• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.2
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• pp.119-129
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• 2011

TCP-related Flooding attacks still dominate Distributed Denial of Service Attack. It is a great challenge to accurately detect the TCP flood attack in hish speed network. In this paper, we propose the NIC_Cookie logic implementation, which is a kind of security offload engine against TCP-related DDoS attacks, on network interface card. NIC_Cookie has robustness against DDoS attack itself and it is independent on server OS and external network configuration. It supports not IP-based response method but packet-level response, therefore it can handle attacks of NAT-based user group. We evaluate that the latency time of NIC_Cookie logics is $7{\times}10^{-6}$ seconds and we show 2Gbps wire-speed performance through a benchmark test.

• Journal of Internet of Things and Convergence
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• v.6 no.4
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• pp.81-87
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• 2020

This paper creates a standard node for acquiring sensor data from various industrial sensors (IoT/non-IoT) for the establishment of Smart Factory Digital Twin, and provides inter-compatible data by linking zones by group/process to secure data stability and to ensure the digital twin (Digital Twin) of Smart Factory. The process of the Zone Master platform contains interface specifications to define sensor objects and how sensor interactions between independent systems are performed and carries out individual policies for unique data exchange rules. The interface for execution control of the Zone Master Platform processor provides system management, declaration management for public-subscribe, object management for registering and communicating status information of sensor objects, ownership management for property ownership sharing, time management for data synchronization, and data distribution management for Route information on data exchange.

• The Journal of the Convergence on Culture Technology
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• v.9 no.1
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• pp.655-661
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• 2023

Big data, an important element of the 4th industrial revolution, is actively opening public data in public institutions and local governments. In the public data portal, everyone can conveniently search for data and check related data, but only those in ICT-related fields are using public data. Although data held by public institutions is open to citizens, it is difficult for anyone to easily utilize public data to develop applications. In this paper, data provided in open API format from public data portals has XML and JSON formats. In this study, we are a method of modularizing public data in XML format into a part that can be easily developed by linking it to a GUI interface. Based on the necessary public data, we propose a way to easily develop mobile programs and promote the use of public data.

• Journal of Astronomy and Space Sciences
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• v.20 no.4
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• pp.339-350
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• 2003

Engineering qualification model payload for a communications and broadcasting satellite(CBS) was developed by ETRI from May, 2000 to April, 2003. For. the purpose of functional test and verification of the payload, a real-time hardware-in-the-loop(HITL) CBS simulator(CBSSIM) was also developed. We assumed that the spacecraft platform for the CBSSIM is a geostationary communication satellite using momentum bias three-axis stabilization control technique based on Koreasat. The payload hardware is combined with CBSSIM via Power, Command and Telemetry System(PCTS) of Electrical Ground Support Equipment(EGSE). CBSSIM is connected with PCTS by TCP/IP and the payload is combined with PCTS by MIL-STD-1553B protocol and DC harness. This simulator runs under the PC-based simulation environment with Windows 2000 operating system. The satellite commands from the operators are transferred to the payload or bus subsystem models through the real-time process block in the simulator. Design requirements of the CBSSIM are to operate in real-time and generate telemetry. CBSSIM provides various graphic monitoring interfaces and control functions and supports both pre-launch and after-launch of a communication satellite system. In this paper, the HITL simulator system including CBSSIM, communications payload and PCTS as the medium of interface between CBSSIM and communications payload will be described in aspects of the system architecture, spacecraft models, and simulator operation environment.

• Korean Journal of Construction Engineering and Management
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• v.9 no.1
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• pp.66-76
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• 2008

Plant project is a complex project that consists of civil engineering, building, mechanical and electronic works. The schedule management is one of important factors in plant project because the construction duration of the project is very short comparing with the other construction projects. Specially, 4D CAD system needs to visualize construction schedule information in those complex projects. This study suggests methodologies for improving 4D CAD functions by considering those project characteristics. To develop a plant 4D CAD system, this study includes to develop new functions by analyzing actual schedule information from the plant construction sites.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.1137-1142
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• 2006

