• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 추계학술발표논문집 (상)
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• pp.27-30
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• 2002

Recently, there are lots of concerning on the control of multi-agent control system and mixed reality integrating real and virtual environments. In this paper, an integrated agent control system based on mixed reality and mobile environment is proposed. The system consists of a manager, agents, a mapping module, a geographic information module, a WAP server, and a mobile manager. The manager has Hybrid Device Manager(HDM) working for revising images and position data of the agents to display that at the 3D virtual and mobile environments respectively. Especially, the images of the agent is translated to LBM format and displayed on the mobile phone, and the current position of the agent is displayed on the display screen, so that a user are able to control the agent when he is moving. Experimental results shows the proposed system lets us control the agents conveniently at a computer and a mobile phone.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 G
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• pp.3064-3066
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• 1999

The existing equipment with wire communication can expect the stability of data transmission. However, according to increasing a number of DTE (Data Terminal Equipment), wiring work becomes a heavy burden. Restriction to application about portable DTE and the lack of flexibility are another drawback of wire communication. This paper presents the design and implementation of a RF (Radio Frequency) based wireless communication system. The RF based module is designed to the multi communication between DTEs. The RF based module consists of RF circuit and microprocessor. The main properties of RF circuit are maximum 5Kbps transmission rate, maximum 90m transmission distance and 433MHz frequency band. The microprocessor rearrange the data into AHDLC(Advanced High level Data Link Control) format and then instructs RF circuits to transmit/receive the data. The RF module have a wide application field such as fire/security alarm, remote control/measurement etc..

• 지능정보연구
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• 제10권3호
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• pp.27-37
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• 2004

인터넷상에서 데이터를 표현하고 데이터를 서로 교환하기 위한 문서 표준으로 XML이 제시되고 있다. XML은 또한 웹상에 산재되어 있는 문서에 대한 쉬운 검색 및 재사용을 지원하는 문서 표준으로도 부각되고 있다. XML 콘텐츠 관리 시스템을 구현할 때 Semi-structured 데이터를 얼마나 효율적이고 효과적으로 검색 및 관리할 수 있는 가하는 점과 XML의 특징인 재사용성을 얼마나 지원해 줄 수 있는가를 고려해서 XML 데이터를 모델링 해야한다. 또한 모델링한 데이터를 어떻게 실질적으로 저장해야 할 것인 가도 고려해야 한다. 본 논문에서는 XML 문서의 데이터를 데이터 시스템에 저장하고 검색하기 위한 새로운 데이터 모델을 제안한다. 제안하는 데이터 모델은 XML 문서의 데이터 뷰와 구조 뷰를 모두 표현하며 XML 문서를 위한 새로운 데이터 시스템이나 기존의 관계형 시스템 모두를 고려한다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2006년도 춘계종합학술대회
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• pp.950-953
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• 2006

다음은 요약문 입이동 멀티미디어 통신에서의 주요한 요소기술 중의 하나는 높은 품질의 서비스를 제공할 수 있는 광대역 전송기술이다. 이와 같은 광대역 이동통신시스템을 위해서는 높은 주파수 효율과 낮은 전력소모를 가지면서 시변 다중경로 페이딩 채널에 의한 신호왜곡을 극복해야 한다. 따라서 단일 반송파의 짧은 버스트 데이터전송을 위한 적응적 결정귀환 등화방식이 하나의 해결책으로 고려되고 있다. 본 논문에서는 짧은 훈련심볼을 포함한 버스트 신호 갖는 시스템의 성능향상을 위하여 연판정 귀환을 갖는 MTLMS (multiple-training least mean square) 기반의 DFE(decision feedback equalizer)를 제안하고 시뮬레이션을 통하여 다른 등화방식과의 성능을 비교 분석하였다.

• Journal of Astronomy and Space Sciences
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• 제35권4호
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• pp.227-233
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• 2018

This study presents the generation and accuracy assessment of predicted orbital ephemeris based on satellite laser ranging (SLR) for geostationary Earth orbit (GEO) satellites. Two GEO satellites are considered: GEO-Korea Multi-Purpose Satellite (KOMPSAT)-2B (GK-2B) for simulational validation and Compass-G1 for real-world quality assessment. SLR-based orbit determination (OD) is proactively performed to generate orbital ephemeris. The length and the gap of the predicted orbital ephemeris were set by considering the consolidated prediction format (CPF). The resultant predicted ephemeris of GK-2B is directly compared with a pre-specified true orbit to show 17.461 m and 23.978 m, in 3D root-mean-square (RMS) position error and maximum position error for one day, respectively. The predicted ephemeris of Compass-G1 is overlapped with the Global Navigation Satellite System (GNSS) final orbit from the GeoForschungsZentrum (GFZ) analysis center (AC) to yield 36.760 m in 3D RMS position differences. It is also compared with the CPF orbit from the International Laser Ranging Service (ILRS) to present 109.888 m in 3D RMS position differences. These results imply that SLR-based orbital ephemeris can be an alternative candidate for improving the accuracy of commonly used radar-based orbital ephemeris for GEO satellites.

