Search Results - "Akihisa Tamura"

Recent progress on integrally convex functions by Murota, Kazuo, Tamura, Akihisa

“…Integrally convex functions constitute a fundamental function class in discrete convex analysis, including M-convex functions, L-convex functions, and many…”
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Decomposition of an integrally convex set into a Minkowski sum of bounded and conic integrally convex sets by Murota, Kazuo, Tamura, Akihisa

“…Every polyhedron can be decomposed into a Minkowski sum (or vector sum) of a bounded polyhedron and a polyhedral cone. This paper establishes similar…”
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Discrete Fenchel duality for a pair of integrally convex and separable convex functions by Murota, Kazuo, Tamura, Akihisa

“…Discrete Fenchel duality is one of the central issues in discrete convex analysis. The Fenchel-type min–max theorem for a pair of integer-valued M ♮ -convex…”
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Scaling, proximity, and optimization of integrally convex functions by Moriguchi, Satoko, Murota, Kazuo, Tamura, Akihisa, Tardella, Fabio

“…In discrete convex analysis, the scaling and proximity properties for the class of L ♮ -convex functions were established more than a decade ago and have been…”
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Directed discrete midpoint convexity by Tamura, Akihisa, Tsurumi, Kazuya

“…For continuous functions, midpoint convexity characterizes convex functions. By considering discrete versions of midpoint convexity, several types of discrete…”
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Integrality of subgradients and biconjugates of integrally convex functions by Murota, Kazuo, Tamura, Akihisa

“…Integrally convex functions constitute a fundamental function class in discrete convex analysis. This paper shows that an integer-valued integrally convex…”
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Designing Matching Mechanisms under General Distributional Constraints by Goto, Masahiro, Kojima, Fuhito, Kurata, Ryoji, Tamura, Akihisa, Yokoo, Makoto

“…To handle various applications, we study matching under constraints. The only requirement on the constraints is heredity; given a feasible matching, any…”
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Prediction of mobilized hematopoietic stem cell yield in patients with multiple myeloma: Usefulness of whole-body MRI-derived indices by Takasu, Miyuki, Higashino, Ryo, Sueoka, Takahiro, Kawai, Saki, Tanitame, Nobuko, Tamura, Akihisa, Iida, Makoto, Kawase, Takakazu, Ichinohe, Tatsuo, Awai, Kazuo

“…High-dose chemotherapy followed by autologous stem cell transplant is the mainstay of treatment for multiple myeloma (MM). The purpose of this study was to…”
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Trading networks with bilateral contracts by Fleiner, Tamas, Janko, Zsuzsanna, Tamura, Akihisa, Teytelboym, Alexander

“…We study production networks in which firms match and sign bilateral contracts. Firms can buy from and sell to one another directly or via intermediaries. It…”
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Sperner’s lemma and zero point theorems on a discrete simplex and a discrete simplotope by Iimura, Takuya, Murota, Kazuo, Tamura, Akihisa

“…We show two discrete zero point theorems that are derived from Sperner’s lemma and a Sperner-like theorem (van der Laan and Talman…”
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Shapley–Folkman-type theorem for integrally convex sets by Murota, Kazuo, Tamura, Akihisa

“…The Shapley–Folkman theorem is a statement about the Minkowski sum of (non-convex) sets, expressing the closeness of the Minkowski sum to convexity in a…”
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Multiple Myeloma: Microstructural Analysis of Lumbar Trabecular Bones in Patients without Visible Bone Lesions—Preliminary Results by TAKASU, Miyuki, TANI, Chihiro, AWAI, Kazuo, ISHIKAWA, Miho, DATE, Shuji, HORIGUCHI, Jun, KIGUCHI, Masao, TAMURA, Akihisa, SAKAI, Akira, ASAOKU, Hideki, NANGO, Nobuhito

“…To evaluate the accuracy of trabecular analysis of the lumbar spine by using multidetector computed tomography (CT) in differentiating multiple myeloma…”
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Coordinatewise domain scaling algorithm for M-convex function minimization by TAMURA, Akihisa

“…We present a polynomial time scaling algorithm for the minimization of an M-convex function. M-convex functions are nonlinear discrete functions with…”
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SPECT/CT Fusion in the Diagnosis of Hyperparathyroidism by Monzen, Yoshio, Tamura, Akihisa, Okazaki, Hajime, Kurose, Taichi, Kobayashi, Masayuki, Kuraoka, Masatsugu

“…Objective(s): In this study, we aimed to analyze the relationship between the diagnostic ability of fused single photon emission computed tomography/ computed…”
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Designing matching mechanisms under constraints: An approach from discrete convex analysis by Kojima, Fuhito, Tamura, Akihisa, Yokoo, Makoto

“…We consider two-sided matching problems where agents on one side of the market (hospitals) are required to satisfy certain distributional constraints. We show…”
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Application of M-Convex submodular flow problem to mathematical economics by Murota, Kazuo, Tamura, Akihisa

“…This paper considers an economic model in which producers and consumers trade various indivisible commodities through a perfectly divisible commodity, money…”
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Proximity theorems of discrete convex functions by MUROTA, Kazuo, TAMURA, Akihisa

“…A proximity theorem is a statement that, given an optimization problem and its relaxation, an optimal solution to the original problem exists in a certain…”
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Strategyproof Allocation Mechanisms with Endowments and M-convex Distributional Constraints by Suzuki, Takamasa, Tamura, Akihisa, Yahiro, Kentaro, Yokoo, Makoto, Zhang, Yuzhe

“…We consider an allocation problem of multiple types of objects to agents, where each type of object has multiple copies (e.g., multiple seats in a school),…”
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Bifurcation analysis of a simple 3D oscillator and chaos synchronization of its coupled systems by Ueta, Tetsushi, Tamura, Akihisa

“…Tamaševičius et al. proposed a simple 3D chaotic oscillator for educational purpose. In fact the oscillator can be implemented very easily and it shows typical…”
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A fair and truthful mechanism with limited subsidy by Goko, Hiromichi, Igarashi, Ayumi, Kawase, Yasushi, Makino, Kazuhisa, Sumita, Hanna, Tamura, Akihisa, Yokoi, Yu, Yokoo, Makoto

“…The notion of envy-freeness is a natural and intuitive fairness requirement in resource allocation. With indivisible goods, such fair allocations are not…”
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