Post-cyclic Degradation of Strength and Stiffness for Non-plastic Silt

송병웅(Song Byung-Woong),김흥택(Kim Hong-Taek),Yasuhara kazuya(Yasuhara kazuya),Murakami Satoshi(Murakami Satoshi),박인준(Park Inn-Joon) 한국지반환경공학회 2003 한국지반환경공학회 학술발표회논문집 Vol.2003 No.-

CD57 (Leu-7, HNK-1) immunoreactivity seen in thin arteries in the human fetal lung

Satoshi Ishizuka,Zhe Wu Jin,Masahito Yamamoto,Gen Murakami,Takeshi Takayama 대한해부학회 2018 Anatomy & Cell Biology Vol.51 No.2

CD57 (synonyms: Leu-7, HNK-1) is a well-known marker of nerve elements including the conductive system of the heart, as well as natural killer cells. In lung specimens from 12 human fetuses at 10‒34 weeks of gestation, we have found incidentally that segmental, subsegmental, and more peripheral arteries strongly expressed CD57. Capillaries near developing alveoli were often or sometimes positive. The CD57-positive tissue elements within intrapulmonary arteries seemed to be the endothelium, internal elastic lamina, and smooth muscle layer, which corresponded to tissue positive for a DAKO antibody reactive with smooth muscle actin we used. However, the lobar artery and pulmonary arterial trunk as well as bronchial arteries were negative. Likewise, arteries in and along any abdominal viscera, as well as the heart, thymus, and thyroid, did not express CD57. Thus, the lung-specific CD57 reactivity was not connected with either of an endodermal- or a branchial arch-origin. CD57 antigen is a sugar chain characterized by a sulfated glucuronic acid residue that is likely to exist in some glycosphingolipids. Therefore, a chemical affinity or an interaction might exist between CD57-positive arterioles and glycosphingolipids originating from alveoli, resulting in acceleration of capillary budding to make contact with the alveolar wall. CD57 might therefore be a functional marker of the developing air-blood interface that characterizes the fetal lung at the canalicular stage.

Towards the Creation of an ECU Model Exchange Market

Kazuaki Murakami,Norifumi Yoshimatsu,Pradeep Rao,Shigeru Oho,Satoshi Shimada 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

Model based design can be used to address the challenges brought about by complex ECU designs. This paper introduces the use of models at various stages of ECU design and highlights their advantages. We particularly focus on the use of software models in ECU design and discuss their classification based on their use in the embedded system design flow. We discuss some of the issues involved in the use of the software models in ECU design and identify directions for research to facilitate greater use of software models in mainstream ECU design.

Distributed Cooperative Networking Architecture for Multimedia Communication Based on Autonomous Routing

Koso Murakami,Satoshi Uno,Kazuhiko Kinoshita,Manabu Higashida,Tetsuya Takine 대한전자공학회 1996 ITC-CSCC :International Technical Conference on Ci Vol.- No.-

Relative validity of dietary patterns derived from a self-administered diet history questionnaire using factor analysis among Japanese adults

Okubo, Hitomi,Murakami, Kentaro,Sasaki, Satoshi,Kim, Mi Kyung,Hirota, Naoko,Notsu, Akiko,Fukui, Mitsuru,Date, Chigusa Cambridge University Press 2010 Public health nutrition Vol.13 No.7

<B>Abstract</B><B>Objective</B><P>Although dietary pattern approaches derived from dietary assessment questionnaires are widely used, only a few studies in Western countries have reported the validity of this approach. We examined the relative validity of dietary patterns derived from a self-administered diet history questionnaire (DHQ) among Japanese adults.</P><B>Design</B><P>The DHQ, assessing diet during the preceding month, and 4 d dietary records (DR) were collected in each season over one year. To derive dietary patterns, 145 food items in the DHQ and 1259 in the DR were classified into thirty-three predefined food groups, and entered into a factor analysis.</P><B>Setting</B><P>Three areas in Japan; Osaka (urban), Nagano (rural inland) and Tottori (rural coastal).</P><B>Subjects</B><P>A total of ninety-two Japanese women and ninety-two Japanese men aged 31-76 years.</P><B>Results</B><P>We identified three dietary patterns (‘healthy’, ‘Western’ and ‘Japanese traditional’) in women and two (‘healthy’ and ‘Western’) in men, which showed a relatively similar direction and magnitude of factor loadings of food groups across the first and mean of four DHQ (DHQ1 and mDHQ, respectively) and 16 d DR. The Pearson correlation coefficients between DHQ1 and 16 d DR for the healthy, Western and Japanese traditional patterns in women were 0·57, 0·36 and 0·44, and for the healthy and Western patterns in men were 0·62 and 0·56, respectively. When mDHQ was examined, the correlation coefficients improved for women (0·45-0·69).</P><B>Conclusions</B><P>Dietary patterns derived from the DHQ could be used for epidemiological studies as surrogates of those derived from DR.</P>

