Optimum Traffic Distribution Algorithm for Satellite System Taking Account of Satellite Power Limit

Nanba, Shinobu,Konishi, Satoshi,Nomoto, Shinichi 통신위성우주산업연구회 2000 Joint Conference on Satellite Communications Vol.2000 No.-

In satellite communications systems, satellite transmitting power (in short, 'satellite power') is one of the critical radio resources for satellite systems, as well as spectrum resources, due to the limited ability of onboard electric generator. Therefore, for attaining optimum satellite radio resource utilization, it is not enough to just consider the spectrum resources but also to take account of the satellite power. In multiple satellites systems, the coverage of a satellite has overlapping areas with those of adjacent satellites. In this case, the traffic demand in overlapping area can be accommodated by either of visible satellites. For these systems, this paper proposes an algorithm to provide an optimum traffic distribution among satellites. The algorithm adopts linear programming model considering satellite power limits. Numerical examples demonstrate that the proposed algorithms contribute to maximizing the system capacity.

A Proposal of a Radio Channel Allocation Scheme in Wide-Area Wireless Access Systems Taking Account of Fairness Services

Nanba, Shinobu,Konishi, Satoshi,Nomoto, Shinichi 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-

In wide-area wireless access systems with a large number of cells such as satellite systems and HAPS (High Altitude Platform Systems), a Radio channel allocation scheme based on a pre-plan, where a number of channels are allocated to each cell beforehand, is considered to be effective to reuse the radio resources. In such a channel allocation, it is a problem that the number of channels to be allocated to cells can not be determined appropriately in case of multiple services with different QoS parameters. In this paper, a radio channel allocation scheme based on a pre-plan for multiple services is proposed. The scheme attempts to allocate channels to each cell for all services while keeping fairness among services by introducing a degree of satisfaction as a common measure between services. The degree of satisfaction for each service can be defined by a satisfaction function, which is given for every service. In addition, we device an algorithm to realize the scheme. Moreover, other two algorithms are introduces to achieve fairness among services, where available resources are exclusively partitioned among services by a traffic ratio among services or keeping DoS among services constant and then a number of channels are allocated to each cell according to the traffic demands ratio between cells. In our simulation, these algorithms are compared and evaluated.

On the Satellite Resource Allocation Algorithm Taking Account of Fairness among Spotbeams

Nanba, Shinobu,Kishi, Yoji,Konishi, Satoshi 통신위성우주산업연구회 2001 Joint Conference on Satellite Communications Vol.2001 No.-

In satellite communications systems with multiple-spotbeams, conventional algorithms for satellite resource allocation is suitable for the guaranteed services, which allocate satellite resources to spotbeams to meet the number of required frequency channels as much as possible. In recent years, many kinds of best-effort services are widely spreading in accordance with the explosive growth of the Internet. For the best-effort services, it would be quite significant to keep resource allocation fairness among spotbearns and/or different services. Then, we propose a new satellite resource allocation algorithm that takes account of the fairness among spotbeams. As a measure of fairness, this paper introduces the concept of a degree of satisfaction for each spotbeam. Our algorithm is compared with the conventional algorithm for guaranteed services through simulations and characteristics for both algorithms are discussed.

Association of the number of remaining teeth with kidney function in community-dwelling healthy older adults: a cross-sectional study

Yui Nanba,Yuhei Matsuda,Satsuki Watanabe,Mayu Takeda,Takafumi Abe,Kazumichi Tominaga,Minoru Isomura,Takahiro Kanno 대한구강악안면외과학회 2023 대한구강악안면외과학회지 Vol.49 No.5

Objectives: Although a few studies have investigated the relationship between kidney and oral function (number of remaining teeth), their results remain inconclusive. Therefore, this study aimed to investigate the relationship between kidney function and oral health in community-dwelling healthy elderlies and examine the factors associated with kidney function. Materials and Methods: We used cross-sectional data from the Shimane prefecture cohort recruited by the Center for Community-Based Health Research and Education in 2019. We collected clinical data on dental status, background factors and kidney function (estimated glomerular filtration rate [eGFR], mL/min/1.73 m2 and creatinine levels, mg/dL). Results: The study enrolled 481 participants, whose mean age was 66.7±7.4 years, and 223 (46.4%) participants were men. Multivariate analysis revealed significant correlations between eGFR (B=0.17, P=0.04), creatinine (B=–0.54, P<0.01), and the number of remaining teeth. The number of remaining teeth was associated with creatinine and eGFR, which are indicators of kidney function. Conclusion: This study suggests that preserving the teeth may prevent decline in kidney function. Dental professionals should provide instructions and professional care to reduce the risk of systemic diseases such as kidney dysfunction.

