• Proceedings of the KAIS Fall Conference
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• 2012.05b
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• pp.835-838
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• 2012

최근 스마트폰의 폭팔적인 증가와 함께 사용 환경개선도 이루어 지고 있다. 또한 Wi-Fi 존의 증가와 LTE같은 빠른 네트워크 환경은 사용자 중심의 수 많은 앱을 탄생시키고 있다. 안드로이드는 애플의 iOS와는 다른 오픈소스 정책으로 플랫폼 소스가 공개되어 있어 많은 개발자가 쉽게 접근이 가능하다. 그러나 안드로이드는 앱(App) 검증 체계가 미흡하기 때문에 악성코드 등으로 인한 위협요소가 존재하고 있다. 또한 파일 시스템은 임의적 접근제어방식으로 공격자가 취약점을 통해 관리자 권한을 얻어 시스템 자원을 제어할 수 있기 때문에 위협요소가 다분하다. 본 논문에서는 스마트폰 앱이 호출하는 시스템 API 및 네트워크 자원사용 패턴을 분석하여 부정 앱을 차단하는 방법을 제안하였다. 제안 방법으로 실험한 결과 API호출 빈도 및 자원 사용률이 최소 기준치 이하로 검출된 경우를 제외한 평가대상은 모두 검출하여 보안성 강화에 효과적인 것으로 실험을 통하여 검증하였다.

• Journal of Korea Multimedia Society
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• v.17 no.12
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• pp.1494-1502
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• 2014

Since smartphones are utilized in the ranges from personal usages to governmental data exchanges, known but not patched vulnerabilities in smartphone operating systems are considered as major threats to the public. To minimize potential security breaches on smartphones, it is necessary to estimate possible security threats. So far, there have been numerous studies conducted to evaluate the security risks caused by mobile devices qualitatively, but there are few quantitative manners. For a large scale risk evaluation, a qualitative assessment is a never ending task. In this paper, we try to calculate relative risk levels triggered by software vulnerabilities from unsecured smartphone operating systems (Android and iOS) among 51 Asian countries. The proposed method combines widely accepted risk representation in both theory and industrial fields. When policy makers need to make a strategic decision on mobile security related agendas, they might find the presented approach useful.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.268-271
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• 2014

iOS, Android 등의 모바일 운영체제를 탑재한 스마트폰 기술의 급속한 발전으로 인해 다양한 모바일 어플리케이션들이 개발 되고 있다. 그 중에서 모바일을 통해 물품을 관리 하기 위한 기반 기술로 안드로이드의 NFC 기술을 이용하거나 블루투스 바코드 스캐너와 스마트폰의 연계 기술을 이용하고 있는 것이 현재의 추세이다. NFC 기술 또는 단순 블루투스 바코드 스캐너와의 연계만으로는 공간 내 대량의 물품을 지능적으로 관리 하기에는 한계가 있는 것이 사실이다. 본 논문에서는 Beacon 기술을 이용하여 기존의 NFC 기술 및 바코드 스캐너만으로 구현이 불가능했던 문제들을 해결할 방안을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.17-18
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• 2014

최근 모바일 기기의 보급 확산 및 관련 정보기술 발달로 건설현장에서의 모바일 서비스를 위한 사용자 요구사항이 점차 증가하고 있다. 이와 함께 공공기관에서 발주하는 도로 하천 공사를 관리하는 건설사업관리시스템 또한 모바일 서비스의 필요성이 대두 되었다. 이에 본 논문에서는 HTML5 및 jQuery를 이용한 모바일 앱을 설계하였다. 설계한 앱은 하이브라드 방식으로써 android 및 iOS 등 다른 기기와의 호환성을 유지하였다. 그리고 지도, GPS, 이미지(카메라) 및 전자서명 기능을 추가함으로써 본 시스템의 성능 향상 및 건설현장에서의 업무를 개선할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1330-1333
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• 2011

스마트폰 작동 플랫폼의 다양화와 빠른 진화속도로 인하여 어플리케이션의 개발 및 유지보수에 많은 시간과 노력이 요구되고 있다. 스마트폰 어플리케이션 개발은 플랫폼(iOS, Android 및 Window) 별로 각각 진행하고 있다. 따라서 한 어플리케이션을 다른 플랫폼에서 사용하기 위해서는 그 플랫폼에 맞게 다시 개발을 해야 하는 번거로움을 갖고 있다. 본 논문에서는 플랫폼 독립적인 스마트폰 어플리케이션 개발을 할 수 있도록 MDA와 SOA를 응용한 프레임워크를 제시하여 플랫폼에 종속되지 않고 어플리케이션을 개발할 수 있는 방법을 제시한다.