Development and growth of the temporal fascia: a histological study using human fetuses

Kei Kitamura,Satoshi Ishizuka,Ji Hyun Kim,Hitoshi Yamamoto,Gen Murakami,Jose Francisco Rodríguez-Vázquez,Shin-ichi Abe 대한해부학회 2024 Anatomy & Cell Biology Vol.57 No.2

The temporal fascia is a double lamina sandwiching a thick fat layer above the zygomatic bony arch. To characterize each lamina, their developmental processes were examined in fetuses. We observed histological sections from 22 half-heads of 10 mid-term fetuses at 14–18 weeks (crown-rump length, 95–150 mm) and 12 near-term fetuses at 26–40 weeks (crown-rump length, 215–334 mm). The superficial lamina of the temporal fascia was not evident at mid-term. Instead, a loose subcutaneous tissue was attached to the thin, deep lamina of the temporal fascia covering the temporalis muscle. At near-term, the deep lamina became thick, while the superficial lamina appeared and exhibited several variations: i) a mono layered thick membrane (5 specimens); ii) a multi-layered membranous structure (6) and; iii) a cluster of independent thick fasciae each of which were separated by fatty tissues (1). In the second and third patterns, fatty tissue between the two laminae was likely to contain longitudinal fibrous bands in parallel with the deep lamina. Varying proportions of the multi-layered superficial lamina were not attached to the zygomatic arch, but extended below the bony arch. Whether or not lobulation or septation of fatty tissues was evident was not dependent on age. The deep lamina seemed to develop from the temporalis muscle depending on the muscle contraction. In contrast, the superficial lamina developed from subcutaneous collagenous bundles continuous to the cheek. Therein, a difference in development was clearly seen between two categories of the fasciae.

Effects of implant tilting and the loading direction on the displacement and micromotion of immediately loaded implants: an in vitro experiment and finite element analysis

Tsutomu Sugiura,Kazuhiko Yamamoto,Satoshi Horita,Kazuhiro Murakami,Sadami Tsutsumi,Tadaaki Kirita 대한치주과학회 2017 Journal of Periodontal & Implant Science Vol.47 No.4

Purpose: The purpose of this study was to investigate the effects of implant tilting and the loading direction on the displacement and micromotion (relative displacement between the implant and bone) of immediately loaded implants by in vitro experiments and finite element analysis (FEA). Methods: Six artificial bone blocks were prepared. Six screw-type implants with a length of 10 mm and diameter of 4.3 mm were placed, with 3 positioned axially and 3 tilted. The tilted implants were 30° distally inclined to the axial implants. Vertical and mesiodistal oblique (45° angle) loads of 200 N were applied to the top of the abutment, and the abutment displacement was recorded. Nonlinear finite element models simulating the in vitro experiment were constructed, and the abutment displacement and micromotion were calculated. The data on the abutment displacement from in vitro experiments and FEA were compared, and the validity of the finite element model was evaluated. Results: The abutment displacement was greater under oblique loading than under axial loading and greater for the tilted implants than for the axial implants. The in vitro and FEA results showed satisfactory consistency. The maximum micromotion was 2.8- to 4.1-fold higher under oblique loading than under vertical loading. The maximum micromotion values in the axial and tilted implants were very close under vertical loading. However, in the tilted implant model, the maximum micromotion was 38.7% less than in the axial implant model under oblique loading. The relationship between abutment displacement and micromotion varied according to the loading direction (vertical or oblique) as well as the implant insertion angle (axial or tilted). Conclusions: Tilted implants may have a lower maximum extent of micromotion than axial implants under mesiodistal oblique loading. The maximum micromotion values were strongly influenced by the loading direction. The maximum micromotion values did not reflect the abutment displacement values.

The effects of bone density and crestal cortical bone thickness on micromotion and peri-implant bone strain distribution in an immediately loaded implant: a nonlinear finite element analysis

Tsutomu Sugiura,Kazuhiko Yamamoto,Satoshi Horita,Kazuhiro Murakami,Sadami Tsutsumi,Tadaaki Kirita 대한치주과학회 2016 Journal of Periodontal & Implant Science Vol.46 No.3

Purpose: This study investigated the effects of bone density and crestal cortical bone thickness at the implant-placement site on micromotion (relative displacement between the implant and bone) and the peri-implant bone strain distribution under immediate-loading conditions. Methods: A three-dimensional finite element model of the posterior mandible with an implant was constructed. Various bone parameters were simulated, including low or high cancellous bone density, low or high crestal cortical bone density, and crestal cortical bone thicknesses ranging from 0.5 to 2.5 mm. Delayed- and immediate-loading conditions were simulated. A buccolingual oblique load of 200 N was applied to the top of the abutment. Results: The maximum extent of micromotion was approximately 100 μm in the low-density cancellous bone models, whereas it was under 30 μm in the high-density cancellous bone models. Crestal cortical bone thickness significantly affected the maximum micromotion in the low-density cancellous bone models. The minimum principal strain in the peri-implant cortical bone was affected by the density of the crestal cortical bone and cancellous bone to the same degree for both delayed and immediate loading. In the low-density cancellous bone models under immediate loading, the minimum principal strain in the peri-implant cortical bone decreased with an increase in crestal cortical bone thickness. Conclusions: Cancellous bone density may be a critical factor for avoiding excessive micromotion in immediately loaded implants. Crestal cortical bone thickness significantly affected the maximum extent of micromotion and peri-implant bone strain in simulations of low-density cancellous bone under immediate loading.

