users'trust on the application. This study contributes to academia and industry by suggesting useful insight into food delivery service applications and improving the point of food delivery service application in Korea.