• Convergence Security Journal
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• v.15 no.6_2
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• pp.89-97
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• 2015

The Smart phone is the mobile phone added to mounted equipment miniaturized operating system of PC and wireless phone possible hardware, software modules. This study is examine about Smart phone supply spreading process and characteristic by age. And this study is wish to investigate about age-based features of the media usage attitude via a Smart phone as a reference questionnaire of KISA and KISDI. Smart phone is easy-to-use and excellent portability and mobility like Pocket PC. It is easy to information and data search anytime and anywhere unaffected by time and place. It is to possible a variety of information exchange with several acquaintances and easy to photos and video photography. Wish to improve the life satisfaction with widely using for smart phones at all ages.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.5
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• pp.125-129
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• 2016

This study has a purpose of development of mobile health monitoring system for measuring, saving and transmitting health signals by standardizing and encoding methods under the mobile environment. The system consists of a module for measuring the health signals with Bluetooth function, encoding equipment for encoding the measured health signals by a standardized encoding method so as to maintain mutual compatibility between devices, and a mobile system for saving and transmitting the encoding health signals. The proposed system was realized under the mobilet environment and has showed to be able to make good use.

• Journal of Digital Contents Society
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• v.14 no.3
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• pp.313-321
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• 2013

In recent, proliferation of mobile smart devices have led to big-data era, the importance of location-based services is increasing due to the exponential growth of trajectory related data. In order to process trajectory data, parallel processing platforms such as cloud computing and MapReduce are necessary. Currently, the researches based on MapReduce are on progress, but due to the MapReduce's properties in using batch processing and simple key-value structure, applying MapReduce framework for real time LBS is difficult. Therefore, in this research we propose a suitable system design on efficient indexing and search techniques for real time service based on detailed analysis on the properties of MapReduce.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.96-97
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• 2015

본 논문에서는 MLT 멀티미디어 프레임워크를 이용하여 홍보동영상을 자동 합성하는 웹 기반 서비스 프레임워크 상에서의 연동 인터페이스를 개발한다. 소상공인 홍보영상 제작시스템은 일반 소상공인들의 업종 정보와 잠재고객 특성정보를 기반으로 사진이나 동영상을 입력하면 관련된 홍보동영상을 자동으로 출력하는 시스템이다. 인지도가 높고 기능이 다양한 상용 소프트웨어들이 다수 존재하지만 소상공인들이 쉽고 저렴하게 사용할 수 있는 시스템 구성을 위해 본 논문에서는 공개소스 프로젝트인 MLT 멀티미디어 프레임워크를 사용한다. LGPL에 따라 개발 중인 MLT는 멀티미디어 콘텐츠들을 쉽게 조합하고 표시하는 필수 기능들을 제공하며 플러그인 구조를 채용하여 신규기능 탑재 및 효과추가도 가능하다. 하지만 MLT는 영상생성에 필요한 저수준 기능들을 주로 제공하므로 상위 계층에서 입력된 정보를 반영하여 홍보영상을 만드는 시스템 구성을 위해서는 상위 모듈들과의 연동 인터페이스의 설계 및 구현이 필요하다. 따라서 본 논문에서는 홍보전략 및 홍보의도와 같은 상위수준의 정보를 고려하여 MLT로 동영상을 실제 합성할 수 있도록 하는 계층화된 연동 구조를 제안한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2010.07a
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• pp.319-322
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• 2010

본 논문에서는 저가의 비용으로 구축이 가능한 USB 인터페이스용 PC 카메라를 이용한다. 사람의 침입이나 사람의 움직임을 감시할 필요가 있는 장소에 카메라를 설치하여 영상을 계속 감시한다. 감시가 필요한 장소에 설치된 각 카메라의 영상에 변화를 저장하여 기록하는데 있어서, 비교적 적은 비용이 필요하다. 또한 감시가 필요한 장소를 보다 안전하고 정확하게 감시할 수 있는 무인 침입탐지시스템에 영상처리와 영상인식 기술을 이용하여 실시간 감시시스템을 구현한다. 구현한 시스템은 웹을 기반으로 다양한 원격지의 화상 자료의 신속한 전송, 정확성의 구현, 특정 움직임의 캡처 및 선택, 검색, 자동 움직임 감지 등의 장점을 제공한다. 또한 독자적 시스템을 제공하여 다수의 시스템을 영상 입력 서버로 이용이 가능하도록 하였다. 뿐만 아니라, 서버에 C/S 형태의 시스템도 함께 제공하여, 영상인식 모듈을 탑재할 수도 있다. 덧붙여 인터넷을 통한 자료의 전송기술 및 QoS 만족을 위한 자료의 압축 및 품질 향상 기술을 적용하여 원격 출력과 원격 전송이 가능하여 저장 장치의 유지 관리 및 설치면에서 많은 경제적 이점이 있다.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.2
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• pp.361-366
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• 2017

The abnormal state of the main equipment across the industry is accompanied by abnormal rise of temperature, change in the vibration and noise. In this study, we developed a smart sensing module equipped with BLE, and developed a smart sensing device that can detect abnormal vibration due to its own flaws of the equipment by interfacing with an MEMS-based acceleration sensor. The smart sensing device developed in this study can be easily installed in a small space and can monitor the vibration status of the equipment in real time, and can easily inform the user of the steady state and the problem occurrence status with array LED display.

• Journal of IKEEE
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• v.20 no.1
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• pp.107-110
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• 2016

In this paper, an IEEE 802.15.4 LR-WPAN 868/915 MHz ZigBee transceiver for IoT systems was designed and implemented. Non-coherent demodulation was exploited to satisfy ${\pm}80ppm$ frequency offset recommended in IEEE 802.15.4 LR-WPAN. Variable bitrate was supported according to operation modes. SPI module was embedded to connect various MCUs. The designed Zigbee transceiver was described in Verilog HDL and it was synthesized and verified in $0.18{\mu}m$ process. Its gate count was about 32,000 gates.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.6
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• pp.597-604
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• 2016

In this paper, we develope a speed control system of a BLDC motor for handpieces used in beauty applications. To reduce implementation cost, the control system utilizes hall sensors embedded in BLDC motors for speed estimation. The developed power module of a motor uses only 220V home voltage, so that the control system does not need any other power sources. An over-speed limit controller is also developed to slow down a motor when the speed goes up rapidly for a moment upon some heavy load is removed. The control system is designed to operate a handpiece with speed in the range of 5,000~30,000 RPM. Experiment results show the validity of the developed system, which maintains the speed of a motor steady even though a load is varied.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.6
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• pp.616-620
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• 2008

High reliability is the important parameter on designing satellite system and it is also important to design hish speed data processing unit. To make high speed satellite processing unit, it is needed to utilize space processor, high speed data interface technology, mass memory control technology and data protection technology under space radiation environment.

• The Transactions of the Korean Institute of Power Electronics
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• v.25 no.2
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• pp.79-86
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• 2020

This study examines the power generation characteristics of a vehicle rooftop photovoltaic module with urban driving conditions. Actual test data with an illuminometer and a thermometer were used to analyze the power generation characteristics of the vehicle rooftop photovoltaic module. In addition, the power generation characteristics were analyzed in terms of urban driving conditions, irradiance, ambient temperature, and photovoltaic module temperature. This study also analyzes the power generation characteristics of the vehicle rooftop photovoltaic module with urban driving conditions through a wavelet transform filtering method. The power generation characteristics of the vehicle rooftop photovoltaic module with urban driving conditions depend on the change in irradiance rather than that in photovoltaic module temperature.