1,697 research outputs found
On the Impact of Downlink Feedback on LoRa Performance
No full textRecently, the role of Low-Power Wide Area Networks (LPWANs) as enablers of the Internet of Things (IoT) is emerging. However, many concerns arise on the performance of LPWANs if higher Quality of Service (QoS) requirements are needed by certain classes of IoT services. In this work, we will focus on one of the most prominent of these technologies, i.e., Long-Range (LoRa). Our aim is to study to what extent a LoRa network is able to support uplink (UL) traffic that requires to be confirmed by the Network Server (NS). The simulation results show that the network performance is severely impacted by the downlink (DL) traffic generated by feedback packets
Online_Appendix – Supplemental material for Donor Competition and Public Support for Foreign Aid Sanctions
No full textSupplemental material, Online_Appendix for Donor Competition and Public Support for Foreign Aid Sanctions by Masaru Kohno, Gabriella R. Montinola, Matthew S. Winters and Gento Kato in Political Research Quarterly</p
Orbit configuration spaces associated to discrete subgroups of PSL(2,R)
No full textAbstractThe purpose of this article is to analyze several Lie algebras associated to “orbit configuration spaces” obtained from a group G acting freely, and properly discontinuously on the upper half-plane H2. The Lie algebra obtained from the descending central series for the associated fundamental group is shown to be isomorphic, up to a regrading, to 1.the Lie algebra obtained from the higher homotopy groups of analogous constructions associated to H2×Cq modulo torsion, as well as2.the Lie algebra obtained from horizontal chord diagrams for surfaces. The resulting Lie algebras are similar to those studied in [T. Kohno, Linear representations of braid groups and classical Yang-Baxter equations, Contemp. Math. 78 (1988) 339–363; T. Kohno, Vassiliev invariants and de Rham complex on the space of knots, Contemp. Math. 179 (1994) 123–138; T. Kohno, Elliptic KZ system, braid groups of the torus and Vassiliev invariants, Topology and its Applications 78 (1997) 79–94; D.C. Cohen, Monodromy of fiber-type arrangements and orbit configuration spaces, Forum Math. 13 (2001) 505–530; F.R. Cohen, M. Xicoténcatl, On orbit configuration spaces associated to the Gaussian integers: homology and homotopy groups, Topology Appl. 118 (2002) 17–29; E. Fadell and S. Husseini, The space of loops on configuration spaces and the Majer-Terracini index, Topol. Methods Nonlinear Anal. J. Julius Schauder Center 11 (1998), 249–271; E. Fadell and S. Husseini, Geometry and Topology of Configuration Spaces, in: Springer Monographs in Mathematics, Springer-Verlag, 2001; F.R. Cohen and T. Sato, On groups of morphisms of coalgebras, (submitted for publication)]. The structure of a related graded Poisson algebra defined below and obtained from an analogue of the infinitesimal braid relations parametrized by G is also addressed
Applying spatial epidemiology to hematological disease using R: a guide for hematologists and oncologists
No full textKei Kohno,1 Hiroto Narimatsu,2 Katsumi Otani,2 Ri Sho,2 Yosuke Shiono,1 Ikuko Suzuki,1 Yuichi Kato,1 Akira Fukao,2 Takeo Kato,1 1Department of Neurology, Hematology, Metabolism, Endocrinology, and Diabetology, Yamagata University School of Medicine, 2Department of Public Health, Yamagata University Graduate School of Medicine, Yamagata, Japan Abstract: “Spatial statistics” is an academic field that deals with the statistical analysis of spatial data, and has been applied to econometrics and various other policy fields. These methods are easily applied by hematologists and oncologists using better and much less expensive software. To encourage physicians to use these methods, this review introduces the methods and demonstrates the analyses using R and FleXScan, which can be freely downloaded from the website, with sample data. It is demonstrated that spatial analysis can be used by physicians to analyze hematological diseases. In addition, applying the technique presented to the investigation of patient prognoses may enable generation of data that are also useful for solving health policy-related problems, such as the optimal distribution of medical resources. Keywords: leukemia, malignant lymphoma, Tango's index, spatial regression mode
Radio frequency wave interactions with a plasma sheath: the role of wave and plasma sheath impedances
No full textThe accompanying files contain digital data for figures in the article "Radio frequency wave interactions with a plasma sheath: the role of wave and plasma sheath impedances" by J.R. Myra and H. Kohno, to be submitted to the journal Physics of Plasmas.