A Proposal of Radio Channel Allocation Algorithms Taking Account of Both Frequency and Power Constraints for Wide-Area Wireless Access Systems

Konishi, Satoshi,Kishi, Yoji,Nanba, Shinobu,Nomoto, Shinichi 통신위성우주산업연구회 2001 Joint Conference on Satellite Communications Vol.2001 No.-

In wide-area wireless access systems such as satellite communications systems and stratospheric platform systems, electric power supply for radio communications is realized by using solar photovoltaic cells and/or fuel cells. Hence, not only frequency band but also electric power is a limited and crucial radio resources for those systems. Although radio channel allocation algorithms taking account of the frequency constraint only or the power constraint only have been proposed, radio channel allocation algorithms taking account of the both constraints simultaneously have not been studied enough so far. This paper proposes a radio channel allocation algorithm utilizing the linear programming method to address this issue. The proposed algorithm firstly allocates radio channels in proportion to the traffic demand distributed over the area and then maximizes the total radio channels allocated to systems. Some numerical results are given for a stratospheric platform system that covers a part of Japanese land, for example, in order to demonstrate the effectiveness of this algorithm.

New micropalaeontological evidence for a Late Triassic Shan-Thai orogeny

Keisuke Ishida,Ariko Nanba,Francis Hirsch,Takeshi Kozai,Assanee Meesook 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3

The Shan-Thai block is viewed as a remnant of Pale-otethys in South East Asia. The general consensus about its originis that it happened through the rifting from Gondwanaland andfinal amalgamation to Eurasia, sealed by fluvialshallow marineJurassic deposits. As the main Paleotethyan closure, the NanUttara-dit/NanChantaburi and BentongRaub sutures were proposedby other workers. However, a suture further west, flanked by theGondwanaTethys divide (GTD), is advocated here as the mainPaleotethyan closure. The Midle and Late Triassic radiolarianfaunas were extracted from a chert-sequence in the Mae-Sot andUmphang areas of NW Thailand. The radiolarian faunas indicateearly Ladinian, earlymiddle Norian, and NorianRhaetian, indi-vidually. The Triassic chert-sequence is overlain by the ‘Jurassicbase-conglomerate’. The limestone and chert clasts in the conglom-erate yield EarlyLate Triassic conodonts and MiddleLate Tri-assic radiolarians, respectively. Chert clasts in the conglomerateyield among others NorianRhaetian radiolarians that are correl-Late Triassic conodonts arefound in limestone clasts. The silici-pelagic origin of the clasts sug-gests the presence of an ocean before the end-Triassic orogenyalong the Mae Sariang Zone that amalgamated the parts of theShan-Thai block. This first finding of Late Triassic radiolariansfrom chert-sequence, next to the Middle Triassic and older radi-olarian faunas, adds another element to the reconstruction of thesequence now comprised in the Mae Sariang Zone, west of theNanUttaradit Suture. The occurrence of Triassic limestone, as thatof the Chaiburi Formation in the Mae Sariang Zone, or the Kodi-ang Limestone in the “Western Zone”, may elucidate the questionclasts in the Jurassic base-conglomerate that seals the MaeSari-ang Zone. The newly dated Triassic sequence is further sealed bythe continental-shelf deposits of the Toarcian-early Bajocian HuaFai Group.

