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Search Results: 1 - 10 of 3061 matches for " Hiroki Mori "
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Band Splitting Permutations for Spatially Coupled LDPC Codes Enhancing Burst Erasure Immunity
Hiroki Mori,Tadashi Wadayama
Mathematics , 2015,
Abstract: It is well known that spatially coupled (SC) codes with erasure-BP decoding have powerful error correcting capability over memoryless erasure channels. However, the decoding performance of SC-codes significantly degrades when they are used over burst erasure channels. In this paper, we propose band splitting permutations (BSP) suitable for $(l,r,L)$ SC-codes. The BSP splits a diagonal band in a base matrix into multiple bands in order to enhance the span of the stopping sets in the base matrix. As theoretical performance guarantees, lower and upper bounds on the maximal burst correctable length of the permuted $(l,r,L)$ SC-codes are presented. Those bounds indicate that the maximal correctable burst ratio of the permuted SC-codes converges to 1/k where k=r/l. This implies the asymptotic optimality of the permuted SC-codes in terms of burst erasure correction.
A Resection of the Giant First Left Rib Tumor and Chest Wall Reconstruction by Transmanubrial Osteomuscular Sparing Approach  [PDF]
Takanori Ayabe, Masaki Tomita, Hiroki Mori, Eiichi Chosa, Kunihide Nakamura
Open Journal of Thoracic Surgery (OJTS) , 2015, DOI: 10.4236/ojts.2015.53008
Abstract: A 64-year-old female had noticed an 11 × 6 cm mass growing on her left first rib. We performed a resection of the first and second ribs and a reconstruction of the chest wall. A thoracotomy was performed at the anterolateral second intercostal space. The second rib cartilage was divided at the left parasternum. Based on a transmanubrial osteomuscular sparing approach, the left-upper part of the sternum and the first rib cartilage were both cut at the left clavicular-sternum joint. The posterior parts of the two ribs involving the tumor were resected at the transverse process of the vertebral bone by tearing off the anterior, middle, and posterior scalene muscles, subclavicular artery and vein. The defect size of the thorax was 15 × 9 cm, which was reconstructed by covering with a polytetrafluoroethylene dual mesh (Dual mesh, Gore tex, 2 mm). The major pectoral muscle flap was used to cover the mesh. The postoperative pathological examination diagnosed a poorly differentiated fibrosarcoma. Eventually, she had palliative therapy for the postoperative metastatic chest wall. She died 14 months after the operation.
Clinical Outcomes, Safety and Efficacy of Intrapleural Hyperthermic Chemotherapy for Thoracic Malignant Diseases with Pleural Effusion  [PDF]
Takanori Ayabe, Masaki Tomita, Eiichi Chosa, Hiroki Mori, Kunihide Nakamura
Journal of Cancer Therapy (JCT) , 2016, DOI: 10.4236/jct.2016.73021
Abstract: Background: We have performed the cisplatin-based intrapleural hyperthermic chemotherapy (IPHC) for advanced lung cancer with pleural effusion and for malignant pleural mesothelioma (MPM). Retrospectively, the outcomes of the IPHC were evaluated. Methods: For 14 years from February, 2000 to February, 2014, we performed 14 cases of IPHC including 8 lung cancers (staged-IV) and 6 MPMs (staged-III: 5; IV: 1). We divided these cases in two groups; the lung cancer group (LC group) and MPM group, and assessed the perioperative factors, toxicities, and effectiveness. Results: The patient age averaged 66.5 ± 11.1 years old (11 males and 3 females). The pathology was 7 pulmonary adenocarcinomas, 1 pulmonary angiosarcoma, and 6 epithelial type MPMs. The regimens of the IPHC were CDDP (300 mg) plus saline (n = 12), CDDP (100 mg) plus saline (n = 1), and CDDP (300 mg) plus distilled water (n = 1). The operation and IPHC time was 204 ± 70 and 59 ± 19 minutes, respectively. Intraoperative complication was observed in 2 lung injuries due to exfoliation of the pleural adhesion in the LC group. Blood loss was 292 ± 365 ml. The postoperative complication, i.e., subcutaneous emphysema, was observed as grade 2 pulmonary fistula (7.1%, 1/14), which was significantly observed in the LC group (1/8, 12.5%) compared to the MPM group (0/8, 0%) (p = 0.040). The hematological toxicity of more than grade 3 was observed in only one case of anemia (7.1%, 1/14) and