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Kaoru Yamashita,Akira Tsuchitani,Hideyuki Murakami,Masanori Okuyama,Shigeru Arita,Tsunehisa Tanaka,Yaowu Mo,Yoshihiko Suzuki 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Arrayed ultrasonic microsensors using piezoelectric PZT (Pb(Zr,Ti)O3) thin lms on micromachined silicon diaphragms have been fabricated and combined with BBD (Backet Brigade Device) for signal processing. The ultrasonic sensors are designed to compose an electrical phased array for three-dimensional object detection in air. The resonant frequencies of the elements were scattered in the error range of 12 % and the objects could not be detected due to the beat in the sum of delayed element waveforms. Each element has been tuned by adequate poling less than 10 V to make its resonant frequency equal to a center value. The frequency scattering was reduced within the range of 2 % and the tuned array could give the objects by summing up of the delayed signals. Three-dimensional object detection has been demonstrated using the tuned sensor combined with the BBD delay circuit.4
Effect of arrangement of design elements on recognition of complex signs
Maki Ishihara,Akira Okada,Kuniko Yamashita 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-
Due to the expansion of cities and the increasing number of large-scale and complex public spaces, there is an increase in public signage. Moreover, the information described on these signs tends to be diverse and complicated. Complex signs that contain multiple destinations or other information must be considered to determine not only the proper size, color, etc. but also the most effective arrangement of design elements. In the previous research, the cognitive utility of complex public signs was estimated using computer simulation software. In the current research, we focused on the objective estimation of the effectiveness of the results obtained in the previous research utilizing an eye mark recording system. Two cognitive engineering experiments clarified five points for improvement in the usability of complex signs, as follows: 1) Parallel construction of characters and pictograms is more efficient. 2) Grouping elements result in rapid recognition of information chunks. 3) Visual characters and pictograms are effective, along with proper density of information. 4) Specific arrangement of sign arrows is effective. 5) Figures on signs influence the sequence of information searches.
Effect of Arrangement of Design Elements on Recognition of Complex Signs
Maki Ishihara,Akira Okada,Kuniko Yamashita 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.4
Due to the expansion of cities and the increasing number of large-scale and complex public spaces, there is an increase in public signage. Moreover, the information described on these signs tends to be diverse and complicated. Complex signs that contain multiple destinations or other information must be considered to determine not only the proper size, color, etc. but also the most effective arrangement of design elements. In the previous research, the cognitive utility of complex public signs was estimated using computer simulation software. In the current research, we focused on the objective estimation of the effectiveness of the results obtained in the previous research utilizing an eye mark recording system. Two cognitive engineering experiments clarified five points for improvement in the usability of complex signs, as follows: 1) Parallel construction of characters and pictograms is more efficient. 2) Grouping elements result in rapid recognition of information chunks. 3) Visual characters and pictograms are effective, along with proper density of information. 4) Specific arrangement of sign arrows is effective. 5) Figures on signs influence the sequence of information searches.
Kohno, Shohei,Yamashita, Yui,Abe, Tomoki,Hirasaka, Katsuya,Oarada, Motoko,Ohno, Ayako,Teshima-Kondo, Shigetada,Higashibata, Akira,Choi, Inho,Mills, Edward M.,Okumura, Yuushi,Terao, Junji,Nikawa, Takes American Physiological Society 2012 environmental and exercise physiology Vol.112 No.10
<P>Skeletal muscle is one of the most sensitive tissues to mechanical loading, and unloading inhibits the regeneration potential of skeletal muscle after injury. This study was designed to elucidate the specific effects of unloading stress on the function of immunocytes during muscle regeneration after injury. We examined immunocyte infiltration and muscle regeneration in cardiotoxin (CTX)-injected soleus muscles of tail-suspended (TS) mice. In CTX-injected TS mice, the cross-sectional area of regenerating myofibers was smaller than that of weight-bearing (WB) mice, indicating that unloading delays muscle regeneration following CTX-induced skeletal muscle damage. Delayed infiltration of macrophages into the injured skeletal muscle was observed in CTX-injected TS mice. Neutrophils and macrophages in CTX-injected TS muscle were presented over a longer period at the injury sites compared with those in CTX-injected WB muscle. Disturbance of activation and differentiation of satellite cells was also observed in CTX-injected TS mice. Further analysis showed that the macrophages in soleus muscles were mainly Ly-6C-positive proinflammatory macrophages, with high expression of tumor necrosis factor-α and interleukin-1β, indicating that unloading causes preferential accumulation and persistence of proinflammatory macrophages in the injured muscle. The phagocytic and myotube formation properties of macrophages from CTX-injected TS skeletal muscle were suppressed compared with those from CTX-injected WB skeletal muscle. We concluded that the disturbed muscle regeneration under unloading is due to impaired macrophage function, inhibition of satellite cell activation, and their cooperation.</P>
Control of an Artificial-Hip-Joint Simulator to Evaluate Dislocation
Kazuo Kiguchi,Akira Yamashita,Makoto Sasaki,Masaru Ueno,Tsuneyuki Kobayashi,Masaaki Mawatari,Takao Hotokebuchi 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Total hip arthroplasty (THA) is performed to replace all or part of a human hip joint with an artificial joint for patients who have rheumatoid arthritis or osteoarthritis of the hip joint. Although THA might result in postoperative complications of dislocation, wear and/or loose, their mechanisms have not been analyzed enough. We have developed an artificial-hip-joint simulator that can generate the same joint posture and joint contact force as those in daily life motion in order to evaluate the performance of the artificial-hip-joint. Dislocation of the artificial-hip-joint during daily living activities was generated by the simulator in order to analyze its mechanism.
