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Kawakami Yasuko,Yamazaki Kazuo,Ohashi Kazunori,Nakahama Naoyuki 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.4
Many ladybird species are known to have an elytral colour polymorphism, which indicates geographical vari ation. The ladybird beetle Cheilomenes sexmaculata (Fabricius) exhibits elytral colour polymorphism and has expanded its distribution from 33 ◦ N to 36 ◦ N in Japan over 100 years since 1900. The mitochondrial COI gene haplotypes were integrated into two haplotype groups, with one group existing at higher frequencies in lower latitudes, the other group appearing at higher frequencies in higher latitudes. In addition, the dark morph types of this species increase with latitude, whereas the light types appear at higher relative frequencies in lower latitudes. In the present study, we first determined the morph types of individuals and examined the mitochondrial DNA COI gene. Second, we investigated the relationship between the genetic population structure based on the mitochondrial DNA COI gene and the morph types’ geographical variation. Results indicated that the mtCOI genetic structure was associated with the morph types by latitude; specifically, the haplotype group existing at higher frequencies in lower latitudes tended to be light morph types. In contrast, the haplotype dominant in higher latitudes more frequently exhibited dark morph types, indicating that dark morph types in the higher latitude genetic group may have led the distributional expansion toward higher latitudes since 1900 rather than the lower latitude light morph types.
Yasuko Kawakami,Kazuo Yamazaki,Kazunori Ohashi 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2
The ladybird beetle, Menochilus sexmaculatus (Fabricius), has a remarkable elytral colour polymorphism composed of black and red. In the present study, we investigated the effect of temperature on growth from the first instar larva to the pupal stage, as well as maternal morph types on the phenotypic expression of the elytral colour morph in a polymorphic population from Osaka, Japan. Female individuals of three different elytral colour morphs were collected from a wild population, and hatchlings from each female were divided into three groups, which were reared at three constant temperatures: 20 °C, 25 °C, and 30 °C. The phenotypic frequency of F1 adults indicated that the elytral morph type was determined by genetic factors, but not by growth temperatures. Namely, type A (almost black morph) was the most abundant in F1 from type A mothers (Male: 52.6%; Female: 32.3%); and types B (four small-dotted morph) and F (four medium-dotted morph) were the most abundant from type B (Male: 56.7%; Female: 53.3%) and type G (four larger-dotted morph) mothers (Male: 33.3%; Female: 31.3%), respectively. Therefore, the expression of elytral colour polymorphism in the Osaka, Japan population is likely to have a genetic basis contingent on parental morphs, rather than a phenotypic plasticity associated with growth temperatures
Improvement of Knee Flexion and Extension Simulation Accuracy in KneeRobo
Qichang Qi,Yoshie Maeda,Kazunori Yamazaki,Noritaka Sato,Yoshifumi Morita,Hiroyuki Ukai,Kouji Sanaka 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
In a previous paper, we reported on the initial development of KneeRobo, which replicates knee joint troubles experienced by patients in order to enable students studying to become physical or occupational therapists to gain practical training/testing virtually. We also developed a control algorithm that enabled KneeRobo to realize involuntary internal/external rotation during knee flexion and extension. However, it is well known that in addition to internal/external rotation, abduction/adduction also occurs involuntarily during knee flexion and extension. Consequently, this paper proposes a new control method that improves the simulation accuracy of KneeRobo’s knee joint movements. This is accomplished by developing a control algorithm and designing a pulley arrangement that facilitates realization of involuntary movements such as internal/external rotation and abduction/adduction during knee flexion and extension by KneeRobo. The results of experimental comparison with the actual knee joint movements of a healthy person confirm that the knee joint movements simulated by the improved KneeRobo are accurate.
Evaluation of Simplified Repeated Resistance Training System for Severe Hemiplegic Stroke Patient
Michito Yasukita,Yuki Iida,Kazunori Yamazaki,Noritaka Sato,Yoshifumi Morita,Hiroyuki Ukai,Yoshiaki Takagi,Yoshitaka Aoki,Hirofumi Tanabe,Rumi Tanemura 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
We have developed a three-dimensional force display robot (3D robot) to discover and embody needs in rehabilitation site. Then we have exchanged opinions with therapists by using the 3D robot together in rehabilitation site. From a therapist" needs we have developed repeated resistance training system by using the 3D robot as one of the application of the 3D robot. On the basis of the results we have developed a simplified repeated resistance training system equipped with a user interface for easy operation for therapists. Moreover, we have developed a brace for fixation as the attachment between the training system and the patient’s arm. In this paper, we perform the functional evaluation of the simplified repeated resistance training system and the brace in the clinical site. These results are based on the opinions from the therapist and the patient. Moreover, we verify the therapeutic effects of the repeated resistance training using the simplified system for a hemiplegic stroke patient. The AROMs of pronation and supination of the patient were improved after repeated resistance training using the simplified system.
Dynamic Memory Access Control for Accelerating FPGA-based Image Processing
Kenta Nishiguchi,Toshiyuki Inoue,Rei Yamazaki,Kazunori Ogohara,Akira Tsuchiya,Keiji Kishine 대한전자공학회 2021 Journal of semiconductor technology and science Vol.21 No.1
In an FPGA-based image processing system, memory access plays an important role in increasing the speed of image processing. With the conventional method, the memory access interval for image processing was fixed, which limited the processing speed. In this work, we developed a novel memory access method that dynamically controls the intervals between memory access requests for image processing by monitoring the memory status. We implemented an image processing system with the proposed method and examined its characteristics. The maximum processing speed with the proposed method reached 30.7 fps, which was 1.65 times faster than that of the conventional method.
Ayaka Yamada,Eishi Nakamura,Noritaka Sato,Yoshifumi Morita,Tadashi Ito,Yoshihito Sakai,Kazunori Yamazaki 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
The goal of our work was to develop a treatment system for restoring proprioception in patients experiencing low back pain and those who experience falls. For this purpose, we investigated postural sway during local vibratory stimulation in elderly people in the standing position by using our newly developed variable frequency vibratory stimulation device and a gravicorder. Vibratory stimulations of 30, 60, 150, or 240 Hz were applied to the patients’ lumbar multifidus (LM) or gastrocnemius soleus muscles (GM). These frequencies were determined from eigen response frequencies for proprioception. The eigen response frequencies for the Meissner corpuscle, muscle spindle, and the Vater-Pacini corpuscles were 30, 60, and 240 Hz, respectively. The relative proprioceptive weighting ratios at 30 and 240 Hz were significantly different between elderly patients with and those without low back pain. On the other hand, the relative difference of center of pressure length of the LM at 30 Hz was significantly different between elderly patients with and those without a history of falls. Therefore, the Meissner and Vater-Pacini corpuscles may be deteriorated in patients with low back pain. The Meissner corpuscle in the lumbar region may be deteriorated in those who experience falls.