• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2005년도 추계학술발표대회 및 정기총회
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• pp.1291-1294
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• 2005

소프트웨어 스트리밍[1][2]은 프로그램 설치 및 실행을 위하여 서버로부터 데이터 전송이 진행중인 동안에도 PC, PDA, 휴대용 개인 컴퓨터, 휴대 전화 등과 같은 데스크 탑 또는 이동 연산장치 상에서 미설치 소프트웨어의 실행이 즉각적으로 이루어지도록 하는 기능이다. 즉, 소프트웨어 스트리밍 기술을 사용하면 사용자가 다운로드, 압축해제, 인스톨과 시스템 재구성이라는 일련의 과정이 완료될 때까지 기다릴 필요 없이 최소한의 다운로드 후에 해당 소프트웨어가 곧바로 실행될 수 있도록 해준다. 응용프로그램을 실행하는데 필요한 첫번째 실행 블록이 메모리에 적재되고 기본적인 환경설정을 마치자마자 나머지 블록들이 다운로드되고 설치되기도 전에 실행될 수 있기 때문에 스트리밍 시스템은 응용 프로그램의 실행준비 시간을 대폭 줄일 수 있게 해준다. 게다가, 응용프로그램 실행시 실제로 사용되지 않는 대부분의 블록들은 서버로부터 다운로드 받지 않아도 된다. 그 결과, 메모리와 대역폭 같은 리소스의 활용이 절약된다. 이러한 스트리밍 시스템을 사용하면 사용자는 다양한 공개 또는 상업용 응용프로그램을 광범위하게 지원하는 사용자 투명성을 가진 가상 소프트웨어 컴퓨팅 환경을 만들 수 있다. 본 논문에서는 프로그램 등록, 환경 변수 설정, 그리고 구성파일과 관련된 컴포넌트들의 자동 설치 기능들을 제공함으로서 네트워크를 통하여 소프트웨어를 스트리밍하고 실행해주는 Software On-Demand(SOD)스트리밍 시스템을 설계 및 구현한다. 또한 구현된 SOD 스트리밍 시스템의 성능측정 실험환경을 구축하고 실험 결과를 이용하여 성능분석을 행한다.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2005년도 추계학술발표대회 및 정기총회
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• pp.1121-1124
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• 2005

소프트웨어 스트리밍[1]은 프로그램 설치 및 실행을 위하여 서버로부터 데이터 전송이 진행중인 동안에도 PC, PDA, 휴대용 개인 컴퓨터, 휴대 전화 등과 같은 데스크 탑 또는 이동 연산장치 상에서 미설치 소프트웨어의 실행이 즉각적으로 이루어지도록 하는 기능이다. 즉, 소프트웨어 스트리밍 기술을 사용하면 사용자가 다운로드, 압축해제, 인스톨과 시스템 재구성이라는 일련의 과정이 완료될 때까지 기다릴 필요 없이 최소한의 다운로드 후에 해당 소프트웨어가 곧바로 실행될 수 있도록 해준다. 응용프로그램을 실행하는데 필요한 첫번째 실행 블록이 메모리에 적재되고 기본적인 환경설정을 마치자마자 나머지 블록들이 다운로드되고 설치되기도 전에 실행될 수 있기 때문에 스트리밍 시스템은 응용 프로그램의 실행준비 시간을 대폭 줄일 수 있게 해준다. 게다가, 응용프로그램 실행시 실제로 사용되지 않는 대부분의 블록들은 서버로부터 다운로드 받지 않아도 된다. 그 결과, 메모리와 대역폭 같은 리소스의 활용이 절약된다. 이러한 스트리밍 시스템을 사용하면 사용자는 다양한 공개 또는 상업용 응용프로그램을 광범위하게 지원하는 사용자 투명성을 가진 가상 소프트웨어 컴퓨팅 환경을 만들 수 있다. 본 논문에서는 리눅스 환경에서 설계 구현된 Software On-Demand(SOD) 스트리밍 시스템을 소개하고, SOD 스트리밍 시스템의 성능측정을 위한 소프트웨어를 설계한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.455-458
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• 2009

Bluetooth technology has been applied to mobile device, personal computers, peripherals, information and variety of consumer electronics. Not also the original Bluetooth technology must be especially focused in the application of mobile phone but applications such as wireless headsets and dial-up networking may be increased. However Bluetooth is so only focused to wireless headset application that the various software applications are presently ignored. In this paper, we propose the framework design to implement Bluetooth profile for kiosk servers, which can be used in Theater, train station, bank, government and public offices. Then mobile devices capable of processing user's input/output can be remotely accessed in these servers by using Bluetooth module and AP, although Kiosk servers are only processed user input data.

• The Journal of the Korea institute of electronic communication sciences
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• 제14권3호
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• pp.613-618
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• 2019

EMF (Electromagnetic Field) is a valuable resource for living in a knowledge-based information society. The EMF is used in home appliances that make our lives easy and convenient, and in telecommunication devices such as mobile phones, personal computers, medical devices and broadcasting towers. However, the biological hazards associated with EMF exposure are also increasing in signal from telecommunication devices. Studies of the effects of EMF exposure on humans have been conducted for a long time, but it has not yet been demonstrated whether the EMF effect is harmful. In this paper, we examine the electromagnetic field emitted from various electronic devices around living and its effect.

