• 한국산학기술학회논문지
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• 제11권8호
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• pp.3005-3011
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• 2010

최근 고성능의 스마트 폰이 속속 등장하면서 스마트 폰의 보안 문제가 대두되고 있다. 특히 오픈 플랫폼의 경우엔 더욱 바이러스의 타겟이 되기 쉬워졌다. 또한, 시만텍, 안철수연구소 등 많은 보안솔루션 업체들이 모바일 보안 시스템을 개발하고 있지만, 아직 Android 관련 보안 프로그램은 상용화된 제품이 없는 실정이다. 이러한 문제를 사전에 해결하기 위해 오픈 플랫폼 중의 하나인 Android 상에 일반 Linux에서 동작하는 SELinux를 사용할 수 있도록 환경을 구축하여 Android 시스템의 보안 기능을 개발하였으며, S3C6410 상에서 사용자 어플리케이션을 검증하였다.

• 한국항해항만학회지
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• 제34권4호
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• pp.281-286
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• 2010

A new concept of ocean transport system, called mobile harbor, was introduced as a feasibility study in Korea in 2009. Target of the mobile harbor is a short distance transport of containers with or without cargo handling cranes. Although the mobile harbor project has a lot of topics to deal with, this paper is to focus on only ship-to-ship stabilized mooring, which plays a key role in cargo handling. The ship-to-ship stabilized mooring system was developed and installed on board a barge of LOA 32m and breadth 12m. The dockside tests as sea test were carried out so as to ascertain whether the systems can work well to control the barge’s motion. The results of dockside test showed that the heave motion of the barge's motion can be reduced by more than 45%.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.3016-3018
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• 2005

The PSD(Position Sensitive Detector) is a sensor for detecting the position of incident light. Because of its various advantages, it is used for position and angle sensing, optical range finders, laser displacement sensing, and etc. In the previous study of the position finding system, the laser tracking robot is developed. Small data rate and unidirectionality is the characteristics of data communication both DSP-based pan/tilt control board and the robot. If we can transmit data to the target using PSD sensor and laser diode module, there is no need for communication devices such as the bluetooth and wireless module. For this reason, this paper presents the new method for data transmission. Transmit data using RS-232 is modulated by a VTF(Voltage To Frequency) converter The laser diode module transmits the modulated data. And then the PSD sensor receive that data. Demodulation process is accomplished by the system which is consisted with trans-impedance amplifier, FTV(Frequency To Voltage) converter, and etc.

• 제어로봇시스템학회논문지
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• 제14권11호
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• pp.1117-1123
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• 2008

This paper implements dual-kernel system using standard Linux and real-time embedded Linux for the real-time control of intelligent robot systems. Such system provides more useful services including standard Linux thread that is easy to implement complicated tasks and real-time tasks for the deterministic response to velocity control. Here, an open source real-time embedded Linux, XENOMAI, is ported on embedded target board. And for interfacing with motor controller we adopted a real-time serial device driver. The real-time task was implemented with a priority to keep the cyclic control command for trajectory control. In order to validate deterministic response of the proposed system, the performance measurement of the delay in performing trajectory control with feedback loop is evaluated with non real-time standard Linux. The proposed software architecture is anticipated to take advantage of features in both standard Linux and real-time operating systems for the intelligent robot systems.

• 대한전자공학회논문지SD
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• 제44권1호
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• pp.84-89
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• 2007

차세대통신의 고속 모뎀을 위한 SoC(System on a chip)를 설계하고 테스트하기 위해서는 고속 전송 구조를 가지는 플랫폼의 사용이 필수적이다. 즉 500Mbps 대용량 데이터를 고속으로 실시간 시험할 수 있는 전송 플랫폼이 필요하다. 본 논문은 가상모뎀 SoC 의 고속 전송 구조를 실시간으로 검증하기 위하여 고대역폭의 데이터 전송을 처리할 수 있는 SoC 타겟 보드와 PC를 PCI로 연결하고 AHB-PCI 브릿지 IP를 통하는 인터페이스 구조를 제시한다. 기존의 가상 모뎀 SoC 타겟보드에서 ARM 프로세서와 SDRAM 방식의 통신 구조보다도 개선된 DPRAM방식의 통신 구조를 사용하여 두 매체간의 업로드 및 다운로드 속도가 250Mbps의 고속통신이 가능한 것을 증명하였다.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.136-137
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• 2002

We have been researching upgrade version of a stereotactic whole body frame, used for evaluating daily setup accuracy of the patient positioning during fractionated extra-cranial stereotactic radiotherapy. Currently, we are focusing on the development of a new stereotactic whole body frame, and then will handle organ movement produced by breathing at the next stage. MeV-Green is chosen for the best immobilizer possible and the epoxy board is for the frame with the dimension of 110 em in length, 50 cm in width in order to maximize transmission rate of the beam from lateral or posterior direction and to fit CT and PET scanners with an aperture of 55 cm at least. The key point of an upgraded stereotactic whole body frame will be set on the collision-free rotation of the gantry with the frame, and the development of the checking structure for the daily patient repositioning regarding internal target.

