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Spatiotemporal Saliency Detection for Video Sequences Based on Random Walk With Restart
Hansang Kim,Youngbae Kim,Jae-Young Sim,Chang-Su Kim IEEE 2015 IEEE TRANSACTIONS ON IMAGE PROCESSING - Vol.24 No.8
<P>A novel saliency detection algorithm for video sequences based on the random walk with restart (RWR) is proposed in this paper. We adopt RWR to detect spatially and temporally salient regions. More specifically, we first find a temporal saliency distribution using the features of motion distinctiveness, temporal consistency, and abrupt change. Among them, the motion distinctiveness is derived by comparing the motion profiles of image patches. Then, we employ the temporal saliency distribution as a restarting distribution of the random walker. In addition, we design the transition probability matrix for the walker using the spatial features of intensity, color, and compactness. Finally, we estimate the spatiotemporal saliency distribution by finding the steady-state distribution of the walker. The proposed algorithm detects foreground salient objects faithfully, while suppressing cluttered backgrounds effectively, by incorporating the spatial transition matrix and the temporal restarting distribution systematically. Experimental results on various video sequences demonstrate that the proposed algorithm outperforms conventional saliency detection algorithms qualitatively and quantitatively.</P>
유한요소법을 이용한 type 4 수소저장용기용 고정 장치의 구조적 안전성 분석에 관한 연구
김건우(GUNWOO KIM),김혜원(HYEWON KIM),박한민(HANMIN PARK),이정호(JEONGHO LEE),유수진(SUJIN YOON),이한수(HANSU LEE),김종열(JOUNGLYUL KIM),이석진(SEOKJIN LEE),유계형(GYEHYOUNG YOO),윤영길(YOUNGGIL YOUN),김한상(HANSANG KIM) 한국수소및신에너지학회 2024 한국수소 및 신에너지학회논문집 Vol.35 No.2
The study involves a finite element analysis to evaluate the structural integrity of the neck mount block for a type 4 hydrogen storage vessel, with the aim of enhancing its strength and rigidity. The existing neck mount block consists of a fixed part and a sliding part, each comprising a body block for load support, a screw part for neck boss fixation, and bolts. To analyze the vulnerabilities of the neck mount block under bolt fastening and load conditions relative to vehicle travel directions, a structural analysis process was developed. Comparative analysis between the enhanced design and the existing model was performed, resulting in improved strength and rigidity. The objective is to provide guidance for the current product development and to offer fundamental data for the design and structural analysis of future development projects.
Kim Kisuk,Kim Jaewon,Lee Changmu,Kim Joorak,Lee Hansang 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
This paper presents an PSO-based optimization methodology for estimating the capacities and initial SOC of an energy storage systems (ESSs) in a DC electric railway system. The proposed method calculates the optimal solution using the missing capacity caused by the limited storage capacity. The missing capacity can be estimated through continuous-powerfl ow analysis. In many previous studies, capacities was calculated by assuming the each ESS as an independent device. However, since each storage device aff ects the charging and discharging operation of each other, this assumption might aff ect the convergence characteristics. In this paper, to solve this problem, the missing capacity of the ESS at both sides is refl ected by using the relating coeffi cient derived based on the electrical distance between storage devices. The case studies show that the most effi cient operation without missing capacity is possible under the derived capacities and initial SOC
Power Flow Calculation Method of DC Distribution Network for Actual Power System
Kim, Juyong,Cho, Jintae,Kim, Hongjoo,Cho, Youngpyo,Lee, Hansang Korea Electric Power Corporation 2020 KEPCO Journal on electric power and energy Vol.6 No.4
DC distribution system has been evaluated as an excellent one in comparison with existing AC distribution network because it needs fewer power conversion stages and the full capacity of the equipment can be used without consideration for power factor. Recently, research and development on the implementation of DC distribution networks have been progressed globally based on the rapid advancement in power-electronics technology, and the technological developments from the viewpoint of infrastructure are also in progress. However, to configure a distribution network which is a distribution line for DC, more accurate and rapid introduction of analysis technology is needed for the monitoring, control and operation of the system, which ensure the system run flexible and efficiently. However, in case of a bipolar DC distribution network, there are two buses acting as slack buses, so the Jacobian matrix cannot be configured. Without solving this problem, DC distribution network cannot be operated when the network is unbalanced. Therefore, this paper presented a comprehensive method of analysis with consideration of operating elements which are directly connected between neutral electric potential caused by the unbalanced of load in DC distribution network with bipolar structure.
