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Shunjie Yu,Hongjuan Zhang,Liujun Pei,Shuaitong Liang,Aixue Dong,Jiping Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.2
Decamethylcyclopentasiloxane (D5) has attracted an increasing attention because it can realize waterless dyeing ofchemical fibers. In this paper, two azo disperse dyes with different substituents were synthesized, and compared with C.I. Disperse Red 73 to study the relationship between structure and dyeing properties systematically in D5 media. The resultsshowed that the dyeing uptake of dyes increased from 85.5 % to 98.0 % with the substituent changing from N-ethyl to Nacetoxyethylgroup. This was because the solubility of dyes in D5 media showed an evident reduction. Although the dyescontaining N-cyanoethyl group had the lowest solubility, the dyeing uptake became 93.4 %, which was slight lower than thatof dyes with N-acetoxyethyl group. This was because an introduction of N-cyanoethyl group increased dye molecularaggregation in D5 media, making it difficult to diffuse. Additionally, the dyes with N-ethyl or N-acetoxyethyl groups showedbetter washing fastness and rubbing fastness than that of dye containing N-cyanoethyl group. These results provide apotential theoretical guidance for improving exhaustion of disperse dyes in waterless dyeing system. This study will promotetextile industry sustainable development.
Optimization-Based Collision Avoidance in Multi-Car Elevator Systems
Shunji Tanaka,Masashi Watanabe 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
An elevator system such that more than one car is installed in each elevator shaft is called a multi-car elevator system. This study proposes a method to avoid collisions between cars in a multi-car elevator system. In this method collision avoidance is treated as a dynamic optimization problem to determine which floor each car should visit next under the constraint that collisions never occur. The effectiveness of the proposed method is examined by computer simulations.
Soft Power Suit for Knee Motion Assistance
Shunji MOROMUGI,Yasuhiro KOUJINA,Shogo ARIKI,Takayuki TANAKA,Maria Q,FENG,Takakazu ISHIMATSU 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2003 International Journal of Assistive Robotics and Me Vol.4 No.4
A wearable device is proposed and developed in order to provide comfortable human motion assistance. Unlike the conventional power amplifying devices, the ultimate goal of "soft power suit" which is proposed in this study is to achieve comfortable assistance only at target parts of the body with relatively light assisting power rather than high power amplification. In this paper a pair of soft power suits for knee motion assistance is proposed. The proposed soft power suits are composed of exoskeletons, sensors, actuators and a controller. Four pneumatic artificial muscles are used to actuate the soft power suit for each leg. They are controlled based on the information about muscle activity obtained from innovative muscle stiffness sensors developed by authors. The effectiveness of the developed soft power suits is evaluated through two experiments. One is to evaluate the effectiveness of the soft power suit in enhancing operator"s strength, and the other one is to evaluate the effectiveness in reducing fatigue during repetitive knee joint exercise. It was verified that the soft power suit reinforces operator"s strength and reduces fatigue.
Improvement of Youla Parameterization by Coefficient Diagram Method
Shunji Manabe 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The parameterization of all stabilizing control laws, through Youla parameterization, is a widely accepted concept in control design. However, when it is applied to the specific design, it is not effective because of the lack of rules of parameter selection. Generally speaking there are two sources which make the system unrobust, one comes from improper selection of the denominator of sensitivity and complementary sensitivity functions (characteristic polynomial) and other comes from that of the numerator. The Coefficient Diagram Method can give most robust characteristic polynomial for given performance and design limitations. Free parameters can be assigned to the desired numerator terms of the sensitivity and complementary sensitivity functions. In this way, Youla parameterization becomes the effective design tool.
A tendon-driven glove to restore finger function for disabled
Shunji Moromugi,Kousuke Kawakami,Katsutoshi Nakamura,Taichi Sakamoto,Takakazu Ishimatsu 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
An innovative glove system actuated by electric motors has been developed to restore finger functions for disabled people. This glove system is composed of a leather glove having external tendons built-in, an actuation unit and a sensor to detect user"s intentions for finger operations. Fingers are operated by actuation of the thin tendons made of polyethylene. The driving force of the tendon is transferred to the glove from the actuation unit by using bowden cables. It was demonstrated that the glove system can drive user’"s paralyzed fingers. The details of the system and results of the evaluation experiments are reported in this paper.
Treatment apparatus employing air-bag actuation for sleep apnea syndrome
Shunji Moromugi,Takao Ayuse,Taichi Sakamoto,Yusuke Tomimatsu,Takakazu Ishimatsu 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
A new treatment apparatus for Sleep Apnea Syndrome (SAS) has been proposed. Objective Sleep Apnea (OSA) is the most common case of the SAS. Airway of OSA patient is frequently obstructed during sleep because of tongue swallowing. This apparatus is composed of a pneumatically actuated flexible vest and a controller including an air pressure control unit. The flexible vest has sensors to detect airway obstructions and two airbags to conduct head tilt ?hin lift maneuvers that are needed for airway establishment. It was demonstrated that the proposed treatment apparatus successfully detects the airway obstruction and automatically establish the airway by conducting the chin lift-head tilt maneuvers.
( Shunji Ohara ),( Kenji Furuta ),( Kyoichi Adachi ),( Kousuke Fukazawa ),( Masahito Aimi ),( Masaharu Miki ),( Yoshikazu Kinoshita ) 대한소화기기능성질환·운동학회 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.4
Background/Aims The sensitivity of the upper and lower esophageal mucosa to acid is considered to differ. We investigated the relationship between pH changes in different sites of the esophagus and generation of gastroesophageal reflux symptoms during an acid infusion test. Methods An acid infusion catheter was placed at 5 or 15 cm above the lower esophageal sphincter (LES) in 18 healthy volunteers, while a 2-channel pH sensor catheter was also placed in each with the sensors set at 5 and 15 cm above the LES. Solutions containing water and hydrochloric acid at different concentrations were infused through the infusion catheter. Results Acid infusion in the upper esophagus caused a pH drop in both upper and lower esophageal sites, whereas that in the lower esophagus resulted in a significant pH drop only in the lower without a corresponding pH decline in the upper esophagus. Stronger heartburn, chest pain, and chest oppression symptoms were noted when acid was infused in the upper as compared to the lower esophagus, while increased intra-esophageal acidity strengthened each symptom. Regurgitations caused by upper and lower esophageal acid infusions were similar, and not worsened by a larger drop in intra-esophageal pH. Chest pain was caused only by lowered intra-esophageal pH, while heartburn, chest oppression, and regurgitation were induced by a less acidic solution. Conclusions Higher intra-esophageal acidity caused stronger heartburn, chest pain, and chest oppression symptoms. However, regurgitation was not significantly influenced by intra-esophageal acidity. The upper esophagus showed higher acid sensitivity than the lower esophagus. (J Neurogastroenterol Motil 2013;19:503-508)