• Journal of Korea Multimedia Society
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• v.13 no.9
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• pp.1322-1328
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• 2010

Recently, keyword spotting system is greatly in the limelight as UI(User Interface) technology of ubiquitous home network system. Keyword spotting system is vulnerable to non-stationary noises such as TV, radio, dialogue. Especially, speech recognition rate goes down drastically under the embedded DSP(Digital Signal Processor) environments because it is relatively low in the computational capability to process input speech in real-time. In this paper, we propose a new keyword spotting system using the call-command method, which is consisted of small number of recognition networks. We select the call-command such as 'narae', 'home manager' and compose the small network as a token which is consisted of silence with the noise and call commands to carry the real-time recognition continuously for input speeches.

• Journal of Institute of Control, Robotics and Systems
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• v.20 no.5
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• pp.486-494
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• 2014

Intelligent homes consist of ubiquitous sensors, home networks, and a context-aware computing system. These homes are expected to offer many services such as intelligent air-conditioning, lighting control, health monitoring, and home security. In order to realize these services, many researchers have worked on various research topics including smart sensors with low power consumption, home network protocols, resident and location detection, context-awareness, and scenario and service control. This paper presents the real-time metabolic rate estimation method that is based on measured heart rate for human adaptive appliance (air-conditioner, lighting etc.). This estimation results can provide valuable information to control smart appliances so that they can adjust themselves according to the status of residents. The heart rate based method has been experimentally compared with the location-based method on a test bed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.4
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• pp.315-325
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• 2014

In ubiquitous environment, User's location information is very important to serve personalized service to user. Previous works consider only User's locations in the big buildings and assume APs are fixed. Normal home environment, However, is consists of small spaces. And the state of APs is highly fluid. Previous research has focused on indoor localization in the building where has stationary AP environment. However, in this paper, we propose as User's Location Predicting System that finds out a space where a user is located based on Wi-Fi Fingerprint approach in home environments. The results that conducted real home environments are using the system show more than 80% accuracy.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.9
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• pp.1350-1357
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• 2012

Medical system for personal health management recently changes its paradigm from hospital service to self home care based on ubiquitous technology for healthcare anywhere at any time. The present study developed a wireless bio-signal measurement system for patients to self manage pulmonary disease and benign prostate hyperplasia(BPH), both of which are chronic diseases with increasing frequency in modern society. Velocity-type respiratory air flow transducer adapted to develop respiratory module for pulmonary disease management was simplified in structure to measure uni-directional flow since most important diagnostic parameters are evaluated on the expiratory flow signal only. Standard weight measurement technique was introduced to obtain urinary flow signal for BPH management. Three load cell signals were acquired for averaging to minimize noise, followed by accuracy evaluation. Transmission and receiver modules were also developed with user program for wireless communication. Averaged relative errors were 2.05 and 1.02% for respiratory volume and maximal flow rate, respectively, and the relative error was 2.17% for urinary volume, demonstrating that both modules enabled very accurate measurements. Wireless communication distance was verified within 15m, long enough for home care application. The present system allows the user to select a necessary measurement module on a particular health demand and to immediately provide the self-test results, thus better quality health care would be possible.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.771-772
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• 2011

본 연구에서는 최근 네트워크 기술의 발전으로 가정 내 정보가전기기의 네트워크가 중요해지는 점에 따라 기존의 네트워크 기반의 홈 오토메이션 시스템의 단점을 극복할 HCAS(implementation of house customize automation system based on smart-phone)를 구현하고자 하였다. 기존의 단점으로는 필요한 기능을 사용자에 따라 쉽게 변경하지 못하는 점과 홈 오토메이션 시스템의 높은 비용 등이 있다. 이러한 단점을 보완하기위해 Customize 즉, 사용자의 선택에 따라 제어 가능한 가전기기의 추가 및 제거가 가능한 기능을 구현하였고 ZigBee기술을 사용함으로써 저 전력 무선네트워크를 구현하였다. 그리고 최근의 이슈인 스마트폰을 이용함으로써 기존의 월패드형 이나 리모컨형의 불편한 휴대성을 보완하였고 직관적이며 이미지기반의 사용자 인터페이스는 HCAS의 사용자들이 시스템 제어를 조금 더 편리하고 쉽게 할 수 있게 하였다. 또한 실제로 제작한 모델 하우스에 적용시켜보고 추후의 연구 방향을 제시 하였다.

