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Comparison of Effects of Ultraviolet and $^{60}$ Co Gamma Ray Irradiation on Nylon 6 Mono-filaments
Ohtsuka, Mika,Suzuki, Yoshino,Sakai, Tetsuya,Netravali, Anil N. The Korean Fiber Society 2004 Fibers and polymers Vol.5 No.3
The effect of UV and $^60{Co}$ gamma radiations on the physical and mechanical properties of nylon 6 mono-filaments with different draw ratios has been studied. Specimens were exposed to either up to 25 Mrad of gamma or up to 168 hrs of intense UV irradiation. The results show that nylon mono-filaments exposed to gamma rays, with much higher quantum energy than UV, undergo a larger extent of molecular chain scission. Higher irradiation dose also results in the production of insoluble, macroscopic three-dimensional cross-linked network structure. The amorphous regions with a lower density of cohesive energy (lower molecular orientation) show a higher extent of cross linking reaction whereas amorphous regions with a higher density of cohesive energy (higher orientation) show higher extent of chain scission reaction, irrespective of UV ray or gamma ray irradiation.
Adaptive Collaborative Compensator Design Method for Human-Machine System
Hirofumi Ohtsuka,Koki Shibasato,Shigeyasu Kawaji 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The control performance of manual controlled human-machine system considerably depends on the skill level of human operator. So, authors have proposed a concept of “Collaborater” which coexists with human operator as a parallel control element and can collaboratively control the machine in order to modify the response of human-machine system. In this report, for the variety of human dynamics, an adaptive collaborater using Neural Network is considered.
Digital Creep Compensation Method for Load Cell in Various Loading Patterns
Akitsugu Ohtsuka,Tetsuya Koyama,Toru Kohashi,Motoyuki Adachi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a practical method of accurately compensating for the creep error in load cells through use of digital processing. The method employs a weighted composite function as a compensation function for use in flexibly expressing a creep error curve. In addition, a compensation model for calculating the amount of compensation that corresponds to the weight loading history is also proposed. The method can be used to perform accurate creep compensation without requiring any complex computing. Its effectiveness was revealed through processing a load cell output signal that included some creep error.
Magnetic resonance enterography for the evaluation of the deep small intestine in Crohn`s disease
( Kazuo Ohtsuka ),( Kento Takenaka ),( Yoshio Kitazume ),( Toshimitsu Fujii ),( Katsuyoshi Matsuoka ),( Masakazu Nagahori ),( Maiko Kimura ),( Takashi Nagaishi ),( Mamoru Watanabe ) 대한장연구학회 2016 Intestinal Research Vol.14 No.2
For the control of Crohn`s disease (CD) a thorough assessment of the small intestine is essential; several modalities may be utilized, with cross-sectional imaging being important. Magnetic resonance (MR) enterography, i.e., MRE is recommended as a modality with the highest accuracy for CD lesions. MRE and MR enteroclysis are the two methods performed following distension of the small intestine. MRE has sensitivity and specificity comparable to computed tomography enterography (CTE); although images obtained using MRE are less clear compared with CTE, MRE does not expose the patient to radiation and is superior for soft-tissue contrast. Furthermore, it can assess not only static but also dynamic and functional imaging and reveals signs of CD, such as abscess, comb sign, fat edema, fistula, lymph node enhancement, less motility, mucosal lesions, stricture, and wall enhancement. Several indices of inflammatory changes and intestinal damage have been proposed for objective evaluation. Recently, diffusion-weighted imaging has been proposed, which does not need bowel preparation and contrast enhancement. Comprehension of the characteristics of MRE and other modalities is important for better management of CD. (Intest Res 2016;14:120-126)