• Journal of Information Display
• /
• 제8권4호
• /
• pp.27-31
• /
• 2007

In this paper, we present an efficient tiled stereo display system for tangible meeting. For tangible meeting, it is important to provide immersive display with high resolution image to cover up the field of view and provide to the local user the same environment as that of remote site. To achieve these, a high resolution image needs to be transmitted for reconstruction of remote world, and it should be displayed using a tiled display. However, it is hard to transmit high resolution image in real time due to the limit of network bandwidth, and so we receive multiple images and reconstruct a remote world with received images in advance. Then, we update only a specific area where remote user exists by receiving low resolution image in realtime. We synthesize the transmitted image to the existing environmental map of remote world and display it as a stereo image. For this, we developed a new system which supports GPU based real time warping and blending, automatic feature extraction using machine vision technique.

• International Journal of Advanced Culture Technology
• /
• 제4권3호
• /
• pp.13-19
• /
• 2016

The growth of mobile devices in Internet of Things (IoT) leads to a number of remote and controlling system related IoT applications. For instance, home automation controlling system uses client system such web apps on smartphone or web service to access the home server by sending control commands. The home server receives the command, then controls for instance the light system. The web service gateway responsible for handling clients' requests attests an internet latency when an increasing number of end users requests submit toward it. Therefore, this web service gateway fails to detect several commands, slows down predefined actions which should be performed without human intervention. In this paper, we investigate the performance of a web server-side platgorm based event-driven, non-blocking approach called Node.js against traditional thread-based server side approach to handle a large number of client requests simultaneously for remote and controlling system in IoT remote monitoring applications. The Node.JS is 40% faster than the traditional web server side features thread-based approach. The use of Node.js server-side handles a large number of clients' requests, then therefore, reduces delay in performing predefined actions automatically in IoT environment.

• 로봇학회논문지
• /
• 제12권4호
• /
• pp.395-401
• /
• 2017

In this paper, we introduce a robot-assisted medical diagnostic system that enables remote ultrasound (US) imaging to be applied to the conventional telemedicine, which has been possible only with interviewing or a visual exam. In particular, a master-slave robot system is developed that ultrasonic diagnosis specialist can control the position and orientation of US probe in the remote place. The slave robot is designed to be compact, lightweight, and hand-held so that it can easily transfer to the remote healthcare center. Moreover, 6-degree-of-freedom (DOF) probe motion is possible by the robot design based on Stewart platform. The master device is also based on a similar structure of the slave robot. To connect master and slave system in the wide area network (WAN) environment, a hardware CODEC was developed. In this paper, we introduce the detail of each component and the results of the recent experiments conducted in the remote sites by the developed robotic ultrasound imaging system.

• 디지털콘텐츠학회 논문지
• /
• 제10권1호
• /
• pp.97-105
• /
• 2009

멀티미디어를 이용한 원격 교육이 효과적으로 이루어지기 위해서는 동영상 정보의 효율적인 관리 기법이 개발되어야 한다. 이 때, 동영상의 실시간 처리를 위해서 동영상을 압축된 상태로 관리하고 검색할 수 있어야 한다. 현재 압축 동영상은 주로 MPEG-2를 이용한다. 따라서 멀티미디어를 이용한 원격 교육에서 동영상을 실시간으로 처리할 수 있도록 하기 위해서는 MPEG-2로 압축된 동영상 정보를 관리하고 검색하는 기법의 개발이 매우 중요하다. 본 논문에서는 원격 교육에서 가장 어려운 정보 관리 기술인 동영상 정보의 관리 기술에 대한 연구로 실시간 원격 교육에 사용할 수 있도록 MPEG-2 동영상 정보 관리 시스템 및 검색 기술을 개발하였다.

• 항공우주기술
• /
• 제12권1호
• /
• pp.120-127
• /
• 2013

최근, 항공우주 분야에서 오픈 소스 소프트웨어에 대한 관심이 늘고 있다. 대표적인 사례로 우주환경을 3D로 가시화하는 소프트웨어인 셀레스티아가 있다. 셀레스티아는 오픈소스 소프트웨어로서 여러 장점이 있다. 첫째 사용하기 쉽고, 둘째 스크립트 언어를 지원하여 필요한 기능을 쉽게 추가할 수 있다. 이런 특징으로, 다른 시스템과의 연계도 용이하다. 그러나, 셀레스타아를 동일 시스템이 아닌 원격시스템에서 제어하는 기능은 부족하다. 본 논문은 위성 시뮬레이션 도구인 GenSim에서 UDP 통신을 이용하여 원격으로 명령을 전송하는 모듈의 설계 및 구현 과정에 대해 기술하고, 개발시 겪었던 문제와 이에 대한 해결방법을 기술한다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제15권11호
• /
• pp.4163-4183
• /
• 2021

