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Symbolic Cluster Analysis for Distribution Valued Dissimilarity
Matsui, Yusuke,Minami, Hiroyuki,Misuta, Masahiro The Korean Statistical Society 2014 Communications for statistical applications and me Vol.21 No.3
We propose a novel hierarchical clustering for distribution valued dissimilarities. Analysis of large and complex data has attracted significant interest. Symbolic Data Analysis (SDA) was proposed by Diday in 1980's, which provides a new framework for statistical analysis. In SDA, we analyze an object with internal variation, including an interval, a histogram and a distribution, called a symbolic object. In the study, we focus on a cluster analysis for distribution valued dissimilarities, one of the symbolic objects. A hierarchical clustering has two steps in general: find out step and update step. In the find out step, we find the nearest pair of clusters. We extend it for distribution valued dissimilarities, introducing a measure on their order relations. In the update step, dissimilarities between clusters are redefined by mixture of distributions with a mixing ratio. We show an actual example of the proposed method and a simulation study.
Transient osteoporosis of the hip with a femoral neck fracture during follow-up: a case report
( Yusuke Tabata ),( Shuhei Matsui ),( Masabumi Miyamoto ),( Koichiro Omori ),( Yoichiro Tabata ),( Tokifumi Majima ) 영남대학교 의과대학 2023 Yeungnam University Journal of Medicine Vol.40 No.2
We report a case of transient osteoporosis of the hip with a femoral neck fracture found during follow-up. A 53-year-old man presented with left hip pain without trauma. The pain did not improve after 2 weeks and he was brought to our hospital by ambulance. Magnetic resonance imaging (MRI) of the left hip joint showed diffuse edema in the bone marrow, which was identified by low signal intensity on T1-weighted images, high signal intensity on T2-weighted images, and increased signal intensity on short tau inversion recovery. This edema extended from the femoral head and neck to the intertrochanteric area. He was diagnosed with transient osteoporosis of the left hip. Rest gradually improved his pain; however, 3 weeks later, his left hip pain worsened without trauma. X-ray, computed tomography, and MRI results of the hip joint demonstrated a left femoral neck fracture, and osteosynthesis was performed. Differential diagnoses included avascular necrosis of the femoral head, infection, complex regional pain syndrome, rheumatoid arthritis, leukemia, and other cancers. Transient osteoporosis of the hip generally has a good prognosis with spontaneous remission within a few months to 1 year. However, a sufficient length of follow-up from condition onset to full recovery is necessary to avoid all probable complications such as fractures.
Chandra, Dulal,Matsui, Toshiyuki,Suzuki, Haruo,Kosugi, Yusuke,Fujimura, Koichi 한국작물학회 2009 Journal of crop science and biotechnology Vol.12 No.2
The changes in ammonia content as well as activity and gene expression of glutamate dehydrogenase (GDH; EC 1.4.1.2) were investigated in lettuce during storage. GDH amination activity increased with the increases in ammonia content in the outer leaf portion after 24 h of storage. GDH amination activity was substantially higher than deamination activity. The isolated partial cDNA clone referred to as LsGDH (Lactuca sativa glutamate dehydrogenase; AB334207) consisted of 757 nucleotides and was highly homologous with the GDH genes of other plants. Although the transcript of LsGDH was found in both the outer and inner leaves, the level of transcript gradually increased in the outer leaves with the progress of storage, but was only expressed in the inner leaves when higher enzyme activity was observed. Results suggest that GDH expression in lettuce is controlled by tissue specific manner and/or multiple levels of regulations.
