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Development on Vehicle Guiding System with Three-Dimentional Laser Scanner
( Akitaka Otaki ),( Shoji Koide ),( Takahiro Orikasa ),( Hiroshi Shono ),( Jun-ichi Takeda ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In recent years, agricultural work is being automated and IT has been advanced in the field of agricultural machinery. The automatic steering apparatuses using GNSS and robot tractors are being developed. However, accurate GNSS is expensive and is difficult to acquire field conditions numerically. In this research, we developed a guidance system that acquires information on ridge line to extracts the target route of the vehicle using an inexpensive three-dimensional laser scanner compared to GNSS as a fundamental research of autonomous vehicle. In field experiments, a three-dimensional laser scanner with a depression angle was installed in front of the tractor, and the tractor was driven so as not to collapse the ridge installed in the field, and distance measurement data was acquired. By using the acquired distance measurement data, vertexes of the ridge were detected by self-made program, and approximate lines were obtained from these points to be the target trajectory. As a result, it was possible to obtain the target trajectory with sufficient accuracy to control the autonomous tractor.
Takayoshi Otaki,Masahiro Hamana,Hideaki Tanoe,Nobuyuki Miyazaki,Takuro Shibuno,Teruhisa Komatsu 한국해양과학기술원 2015 Ocean science journal Vol.50 No.2
Most demersal fishes maintain strong relations with bottom substrates and bottom depths and/or topography during their lives. It is important to know these relations to for understand their lives. In Tokyo Bay, red stingray, Dasyatis akajei, classified as near-threatened species by IUCN, has increased since the 1980s. It is a top predator and engages in ecosystem engineer by mixing the sand bed surface through burring behavior, and greatly influences a coastal ecosystem. It is reported that this species invades in plage and tidal flats and has sometimes injured beachgoers and people gathering clams in Tokyo bay. Thus, it is necessary to know its behavior and habitat use to avoid accidents and to better conserve the biodiversity of ecosystems. However, previous studies have not examined its relationship with the bottom environment. This study aims to describe its behavior in relation to the bottom environment. We sounded three dimensional bottom topography of their habitat off Kaneda Cove in Tokyo Bay with interferometric sidescan sonar system and traced the movement of red stingrays by attaching a data logger system to survey their migration. The results revealed that red stingray repeated vertical movement between the surface and bottom, and used not only sand beds but also rocky beds.
Yusuke Kurebayashi,Junichi Otaki 한국간호과학회 2021 한국간호과학회 학술대회 Vol.2021 No.10
Aim(s): Schizophrenia shows social impairment that is generally treated by psychopharmacotherapy. Recently, because therapy shows efficacy only for psychopathological symptoms, physical exercise for patients with schizophrenia is under development to improve cognition based on results from several studies. However, whether physical exercise improves social functioning remains unclear. Therefore, this study analyzed the cross-sectional correlation between physical activity and social functioning in inpatients with schizophrenia. Method(s): Inpatients with schizophrenia were recruited from a psychiatric hospital in Japan. We investigated demographics, psychopathological symptoms using the Positive and Negative Syndrome Scale (PANSS), physical activity using a tri-axial accelerometer HJA-750C, and social functioning using the Life Assessment Scale for the Mentally Ill (LASMI) and the Rehabilitation Evaluation Hall and Baker (Rehab). Lower LASMI and Rehab scores indicate better function. We performed Spearman’s rank-correlation analysis. Result(s): Seven inpatients completed to the survey. The average age, illness duration, and PANSS were 47.3 ± 13.8 years, 22.9 ± 13.7 years, and 78.6 ± 17.3, respectively. Walking calories were positively associated with the deviant behavior subscale (r= .926, p= .003) and the interpersonal relationship subscale (r= .786, p= .036). Walking time were also positively associated with the deviant behavior subscale (r= .926, p= .003) and the interpersonal relationship subscale (r= .786, p= .036). walking time more than 3 Mets (r= .926, p= .003) and steps (r= .849, p= .016) were positively associated with the deviant behavior subscale. Conclusion(s): Higher walking activity is associated with lower social functioning in this cross-sectional study. This cross-sectional relationship might be influenced by participants’ symptomatic severity. Patients who have severe symptom might tend to more move or walk and show severe social dysfunction especially on deviant behavior and interpersonal relationship. Therefore, future studies should examine the longitudinal association or the effect of the intervention. Furthermore, a large-scale study is also needed.