As measures for protecting users and ensuring security of electronic financial transactions, such as online banking, financial institutions in South Korea have implemented network segregation policies. However, a revision of such domain-centered standardized network segregation policies has been increasingly requested because of: 1) increased demand for remote work due to changes resulting from COVID-19 pandemic; and 2) the difficulty of applying new technologies of fintech companies based on information and communications technologies (ICTs) such as cloud services. Therefore, in this study, problems of the remote work environment arising from the network segregation policy currently applied to the financial sector in South Korea and those from the application of new ICTs such as fintech technology have been investigated. In addition, internal network protection policies of foreign financial sectors, such as those of the United States, United Kingdom, European Union, and Russia, and internal network protection policies of non-financial sectors, such as control systems, have been analyzed. As measures for the effective improvement of the current network segregation policy, we propose a policy change from domain-based to data-centric network segregation. Furthermore, to resolve threats of hacking at remote work, recently emerging as a global problem due to COVID-19 pandemic, a standard model for remote work system development applicable to financial companies and a reinforced terminal security model are presented, and an alternative control method applicable when network segregation is not applied is proposed.

• 한국환경생태학회:학술대회논문집
• /
• 한국환경생태학회 2010년 학술대회 논문집
• /
• pp.45-48
• /
• 2010

• 한국정보시스템학회:학술대회논문집
• /
• 한국정보시스템학회 1997년도 추계학술대회논문집 기업경쟁력 향상을 위한 정보통신 기술의 활용
• /
• pp.113-125
• /
• 1997

The objective of this research is to construct and build a software platform to enable collaboration among enterprise headquarters, product designers, software engineers, manufacturing plants, and suppliers which are located at different remote locations via internet. In specific, agent technology is adopted as a software vehicle to automate demand as a software vehicle to automate demand and supply process in the internet environment. Agents are programs that act an behalf of their human users to perform laborious tasks such as information locating, accessing, filtering, integrating, adapting and resolving inconsistencies. Global competition is forcing the present day industry to produce high quality product more fast and inexpensively. In Korea, most labor-intensive industries have moved to China and other Asian countries for cost reduction. The need for fast information exchange has increased among the remote locations for the cooperation and coordination. In this research, a virtual global manufacturing system will be constructed that distributes production schedule among remote places, acts as a bridge between the headquarters and manufacturing plants, distributes tasks and collates different solutions between demand and supply using agent. The external communication protocol takes HTML format, internal message handling requires SGML for document exchange, and KQML for agent implementation. The expected benefits will be : reduced cost of real-time information exchange, realization of global manufacturing environment, the maximum utilization of internet for the enterprise data exchange.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 2004년도 추계학술대회 논문집
• /
• pp.292-297
• /
• 2004

The conventional computerized numerical controller (CNC) of machine tools has been increasingly replaced by a PC-based open architecture CNC (OAC) which is independent of the CNC vendor. The OAC and machine tools with OAC led the convenient environment where it is possible to implement user-defined application programs efficiently within CNC. Tis paper proposes a method of operational fault cause diagnosis which is based on the status of programmable logic controller (PLC) in machine tools with OAC. The operational fault is defined as a disability state occurring during normal operation of machine tools. The faults are occupied by over 70% of all faults and are also unpredictable as most of them occur without any warning. Two diagnosis models, the switching function (SF) and the step switching function (SSF), are propose in order to diagnose the fault cause quickly and exactly. The cause of an occurring fault is logically diagnosed through a fault diagnosis system (FDS) using the diagnosis models. A suitable interface environment between CNC and develope application modules is constructed in order to implement the diagnostic functions in the CNC domain. The diagnosed results were displayed on a CNC monitor for machine operators and provided to a remote site through a web browser. The result of his research could be a model of the fault cause diagnosis and the remote monitoring for machine tools with OAC.

• 사물인터넷융복합논문지
• /
• 제2권1호
• /
• pp.1-6
• /
• 2016

사물인터넷은 네트워크에 연결된 사람, 사물, 공간 등 모든 것들(Things)이 실시간으로 데이터를 생성하고 해당 객체간의 정보가 수집, 공유, 활용되는 기술이나 환경을 일컫는다. 현재 헬스케어, 스마트홈 등 다양한 분야에서 연구가 진행이며 사물인터넷 환경에 지리적 공간과 인터넷 간의 연결성을 강조한 만물인터넷의 개념도 등장했다. 사람, 사물 등 각 객체간의 연결성이 중요하게 부각되면서 효율적이고 안전한 인증기술에 대한 연구가 진행 중이다. 이 논문에서는 사물인터넷 환경에서 사람, 사물 등 객체간의 상호인증을 위한 개선된 RADIUS(Remote Authentication Dial In User Service) 프로토콜을 제안한다.