Dulal Chandra,Toshiyuki Matsui,Haruo Suzuki,Yusuke Kosugi 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.2
The quality of harvested perishable products greatly depends on temperatures during transport and storage or market display. In this study, we evaluated the influence of low temperature and duration of storage on the storage quality in iceberg lettuce that were kept at 1±0.2℃ for 0 (control), 1 and 2 weeks and subsequently exposed to 20±2℃ for 10 days. Lettuce heads with prior storage at 1℃ for 1 or 2 weeks showed higher visual quality and lower level of wilting as compared to the control sample until 4 days of storage at 20℃. However, higher butt discoloration ratings were observed for 1 or 2-week stored samples. Higher hue angle value was observed in the 1-week sample until 4 days of storage as compared to the control or 2-week samples. No significant difference in textural quality was found between the control and 1℃ stored samples. In general, 1-week sample exhibited slightly higher puncture force and breaking energy value as compared with the control and 2-week samples. At the end of the storage, soluble sugar content declined by 52, 45 and 54% in the outer leaves and 70, 62 and 65% in the inner leaves of the control, 1 and 2-week stored samples, respectively. The heads with prior storage at 1℃ for 1 week showed a little higher sugar contents than those with 2-week or the control samples. In general, the outer leaves contained higher amount of sucrose, whereas the inner leaves contained higher amount of glucose and fructose. Although citric acid was found in trace amount, malic acid was the main component in organic acid fractions. Results suggest that iceberg lettuce could be stored at 1℃ for 2 weeks without affecting quality and that a better quality could be maintained at 20℃ with prior storage at 1℃ than continuous storage at 20℃.
Satoshi Suzuki,Takemi Matsui,Kentaro Mikajiri,Yusuke Sakaguchi,Kazuhiro Ando,Nobuyuki Nishiuchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In order to predict of accuracy of movement just before the onset of movement using biological signals, the relationships between MRCP measured as a physiological index and the accuracy of task performance were investigated. As experiments, subjects touched the target appearing 300 pixels away from a start point in a verticaldirection on a touch-sensitive screen with the forefinger. During experiments, EEG, EMG as trigger, high-speed camera images, and task efficiency were acquired. As a result, significant differences between the high- and low-performance groups were clearly confirmed on the slope of NS in MRCPs. Furthermore, a difference between these groups wasconfirmed in duration of ballistic movement.
Dulal Chandra,Toshiyuki Matsui,Haruo Suzuki,Yusuke Kosugi,Koichi Fujimura 한국작물학회 2009 Journal of crop science and biotechnology Vol.12 No.2
The changes in ammonia content as well as activity and gene expression of glutamate dehydrogenase (GDH; EC 1.4.1.2) were investigated in lettuce during storage. GDH amination activity increased with the increases in ammonia content in the outer leaf portion after 24 h of storage. GDH amination activity was substantially higher than deamination activity. The isolated partial cDNA clone referred to as LsGDH (Lactuca sativa glutamate dehydrogenase; AB334207) consisted of 757 nucleotides and was highly homologous with the GDH genes of other plants. Although the transcript of LsGDH was found in both the outer and inner leaves, the level of transcript gradually increased in the outer leaves with the progress of storage, but was only expressed in the inner leaves when higher enzyme activity was observed. Results suggest that GDH expression in lettuce is controlled by tissue specific manner and/or multiple levels of regulations. The changes in ammonia content as well as activity and gene expression of glutamate dehydrogenase (GDH; EC 1.4.1.2) were investigated in lettuce during storage. GDH amination activity increased with the increases in ammonia content in the outer leaf portion after 24 h of storage. GDH amination activity was substantially higher than deamination activity. The isolated partial cDNA clone referred to as LsGDH (Lactuca sativa glutamate dehydrogenase; AB334207) consisted of 757 nucleotides and was highly homologous with the GDH genes of other plants. Although the transcript of LsGDH was found in both the outer and inner leaves, the level of transcript gradually increased in the outer leaves with the progress of storage, but was only expressed in the inner leaves when higher enzyme activity was observed. Results suggest that GDH expression in lettuce is controlled by tissue specific manner and/or multiple levels of regulations.
Houtani, Hidetaka,Komoriyama, Yusuke,Matsui, Sadaoki,Oka, Masayoshi,Sawada, Hiroshi,Tanaka, Yoshiteru,Tanizawa, Katsuji Korean Society of Ocean Engineers 2018 Journal of advanced research in ocean engineering Vol.4 No.4
We herein propose a new design procedure of a flexible container ship model where the vertical bending and torsional vibration modes are similar to its prototype. To achieve similarity in torsional vibration mode shapes, the height of the shear center of the model must be located below the bottom hull, similar to an actual container ship with large opening decks. Therefore, we designed a ship model by imparting appropriate stiffness to the hull, using urethane foam without a backbone. We built a container ship model according to this design strategy and validated its dynamic elastic properties using a decay test. We measured wave-induced structural vibrations and present the results of tank experiments in regular and freak waves.