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927 results on '"Ogawa, Daisuke"'

3. A Transponder Aggregator with Efficient Use of Filtering Function for Transponder Noise Suppression

Author

Suzuki, Kenya, Moriwaki, Osamu, Hadama, Koichi, Yamaguchi, Keita, Taniguchi, Hiroki, Kisaka, Yoshiaki, Ogawa, Daisuke, Takeshita, Makoto, Camatel, Stefano, Ma, Yiran, and Fukutoku, Mitsunori

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

Colorless, directionless, and contentionless reconfigurable optical add/drop multiplexing (CDC-ROADM) provides highly flexible physical layer network configuration. Such CDC-ROADM must operate in multiple wavelength bands which are being increasingly implemented in optical transmission systems. The operation in C+L bands requires switch devices used in CDC-ROADM to also be capable of multiband operation. Recent studies on wavelength division multiplexing (WDM) systems have pointed out the impact of amplified spontaneous emission (ASE) noise generated by signals of different wavelengths, which causes OSNR degradation. Therefore, it is desirable to filter out the ASE noise from different transponders when multiplexing multiple wavelengths at the transmitter side, especially in a system with non-wavelength selective combiners such as directional couplers and multicast switches. The use of transponder aggregators with filtering functions, such as the M x N wavelength selective switch (WSS), is preferable for this filtering. However, the downside of these devices is that it is difficult to provide economical multiband support. Therefore, we propose an economical transponder aggregator configuration by allowing a certain amount of ASE superposition and reducing the number of filtering functions. In this paper, we fabricated a prototype of the proposed transponder aggregator by combining silica-based planar lightwave circuit technology and C+L band WSS, both commercially available, and verified its feasibility through transmission experiments. The novel transponder aggregator is a practical solution for a multiband CDC-ROADM system with improved OSNR performance., Comment: 10 pages, 11 figures. Submitted to IEEE Journal of Lightwave Technology for possible publication

Published
2022
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7. First demonstration of C + L band CDCROADM with simple node configuration using multiband switching devices

Author

Yamamoto, Shuto, Taniguchi, Hiroki, Kisaka, Yoshiaki, Camatel, Stefano, Ma, Yiran, Ogawa, Daisuke, Hadama, Koichi, Fukutoku, Mitsunori, Goh, Takashi, and Suzuki, Kenya

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

While ultrahigh-baud-rate optical signals are effective for extending the transmission distance of large capacity signals, they also reduce the number of wavelengths that can be arranged in a band because of their wider bandwidth. This reduces the flexibility of optical path configuration in reconfigurable optical add/drop multiplexing (ROADM) networks. In colorless, directionless and contentionless (CDC)-ROADM in particular, the effect reduces the add/drop ratio at a node. Multiband ROADM systems are an effective countermeasure for overcoming this issue, but they make the node configuration more complicated and its operation more difficult. In this paper, we analyze the challenges of C + L band CDC-ROADM and show that optical switch devices that operate over multiple bands are effective in meeting them. For this purpose, we built a C + L band CDC-ROADM node based on C + L band wavelength selective switches (WSSs) and multicast switches (MCSs) and confirmed its effectiveness experimentally. In particular, to simplify the node configuration, we propose a reduction in the number of optical amplifiers used for node loss compensation and experimentally verify its feasibility., Comment: 10 pages, 9 figures

Published
2021
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9. Improved Activity Forecasting for Generating Trajectories

Author

Ogawa, Daisuke, Tamaki, Toru, Hirakawa, Tsubasa, Raytchev, Bisser, Kaneda, Kazufumi, and Yoda, Ken

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

An efficient inverse reinforcement learning for generating trajectories is proposed based of 2D and 3D activity forecasting. We modify reward function with $L_p$ norm and propose convolution into value iteration steps, which is called convolutional value iteration. Experimental results with seabird trajectories (43 for training and 10 for test), our method is best in terms of MHD error and performs fastest. Generated trajectories for interpolating missing parts of trajectories look much similar to real seabird trajectories than those by the previous works., Comment: The 2019 International Workshop on Frontiers of Computer Vision (IW-FCV2019)

