• 영어어문교육
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• 제8권2호
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• pp.131-150
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• 2003

The purpose of this paper is to provide two levels of conceptualization of a category such as an absolute category in semantic level and a relative category in pragmatic level on the basis of Aristotelian category theory and prototype category theory. I do not intend to criticize classical category theory and prototype category theory but to show that these two types of category are applied to the different world. Aristotelian categorization is an absolute category because it is based on the possible world called the meta-world and it has an absolute truth value. The members of an absolute category is presented as a set. There is a clear boundary between members and non-members because they are distinguished by the absolute criteria An absolute category is semantic conceptualization. This absolute category is changed into a relative category when it is applied in the real world. A relative category which corresponds to a prototype category is based on the real world called the object world and it has a relative truth value. Here individuals are categorized by the cognition and perception of human beings. A relative category is pragmatic conceptualization. In conclusion, while classical categories which are called absolute categories represent sentence meaning, prototype categories which are called relative categories represent utterance meaning.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.508-511
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• 2007

Car navigation system is one of the most important applications in telematics. A newest trend of car navigation system is using real video captured by camera equipped on the vehicle, because video can overcome the semantic gap between map and real world. In this paper, we suggest a visual car navigation system that visually represents navigation information or route guidance. It can improve drivers' understanding about real world by capturing real-time video and displaying navigation information overlaid on it. Main services of the visual car navigation system are graphical turn guidance and lane change guidance. We suggest the system architecture that implements the services by integrating conventional route finding and guidance, computer vision functions, and augmented reality display functions. What we designed as a core part of the system is visual navigation controller, which controls other modules and dynamically determines visual representation methods of navigation information according to a determination rule based on current location and driving circumstances. We briefly show the implementation of system.

• 전자통신동향분석
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• 제36권1호
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• pp.99-108
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• 2021

Digital twins are digital replicas of objects and systems in the real world. These digital replicas in a virtual environment can be connected with smart sensors and a variety of analyses, and simulations of real-time data from these sensors enable effective the operation, rapid feedback, and future predictions of real world phenomena. Until now, digital twins have been adopted and used mainly in the field of manufacturing, especially for smart factories. As digital twins are expected to be useful not only for productivity improvement but also for social problem solving, it is predicted that they will be extended to other fields such as those of transportation and cities. Digital twins will especially help realize smart cities through real-time monitoring, operation, and predictions using virtual digital twin cities. This paper summarizes the trends in digital twins for smart cities, the concept of digital twins, their application to smart cities, the strategies of various countries, and the development status of companies.

• International journal of advanced smart convergence
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• 제11권3호
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• pp.56-63
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• 2022

Cyber-physical systems (CPSs) can solve real problems by utilizing closely connected resources in the cyber world. Most problems arise because the physical world is uncertain and unpredictable. To address this uncertainty, information pouring from numerous devices must be collected in real-time, and each interconnected device must share the information. At this time, CPS must meet timing-related techniques and strict timing constraints that can deliver accurate information within predefined deadlines in order to interact closely beyond simply connecting the cyber and physical worlds. Timing errors in safety-critical systems, such as automobiles, aviation, and medical systems, can lead to catastrophic disasters. In this paper, we classify timing problems into two types: real-time delay and synchronization problems. The results of this study can be used in the entire process of CPS system design, implementation, operation, verification, and maintenance. As a result, it can contribute to securing the safety and reliability of CPS.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.434-435
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• 2021

본 연구는 현재 제작되어지고 있는 메타버스 사례를 살펴보고 향후 메타버스의 방향에 대하여 제언하고자 한다. 그 결과, 메타버스는 실세계 경제, 사회, 문화 등과 연결되면서 성장할 것이다. 예를 들면 실세계 부동산 가격이 오르면 메타버스 속의 디지털 부동산 가격도 상승한다는 것이다. 향후 메타버스와 메타버스 간의 연결 등을 통해, 국가와 국가 간의 경계를 허물어 지구촌을 하나로 연결하게 되는 것이다.