Abstract:
RF sheaths form near surfaces where plasma and strong RF fields coexist. The effect of these RF sheaths on wave propagation near the boundary can be characterized by an effective sheath impedance that includes both resistive and capacitive contributions describing RF sheath rectification and RF power absorption in the sheath [J. R. Myra and D. A. D'Ippolito, Phys. Plasmas 22, 062507 (2015)]. Here we define a dimensionless parameter, the ratio of incoming wave impedance to the sheath impedance, which determines the characteristics of the interaction, ranging from quasi-conducting to quasi-insulating, or in the case of matched impedances, to a sheath-plasma resonance. A semi-analytical analysis is carried out for electrostatic slow waves in the ion cyclotron range of frequencies (ICRF). For the propagating slow wave case, where the incident wave is partially reflected, the fraction of power dissipated in the sheath is calculated. For the evanescent slow wave case, which admits a sheath-plasma resonance, an amplification factor is calculated. Using the impedance ratio approach, RF sheath interactions are characterized for a range of RF wave and plasma parameters including plasma density, magnetic field angle with respect to the surface, wave frequency and wave-vector components tangent to the surface. For a particularly interesting example case, results are compared with the rfSOL code [H. Kohno and J. R. Myra, Comput. Phys. Commun. 220, 129 (2017)]. Finally electromagnetic effects, absent from the semi-analytical analysis, are assessed.</p
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Comment on “Theory of Current-Driven Domain Wall Motion: Spin Transfer versus Momentum Transfer”
No full textA Comment on the Letter by Gen Tatara and Hiroshi Kohno, Phys. Rev. Lett. 92 086601 (2004). The authors of the Letter offer a Reply.</p
Activity of a peptide deformylase inhibitor LBM415 (NVP PDF-713) tested against recent clinical isolates from Japan
No full textCopyright © The British Society for Antimicrobial Chemotherapy 2005; all rights reserved.Jan M. Bell, John D. Turnidge, Matsuhisa Inoue, Shigeru Kohno, Yoichi Hirakata, Yasuo Ono and Ronald N. Jone
Ultrastructural study on the meninx of the goldfish brain
No full text筑波大学University of Tsukuba博士（医学）Doctor of Philosophy in Medical Sciences1988【要旨】Offprint. Originally published in: Journal of comparative neurology, v. 270, pp. 327-336, 1988Joint authors: Kunio Kohno and Ryuzo Itothesi
Mutational analysis of the estrogen receptor ligand-binding domain: Influence of ligand structure and stereochemistry on transactivation
No full textThe mouse estrogen receptor (mER) exhibits ligand stereochemical specificity for indenestrol A (IA), a stilbestrol estrogen. IA has a chiral C3 methyl group, and the mER preferentially binds the S-enantiomer (IA-S). resulting in elevated biological activity when compared with the IA-R enantiomer. To elucidate the mechanisms for this stereochemical recognition, we have constructed a series of mERs with individual amino acid substitutions at Met521, His528, Met532, and Val537. The abilities of yeast-expressed wild-type and mutant mERs to transactivate an estrogen-responsive reporter gene construct were measured in the presence of diethylstilbestrol (DES) and IA enantiomers. The concentration of IA-S required to induce half-maximal transactivation by wild-type mER was 10-fold lower than IA-R, which is attributed to the 15-fold greater binding affinity for IA-S. Wild-type mER displayed similar dose-response curves for IA-R and demethyl IA, which lacks a C3 methyl group, demonstrating that the presence and correct orientation of the C3 methyl group on the IA compound is required for high-affinity ligand binding and transcriptional activity. Each mutant exhibited a reduced preference for IA-S enantiomer with respect to transactivation, suggesting that this region of the mER functions in ligand stereochemical recognition and activation. A mutation at Met532 diminished DES- and IA-S-induced transactivation by 7.5-fold and 40-fold respectively, with minimal change on their binding affinity. These data suggest that Met532 is required for transactivation induced by the potent agonist, IA-S, and the M532G mutation effectively uncouples IA-S ligand binding from transactivation. Use of these stereochemically different ligands in combination with mutagenesis of the mER demonstrates that ligand structure could influence transactivation by specifically altering the conformation of the mER AF-2 region
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