Search Results 1-20 of 803

  • Modulation of the Diurnal Cycle of Precipitation near the Southwestern Coast of Sumatra by Mixed Rossby-Gravity Waves

    GENG Biao , KATSUMATA Masaki , TANIGUCHI Kyoko

    … The study focused on a 19-day period from 24 November to 12 December 2015, using data from intensive surface observations, radiosondes, and a C-band polarimetric radar (collected aboard the research vessel Mirai at 4°4′S, 101°54′E), as well as data from a global objective analysis. … Large-scale low-level convergence and upper-level divergence, stronger sea-breeze flow, and colder land-breeze flow were also observed with the intensification of MRGW-induced offshore wind perturbations. …

    Journal of the Meteorological Society of Japan. Ser. II 98(2), 463-480, 2020


  • Design of GNSS PPP-RTK Assistance System and its Algorithms for 5G Mobile Networks

    Asari Koki , Kubo Yukihiro , Sugimoto Sueo

    … In a whirlwind of international cutthroat competition, Global Navigation Satellite System (GNSS) precise positioning is said to be the first application of 5G mobile communication services. … In the comparison to the existing system, this design makes the horizontal accuracy from several centimeters to almost one centimeter, and makes the convergence time from one minute to a few seconds. …

    Transactions of the Institute of Systems, Control and Information Engineers 33(1), 31-37, 2020


  • Climate Statistics in Global Simulations of the Atmosphere, from 80 to 2.5 km Grid Spacing

    Hohenegger Cathy , Kornblueh Luis , Klocke Daniel , Becker Tobias , Cioni Guido , Engels Jan Frederik , Schulzweida Uwe , Stevens Bjorn

    … <p>Basic climate statistics, such as water and energy budgets, location and width of the Intertropical Convergence Zone (ITCZ), trimodal tropical cloud distribution, position of the polar jet, and land sea contrast, remain either biased in coarse-resolution general circulation models or are tuned. …

    Journal of the Meteorological Society of Japan. Ser. II 98(1), 73-91, 2020


  • The Effects of an Upper-Tropospheric Trough on the Heavy Rainfall Event in July 2018 over Japan

    Yokoyama Chie , Tsuji Hiroki , Takayabu Yukari N.

    … The Dual-Frequency Precipitation Radar onboard the core satellite of the Global Precipitation Measurement revealed the significant contribution of rainfall with its top below 10 km, the broad spatial extent covered by stratiform rainfall, and the presence of convective rainfall embedded in the large stratiform rainfall area. …

    Journal of the Meteorological Society of Japan. Ser. II 98(1), 235-255, 2020


  • Cloud Annealing: A Novel Simulated Annealing Algorithm Based on Cloud Model

    JIAO Shanshan , PAN Zhisong , CHEN Yutian , LI Yunbo

    … essentially indicates a heuristic control strategy to combine global random search of the outer loop and local tuning search of the inner loop. … Experimental results in function optimization problems (i.e. single-peak, multi-peak and high dimensional functions) show that, compared with the simple SA algorithm, the proposed cloud annealing algorithm will lead to significant improvement on convergence and the average value of obtained solutions is usually closer to the optimal solution.</p> …

    IEICE Transactions on Information and Systems E103.D(1), 85-92, 2020


  • Accelerating Vegetation Evolution with Mutation Strategy and Gbased Growth Strategy

    YU Jun , TAKAGI Hideyuki

    … We propose two strategies, mutation strategy and Gbased growth strategy, to enhance the performance of standard vegetation evolution (VEGE) that simulates the growth and reproduction of vegetation repeatedly to find the global optimum. … The experimental results confirmed the mutation strategy can increase the diversity and the Gbased growth strategy plays an important role in accelerating convergence. …

    Proceedings IEEE Symposium Series on Computational Intelligence (2019), 3040-3046, 2019-12-06


  • Continuing Global Fertility Convergence

    … This study reexamines fertility convergence by extending Dorius (2008), who explored globalfertility convergence with quinquennial data from 1955–2005. … Using annual data for 187countries in 1960–2017, this study examines global as well as regional fertility convergencefrom three angles: β-convergence, inequality indices, and standard deviation. …

    Working Paper = Working Paper (195), 1-39, 2019-10-01

    IR  DOI 

  • How the Students See the World Affects the Teaching Dynamics : What BEVI Results Can Teach Us  [in Japanese]

    東矢 光代 , 當間 千夏 , Toya Mitsuyo , Toma Chinatsu

    … This paper reports the results of Beliefs, Events and Values Inventory (BEVI) analyses for two groups of students at the University of the Ryukyus: those who began a course in a newly established minor, the Global Shinryo Program, and those who were studying Media English as part of their required coursework. … The results revealed that both groups shared similar patterns: high in Self Awareness (Scale 11), Sociocultural Openness (Scale 15), and Global Resonance (Scale17). …

    言語文化研究紀要 = Scripsimus (28), 23-45, 2019-10


  • Multi-model evaluation of the sensitivity of the global energy budget and hydrological cycle to resolution

    松枝 未遠 , Benoît Vannière , Marie-Estelle Demory , Pier Luigi Vidale , Reinhard Schiemann , Malcolm J. Roberts , Christopher D. Roberts , Mio MATSUEDA , Laurent Terray , Torben Koenigk , Retish Senan

