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Analysis of Finger Muscular Forces using a Wearable Hand Exoskeleton System
Kim, Suin,Lee, Jeongsoo,Bae, Joonbum Springer-Verlag 2017 JOURNAL OF BIONICS ENGINEERING Vol.14 No.4
<P>In this paper, the finger muscular forces were estimated and analyzed through the application of inverse dynamics-based static optimization, and a hand exoskeleton system was designed to pull the fingers and measure the dynamics of the hand. To solve the static optimization, a muscular model of the hand flexors was derived. The experimental protocol was devised to analyze finger flexors in order to evaluate spasticity of the clenched fingers; muscular forces were estimated while the flexed fingers were extended by the exoskeleton with external loads applied. To measure the finger joint angles, the hand exoskeleton system was designed using four-bar linkage structure and potentiometers. In addition, the external loads to the fingertips were generated by cable driven actuators and simultaneously measured by loadcells which were located at each phalanx. The experiments were performed with a normal person and the muscular forces estimation results were discussed with reference to the physical phenomena.</P>
Kim Min-Gul,Kim Suin,Jeon Ji-Young,Moon Seol Ju,Kwak Yong-Geun,Na Joo Young,Lee SeungHwan,Park Kyung-Mi,Kim Hyo-Jin,Lee Sang-Min,Choi Seo-Yeon,Shin Kwang-Hee 대한약리학회 2024 The Korean Journal of Physiology & Pharmacology Vol.28 No.2
This study aimed to identify metabolic biomarkers and investigate changes in intestinal microbiota in the feces of healthy participants following administration of Lactococcus lactis GEN-001. GEN-001 is a single-strain L. lactis strain isolated from the gut of a healthy human volunteer. The study was conducted as a parallel, randomized, phase 1, open design trial. Twenty healthy Korean males were divided into five groups according to the GEN-001 dosage and dietary control. Groups A, B, C, and D1 received 1, 3, 6, and 9 GEN-001 capsules (1 × 1011 colony forming units), respectively, without dietary adjustment, whereas group D2 received 9 GEN-001 capsules with dietary adjustment. All groups received a single dose. Fecal samples were collected 2 days before GEN-001 administration to 7 days after for untargeted metabolomics and gut microbial metagenomic analyses; blood samples were collected simultaneously for immunogenicity analysis. Levels of phenylalanine, tyrosine, cholic acid, deoxycholic acid, and tryptophan were significantly increased at 5–6 days after GEN-001 administration when compared with predose levels. Compared with predose, the relative abundance (%) of Parabacteroides and Alistipes significantly decreased, whereas that of Lactobacillus and Lactococcus increased; Lactobacillus and tryptophan levels were negatively correlated. A single administration of GEN-001 shifted the gut microbiota in healthy volunteers to a more balanced state as evidenced by an increased abundance of beneficial bacteria, including Lactobacillus, and higher levels of the metabolites that have immunogenic properties.
Kim, Suin,Ro, Kyongkwan,Bae, Joonbum Hindawi Limited 2017 Journal of sensors Vol.2017 No.-
<P>Although various kinds of methodologies have been suggested to estimate individual muscular forces, many of them require a costly measurement system accompanied by complex preprocessing and postprocessing procedures. In this research, a simple wearable sensor system was developed, combined with the inverse dynamics-based static optimization method. The suggested method can be set up easily and can immediately convert motion information into muscular forces. The proposed sensor system consisted of the four inertial measurement units (IMUs) and manually developed ground reaction force sensor to measure the joint angles and ground reaction forces, respectively. To verify performance, the measured data was compared with that of the camera-based motion capture system and a force plate. Based on the motion data, muscular efforts were estimated in the nine muscle groups in the lower extremity using the inverse dynamics-based static optimization. The estimated muscular forces were qualitatively analyzed in the perspective of gait functions and compared with the electromyography signal.</P>
Kim, Suin,Bae, Joonbum Institute of Electrical and Electronics Engineers 2017 IEEE/ASME Transactions on Mechatronics Vol. No.
<P>For a physical human-robot interaction (pHRI) system such as an exoskeleton, it has been an important issue to control the interaction force between the user and the actuators because it directly determines the accuracy of the realized impedance. However, the accurate force control of the exoskeleton system has not been fully achieved due to the difficulties caused by uncertainties from pHRI. To overcome this problem, in this study, the series elastic actuator (SEA) was operated by a time delay control (TDC), which directly compensated the uncertainties without an accurate model of them, realizing the designed model dynamics in the actuator. However, in spite of the successful application of TDC, the delays between the desired and model dynamics severely degraded the force control performance of the SEA. Thus, a new strategy named model-inverse time delay control was proposed by introducing a virtual reference predicted by the inverse of model dynamics in TDC. The proposed method significantly improved performance of the force control, and it was verified by demonstrating zero impedance control with pHRI, free oscillation of a pendulum, and force control in the exoskeleton.</P>
한식당 1인 상차림 속성이 식당이미지와 이용만족도에 미치는 영향
김수인 ( Suin Kim ),이슬 ( Seul Lee ),손다경 ( Dakyung Son ),도현욱 ( Hyunwook Do ) 관광경영학회 2020 관광경영연구 Vol.98 No.-
Recently, due to the globalization of Korean food and COVID-19, Korean food has become a form of eating separately rather than having a table that is shared by many people due to sanitary problems. This study was intended to find out about the impact of one-person table setting attributes in korean restaurant on restaurant image and user satisfaction. For this purpose of the study, 248 questionnaires were collected from customers visiting One-person table setting Korean restaurant and used for statistical analysis. In this study, a correlation analysis was conducted after securing conceptual validity and reliability. The results of the empirical analysis of this study are as follows. First, it turned out that one-person table setting attributes in korean restaurant had a partial positive effect on the restaurant image. Second, it was shown that one-person table setting attributes in korean restaurant had a positive effect on user satisfaction. Third, the restaurant image had a positive effect on user satisfaction. Fourth, in terms of the mediating effect of one-person table setting attributes in korean restaurant on user satisfaction, aesthetic image was found to partially reflect the effect of convenience, health and hygiene on user satisfaction of individual table setting attributes. Accordingly, this study is judged to present and be actively utilized as a tool for another differentiated marketing strategy in the ongoing competition for dining out.