• 디지털산업정보학회논문지
• /
• 제8권1호
• /
• pp.139-145
• /
• 2012

This paper shows a novel interference cancellation method of relay utilizing to the CGM algorithm in wireless communication environments. It is a problem that relay have interference cause by feedback signal of it. CGM algorithm obtained weight value that can remove the interference due to feedback signal of relay. In this paper, we confirm that performance of CGM algorithm is far superior with suitable cancellation value to remove the feedback signal. Also, we implement CGM module to verify the real-time processing of CGM algorithm using to DSP. Based on the analysis from computer simulation, it is observed that proposed algorithm is suitable for the relay in time-varying environment.

• 한국생산제조학회지
• /
• 제24권1호
• /
• pp.103-109
• /
• 2015

This paper introduces a multi-purpose smart fusion sensor. Normally, this type of sensor can contribute to energy savings specifically related to lighting and heating/air conditioning systems by detecting individuals in an office building. If a fire occurs, the sensor can provide information regarding the presence and location of residents in the building to a management center. The system consists of four sensors: a thermopile sensor for detecting heat energy, an ultrasonic sensor for measuring the distance of objects from the sensor, a fire detection sensor, and a passive infrared sensor for detecting temperature change. The system has a wireless communication module to provide the management center with control information for lighting and heating/air conditioning systems. We have also demonstrated the usefulness of the proposed system by applying it to a real environment.

• 한국콘텐츠학회:학술대회논문집
• /
• 한국콘텐츠학회 2005년도 추계 종합학술대회 논문집
• /
• pp.359-363
• /
• 2005

본 논문에서는 다양한 무선 통신 채널 환경에서 레일리 페이딩과 라이시안 페이딩 등을 모두 포함할 수 있고 이동 통신과 위성 통신에서도 적용할 수 있는 페이딩 모델로서 나카가미 페이딩 모델을 도입하고 전자기기에서 방출되는 임펄스 간섭파를 채널 환경으로 모델링하여 결합변조기법을 채용한 DS-CDMA 시스템의 성능을 분석하였다. 변조방식으로는 대역폭 효율 개선을 위해 MFSK와 MDPSK를 고려한 결합변조기법을 채용하였으며 실내 무선 페이딩 채널로써 직접파대 반사파 전력비를 나카가미 페이딩 심도지수 m으로 산출하여 임펄스 지수A와 가우스 잡음 전력 대 임펄스 잡음 전력비 $\Gamma'$를 파라미터로 하여 시스템 오율성능을 분석하였다.

• Journal of Multimedia Information System
• /
• 제2권4호
• /
• pp.327-332
• /
• 2015

Recently, as microcomputers and sensors have been miniaturized due to dropdown of their market rates, this lead to a favorable environment for implementing the Internet of Things. Smart clothing refers to a system which can be wearable or portable, and allows people to communicate or conduct sensing. Applying the Internet of things, the role of the server computer is to receive and process data obtained from the sensor. An ordinary PC can act as a server but during the implementation of IoT, a PC has limited application due to a large size and the inconvenient portability. This study proposes a model that allows a variety of functions while implementation with the server from the sensing using the Arduino and Raspberry Pi. If we apply this proposed model, everyone can easily and inexpensively experience mobile IoT system.

• 디지털산업정보학회논문지
• /
• 제13권3호
• /
• pp.43-51
• /
• 2017

MANET consists of only wireless nodes having limited processing capability. It processes routing and data transmission through cooperation among each other. And it is exposed to many attack threats due to the dynamic topology by movement of nodes and multi-hop communication. Therefore, the reliability of transmitted data between nodes must be improved and security of integrity must be high. In this paper, we propose a method to increase the reliability of transmitted data by providing a secure cryptography protocol. The proposed method used a hierarchical structure to provide smooth cryptographic services. The cluster authentication node issues the cluster authentication key pair and unique key to the nodes. The nodes performs the encryption through two steps of encryption using cluster public key and block encryption using unique key. Because of this, the robustness against data forgery attacks was heightened. The superior performance of the proposed method can be confirmed through comparative experiment with the existing security routing method.

• 제어로봇시스템학회논문지
• /
• 제12권10호
• /
• pp.1022-1028
• /
• 2006

A portable ECG sensor module and monitoring system which has the powerline noise reduction and the baseline wander removal is proposed. A small-szie ECG sensor H/W module with the 8-bits microprocessor is implemented. The ECG waveform can be inspected anytime with PDA in real time, and transmitted to the PC through wireless LAN. Portable ECG system can offer the environment that give the lasting medical service to the elderly and the long-time hospitalized patients at the wanted place, and the system can be attached to the chair, wheel chair, treadmill, elderly walker and used to monitor the health condition of man

• 한국생산제조학회지
• /
• 제21권3호
• /
• pp.507-515
• /
• 2012

Recently RFID(Radio Frequency Identification) technology advances in wireless communication technologies are bringing new challenges. But RFID tag packaging technology has been lagging compared to the demand, so this technology is being required to improve productivity and reliability. This study is performed on FMEA, reliability at development level and analysis failure mode through environment and mechanical test. Robust design is applied to search the optimized condition of factor and RFID tag packaging should be satisfied with high MTTF.

• Journal of Information Technology Applications and Management
• /
• 제14권2호
• /
• pp.1-10
• /
• 2007

The ubiquitous computing system is expected to be widely utilized in digital home, logistics control, environment/disaster management, medical/health-care services and other applications. The ubiquitous sensor network (USN) is a key infra-structure of this system. Nodes in the USN are exposed to adverse environments and required to perform their missions with very limited power supply only. Also the sensor network is composed of much more nodes. In case some node consumes up its power capacity under a certain required level, the network topology should change and re-routing/ re-transmission of data is necessitated. Resultantly communication protocols studied for conventional wireless networks or ad-hoc networks are not suitable for the sensor network. Schemes should be devised to control the efficient usage of node power in the sensor network. This paper proposes a routing algorithm to enhance the efficiency of power consumption for USN node and analyzes its performance by simulation.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2013년도 추계학술대회
• /
• pp.435-437
• /
• 2013

This paper proposes a system composed of wireless sensor network and cloud to monitor storage environment of pharmaceutical products. Integration of sensor networks to cloud is an emerging architecture offering the benefits of internet for monitoring to be done easily and remotely from anywhere and anytime and at the same time freeing the sensor network from processing, analysis, computational and storage of sensor data.

• 한국태양에너지학회 논문집
• /
• 제28권6호
• /
• pp.58-63
• /
• 2008

It is essential to investigate the structure and the main characteristic of Home USN (Ubiquitous Sensor Network) technologies in built ubiquitous environment while designing bio-sensors. For this study, Thermistor elements and Thermopile black body have been selected to implement ubiquitous technologies for bio-sensors and wireless network such as WiBro has been used to transfer sensing data to the BSN (Bio-Sensor Network) gateway. It is certain that efficiency of ubiquitous space design is improved if main components of each specific sensor network are analyzed precisely in digital way and corresponding communication modules are prepared accordingly. Ubiquitous technology, in conclusion, has to be applied not only with systematical mechanism or electronic setting but in human-centered atmosphere as well, keeping with deep consideration for bio-housing service factors in eco-friendly surrounding.