• 제목/요약/키워드: Dual-Function

검색결과 706건 처리시간 0.027초

주행차량의 복륜 여부 판정을 통한 차종분류 방안 (Development of Vehicle Classification Method using Discriminant Function Based on Detection of Dual Tire)

  • 오주삼
    • 대한토목학회논문집
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    • 제30권1D호
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    • pp.45-51
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    • 2010
  • 차종별 교통량 자료는 도로의 운영, 제어, 유지관리 계획 수립 및 과적차량 단속에도 매우 중요한 자료이다. 본 논문에서는 축검지 센서를 차량 진행방향에 대해서 경사지게 설치하고 이를 통해서 얻어지는 자료를 활용하여 차종분류 알고리즘을 개발하였다. 새로운 개발한 차종분류 알고리즘에서는 2축 차량에서 후륜 차량바퀴의 복륜 여부를 새로운 분류변수로 설정하였다. 분석대상이 차량은 1,878대로 CCTV를 활용하여 기록했으며 인력식 조사를 통하여 복륜여부와 차종을 구분하였다. 계측된 차량바퀴 접지면의 대각선 길이 성분의 크기를 입력 자료로 활용한 판별분석을 통하여 후륜바퀴가 복륜인지 단륜인지를 구분하였다. 복륜 여부만을 이용하여 차종분류를 했을 때, 차종분류의 정확도는 1종에 속하는 차량의 경우는 96.92%, 3종에 속하는 차량에서는 82.91% 그리고 4종에 속하는 차량에서는 79.13%에 이르는 것으로 분석되었다.

Multispectral X-ray imaging to distinguish among dental materials

  • Peter, Ann-Christin;Schnaubelt, Matthias;Gente, Michael
    • Imaging Science in Dentistry
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    • 제47권4호
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    • pp.247-254
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    • 2017
  • Purpose: Dual-energy X-ray imaging is widely used today in various areas of medicine and in other applications. However, no similar technique exists for dental applications. In this study, we propose a dual-energy technique for dental diagnoses based on voltage-switching. Materials and Methods: The method presented in this study allowed different groups of materials to be classified based on atomic number, thereby enabling two-dimensional images to be colorized. Computer simulations showed the feasibility of this approach. Using a number of different samples with typical biologic and synthetic dental materials, the technique was applied to radiographs acquired with a commercially available dental X-ray unit. Results: This technique provided a novel visual representation of the intraoral environment in three colors, and is of diagnostic value when compared to state-of-the-art grayscale images, since the oral cavity often contains multiple permanent foreign materials. Conclusion: This work developed a technique for two-dimensional dual-energy imaging in the context of dental applications and showed its feasibility with a commercial dental X-ray unit in simulation and experimental studies.

이중 일함수 구조를 적용한 N-채널 EDMOS 소자의 항복전압 및 온-저항 특성 (Breakdown Voltage and On-resistance Characteristics of N-channel EDMOS with Dual Work Function Gate)

  • 김민선;백기주;김영석;나기열
    • 한국전기전자재료학회논문지
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    • 제25권9호
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    • pp.671-676
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    • 2012
  • In this paper, TCAD assessment of 30-V class n-channel EDMOS (extended drain metal-oxide-semiconductor) transistors with DWFG (dual work function gate) structure are described. Gate of the DWFG EDMOS transistor is composed of both p- and n-type doped region on source and drain side. Additionally, lengths of p- and n-type doped gate region are varied while keeping physical channel length. Two-dimensional device structures are generated trough TSUPREM-4 and their electrical characteristics are investigated with MEDICI. The DWFG EDMOS transistor shows improved electrical characteristics than conventional device - i.e. higher transconductance ($g_m$), better drain output current ($I_{ON}$), reduced specific on-resistances ($R_{ON}$) and higher breakdown characteristics ($BV_{DSS}$).