    … This study undertakes a multi-model comparison with the aim to describe and quantify systematic changes of the global energy and water budgets when the horizontal resolution of atmospheric models is increased and to identify common factors of these changes among models. … The main changes in the global energy budget with resolution are a systematic increase in outgoing longwave radiation and decrease in outgoing shortwave radiation due to changes in cloud properties, and a systematic increase in surface latent heat flux; …

    Climate dynamics 52(11), 6817-6846, 2019-06


  • Blockchain-based Node-aware Dynamic Weighting Methods for Improving Federated Learning Performance

    You Jun Kim , Choong Seon Hong

    IEICE Proceeding Series (56), P3-1, 2019


  • Object Design for Hybrid Cellular Automata Morphogenetic System of Emergence Concept  [in Japanese]

    MIYATA Satoshi

    … It has, however, very limited propagation speed of information and the limitation spoils global consistency; … poor convergence of filed, stuck at a false state and so on. …

    The Proceedings of Design & Systems Conference 2019.29(0), 3401, 2019


  • Adaptive Stepsize Rule for Consensus Optimization by Supervisory Control Architecture

    Kusunoki Yoshifumi , Hayashi Naoki , Hatanaka Takeshi , Tatsumi Keiji

    … It can archive both of fast approach and convergence at the early and last stages of iteration, respectively. … Since the stepsize of each iteration is computed using a part of the global information of agents, a supervisory control architecture is required. …

    Transactions of the Institute of Systems, Control and Information Engineers 32(9), 338-348, 2019


  • Decentralized Local Scaling Factor Control for Backoff-Based Opportunistic Routing

    YAMAZAKI Taku , YAMAMOTO Ryo , HOSOKAWA Genki , KUNITACHI Tadahide , TANAKA Yoshiaki

    … In the protocols, each potential forwarder calculates the backoff time based on the product of a weight and global scaling factor. … The global scaling factor is a predetermined value to map the weight to the actual backoff time. … However, there are three common issues derived from the global scaling factor. … First, it is necessary to share the predetermined global scaling factor with a centralized manner among all terminals properly for the backoff time calculation. …

    IEICE Transactions on Information and Systems E102.D(12), 2317-2328, 2019


  • Distributed Dynamic Reference Governor for Constrained Semi-Autonomous Robotic Swarms with Communication Delays and Experimental Verification

    FARRAS Aditya Wildan , HATANAKA Takeshi , NGUYEN Tam W. , FUNADA Riku , YAMAUCHI Junya , FUJITA Masayuki

    … Due to the limited access of global information, we present a passivity-based distributed reference governor scheme. … Based on passivity theory, we prove the convergence of the estimated states of the reference governor to the optimal solution. …

    SICE Journal of Control, Measurement, and System Integration 12(6), 237-245, 2019


  • Opposition-based learning for self-adaptive control parameters in differential evolution for optimal mechanism design

    BUI Tam , NGUYEN Trung , HASEGAWA Hiroshi

    … Simulation results show the effectiveness and improvement compared with some reference methodologies in terms of the convergence speed and stability of optimal results.</p> …

    Journal of Advanced Mechanical Design, Systems, and Manufacturing 13(4), JAMDSM0072-JAMDSM0072, 2019


  • A Hybrid CRBP-VMP Cooperative Positioning Algorithm for Distributed Multi-UAVs

    LU Lu , LI Guangxia , LIU Tianwei , LI Siming , TIAN Shiwei

    … Traditionally, the positioning information is widely provided by Global Navigation Satellite System (GNSS) due to its good performance and global coverage. … Simulation results demonstrate that the higher positioning accuracy, the better convergence as well as low computational complexity and communication cost of the proposed CRBP-VMP algorithm, which can be achieved compared with sum-product algorithm over a wireless network (SPAWN) and traditional Cubature Kalman Filters (CKF) method.</p> …

    IEICE Transactions on Communications E102.B(10), 1933-1940, 2019


  • Hybridizing Dragonfly Algorithm with Differential Evolution for Global Optimization

    DUAN MeiJun , YANG HongYu , YANG Bo , WU XiPing , LIANG HaiJun

    … <p>Due to its simplicity and efficiency, differential evolution (DE) has gained the interest of researchers from various fields for solving global optimization problems. … However, it is prone to premature convergence at local minima. … To overcome this drawback, a novel hybrid dragonfly algorithm with differential evolution (Hybrid DA-DE) for solving global optimization problems is proposed. …

    IEICE Transactions on Information and Systems E102.D(10), 1891-1901, 2019


  • MR-AntMiner: A Novel MapReduce Classification Rule Discovery with Ant Colony Intelligence

    Kong Yun , Zhao Junsan , Dong Na , Lin Yilin , Yuan Lei , Chen Guoping

    … However, on the one hand, the ACO algorithm has defects including long search times and convergence issues with non-optimal solutions. … then the traditional ACO algorithm is run on each mapper to gain the local best rule set, and the global best rule list is produced in the reducer phase according to a voting mechanism. …

    Journal of Advanced Computational Intelligence and Intelligent Informatics 23(5), 928-938, 2019


  • A Transhipment Hub in South Asia and its Competition: Application of Network Equilibrium Assignment Model for Global Maritime Container Shipping

    SHIBASAKI Ryuichi , KAWASAKI Tomoya

    … <p>This paper focuses on a container transhipment hub in South Asia (namely, Colombo port, Sri Lanka) and its competitive situation, by applying a model to predict global container movements on the international maritime shipping network, based on a network equilibrium assignment methodology, under the given shipping demand between seaports. …

    Asian Transport Studies 5(4), 546-569, 2019


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