• 정보보호학회논문지
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• 제27권2호
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• pp.361-371
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• 2017

스마트폰 기기 내에 저장되는 사용자 정보가 다양화되어 개인정보에 대한 위협도 함께 증가하고 있다. 패턴 잠금, 지문 인식 등 다양한 사용자 인증 기술이 스마트폰에 적용되어 있으나 사용자 의존적, 거부감 유발 등의 한계점을 보이고 있다. 최근 주목받고 있는 행위 기반 인증은 기기 사용과 동시에 인증이 가능하여 사용자에게 높은 편의성을 제공하나 타 인증 기술에 비해 정확도가 낮아 이를 개선하기 위한 연구가 꾸준히 수행되고 있다. 본 연구에서는 이전 연구에서 고려되지 않았던 앱 사용 정보를 새로운 인증 요소로 활용하는 방법을 제안한다. 또한 실제 앱 사용 상황을 고려한 데이터 수집 및 분석을 통해 제안 기술의 성능을 상세하게 분석한다.

• 한국IT서비스학회지
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• 제13권1호
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• pp.209-220
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• 2014

Most of monitoring systems in logistics industry have limitations on monitoring container information in real-time. And customers only could check information gathered from certain points through web browser. That is why it is very hard to take actions in advance when emergency situation has happened. But if customers could check information such as position and status of freight in real-time through their mobile devices, they could take prompt actions. So, in this study, mobile application based on mobile devices is developed to monitor position and status information of the container in real-time. Entire devices monitoring container in aspect of logistics security are handled by workers in the field. So it is strongly required to develop monitoring system operated in mobile devices. For that reason this study aims to develop mobile application in order to monitor information related to container security and safety in real-time.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 춘계학술발표대회
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• pp.89-91
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• 2011

Diabetes is a chronic disease which may lead to other life threatening health complications like heart disease, stroke and peripheral vascular disease that diminished quality of life. In order to assists diabetic patients, we develop a smartphone application to monitor the regular medicine intake and exercise routines through repetitive user friendly and motivational reminders. Health-practitioners including doctors and nurses can frequently view and analyze the daily routine of patients through a web-interface. This paper presents architecture to improve the quality of life with android smart phone as user terminal, and integration of webbased application through web services for health care professionals. We also explain how each of the application interacts with each other and internal integration.

• 제어로봇시스템학회논문지
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• 제20권2호
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• pp.223-231
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• 2014

Humanoid robot is the most suitable robot platform for effective human interaction and various intelligent services. The present work addresses development of real time wireless control application of humanoid robot's forward and backward walks, and turning in walking. For convenience of human users, the application is developed on Android OS (Operating System) working on his or her smartphone. To this end, theoretic background on various-directional biped walking is proposed based on joint trajectories for forward walking, which have been shaped with a global optimization method. In this paper, backward walking is scheduled by interchange of angles and angular velocities and additional change of signs in angular velocities at all the via-points connecting cubic polynomial trajectories. Turning direction in walking is also implemented by activating the transversal hip joint initially located in the support leg in two stages. After validation of the proposed walking schemes with Matlab simulator, a smartphone application for the omnidirectional walking has been developed to control a humanoid robot platform named DARwIn-OP interconnected via Wi-Fi. Experiment result of the present wireless control of a humanoid robot with smartphone is successful, and the application will be released in application market near future.

• 한국전자거래학회지
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• 제16권4호
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• pp.173-195
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• 2011

스마트폰 시장이 성장하면서 다양한 모바일 애플리케이션을 제공할 수 있는 능력이 스마트폰의 경쟁력으로 부상하고 있다. 모바일 애플리케이션 시장은 잠재력 있는 새로운 시장으로 평가받고 있다. 앱 스토어 같은 애플리케이션 시장에서 많은 구매자들이 무료 및 유료 모바일 애플리케이션을 다운로드 받고있지만, 아직 소비자의 애플리케이션 구매에 대한 주요 연구는 없는 실정이다. 그러므로, 우리는 유료 애플리케이션을 구매한 적 있는 사용자를 대상으로 스마트폰용 모바일 애플리케이션 구매동기에 관한 연구를 하고자 한다. 이에 30명의 사용자와 인터뷰를 진행하였다. 또한, 애플리케이션을 4가지 종류(생산성, 유희성, 정보성, 사회성)로 분류하였으며 각각의 분류 별 구매 동기에 대하여서도 분류하였다. 인터뷰에 대한 비교분석을 통해 애플리케이션 구매에 어떤 요소가 영향을 미치는지 알 수 있었다. 이 모형은 모바일 애플리케이션 비즈니스 구축 및 모바일 애플리케이션 시장 활성화 전략, 또는 다른 실질적인 기여를 할 수 있을 것으로 기대된다.