Published
2019

10. Semantic segmentation of trajectories with improved agent models for pedestrian behavior analysis

Author

Tamaki, Toru, Ogawa, Daisuke, Raytchev, Bisser, and Kaneda, Kazufumi

Subjects
Computer Science - Computer Vision and Pattern Recognition, Computer Science - Machine Learning
Abstract

In this paper, we propose a method for semantic segmentation of pedestrian trajectories based on pedestrian behavior models, or agents. The agents model the dynamics of pedestrian movements in two-dimensional space using a linear dynamics model and common start and goal locations of trajectories. First, agent models are estimated from the trajectories obtained from image sequences. Our method is built on top of the Mixture model of Dynamic pedestrian Agents (MDA); however, the MDA's trajectory modeling and estimation are improved. Then, the trajectories are divided into semantically meaningful segments. The subsegments of a trajectory are modeled by applying a hidden Markov model using the estimated agent models. Experimental results with a real trajectory dataset show the effectiveness of the proposed method as compared to the well-known classical Ramer-Douglas-Peucker algorithm and also to the original MDA model.

Published
2019
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14. Semantic segmentation of trajectories with agent models

Author

Ogawa, Daisuke, Tamaki, Toru, Raytchev, Bisser, and Kaneda, Kazufumi

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

In many cases, such as trajectories clustering and classification, we often divide a trajectory into segments as preprocessing. In this paper, we propose a trajectory semantic segmentation method based on learned behavior models. In the proposed method, we learn some behavior models from video sequences. Next, using learned behavior models and a hidden Markov model, we segment a trajectory into semantic segments. Comparing with the Ramer-Douglas-Peucker algorithm, we show the effectiveness of the proposed method., Comment: in Proc of FCV2018, 21/Feb/2018

Published
2018

16. Antiferromagnetic coupling in ferrimagnetic Mn4N-based bilayer structures.

Author

Yasuda, Tomohiro, Ogawa, Daisuke, Amemiya, Kenta, and Suemasu, Takashi

Subjects
*KERR magneto-optical effect, *ANOMALOUS Hall effect, *MOLECULAR beam epitaxy, *MAGNETIC circular dichroism, *MAGNETIC moments
Abstract

Mn4N/(Mn,Cu)4N epitaxial bilayer structures with (Mn,Cu)4N compositions below and above the magnetization compensation composition were prepared on SrTiO3(001) substrates by molecular beam epitaxy. The thickness of the (Mn,Cu)4N layer was fixed at approximately 20 nm, while that of the Mn4N layer was changed from 7.5 to 19.6 nm. Cross-sectional elemental mapping proved that the diffusion of Cu from the (Mn,Cu)4N layer to the Mn4N layer was negligible. The magnetization curves showed that the magnetic moments of Mn4N and (Mn,Cu)4N were antiferromagnetically coupled, independent of the Mn4N film thickness, indicating a synthetic ferrimagnetic structure. The dependence of magnetic order on Mn4N film thickness was confirmed by surface-sensitive measurements using polar magneto-optical Kerr effect and x-ray magnetic circular dichroism. This is due to the change in the layer with dominant magnetization and the strength of the antiferromagnetic coupling. The temperature dependence of the anomalous Hall effect showed that the antiferromagnetic coupling was retained in the Mn4N(7.5 nm)/(Mn,Cu)4N(22.4 nm) structure over a wide temperature range of 10–350 K. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Double-decker CDC-ROADM node for multi-band network with wavelength band granularity

Author

Suzuki, Kenya, primary, Ota, Masashi, additional, Morimoto, Yoshie, additional, Yamaguchi, Keita, additional, Hamaoka, Fukutaro, additional, Sugawara, Shuto, additional, Sasai, Takeo, additional, Kobayashi, Takayuki, additional, Nakamura, Masanori, additional, Katayose, Satomi, additional, Umeki, Takeshi, additional, Ogawa, Daisuke, additional, Ma, Yiran, additional, Camatel, Stefano, additional, Fukutoku, Mitsunori, additional, Miyamoto, Yutaka, additional, and Moriwaki, Osamu, additional

