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912 results on '"Kumagai, Naoya"'

1. Chance-Constrained Gaussian Mixture Steering to a Terminal Gaussian Distribution

Author

Kumagai, Naoya and Oguri, Kenshiro

Subjects
Mathematics - Optimization and Control
Abstract

We address the problem of finite-horizon control of a discrete-time linear system, where the initial state distribution follows a Gaussian mixture model, the terminal state must follow a specified Gaussian distribution, and the state and control inputs must obey chance constraints. We show that, throughout the time horizon, the state and control distributions are fully characterized by Gaussian mixtures. We then formulate the cost, distributional terminal constraint, and affine/2-norm chance constraints on the state and control, as convex functions of the decision variables. This is leveraged to formulate the chance-constrained path planning problem as a single convex optimization problem. A numerical example demonstrates the effectiveness of the proposed method., Comment: Accepted to 2024 Conference on Decision and Control (CDC)

Published
2024

2. Proposal for Packaging Evaluation Methodology Based on Eye-Tracking and Affective Evaluation

Author

Ohtsuka, Shuma, Kumagai, Naoya, Sugaya, Midori, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Marcus, Aaron, editor, Rosenzweig, Elizabeth, editor, and Soares, Marcelo M., editor

Published
2024
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3. Reflection of Individual Differences on Emotion Map for Kansei Evaluation of Packaging Design with Physiological Indexes

Author

Kumagai, Naoya, Nakagawa, Yuri, Feng, Chen, Sugaya, Midori, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Schmorrow, Dylan D., editor, and Fidopiastis, Cali M., editor

Published
2024
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4. SCALER: A Tough Versatile Quadruped Free-Climber Robot

Author

Tanaka, Yusuke, Shirai, Yuki, Lin, Xuan, Schperberg, Alexander, Kato, Hayato, Swerdlow, Alexander, Kumagai, Naoya, and Hong, Dennis

Subjects
Computer Science - Robotics
Abstract

This paper introduces SCALER, a quadrupedal robot that demonstrates climbing on bouldering walls, overhangs, ceilings and trotting on the ground. SCALER is one of the first high-degrees of freedom four-limbed robots that can free-climb under the Earth's gravity and one of the most mechanically efficient quadrupeds on the ground. Where other state-of-the-art climbers specialize in climbing, SCALER promises practical free-climbing with payload \textit{and} ground locomotion, which realizes true versatile mobility. A new climbing gait, SKATE gait, increases the payload by utilizing the SCALER body linkage mechanism. SCALER achieves a maximum normalized locomotion speed of $1.87$ /s, or $0.56$ m/s on the ground and $1.0$ /min, or $0.35$ m/min in bouldering wall climbing. Payload capacity reaches $233$ % of the SCALER weight on the ground and $35$ % on the vertical wall. Our GOAT gripper, a mechanically adaptable underactuated two-finger gripper, successfully grasps convex and non-convex objects and supports SCALER., Comment: Proceeding to IROS 2022, Preprint and not a final version

Published
2022

8. Recent Advances in Quinoline-Based Macrocycles: Synthesis, Properties, and Applications in Catalytic Reactions.

Author

Xu, Wei and Kumagai, Naoya

Subjects
*LIFE sciences, *CHEMICAL processes, *MACROCYCLIC compounds, *ORGANIC chemistry, *CYCLIC compounds, *MATERIALS science, *TRANSITION metal complexes
Abstract

This article provides an overview of recent advancements in quinoline-based macrocycles, which are large ring-shaped compounds with various applications. The focus is on nitrogen-containing macrocycles, such as porphyrins, and their functional properties, including photophysical characteristics, host-guest chemistry, and catalytic reactions. The authors specifically discuss three quinoline-based macrocycles: TriQuinoline (TQ), oxa-TriQuinoline (o-TQ), and TEtraQuinoline (TEQ), examining their structures, synthesis, and properties. The article also explores potential applications of these macrocycles in DNA intercalation, catalytic dehydrogenative oxidation, and gem-difluoroalkenylation reactions. Furthermore, the article delves into the synthesis and properties of tetrameric quinoline macrocycles (TEQ), which have a rigid saddle-shaped structure and can form metal complexes with transition metal cations. The authors also discuss modifications of TEQ and its fluorescence properties. Additionally, the article touches on larger quinoline-based macrocycles with bridges and their synthesis, highlighting their potential applications in organometallic chemistry and supramolecular chemistry. Overall, the chemistry of quinoline macrocycles is an evolving field with opportunities for further research and applications. [Extracted from the article]

Published
2024
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9. In2Q2: A New Entry of 16‐Membered Tetraazamacrocycle Concatenating Indole and Quinoline Units.

