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Eunsun Keum,Chuleui Jung,Gen Takaku,Kangwon Lee 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Phoretic mites were collected from Copris ochus and C. tripartitus (Coleoptera: Scarabaeidae). These beetles were collected from Holoce Ecosystem Conservation Research Institution, Gangwon-do. Five unrecorded species of Eviphis hastatellus Berlese, 1910 (Eviphididae), Holostaspella scatophila Takaku, 1994 (Macrochelidae), Macrocheles japonicus Evans & Hyatt, 1963 (Macrochelidae), Pachylaelaps siculus Berlese, 1921 (Pachylaelapidae) and Parasitus consanguineus Oudemans & Voigts, 1904 (Parasitidae) were recorded from Korea for the first time. However, Parasitus consanguineus Oudemans & Voigts (Parasitidae) was already recorded by Oudemans & Voigts in 1904 but since then no one has recorded. We have rerecorded this species in Korea.
Soil gamasid mites: their diversity and availability as bioindicators
Gen Takaku,Minako Takagi,Ayaka Fukuda,Mitsuo Sogabe 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Gamasida (Acari, Parasitiformes) is one the most diverse group in mites, and they inhabit in various environments, for example soil, tree canopy, tree trunk, leaves, animal, inter-tidal zone. About 10,000 species have been described in the world, half of them are predatory mites in soil and litter, and they prey on nematodes, small insects and mites. Although many predatory gamasid mites have been recorded from soil and litter in Japan, difference of diversity and difference of species composition of gamasid mites in different soil environments have not surveyed and discussed yet. In the present study, we surveyed soil gamasid mites in urban environment in Sapporo City, Hokkaido, Japan, and compared with gamasid mites in secondary forests (mixed forest, deciduous broad-leaved forest) in and near Sapporo. Our study focused on the following points: 1) difference of diversity in each environment; 2) characteristic taxa in each envrironment; and 3) availability of some taxa as bioindicator to evaluate environment. Number of species and index of diversity were higher in the fauna of secondary forests. Diversity of the families Parasitidae and Laelapidae were higher in urban environment fauna, while diversity of Parholaspidae and Veigaiidae were higher in the forest one. In the forest, mites of the family Zerconidae appeared exclusively, whereas one species of the family Parholaspidae and Parasitidae were dominant in urban mite fauna. Family Zerconidae and some species of Parholaspidae and Parasitidae may be available as bioindicator to evaluate soil environment.
Development of 1700V Hybrid Module with Si-IGBT and SiC-SBD for High Efficiency
T. Takaku,H. Wang,N. Matsuda,S. Igarashi,T. Nishimura,S. Miyashita,O. Ikawa 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper describes about newly developed 1700V/400A hybrid module which consists of Si-IGBT and SiC-SBD. The static and dynamic characteristics were evaluated and the turn-on loss is 38% lower and the reverse recovery loss is 83% lower than the conventional all-Si IGBT module because of the reverse recovery current of SiC-SBD is very small to be an unipolar device. The radiation noise on hybrid module becomes higher with increasing collector current, but the peak value of the noise from hybrid module is almost same as the all-Si module if the collector current is less than 300A. In AC690V PWM inverter, the total power dissipation of hybrid module is 8% lower at 1 kHz and 29% lower at 10 kHz compare to the all Si module. Therefore the 1700V hybrid module is useful as a power module for an AC690V high efficiency inverter system such as wind power generation system and high voltage solar power generation system. This paper reports about the static and dynamic characteristics and the radiation noise measurement results on the 400A/1700V hybrid module.