Published
2024
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21. 10213-GMC-16 A DECADE REVIEW: BEVACIZUMAB'S IMPACT ON GLIOBLASTOMA TREATMENT

Author

Miyake, Keisuke, primary, Yamauchi, Yutaka, additional, Fuke, Tomono, additional, Tatano, Masaki, additional, Ishikawa, Momo, additional, Kanda, Takahiro, additional, Suzuki, Kenta, additional, Fujimori, Takeshi, additional, Toyota, Yasunori, additional, Ogawa, Daisuke, additional, Hatakeyama, Tetsuhiro, additional, Okauchi, Masanobu, additional, and Kawanishi, Masahiko, additional

Published
2023
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23. Patient vulnerability is associated with poor prognosis following upfront hepatectomy for colorectal liver metastasis

Author

Mima, Kosuke, primary, Hayashi, Hiromitsu, additional, Adachi, Yuki, additional, Tajiri, Takuya, additional, Ofuchi, Takashi, additional, Kanemitsu, Kosuke, additional, Ogawa, Daisuke, additional, Yumoto, Shinsei, additional, Matsumoto, Takashi, additional, Itoyama, Rumi, additional, Kitano, Yuki, additional, Nakagawa, Shigeki, additional, Okabe, Hirohisa, additional, and Baba, Hideo, additional

Published
2023
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27. Rare allele of a previously unidentified histone H4 acetyltransferase enhances grain weight, yield, and plant biomass in rice

Author

Song, Xian Jun, Kuroha, Takeshi, Ayano, Madoka, Furuta, Tomoyuki, Nagai, Keisuke, Komeda, Norio, Segami, Shuhei, Miura, Kotaro, Ogawa, Daisuke, Kamura, Takumi, Suzuki, Takamasa, Higashiyama, Tetsuya, Yamasaki, Masanori, Mori, Hitoshi, Inukai, Yoshiaki, Wu, Jianzhong, Kitano, Hidemi, Sakakibara, Hitoshi, Jacobsen, Steven E, and Ashikari, Motoyuki

Subjects
Genetics, Alleles, Biomass, Cell Count, Cell Nucleus, Cloning, Molecular, Gene Expression Regulation, Plant, Genes, Plant, Histone Acetyltransferases, Humans, Molecular Sequence Data, Oryza, Plant Proteins, Promoter Regions, Genetic, Quantitative Trait Loci, Seeds, grain size, weight, yield, plant biomass, rice
Abstract

Grain weight is an important crop yield component; however, its underlying regulatory mechanisms are largely unknown. Here, we identify a grain-weight quantitative trait locus (QTL) encoding a new-type GNAT-like protein that harbors intrinsic histone acetyltransferase activity (OsglHAT1). Our genetic and molecular evidences pinpointed the QTL-OsglHAT1's allelic variations to a 1.2-kb region upstream of the gene body, which is consistent with its function as a positive regulator of the traits. Elevated OsglHAT1 expression enhances grain weight and yield by enlarging spikelet hulls via increasing cell number and accelerating grain filling, and increases global acetylation levels of histone H4. OsglHAT1 localizes to the nucleus, where it likely functions through the regulation of transcription. Despite its positive agronomical effects on grain weight, yield, and plant biomass, the rare allele elevating OsglHAT1 expression has so far escaped human selection. Our findings reveal the first example, to our knowledge, of a QTL for a yield component trait being due to a chromatin modifier that has the potential to improve crop high-yield breeding.

