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Advanced Parameter Identification for a Linear-Motor-Driven Motion System Using Disturbance Observer
Yi-Ren Pan,An-Chen Lee,Yi-Ti Shih,Rong-Hwang Horng 한국정밀공학회 2009 International Journal of Precision Engineering and Vol. No.
Disturbance observer (DOB) is generally introduced into motion control systems to eliminate undesired disturbances and plant uncertainty. The DOB is also used for system identification. This work presents a novel experimental identification algorithm using disturbance observer to identify inertia, viscous coefficient, and friction of linear-motor-driven motion system. A conventionally adopted algorithm for determining the inertia of the motion system based on orthogonal relations among system responses is modified and extended to estimate the viscous coefficient and the magnitude of Coulomb friction of the underlying system. The advantages of the proposed method are high convergence rate and only one experiment needed to evaluate the system parameters. The proposed algorithm is demonstrated to be workable by both simulation and experiment.
Mucilaginibacter limnophilus sp. nov., isolated from a lake
Shih-Yi Sheu,Yi-Ru Xie,Wen-Ming Chen 한국미생물학회 2019 The journal of microbiology Vol.57 No.11
A polyphasic taxonomy approach was used to characterize strain YBJ-36T, isolated from a freshwater lake in Taiwan. Phylogenetic analyses, based on 16S rRNA gene sequences and coding sequences of an up-to-date bacterial core gene set (92 protein clusters), indicated that strain YBJ-36T formed a phylogenetic lineage in the genus Mucilaginibacter. 16S rRNA gene sequence similarity indicated that strain YBJ-36T is closely related to species within the genus Mucilaginibacter (93.8–97.8% sequence similarity) and is most similar to Mucilaginibacter fluminis TTM-2T (97.8%), followed by Mucilaginibacter roseus TTM-1T (97.2%). Microbiological analyses demonstrated that strain YBJ-36T is Gram-negative, aerobic, non-motile, rod-shaped, surrounded by a thick capsule, and forms pink-colored colonies. Strain YBJ-36T grew between 20–40°C (optimal range, 35–37°C), pH 5.5–7.0 (optimal pH of 6) and 0–2% NaCl (optimal concentration, 0.5%). The predominant fatty acids of strain YBJ-36T are iso-C15:0 and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c), the major polar lipid is phosphatidylethanolamine, the major polyamine is homospermidine, and the major isoprenoid quinone is MK-7. The draft genome is approximately 4.63 Mb in size with a G+C content of 42.8 mol%. Strain YBJ-36T exhibited less than 35% DNA-DNA relatedness with Mucilaginibacter fluminis TTM-2T and Mucilaginibacter roseus TTM-1T. Based on phenotypic and genotypic properties and phylogenetic inference, strain YBJ-36T should be classified in a novel species of the genus Mucilaginibacter, for which the name Mucilaginibacter limnophilus sp. nov. is proposed. The type strain is YBJ-36T (= BCRC 81056T = KCTC 52811T = LMG 30058T).
Liquidity in Up and Down Markets for Asset Pricing: Evidence from the Taiwan Stock Market
Yi-Cheng Shih,Xuan-Qi Su 한국증권학회 2016 Asia-Pacific Journal of Financial Studies Vol.45 No.5
Using a sample of stocks listed on the Taiwan Stock Exchange during 1991–2014, this study investigates the liquidity in up and down markets, which is important for understanding asset pricing. Firm-level original Amihud, Journal of Financial Markets, 5, 2002, 31. illiquidity is decomposed into two half-Amihud measures for up- and down-market days. First, we show that the ability of the down-market liquidity level to explain the cross-section of returns subsumes the up-market liquidity level. Second, only loadings on systematic down-market liquidity factors are significantly priced. Third, a liquidity risk factor constructed by the downmarket component, rather than the up-market component significantly explains the time-series and cross-sectional variation in returns sorted by firm size, suggesting that the liquidity risk factor associated with down-market days performs better in capturing the flight-toliquidity. Overall, the findings support the view that the liquidity in down markets plays a more important role in asset pricing than the liquidity in up markets.