Reo TAKAKU,Shun-ichiro BESSHO 한국재정학회 2015 한국재정학회 학술대회 논문집 Vol.2015 No.3
The Japan Medical Association, a lobby of physicians, went on strike in July 1971 because of the medical reforms by the government. Although these physicians resigned as health insurance doctors, they continued to provide medical care and even health insurance treatment in some areas. This study uses the regional differences in resignation rates as a natural experiment to examine how the payment method of health insurance affects medical service utilization and health outcomes. Our estimation results indicate that if the participation rate of the strike increased by 1 percentage point and proxy claims were refused completely, the number of cases of insurance benefits and total amount of insurance benefits would decrease by 0.78% and 0.58%, respectively compared with the same month in the previous year. Moreover, the average amount of insurance benefits per claim increased since patients with relatively less serious diseases might have sought healthcare less often. Finally, our results suggest that the strike did not affect death rates in Japan.
Keum, E.,Takaku, G.,Lee, K.,Jung, C. Korean Society of Applied Entomology 2016 Journal of Asia-Pacific Entomology Vol.19 No.2
<P>Phoresy is one of the dispersal mechanisms of wingless microarthropods such as mites attached on the winged host. Mites associated with two scarabaeid beetles, Copris ochus and C. tripartitus (Coleoptera: Scarabaeidae) were collected from the ex-situ conservation site in Heongseong, Gangwon province in Korea. Among them, four species Copriphis hastatellus Berlese, 1910 (Eviphididae); Holostaspella scatophila Takaku, 1994 (Macrochelidae); Macrocheles japonicus Evans and Hyatt, 1963 (Macrochelidae); and Onchodellus siculus Berlese, 1892 (Pachylaelapidae) were recorded for the first time in Korea. Also, Parasitus consanguineus Oudemans and Voigts (Parasitidae) was previously recorded from the specimen in northern part of Korea in 1904, but since then no record has been made for a century. This is the second observation of this species over 100 years in the Korean peninsula. Description of this species is presented for comparison with the original description. Further discussion explored the relationship between the mites and dung beetles, and possible implication for the conservation of the endangered species. (C) 2016 Korean Society of Applied Entomology, Taiwan Entomological Society and Malaysian Plant Protection Society. Published by Elsevier B.V. All rights reserved.</P>
Risk Factors for Complications after Reconstructive Surgery for Sternal Wound Infection
Hashimoto, Ichiro,Takaku, Mitsuru,Matsuo, Shinji,Abe, Yoshiro,Harada, Hiroshi,Nagae, Hiroaki,Fujioka, Yusuke,Anraku, Kuniaki,Inagawa, Kiichi,Nakanishi, Hideki Korean Society of Plastic and Reconstructive Surge 2014 Archives of Plastic Surgery Vol.41 No.3
Background Although the utility of flaps for the treatment of sternal wound infections following median sternotomy has been reported for 30 years, there have been few reports on the risk factors for complications after reconstruction. The objective of this investigation was to identify factors related to complications after the reconstruction of sternal wound infections. Methods A retrospective analysis of 74 patients with reconstructive surgery after sternal wound infection over a 5-year period was performed. Clinical data including age, sex, body mass index (BMI), comorbidities, bacterial culture, previous cardiac surgery, wound depth, mortality rate, type of reconstructive procedure, and complication rate were collected. Results The patients' BMI ranged from 15.2 to $33.6kg/m^2$ (mean, $23.1{\pm}3.74kg/m^2$). Wound closure complications after reconstructive surgery were observed in 36.5% of the cases. The mortality rate was 2.7%. Diabetes mellitus significantly affected the rate of wound closure complications (P=0.041). A significant difference in the number of complications was seen between Staphylococcus aureus (S. aureus) and coagulase-negative Staphylococci (P=0.011). There was a correlation between harvesting of the internal thoracic artery and postoperative complications (P=0.048). The complication rates of the pectoralis major flap, rectus abdominis flap, omentum flap, a combination of pectoralis major flap and rectus abdominis flap, and direct closure were 23.3%, 33.3%, 100%, 37.5%, and 35.7%, respectively. Conclusions Diabetes mellitus, S. aureus, harvesting of the internal thoracic artery, and omentum flap were significant factors for complications after reconstruction. The omentum flap volume may be related to the complications associated with the omentum flap transfer in the present study.