• Nuclear Engineering and Technology
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• 제54권3호
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• pp.1037-1048
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• 2022

A radioactive isotope identification algorithm is a prerequisite for a low-resolution scintillation detector applied to an unmanned radiation monitoring system. In this paper, a sparse representation with dictionary learning approach is proposed and applied to plastic gamma-ray spectra. Label-consistent K-SVD was used to learn a discriminative dictionary for the spectra corresponding to a mixture of four isotopes (¹³³Ba, ²²Na, ¹³⁷Cs, and ⁶⁰Co). A Monte Carlo simulation was employed to produce the simulated data as learning samples. Experimental measurement was conducted to obtain practical spectra. After determining the hyper parameters, two dictionaries tailored to the learning samples were tested by varying with the source position and the measurement time. They achieved average accuracies of 97.6% and 98.0% for all testing spectra. The average accuracy of each dictionary was above 96% for spectra measured over 2 s. They also showed acceptable performance when the spectra were artificially shifted. Thus, the proposed method could be useful for identifying radioisotopes in gamma-ray spectra from a plastic scintillation detector even when a dictionary is adapted to only simulated data. Furthermore, owing to the outstanding properties of sparse representation, the proposed approach can easily be built into an insitu monitoring system.

• 한국컴퓨터그래픽스학회논문지
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• 제30권3호
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• pp.109-123
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• 2024

딥러닝과 강화학습을 활용한 비전 기반 엔드투엔드 자율주행 시스템 관련 연구가 지속적으로 증가하고 있다. 일반적으로 이러한 시스템은 위치, 속도, 방향, 센서 데이터 등 연속적이고 고차원적인 차량의 상태를 잠재 특징 벡터로 인코딩하고, 이를 차량의 주행 정책으로 디코딩하는 두 단계로 구성된다. 도심 주행과 같이 다양하고 복잡한 환경에서는 Variational Autoencoder(VAE)나 Convolutional Neural Network(CNN)과 같은 네트워크를 이용한 효율적인 상태 표현 방법의 필요성이 더욱 부각된다. 본 논문은 차량의 이미지 상태 표현이 강화학습 성능에 미치는 영향을 분석하였다. CARLA 시뮬레이터 환경에서 실험을 수행하였고, 차량의 전방 카메라 센서로부터 취득한 RGB 이미지 및 Semantic Segmented 이미지를 각각 VAE와 Vision Transformer(ViT) 네트워크로 특징 추출하여 상태 표현 학습에 활용하였다. 이러한 방법론이 강화학습에 미치는 영향을 실험하여, 데이터 유형과 상태 표현 기법이 자율주행의 학습 효율성과 결정 능력 향상에 어떤 역할을 하는지를 실험하였다.

• Korean Journal of Mathematics
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• 제12권2호
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• pp.107-115
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• 2004

In this paper, the new subclass denoted by $S_p({\alpha},{\beta},{\xi},{\gamma})$ of $p$-valent holomorphic functions has been introduced and investigate the several properties of the class $S_p({\alpha},{\beta},{\xi},{\gamma})$. In particular we have obtained integral representation for mappings in the class $S_p({\alpha},{\beta},{\xi},{\gamma})$) and determined closed convex hulls and their extreme points of the class $S_p({\alpha},{\beta},{\xi},{\gamma})$.

• 충청수학회지
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• 제24권4호
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• pp.869-881
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• 2011

The main goal in the present paper is to obtain a necessary and sufficient condition for a new connection with zero torsion vector to be an Einstein's connection and derive some useful representation of the vector defining the Einstein's connection in even-dimensional UFT $X_n$.

• Journal of applied mathematics & informatics
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• 제6권2호
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• pp.575-588
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• 1999

Lower dimensional cases of Einstein's connection were al-ready investigated by many authors for n =2,4. This paper is to ob-tain a surveyable tensorial representation of n-dimensional Einstein's connection in terms of the unified field tensor with main emphasis on the derivation of powerful and useful recurrence relations which hold in n-dimensional Einstein's unified field theory(i.e., n-*g-UFT): All con-siderations in this paper are restricted to the third class only.