• Journal of the Institute of Electronics Engineers of Korea SD
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• 제42권11호
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• pp.1-8
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• 2005

In this paper, we present design and prototyping of a low-cost, integrated multi-functional micro health sensor chip that can be used or embedded in widely consumer devices, such as cell phone and PDA, for monitoring environmental condition including air pressure, temperature and humidity. This research's scope includes basic individual sensor study, architecture for integrating sensors on a chip, fabrication process compatibility and test/evaluation of prototype sensors. The results show that the integrated TPH sensor has good characteristics of ${\pm}\;1\%FS$ of linearity and hysteresis for pressure sensor and temperature sensor and of ${\pm}\;5\%FS$ of linearity and hysteresis But if we use 3rd order approximation for humidity sensor, full scale error becomes much smaller and this will be one of our future study.

• Korean Journal of Optics and Photonics
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• 제21권2호
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• pp.53-60
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• 2010

An integrated light guide plate (LGP) was designed for liquid crystal displays (LCD) without using prism and diffuser sheets. The integrated LGP is textured with micro-patterns on both the top and bottom surfaces. The textures effectively substitute for a single prism-sheet and a diffuser sheet in LCD displays without decreasing the brightness and uniformity. A LCD display with our integrated light guide is simulated to give average luminance of 4560 cd/$m^2$, luminance uniformity of 83% horizontal viewing angle $60^{\circ}$ and vertical viewing angle $56^{\circ}$. Therefore an ultra thin (slim) back light unit can be constructed with fewer optical sheets, which reduces the manufacturing cost and so improves price competitiveness.

• Journal of the Institute of Electronics Engineers of Korea CI
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• 제47권5호
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• pp.50-60
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• 2010

For the last half a century, the personal computer and software industries have been prosperous due to the incessant evolution of computer systems. In the 21st century, the embedded system market has greatly increased as the market shifted to the mobile gadget field. While a lot of multimedia gadgets such as mobile phone, navigation system, PMP, etc. are pouring into the market, most industrial control systems still rely on 8-bit micro-controllers and simple application software techniques. Unfortunately, the technological barrier which requires additional investment and higher quality manpower to overcome, and the business risks which come from the uncertainty of the market growth and the competitiveness of the resulting products have prevented the companies in the industry from taking advantage of such fancy technologies. However, high performance, low-power and low-cost hardware and software platforms will enable their high-technology products to be developed and recognized by potential clients in the future. This paper presents such a platform for industrial embedded systems. The platform was designed based on Telechips TCC8300 multimedia processor which embedded a variety of parallel hardware for the implementation of multimedia functions. And open-source Embedded Linux, TinyX and GTK+ are used for implementation of GUI to minimize technology costs. In order to estimate the expected performance and power consumption, the performance improvement and the power consumption due to each of enabled hardware sub-systems including YUV2RGB frame converter are measured. An analytic model was devised to check the feasibility of a new application and trade off its performance and power consumption. The validity of the model has been confirmed by implementing a real target system. The cost can be further mitigated by using the hardware parts which are being used for mass production products mostly in the cell-phone market.

• Korean Journal of Agricultural and Forest Meteorology
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• 제19권3호
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• pp.180-194
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• 2017

Agricultural hazards management technology, which would allow individual farms to respond preemptively, has been developed. A preliminary system developed in the previous study provides precise weather forecasts by farms, notification of weather hazards by crops and delivery of response guidelines (http://www.agmet.kr). Although the GIS map-based alarm system has been implemented for a number of farmers and their farms, its user interface was not designed for individual users who seek information at their farms. In this study, we have developed a mobile application to provide early warnings of weather hazards up to 10 days in advance. A set of information including field-specific weather, crop growth stages and weather hazard alerts can be delivered to individual farmers through their mobile phone. This would guide users to access the map-based system using their smartphone to obtain field-specific weather information by the growth stage of cultivated crops. This would help the farmers make the better use of the existing weather-hazard GIS map-based alarm system.

• Journal of the Institute of Electronics and Information Engineers
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• 제51권12호
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• pp.20-29
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• 2014

Recently, LTE is preparing to make a new leap forward LTE-A all over the world. As LTE privides high speed service, the role of mobile phones seems to change from voice to data service. According to Cisco, global mobile data traffic will increase nearly 11-fold between 2013 and 2018. Mobile video traffic will reach 75% by 2018 from 66% in 2013 in Korea. However, voice service is still the most important role of mobile phones. Thus, controllability of throughput and low BLER is indispensable for high-quality VoIP service among various type of traffic. Although the maximum AMR-WB, 23.85 Kbps is sufficient to a VoIP call, it is difficult for the LTE which can provide tens to hundreds of MB/s may not keep the certain level VoIP QoS especially in the cell-edge area. This paper proposes a new scheduling algorithm in order to improve VoIP performance after analyzing various scheduling algorithms. The proposal is the technology which applies more priority processing for VoIP than other applications in cell-edge area based on two-tier scheduling algorithm. The simulation result shows the improvement of VoIP performance in the view point of throughput and BLER.