Accurate Determination of Childhood Food Allergy Prevalence and Correction of Unnecessary Avoidance
Yuki Okada,Takumi Yamashita,Hideki Kumagai,Yoshihiko Morikawa,Akira Akasawa 대한천식알레르기학회 2017 Allergy, Asthma & Immunology Research Vol.9 No.4
Purpose: Because the true prevalence of food allergy (FA), as based on the results of an oral food challenge test (OFC), is unknown, it is likely that children with suspected FA unnecessarily eliminate potentially causative foods. This study aimed to identify the prevalence of FA and to determine the proportion of children who unnecessarily eliminate food. Methods: To identify children with FA, a primary survey was conducted via a questionnaire with all children aged 0-18 years in Niijima village (remote islands of Japan). In the secondary survey, a detailed medical interview was conducted by doctors with children who currently did not eat some foods. The third survey involved serum food-specific immunoglobulin E (IgE) tests and an OFC for children with suspected FA. Results: Of 376 enrolled children, 374 (99.5%) completed the questionnaire. Some foods were eliminated by 18.6% and 13.0% of all children and those ≥6 years old, respectively. The target population for the secondary survey included 69 children who all completed the medical interview. The target population for the third survey consisted of 35 children, of whom 26 (74.3%) underwent the blood test. An OFC was performed 35 times with 20 children. As a result, the prevalence of FA was 4.9% in children of all ages and 4.7% in those ≥6 years old. Moreover, 55.0% children were able to cease eliminating food intake. Conclusions: It is possible that a considerable number of children unnecessarily eliminate food because of suspected FA.
최홍석 ( Choi Hong-seok ),岡崎章 ( Okazaki Akira ),山下利之 ( Yamashita Toshiyuki ) 동의대학교 경제경영전략연구소 2012 經濟經營硏究 Vol.7 No.2
The importance of each factor which becomes the preference criterion of products is depended on each evaluator. However, depending on time, there is a possibility to be changed the ranking of factors, because the factors are based on sensibility. The study developed “rami” which is possible to express human vague sensibility in a freehand drawn figure, unlike several existing evaluation methods. By visualizing the importance of preference criterion factors of products by using “rami”, it was found that people were divided into two groups: one group has an obvious evaluation criterion and the other group does not have it when they evaluated a product. Moreover, it is possible for evaluators to be aware of the change of the evaluation method rankings themselves.
Takeshi Nishioka,Masaharu Fujino,Akihiro Homma,Tetsuro Yamashita,Akira Sato,Keiichi Ohmori,Kenichi Obinata,Hiroki Shirato,Kenichi Notani,Masamichi Nishio 연세대학교의과대학 2010 Yonsei medical journal Vol.51 No.4
Purpose: Deciding on treatment carcinoma of the tongue when the tumor has a thickness of 1.5 cm or more is difficult. Surgery often requires wide resection and re-construction, leading to considerable functional impairment. A cesium implant is an attractive option, but according to the Manchester System, a two plane implant is needed. Materials and Methods: According to the textbook, a tumor is sandwiched between the needles, which are implanted at the edge of the tumor. This may cause an unnecessarily high dose to the outer surface of the tongue,which sometimes leads to a persistent ulcer. To avoid this complication, we invented a modified implantation method, and applied the method to five consecutive patients. Results: With a minimum follow-up of 2 years, all primary tumors in 5consecutive patients have been controlled. No complications occurred in soft tissue of the tongue or in the mandible. Conclusion: Our modified Manchester System was feasible and effective for tumors that has a thickness of 1.5 cm or more.