• Journal of Information Processing Systems
• /
• 제14권5호
• /
• pp.1102-1113
• /
• 2018

Vibrotactile feedback is widely used in designing non-visual interactions on mobile phones, such as message notification, non-visual reading, and blind use. In this work, novel vibrotactile codes are presented to implement a non-visual text reading system for mobile phones. The 26 letters of the English alphabet are formed in an index table with four rows and seven columns, and each letter is mapped using the codes of vibrations. Two kinds of vibrotactile codes are designed with the actuator's on and off states and with specific lengths (short and long) assigned to each state. To improve the efficiency of tactile perception and user satisfaction, three user experiments are conducted. The first experiment explores the maximum number of continuous vibrations and minimum vibration time of the actuator's on and off states that the human can perceive. The second experiment determines the minimum interval between continuous vibrations. The vibrotactile reading system is designed and evaluated in the third experiment according to the results of the two preceding experiments. Results show that the character reading accuracy reaches 91.7% and the character reading speed is approximately 617.8 ms. Our method has better reading efficiency and is easier to learn than the traditional Braille coding method.

• International Journal of Computer Science & Network Security
• /
• 제21권1호
• /
• pp.125-136
• /
• 2021

The development of systems that can generate automatically instructional material is a challenging goal for the e-learning community. These systems pave the way towards large scale e-learning deployment as they produce instruction on-demand for users requesting to learn about any topic, anywhere and anytime. However, realizing such systems is possible with the availability of vast repositories of web information in different formats that can be searched, reused and integrated into information-rich environments for interactive learning. This paradigm of learning relieves instructors from the tedious authoring task, making them focusing more on the design and quality of instruction. This paper presents a mobile learning system (Mole) that supports the generation of instructional material in M-Learning (Mobile Learning) contexts, by reusing and integrating heterogeneous hypermedia web resources. Mole uses open hypermedia repositories to build a Learning Web and to generate learning objects including various hypermedia resources that are adapted to the user context. Learning is delivered through a nice graphical user interface allowing the user to navigate conveniently while building their own learning path. A test case scenario illustrating Mole is presented along with a system evaluation which shows that in 90% of the cases Mole was able to generate learning objects that are related to the user query.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2014년도 추계학술대회
• /
• pp.71-74
• /
• 2014

최근 모바일 앱에서도 오픈소스 소프트웨어를 이용한 개발이 활발하게 이루어지고 있다. 오픈소스 모바일 컴포넌트의 경우 User Interface 구현을 위한 컴포넌트의 재사용성이 용이하다는 이유로 기능적 역할의 컴포넌트보다 더욱 많이 사용되는 경향이 있다. 이런 특징으로 인해 기존의 오픈소스 소프트웨어 선정절차나 상용 컴포넌트 선정절차 두 가지 연구 모두 오픈소스 모바일 컴포넌트 선정에 그대로 적용하기에는 무리가 있다. 본 논문에서는 기존에 연구된 오픈소스 소프트웨어 선정절차를 모바일 컴포넌트 선정에 적합하도록 수정, 보완하였다. 본 연구는 모바일 앱을 개발할 경우 요구되는 기능을 충족하는 오픈소스 컴포넌트를 쉽게 검색하고 선정할 수 있는 효율적인 절차를 제시함으로써 모바일 앱 개발의 생산성을 높여줄 수 있다.

• 디지털콘텐츠학회 논문지
• /
• 제18권8호
• /
• pp.1475-1480
• /
• 2017

사용자 경험은 중국 휴대폰 책읽기 앱이 혁신적으로 발전하는 중요한 경로이다. 설비, 플랫폼, 매체, 내용 및 형식은 이동식 매체 사용자 경험의 대상 전체로 구성된다. 사용자 요구을 이해하는 것은 사용자 경험을 향상시키는 논리적인 출발점이다. 본 연구는 사용자가 실제 사용 환경에서 전자 도서의 찾기 및 다운로드, 앱 화면 설치 및 경험, 음성의 낭독 체험, 평가 및 공유 네가지를 진행하게 한다. 사용자에 대한 관찰 및 인터퓨를 바탕으로 관련된 문제를 수집하고 정리를 통하여 사용자로 하여금 불쾌한 요소를 선별한다. 이상 문제에 대하여 초점을 맞춰 본 연구는 중국 휴대폰식 책읽기 앱을 개선하는 구체적인 의견을(가이드라인) 제시한다.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제17권1호
• /
• pp.162-166
• /
• 2017

Earliest virtual deadline zero laxity (EVDZL) algorithm is proposed for mobile GPU schedulers for its improved responsiveness. Responsiveness of user interface (UI) is one of the key factors in evaluating smart devices because of its significant impacts on user experiences. However, conventional GPU schedulers based on completely fair scheduling (CFS) shows a poor responsiveness due to its algorithmic complexity. In this letter, we present the EVDZL scheduler based on the conventional earliest deadline zero laxity (EDZL) algorithm by accommodating the virtual laxity concept into the scheduling. Experimental results show that the EVDZL scheduler improves the response time of the Android UI by 9.6% compared with the traditional CFS scheduler.

