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Consistency of the Optimized Bandwidth in Filter-based Fatigue Index
Kim, Jungyoon,Son, Jongsang,Kim, Youngho Korean Society for Precision Engineering 2014 International Journal of Precision Engineering and Vol.15 No.11
In this study, we evaluated the cut-off frequency of the filter-based fatigue index using surface electromyography (EMG) signals from different upper and lower extremity muscles under different exercise conditions. Twenty seven subjects participated in isotonic knee extension exercises, fourteen subjects in isotonic elbow flexion and isokinetic knee extension exercises, and twenty subjects in isometric knee extension, isotonic ankle dorsiflexion, and isotonic elbow extension exercises. EMG signals were obtained from right rectus femoris (RF), vastus medialis (VM), vastus lateralis (VL), biceps brachii (BB), triceps brachii (TC), and tibialis anterior (TA) muscles during exercises. The filter-based fatigue index was compared with sEMG-based fatigue indices such as mean root-mean-square (RMS) values, median frequency, Dimitrov spectral index, and Gonzalez-Izal wavelet index. Results showed that optimized cut-off values for all muscles and all exercises approximated to 350 Hz. This implies that the cut-off frequency of 350 Hz is appropriate for general use, showing better determination coefficient with biomechanical fatigues such as joint torques and powers than the other fatigue indices in different muscles during different exercises.
유종상(Jongsang Yoo),유준규(Joon-Gyu Ryu),김판수(Pansoo Kim),임경래(Gyeongrae Im),정동현(Jung-Dong Hyun),김중빈(Jung-Bin Kim) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문은 시장 조사 & 컨설팅 전문기업인 6Wresearch의 ‘글로벌 5G 통신위성 시장 (2022-2027)’[1] 보고서를 바탕으로 세계 5G/6G 위성 시장 동향분석과 시장 성장요인을 소개한다. 시장 분석은 ‘아시아-태평양’, ‘미주’, ‘유럽, 중동, 아프리카’ 지역으로 분류하여 분석을 진행하였다. 이후, 해당 지역시장 내에서의 주요국가들에 대한 시장 동향분석을 개별적으로 진행하였다. 이를 통해 지역시장 공통된 수요와 해당 지역시장 견인요소를 도출하고 소개한다.
김현숙(Hyeonsuk Kim),김소윤(Soyun Kim),이종상(Jongsang Lee) 한국농촌지도학회 2016 농촌지도와 개발 Vol.23 No.3
The increase in demand for leisure time by the public and the vitalization of agricultural tourism resulting from the expansion of the five-day work week are expected to greatly contribute to the rural economy, but actual studies analyzing the ripple effect of the agricultural tourism industry are lacking. In order to analyze the economic ripple effect, tourism or agricultural tourism must become an independent sector in the inter-industry relations table’s sector classification, but because it is not, the study uses a method of analysis which involves creating a satellite account. However, because agricultural tourism has a clear main agent in farms unlike general tourism which does not, there is one method in which provisions are made by farms or farm villages and another method in which outside products are used. The purpose of the present is to measure the economic ripple effect of agricultural tourism with a focus on 162 subclasses by applying positive data from the education sector input into agricultural tourism. Satellite accounts which considered intermediate input were created and applied to positive data, the analysis of which revealed agricultural tourism to account for 462 billion won, which is 0.01% of the total production amount of 3,503,480 billion won, while the production inducement coefficient was 3.2895 units when the final demand of agricultural tourism occurs. When the production inducement coefficient is at 3.2895 units, highest sector was agricultural tourism at 0.9968 units followed by restaurants and bars at 0.3325 units, roadt transportation services at 0.3183 units, lodging services at 0.1520 units, and petroleum products at 0.1290 units.
김현동(Hyun Dong Kim),손종상(Jongsang Son),김한성(Han Sung Kim),김영호(Youngho Kim),임도형(Dohyung Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The trunk is inclined to the loaded side when carrying an object as one of activities of daily living. As the reaction to this behavior the human body may be inclined to his/her trunk to unloaded side. The present study investigated the biomechanical effects of weight variation for sided load carriage during walking upon joint moments and muscle torques, through the tracker agent and joint driving dynamic analysis. To perform the experiment one male was selected as subject for the study. Gait analysis was performed by using a 3D motion analysis system. Thirty nine 14㎜ reflective markers, according to the plug-in marker set, were attached to the subject. We used BRG.LifeMOD(Biomechanics Research Group, Inc., USA), for skeletal modeling and inverse and joint driving dynamic simulation during one gait cycle. In walking with a sided load carriage, the subject modeled held the carriage with the right hand, which weighed 0, 5, 10, 15㎏, 20㎏ respectively. The result of this simulation showed that knee and hip in the coronal plane were inclined to the loaded side and loaded side had larger moments as the sided load carriage was increased. On the other hand thoracic and lumbar in the coronal plane had larger negative values as the sided loaded carriage was increased. The thoracic and lumbar in the transverse plane also had larger values as the sided load was increased. And the several muscles of loaded side were increased as increasing sided load. It could be concluded that human body is adopted to side loaded circumstances by showing more biologic force. These results could be very useful in analysis for delivery motion of daily life.
