Passive, semi-active, and active tuned-liquid-column dampers

Chen, Yung-Hsiang,Ding, Ying-Jan Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.30 No.1

The dynamic characteristics of the passive, semi-active, and active tuned-liquidcolumn dampers (or TLCDs) are studied in this paper. The design of the latter two are based on the first one. A water-head difference (or simply named as water head in this paper) of a passive TLCD is pre-set to form the so-called semi-active one in this paper. The pre-set of water head is released at a proper time instant during an earthquake excitation in order to enhance the vibration reduction of a structure. Two propellers are installed along a shaft inside and at the center of a passive TLCD to form an active one. These two propellers are driven by a servo-motor controlled by a computer to provide the control force. The seismic responses of a five-story shear building with a passive, semiactive, and active TLCDs are computed for demonstration and discussion. The responses of this building with a tuned mass damper (or TMD) are also included for comparison. The small-scale shaking-table experiments of a pendulum-like system with a passive or active TLCD to harmonic and seismic excitations are conducted for verification.

Passive, semi-active, and active tuned-liquid-column dampers

Yung-Hsiang Chen,Ying-Jan Ding 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.30 No.1

The dynamic characteristics of the passive, semi-active, and active tuned-liquidcolumn dampers (or TLCDs) are studied in this paper. The design of the latter two are based on the first one. A water-head difference (or simply named as water head in this paper) of a passive TLCD is pre-set to form the so-called semi-active one in this paper. The pre-set of water head is released at a proper time instant during an earthquake excitation in order to enhance the vibration reduction of a structure. Two propellers are installed along a shaft inside and at the center of a passive TLCD to form an active one. These two propellers are driven by a servo-motor controlled by a computer to provide the control force. The seismic responses of a five-story shear building with a passive, semiactive, and active TLCDs are computed for demonstration and discussion. The responses of this building with a tuned mass damper (or TMD) are also included for comparison. The small-scale shaking-table experiments of a pendulum-like system with a passive or active TLCD to harmonic and seismic excitations are conducted for verification.

Antioxidative and Hepatoprotective Effects of Magnolol on Acetaminophen-induced Liver Damage in Rats

Yung-Hsiang Chen,Feng-Yen Lin,Po-Len Liu,Yi-Tsau Huang,Jen-Hwey Chiu,Yi-Chun Chang,Kee-Ming Man,Chuang-Ye Hong,Yen-Yi Ho,Ming-Tsung Lai 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.2

Acute liver failure (ALF), an often fatal condition characterized by massive hepatocyte necrosis, is frequently caused by drug poisoning, particularly with acetaminophen (N-acetyl-p-aminophenol/APAP). Hepatocyte necrosis is consecutive to glutathione (GSH) depletion and mitochondrial damage caused by reactive oxygen species (ROS) overproduction. Magnolol, one major phenolic constituent of Magnolia officinalis, have been known to exhibit potent antioxidative activity. In this study, the anti-hepatotoxic activity of magnolol on APAP-induced toxicity in the Sprague-Dawley rat liver was examined. After evaluating the changes of several biochemical parameters in serum, the levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT), and lactate dehydrogenase (LDH) were elevated by APAP (500 mg/kg) intraperitoneal administration (8 and 24 h) and reduced by treatment with magnolol (0.5 h after APAP administration; 0.01, 0.1, and 1 μg/kg). Histological changes around the hepatic central vein, lipid peroxidation (thiobarbituric acid-reactive substance/TBARS), and GSH depletion in liver tissue induced by APAP were also recovered by magnolol treatment. The data show that oxidative stress followed by lipid peroxidation may play a very important role in the pathogenesis of APAP-induced hepatic injury; treatment with lipid-soluble antioxidant, magnolol, exerts anti-hepatotoxic activity. Our study points out the potential interest of magnolol in the treatment of toxic ALF.

Optimal damping ratio of TLCDs

Chen, Yung-Hsiang,Chao, Chen-Chi Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.9 No.3

The study of the optimal damping ratio of a tuned liquid-column damper (or TLCD) attached to a single-degree-of-freedom system is presented. The tuned liquid-column damper is composed of two vertical columns connected by a horizontal section in the bottom and partially filled with water. The ratio of the length of the horizontal section to the effective wetted length of a TLCD considered as another important parameter is also presented for investigation. A simple pendulum-like model test is conducted to simulate a long-period motion in order to prove the effectiveness of TLCD for vibrational control. Comparisons of the experimental and analytic results of the TLCD, TLD (tuned-liquid damper), and TMD (tuned-mass damper) are included for discussion.

