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DEBRIS DISKS EXPLORED BY AKARI AND IRSF
Kiriyama, Y.,Ishihara, D.,Nagayama, T.,Kaneda, H.,Oyabu, S.,Onaka, T.,Fujiwara, H. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
Using the AKARI mid-infrared all-sky survey catalogue, we are searching for debris disks which are important objects as an observational clue to on-going planetary system formation. Debris disk candidates are selected through a significant excess of the measured flux over the predicted flux for the stellar photospheric emission at $18{\mu}m$. The fluxes were originally estimated based on the near-infrared spectral energy distributions (SEDs) of central stars constructed from the 2MASS J-, H-, and Ks-band fluxes. However, we found that in many cases the 2MASS photometry has large errors due to saturation in the central part of a star image. Therefore we performed follow-up observations with the IRSF 1.4m near-infrared telescope in South Africa to obtain accurate fluxes in the J-, H-, and Ks-bands. As a result, we have succeeded in improving the SEDs of the central stars. This improvement of the SEDs allows us to make more reliable selection of the candidates.
Tomohiko Kiriyama,Rumi Tanemura,Yoshihiro Nakamura,Chiaki Takemoto,Mariko Hashimoto,Hirohiko Utsumi 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.8
Objective Substantial research has revealed cognitive function impairments in patients with major depressive disorder (MDD). However, the relationship between MDD cognitive function impairment and brain activity is yet to be elucidated. This study aimed to reveal this relationship using near-infrared spectroscopy (NIRS) to extensively measure frontotemporal cortex function. Methods We recruited 18 inpatients with MDD and 22 healthy controls. Regional oxygenated hemoglobin changes (oxy-Hb) were measured during a verbal fluency task and its relationship to cognitive function was assessed. Cognitive function was assessed using the Japanese version of the Brief Assessment of Cognition in Schizophrenia. Results Compared to healthy controls, patients with MDD displayed poorer motor speed, attention and speed of information processing, and executive function. In the bilateral prefrontal and temporal surface regions, regional oxy-Hb changes were significantly lower in patients with MDD than in healthy individuals. Moreover, we observed a correlation between reduced activation in the left temporal region and poor motor speed in patients with MDD. Conclusion We suggest that reduced activation in the left temporal region in patients with MDD could be a biomarker of poor motor speed. Additionally, NIRS may be useful as a noninvasive, clinical measurement tool for assessing motor speed in these patients.
Yusuke Kiriyama,Hikari Shimadera,Syuichi Itahashi,Hiroshi Hayami,Kazuhiko Miura 한국대기환경학회 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.1
Increasing ozone concentrations are observed overJapan from year to year. One cause of high ozoneconcentration in the Kanto region, which includesareas inland from large coastal cities such as metropolitanTokyo, is the transportation of precursors bysea breezes. However, high ozone concentrationsare also observed in the morning, before sea breezesapproach inland areas. In this point, there would bea possibility of residual ozone existing above thenocturnal boundary layer affects the ozone concentrationin the following morning. In this study, weutilized the Weather Research and Forecasting modeland the Community Multiscale Air Quality model toevaluate the effect of regional precursors and residualozone on ozone concentrations over the inlandKanto region. The results show that precursors emittedfrom non-metropolitan areas affected inlandozone concentrations more than did precursors frommetropolitan areas. Moreover, calculated resultsindicate downward transportation of residual ozone,resulting in increased concentration. The residualozone was also affected by precursors emitted fromnon-metropolitan areas.
New Method to Measure the Rise Time of a Fast Pulse Slicer for Laser Ion Acceleration Research
Mori, Michiaki,Yogo, Akifumi,Kiriyama, Hiromitsu,Nishiuchi, Mamiko,Ogura, Koichi,Orimo, Satoshi,Ma, Jinglong,Sagisaka, Akito,Kanazawa, Shuhei,Kondo, Shuji,Nakai, Yoshiki,Akutsu, Atsushi,Yamamoto, Yoic IEEE 2008 IEEE transactions on plasma science Vol.36 No.4
<P> A dependence of cutoff proton kinetic energy on laser prepulse duration has been observed. Amplified spontaneous emission pedestal duration is controlled by a fast electrooptic pulse slicer where the rise time is estimated to be 130 ps. We demonstrate a new correlated spectral technique for determining this rise time using a stretched frequency-chirped pulse. </P>
The Way to Make Student Project Activity Successful
Hanabusa, Takao,Konishi, Masaki,Kiriyama, Satoshi Korean Society for Engineering Education 2014 공학교육연구 Vol.17 No.5
Student independent project activity is beneficial for enhancing many kinds of abilities, e.g., team working, collaboration, communication, presentation, creativity, leadership, and so on. More than ten project teams actively perform every year in the Center for Innovation and Creativity Development of The University of Tokushima. The project management workshop was planned in order to make project activity successful. In this workshop, the team members studied the importance of holding a common objective among them and of making a clear plan for achieving the activity. They practiced brainstorming method and KJ method and experienced a PDCA cycle. The team activity will be fruitful on the basis of the project management method.
