• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.4
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• pp.1090-1105
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• 2012

A multi-modal sensing M2M healthcare monitoring system for the continuous monitoring of patients under their natural physiological states or elderly persons with chronic diseases is summarized. The system is designed for homecare or the monitoring of the elderly who live in country side or small rest home without enough support from caregivers or doctors, instead of patient monitoring in big hospital environment. Further insights into the natural cause and progression of diseases are afforded by context-aware sensing, which includes the use of accelerometers to monitor patient activities, or by location-aware indoor tracking based on ultrasonic and RF sensing. Moreover, indoor location tracking provides information about the location of patients in their physical environment and helps the caregiver in the provision of appropriate support.

• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1602-1605
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• 2002

Communication schemes are currently changing from circuit switched towards packet switched. These changes enable access to Internet and multimedia services in wireless network. Provision of real-time IP services in air interface introduces relatively large overhead in RTP/UDP/IP headers. To reduce the overhead, the header compression schemes are required. There exist two header compression schemes (CRTP, ROHC) which are IETF standards. We propose Context-ID detection method which reduces more efficiently the packet loss rate than two existing schemes. Its performance in WCDMA system environment is evaluated for CRTP and ROHC schemes.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.807-808
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• 2006

While use of computers to teach English in a conventional educational environment promotes motivation and effective learning in students, the method generates problems such as provision of learning materials without consideration of teaching methods and evaluation without consideration of individual differences in students. To solve these problems and produce a superior system, we propose knowledge representation of expert module for an Intelligent Tutoring System (ITS).

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.28 no.12
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• pp.84-89
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• 2014

This paper proposes the new multiple signal processing monitoring sensor for the marine installation. The recent marine technology is focused on underwater sensors and underwater sensor networks in order to measure, monitor, surveillance of and control of underwater environments. For these marine applications to be available, however, the provision of precise location information using monitoring sensor is essential. In this paper, the multiple signal processing circuit for obtaining the precise location information of marine installation sensor is developed and analyzed. The performance characteristics for obtaining the location information of marine installation sensor is analyzed. The theoretical and experimental studies have been carried out. The presented results from the above investigation show considerably excellent performance for the monitoring for the marine installation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.235-238
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• 2016

With the vision of Internet of Things (IoT), physical world itself is becoming a connected information system on the Internet and cyber world is computing as a physical act to sense and respond to real-world events collaboratively. The systems that tightly interlink the cyber and physical worlds are often referred to as Smart Systems or Cyber-Physical Systems. Smart IoT Clouds aim to provide a cyber-physical infrastructure for utility (pay-as-you-go) computing to easily and rapidly build, modify and provision auto-scale smart systems that continuously monitor and collect data about real-world events and automatically control their environment. Developing specifications for service interoperability is critical to enable to achieve this vision. In this paper, we bring an issue to extend Open Cloud Computing Interface for uniform, interoperable interfaces for Smart IoT Cloud Services to access services and build a smart system through orchestrating the cloud services.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.8B
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• pp.1150-1158
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• 2010

At present multimedia service composed of voice, data, and video service is prevalent in the Internet. As such, wide-scale penetration of Internet service imposes tremendous pressure to the network infrastructure such as the media servers and links as well as the nodes. In addition, users from a large-scale population require broad bandwidth and high level of QoS. This requires a network with reliable and scalable services to customers, which also necessitates a realistic method for the design of the a media server. In this work, we explore the influence of user's behavior about delay on the performance of media server that takes into account the system and user attributes in a realistic manner. By incorporating user's behavior about the delay-sensitivity, we present an analytic framework for the evaluation of the performance of the media server, via which we illustrate a meaningful intuition in the provision of Internet multimedia service.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.550-553
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• 2010

미국해양대기국(NOAA : National Oceanic and Atmospheric Administration) 위성에 의해서 해수표면 수온자료를 실시간으로 제공하며, 이를 이용하여 우리나라는 한국해양자료센터(KODC : Korea Oceanographic Data Center)에서 해양과학정보를 수집 관리하여 연근해 어민 및 수산관련기관에 배포하고 있다. 그러나 원양어업을 하고 있는 선박에서는 통신요금의 문제로 제대로 제공받지 못하고 있다. 본 논문은 이를 해결하고자 수온정보 이미지의 변환, 압축을 통한 통신요금 절감 및 컬러 이미지 제공에 따른 판별력 향상에 도움을 주고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.137-139
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• 2014

Objective: Data exchange, interoperability, and access as a service in healthcare information management systems (HIMS) is the basic need to provision health-services. Data existing in various HIMS not only differ in the basic underlying structure but also in data processing systems. Data interoperability can only be achieved when following a common structure or standard which is shareable such as semantics based structures. We propose web-enabler: A Hadoop MapReduce based distributed approach to transform the existing huge variety data in variety formats to a conformed and flexible ontological format that enables easy access to data, sharing, and providing various healthcare services. Results: For proof of concept, we present a case study of general patient record in conventional system to be enabled for analysis on the web by transforming to semantics based structure. Conclusion: This work achieves transformation of stale as well as future data to be web-enabled and easily available for analytics in healthcare systems.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.2
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• pp.374-388
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• 2011

Biometric discretization is a process of transforming continuous biometric features of an identity into a binary bit string. This paper mainly focuses on improving the global discretization method - a discretization method that does not base on information specific to each user in bitstring extraction, which appears to be important in applications that prioritize strong security provision and strong privacy protection. In particular, we demonstrate how the actual performance of a global discretization could further be improved by embedding a global discriminative feature selection method and a Linearly Separable Subcode-based encoding technique. In addition, we examine a number of discriminative feature selection measures that can reliably be used for such discretization. Lastly, encouraging empirical results vindicate the feasibility of our approach.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2006.06a
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• pp.67-80
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• 2006

무선 인터넷 환경이 기존의 유선 인터넷 환경과 비슷한 수준으로 정보 서비스가 가능해지면서, 언제 어디서나 필요한 정보를 손쉽게 찾을 수 있는 무선 인터넷 환경에서의 정보 서비스 소요가 급증하고 있다. 이러한 정보 서비스의 환경 변화로 인하여 기존의 유선 인터넷 정보 제공자들은 무선 인터넷을 통한 정보 서비스를 제공하려고 하고 있다. 그러나 무선 인터넷을 이용한 정보 서비스가 상대적으로 고가의 비용을 지불해야 하기 때문에 많은 사용자를 확보하고 유지하는 것은 쉬운 일이 아니다. 따라서 무선 인터넷 환경에서 정보 서비스를 제공하기 위해서는 고객이 원하는 정보를 보다 쉽고 빠르게 기원하기 위한 방법이 마련되어야 하며, 이를 위한 전략적 시스템이 필요하다. 본 연구에서는 이러한 필요성에 따라 무선 인터넷 가입자를 대상으로 고객의 특성을 고려한 맞춤형 정보 서비스를 지원하는 모바일 응용 시스템, MoSA-CRM(Mobile Service Application based on CRM)를 개발하였다. 개발된 MoSA-CRM 시스템은 고객에게 특화된 맞춤형 서비스를 제공하고, 이를 통해 보다 체계적이고 신속한 정보 제공을 가능하도록 하였다.