in the LC group (25%, 1/8). The grade 3 anemia (25%, 1/8) and grade 2 neutropenia (25%, 1/8) in the LC group were significantly observed compared to those in the MPM group (0%, 0/6), respectively (p = 0.040). The postoperative cytology of the malignant cells in the pleural effusion resulted in the negative (n = 6), positive (n = 7), and not evaluated (n = 1), and the control rate was calculated to be 46.2% (6/13). There was no significant difference between the two groups (p = 0.083), that is, 42.9% (3/7) in the LC group and 50.0% (3/6) in the MPM group. For the postoperative amounts of the pleural effusion, reduction (n = 10), unchanged (n = 3), and not evaluated (n = 1), the control rate was calculated to be 76.9% (10/13). There was a significant difference between the two groups (p = 0.042), that is, 71.4% (5/7) in the LC group and 83.3% (5/6) in the MPM group. Conclusion: The IPHC treatment resulted in no major complications, and fewer adverse events of more than grade 3. The outcome of the IPHC was safety, and a very
Relationship among Sleep Quality Physical Health Conditions and Lifestyle Habits among Elementary School Students  [PDF]
Hiroko Sugimoto, Tetsuya Tanioka, Yuko Yasuhara, Kenji Mori, Yoshiko Gogi, Hiroki Mori, Mihoko Nakanii, Rozzano Locsin
Open Journal of Psychiatry (OJPsych) , 2017, DOI: 10.4236/ojpsych.2017.74021
Abstract: The purpose of this research was to reveal the relationship among students’ sleep quality, body temperature and lifestyle habits, growth and their physical strength. Subjects were 226 elementary school students from first grade to sixth grade, in four elementary schools at the Chugoku and Shikoku areas in Japan. The study period was from October 2014 to December 2015. Evaluation items used were the PSQI (Pittsburgh Sleep Quality Index, Japanese version), body temperature, lifestyle habits, and national physical fitness test. Relationships were analyzed using Pearson’s chi square test, Fisher’s exact test, residual analysis, φ-coefficient, odds ratio and 95% confidence interval, and Spearman’s rank correlation coefficient using SPSS 20 (SPSS Inc., Chicago, IL, USA). The level of statistical significance was set at 0.05. The number of students with good sleep quality who showed less than six-point score at the PSQI was 218 (96.5%), and with poor sleep quality were eight students (3.5%). Especially, “sometimes do not eat breakfast” and “had difficulty sleeping” were independent risk factors for negative arousal. In the lifestyle habits, it was observed significantly that students who had a good sleep ate breakfast every morning. The significant positive correlation was between sleep quality and the time spent watching television, the age and the time using the internet. The significant negative correlation was observed between length of sleep, time spent watching television, using internet and playing games, body temperature and age. The students with temperature of less than 36°C were 35 (15.5%). Those students did not eat breakfast every morning, or ate school lunch. This study revealed that sleep condition and temperature of elementary school students were related to eating breakfast and using media time. It was considered very important to educate the students and their guardians that eating breakfast is a necessity and adjusting the use of multimedia, so that students can acquire desirable lifestyle habits.
Visuo-motor related time analysis using electroencephalograms  [PDF]
Kengo Yotani, Hiroyuki Tamaki, Hiroki Nakamoto, Atsumu Yuki, Hikari Kirimoto, Koji Kitada, Futoshi Ogita, Shiro Mori
World Journal of Neuroscience (WJNS) , 2013, DOI: 10.4236/wjns.2013.33018
Abstract:

The objective of the present study was to assess the relationship of response time and peak latency of P300 with a simple-reaction task. Seven male subjects who were experienced players in decision-making sports were included. Two main findings were noted. First, the P300 latencies of Fz and Pz were correlated with visuo-motor related time. Second, in terms of latencies of visual evoked potentials, the correlations were observed only between Oz-P2 latency and visuo-motor related time. These results suggest that the length of visuo-motor related time is related to the processing involved in the higher order brain site involving specific processing in the visual cortex.