HANSANG A. KIM 계명대학교 한국학연구원 2020 Acta Koreana Vol.23 No.1
Taking recourse to the Aristotelian theory of four causes and the distinction between substance and accidents, as well as to the concept of intellectual consciousness (lingjue 靈覺), Matteo Ricci (Li Madou 利瑪竇, 1552–1610) argued that the notions of taiji 太極 and li 理 as expounded by Zhu Xi 朱熹 (1130–1200) cannot serve as the origin of existence, as their metaphysical equivalent God, does in Catholic Christianity. Taiji and li do not have consciousness and are moreover merely “accidents.” Unlike “substance,” an “accident” is something that is not essential for something to be what it is. Tasan Chŏng Yagyong 茶山 丁若鏞 (1762– 1836) follows Ricci in claiming that li is but an accident, and no more than the “formal cause” of each individual object. A “formal cause” is what something is or should be, as distinct from the “material cause” (that of which it is made), the “efficient cause” (that which gives it shape or motion), or the “final cause” (the goal for which it is intended). Ricci and Tasan did not acknowledge the role of li as the “principle, ground, cause or the reason for the existence and operation of qi 氣” (suoyi 所以) as held by Zhu Xi’s school of nature and principle. Like Ricci, Tasan also dismissed the concept of taiji as “the undifferentiated state before heaven and earth came to be divided.” However, Tasan diverged markedly from Ricci with respect to the critique of the tenet “Nature is in fact principle (Xing ji li 性卽理)”. Although Tasan and Ricci both separated xing 性 from li and deconstructed the meaning of xing from its connotation of original moral human nature, Tasan’s reconstructed xing is quite different from Ricci’s understanding “nothing other than the fundamental (ben 本) essence (ti 體) of each category of things.” Tasan’s unique contribution is his new definition of xing (K. sŏng) as the appetite or preference/proclivity [for the moral good] (K. kiho, C. shihao 嗜好), which is quite Mencian in its affirmation of the presence of an incipient tendency toward the good in human beings. That he mentions that this xing (K. sŏng), although divested of its a priori metaphysical connotations, is still mandated and bestowed by heaven as stated in the Zhongyong 中庸 [Doctrine of the Mean] further testifies to Tasan’s continued engagement with the classics.
Repair of aircraft structures using composite patches bonded through induction heating
Kim, Minho,Kim, Hansang,Lee, Wooil The Korean Society for Composite Materials 2015 Advanced composite materials Vol.24 No.4
In this study, we investigated the use of composite patches to repair aluminum alloy double-lap joints. The carbon composite patches were cured using induction curing or oven curing. Joints were repaired using precured or cocured composite patches. The bond strengths of the different joints were compared. We also investigated whether the incorporation of carbon nanotubes (CNTs) in the adhesive bondline affected bond strength. We found that the induction-cured samples exhibited bond strengths similar to those of the corresponding oven-cured samples; this was true for both the baseline and the CNT-reinforced samples. Further, the samples processed using cocured patches exhibited higher bond strengths than did the corresponding samples processed using precured patches. In the case of both the precured and the cocured patch samples, the dispersion of 0.5 wt% CNTs in the adhesive bondline increased the bond strength slightly. The effect of the two different types of patches placed on top of the aluminum substrate on the rate of temperature increase by induction curing was shown experimentally, and, numerical simulations were performed to verify the experimental results. The results from this study show that the induction curing and co-curing method may be regarded as a sound and efficient method for composite patch bonding repair.