Sharon Mascarenhas,Manal Al-Halabi,Farah Otaki,Mohamed Nasaif,Dave Davis 한국의학교육학회 2021 Korean journal of medical education Vol.33 No.1
Purpose: The role of simulation-based education (SBE) in enhancing communication has been established in the literature. To ensure achieving desired outcomes from SBE initiative, the individual learners, their experiences, and environments need to be considered. This study aimed at exploring the perception of post-graduate dental students regarding their participation in SBE sessions, around selected communication skills, designed in alignment with the assumptions of adult learning theory and steps of Kolb’s experiential learning cycle. Methods: This study utilized a qualitative design. Six focus-group sessions were conducted following the SBE sessions. The generated data was inductively investigated using a multi-staged participant-focused approach to thematic analysis, based upon constructivist epistemology. NVivo was utilized to facilitate text Fragments’ coding and categorization. Results: Forty-three post-graduate dental students participated. The analysis resulted in 16 categories spread across five sequential phases of the SBE experience. The “input” theme referred to the resources needed for the SBE process, and included three categories: facilities, personnel, and teaching materials. The second theme included steps of SBE “process”: pre-brief, simulation, and debrief. The third, fourth, and fifth themes constituted the short- and longer-term results of the SBE intervention. The participants reported instant benefits on confidence in their expertise in communicating with patients and their guardians. Additionally, perceived effects on the empathy and professionalism were reported. Conclusion: SBE, that is based upon adult and experiential learning theories, and developed after thorough consideration of the individual learners, and their experiences and learning environments, holds potential in enhancing communication skills among post-graduate dental students.
Atsuki Hiyama,Wataru Taira,Mayo Iwasaki,Ko Sakauchi,Masaki Iwata,Joji M. Otaki 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
Morphological abnormalities of the pale grass blue butterfly, Zizeeria maha (Kollar) (Lepidoptera: Lycaenidae), have been successfully used as an environmental indicator to assess the biological impacts of the Fukushima Daiichi Nuclear Power Plant accident. To prepare for future nuclear accidents or other human and natural disasters, we examined the morphological abnormality rate of this butterfly in southwestern Japan and built a pre-disaster reference data set. We collected butterfly samples, primarily in summer 2015 from 52 localities, which were categorized into three regional groups associated with the Sendai, Ikata, or Takahama Nuclear Power Plant. Mean values of the abnormality rate and the wing color pattern modification rate for localities were 3.8% and 0.8%, respectively, indicating that butterflies were not under severe anthropogenic stress. Using all collected samples, the abnormality rate of females (7.4%) was significantly higher than that of males (2.8%). We did not detect any significant correlations of the abnormality rate or modification rate with latitude, ground radiation dose, or distance from the nuclear power plants. Based on logistic regression analyses, sex, annual average temperature, and monthly average temperature might have influenced morphological abnormalities, suggesting possible direct and epigenetic temperature effects on morphogenesis. These data serve as a reference data set for future nuclear accidents or other artificial or natural environmental disasters in southwestern Japan.
Atsuki Hiyama,Wataru Taira,Ko Sakauchi,Joji M. Otaki 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2
The pale grass blue butterfly, Zizeeria maha (Lepidoptera, Lycaenidae), has successfully been employed as an indicator species to evaluate acute biological changes in polluted human-living environments after the Fukushima nuclear accident. Here, we quantitatively examined the field sampling efficiency of the butterfly and its associated sexual sampling bias under different conditions, which may provide important information for environmental risk assessment. Sampling data were obtained in 2014 and 2015 from 87 localities across Japan. Across the localities, the mean capture rate was 17 individuals per hour per person, and males represented approximately 80% of the collected butterflies. No significant difference was detected in the capture rate under different weather conditions. Among the four habitats, the riverside showed a significantly higher capture rate than the city park. A shorter sampling time tended to yield a higher capture rate. Comparisons among prefectures and districts of collection localities revealed that the Kanto district had significantly higher percentages of collected males than 4 other districts. Fukushima prefecture also had high percentage, although not significant. A generalized linear mixed model indicated that the capture rate was significantly negatively affected by the agricultural village, the city park, the rainy weather, and latitude and positively by longitude. Together, the present study showed high sampling efficiency and versatility of this butterfly as an indicator for environmental risk assessment but simultaneously suggested preferable conditions for a field sampling design. This study also suggested a possibility that the Fukushima nuclear accident or other factors might have affected behavioral or population dynamics of the butterfly.