• Journal of Korea Society of Industrial Information Systems
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• v.19 no.2
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• pp.51-58
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• 2014

As WSNs(Wireless Sensor Networks) are being deployed widely in diverse application areas, their management and maintenance become more important. Recent sensor node software takes modular software architectures in pursuit of flexible software management and energy efficient reprogramming. To realize an flexible and efficient modular architecture particularly on resource constrained mote-class sensor nodes that are implemented with MCUs(Micro-Controller Units) of a single address space. an appropriate module linking model is essential to resolve and bind the inter-module global symbols. This paper identifies a design space of module linking model and respectively their implementation frameworks. We then establish a taxonomy for module linking models by exploring the design space of module linking models. Finally, we suggest an implementation framework respectively for each module linking model in the taxonomy. We expect that this work lays the foundations for systematic innovation toward more flexible and efficient modular software architectures for WSNs.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05b
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• pp.96-102
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• 2003

Today, stage technology is developing highly by application of digital computer. Performance is composed of audio/video and acoustic technology takes very important position in field of stage technology. Generally speaking, four factors of sound are loudness, pitch, sound timbre and duration. Loudness depends on sound pressure level, yet partly related with spectrum and dulation. Pitch depends mainly on frequence and have a relation with sound pressure and duration. sound timbre depends strongly on spectrum and have a relation with frequence. In this paper, I designed a multi-microphone system which can used in broadcasting and performance stage with vicboss 200MHz-VHF wireless microphone and vicboss 900MHz-VHF wireless microphone. I also studied about multi-microphone which can use conveniently in the super play that needs many microphones. If this multi-microphone is prodused, we could expect better sound quality and a big progress in stereo recording technology.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.4
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• pp.116-124
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• 2011

For Binary CDMA network, communication can be accomplished only within a Pico-net on the boundary of management by the master station because it manages network resources of each entity. In this research, we try to overcome these limits and extend the application for Binary CDMA system to broad-band network. We suggest a new Binary CDMA router such that network is devised by cell unit and multiple Pico-net and a unique address is assigned to each Pico-cell to relaying data between Pico-cells.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.469-470
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• 2006

Surface Acoustic Wave(SAW) devices can be used to as wireless sensor elements, called SAW transponders, for measuring shysical quantities such as temperature that do not need any power supply and may be accessed wirelessly. SAW devices were fabricated on Y-Z $LiNbO_3$ piezoelectric substrate with a good temperature coefficient property. The signal response of SAW sensor on the temperature change were compared. To measure the change of SAW velocity. Temperature changed form $20^{\circ}C$ to $400^{\circ}C$ was linearly changed, the SAW sensor is application to the temperature sensor.

• Journal of information and communication convergence engineering
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• v.13 no.1
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• pp.15-20
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• 2015

The limited battery power in the mobile environment, lack of sufficient wireless bandwidth, limited resources of mobile terminals, and frequent breakdowns of the wireless network have become major hurdles in the development of mobile cloud computing (MCC). In order to solve the abovementioned problems, This paper propose a proxy-based MCC framework by adding a proxy server between mobile devices and cloud services to optimize the access to cloud services by mobile devices on the network transmission, application support, and service mode levels. Finally, we verify the effectiveness of the developed framework through an experimental analysis. This framework can ensure that mobile users have efficient access to cloud services.

• Annual Conference of KIPS
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• 2000.10b
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• pp.1063-1066
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• 2000

최근 무선통신을 이용한 이동 컴퓨팅 환경에 대하여 점차 관심이 집중되고 있다. 그런데 이런 무선통신환경을 구축하기 위해서는 기존의 유선 HTML(Hyper Text Markup Language) 문서들을 WML(Wireless Markup Language) 문서등으로 변환하는 작업이 필요하다. 이러한 오버헤드를 줄이기 위한 노력의 일환으로 WAP(Wireless Application Protocol) 게이트웨이(Gateway)를 제작하여 사용할 수 있다. 본 논문에서는 기존의 HTML 서버의 내용을 이동 무선단말기에서도 검색할 수 있도록 하는 WAP 게이트웨이에 대하여 연구한다. WAP 서버, WEB 클라이언트, 프로토콜 변환기, WML 인코더/디코더 등으로 WAP 게이트웨이를 구성하며 현재 WTP, WSP 단계에서의 설계와 구현을 하고 있으며 본 논문에서는 현재까지의 중간결과를 설명한다.