Published
2015

30. Prognostic Value of Preoperative Geriatric Nutritional Risk Index in Intrahepatic Cholangiocarcinoma After Hepatectomy: A Single ‑ Center Retrospective Cohort Study

Author

Ogawa, Daisuke, primary, Miyata, Tatsunori, additional, Yumoto, Shinsei, additional, Shiraishi, Yuta, additional, Matsumoto, Takashi, additional, Takematsu, Toru, additional, Tsukamoto, Masayo, additional, Nakagawa, Shigeki, additional, Mima, Kosuke, additional, Nitta, Hidetoshi, additional, Hayashi, Hiromitsu, additional, and Baba, Hideo, additional

Published
2023
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34. A Prospective Study of Intensity-modulated Radiation Therapy Using a Standard Radiation Dose for High-grade Glioma

Author

TAKAHASHI, SHIGEO, MIYAKE, KEISUKE, OGAWA, DAISUKE, ANADA, MASAHIDE, KINOSHITA, TOSHIFUMI, NISHIDE, TAKAMASA, and SHIBATA, TORU

Subjects
Research Article
Abstract

Background/Aim: We evaluated the treatment outcomes of intensity-modulated radiation therapy (IMRT) using a standard radiation dose in patients with high-grade glioma (HGG). Patients and Methods: We conducted a prospective, single-institutional, single-arm trial. Patients aged 20-75 years with histologically proven HGG were enrolled. Surgical procedures and chemotherapy regimens were not regulated. The prescribed dose of postoperative IMRT was 60 Gy in 30 fractions over six weeks. The primary endpoint was overall survival (OS). Secondary endpoints were progression-free survival (PFS), completion rate of IMRT, and Grade 3 or higher non-hematological toxicity. Results: Between 2016 and 2019, 20 patients were enrolled. According to the World Health Organization 2016 Classification, glioblastoma, anaplastic astrocytoma, and anaplastic oligodendroglioma were present in nine, six, and five of the recruited patients, respectively. Gross total resection, partial resection, and biopsy were performed in four, nine, and seven patients, respectively. All patients received concurrent and adjuvant chemotherapy using temozolomide with or without bevacizumab. The completion rate of IMRT was 100%. The median follow-up period was 29 months (range=6-68 months). Median OS and PFS were 30 and 14 months, respectively. No patients experienced Grade 3 or higher non-hematological toxicity. The 2-year OS rates were 100%, 57%, and 33% in Radiation Therapy Oncology Group-Recursive Partitioning Analysis (RTOG-RPA) classes I/II, IV, and V, respectively (p=0.002; log-rank test). Conclusion: IMRT using the standard radiation dose in patients with HGG can be carried out safely. RTOG-RPA class appears to be useful to estimate patient prognoses.

Published
2023

37. FMISO-PET and immunohistochemistry verified tumor oxygenation, stemness, and immunosupportive microenvironment after preoperative neoadjuvant bevacizumab for newly diagnosed glioblastoma

Author

Suzuki, Tomoya, primary, Takei, Jun, additional, Fukasawa, Nei, additional, Suzuki, Kenta, additional, Ogawa, Daisuke, additional, Yamamoto, Yohei, additional, Akasaki, Yasuharu, additional, Murayama, Yuichi, additional, Shimoda, Masayuki, additional, Miyake, Keisuke, additional, and Tanaka, Toshihide, additional

Published
2023
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38. Abstract 2239: Investigation of the molecular biological significance of YAP/TAZ expression in PNEN

Author

Shiraishi, Yuta, primary, Hayashi, Hiromitsu, additional, Ogawa, Daisuke, additional, Yumoto, Shinsei, additional, Sato, Hiroki, additional, Matsumoto, Takashi, additional, Takematsu, Toru, additional, Maruno, Masataka, additional, Tsukamoto, Masayo, additional, Miyata, Tatsunori, additional, Nakagawa, Shigeki, additional, Mima, Kosuke, additional, Nitta, Hidetoshi, additional, and Baba, Hideo, additional

Published
2023
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42. Reconfigurable Photonic Crystal Reversibly Exhibiting Single and Double Structural Colors.

