• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.5
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• pp.191-196
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• 2016

Recently, power dissipation is a very significant issue not only in embedded systems and mobile devices but also in high-end modern processors. Especially, by the prevalent use of smart phones and tablet PCs, low power consumption of microprocessors is requisite. In this paper, a fast power measurement tool for a high performance microprocessor based on the trace-driven simulator has been developed. The power model of the microprocessor consists of complex combinational circuits, array structures, and CAM structures. Using SPEC 2000 benchmarks as input, the trace-driven simulation has been performed to estimate the average power dissipation of each program.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.07a
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• pp.215-218
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• 2012

반도체 기술 및 방송통신기술의 발달에 따라 소비자는 복잡하고 다양한 서비스 환경을 접하고 있으며, 개인당 소비되는 콘텐츠의 양은 기하급수적으로 증가 되고 있다. 스마트폰과 같은 멀티미디어기기의 발전으로 기존의 단순 시청에서 벗어나 멀티미디어 검색과 추천과 같은 다양한 서비스들이 제공되고 있으며, 웹과 인터넷을 기반으로 하는 정보기술은 모바일 전자 기술의 발달에 따라 데스크톱이라는 공간적인 한계를 벗어나 유기적인 유비쿼터스 환경으로 변화하고 있다. 이와 같이 소비자들이 접하는 멀티미디어의 양이 증가됨에 따라, 멀티미디어를 검색하기 위한 다양 서비스들이 사업자들을 통해 제공되고 있다. 그러나 사업자들이 구축한 서버들은 공유되어지지 못하며, 공유되더라도 공유하기 위한 방법이 제각각이다. 이에 MPEG에서는 멀티미디어 콘텐츠를 검색하기 위한 질의 구조를 표준화 하여, 서비스 제공자 및 소비자들에게 유용한 검색 인터페이스를 제공하였다. 이에 본 논문에서는 MPEG Query Format에 기반 하여 임베디드 환경에서 광대한 양의 음악 콘텐츠에서 사용자가 원하는 허밍 질의를 편리하게 검색하기 위한 방법을 성계 및 구현한다.

• Proceedings of the Korea Contents Association Conference
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• 2006.05a
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• pp.156-159
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• 2006

Self management of chronic asthma is of great importance, since the disease could lead the patient into an emergent situation. In the present study, we describe design and implementation of a personal digital assistant(PDA) based asthma management system for personal application including symptom and medication to prevent from the potential exacerbation of the disease. The software program was written by the Visual C++ tool in the mobile computing environment and Object Store was applied for data management. User friendly GUI environment was provided for the patient to input his/her daily condition and self treatment such as medication for successful management. The input screen design substituted for keyboard input to a mouse in order to easy to select an item and minimize the keyboard input. The implementation results of this system., Real-time data collection and process were possible and be able to have been carried effectively out a continuous symptom, a medication of asthma patients, risk management.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.634-637
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• 2007

Self management of chronic asthma is of great importance, since the disease could lead the patient into an emergent situation. In the present study, we describe implementation of a personal digital assistant(PDA) based asthma management system for personal application including symptom and medication to prevent from the potential exacerbation of the disease. The software program was written by the Visual C++ tool in the mobile computing environment and Object Store was applied for data management. User friendly GUI environment was provided for the patient to input his/her daily condition and self treatment such as medication for successful management. The input screen design substituted for keyboard input to a mouse in order to easy to select an item and minimize the keyboard input. The implementation results of this system., Real-time data collection and process were possible and be able to have been carried effectively out a continuous symptom, a medication of asthma patients, risk management.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.4
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• pp.800-807
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• 2007

Web services came true a services integration, but the XML document decreases the efficiency or the whole application program with connects frequently in relatively slow communication media like network environment embedded system or use the resource limited small-sized instrument like mobile. Thereupon, ITU-T and ISO/IEC suggested encoding standard of binary XML. In this paper, implementation, of Fast XML encoding system through introduction Fast Infoset algorithm and Fast Schema algorithm for web services increase performance. And, offered of test bed that build of Fast Web Services system through Fast XML Encoder.