• Annual Conference of KIPS
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• 2002.11b
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• pp.1599-1602
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• 2002

IMT-2000의 상용화와 함께 무선 단말 장치와 PDA의 사용 용도가 단순히 상대방과의 통화 기능에 국한되지 않고 고속 데이터 통신이나, 멀티미디어의 대용량의 자료를 송수신하는 형태로 변화되고 있다. 이러한 변화에 따라 시공적인 제약없이 사용 가능한 무선 인터네 연구가 WAP(Wireless Application Protocol) Forum을 중심으로 활발하게 진행되고 있다[1]. 무선 인터넷 환경을 구현하기 위해서 WML(Wireless Markup Language)를 사용하여 제작한다. 본 논문에서는 사용자가 보다 편하고 빠르게 WML을 작성할 수 있도록 하기 위해서 복잡한 명령어 구조나, 태그를 몰라도 자연어의 사용만으로 WML 문서를 쉽게 저작 할 수 있는 편집기를 구현한다. 이 편집기는 Nokia 에릭슨에서 지원하는 에뮬레이터를 사용하지 않고 자체에 내장되어 있는 에뮬레이터를 통해서 직접 눈으로 확인하면서 작업할 수 있어 문서 저작의 생산성을 향상시킬 수 있는 자연어 사용을 기반으로 하는 WYSIWYG WML Editor이다.

• Annual Conference of KIPS
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• 2000.10b
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• pp.1181-1184
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• 2000

정보통신 분야의 급격한 발달은 다양한 프로토콜을 지원하는 통신 시스템의 개발 주기를 더욱 빠르게 하고 있으며, 통신 프로토콜의 체계적인 분석과 재사용성 및 확장성을 고려한 시스템의 모델링 방법에 대한 필요성을 증가시키고 있다. 본 논문에서는 이에 대한 방안으로 객체지향 방법을 이용한 프로토콜의 시스템 모델링 및 설계 방안을 제시하였다. 이를 위해 WAP(Wireless Application Protocol)의 WTP를 객체지향 모델링 언어인 UML과 통신 시스템의 명세서를 작성하고 설계하는 표준화된 언어인 SDL을 이용하여 분석하고 설계하였다.

• Annual Conference of KIPS
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• 2000.10b
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• pp.1083-1086
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• 2000

최근 무선 인터넷의 보급과 더불어 다양한 기능이 요구되고 있으며, 특히 WAP(Wireless Application Protocol)상에서 지원되는 Push 서비스의 요구가 늘어나고 있다. 본 논문에서는 무선 프로토콜인 WAP상에서 사용하는 푸시(push) 메시지의 보다 쉬운 구현을 위해 Push 서비스의 구조와 동작 원리를 소개하고 푸시 컨텐츠 생성기(Push Content Generator)의 구조와 설계에 대해 기술한다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.11a
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• pp.55-56
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• 2018

In order to reduce the risk of accidents, we proposed a construction safety management system combined with wearable device and LoRa (Low-Range Wireless Network) communication method to apply the usefulness of Internet (IoT) technology which means "everything connected". to construction safety management Management system. The proposed wearable safety device is a device that relays information exchange between wearable safety device and safety management server by LoRa wireless communication method. The safety management server can store workers bio-data and perform big data analysis. If a risk factor is determined from the analysis result, a warning is sent to the wearable safety device and the manager's application. The goal of this system is to prevent construction workers from entering the dangerous area that is not suitable for work, and to prevent safety accidents caused by human cause by detecting abnormal condition during work.