• Journal of Digital Convergence
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• v.13 no.11
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• pp.141-148
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• 2015

In this paper, for developing and implementing the HLS(Http Live Streaming) transmitter based embedded linux which is operated easily and cheap and lower power, portable in all networks and client environments compared to exist video live streaming transmitters. We design the developed HLS transmitter hardware using the Arm11 core and then porting the Embedded Linux OS(Operating System) and implementing the HLS protocol using the open source FFmpeg and Segmenter. For proving the performance of developed HLS transmitter, we make the testing environment for testing the performance of HLS transmitter including the notebook, iPhone, android Phone, Notebook and then analysis the received video in the client displayer. In this paper, we suggest the developed HLS transmitter performance data values higher than the Apple company's HLS recommended specification values and the picture of developed HLS transmitter operation in the testing environment. The application field of this paper result is that the man who works in the emergency situation take HLS and transmit the live emergency situation to the head quarter using this portable HLS.

• Journal of Digital Convergence
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• v.13 no.12
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• pp.381-390
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• 2015

One of the fundamental requirements of entertainment applications is interactivity with users. The mobile device such as the smartphone, however, does not guarantee it due to the limit of the application processor's computing power, memory size and available electric power of the battery. This paper proposes a methodology to boost responsiveness of interactive applications by taking advantage of the parallel architecture of mobile devices which, for instance, have dual-core, quad-core or octa-core. To harness the multi-core architecture, it exploits the POSIX thread, a platform-independent thread library to be able to be used in various mobile platforms such as Android, iOS, etc. As a useful application example of the methodology, a heavy matrix calculation function was transformed to a parallelized version which showed around 2.5 ~ 3 times faster than the original version in a real-world usage environment.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.9 no.3
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• pp.203-208
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• 2015

In this study, a digital textbook was developed for effective career and vocational education of students with disabilities. The contents of developed digital textbook consisted of 'lesson 15: Sale(1)' of middle school career and vocational education of basic curriculum. It progresses six periods and each topic activities are composed of open learning, learning activity 1, learning activity 2, and organized learning in order. NamoPubTreeEditor Program was used to develop the text book in the study, digital textbooks were designed to be compatible with various devices including smartphone of android operating system, Tablet PC, the iOS system, iphone, ipad, etc. In addition, it was designed to offer a variety of learning materials such as sale multimedia materials, glossary, evaluation questions, and linked data related to sale, supported self-motivated learning. allowed students to evaluate their study for the learning of students with disabilities.

• Journal of Digital Convergence
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• v.13 no.3
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• pp.193-199
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• 2015

PUSH technology is a technology that can transfer server information without user's request and it is very useful in various areas along with mobile applications. This paper suggest a suitable application model that can utilizes the PUSH technology and mobile devices by finding a useful area. For this, AdMan, a mobile application which can utilize the PUSH technology and mobile devices has been developed. AdMan is a mobile application that developed once and can be able to run on both Android and iOS based mobile devices, since it was developed by using a tool called m-Bizmaker. AdMan is a customer management and advertisement system that can bring big efficiency by utilizing the PUSH technology and mobile application under the today's mobile environment, and it is a good model of ICT technology application of modern society. As an application that can maximize the utilization of the PUSH technology and mobile devices, AdMan can realize better effectiveness if it run on a PUSH server.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.12
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• pp.2926-2932
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• 2014

Smart Phone market consists of several platforms such as Windows Phone, Apple iOS and Android of Google. Each platform uses different coding style respectively. Platform-dependent application results in high cost and low code reusability during development of application. It also provides heterogeneous display forms to users. In this paper, we propose a platform-independent generic interface model that could be operated in both the various smart phones and PC. Because the proposed model provides the same UI on multiple platforms, users can operate applications without awkwardness. The model includes a module which copes with the changes of the resolutions in various platforms and a module which switches scenes of each application for performance improvement. Moreover, a module which connects DB is also proposed in order to overcome the difference of way to store data in each platform. The implementation results show that the difference of display and operating manner in any hetero-platform is eliminated.