Where Are Landscape Designers' Spatial Abilities in the Brain? An fMRI Study
Shih-Han Hung,Chia-Yi Huang,Tsung-Ren Huang,Shih-An Tang,Yu-Ping Tsai,Chun-YenChang 인간식물환경학회 2023 인간식물환경학회지 Vol.26 No.5
Background and objective: To effectively understand and communicate their work, landscape designers should possessexcellent spatial abilities. Neurological methods have confirmed that activation of the occipital lobe, parietal cortex, andprefrontal cortex affect the judgment of space; however, few studies have measured spatial abilities in landscape design. This study aimed to identify the potential role of various brain regions during spatial interpretation processes by landscapedesigners, particularly the effect of stimulating the frontal lobe on enhancing design capabilities. Methods: This study tested the spatial abilities of landscape designers when transforming a planar drawing into a sectionaldrawing and the brain regions activated in this process. The subjects were asked to identify the correct option whenmatching given section lines in a planar drawing. The correct answer rate and response time were used to score brainactivation during spatial task processes. A total of 16 valid subjects were divided into high- and low-accuracy groupsaccording to the correct answer rate. Results: The results for the high-accuracy group showed that the left inferior frontal gyrus was activated during spatialdesign tasks. In contrast, the findings for the low-accuracy group revealed that the left middle occipital gyrus was activatedfor processing visual information. Conclusion: The findings suggest that the frontal lobe plays a role in allowing landscape designers to make planar tocross-sectional inferences via mental rotations and categorical spatial relations. The findings offer implications forlandscape designers in stimulating the frontal lobe and enhancing their design capabilities.
Adaptive Priority-Based Downlink Scheduling for WiMAX Networks
Shih-Jung Wu,Shih-Yi Huang,Kuo-Feng Huang 한국통신학회 2012 Journal of communications and networks Vol.14 No.6
Supporting quality of service (QoS) guarantees for diverse multimedia services are the primary concerns for WiMAX (IEEE 802.16) networks. A scheduling scheme that satisfies QoS requirements has become more important for wireless communications. We propose a downlink scheduling scheme called adaptive priority-based downlink scheduling (APDS) for providing QoS guarantees in IEEE 802.16 networks. APDS comprises two major components: Priority assignment and resource allocation. Different service-type connections primarily depend on their QoS requirements to adjust priority assignments and dispatch bandwidth resources dynamically. We consider both starvation avoidance and resource management. Simulation results show that our APDS methodology outperforms the representative scheduling approaches in QoS satisfaction and maintains fairness in starvation prevention.
India is within Themselves : Traveler and Foreigner in A Passage to India
Shih, Yi-chin Ewha Institute of English and American Studies 2008 Journal of English and American studies Vol.7 No.-
This paper would like to analyze E. M. Forster’s A Passage to India (1924) from the traveling point of view, and the methodology is based on Julia Kristeva’s theory of the abject foreigner. While many critiques on A Passage to India emphasize the dualism between the colonized and colonizer, women and men, Indian and British, the purpose of this paper attempts to reverse and destroy the dual conflicts in the novel by focusing on the travelers. Travel is the best way to understand “the foreigner is within us.” A traveler considers the local people as foreigners, but simultaneously a traveler is seen as a foreigner by them. The subject-and-object relationship is reversed in the travel; in other words, the traveler as a subject is also an object. Travel does not simply reverse this hierarchy, but it also deconstructs this dualist structure, which is to say that a traveler is an object within a subject, meaning he/she is both a subject and an object. Since a traveler contains the two identities, there should not be this dualism. This paper is based on this perspective and it contains three parts. It starts with a discussion of the concept of the foreigner and then analyzes two main travelers in A Passage to India, Mrs. Moore and Adela Quested, individually. Finally, this discussion leads us to reconsider the definition of travel.