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Anti-inflammatory Effect of Water-soluble Chitosan Oligosaccharideson Human Monocyte THP-1 Cells
( Que Thanh Thanh Nguyen ),( Thi Xoan Hoang ),( Jae Kweon Park ),( Jae Young Kim ) 한국키틴키토산학회 2020 한국키틴키토산학회지 Vol.25 No.3
The various functional properties of chitosan have been investigated for use in biomedical applications. Indeed, chitosan or its derivatives have shown anti-inflammatory effect by regulating a range of cytokines, chemokines or growth factors. In the present study, we prepared water-soluble chitosan oligosaccharide (AS-WSC) by the hydrolysis of high molecular weight water-soluble chitosan (HMW-WSC) and examined its anti-inflammatory effect on LPS-stimulated human monocytic THP-1 cells. Our results revealed that LPS-induced NF-κB activity of THP-1 cells was significantly suppressed by treatment with 0.02% AS-WSC. In addition, 0.02% AS-WSC treatment down-regulated the expression of Toll-like receptor 4 and inflammatory cytokines, such as IL-1β and TNF-α, but had no effect on IL-10 and IL-4 expression in LPS-stimulated THP-1 cells. Our results suggest that 0.02% AS-WSC can be considered as a promising anti-inflammatory agent.
Dual Coalescent Energy-Efficient Algorithm for Wireless Mesh Networks
Que, Ma. Victoria,Hwang, Won-Joo Korea Multimedia Society 2007 멀티미디어학회논문지 Vol.10 No.6
In this paper, we consider a group mobility model to formulate a clustering mechanism called Dual Coalescent Energy-Efficient Algorithm (DCEE) which is scalable, distributed and energy-efficient for wireless mesh network. The differences of the network nodes will be distinguished to exploit heterogeneity of the network. Furthermore, a topology control, that is, adjusting the transmission range to further reduce power consumption will be integrated with the cluster formation to improve network lifetime and connectivity. Along with network lifetime and power consumption, clusterhead changes will be measured as a performance metric to evaluate the. effectiveness and robustness of the algorithm.
Functionalization of PET fabric via silicone based organic–inorganic hybrid coating
Que Kong,Zhiguang Li,Zuoliang Zhang,Xuehong Ren 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
In this paper, silica dioxide nanoparticles (SiO2) were synthesized and functionalized with noctadecyltriethoxysilane(OD) through a modified Stöber method for the preparation of organic–inorganic hybrid micro-nanoparticles. Organic–inorganic hybrid micro-nanoparticles were applied ontothe polyester (PET) fabric via a conventional “dipping–drying” process for thefluoro-free water-repellenttextile materials. The coated PET fabric surface showed micro/nano-structures and exhibitedhydrophobic behavior with water contact angle of 141 . The surface morphologies, surface chemicalcomposition and contact angles of the coated fabrics surface were measured. Furthermore, the dynamichydrophobic behavior of water droplet impact on the fabric was investigated. By analyzing the energychange, D(t)/D0 value and H(t)/D0 value during water droplet impact were measured. The water dropletshowed an obvious effect of the dynamic rebound behavior on the coated fabric surface, furtherconfirming that the coated PET fabric had hydrophobicity. After the rubbing and washing durability,mechanical and chemical stability treatment, the coated PET fabrics still maintained high hydrophobicityand displayed good water-repellent durability. Last but not least, PET hydrophobic fabrics exhibitedexcellent self-cleaning properties with dyes on the fabric surface.
Effect of Wearing Ankle Weights on Underwater Treadmill Walking
( Que Tae Park ),( Suk Bum Kim ),( David O Sullivan ) 한국운동역학회 2019 한국운동역학회지 Vol.29 No.2
Objective: The main purpose of this study was to investigate the effects of wearing an ankle weight belt while performing gait in water by focusing on the effect of using ankle weights have on the gait kinematics and the muscle activities for developing optimum training strategies. Method: A total of 10 healthy male university students were recruited for the study. Each participant was instructed to perform 3 gait conditions; normal walking over ground, walking in water chest height, and walking in water chest height while using ankle weights. All walking conditions were set at control speed of 4 km/h ± 0.05 km/h. The depth of the swimming pool was at 1.3 m, approximately chest height. The motion capture data was recorded using 6 digital cameras and the EMG was recorded using waterproof Mini Wave. From the motion capture data, the following variables were calculated for analysis; double and single support phase (s), swing phase (s), step length (%height), step rate (m/s), ankle, knee, and hip joint angles (°). From the electromyography the %RVC of the lower limb muscles medial gastrocnemius, rectus femoris, erector spinae, semitendinosus, tibialis anterior, vastus lateralis oblique was calculated. Results: The results show significant differences between the gait time, and step length between the right and left leg. Additionally, the joint angular velocities and gait velocity were significantly affected by the water resistance. As expected, the use of the ankle weights increased all of the lower leg maximum muscle activities except for the lower back muscle. Conclusion: In conclusion, the ankle weights can be shown to stimulate more muscle activity during walking in chest height water and therefore, may be useful for rehabilitation purposes.
Yun Que,Cheng-cheng Long,Fu-Quan Chen 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8
In the area of high seismic intensity, there were few methods for calculating active earth pressure (Ea). Especially for the cantilever retaining wall with long relief shelf (CRW-LRS), the theoretical method lags behind the practical engineering. The seismic active earth pressure (Es) of the CRW-LRS subject to translational mode was researched. By finite element method (FEM), the failure mode of the active limit state under seismic load was evaluated. The results show that the backfill behind the wall generates the first sliding surface at the wall heel bottom, the second at the wall heel top, and the third at the relief shelf top. The calculation formula of Es under long relief shelf failure mode was proposed using the limit analysis method of a horizontal differential layer. The calculation results were compared with the FEM results to prove the rationality and reliability of the theoretical solution. The effects of relief shelf relative length (l) and position (m), wall heel length (n), internal frictional angle of the backfill (ϕ), seismic horizontal acceleration (ah), and seismic vertical acceleration (av) on Es were studied.
Moon-Que Lee,Han Lim Lee,Dong-Hoon Park 한국전자파학회JEES 2016 Journal of Electromagnetic Engineering and Science Vol.16 No.4
This letter proposes a reconfigurable directional coupler that uses a variable impedance mismatch reflector to achieve high isolation characteristics in the antenna front end. The reconfigurable coupler consists of a directional coupler and a single-pole four-throw (SP4T) switch with different load impedances as a variable load mismatch reflector. Selection of the load impedance by the reflector allows cancellation of the reflected signal due to antenna load mismatch and the leakage from the input to isolation port of the directional coupler, resulting in high isolation characteristics. The performance of the proposed architecture in separating the received (Rx) signal from the transmitted (Tx) signal in the antenna front end was verified by implementing and testing the reconfigurable coupler at 917 MHz for UHF radio-frequency identification (RFID) applications. The proposed reconfigurable directional coupler showed an improvement in the isolation characteristics of more than 20 dB at the operation frequency band.