Bioavailability of Gentamicin from a New Rectal Dosage Vehicle in Rabbits
WATANABE, YOSHITERU,MATSUMOTO, YOSHIAKI,KIRIYAMA, MIYUKI,KAKUHARI, TAKESHI,MATSUMOTO, MITSUO,KU, YOUNG-SOON,OBAYASHI, MASAHIKO,ANJOU, SAEKO 梨花女子大學校 藥學硏究所 1994 藥學硏究論文集 Vol.- No.4
The bioavailability of gentamicin (GM), a model drug of aminoglycoside antibiotics, from a new rectal dosage vehicle, hollow-type suppositories containing GM and fatty acids (sodium salts) with different acyl chain lengths in their chemical structure, was investigated in rabbits. Fatty acids with chain lengths varying from 6 to 12 carbon atoms (C_6-C_12) enhanced GM absorption in the rectum. Consequently, it was observed that an optimum length of the acyl chain of between C_8 and C_10 enhanced the extent of GM absorption. The absorption-enhancing effect of valproic acid (VPA), a C_8 branched-chain molecule, was less than that of octanoic acid (OA), a C_8 straight-chain molecule. Branching of the acyl chain of the fatty acid seems to decrease the absorption-enhancing effect. This study demonstrates that the C_8- C_10 acyl group appears to play an essential role in the mechanism of GM absorption enhancement. The hollow-type suppositories containing GM and fatty acids, particularly decanoic acid (DA) and OA, are one of the most promising and practical dosage vehicles for rectal delivery of aminoglycoside antibiotics such as GM, instead of the use of injection dosage form.
Hiroshi Kataoka,Yohei Okada,Takao Kiriyama,Yorihiro Kita,Junji Nakamura,Shu Morioka,Koji Shomoto,Satoshi Ueno 대한파킨슨병및이상운동질환학회 2016 Journal Of Movement Disorders Vol.9 No.1
Objective Galvanic vestibular stimulation (GVS) activates the vestibular afferents, and these changes in vestibular input exert a strong influence on the subject’s posture or standing balance. In patients with Parkinson’s disease (PD), vestibular dysfunction might contribute to postural instability and gait disorders. Methods Current intensity was increased to 0.7 mA, and the current was applied to the patients for 20 minutes. To perform a sham stimulation, the current intensity was increased as described and then decreased to 0 mA over the course of 10 seconds. The patient’s status was recorded continuously for 20 minutes with the patient in the supine position. Results Three out of 5 patients diagnosed with PD with postural instability and/or abnormal axial posture showed a reduction in postural instability after GVS. The score for item 12 of the revised Unified Parkinson’s Disease Rating Scale part 3 was decreased in these patients. Conclusions The mechanism of postural instability is complex and not completely understood. In 2 out of the 5 patients, postural instability was not changed in response to GVS. Nonetheless, the GVS-induced change in postural instability for 3 patients in our study suggests that GVS might be a therapeutic option for postural instability
The Way to Make Student Project Activity Successful
Takao Hanabusa,Masaki Konishi,Satoshi Kiriyama 한국공학교육학회 2014 공학교육연구 Vol.17 No.5
Student independent project activity is beneficial for enhancing many kinds of abilities, e.g., team working, collaboration,communication, presentation, creativity, leadership, and so on. More than ten project teams actively perform every year in the Centerfor Innovation and Creativity Development of The University of Tokushima. The project management workshop was planned in order tomake project activity successful. In this workshop, the team members studied the importance of holding a common objective amongthem and of making a clear plan for achieving the activity. They practiced brainstorming method and KJ method and experienced a PDCAcycle. The team activity will be fruitful on the basis of the project management method.
Increased Signal in the Superior Cerebellar Peduncle of Patients with Progressive Supranuclear Palsy
Hiroshi Kataoka,Yukako Nishimori,Takao Kiriyama,Hitoki Nanaura,Tesseki Izumi,Nobuyuki Eura,Naoki Iwasa,Kazuma Sugie 대한파킨슨병및이상운동질환학회 2019 Journal Of Movement Disorders Vol.12 No.3
The provisional diagnosis of progressive supranuclear palsy (PSP) depends on a combination of typical clinical features and specific MRI findings, such as atrophy of the tegmentum in the midbrain. Atrophy of the superior cerebellar peduncle (SCP) distinguishes PSP from other types of parkinsonism. Histological factors affect the conventional fluid-attenuated inversion recovery (FLAIR) signals, such as the extent of neuronal loss and gliosis.
Takahashi, A.,Yasuda, A.,Kaneda, H.,Kawada, M.,Kiriyama, Y.,Mouri, A.,Mori, T.,Okada, Y.,Takahashi, H. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We present the results of far-infrared spectroscopic observations of the Large Magellanic Cloud (LMC) with FIS-FTS. We covered a large area across the LMC, including 30 Doradus (30 Dor) and N44 star-forming regions, by 191 pointings in total. As a result, we detect the [OIII] and [CII] line emission as well as far-infrared dust continuum emission throughout the LMC. We find that the [OIII] emission is widely distributed around 30 Dor. The observed size of the distribution is too large to be explained by massive stars in 30 Dor, which are assumed to be enshrouded by clouds with the constant gas density estimated from the [OIII] line intensities. Therefore the surrounding structure is likely to be highly clumpy. We also find a global correlation between the [OIII] and the far-infrared continuum emission, suggesting that the gas and dust are well mixed in the highly-ionized region where the dust survives in clumpy dense clouds shielded from energetic photons. Furthermore we find that the ratios of [CII]/CO are as high as 110,000 in 30 Dor, and 45,000 even on average, while they are typically 6,000 for star-forming regions in our Galaxy. The unusually high [CII]/CO is also consistent with the picture of clumpy small dense clouds.