Author

Zhan, Yi‐Yang, Ogawa, Daisuke, Sano, Koki, Wang, Xiang, Araoka, Fumito, Sakai, Nobuyuki, Sasaki, Takayoshi, and Ishida, Yasuhiro

Subjects
*STRUCTURAL colors, *PHOTONIC crystals, *OTOACOUSTIC emissions, *STRUCTURAL design, *PIGMENTS
Abstract

Unlike absorption‐based colors of dyes and pigments, reflection‐based colors of photonic crystals, so called "structural colors", are responsive to external stimuli, but can remain unfaded for over ten million years, and therefore regarded as a next‐generation coloring mechanism. However, it is a challenge to rationally design the spectra of structural colors, where one structure gives only one reflection peak defined by Bragg's law, unlike those of absorption‐based colors. Here, we report a reconfigurable photonic crystal that exhibits single‐peak and double‐peak structural colors. This photonic crystal is composed of a colloidal nanosheet in water, which spontaneously adopts a layered structure with single periodicity (407 nm). After a temperature‐gradient treatment, the photonic crystal segregates into two regions with shrunken (385 nm) and expanded (448 nm) periodicities, and thus exhibits double reflection peaks that are blue‐ and red‐shifted from the original one, respectively. Notably, the transition between the single‐peak and double‐peak states is reversible. [ABSTRACT FROM AUTHOR]

Published
2023
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43. Nationwide multicenter kidney biopsy study of Japanese patients with hypertensive nephrosclerosis

Author

Furuichi, Kengo, Shimizu, Miho, Yuzawa, Yukio, Hara, Akinori, Toyama, Tadashi, Kitamura, Hiroshi, Suzuki, Yoshiki, Sato, Hiroshi, Uesugi, Noriko, Ubara, Yoshifumi, Hoshino, Junichi, Hisano, Satoshi, Ueda, Yoshihiko, Nishi, Shinichi, Yokoyama, Hitoshi, Nishino, Tomoya, Kohagura, Kentaro, Ogawa, Daisuke, Mise, Koki, Shibagaki, Yugo, Kimura, Kenjiro, Haneda, Masakazu, Makino, Hirofumi, Matsuo, Seiichi, Wada, Takashi, and Research Group of Diabetic Nephropathy and Nephrosclerosis, Ministry of Health, Labour and Welfare of Japan, and Japan Agency for Medical Research and Development

Published
2018
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44. Clinicopathological analysis of biopsy-proven diabetic nephropathy based on the Japanese classification of diabetic nephropathy

Author

Furuichi, Kengo, Shimizu, Miho, Yuzawa, Yukio, Hara, Akinori, Toyama, Tadashi, Kitamura, Hiroshi, Suzuki, Yoshiki, Sato, Hiroshi, Uesugi, Noriko, Ubara, Yoshifumi, Hohino, Junichi, Hisano, Satoshi, Ueda, Yoshihiko, Nishi, Shinichi, Yokoyama, Hitoshi, Nishino, Tomoya, Kohagura, Kentaro, Ogawa, Daisuke, Mise, Koki, Shibagaki, Yugo, Makino, Hirofumi, Matsuo, Seiichi, Wada, Takashi, and Research Group of Diabetic Nephropathy, Ministry of Health, Labour and Welfare of Japan, and Japan Agency for Medical Research and Development

Published
2018
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45. Decline in estimated glomerular filtration rate is associated with risk of end-stage renal disease in type 2 diabetes with macroalbuminuria: an observational study from JDNCS

Author

Shimizu, Miho, Furuichi, Kengo, Toyama, Tadashi, Funamoto, Tomoaki, Kitajima, Shinji, Hara, Akinori, Ogawa, Daisuke, Koya, Daisuke, Ikeda, Kenzo, Koshino, Yoshitaka, Kurokawa, Yukie, Abe, Hideharu, Mori, Kiyoshi, Nakayama, Masaaki, Konishi, Yoshio, Samejima, Ken-ichi, Matsui, Masaru, Yamauchi, Hiroyuki, Gohda, Tomohito, Fukami, Kei, Nagata, Daisuke, Yamazaki, Hidenori, Yuzawa, Yukio, Suzuki, Yoshiki, Fujimoto, Shouichi, Maruyama, Shoichi, Kato, Sawako, Naito, Takero, Yoshimura, Kenichi, Yokoyama, Hitoshi, Wada, Takashi, and Research Group of Diabetic Nephropathy, the Ministry of Health, Labour, and Welfare of Japan and Japan Agency for Medical Research and Development