• 한국게임학회 논문지
• /
• 제20권4호
• /
• pp.67-76
• /
• 2020

본 연구는 모바일 플랫폼을 기반으로 한 야구 매니저 게임의 로비 UI를 분석하여 최적화 로비 UI를 제안한다. 4종의 게임 로비 내의 UI 레이아웃 기반 세부 아이콘, 버튼과 같은 상호작용 요소들의 위치를 공통점과 차이점을 비교 및 분석하여 최적화된 UI 구성을 최종 산출한다. 나아가 분석 내용을 바탕으로 사용자 중심 디자인에 맞춰 최적화된 로비 UI를 제안하고자 한다.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2011년도 춘계학술논문집 1부
• /
• pp.371-374
• /
• 2011

Recently, retrieval of various video data has become an important issue as more and more multimedia content services are being provided. To effectively deal with video data, a semantic-based retrieval scheme that allows for processing diverse user queries and saving them on the database is required. In this regard, this paper proposes a semantic-based video retrieval system that allows the user to search diverse meanings of video data for electrical safety-related educational purposes by means of automatic annotation processing. If the user inputs a keyword to search video data for electrical safety-related educational purposes, the mobile agent of the proposed system extracts the features of the video data that are afterwards learned in a continuous manner, and detailed information on electrical safety education is saved on the database. The proposed system is designed to enhance video data retrieval efficiency for electrical safety-related educational purposes.

• 한국정보시스템학회지:정보시스템연구
• /
• 제14권2호
• /
• pp.133-154
• /
• 2005

The objective of this study is to find the factors influencing the use of mobile service. We extracted critical study variables according to literature reviews about adoption of information systems, those under the internet environment and mobile internet adoption for theoretical foundation. TAM suggested by Davis(1985) has explained the acceptance mechanism with the following constructs: perceived usefulness, perceived ease of use, attitude toward use, behavioral intention and actual usage. After studying prior literature reviews, this study investigated the group of people using mobile services. The result of study claims that it has same results with previous TAM, especially between personal innovativeness and attitude toward use have strong statistical relations. On the other hand, there haven't been any statistical relations between perceived ease of use and perceived usefulness and between perceived usefulness and behavioral intention, either. In conclusion, use of mobile service can be promoted by developing various kinds of mobile service, designing device and interface to use mobile service more convenience and familiar, stimulating user's innovative characters and recognizing mobile service more useful in real life.

• 융합보안논문지
• /
• 제8권4호
• /
• pp.167-179
• /
• 2008

유비쿼터스 기술이 발달하면서 모바일 기기를 통해 다양한 콘텐츠를 사용자에게 적합한 정보만을 제공하기 위한 연구가 활발하게 진행되고 있다. 그러나 모바일 기기의 작은 사용자 인터페이스로 인해 정보제공에 한계가 있다. 본 논문에서는 이런 문제점을 해결하고 모바일 환경에 적합한 지능형 에이전트 모델과, 각 개인 사용자들이 관심 있는 일자리 정보를 능동적으로 제공할 수 있는 시스템을 제안한다. 사용자 행동패턴을 감시하는 Personalization Engine과, 모바일 기기에 정보제공을 위한 Learning Algorithm으로 구성되었다. 조사를 통해 성별, 나이, 학력에 따라 선호하는 직업 항목이 다른 것을 알았으며, 지역은 직업을 검색 할 때 많은 영향을 주는 것으로 나타났다.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2015년도 춘계학술대회
• /
• pp.304-307
• /
• 2015

Virtualization lacks capabilities for enabling the application to scale efficiently because of new applications components which are raised to be configured on demand. In this paper, we propose an architecture that affords mobile app based on nomadic smartphone using not only mobile cloud computing-cloudlet architecture but also a dedicated platform that relies on using virtual private mobile networks to provide reliable connectivity through Long Term Evolution (LTE) wireless communication. The design architecture lies with how the cloudlet host discovers service and sends out the cloudlet IP and port while locating the user mobile device. We demonstrate the effectiveness of the proposed architecture by implementing an android application responsible of real time analysis by using a vehicle to applications smart phones interface approach that considers the smartphones to act as a remote users which passes driver inputs and delivers outputs from external applications.