• Healthcare Informatics Research
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• 제24권4호
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• pp.381-386
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• 2018

Objectives: This study aimed to describe the process of utilizing a mobile application for ecological momentary assessment (EMA) to collect data on stress and mood in daily life setting. Methods: A mobile application for the Android operating system was developed and installed with a set of questions regarding momentary mood and stress into a smartphone of a participant. The application sets alarms at semi-random intervals in 60-minute blocks, four times a day for 7 days. After obtaining all momentary affect and stress, the questions to assess the usability of the mobile EMA application were also administered. Results: The data were collected from 97 police officers working in Gyeonggi Province of South Korea. The mean completion rate was 60.0% ranging from 3.5% to 100%. The means of positive and negative affect were 18.34 of 28 and 19.09 of 63. The mean stress was 17.92 of 40. Participants responded that the mobile application correctly measured their affect ($4.34{\pm}0.83$) and stress ($4.48{\pm}0.62$) of 5-point Likert scale. Conclusions: Our study investigated the process of utilizing a mobile application to assess momentary affect and stress at repeated times. We found challenges regarding adherence to the research protocol, such as completion and delay of answering after alarm notification. Despite this inherent issue of adherence to the research protocol, the EMA still has advantages of reducing recall bias and assessing the actual moment of interest at multiple time points that improves ecological validity.

• 컴퓨터교육학회논문지
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• 제16권4호
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• pp.23-31
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• 2013

본 연구는 초등학생을 대상으로 개발한 스마트폰중독 개입교육 프로그램이 최근 빠른 추세로 증가하고 있는 초등학생의 스마트폰 과다사용 감소에 효과적인가를 규명하는데 그 연구 목적을 두었다. 이러한 목적을 달성하기 위해 중독현상을 나타내는 사람들의 심리치료에 효과성이 검증된 인지행동치료를 기반으로 기존에 개발된 인터넷중독 개입프로그램을 분석하고, 이를 토대로 스마트폰중독 개입을 위한 교육프로그램을 개발 적용하였다. 본 연구의 결론을 제시하면 다음과 같다. 첫째, 스마트폰중독 개입교육 프로그램은 비합리적인 사고와 습관적 행동으로 스마트폰을 과다하게 사용하는 학생들의 스마트폰 중독 경향을 감소시키는데 효과가 있다. 둘째, 스마트폰중독 개입교육 프로그램은 일상생활장애, 내성과 같은 스마트폰 중독의 부정적 요인들에 대한 행동의 변화를 촉진하고, 초등학생의 스마트폰 사용에 대한 긍정적인 인지를 재구성하는데 도움이 될 것이다.

• International Journal of Advanced Culture Technology
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• 제4권1호
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• pp.28-30
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• 2016

Due to the high increment in usage and built-in advanced technology of smartphones, human activity recognition relying on smartphone sensor data has become a focused research area. In order to reduce noise of collected data, most of previous studies assume that smartphones are fixed at certain positions. This strategy is impractical for real life applications. To overcome this issue, we here investigate a framework that allows detecting the status of a traveller as idle or moving regardless the position and the direction of smartphones. The application of our work is to estimate the total energy consumption of a traveller during a trip. A number of experiments have been carried out to show the effectiveness of our framework when travellers are not only walking but also using primitive vehicles like motorbikes.

• Journal of information and communication convergence engineering
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• 제9권6호
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• pp.695-700
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• 2011

Smartphone has formed a new market and introduced a new environment. They have an operating system like PCs, enabling free installation and removal of application programs. As the number of Smartphone users is increasing, more personal information is also exposed to malicious codes. There are problem of modification and deletion of files, battery consumption, and information leakage due to malicious codes. As the needs of Smartphone antivirus solutions are increasing, the antivirus solutions should be evaluated with quality characteristics. In this paper, we propose an effective evaluation method for functionality and performance of Smartphone antivirus solutions, and the best practices for evaluation.

• 한국IT서비스학회지
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• 제12권4호
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• pp.435-447
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• 2013

If we use a smartphone to analyze and detect falling, it is a huge advantage that the person with a sensor attached to one's body is free from awareness of difference and limitation of space, unlike attaching sensors on certain fixed areas. In this paper, we suggested effective posture analysis of smartphone users, and fall detecting system. Suggested algorithm enables to detect falling accurately by using the fact that instantaneous change of acceleration sensor is different according to user's posture. Since mobile applications working on smart phones are low in compatibility according to mobile platforms, it is a constraint that new development is needed which is suitable for sensor equipment's characteristics. In this paper, we suggested posture analysis algorithm using smartphones to solve the problems related to user's inconvenience and limitation of development according to sensor equipment's characteristics. Also, we developed fall detection system with the suggested algorithm, using hybrid mobile application which is not limited to platform.