• 디지털산업정보학회논문지
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• 제5권2호
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• pp.51-76
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• 2009

In this paper, a new hybrid opto-digital multiple information hiding and real-time extracting system was suggested and implemented using a volume holographic optical correlator. The multiple information hiding system in which the multiple information can be hided in an arbitrary cover image was digitally implemented by using the combination of pseudo random sequence and Hadamard matrix. In addition, a real-time optical extraction system in which the hided multiple information in a cover image can be extracted in real-time was implemented by using a volume holographic optical correlator. In the VanderLugt-type holographic optical correlator used in this experiment, the multiful matched spatial filters corresponding each of the hided informations were recorded in a photorefractive crystal by using the moving window-based angular multiplexing scheme.

• 전기학회논문지P
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• 제64권4호
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• pp.267-272
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• 2015

Active noise control (ANC) is a method of cancelling a noise signal in an acoustic cavity by generating an appropriate anti-noise signal via canceling loudspeakers. The continuous progress of ANC involves the development of improved adaptive signal processing algorithms, transducers, and DSP hardware. In this paper, the convergence behavior and the stability of the FxLMS algorithm in ANC systems with real-time implementation is proposed. Specially, The advanced DSP H/W with dual core(DSP+ARM) and API(application programming interface) S/W programming was developed to improve the real-time implementation performance under the FxLMS algorithms of input noise such as road noise environment. The experimental results are found to be in good agreement with the theoretical predictions.

• 한국정보통신학회논문지
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• 제7권4호
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• pp.779-787
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• 2003

최근에는 웹(Web)을 기반으로 하여 여러 분야에 적용되는 원격 감시, 자동화 제어 시스템 등의 개발에 관한 연구가 활발히 전개되고 있다. 본 논문에서는 기존의 자동화 시스템에 원격 제어 기술을 추가하였다. 오류의 수정과 적용이 쉬운 LabView 그래픽컬 언어를 사용하여 멀티미디어 데이터 처리, 일반적인 통신망(TCP/IP)상의 확장성을 고려한 실시간 모니터링 및 원격 제어를 위한 방법을 제안하고, 온실 환경 제어 시스템에 적용하였다. 적용 결과는 온실의 제어 상황을 원격으로 제어 및 감시하는데 매우 효율적인 것으로 평가되었다.

• Journal of Information Processing Systems
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• 제13권2호
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• pp.348-359
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• 2017

Nowadays most vehicles are equipped with a variety of electronic devices to improve user convenience as well as its performance itself. In order to efficiently interconnect these devices with each other, Controller Area Network (CAN) is commonly used. However, the CAN requires reconfiguration of the entire network when a new device, which is capable of supporting both of transmission and reception of data, is added to the existing network. In addition, since CAN is based on the collision avoidance using address priority, it is difficult that a new node is assigned high priority and eventually it results in transmission delay of the entire network. Therefore, in this paper we propose a new system component, called CAN coordinator, and design a new CAN framework capable of supporting plug and play functionality. Through experiments, we also prove that the proposed framework can improve real-time ability based on plug and play functionality.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2001년도 추계학술발표논문집 (하)
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• pp.895-898
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• 2001

이기종 보안제품을 통합관리하기위한 통합보안관리시스템은 보안관리를 위한 불필요한 중복을 피하고 제품들을 효율적으로 상호운용하기위해 제안된 보안관리 구조이다. 본 논문은 다양한 보안제품으로 구성된 보호대상 네트워크의 보호 상황을 모니터링하고, 보안제품들이 상호 유동적으로 결합하여 작동할 수 있는 통합보안관리시스템을 위한 웹 기반 인터페이스 구조를 소개한다. 보안제품들에 대한 통합보안관리를 인터넷상에서 이미 친숙한 웹 기반 관리 기술을 이용함으로써 보안관리자들에게 편의성과 일관성을 제공하였으며, 보안정책에 대한 지식이 부족한 일반 사용자도 쉽게 보안관리를 수행할 수 있도록 설계되었다. 또한, 자바 애플릿을 이용하여 구현된 보안관리 인터페이스는 통합보안관리를 위해 요구되는 정보들을 동적으로 원격지의 보안관리자에게 제공함으로써 보안관리의 공간적 제약을 제거하였다.

• Journal of Multimedia Information System
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• 제5권1호
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• pp.1-8
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• 2018

The coordinate system conversion of weather radar data is a basic and important process because it can be a factor to measure the accuracy of radar precipitation rate by comparison with the ground rain gauge. We proposed a real-time coordinate system conversion method that combines the advantages of the interpolation masks of SPRINT and REORDER to use tables of predetermined radar samples for each interpolated object coordinate and also distance weights for each precomputed sample. Experimental results show that the proposed method improves the computation speed more than 20~30 times compared with the conventional method and shows that the deterioration of image quality is hardly ignored.

• 한국주조공학회지
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• 제30권1호
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• pp.5-13
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• 2010

This article aims to introduce the synchrotron radiation for its utilization in the casting and solidification fields as an unique tool for observation of real time phenomena of molten metal during solidification. General features of the synchrotron radiation were briefly introduced for readers in the casting and solidification fields, with no background regarding to synchrotron radiation. And basic principles of imaging technologies using synchrotron light for in-situ observation of molten metal were explained together with exemplary research works, which were reported on the casting and solidification fields in recent years. As a practical guide, real time observation of Al-Si casting alloy was introduced with experimental facilities, image acquisition, and processing together with representative results.

• 천문학논총
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• 제8권1호
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• pp.67-82
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• 1993

We developed a real-time CCD photometric program for IBM PC compatibles. This program can perform several functions necessary for CCD photometry such as telescope control. filter rotation, CCD camera control and data acquisition, two-dimensional image processing, simple aperture photometry and automatic differential photometry. The image processing of a spiral galaxy M51 observed with the SNU 61cm reflector shows a well developed spiral structure. Simple aperture photometric results of 14 stars in open cluster NGC 6871 almost accorded with those from IRAF/APPHOT. And we could confirm the light variation of eclipsing binary EM Cep by simultaneous automatic differential photometry of 7stars in NGC 7160. Due to the excellence in the precision and efficiency of automatic differential photometry using CCD. this program is very useful for the study of small amplitude ${\delta}$ Sct type variables and of the photometric stability of B ${\sim}$ F type stars.

• 한국멀티미디어학회논문지
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• 제20권4호
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• pp.606-613
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• 2017

When the planar area is captured by the depth camera, the shape of the plane in the captured image has perspective projection distortion according to the position of the camera. We can correct the distorted image by the depth information in the plane in the captured area. Previous depth information based perspective distortion correction methods fail to satisfy the real-time property due to a large amount of computation. In this paper, we propose the method of applying the conversion table selectively by measuring the motion of the plane and performing the correction process by parallel processing for correcting perspective projection distortion. By appling the proposed method, the system for correcting perspective projection distortion correct the distorted image, whose resolution is 640x480, as 22.52ms per frame, so the proposed system satisfies the real-time property.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2005년도 춘계학술발표대회
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• pp.1705-1708
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• 2005

Recently, flash memory is becoming popular as storage system to store and retrieve multimedia files. However, there are few researches about multimedia file system for flash memory based storage devices. We have been designing and developing a novel multimedia file systems for flash memory. In this paper, we describe the semantics of real-time retrieval of multimedia data and present scheduling scheme to guarantee the real-time requirements in our multimedia file system.