• Journal of Broadcast Engineering
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• v.25 no.2
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• pp.200-207
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• 2020

Recently, deep neural networks such as CNN are showing excellent performance in various fields such as image classification, object recognition, visual quality enhancement, etc. However, as the model size and computational complexity of deep learning models for most applications increases, it is hard to apply neural networks to IoT and mobile environments. Therefore, neural network compression algorithms for reducing the model size while keeping the performance have been being studied. In this paper, we apply few compression methods to CNN models and evaluate their performances in the embedded environment. For evaluate the performance, the classification performance and inference time of the original CNN models and the compressed CNN models on the image inputted by the camera are evaluated in the embedded board equipped with QCS605, which is a customized AI chip. In this paper, a few CNN models of MobileNetV2, ResNet50, and VGG-16 are compressed by applying the methods of pruning and matrix decomposition. The experimental results show that the compressed models give not only the model size reduction of 1.3~11.2 times at a classification performance loss of less than 2% compared to the original model, but also the inference time reduction of 1.2~2.21 times, and the memory reduction of 1.2~3.8 times in the embedded board.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.47 no.7
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• pp.52-60
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• 2010

In this paper, we propose a dynamic power management framework for multi-core systems. We reduced the power consumption of multi-core processors such as Intel Centrino Duo and ARM11 MPCore, which have been used at the consumer electronics and personal computer market. Each processor uses a different technique to save its power usage, but there is no embedded multi-core processor which has a precise power control mechanism such as dynamic voltage scaling technique. The proposed dynamic power management framework is suitable for smart phones which have an operating system to provide multi-processing capability. Basically, our framework follows an intuitive idea that reducing the power consumption of idle cores is the most effective way to save the overall power consumption of a multi-core processor. We could minimize the energy consumption used by idle cores with application-targeted policies that reflect the characteristics of active workloads. We defined some properties of an application to analyze the performance requirement in real time and automated the management process to verify the result quickly. We tested the proposed framework with popular processors such as Intel Centrino Duo and ARM11 MPCore, and were able to find that our framework dynamically reduced the power consumption of multi-core processors and satisfied the performance requirement of each program.

• Journal of KIISE
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• v.44 no.9
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• pp.992-1004
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• 2017

To assess image quality accurately, an image quality assessment (IQA) metric is required to reflect the human visual system (HVS) properly. In other words, the structure, color, and contrast ratio of the image should be evaluated in consideration of various factors. In addition, as mobile embedded devices such as smartphone become popular, a fast computing speed is important. In this paper, the proposed IQA metric combines color similarity, gradient similarity, and phase similarity synergistically to satisfy the HVS and is designed by using optimized pooling and quantization for fast computation. The proposed IQA metric is compared against existing 13 methods using 4 kinds of evaluation methods. The experimental results show that the proposed IQA metric ranks the first on 3 evaluation methods and the first on the remaining method, next to VSI which is the most remarkable IQA metric. Its computing speed is on average about 20% faster than VSI's. In addition, we find that the proposed IQA metric has a bigger amount of correlation with the HVS than existing IQA metrics.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.6
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• pp.1105-1112
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• 2022

Field data monitoring systems such as renewable energy generation and smart farm integrated control are developing from PC and server to mobile first, and various wireless communication and application services have emerged with the development of IoT technology. Low-power wide-area networks are services optimized for low-power, low-capacity, and low-speed data transmission, and data collected in the field is transmitted to designated storage servers or cloud-based data platforms, enabling data monitoring. In this paper, we implement an IoT repeater that collects field data with a single device and transmits it to a wireless carrier cloud data flat using a low-power wide-area network, and a monitoring app using it. Using this, the system configuration is simpler, the cost of deployment and operation is lower, and effective data accumulation is possible.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10a
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• pp.228-232
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• 2006

모바일폰, MP3 플레이어, PDA와 같은 개인 휴대용 임베디드 기기가 다양해지면서, 각 기기의 부팅 시간은 제품 경쟁력을 위해 개발자가 고려해야할 중요한 이슈가 되었다. 이를 위해 Disable Console[1], Kernel XIP[2], IDENoProbe[3] 등의 기술이 제안되었지만, 부팅 시간의 80%를 차지하는 디바이스 초기화와 드라이버 등록에 대한 고려가 부족하다는 점에서 한계를 가진다. 본 연구에서는 부팅 시에 불필요한 IDE나 다른 인터페이스 채널의 초기화 과정 및 디바이스 드라이버의 등록과정을 생략하고, 그 과정을 부팅이 완료된 후로 지연시킴으로써 부팅 시간을 단축시키는 방법을 제안한다. 본 연구를 이용할 경우 부팅 시에 불필요한 IDE 인터페이스 채널의 초기화를 생략함으로써 기존 시스템의 부팅 시간에 비해 약 7초 정도 (일반 리눅스 부팅 시간의 약 14.15% 개선)의 성능 향상을 기대할 수 있으며, 나아가 부팅 과정의 80% 정도를 차지하는 디바이스 드라이버의 등록 과정의 일부를 생략하여 부팅 성능을 개선할 수 있는 실험적 근거를 제시하였다.