• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.10
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• pp.4856-4872
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• 2018

The mobile internet has grown ubiquitous across the globe with the widespread use of smart devices. However, the designs of modern mobile operating systems and their applications limit content retrieval with mobile applications. The mobile internet is not as accessible as the traditional web, having more man-made restrictions and lacking a unified approach for crawling and content retrieval. In this study, we propose an automatic and scalable mobile application content crawler, which can recognize the interaction paths of mobile applications, representing them as interaction graphs and automatically collecting content according to the graphs in a parallel manner. The crawler was verified by retrieving content from 50 non-game applications from the Google Play Store using the Android platform. The experiment showed the efficiency and scalability potential of our crawler for large-scale mobile internet content retrieval.

• Proceedings of the KIEE Conference
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• 2007.04a
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• pp.160-162
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• 2007

The systems for assisted living and convenience of user real-time requirement in data communication among devices. therefore, it system was requirement to implementation of the hardware which guarantees the real-time to load the high-performance processor with suitable Operation System. This paper apply to operated intelligence robot in USN(Ubiquitous Sensor Network) environment, particularly, it is architecture research for guarantees the real-time of a sink-node that collect various sensor information from sensors and sending to main control unit.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1533-1536
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• 2005

본 논문에서는 유비쿼터스 컴퓨팅 환경에서 단말들의 이동성에 따른 적응적인 혼잡제어 기법을 제안한다. 제안하는 혼잡 제어 기법은 무선환경의 특성에 따른 비트 에러와 혼잡에 따른 패킷 손실을 구별하기 위해서 역 혼잡 회피 단계를 도입하였다. 그리고 혼잡이 발생 했을 때, 대역폭 낭비를 최소화 할 수 있는 슬로우 스톱 단계를 추가하였다. 본 논문에서 제안하는 혼잡 제어 정책은 DCCP(Datagram Congestion Control Protocol)을 기반으로 설계하였고, 리눅스 커널 버전 2.4.19에서 구현하였다. 제안된 혼잡 제어 정책은 기존의 혼잡 제어 정책보다 적응성 있게 혼잡 상태를 제어하며, 실험 결과 무선에서뿐만 아니라 유선에서도 우수한 대역폭 이용률을 보였다.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1995-2005
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• 2008

Recently, the smart sensors and USN (Ubiquitous Sensor Network) technologies are emerging. Smart sensors add the capability of storing local temporary data, processing instant operations, transmitting information outward, to the simple sensing devices. The USN is a wireless network of sensor/smart sensors that can collect data anywhere anytime and exchange the data within the network. In this research, case studies are performed on the smart sensors and USN applications. The cases were grouped in four categories, domestic private, domestic public, foreign private, and foreign public. Based on that survey, promising applications will be proposed and developed to be implemented to the next generation high-speed EMU.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.124-126
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• 2004

본 논문에서는 유비쿼터스 헬스케어 시스템을 위한 센싱 단말기 구현 내용을 설명한다. 본 연구에서 설계한 유비쿼터스 헬스케어 시스템은 센싱 단말기, 처리 단말기, DB 서버, 전문가 서버로 구성된다. 센싱 단말기는 사용자의 생체 신호를 검출하고 처리한 후 그 결과를 무선 통신을 통해 처리 단말기로 전달한다. 본 연구에서 구현한 센싱 단말기는 8MHz로 동작하는 AVR MicroController 처리기와 맥박 센서, 그리고 Bluetooth 무선 통신 모듈로 구성되어 있다. 또한 5개의 포트별로 8개의 입력 라인이 있어 다중 센싱 (Multi-Modal Sensing)이 가능하며, Bluetooth를 지원하는 다양한 처리 단말기와 연동이 가능하다는 특징을 갖는다. 실험결과 사용자의 생체 신호를 제대로 검출하여 무선 통신으로 전달함을 알 수 있었다.

• Journal of Digital Convergence
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• v.7 no.1
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• pp.175-183
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• 2009

With the development of enabling technologies such as wireless networking and various types of hand held-mobile devices, Mobile intelligent agent has been widely applied to various fields. Different views on capabilities, advantages, and disadvantages of mobile intelligent agent providing an ubiquitous access are brought by field researchers and practitioners recently. The purpose of this paper is thus to provide the discussion of the comtemporary development of mobile intelligent agent in the contexts of the Infosphere, focusing especially on developing and nurturing the future research grounds such as information scalability, and information security. The results of this study would improve the applications of mobile intelligent agents in web transaction, especially mobile business surroundings where many interest groups have to adjust their point of issues rapidly due to the changing business environment, i.e., customer's change the order item in web.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.121-122
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• 2006

In this paper, a zigbee system is based on IEEE 802.15.4 is a technology. It is a wireless communication and Ubiquitous Sensor Network which we have been concern about. It attempts to provide a low data rate, low power, low cost and short sensor wireless networking on the device-level communication. These devices are likely to operate in offices and factories. In this paper, we introduce some receiver schemes and show a BER performance.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.598-599
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• 2016

Today, embedded, mobile, and cyber-physical systems are ubiquitous and used in many applications, from industrial control systems, modern vehicles, to critical infrastructure. Current trends and initiatives, such as "Industry 4.0" and Internet of Things (IoT), promise innovative business models and novel user experiences through strong connectivity and effective use of next generation of embedded devices. We survey an introduction to Industrial IoT systems, the related security and privacy challenges, and an outlook on possible solutions towards a holistic security framework for Industrial IoT systems in this paper.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.474-476
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• 2018

Natural disasters destroy decades of human effort and investments, thereby placing new demands on society for reconstruction and rehabilitation. In most case, the natural phenomena triggering the disasters are beyond human control. In order to solve the problems that the information resources can not be shared among disaster management sectors and their work is hard to be coordinated in city, an idea of application of ubiquitous sense network and ICT technology to model the architecture of the disaster prevention system based on the analysis of characteristics of disasters.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.1B
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• pp.53-61
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• 2010

M2M Platform is the future ubiquitous network technologies which provide the integrated service with the networks and devices. It requires the standardized message protocols among the sensor applications. In this study, we developed the message protocols that support the data abstraction and interoperability among application systems with characteristics of sensor systems. The message protocols consist of the data representation formats and data exchange functions.