Published
2018
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46. Supplementary Figure 5 from Extracellular Vesicles Modulate the Glioblastoma Microenvironment via a Tumor Suppression Signaling Network Directed by miR-1

Author

Bronisz, Agnieszka, primary, Wang, Yan, primary, Nowicki, Michal O., primary, Peruzzi, Pierpaolo, primary, Ansari, Khairul I., primary, Ogawa, Daisuke, primary, Balaj, Leonora, primary, De Rienzo, Gianluca, primary, Mineo, Marco, primary, Nakano, Ichiro, primary, Ostrowski, Michael C., primary, Hochberg, Fred, primary, Weissleder, Ralph, primary, Lawler, Sean E., primary, Chiocca, E. Antonio, primary, and Godlewski, Jakub, primary

Published
2023
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47. Data from Extracellular Vesicles Modulate the Glioblastoma Microenvironment via a Tumor Suppression Signaling Network Directed by miR-1

Author

Bronisz, Agnieszka, primary, Wang, Yan, primary, Nowicki, Michal O., primary, Peruzzi, Pierpaolo, primary, Ansari, Khairul I., primary, Ogawa, Daisuke, primary, Balaj, Leonora, primary, De Rienzo, Gianluca, primary, Mineo, Marco, primary, Nakano, Ichiro, primary, Ostrowski, Michael C., primary, Hochberg, Fred, primary, Weissleder, Ralph, primary, Lawler, Sean E., primary, Chiocca, E. Antonio, primary, and Godlewski, Jakub, primary

Published
2023
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48. Supplementary Figure 2 from Extracellular Vesicles Modulate the Glioblastoma Microenvironment via a Tumor Suppression Signaling Network Directed by miR-1

Author

Bronisz, Agnieszka, primary, Wang, Yan, primary, Nowicki, Michal O., primary, Peruzzi, Pierpaolo, primary, Ansari, Khairul I., primary, Ogawa, Daisuke, primary, Balaj, Leonora, primary, De Rienzo, Gianluca, primary, Mineo, Marco, primary, Nakano, Ichiro, primary, Ostrowski, Michael C., primary, Hochberg, Fred, primary, Weissleder, Ralph, primary, Lawler, Sean E., primary, Chiocca, E. Antonio, primary, and Godlewski, Jakub, primary

Published
2023
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49. Supplementary Table 2 from Extracellular Vesicles Modulate the Glioblastoma Microenvironment via a Tumor Suppression Signaling Network Directed by miR-1

Author

Bronisz, Agnieszka, primary, Wang, Yan, primary, Nowicki, Michal O., primary, Peruzzi, Pierpaolo, primary, Ansari, Khairul I., primary, Ogawa, Daisuke, primary, Balaj, Leonora, primary, De Rienzo, Gianluca, primary, Mineo, Marco, primary, Nakano, Ichiro, primary, Ostrowski, Michael C., primary, Hochberg, Fred, primary, Weissleder, Ralph, primary, Lawler, Sean E., primary, Chiocca, E. Antonio, primary, and Godlewski, Jakub, primary

Published
2023
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50. Supplementary Figure 1 from Extracellular Vesicles Modulate the Glioblastoma Microenvironment via a Tumor Suppression Signaling Network Directed by miR-1

Author

Bronisz, Agnieszka, primary, Wang, Yan, primary, Nowicki, Michal O., primary, Peruzzi, Pierpaolo, primary, Ansari, Khairul I., primary, Ogawa, Daisuke, primary, Balaj, Leonora, primary, De Rienzo, Gianluca, primary, Mineo, Marco, primary, Nakano, Ichiro, primary, Ostrowski, Michael C., primary, Hochberg, Fred, primary, Weissleder, Ralph, primary, Lawler, Sean E., primary, Chiocca, E. Antonio, primary, and Godlewski, Jakub, primary

Published
2023
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