Nobuhiko Nagai

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A baseline study of soil-transmitted helminthiases was carried out in Nakhon Si Thammarat Province, southern Thailand. The study sites were Wat Krou Chou Primary School and nearby villages in Sichon district, and Wat Thang Phoon Primary School and nearby villages in Chalerm Phrakiat District. Surveys of the schoolchildren's stools were conducted by the(More)
We have proposed a mathematical model for the transmission of Plasmodium vivax malaria quantitatively, which is adjusted to the infected region, Guadalcanal, in the Solomon Islands. The simulation of a transmission model will be instrumental in planning the malaria control strategy. A characteristic of the life cycle of P. vivax is that a sporozoite(More)
This study was conducted in a rural agricultural area in Siniloan, Republic of the Philippines. The subjects were the school children. The nutritional status of 58 children infected with helminthiasis (Ascaris lumbricoides and Trichuris trichiura) was compared with that of 19 uninfected controls. Prevalence of Ascaris and Trichuris was 40.3% and 71.4%(More)
Malaria control by chemotherapy has been established in rural villages of Guadalcanal, the Solomon Islands, following field trials. As a selective primary health care activity, mobile unit teams visited villages once or twice a year to detect malaria positives and gave chloroquine and primaquine to treat the infection and interrupt the transmission. On site(More)
This paper proposes a new algorithm for an emergency control system which prevents transient instability by generator tripping. The algorithm is based on the energy function method, and it precisely can determine the amount of generation to be tripped. A prototype of the proposed system has been made, and it has been confirmed that the algorithm has been(More)
This study was conducted in a rural agricultural area in Siniloan, Republic of the Philippines. The subjects were the school children. The nutritional status of 58 children infected with helminthiasis (Ascaris lumbricoides and Trichuris trichiura) was compared with that of 19 uninfected controls. Prevalence of Ascaris and Trichuris was 40.3% and 71.4%(More)
Compressed SF<inf>6</inf> gas insulation will give a promising way to obtain a reliable, compact, and economical converter station for HVDC transmission. Some of the outcomes of a project in which we have developed a metal enclosed converter station are presented in the paper. Thyristor valves, metal oxide surge arresters, DCCT, PT's, switchgears,(More)
The total dust concentration and the particle size distribution were determined around die sites of demolition associated with the Great Hanshin-Awaji Earthquake, which occurred on January 17, 1995. The total dust concentrations ranged from 0.20 to 0.23 mg/m(3), being about 1.2 to 2.2 times that in die non-demolition area, and intermediate particles(More)
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