• Electronics and Telecommunications Trends
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• v.20 no.2 s.92
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• pp.83-92
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• 2005

유비쿼터스 환경의 현실화와 일반화의 시발점인 홈 네트워크 기술은 PC와 노트북, 프린터, 냉장고, DTV, 오디오/비디오를 포함하는 댁내의 모든 가전기기들을 하나의 네트워크로 연결함으로써 사용자가 언제 어디에 있든 인터넷을 이용하여 댁내의 상황을 모니터링하고 모든 기기들을 제어할 수 있게 해주는 기술이다. 현재 대부분의 기업들은 각자 회사의 네트워크를 보호하기 위하여 방화벽(firewall)이나 침입탐지시스템(intrusion detection system) 및 가상 사설망(virtual private network) 등의 방어책을 응용하고 있지만, 홈 네트워크는 기업과 비교하여 규모면에서나 보안 기술에 대한 고려 및 응용이 활발하지 않다. 이러한 다양한 보안 정책은 다가올 유비쿼터스 홈 네트워크 환경에서의 중추적 역할을 해야 될 홈 서버의 중요한 역할 중 하나이다. 따라서 본 문서의 유비쿼터스 홈 네트워크 환경에서 홈 서버의 보안 요구사항 및 구현방안들을 살펴 본다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.281-283
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• 2012

유비쿼터스(Ubiquitous)를 주제로 현대사회의 흐름을 반영한 스마트하고 편리한 시스템 구축을 목표로 한다. 현재 국내 스마트폰 사용자가 2천만명을 돌파하였고, 경제활동인구 2,500만명 중 80%가 스마트폰을 사용하고 있는 것으로 나타난다. 이러한 시대 흐름에 맞는 스마트폰을 활용한 편리함과 가정의 보안을 고려, Mindstorms NXT를 활용한 출입문 관리 시스템 및 Smart Home Security 시스템이다.

• Journal of the Korean Institute of Intelligent Systems
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• v.17 no.2
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• pp.244-251
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• 2007

Intention reading technique is essential to provide personalized services toward more convenient and human-friendly services in complex ubiquitous environment such as a smart home. If a system has knowledge about an user's intention of his/her behavioral pattern, the system can provide mote qualified and satisfactory services automatically in advance to the user's explicit command. In this sense, learning capability is considered as a key function for the intention reading technique in view of knowledge discovery. In this paper, ore introduce a personalized media control method for a possible application iii a smart home. Note that data pattern such as human behavior contains lots of inconsistent data due to limitation of feature extraction and insufficiently available features, where separable data groups are intermingled with inseparable data groups. To deal with such a data pattern, we introduce an effective engineering approach with the combination of fuzzy logic and probabilistic reasoning. The proposed learning system, which is based on IFCS (Iterative Fuzzy Clustering with Supervision) algorithm, extract probabilistic fuzzy rules effectively from the given numerical training data pattern. Furthermore, an extended architectural design methodology of the learning system incorporating with the IFCS algorithm are introduced. Finally, experimental results of the media contents recommendation system are given to show the effectiveness of the proposed system.

• Journal of information and communication convergence engineering
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• v.4 no.2
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• pp.67-70
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• 2006

A distributed healthcare monitoring system prototype for clinical and trauma patients was developed, using wireless sensor network node. The proposed system aimed to measure various vital physiological health parameters like ECG and body temperature of patients and elderly persons, and transfer his/her health status wirelessly in Ad-hoc network to remote base station which was connected to doctor's PDA/PC or to a hospital's main Server using wireless sensor node. The system also aims to save the cost of healthcare facility for patients and the operating power of the system because sensor network is deployed widely and the distance from sensor to base station was shorter than in general centralized system. The wireless data communication will follow IEEE 802.15.4 frequency communication with ad-hoc routing thus enabling every motes attached to patients, to form a wireless data network to send data to base-station, providing mobility and convenience to the users in home environment.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.695-698
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• 2007

The control of electrical appliances residing in the home network can be accomplished via Internet with the UPnP expansion without modifying an existing UPnP. In this paper, we propose the Internet Gateway that consists of an UPnP IGD(Internet Gateway Device) DCP(Device Control Protocol) and an UPnP Bridge as a system to control electrical appliances of home network. UPnP IGD DCP is to enable the configurable initiation and sharing of Internet connections as well as assuring advanced connection-management features and management of host configuration service. It also supports transparent Internet access by non-UPnP-certified devices. UPnP Bridge searches for local home network devices by sending control messages, while control point of UPnP Bridge looks up devices of interest on the Internet, subsequently furnishing the inter-networking controlling among devices which belong to different home network systems. With our approach, devices on one home network can control home electrical appliances on the other hone network via Internet through IGD DCP with control commands of UPnP.