노인의 팔 굽힘/폄 저항 운동 시 하중 증가에 따른 근육의 활성도 및 기여도 분석
김현동(Hyun Dong Kim),황성재(Sungjae Hwang),손종상(Jongsang Son),김한성(Han Sung Kim),김영호(Young Ho Kim) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.4
The purpose of this study was to assess activation and contribution of muscles of the elderly according to increased loading during the arm flexion extension resistance exercise. Surface electromyographic signals were acquired from biceps brachii, triceps brachii, deltoid posterior, pectoralis major and latissimmus dorsi to determine the difference of the activation of specific muscles between the elderly and young. Five elderly and five young males with no musculoskeletal disease volunteered for the study. Electromyographic activities in the muscles were measured during resistance exercise and normalized to the maximum EMG activity recorded in the maximal voluntary static contraction (MVC). Against the increased loading during arm flexion/extension resistance exercises, the young uses muscles evenly but the elderly uses one specific muscle frequently. Contribution of triceps brachii during extension and deltoid posterior during flexion was principal in the elderly.
Ryu, Jeseong,Son, Jongsang,Kim, Sungjoong,Kim, Jongman,Ahn, Soonjae,Kim, Youngho Korean Society for Precision Engineering 2018 International Journal of Precision Engineering and Vol.19 No.4
A newly designed standing wheelchair that moves even while standing posture has been developed to improve the health and the quality of life for wheelchair users. However, this standing wheelchair has hand rims separate from the wheels, likely affecting the biomechanical characteristics and the efficiency of propulsion. Thus, this study aimed to propose a method to determine the optimal riding position by evaluating muscle activation during manual standing wheelchair propulsion. Ten elderly male subjects were asked to propel the hand rims with nine different seat (while sitting) and footrest (while standing) positions. During the experiments, kinematic data were obtained using a 3D motion capture system and sEMG measurement system, respectively. Simultaneously, surface electromyography signals were recorded from eleven muscles on the right side of the trunk and the upper extremity to evaluate relative iEMG and muscle co-contraction ratio. The muscle co-contraction ratio was higher at positions (upward and backward directions) distant from the hand rim and lower at positions (downward and forward directions) close to the hand rim. These results indicate that decreased distance from the hand rim enhances joint stability and decreases muscle co-contraction. These results also showed a good similarity with our previous study using energy expenditure method.
( Seonju Jeong ),( Jiyeong Park ),( Jaeyong Lee ),( Kangwook Lee ),( Kyeman Cho ),( Gyoungmin Kim ),( Junghye Shin ),( Jongsang Kim ),( Jeonghwan Kim ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.11
Fibrinolytic enzyme genes (aprE2, aprE176, and aprE179) were introduced into the Bacillus subtilis 168 chromosome without any antibiotic resistance gene. An integration vector, pDG1662, was used to deliver the genes into the amyE site of B. subtilis 168. Integrants, SJ3-5nc, SJ176nc, and SJ179nc, were obtained after two successive homologous recombinations. The integration of each fibrinolytic gene into the middle of the amyE site was confirmed by phenotypes (Amy-, SpecS) and colony PCR results for these strains. The fibrinolytic activities of the integrants were higher than that of B. subtilis 168 by at least 3.2-fold when grown in LB broth. Cheonggukjang was prepared by inoculating each of B. subtilis 168, SJ3-5nc, SJ176nc, and SJ179nc, and the fibrinolytic activity of cheonggukjang was 4.6 ± 0.7, 10.8 ± 0.9, 7.0 ± 0.6, and 8.0 ± 0.2 (U/g of cheonggukjang), respectively at 72 h. These results showed that construction of B. subtilis strains with enhanced fibrinolytic activities is possible by integration of a strong fibrinolytic gene via a marker-free manner.