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Improvement of a Low Cost MEMS-based GPS/INS, Micro-GAIA
Takeshi Fujiwara,Toshiaki Tsujii,Hiroshi Tomita,Masatoshi Harigae 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-
Recently, inertial sensors like gyros and accelerometers have been quite miniaturized by Micro Electro-Mechanical Systems (MEMS) technology. JAXA is developing a MEMS-based GPS/INS hybrid navigation system named Micro-GAIA. The navigation performance of Micro-GAIA was evaluated through off-line analysis by using flight test data. The estimation errors of the roll, pitch, and azimuth were 0.03°, 0.05°, and 0.33° (1ο), respectively. The horizontal position errors after 60-second GPS outages were reduced to 25m CEP. The attitude errors and position errors are nearly half of ones reported previously[2]. Furthermore, using the adaptive Kalman filters, the robustness against the uncertainty of the measurement noise was improved. Comparing the innovation-based and residual-based adaptive Kalman filters, it was confirmed that the latter is robuster than the former.
Takeshi Kokubo,Shimpei Wakai,Daisuke Fujiwara,Osamu Kanauchi,Kenta Jounai,Hisahiro Ichikawa,Mihoko Takuma,Yoshihisa Kanaya,Ryohei Shiraoka 한국식품영양과학회 2020 Preventive Nutrition and Food Science Vol.25 No.2
Maintaining employees’ presenteeism is a major issue in the workplace. Simple and convenient methods to improve presenteeism are required. We investigated whether administering the lactic acid bacteria Lactococcus lactis strain Plasma (LC-Plasma) can improve the performance and physical condition of office workers. Subjects were randomly assigned to one of two groups: 1) an intake period (consumption of LC-Plasma-containing yogurt beverage) followed by a non-intake period, or 2) a non-intake period followed by an intake period. Each period lasted 4 weeks and there was a 4-week washout period between each. Assessment was conducted using the World Health Organization Health and Work Performance Questionnaire (HPQ), the Profile of Mood States (POMS) questionnaire and physical condition questionnaires. A total of 153 subjects were analyzed. Absolute presenteeism (as assessed by the HPQ) and vigor (as assessed by POMS) were significantly higher in the intake period than the non-intake period. The subject’s physical health (as assessed by typical common cold symptoms, physical condition, sneezing or runny noses, coughing or sore throats, and lassitude) was also superior during the LC-Plasma intake period. Our results suggest that intake of LC-Plasma for 4 weeks improves work performance through reducing the risk of infection.
Development of INS-aided GPS Tracking Loop and Preliminary Flight Test
Toshiaki Tsujii,Takeshi Fujiwara,Yoshimitsu Suganuma,Hiroshi Tomita,Ivan Petrovski 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Robust tracking of GNSS signal in a harsh environment such as a severe ionospheric scintillation is achallenge for civil aviation. The use of inertial sensor would improve the tracking performance since the Doppler frequency caused by aircraft dynamics could be compensated by the inertial measurements. In order to evaluate such an aiding, an INS aided GPS tracking loop was developed by using a software receiver, and a preliminary flight test was conducted. Off-line analyses showed a reduced carrier phase error and a possible reduction of noise band width in tracking loop, which would result in positioning accuracy improvement.
Tsujii, Toshiaki,Fujiwara, Takeshi,Kubota, Tetsunari,Satirapod, Chalermchon,Supnithi, Pornchai,Tsugawa, Takuya,Lee, Hungkyu Korean Society of Surveying 2012 한국측량학회지 Vol.30 No.6
Ionospheric anomaly is one of the major error sources which deteriorate the GNSS performance. In the equatorial region, effects of the ionospheric plasma bubbles are of great interest because they are pretty common phenomena, especially in the period of the high solar activity. In order to evaluate the GNSS performance under circumstance of the bubbles, an ionospheric scintillation monitor has been developed and installed in Bangkok, Thailand. Furthermore, a model simulating the ionospheric delay and scintillation due to the bubbles has been developed. Based on these developments, the effects of the simulated plasma bubbles are analyzed and their agreement with the real observation is demonstrated. An availability degradation of the GPS ground based augmentation system (GBAS) caused by the bubbles is exampled in details. Finally, an integrated GPS/INS approach based on the Doppler frequency is proposed to remedy the deterioration.