Hepatocellular adenoma associated with familial adenomatous polyposis coli
Keisuke Inaba,Takanori Sakaguchi,Kiyotaka Kurachi,Hiroki Mori
World Journal of Hepatology , 2012, DOI: 10.4254/wjh.v4.i11.322
Abstract: Hepatocellular adenoma (HCA) is a benign liver tumor that most frequently occurs in young women using oral contraceptives. We report a rare case of HCA in a 29 years old female with familial adenomatous polyposis (FAP). The first proband was her sister, who underwent a total colectomy and was genetically diagnosed as FAP. A tumor, 3.0 cm in diameter, was detected in the right lobe of the liver during a screening study for FAP. A colonoscopy and gastroendoscopy revealed numerous adenomatous polyps without carcinoma. The patient underwent a total colectomy and ileo-anal anastomosis and hepatic posterior sectoriectomy. The pathological findings of the liver tumor were compatible with HCA. The resected specimen of the colon revealed multiple colonic adenomatous polyps. Examination of genetic alteration revealed a germ-line mutation of the adenomatous polyposis coli (APC) gene. Inactivation of the second APC allele was not found. Other genetic alterations in the hepatocyte nuclear factor 1 alpha and β-catenin gene, which are reported to be associated with HCA, were not detected. Although FAP is reported to be complicated with various neoplasias in extracolic organs, only six cases of HCA associated with FAP, including the present case, have been reported. Additional reports will establish the precise mechanisms of HCA development in FAP patients.
EPH-EPHRIN in human gastrointestinal cancers
Haruhiko Sugimura,Jian-Dong Wang,Hiroki Mori,Masaru Tsuboi
World Journal of Gastrointestinal Oncology , 2010,
Abstract: Ever since its discovery two decades ago, the erythropoietin-producing hepatoma (EPH)-EPHRIN system has been shown to play multifaceted roles in human gastroenterological cancer as well as neurodevelopment. Over-expression, amplification and point mutations have been found in many human cancers and many investigators have shown correlations between these up-regulations and tumor angiogenesis. Thus, the genes in this family are considered to be potential targets of cancer therapy. On the other hand, the down-regulation of some members as a result of epigenetic changes has also been reported in some cancers. Furthermore, the correlation between altered expressions and clinical prognosis seems to be inconclusive. A huge amount of protein-protein interaction studies on the EPH-EPHRIN system have provided a basic scheme for signal transductions, especially bi-directional signaling involving EPH-ERPHRIN molecules at the cell membrane. This information also provides a manipulative strategy for harnessing the actions of these molecules. In this review, we summarize the known alterations of EPH-EPHRIN genes in human tumors of the esophagus, stomach, colorectum, liver and pancreas and present the perspective that the EPH-EPHRIN system could be a potential target of cancer therapy.