• 로봇학회논문지
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• 제19권2호
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• pp.188-195
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• 2024

This paper proposes a photorealistic real-time dense 3D mapping system that utilizes a neural network-based image enhancement method and mesh-based map representation. Due to the characteristics of the underwater environment, where problems such as hazing and low contrast occur, it is hard to apply conventional simultaneous localization and mapping (SLAM) methods. At the same time, the behavior of Autonomous Underwater Vehicle (AUV) is computationally constrained. In this paper, we utilize a neural network-based image enhancement method to improve pose estimation and mapping quality and apply a sliding window-based mesh expansion method to enable lightweight, fast, and photorealistic mapping. To validate our results, we utilize real-world and indoor synthetic datasets. We performed qualitative validation with the real-world dataset and quantitative validation by modeling images from the indoor synthetic dataset as underwater scenes.

• Journal of the Korean Data and Information Science Society
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• 제14권1호
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• pp.103-111
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• 2003

Kernel machines are used widely in real-world regression tasks. Kernel ridge regressions(KRR) and support vector machines(SVM) are typical kernel machines. Here, we focus on two types of KRR. One is inductive KRR. The other is transductive KRR. In this paper, we study how differently they work in the interpolation and extrapolation areas. Furthermore, we study prediction interval estimation method for KRR. This turns out to be a reliable and practical measure of prediction interval and is essential in real-world tasks.

• The Journal of the Acoustical Society of Korea
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• 제25권4E호
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• pp.148-153
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• 2006

A new normalized MBD algorithm is presented for nonstationary convolutive mixtures and its properties/modifications are discussed in details. The proposed algorithm normalizes the signal spectrum in the frequency domain to provide faster stable convergence and improved separation without whitening effect. Modifications such as nonholonomic constraints and off-diagonal learning to the proposed algorithm are also discussed. Simulation results using a real-world recording confirm superior performanceof the proposed algorithm and its usefulness in real world applications.

• 한국콘텐츠학회논문지
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• 제18권1호
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• pp.55-63
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• 2018

본 논문에서는 한국 가상현실 게임소설에 나타난 게임과 소설의 재매개 양상을 분석하고, 이를 통해 한국 가상현실 게임소설의 서사적 특징을 도출했다. 나아가 웹을 기반으로 삼는 한국 게임소설이 대중문학으로서 확장될 수 있는 가능성을 모색하는 데에 그 목적을 둔다. 한국 가상현실 게임소설에서 주인공은 20대 남성으로, 신자유주의 사회에서 소외된 계층이자 결핍된 성과주체로 설정된다. 이들은 현실 세계의 결핍요소 때문에 가상세계로 진입하는데, 이 때 해외 게임소설에서 강조되는 가상세계로의 접속 방법 및 과정 등이 국내 소설의 경우 소략하게 제시된다. 또한 한국 가상현실 게임소설의 주인공이 수행하는 반복적 행동은 자기 파괴적인 노동의 범주에 속하며, 주인공은 나르시시즘적 징후를 보인다. 마지막으로 한국 가상현실 게임소설에서는 마법원이 흐릿하게 나타나면서 현실 세계와 가상세계가 연계되어 나타난다. 이 과정에서 가상세계가 현실의 문제를 해결할 수 있는 대체적 공간으로 기능한다. 이러한 서사적 특징은 북미 유럽 등과 차별적인 한국 게임소설만의 특이점이다.

• 토지주택연구
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• 제13권4호
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• pp.91-103
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• 2022

주거는 현실세계에서 중요한 의미를 가진다. 그에 비해 메타버스의 주거는 다양한 메타버스 서비스 플랫폼들에서 만들어지고 있으나 아직까지 다른 건축 유형들에 비해 관심이 부족하다. 본 연구는 주거의 의미, 유형과 특성에 기초하여 현실세계의 주거 모델을 바탕으로 메타버스 주거의 개념을 확립하고 발전 방향을 모색하고자 한다. 이를 위해 선행연구 조사, 기존 주거 모델 분석, 메타버스 주거 사례 연구 및 설문조사를 실시하였다. 또한 분석된 내용을 토대로 물리적, 사회적, 개인적 모델을 포함하는 메타버스 주거 모델을 제시하였고, 물리적 모델의 공간 꾸미기 및 피난처 특징과 개인적 모델의 자기표현 특징을 메타버스 주거를 가장 잘 나타낼 수 있는 특징으로 파악하였다. 본 연구의 결과가 향후 메타버스 가상세계 연구 및 서비스 플랫폼 개발에 도움이 될 수 있을 것이라 기대한다.