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A system for three-dimensional gaze fixation analysis using eye tracking glasses
Ryo Takahashi,Hiromasa Suzuki,Jouh Yeong Chew,Yutaka Ohtake,Yukie Nagai,Koichi Ohtomi 한국CDE학회 2018 Journal of computational design and engineering Vol.5 No.4
Eye tracking is a technology that has quickly become a commonplace tool for evaluating package and webpage design. In such design processes, static two-dimensional images are shown on a computer screen while a subject’s gaze where he or she looks is measured via an eye tracking device. The collected gaze fixation data are then visualized and analyzed via gaze plots and heat maps. Such evaluations using two-dimensional images are often too limited to analyze gaze on three-dimensional physical objects such as products because users look at them not from a single point of view but rather from various angles. Therefore in this study we propose methods for collecting gaze fixation data for a three-dimensional model of a given product and visualizing corresponding gaze plots and heat maps also in three dimen-sions. To achieve our goals, we used a wearable eye-tracking device, i.e., eye-tracking glasses. Further, we implemented a prototype system to demonstrate its advantages in comparison with two-dimensional gaze fixation methods.
Ryo Kanematsu,Masaki Mizuno,Tomoo Inoue,Toshiyuki Takahashi,Toshiki Endo,Seiji Shigekawa,Jun Muto,Daisuke Umebayashi,Takafumi Mitsuhara,Kazutoshi Hida,Junya Hanakita 대한척추신경외과학회 2023 Neurospine Vol.20 No.3
Objective: The impact of adjuvant radiotherapy on overall survival (OS) and progressionfree survival (PFS) of patients with grade II spinal cord astrocytomas remains controversial. Additionally, the relationship between progression and clinical deterioration after radiotherapy has not been well investigated. Methods: This study included 53 patients with grade II intramedullary spinal cord astrocytomas treated by either subtotal, partial resection or open biopsy. Their clinical performance status was assessed immediately before operation and 1, 6, 12, 24, and 60 months after surgery by Karnofsky Performance Scale (KPS). Patients with and without adjuvant radiotherapy were compared. Results: The groups with and without radiation comprised 23 and 30 patients with a mean age of 50.3 ± 22.6 years (range, 2–88 years). The mean overall disease progression rate was 47.1% during a mean follow-up period of 48.4 ± 39.8 months (range, 2.5–144.5 months). In the radiation group, 11 patients (47.8%) presented with progressive disease, whereas 14 patients (46.7%) presented with progressive disease in the group without radiation. There were no significant differences in OS or PFS among patients with or without adjuvant radiotherapy. KPS in both groups, especially radiation group, gradually decreased after operation and deteriorated before the confirmation of disease progression. Conclusion: Adjuvant radiotherapy did not show effectiveness regarding PFS or OS in patients with grade II spinal cord astrocytoma according to classical classification based on pathohistological findings.
Ryo Kanematsu,Junya Hanakita,Toshiyuki Takahashi,Manabu Minami,Tomoo Inoue,Kazuhiro Miyasaka,Hiroya Shimauchi-Ohtaki,Manabu Ueno,Fumiaki Honda 대한척추신경외과학회 2021 Neurospine Vol.18 No.4
Objective: The mechanisms of neurogenic bowel dysfunction (NBD) and neurogenic bladder (NB), which are major consequences of spinal cord injury and occasionally degenerative lumbar disease. The following in patients with cauda equina syndrome who underwent posterior decompression surgery was investigated: (1) the preoperative prevalence of NBD and NB, measured using the Constipation Scoring System (CSS) and International Prostate Symptoms Score (IPSS); (2) the degree and timing of postoperative improvement of NBD and NB. Methods: We administered the CSS and IPSS in 93 patients before surgery and at 1, 3, 6, and 12 months postoperatively. We prospectively examined patient characteristics, Japanese Orthopaedic Association (JOA) score, and postoperative improvements in each score. Results: The prevalence of symptomatic defecation and urinary symptoms at admission were 37 patients (38.1%) and 31 patients (33.3%), respectively. Among the symptomatic patients with defecation problems, 12 patients had improved at 1 month, 13 at 3 months, 14 at 6 months, and 13 at 12 months postoperatively. Among the symptomatic patients with urinary problems, 5 patients improved at 1 month, 11 at 3 months, 6 at 6 months, and 10 at 1 year postoperatively. Comparing patients with improved versus unimproved in CSS, the degree of JOA score improvement was a significant prognosis factor (p<0.05; odds ratio, 1.05). Conclusion: The prevalence of symptomatic defecation and urinary symptoms in patients with cauda equina syndrome was 38.1% and 33.3%, respectively. Decompression surgery improved symptoms in 30%–50%. These effects were first observed 1 month after the operation and persisted up to 1 year.