Author

Kihara, Kazuki, Kobayashi, Toi, Xu, Wei, and Kumagai, Naoya

Subjects
INDOLE, SOLID solutions, DIAMIDES, QUINOLINE
Abstract

A new family of 16‐membered macrocycles comprising two indole (In) and two quinoline (Q) units, coined In2Q2, was synthesized. Each unit is diagonally located and concatenated in a head‐to‐tail fashion, furnishing a non‐flat saddle‐shaped architecture with C2 symmetry. The synthetic protocol utilizing macrocyclic diamide as a pivotal precursor allowed us to access a series of In2Q2 derivatives bearing various substituents on the periphery. The In2Q2 derivatives and their Zn2+ complexes were emissive in both solution phase and solid state. While the entire architecture of In2Q2 is similar to that of quinoline tetramer TEtraQuinoline, a couple of contrasting physicochemical properties were revealed. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Chiral Bimetallic Lewis Acids

Author

Shibasaki, Masakatsu, Kumagai, Naoya, Beller, M., Editorial Board Member, Dixneuf, P. H., Editorial Board Member, Dupont, J., Editorial Board Member, Fürstner, A., Editorial Board Member, Glorius, F., Editorial Board Member, Gooßen, L. J., Editorial Board Member, Ikariya, T., Editorial Board Member, Nolan, S. P., Editorial Board Member, Okuda, J., Editorial Board Member, Oro, L. A., Editorial Board Member, Willis, M., Editorial Board Member, Zhou, Q.-L., Editorial Board Member, Mikami, Koichi, editor, Brill, M., Book Editor, Deng, Y., Book Editor, Doyle, M. P., Book Editor, Feng, X., Book Editor, Hatano, M., Book Editor, Ishihara, K., Book Editor, Kobayashi, S., Book Editor, Kumagai, N., Book Editor, Liu, X., Book Editor, Paradies, J., Book Editor, Sha, Q., Book Editor, Shibasaki, M., Book Editor, Tsubogo, T., Book Editor, Wang, Z., Book Editor, and Yamashita, Y., Book Editor

Published
2018
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19. Vasopressin Expressed in Hypothalamic CRF Neurons Causes Impaired Water Diuresis in Secondary Adrenal Insufficiency

Author

Yamagata, Satoshi, primary, Talukder, Ashraf H, additional, Murasawa, Shingo, additional, Niioka, Kanako, additional, Kumagai, Naoya, additional, Takagi, Mao, additional, Kawamura, Meiko, additional, Natsume, Rie, additional, Abe, Manabu, additional, Uchida, Katsuya, additional, Sato, Tatsuya, additional, Kurose, Akira, additional, Kageyama, Kazunori, additional, Daimon, Makoto, additional, Sakimura, Kenji, additional, and Itoi, Keiichi, additional

Published
2023
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27. Chemoselective Catalytic Dehydrogenation of Benzylic Amines Driven by the TEtraQuinoline/FeCl2 Complex.

Author

Nishiwaki, Mizuki, Xu, Wei, and Kumagai, Naoya

Subjects
BENZYL group, AMINES, CARBON-carbon bonds, SECONDARY amines, CATALYTIC dehydrogenation, IMINES
Abstract

A chemoselective dehydrogenation protocol for benzylic amines catalyzed by the TEtraQuinoline (TEQ)/FeCl2 complex is described. In combination with 2 equiv of tert‐butyl hydroperoxide, as little as 0.1 mol% of catalyst loading was sufficient to convert primary and secondary benzylic amines to the corresponding imines and dimerized imines, respectively. Subsequent hydrolysis of the imines allowed for removal of the benzyl group on the nitrogen atom. Nonaromatic carbon‐carbon multiple bonds and the O‐Bn group remained intact in the present protocol, providing a complementary deprotection procedure to reductive removal conditions exerted by Pd catalysis. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Peripheral Modification of Tripodal Aza-Oxa-Crown Oxa-TriQuinoline

Author

Kobayashi, Toi, Sakurai, Takuya, and Kumagai, Naoya

Abstract

Oxa-TriQuinoline (o-TQ) is a new entry in the collection of aza-oxa-crown compounds featuring a semi-rigid flexible conformation and a tripodal ligation capability through three quinoline units. Herein, we describe the installation of functional groups and aromatic substituents on the outer edge of o-TQ to modulate its physicochemical properties. Amino and bromo substituents were regioselectively introduced at the 5-position, forming bowl-shaped Cu(I) complexes in which three quinoline units coordinated to Cu(I). X-ray crystallography indicated that these o-TQ derivatives preferred an almost identical geometry in both the absence and presence of Cu(I). In contrast to o-TQ, some new o-TQ derivatives exhibited photoluminescent properties in solution and/or in the solid state depending on the substituents.Oxa-TriQuinoline (o-TQ) is a new entry in the collection of aza-oxa-crown compounds. Herein, we synthesized new derivatives bearing functional groups and aromatic substituents on the periphery of o-TQ architecture. While these derivatives preferred an almost identical geometry in both the absence and presence of Cu(I), some of them exhibited photoluminescent properties in solution and/or in the solid state.

Published
2023
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41. Expeditious Access to the B3NO2Heterocycle Enabling Modular Derivatization

Author

Tsutsumi, Ryosuke, Kashiwagi, Nobuaki, and Kumagai, Naoya

Abstract

DATB (1,3-dioxa-5-aza-2,4,6-triborinane) is a unique six-membered heterocycle exhibiting proficient catalytic activity in direct dehydrative amidation. Reported herein is an improved synthetic protocol for DATB derivatives featuring a concise two-step chromatography-free process. Suzuki–Miyaura coupling assembled 2,6-dibromoaniline derivatives and 1,2-phenylenediboronic acid to afford dimeric B-spiroborate salts. Acidic untying of the spiroborates gave rise to the DATB ring system with various substituents.

Published
2023
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