• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.299-302
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• 2000

Various types of measuring devices are used for reverse engineering and inspection in different fields of industry such as automotive, aerospace, computer graphics, and home appliance. In order to measure a part easily and efficiently, it is important to select appropriate measuring device considering the characteristics of each measuring machine and part information. In this research, an optimal measuring device selection system using neural networks is proposed. There are two major steps: Firstly, the measuring information such as curvature, normal, type of surface, edge, and facet approximation is extracted from the CAD model. Second, the best suitable measuring device is proposed using the neural network system based on the knowledge of the measuring parameters and the measuring resources. An example of machine selection is implemented to evaluate the performance of the system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.754-757
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• 2003

The implementation of home network systems In ubiquitous computing environments requires middleware that provides a method to control and operate home appliance devices. The Universal Plug and Play (UPnP), which is based on the IPv4 protocol and running on a PC, consists of UPnP devices that provide relevant services and control points that control the devices. However, It is inappropriate to Implement UPnP devices on a PC, since the implementation on a PC requires much space and electrical power. In this paper, a small embedded home network device equipped with UPnP middleware is implemented on an embedded GNU/Linux system running on an ARM9 platform, in order to deal with such problems.

• Journal of Information Processing Systems
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• 제17권3호
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• pp.505-517
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• 2021

This research presented an implementation of autostereoscopic virtual three-dimensional (3D) button device as non-contact style. The proposed device has several characteristics about visible feature, non-contact use and artificial intelligence (AI) engine. The device was designed to be contactless to prevent virus contamination and consists of 3D buttons in a virtual stereoscopic view. To specify the button pressed virtually by fingertip pointing, a simple deep learning network having two stages without convolution filters was designed. As confirmed in the experiment, if the input data composition is clearly designed, the deep learning network does not need to be configured so complexly. As the results of testing and evaluation by the certification institute, the proposed button device shows high reliability and stability.

• International Journal of Computer Science & Network Security
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• 제21권1호
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• pp.152-161
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• 2021

The paper focuses on Device-to-device (D2D) Architectures evaluation frameworks. D2D communication and discovery can improve spectrum usage efficiency and optimize the tradeoffs between throughput and energy consumption. The target operation modes involve both indirect communication between two nodes via a base station or the direct communication among proximal nodes, enabling use cases that can support communications out of cellular coverage, as well as low end-end delay requirements. The paper will present the architectural evolution of D2D networks within 3GPP standardization and will highlight key network functionalities and signaling protocols. It will also identify key analytical and simulation models that can be used to assess the performance and energy efficiency of resource allocation strategies, and it will present a suitable cross-layer integrated framework.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1003-1006
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• 2004

In this paper have developed a system for monitoring and processing the real time sensor data in remote site through network. For realizing this system, measurement equipment and protocol are used to transmit the measurement data to remote server and to process measurement data. In server part, the received data from remote site sensor is converted to text or graphic charts for user. The measurement device in sensor part receives the sensor data form sensor and store the received data to its internal memory for transmitting data to server part through Internet. Also the measurement device can receive data form server. The temperature sensor is connected to the measurement device located in laboratory and the measurement device measures temperature of laboratory which can be confirmed by user through Internet. We have developed a server programworking on the Linux to store measurement data from measurement device to server memory. The program is use for SNMP(Simple Network Management Protocol) to exchange data with measurement device. Also the program changes the measurement data into text and graphic charts for user display. The program is use apache PHP program for user display and inquiry. The real time temperature measurement system can be apply for many parts of industry and living.

• 대한의용생체공학회:의공학회지
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• 제29권4호
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• pp.295-301
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• 2008

A wireless 3 channel ECG monitoring system was developed so that it could monitor the health and movement state during subject's daily life. The developed system consists of a wireless biomedical signal acquisition device, a personal healthcare server, and a remote medical server. Three experiments were performed to evaluate the accuracy, reliability and operability, applicability during daily life of the developed device. First, ECG signals were measured using the developed device and commercial reference device during sitting and marking time and compared to verify the accuracy of R-R intervals. Second, the reliable data transmission to remote server was verified on two types of simulated emergency event using patient simulator. Third, during five types of motion in daily life, the accuracy of data transmission to remote server using CDMA network was verified on two types of event occurring. By acquiring and comparing subject's biomedical signal and motion signal, the accuracy, reliability and operability, applicability during daily life of the developed device were verified. In addition, PDA-phone based wireless system enabled subject to be monitored without any constraints. Therefore, the developed system is expected to be applicable for monitoring the aged and chronic diseased people and giving first-aid in emergency.