Chemical Bonding State of Sulfur in Oxysulfide Glasses

Asahi, Taro,Miura, Yoshinari,Nanba, Tokuro,Yamashita, Hiroshi The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.2

Simple binary $Na_2S-SiO_2$ oxysulfide glasses were prepared by a conventional melt-quench method in order to investigate the role of sulfur in glass structure and the electronic state. By X-ray photoelectron spectroscopy(XPS) measurement, S2p binding energy of the glass was observed at approximately 161eV which was close to that of ionic $S^{2-}$. The coordinating state around silicon atoms were investigated by ${29}^Si$ MAS-NMR measurement. The chemical shift observed from NMR supported that sulfur atom was joined to a silicon atom by substituting for an oxygen atom and was present as a non-bridging sulfide ion in low alkali content. On the other hand, it could be presumed that a portion of sulfur anions existed in an isolated state from the glass-network frame at high alkali content. The state of these sulfurs was also studied by Raman spectroscopy in detail.

Dynamic Response of a Cavitating Centrifugal Pump to Fluctuating Rotational Speed

H. Tsukamoto,J. Asakura,N. Tominaga,H. Nanba,T. Tanaka 대한기계학회 1997 International Conference on Fluid Machinery Vol.1 No.1

The Efficacy of Early Start Denver Model Intervention in Young Children with Autism Spectrum Disorder Within Japan: A Preliminary Study

Yukie Tateno,Kahoru Kumagai,Ryunosuke Monden,Kotaro Nanba,Ayumi Yano,Eri Shiraishi,Alan R. Teo,Masaru Tateno 대한소아청소년정신의학회 2021 소아청소년정신의학 Vol.32 No.1

Objectives: Among the many intervention programs for children with autism spectrum disorder (ASD), the Early Start Denver Model (ESDM) is one of the few approaches that has succeeded in demonstrating clinical efficacy in randomized control trials. Here, we investigate the clinical efficacy of ESDM intervention in young children with ASD in a community setting within Japan. Methods: All subjects were children with ASD who received ESDM intervention during the study period. Each ESDM session lasted 75 min and occurred once per week for at least 12 weeks. The outcome measures consisted of the Kyoto Scale of Psychological Development (K-test), Aberrant Behavior Checklist-Japanese version (ABC-J), and the Clinical Global Impression-Severity scale (CGI-S). Results: Twenty-seven subjects (29.4±6.4 months old) received ESDM intervention that lasted for 8.0±2.6 months on average. The score on Language and Social developmental quotient on the K-test increased significantly after the intervention. The total scores on the ABC-J and CGI-S significantly decreased after completion of the ESDM intervention. Conclusion: Our results suggest that ESDM intervention could reduce the severity of distinct clinical features of ASD, such as impairments in social interaction and communication assessed by the K-test, and maladaptive behavior rated by the ABC-J and CGI-S. We believe that the ESDM adapted to each institution might become one of the standard options for children with ASD in Japan.

Studies on the characterization of sulfur and coloration in borosilicate glasses

Taro Asahi,Susumu Nakayama,Tokuro Nanba,Hajime Kiyono,Hiroshi Yamashita,Takashi Maekawa 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.4

Ternary alkali borosilicate glasses containing sulfur were prepared by a conventional melt quenching method, and their chemical bonding states were investigated based on XPS and 29Si,11B MAS-NMR measurement. The glass samples changed in color from blue to reddish brown due to the state of the sulfur and their glass compositions. From S2p photoelectron spectra, it can be seen that the sulfur exists with a negative charge in the glass. The forming of non-bridging oxygen components was observed from O1s photoelectron spectra of the glasses, which colored to brown and reddish brown. Furthermore, a signal from silicon atoms coordinated to the sulfur was detected in these glasses by the 29Si MAS-NMR measurement. From these results, it is considered that sulfur atoms bonded silicon atoms at the forming range of the non-bridging oxygen component. Ternary alkali borosilicate glasses containing sulfur were prepared by a conventional melt quenching method, and their chemical bonding states were investigated based on XPS and 29Si,11B MAS-NMR measurement. The glass samples changed in color from blue to reddish brown due to the state of the sulfur and their glass compositions. From S2p photoelectron spectra, it can be seen that the sulfur exists with a negative charge in the glass. The forming of non-bridging oxygen components was observed from O1s photoelectron spectra of the glasses, which colored to brown and reddish brown. Furthermore, a signal from silicon atoms coordinated to the sulfur was detected in these glasses by the 29Si MAS-NMR measurement. From these results, it is considered that sulfur atoms bonded silicon atoms at the forming range of the non-bridging oxygen component.