3D 가상공간을 협업에 효과적으로 이용하기 위해서는 3D 가상공간에서 빠르고 쉽게 의사를 표현할 수 있는 기술이 필요하다. 본 연구에서는 이런 효과적인 의사표현 방법으로 Sketch 기법을 제안한다. Sketch 기법은 간단한 2D 선들의 표현을 통해 매우 빠르게 아이디어를 표현 할 수 있으며, 의도에 따라 부분을 강조하거나 가감할 수 있기 때문에 좀 더 직관적으로 의도를 전달 할 수 있다. 그래서 이러한 Sketch 를 공간상에서 손쉽게 3D 모델의 표면이나 공간 위에 입력하고, 입력한 Sketch 를 3D 가상공간과 연동하여 보여 줌으로써 쉽게 3D 가상공간 안에 Sketch 로 의견을 표현 할 수 있게 하는 Sketch 기반 인터페이스를 연구 하였다. Sketch 기법을 3D 가상공간에 적용하기 위해서는 3D 가상공간 상에서 2D Sketch 를 입력하기 위한 방법과 입력 시 발생할 수 있는 위상차의 문제를 해결해야 한다. 이 연구에서는 2D Sketch 입력을 대상 3D 객체 중심에서 Sketch할 부분의 Sketch plain 을 선택 및 생성함으로써 입력하는 방법을 연구하였으며, 입력 시 발생하는 위상차는 View-point 및 View-Plain 의 이동 등을 통해 해결점을 찾고자 하였다. 그리고 추후 연구를 통해 Sketch 를 Annotation 으로 활용, 협업에서 필요로 하는 Sketch Annotation 으로 개발하고자 한다.

• Journal of Cadastre & Land InformatiX
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• v.44 no.1
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• pp.113-125
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• 2014

According to the public open data policy, the government established the demanders-oriented and customized open data plan and allowed people to use plenty of public data free. There are, however, few geospatial information systems to maximize its usability. For the purpose to make the effective geospatial information services, this study examined how data was linked between the public data portal and open platform first. And then this proposed the interface server model to support the data link between these systems technically.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.779-784
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• 2008

가상현실 시스템에서 체험자가 현실과 같은 몰입을 느끼기 위해서는 하드웨어를 통한 가상환경 구축과 체험자와의 상호작용이 중요하다. 본 논문에서는 위치 추적 시스템(Motion Tracking System), Wand(3D Mouse) 및 HoloPoint 등 다양한 VR 인터페이스를 통해 체험자의 움직임, 위치, 동작을 인식하고 대형 멀티 디스플레이 시스템을 통해 입체영상을 제공하는 가상환경을 구축하고 체험자가 원하는 정보를 상호작용(Interaction)으로 제공할 수 있는 가상 캠퍼스 안내 시스템을 구현하고자 한다. 가상 캠퍼스 구축은 캠퍼스의 지형, 건물 및 구조물들의 정확한 형상을 얻기 위해 3D 스캐너를 이용하였고 획득된 데이터는 일련의 과정들을 거쳐 3D 모델로 생성된다. 이렇게 생성된 모델을 재배치 및 최적화하기 위해 모델링 소프트웨어를 사용하였다. 구축된 가상 캠퍼스와 위치 추적 시스템 및 Wand의 연동을 위해 VR 프로그래밍 하여 체험자의 움직임 및 동작을 콘텐츠에 그대로 적용시켰다. 여기에 키오스크 유형의 HoloPoint를 이용하여 체험자의 손동작으로 상호작용하는 안내시스템도 구축하였다. 상호작용 가능한 가상캠퍼스 안내 시스템은 가상현실 시스템 구축에 대한 또 다른 방법과 활용 예를 제시함으로써 가상전시관 및 가상체험관 등에 활용될 수 있을 것으로 기대된다.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.12
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• pp.1933-1940
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• 2013

Recently, due to improvement of computer performance and development of information devices, technology of mobile augmented reality is proliferating rapidly. However, because most of contents are passive or limitary, user can not feel interest and immersion. This paper designs interaction user interface system of 2 dimensional drawing based on mobile augmented reality to make bi-directional communication between the real world and the virtual world possible by using the vision based augmented reality and the database system.

• Journal of Digital Contents Society
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• v.11 no.3
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• pp.385-392
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• 2010

At present, educational serious games which are designed for educational purpose including funny element have been developed in korea. This paper proposes a history educational game and describes how to make history educational game using OGRE engine. The OGRE engine is public, and widely used in many universities. Methods of the proposed game's development include development environment, desired plan, game scenario, game interface, method to cooperate with physics engine and so on. The proposed game is played in performing a mission that is based on historical event of our country in itself. And discrimination of the proposed game is to set a quest with actual historical events, in order to learn history beyond the simple fun in the existing history educational games. This paper should be helpful to discrimination of history educational serious game and developers to create history educational serious game with OGRE engine.