• Journal of Positioning, Navigation, and Timing
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• 제11권4호
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• pp.279-286
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• 2022

In this paper, we designed a software library that produces integrated Global Navigation Satellite System (GNSS) / Inertial Navigation System (INS) navigation information using the raw measurements provided by the GNSS chipset, gyroscope, accelerometer and magnetometer embedded in android smartphone. Loosely coupled integration method was used to derive information of GNSS /INS integrated navigation. An application built in the designed library was developed and installed on the android smartphone. And we conducted field experiments. GNSS navigation messages were collected in the Radio Technical Commission for Maritime Service (RTCM 3.0) format by the Network Transport of RTCM via Internet Protocol (NTRIP). As a result of experiments, it was confirmed that design requirements were satisfied by deriving navigation such as three-dimensional position and speed, course over ground (COG), speed over ground (SOG), heading and protection level (PL) using the designed library. In addition, the results of this experiment are expected to be applicable to maritime navigation applications using smart device.

• 한국BIM학회 논문집
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• 제9권4호
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• pp.31-40
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• 2019

With Building Information Modeling(BIM) becoming the de facto standard for data sharing in the AEC industry, additional needs have increased to ensure the data integrity of BIM models themselves. Although the Industry Foundation Classes provide an open and neutral data format, its generalized schema leaves it open to data loss and misclassifications This research applied deep learning to automatically classify BIM elements and thus check the integrity of BIM-to-IFC mappings. Multi-view CNN(MVCC) and PointNet, which are two deep learning models customized to learn and classify in 3 dimensional non-euclidean spaces, were used. The analysis was restricted to classifying subtypes of architectural walls. MVCNN resulted in the highest performance, with ACC and F1 score of 0.95 and 0.94. MVCNN unitizes images from multiple perspectives of an element, and was thus able to learn the nuanced differences of wall subtypes. PointNet, on the other hand, lost many of the detailed features as it uses a sample of the point clouds and perceived only the 'skeleton' of the given walls.

• International Journal of Computer Science & Network Security
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• 제22권7호
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• pp.103-108
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• 2022

Mass media in the digital age are not only one of the most important elements of the information society but also a strategic resource for its development. Effectively implemented communication makes it possible to build connections not only between individuals, but also between social institutions and representatives of various generational groups of the mass audience, as well as ensure information security in a crisis period. At the same time, in the context of a constantly increasing amount of information flows, more and more often "a person loses the ability to independently think, analyze, and critically perceive information." At the same time, "imposing" on the representatives of this or that society, through the content of multi-format mass media or active authors of social networks, a certain point of view on the problem becomes a completely realizable task. Thus, the main task of the study is to analyze the anti-crisis communications in legal discourse in terms of ensuring information security. As a result of the study, current trends and prerequisites of anti-crisis communications in legal discourse in terms of ensuring information security were revealed.

• International Journal of Computer Science & Network Security
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• 제24권4호
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• pp.147-154
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• 2024

The continuous increase in urban population due to migration of mases from rural areas to big cities has set urban water supply under serious stress. Urban water resources face scarcity of available water quantity, which ultimately effects the water supply. It is high time to address this challenging problem by taking appropriate measures for the improvement of water utility services linked with better understanding of demand side management (DSM), which leads to an effective state of water supply governance. We propose a dynamic framework for preventive DSM that results in optimization of water resource management. This paper uses Agent Based Modeling (ABM) with Digital Twin (DT) to model water consumption behavior of a population and consequently forecast water demand. DT creates a digital clone of the system using physical model, sensors, and data analytics to integrate multi-physical quantities. By doing so, the proposed model replicates the physical settings to perform the remote monitoring and controlling jobs on the digital format, whilst offering support in decision making to the relevant authorities.

• 한국멀티미디어학회논문지
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• 제6권1호
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• pp.28-39
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• 2003

본 논문은 고해상도에 대한 멀티 스펙트럴 영상들에 대한 압축기술에 대한 연구입니다. 원래는 원격센싱 컨텍스트에 대한 개발로 이를 식품과 의료영상에 적용하였습니다마는 이러한 가능성을 여러 컨텍스트에서 처리하는 것을 목표로 두었으며 즉, 원격센싱, 식품모니터링 그리고 의료영상의 새로운 분야로 탐구 및 적용하였다. 압축은 한 화소와 관계한 이웃 간의 화소들 간의 간단한 추정에 기반하여 나타날 수 있도록 하였다. 멀티 스펙트럴 영상들은 화소들이 같은 밴드 안에서 가까이 이웃하여 있는 어떤 상접한 정도의 관계를 해석하였으며 하나의 발견된 상관관계는 어떠한 한 밴드 내에서의 계수에 기반 한다. 그 계수와의 관계는 다른 밴드에서 계산되어진 것과 유사하다. 두 번째의 관찰에서는 개발되어진 알고리즘이 화소당 비트수를 멀티 스펙트럴 위성원격영상에서 16비트에서 4비트로 감소할 수 있었다. 따라서 다른 방법론들과 속도 및 압축률에 대해서 비교 분석하였다. 보통 그래픽 포맷인 GIF, JPEG 그리고 PCX를 사용하였으며 참조와 같이 LZW Huffman과 RLE의 알고리즘을 행하였다. 소개되어진 방법들은 압축을 줄이는 것이 선상, 프로그램 안에서 혹은 관례적인 압축 알고리즘에서 속도와 압축률에서 유사한 결과를 가져왔다.