이중 편파 안테나시스템의 오수신 확률 분석 (Outage Probability Analysis of Dual-Polarized Antenna System)

  • 왕한호;노고산;방승재;박윤옥
    • 한국통신학회논문지
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    • 제39A권12호
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    • pp.771-773
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    • 2014
  • 이중 편파 안테나 시스템은 근거리 가시광 통신 채널 환경에서 통신하기 위한 기술로 연구되어왔다. 본 논문에서는 편파 회전각이 미정렬된 상황에서 편파 안테나 간 발생하는 간섭을 고려한 랜덤 변수의 확률 밀도 함수를 구하고, 오수신(outage) 확률을 분석하였다. 또한 편파 회전각이 미정렬된 이중 편파 안테나 시스템의 상한 전송 용량이 4.5324 bps/hz 임을 밝혔다.

인지기능 감퇴가 있는 노인의 이중 과제 보행과 인지기능과의 상관성에 대한 체계적 문헌 고찰 (The Correlation between Gait and Cognitive Function in Dual-task Walking of the Elderly with Cognitive Impairment: A Systematic Literature Review)

  • 신재연;김예진;김지수;민수빈;박재니;배재한;서희은;신희선;유영은;임주영;장지수;조영우;이한숙
    • 대한물리의학회지
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    • 제17권1호
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    • pp.93-108
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    • 2022
  • PURPOSE: This review sought to confirm the correlation between dual-task gait and cognitive function in cognitively impaired and healthy older adults. METHOD: We used four databases (DBs), Pubmed, Cochrane library, Kmbase, and Koreamed. Searches were carried out according to the PICOS method, P (participants) were the elderly (above 65 years) with cognitive decline, I (intervention) was walking with dual tasks, C (control group) comprised the elderly without cognitive decline, O (outcome) was the correlation between gait and cognitive function and S (study) was the cross-sectional study. For the methodological quality assessment of each study, we used the Quality Assessment Tool for Observation Cohort and Cross-Sectional Studies provided by the National Institutes of Health (NIH). RESULTS: A total of 10 articles were included in this systematic review. For the components of gait, we used pace, rhythm, and variability and we observed that mild cognitive impairment mostly causes low gait performance while performing dual tasks. Among the 10 articles, 9 articles studied pace, of which 7 showed significant results. However, 2 were not significant. Also, 1 article that studied rhythm and 3 articles that studied variability showed significant results. The methodological quality of the 10 studies was fair. CONCLUSION: Gait pace was found to have a high correlation between memory, which is a cognitive ability, and overall cognitive function. It was observed that older adults with mild cognitive impairment have reduced gait pace in single-task walking, and further decrease in dual-task gait pace shows the correlation between memory and gait pace during walking.

Effect of Dual Task Training in Visual Control and Unstable Base on the Gait of Stroke Patient

  • Lee, Sa Gyeom;Kim, Yang Rae
    • 국제물리치료학회지
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    • 제6권1호
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    • pp.788-794
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    • 2015
  • This study examines changes in walking ability among patients with stroke after applying dual-task training under the condition of visual control and unstable supporting ground; the purpose is to provide reference data for selecting intervention methods that enhance the walking ability of patients with stroke. Among the patients with stroke who received rehabilitation treatment(at Rehabilitation Hospital B in Gyeonggi, South Korea from May 2014 to July 2014), 29 patients were selected as research subjects; all of them understood the purpose and contents of this research and agreed to participate in the experiment. The research subjects were divided into a visual control and unstable supporting ground dual-task(VUDT) group(10 patients), a visual control dual-task(VDT) group(10 patients), and an unstable supporting ground dual-task(UDT) group(9 patients); all of the subjects received 30-minute trainings, three times a week for a total of four weeks. A Timed-Up-and-Go(TUG) test was performed to investigate the change of walking function among the subjects, and a 10m walking test was conducted to measure their walking speed. According to the study results, all three groups showed significant differences after dual-task training; the dual-task training group under the condition of visual control and unstable supporting ground showed the most prominent change. This study confirmed that dual-task training using visual control and unstable supporting ground has a positive impact on the walking ability of patients with stroke. Through the study results, we found that implementing dual-task training under the condition of visual control and unstable supporting ground can more effectively improve the walking ability of patients with stroke, rather than performing visual control dual-task training or unstable supporting ground dual-task training only.