• 정보보호학회논문지
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• 제26권6호
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• pp.1561-1569
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• 2016

IoT환경에서 센서 디바이스의 사용이 증가함에 따라 보안에 대한 필요성도 중요해지고 있다. 센서 디바이스가 IEEE 802.15.4 기반 LoWPAN에 배치되는 경우 필수적으로 PAN Coordinator와의 가입 과정이 수행되고 후속적으로 디바이스 간 바인딩 과정이 진행된다. 가입 및 바인딩 과정에서는 사전 분배된 네트워크 키 또는 인증서를 이용해 디바이스의 인증 및 키 분배를 한다. 하지만, 기존 방식에서 사용하는 네트워크 키는 그룹인증에 한정된 역할을 하며 인증서의 발급에서도 개별식별이 이루어지지 않는 문제점이 있다. 본 논문에서는 사전 분배된 네트워크 키의 문제점을 보완한 LoWPAN 환경에서 디바이스의 안전한 가입 및 바인딩 프로토콜을 제안한다.

• 한국컴퓨터산업학회논문지
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• 제6권2호
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• pp.345-354
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• 2005

그리드 사용자에게 시간과 장소에 상관없이 그리드 서비스를 이용할 수 있게 해주는 기술이 모바일 그리드이다. 이동환경에서 그리드 서비스를 제공하기 위해서는 단말기 배터리의 성능 및 이동성의 고려 등 여러 가지 제약사항이 따르며, 유선망에서의 그리드 기술을 이동 환경에 적용하기에는 많은 어려움이 있다. 따라서 본 논문에서는 모바일 그리드 서비스를 제공하기 위한 모바일 그리드 구조를 Ad-hoc 네트워크를 이용하여 설계를 하였으며, NS-2(Network Simulator)를 이용한 시뮬레이션을 통한 세 가지 방법의 라우팅 프로토콜의 지연시간에 대한 측정 및 이동 단말기 배터리의 성능을 고려한 비교를 통해, hybrid 방식의 라우팅 프로토콜이 효율적임을 제시하였다. 향후 모바일 그리드 서비스를 제공하기 위한 자원 할당 및 신뢰성 확보 방안에 대한 연구를 수행할 예정이다.

• 한국정보통신학회논문지
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• 제10권6호
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• pp.1065-1069
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• 2006

홈 네트워크 환경에서 디바이스는 동적으로 네트워크에 연결되고, IP 주소를 얻고, 자신의 기능을 알리고, 다른 디바이스의 존재 및 기능을 파악할 수 있다. 이런 과정 이후 디바이스는 서로 직접 통신을 할 수 있다. 본 논문에서는 디바이스들 사이에 대칭키를 이용하여 상호인증을 수행하는 디바이스의 안전한 검색방법을 제안하고자 한다. 이 방법은 홈서버를 사용하여 홈 네트워크 디바이스들에게 대칭키를 분배한다. 이 키를 사용하여 홈 디바이스들 사이의 상호인증이 수행되어 진다. 이 것은 미들웨어의 제어하에 두 디바이스가 안전하게 통신할 수 있는 기능을 제공한다.

• 한국전자통신학회논문지
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• 제9권12호
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• pp.1405-1414
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• 2014

사무실 관리 서비스 플랫폼은 사무실 센서 장치, G/DSCL(Gateway/Device Service Capability Layer), NSCL(Network Service Capability Layer), NA(Network Application)로 구성된다. 본 논문에서는 사무실 관리 서비스에 적합한 게이트웨이 리소스트리와 서비스 시나리오를 설계하고, 지능형 기능 모델링을 통해서 사무실 관리 서비스가 운영 될 수 있음을 보인다.