Oyama, Kenji,Fujiwara, Shinya,Katsuta, Tomohiro,Honda, Takeshi,Mukai, Fumio Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.2
Reproductive abilities in beef cattle herds are receiving increased attention due to recent rises in production costs. To achieve more efficient management, a measure of fertility, namely the number of calves produced at k yr of age ($NCP_k$), was developed and its genetic parameters were estimated from Japanese Black cows by restricted maximum likelihood procedures. The k examined were distributed from 2 to 10 yr of age and $NCP_2$ averaged 1.077 calves over 43,536 cows. The averages increased by approximately 0.9 calf with each additional 1 yr increment in k. Heritabilities of $NCP_k$ were estimated to be low ranging from 0.083 to 0.162, which seemingly suggested a difficulty of genetic improvement. However, large genetic variation and high accuracy were observed in predicted breeding values of $NCP_k$. For example, the breeding values of $NCP_7$ were predicted between -0.303 and +0.213 with average accuracy of 0.607 for cows with observations. Genetic correlations among different k were generally high and positive (0.474 to 0.995). The analyses showed that at least $NCP_4$ was required to maintain the genetic correlations of 0.8 or higher with subsequent $NCP_k$. Also $NCP_5$ maintained the genetic correlations of 0.9 or higher with subsequent $NCP_k$ The results suggested some possibilities for $NCP_k$ to be a selection criterion considering its genetic variation, high accuracy and consistency with subsequent performance.
Municipal Solid Waste Characterization and Recycling Potentials in Phnom Penh City, Cambodia
( Bandith Seng ),( Takeshi Fujiwara ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Municipal solid waste (MSW) generation in Phnom Pen city is increasing as main result of population growth and economic development. Yet, waste collection service is not available throughout the city. Only some districts in the central could have accessed to the service 80-100%. Current management approach is only just about collection and disposal into the landfill; there is no such pre-treatment nor treatment facility. Waste disposal to Dangkor landfill, the in-operation dumpsite for final MSW disposal, is also relatively increased. As of July 2014, it is 53,535tons/month, or in average 1,727tons/day with annual increasing rate 9.37%. Organic (55.42%), plastic (20.75%) and textile (12.06%) are respectively shares the large portions in waste composition. Characteristically, Phnom Penh MSW is potential for compositing (54.93%) and recycling (22.29%). In recycling activities, informal sector is playing important role and in the landfill, there are 300 scavengers scavenging the valuable materials. The recycling could happen through material marketing. It could recover about 607tons/month from landfilling, or about 1.13% of total disposed waste in July 2014. Therefore, it shows that 21.16% of marketable materials have lost the values by being unrecoverable. Economically, regarding current markets the loss value could be 822 million Riel/month. The management system needs upgrading to sound more sustainable. Integrated solid waste management (ISWM) especially recycling should be introduced. Waste pre-treatment at sources is an advance. It would not only reduce the final disposal to landfill, but also generate economic benefits. However, sudden changes of the current system might result a failure whilst equipment, facility, expertise and financial resources are so challenging. Starting scale should be manageable and achievable. Preliminarily, recycling may demonstrate and the pilots should take place in such academic institutes, public and private premises prior to widening to another treatment alternatives and generation sources.
Dinh Pham Van,Takeshi Fujiwara,Bach Leu Tho,Pham Phu Song Toan,Giang Hoang Minh 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.1
With benefits to the human health, environment, economy, and energy, anaerobic digestion (AD) systems have attracted remarkable attention within the scientific community. Anaerobic digestion system is created from (bio)reactors to perform a series of bi-metabolism steps including hydrolysis/acidogenesis, acetogenesis, and methanogenesis. By considering the physical separation of the digestion steps above, AD systems can be classified into single-stage (all digestion steps in one reactor) and multi-stage (digestion steps in various reactors). Operation of the AD systems does not only depend on the type of digestion system but also relies on the interaction among growth factors (temperature, pH, and nutrients), the type of reactor, and operating parameters (retention time, organic loading rate). However, these interactions were often reviewed inadequately for the single-stage digestion systems. Therefore, this paper aims to provide a comprehensive review of both single-stage and multi-stage systems as well as the influence of the growth factors, operating conditions, and the type of reactor on them. From those points, the advantages, disadvantages, and application range of each system are well understood.