Multi-Radial Basis Function SVM Classifier: Design and Analysis

  • Wang, Zheng;Yang, Cheng;Oh, Sung-Kwun;Fu, Zunwei
    • Journal of Electrical Engineering and Technology
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    • 제13권6호
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    • pp.2511-2520
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    • 2018
  • In this study, Multi-Radial Basis Function Support Vector Machine (Multi-RBF SVM) classifier is introduced based on a composite kernel function. In the proposed multi-RBF support vector machine classifier, the input space is divided into several local subsets considered for extremely nonlinear classification tasks. Each local subset is expressed as nonlinear classification subspace and mapped into feature space by using kernel function. The composite kernel function employs the dual RBF structure. By capturing the nonlinear distribution knowledge of local subsets, the training data is mapped into higher feature space, then Multi-SVM classifier is realized by using the composite kernel function through optimization procedure similar to conventional SVM classifier. The original training data set is partitioned by using some unsupervised learning methods such as clustering methods. In this study, three types of clustering method are considered such as Affinity propagation (AP), Hard C-Mean (HCM) and Iterative Self-Organizing Data Analysis Technique Algorithm (ISODATA). Experimental results on benchmark machine learning datasets show that the proposed method improves the classification performance efficiently.

WEAKLY DENSE IDEALS IN PRIVALOV SPACES OF HOLOMORPHIC FUNCTIONS

  • Mestrovic, Romeo;Pavicevic, Zarko
    • 대한수학회지
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    • 제48권2호
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    • pp.397-420
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    • 2011
  • In this paper we study the structure of closed weakly dense ideals in Privalov spaces $N^p$ (1 < p < $\infty$) of holomorphic functions on the disk $\mathbb{D}$ : |z| < 1. The space $N^p$ with the topology given by Stoll's metric [21] becomes an F-algebra. N. Mochizuki [16] proved that a closed ideal in $N^p$ is a principal ideal generated by an inner function. Consequently, a closed subspace E of $N^p$ is invariant under multiplication by z if and only if it has the form $IN^p$ for some inner function I. We prove that if $\cal{M}$ is a closed ideal in $N^p$ that is dense in the weak topology of $N^p$, then $\cal{M}$ is generated by a singular inner function. On the other hand, if $S_{\mu}$ is a singular inner function whose associated singular measure $\mu$ has the modulus of continuity $O(t^{(p-1)/p})$, then we prove that the ideal $S_{\mu}N^p$ is weakly dense in $N^p$. Consequently, for such singular inner function $S_{\mu}$, the quotient space $N^p/S_{\mu}N^p$ is an F-space with trivial dual, and hence $N^p$ does not have the separation property.

PROXIMAL AUGMENTED LAGRANGIAN AND APPROXIMATE OPTIMAL SOLUTIONS IN NONLINEAR PROGRAMMING

  • Chen, Zhe;Huang, Hai Qiao;Zhao, Ke Quan
    • Journal of applied mathematics & informatics
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    • 제27권1_2호
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    • pp.149-159
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    • 2009
  • In this paper, we introduce some approximate optimal solutions and an augmented Lagrangian function in nonlinear programming, establish dual function and dual problem based on the augmented Lagrangian function, discuss the relationship between the approximate optimal solutions of augmented Lagrangian problem and that of primal problem, obtain approximate KKT necessary optimality condition of the augmented Lagrangian problem, prove that the approximate stationary points of augmented Lagrangian problem converge to that of the original problem. Our results improve and generalize some known results.

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EFFICIENT PARAMETERS OF DECOUPLED DUAL SINGULAR FUNCTION METHOD

  • Kim, Seok-Chan;Pyo, Jae-Hong
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • 제13권4호
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    • pp.281-292
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    • 2009
  • The solution of the interface problem or Poisson problem with concave corner has singular perturbation at the interface corners or singular corners. The decoupled dual singular function method (DDSFM) which exploits the singular representations of the solutions was suggested in [3, 9] and estimated optimal accuracy in [10]. The convergence rates consist with theoretical results even for the problems with very strong singularity, with the efficiency depending on parameters used in the methods. Furthermore the errors in $L^2$ and $L^\infty$-spaces display some oscillation, in the cases with meshsize not small enough. In this paper, we present an answer to remove the oscillation via numerical experiments. We observe the effects of parameters in DDSFM, and show the consisting efficiency of the method over the strong singularity.

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