• 대한수학회논문집
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• 제9권3호
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• pp.607-616
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• 1994

I. M. Gelfand and G. E. Shilov [GS] introduced the Gelfand-Shilov spaces of type S, generalized type S and type W of test functions to investigate the uniqueness of the solutions of the Cauchy problems of partial differential equations. Using the heat kernel method Matsuzawa gave structure theorems for distributions, hyperfunctions and generalized functions in the dual space $(S^s_r)'$ of the Gelfand-Shilov space of type S in [M1, M2 and DM], respectively. Also, we gave structure theorems for ultradistributions, Fourier hyperfunctions in [CK, KCK], respectively.

• 대한수학회논문집
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• 제18권1호
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• pp.151-157
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• 2003

The aim of this paper is to derive the well-known q-analog of kummer's theorem by using q-integral representation. In addition to this, two results closely related to the q-kummer's theorem have also been obtained by the same method.

• 대한수학회보
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• 제35권4호
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• pp.641-652
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• 1998

Chung and et al. ([2].1991) introduced a new concept of a manifold, denoted by $^{\ast}g-SEX_n$, in Einstein's n-dimensional $^{\ast}g$-unified field theory. The manifold $^{\ast}g-SEX_n$ is a generalized n-dimensional Riemannian manifold on which the differential geometric structure is imposed by the unified field tensor $^{\ast}g^{\lambda \nu}$ through the SE-connection which is both Einstein and semi-symmetric. In this paper, they proved a necessary and sufficient condition for the unique existence of SE-connection and sufficient condition for the unique existence of SE-connection and presented a beautiful and surveyable tensorial representation of the SE-connection in terms of the tensor $^{\ast}g^{\lambda \nu}$. Recently, Chung and et al.([3],1998) obtained a concise tensorial representation of SE-curvature tensor defined by the SE-connection of $^{\ast}g-SEX_n$ and proved deveral identities involving it. This paper is a direct continuations of [3]. In this paper we derive surveyable tensorial representations of constracted curvature tensors of $^{\ast}g-SEX_n$ and prove several generalized identities involving them. In particular, the first variation of the generalized Bianchi's identity in $^{\ast}g-SEX_n$, proved in theorem (2.10a), has a great deal of useful physical applications.

• International Journal of Contents
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• 제16권3호
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• pp.51-65
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• 2020

Narratives arouse diverse and rich affective responses to recipients, and this is one of the reasons why narratives are universal and popular. Computational studies on narratives have established a formal model or system of the affective response based on the theory in psychology or media research, and have analyzed or generated a narrative that can evoke a specific affective response. In this paper, we propose a new computational model that can detect the affective response expected to appear in the narrative based on the narrative agent's knowledge. First, we designed a narrative representation model that can elaborately express the event structure and the agent's knowledge as well. Additionally, an analysis method was proposed to detect the three affective responses and the related situational information. Then, we validated the model through a case study about an actual movie narrative. Through the case study, we confirmed that the model captures the affective responses of the audience. The proposed model can be effectively used for the narrative analysis and the creation that must consider the affective responses of the recipient.

• 한국실내디자인학회논문집
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• 제15권2호
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• pp.3-12
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• 2006

The renaissance architects had considered perspective system as accurate tool for the visual representation, but Palladio did not agree with this belief and demonstrated that it is a system based on optical illusionism. On the base of this faith, he created another optical illusion system can be called 'scenographic space'. But the remainder of his works reveals many perspective installations mobilized as well as it. In this context, this study aimed to analyze the meaning and usage of these two space composition systems in the Palladio's architecture. For the purpose of it, a preliminary study examine the background of his idea and make a comparative analysis between the two systems, and then finally analyze the concrete works in compliance with the building types. And then, this study comes to the following conclusion. The scenographic space create the cognition of discontinuity which was produced by the perceptual mask perpendicular to the subject's eye. In opposition to it, the perspective techniques join the space between the subject and his outer world. In result, the viewer lost or attach his attention on the connection between the real and the virtual, the secular and the divine, and the inside and the outside. Palladio applied these two illusion systems to all types of his architecture. By means of it, he could achieve the desire of his patrons and reconstruct the classical architecture of the late renaissance age.