Mutual intercropping-inspired co-silanization to graft well-oriented organosilane as adhesion promotion nanolayer for flexible conductors

Yi-Hsuan Chen,Yi-Hsiang Lai,Ping-Heng Wu,Li-Syuan Chen,Yung-Sen Lin,Chih-Ming Chen 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-

Surface metallization of polymer substrate andfilm adhesion are crucial to the development offlexibleelectronics. This study demonstrates the co-silanization engineering on the polyimide (PI)film by mutualintercropping of two organosilane molecules to improve their grafting orientability and enhance theadsorbability toward the PI substrate and loaded metal atoms. The mutual intercropping-inspired cosilanizationengineering is implemented by using 3-[(trimethylsilyl)ethynyl]pyridine (TEP) as asupporting organosilane to spatially confine the grafting orientation of the supported aminosilane, 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane (ETAS), leading to the formation of a wellorientedorganosilane composite nanolayer as adhesion promotion layer forflexible conductors. Theflexible Cu conductor electrolessly deposited on the PIfilm by co-silanization shows improved adhesionstrength (0.9 kgf/cm) compared to those based on mono-silanization (0.51 kgf/cm) and sputtered Ta/Cu(0.4 kgf/cm). Superior deformability (bendability) was also achieved for the co-silanized Cu/PI sample byretaining good electrical property after bending cycle up to 1000.

Effect of Processing Methods and Extraction Methods on Phenolic Contents of Guava (Psidium guajava L.) Leaves

Yu-Hsiang Hung,Cheng-Yung Cheng,Iou-Zen Chen 한국원예학회 2008 한국원예학회 기타간행물 Vol.- No.-

Droplet routing in high-level synthesis of configurable digital microfluidic biochips based on microelectrode dot array architecture

Zhongkai Chen,Daniel Hsiang-Yung Teng,Gary Chung-Jhih Wang,Shih-Kang Fan 한국바이오칩학회 2011 BioChip Journal Vol.5 No.4

Droplet-based digital microfluidic lab-onchips exploiting electrowetting-on-dielectric (EWOD) have been studied over the last decade. With the recent introduction of new highly scalable, reconfigurable and field-programmable microelectrode dot array (MEDA) architecture, there is a compelling need for a new digital microfluidics synthesizer for the new MEDA architecture. Droplet routing is a critical part of the digital microfluidics synthesizer. This paper presents a routing algorithm and the associated performance analysis results. The algorithm is able to route different sizes of reagent and sample droplets simultaneously and also incorporates other characteristics such as diagonal movements and channel-based movements that are specific to the MEDA architecture.

Exchange Coupling in FePt/Os/FePt Trilayers

Shih-Yuan Chen,Yeong-Der Yao,Yung-Hsiang Teng,Chin-Chung Yu 한국자기학회 2008 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-

Efficiency and Risk in Commercial Banks – Hybrid DEA Estimation

Mu-Jen Chen,Yung-Ho Chiu,Chyanlong Jan,Yu-Chuan Chen,Hsiang-Hsi Liu 연세대학교 동서문제연구원 2015 Global economic review Vol.44 No.3

The hybrid DEA model can solve the difference between radial inputs and non-radial inputs and evaluate efficiency. This is a pioneering study that uses the hybrid DEA model, evaluating the proportionate inputs with a radial measure and the non-proportionate inputs with a non-radial measure, in order to examine the impact of non-performing loans (NPLs) on the efficiency of Taiwan’s banking sector from 2006 to 2010. In summary, this research demonstrates the following: (1) Only nine banks remained in the top efficiency list during these years: China Development Industrial Bank, Mega International Commercial Bank, Chinatrust Commercial Bank, Cathay United Bank, Bank of Kaohsiung, Industrial Bank of Taiwan, Taiwan Cooperative Bank, Land Bank, and Bank of Taiwan. (2) Risk is an important factor that should be taken into consideration when evaluating banking efficiency. (3) From the hybrid DEA model, we find that most of the inefficient banks have an inefficiency factor caused primarily by too many NPLs (risk). (4) The efficiency of Taiwan’s large-scale banks is significantly better than the small-scale bank. By looking at the inefficiency index, the largescale bank’s inefficiency is caused by NPLs. For the small-scale bank, both radial variables and non-radial variables have equal importance in improving its efficiency.

Predatory efficacy of Orius strigicollis (Hemiptera: Anthocoridae) against Tetranychus urticae (Acarina: Tetranychidae) on strawberry

Shu-Jen Tuan,Yung-Hsiang Lin,Shu-Chen Peng,Wei-Han Lai 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.1

In this study, the predatory efficacy of Orius strigicollis (Poppius), a predacious flower bug, against the twospotted spider mite (TSSM), Tetranychus urticae Koch, on strawberry (Fragaria ananassa) was investigated. Our results showed that release of 2, 4, 6, and 12 neonates of O. strigicollis per strawberry plant could suppress 58.9, 72.6, 88.6, and 92.8% of T. urticae, respectively, at 14 days after treatment. A single release of 12 neonate bugs per plant achieved and maintained, over a period of 3 months, 82% to 98% control of T. urticae population. A biweekly release of 6 neonate bugs per plant; likewise, suppressed ca. 90% of T. urticae population throughout the same period. However, predatory efficacy was reduced by an over-release of predators which may cause cannibalism as well as lower possibility of finding prey. Since the released neonates survived well to adults with offspring that retained their predatory ability, this study has demonstrated that O. strigicollis is a predatorwith good potential for sustainable suppression of T. urticae on strawberry, and one application of O. strigicollis neonates at a predator:prey ratio of 1:200 egg plus motile TSSM or 1:60 motiles per strawberry plant promises a season-long control and substantial management of spider mite infestation.