Influence of Affordances in the Home Environment on Motor Development of Young Children in Japan
Shiro Mori,Hiroki Nakamoto,Hiroshi Mizuochi,Sachi Ikudome
Child Development Research , 2013, DOI: 10.1155/2013/898406
Abstract:
Influence of Affordances in the Home Environment on Motor Development of Young Children in Japan
Shiro Mori,Hiroki Nakamoto,Hiroshi Mizuochi,Sachi Ikudome,Carl Gabbard
Child Development Research , 2013, DOI: 10.1155/2013/898406
Abstract: Previous research indicates that the home environment is a significant factor in early child development. The present study examined influence of the multidimensional home environment on young Japanese children’s motor development. A Japanese translation of the Affordances in the Home Environment for Motor Development-Self Report (AHEMD-SR) was used to assess home motor affordances in 262 families. Motor ability was assessed by parental report using the Enjoji Infant Analytic Developmental Test. We also asked parents to rate their own physical activity in terms of level and years of experience. As results, we found that the home environment in Japan was generally sufficient for children’s motor development and that children’s access to Fine Motor Toys (FMT) and Gross Motor Toys (GMT) had the strongest influence on their development. Analysis also indicated that AHEMD-SR scores were higher for children of parents who had some level of physical activity experience compared to children whose parents indicated no physical activity experience. Parents’ self-reported activity level was correlated with higher scores for the subscales FMT and GMT and for total AHEMD-SR score. These results indicate that both the physical and social-psychological environments (parental experience and views) of the home influenced children’s motor development. 1. Introduction In the field of child development, environmental influences are considered critical factors for optimal growth and development. The home environment, in particular, is a primary agent for learning and development in children (see review by Son and Morrison [1]). Interestingly, one of the major findings in studies that assessed the general characteristics of the home and its relationship to a child’s later behavior is that toy availability was a strong predictor of future mental behavior [2, 3]. Subsequent studies have focused on toy availability and motor development [2–4]; however, little is known about the multidimensional home environment and motor development. The multidimensional home environment includes not only physical factors (such as movement play equipment in the home and the presence of a nearby playground), but also social-psychological factors (such as number of playmates, family composition, and amount of parental attention). In addition, affordance is a fundamental concept in the ecological (affordance) theory for action [5, 6]. Hirose [7] stated that “affordances are opportunities for action that objects, events, or places in the environment provide for the animal.” That is, action can be
Long-Term Treatment Outcome after Only Popliteal Lymph Node Dissection for Nodal Metastasis in Malignant Melanoma of the Heel: The Only “Interval Node” Dissection Can Be an Adequate Surgical Treatment
Kentaro Tanaka,Hiroki Mori,Mutsumi Okazaki,Aya Nishizawa,Hiroo Yokozeki
Case Reports in Oncological Medicine , 2013, DOI: 10.1155/2013/259326
Abstract: We present a patient with malignant melanoma on his heel. Wide local excision was performed, along with sentinel lymph node biopsy of the inguinal and popliteal lesions. The primary site was clear of tumor at all margins; the inguinal nodes were negative, but the popliteal node was positive for metastatic melanoma. Only radical popliteal lymph node dissection was performed. The patient went on to receive adjuvant chemoimmunotherapy. There was no recurrence or complication until the long-term followup. Popliteal drainage from below the knee is uncommon, and the rate of popliteal-positive and inguinal-negative cases is estimated to be less than 1% of all melanomas. There is no established evidence about how to treat lymph nodes in these cases. Because we considered popliteal nodes as a regional, not interval, lymph node basin, only popliteal lymph node dissection was performed, and good postoperative course was achieved. The first site of drainage is the sentinel node, and the popliteal node can be a sentinel node. The inguinal node is not a sentinel node in all lower extremity melanomas. This case illustrates the importance of individual detailed investigation of lymphatic drainage patterns from foot to inguinal and popliteal nodes. 1. Introduction Sentinel lymph node biopsy is now an essential procedure for the treatment of cutaneous malignant melanoma. Lymphoscintigraphy is commonly used for identification of the sentinel lymph node, which is sometimes detected in unexpected areas, such as the popliteal fossa in distal lower extremity melanoma cases. These are called interval nodes. Popliteal drainage from below the knee is uncommon, and popliteal node metastasis cases are rare. In particular, the rate of popliteal-positive and inguinal-negative cases is estimated to be less than 1% of all melanomas. In these cases, management of lymph node dissection is necessary for definitive surgical treatment, but there are no clear answer and no established evidence about how to treat lymph nodes in the literature. Some surgeons do not examine the popliteal fossa, do not perform popliteal node biopsy, or consider the presence of popliteal metastasis positivity as an indication for inguinal dissection. We present a case of a patient with a malignant melanoma on his left heel, who had positive popliteal node metastasis and negative inguinal node. Only popliteal lymph node dissection was performed, and there was no recurrence or complication until long-term followup. This case study illustrates the importance of more detailed individual investigation of lymphatic
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