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A knitted glove sensing system with compression strain for finger movements
Ryu, Hochung,Park, Sangki,Park, Jong-Jin,Bae, Jihyun IOP 2018 Smart materials & structures Vol.27 No.5
<P>Development of a fabric structure strain sensor has received considerable attention due to its broad application in healthcare monitoring and human–machine interfaces. In the knitted textile structure, it is critical to understand the surface structural deformation from a different body motion, inducing the electrical signal characteristics. Here, we report the electromechanical properties of the knitted glove sensing system focusing on the compressive strain behavior. Compared with the electrical response of the tensile strain, the compressive strain shows much higher sensitivity, stability, and linearity via different finger motions. Additionally, the sensor exhibits constant electrical properties after repeated cyclic tests and washing processes. The proposed knitted glove sensing system can be readily extended to a scalable and cost-effective production due to the use of a commercialized manufacturing system.</P>
Rotating Triboelectric Generator Using Sliding Contact and Noncontact from 1D Fiber Friction
Park, Sangki,Ryu, Hochung,Park, Seoungwoong,Hong, Hyeonbin,Jung, Ho Young,Park, Jong-Jin unknown 2017 Nano energy Vol.33 No.-
<P><B>Abstract</B></P> <P>We design a continuously rotating triboelectric nanogenerator (CR-TENG) to minimize the rotation resistance for a rotor operating at small wind speeds (~3.5 m/s), and to maximize the efficiency of sliding contact as a one-dimensional (1D) fiber rather than two-dimensional contact areas. The CR-TENG harvests electrical energy (21.6 V and 0.6 <I>μ</I>A) from a small wind with a speed of 3.5 m/s, which is easily generated in everyday life in spite of the small contact area (0.3 cm × 0.8 cm), which is due to the surface roughness and flexibility of the 1D fiber. Furthermore, a small-sized CR-TENG with a diameter of 2 cm can harvest electrical energy (5.1 V, 8.5 V, and 23.8 V, respectively) in artificial wind (10 m/s, 20 m/s, and 30 m/s) generated in a moving carrier, so a small-sized CR-TENG with improved mobility and highly integrated density may be realized.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We newly propose the use of rotating 1D fiber friction instead of rotating 2D friction of a previous rotating triboelectric generator. </LI> <LI> This is done to minimize the rotation resistance at small wind speeds (~3.5 m/s), which vary according to the attached fiber morphology on the rotor. </LI> <LI> Although the contact area is very small, the newly proposed rotating triboelectric generator can harvest electrical energy (21.6 V and 0.6 µA). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
LB30057 Inhibits Platelet Aggregation and Vascular Relaxation Induced by Thrombin
Byoung-InJung,Kyu-TaeKang,배옥남,Moo-YeolLee,Seung-MinChung,Sang-KooLee,In-ChulKim,Jin-HoChung 대한약학회 2002 Archives of Pharmacal Research Vol.25 No.6
Previous study showed that an amidrazonophenylalanine derivative, LB30057, which has high water solubility, inhibited the catalytic activity of thrombin potently by interaction with the active site of thrombin. In the current investigation, we examined whether LB30057 inhibited platelet aggregation and vascular relaxation induced by thrombin. Treatment with LB30057 to plateletrich plasma (PRP) isolated from human blood resulted in a concentration-dependent inhibition of thrombin-induced aggregation. Values for IC50 and IC100 were 54 ± 4 nM and 96 ± 3 nM, respectively. This inhibition was agonist (thrombin) specific, since IC50 values for collagen and ADP were much greater than those for thrombin. In addition, concentration-dependent inhibitory effects were observed on the serotonin secretion induced by thrombin in PRP. Consistent with these findings, thrombin-induced increase in cytosolic calcium levels was inhibited in a concentration-dependent manner. When LB30057 was treated with aortic rings isolated from rats, LB30057 resulted in a concentration-dependent inhibition of thrombin-induced vascular relaxation. All these results suggest that LB30057 is a potent inhibitor of platelet aggregation and blood vessel relaxation induced by thrombin.