Temporal Change in Radiological Environments on Land after the Fukushima Daiichi Nuclear Power Plant Accident

Saito, Kimiaki,Mikami, Satoshi,Andoh, Masaki,Matsuda, Norihiro,Kinase, Sakae,Tsuda, Shuichi,Sato, Tetsuro,Seki, Akiyuki,Sanada, Yukihisa,Wainwright-Murakami, Haruko,Yoshimura, Kazuya,Takemiya, Hiroshi The Korean Association for Radiation Protection 2019 방사선방어학회지 Vol.44 No.4

Massive environmental monitoring has been conducted continuously since the Fukushima Daiichi Nuclear Power accident in March of 2011 by different monitoring methods that have different features together with migration studies of radiocesium in diverse environments. These results have clarified the characteristics of radiological environments and their temporal change around the Fukushima site. At three months after the accident, multiple radionuclides including radiostrontium and plutonium were detected in many locations; and it was confirmed that radiocesium was most important from the viewpoint of long-term exposure. Radiation levels around the Fukushima site have decreased greatly over time. The decreasing trend was found to change variously according to local conditions. The air dose rates in environments related to human living have decreased faster than expected from radioactive decay by a factor of 2-3 on average; those in pure forest have decreased more closely to physical decay. The main causes of air dose rate reduction were judged to be radioactive decay, movement of radiocesium in vertical and horizontal directions, and decontamination. Land-use categories and human activities have significantly affected the reduction tendency. Difference in the air dose rate reduction trends can be explained qualitatively according to the knowledge obtained in radiocesium migration studies; whereas, the quantitative explanation for individual sites is an important future challenge. The ecological half-lives of air dose rates have been evaluated by several researchers, and a short-term half-life within 1 year was commonly observed in the studies. An empirical model for predicting air dose rate distribution was developed based on statistical analysis of an extensive car-borne survey dataset, which enabled the prediction with confidence intervals. Different types of contamination maps were integrated to better quantify the spatial data. The obtained data were used for extended studies such as for identifying the main reactor that caused the contamination of arbitrary regions and developing standard procedures for environmental measurement and sampling. Annual external exposure doses for residents who intended to return to their homes were estimated as within a few millisieverts. Different forms of environmental data and knowledge have been provided for wide spectrum of people. Diverse aspects of lessons learned from the Fukushima accident, including practical ones, must be passed on to future generations.

Implantation of Liquid Nitrogen Frozen Tumor Tissue after Posterior Decompression and Stabilization for Metastatic Spinal Tumors

Kazuya Shinmura,Hideki Murakami,Satoru Demura,Satoshi Kato,Katsuhito Yoshioka,Hiroyuki Hayashi,Noriaki Yokogawa,Takashi Igarashi,Moriyuki Fujii,Noritaka Yonezawa,Hiroyuki Tsuchiya 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.6

Study Design: A retrospective study. Purpose: To evaluate the immunity-enhancing effect of implantation of a liquid nitrogen-treated tumor. Overview of Literature: We have developed a new technique of implanting a tumor frozen in liquid nitrogen after posterior decompression and stabilization, with the aim of enhancing antitumor immunity in order to prolong the survival period of the patient. In the current study, the immunity-enhancing effect of this new technique has been evaluated. Methods: The subjects were 19 patients in whom we had earlier performed decompression and stabilization between April 2011 and September 2013. The 19 subjects were divided into two groups, namely a frozen autologous tumor tissue implantation group (n=15; “implantation group”), which consisted of patients, who underwent implantation with autologous tumor tissue frozen in liquid nitrogen, and a control group (n=4), which consisted of patients, who did not undergo autologous cancer transplantation. To evaluate the immunity-enhancing effect of the protocol, plasma cytokines (interferon [IFN]-γ and interleukin [IL]-12) were analyzed before surgery and a month after surgery. Results: The mean rate of increase in IFN-γ was significantly higher in the implantation group (p =0.03). Regarding IL-12, no significant difference was observed between the groups, although the implantation group exhibited increased levels of IL-12 (p =0.22). Conclusions: Decompression and stabilization combined with autologous frozen tumor cell implantation can enhance cancer immunity in metastatic spinal tumor patients. It is hypothesized that this procedure might prevent local recurrence and prolong survival period.