• 전기전자학회논문지
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• 제24권2호
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• pp.497-501
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• 2020

안개가 낀 악조건의 날씨에서도 자율주행 및 지능형 CCTV가 정상적으로 동작하기 위해 안개 제거 기술이 필수적이다. 안개 제거 기술에서도 특히 대기강도 추정 방법이 중요하다. 본 논문에서는 불필요한 연산량을 줄이고 여러 가지 입력 영상에서도 효과적으로 대기강도를 추정할 수 있는 패치 기반 대기강도 추정 알고리즘과 하드웨어 구조를 제안한다. 알고리즘은 대중적으로 널리 사용되는 쿼드트리 방식과 비교했으며, 하드웨어 설계는 국제 표준 4K 영상에 실시간 대응할 수 있는 구조로써 XILINX사의 xc7z045-ffg900 목표 보드를 사용하여 FPGA 검증을 했다.

• 기술경영경제학회:학술대회논문집
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• 기술경영경제학회 2003년도 제23회 하계학술발표회 논문집
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• pp.108-115
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• 2003

Government R&D Project Management in Korea has had considerable difficulties because of the lack of project monitoring systems and insufficient communication. The National Program for Tera-level Nanodevices (TND Program) is a ten-year R&D program for commercialization in the area of nano technology. Collaboration and communication among the various participants such as business companies, universities, and government R&D institutes are key success factors in this R&D program. TND Program office has developed a Web-based project management system. This system consists of mostly four sub-management functions: (1) Milestones management of all R&D projects; (2) DR (Design Review) management as the mechanism for checking the performance against milestones; (3) Project activity management using the WBS (Work Breakdown Structure); (4) Budget management. Additionally, it also has many R&D supporting functions such as technology information bulletin board, community management, and visual summary of project progress and performance. This system is effective for monitoring research project as well as measuring project performance of the overall research program. This Web-based system has become the useful tool of R&D moving target mechanism and effective communication and collaboration tool. System features and adoption process of the system are also suggested.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.175-176
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• 2008

향후 개발되어질 Digital Power IED (Protection & Measuring, Control, Supervision etc.) 에서 제작된 H/W 및 Simulation용 Target Board 의 Firmware Process Flow 지침으로서 개발 경험을 바탕으로 보다 안정적이고 효율적인 Programming 을 가능하게 하고, 실시간 연산 Process 의 기준 확립 및 이해를 통한, 개선 아이디어 도출 및 수정 필요시 빠른 Trouble-Shooting 능력을 배양할 수 있다. 새로운 Process 아이디어의 Simulation 적용 및 확인으로 호환성과 안정성에 기반하는 F/W Optimization을 항상 유지 관리할 수 있으며, Measuring Element (전압, 전류, 전력, 주파수 등), Protection Element (OC, OCG, OV, OVG, UV, UC, DOC 등) 의 기준을 정함으로서 새로운 개발자에게는 개발 실무를 위한 교육 자료로 이용하고, 기존 개발자들에게는 안정된 F/W 모듈을 제공한다. 본 논문에서는 개발 시간을 단축하고, 다양한 진보 Process 접근을 원활히 할 수 있는 F/W 및 S/W 시뮬레이터를 제시한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.180-180
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• 2000

The shape of cold strip for the stainless process has been become issue in quality recently, and hence POSCO (Pohang Iron & Steel Co., Ltd) developed an automatic control system for strip shape in the sendzimir mill. The strip shape is measured by an outward measuring roll and is controlled by As_U roll and first intermediate roll. As_U roll consists of 8 saddles, which are controlled vertically. The fist intermediate rolls, which are controlled horizontally, consist of two pairs of rolls up and down. A developed shape control system is applied to real plant by using fuzzy logic and neural network method to control actuators; As_U roll and first intermediate roll. This system composes mainly of three parts as a real-time system, input to output conditioner board, and man-machine interface. The actual shape is recognized by neural network and converted into symmetric shape. The fuzzy controller, based on the shape from neural network and sensor, controls positions of the As_U roll and first intermediate roll. This paper verifies the shape controller performance. The experiments are made on line for the sendzimir mill. The shape control performance shows very efficient for the target tracking, shape symmetry, and fluctuation of shape.