Solar Power Generation for Compact Hydroponic Plant Cultivation System
Ryo UCHIYAMA,Satoru YAMAGUCHI,Yoshihiko TAKAHASHI 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In light of recent trends related to global population growth and climate change, our team took on a task of developing a compact hydroponic plant cultivation system in order to provide a stable food supply. The system we are developing uses sustainable energy and does not rely on traditional methods of fossil fuel power. With our system, plants grow utilizing sunlight and when it becomes unavailable, conserved energy stored on-site is used to assist plant growth with an LED lighting system. Energy conservation patterns and amounts are calculated by assessing meteorological data by obtaining data from JMA (Japan Meteorological Agency). In this paper the process of estimating the appropriate amounts of conserved energy using weather data, data obtained from solar power generation experiments, assessment of weather forecast reliability and compatibility with solar power generation results are described.
Mechanical Optimization of Series Hybrid Electric Vehicle with Plant Oil Electric generator
Yoshihiko Takahashi,Ryo Matsumoto,Hirotake Sasai 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
We propose a new hybrid electric vehicle which uses natural energy, consumes little fuel, and operates over a long distance. We are designing a series hybrid system, in which a diesel engine operating on plant oil rotates an electric generator, and runs the vehicle using the generated electricity. The generated electricity may also be stored in batteries, which are also able to power the electric vehicle. The general intention of the proposed system is to reduce the use of non-renewable fossil fuels, and to reduce overall costs. Plant oil is ecological, and allows for the creation of a carbon neutral system in its production. Some forms of plant oils, such as non-esterified straight vegetable oil (NE-SVO) and waste vegetable oil (NE-WVO), are promising alternatives used in order to reduce fuel costs. In this paper, we will explain the concept of the proposed series hybrid electric vehicle system using plant oil, and will provide some experimental results of mechanical optimization in the electric generation system and the vehicle drive system. Considering fuel efficiency and the drive torque, optimum reduction ratios were obtained in the experimental results.
Cervical Spondylotic Amyotrophy: Case Series and Review of the Literature
Toshiyuki Takahashi,Junya Hanakita,Manabu Minami,Yosuke Tomita,Tomoki Sasagasako,Ryo Kanematsu 대한척추신경외과학회 2019 Neurospine Vol.16 No.3
Objective: Cervical spondylotic amyotrophy (CSA) is a relatively rare entity caused by cervical degenerative spinal diseases and characterized by motor weakness accompanied by remarkable muscle atrophy in the upper extremities without significant sensory deficits or spastic paraparesis in the lower extremities. Postoperative outcomes and predictive prognostic factors vary among previous reports. In the present report, we describe the surgical results in patients who were surgically treated for CSA and present a literature review. Methods: In total, 33 patients with CSA were retrospectively analyzed. Correlations between the surgical outcome and the following factors were statistically analyzed: age, sex, type of impaired muscle, preoperative severity of motor weakness, number of levels of cord or root compression, presence of a T2 high-intensity area in the spinal cord, cervical kyphosis, and methods of surgical procedure. Results: On postoperative neurological evaluation, 25 patients (75.8%) had favorable outcomes and 8 had unfavorable outcomes (proximal type, 72.2%; distal type, 78.6%). Patients with favorable outcomes were significantly younger than those with unfavorable outcomes (p=0.013). Patient’s characteristics except for age and radiological factors were not correlated to surgical outcome. Conclusion: The present study focused on the surgical results in patients who were surgically treated for CSA along with updated information from a literature review. Improvement of motor weakness is expected with acceptable prevalence although higher age can be a negative factor. Surgical outcomes and predictive factors related to a poor prognosis were determined and compared with those of previous articles.
Development of a Multi-Channel Processing Matched Filter Using FPGA for CDMA-QAM Method
Hiroshi Mochizuki,Sei Takahashi,Hideo Nakamura,Satoshi Nishida,Ryo Ishikawa 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
At present, we attempt to apply our proposed CDMA-QAM method to railway signaling, and evaluate basic characteristics using computer simulation. In this paper, we describe development of a multichannel processing matched lter as a CDMA receiver. We noted that Walsh code is 1 or -1, and proposed the design that has no multipliers. In addition, we applied some techniques such as time-sharing processing, and optimized the design to reduce number of logic elements that an FPGA has. As a result, we show that we could implement the multi-channel processing matched lter in an FPGA.