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Tomoharu Inoue,Shin Nagai,Shota Inoue,Masahiro Ozaki,Shohei Sakai,Hiroyuki Muraoka,Hiroshi Koizumi 한국산림과학회 2012 Forest Science And Technology Vol.8 No.2
We investigated the relationships between soil respiration and environmental factors during foliation and defoliation periods in three ecosystems under the same physical–geographical environmental conditions in central Japan. These ecosystems comprised deciduous broad-leaved forest (Quercus crispula dominated, site Q), deciduous needle-leaved forest (Larix kaempferi dominated, site L), and grassland (Zoysia japonica dominated, site Z). Field measurements of soil respiration were made using a closed chamber method with an infrared gas analyzer at monthly intervals in the snow-free seasons from May 2010 to November 2011. Soil respiration began to increase in May, peaked rapidly in summer (July to September), and decreased in November. The seasonal patterns of soil respiration and soil temperature were nearly parallel among the three sites, with one exception, which may have been caused by the decrease in soil water content during summer months (July to September). Although Q_10 values based on the entire measurement period in 2010 were roughly the same as those in 2011 at the three sites, there was a large difference in Q_10 between the foliation and defoliation periods in both years, especially at the two forest sites. These differences among the three sites may be caused by differences in soil temperature dynamics and precipitation activity. To better understand the relationship between soil respiration and environmental factors, continuous observations are needed of soil respiration, environmental factors, and biological activities both below ground and above ground under the same physical–geographical environmental conditions.
Hierarchical Control of Power Networks by using Overlapping Information
Tomoharu Suehiro,Toru Namerikawa 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This study deals with decentralized and hierarchical control for electric power networks by using overlapping information. The control objective is to minimize the cost function of the load frequency control problem. The control law consists of three steps. We apply the decentralized hierarchical control methodology to large-scale electrical power networks consisting of distributed power storage and generation sources such as batteries and wind power generators. Through several numerical simulation results of decentralized power networks, we verified their stability, compared the proposed and the previous decentralized methods, and showed the effectiveness of the proposed method.
A Study of Container Harbor Policy in Japan
Tomoharu Ozawa(토모하루 오자와),Sung-Jae Pak(박성재) 한국해양비즈니스학회 2006 해양비즈니스 Vol.- No.7
As for the international maritime container transportation, there are three specific problems as follows :<BR> It is i) Globalization of Shippers, ii) Changes of Maritime Transportation, iii) Delay in Upgrading Harbor Systems.<BR> But Japan has improved and consolidated the terminal facility services and introduced new methods from time to time.<BR> Those are:<BR> ① organizing Terminal Authority of International Trading (Futo Kodan)<BR> ② commissioning Terminal Corporations (Futo Kosha) to operate the terminals<BR> ③ new methods of constructing/operating container terminals<BR> ④ privatizing container terminals<BR> In most cases, terminal operation should shift the priority from public service to stable management. At the same time, harbor management should consider the local economic character and establish an individual strategic policy. It is best to work together with neighboring ports for efficient operation and consider role sharing of each port in wide-range tactics
Estimation of Solid Friction in Mechanical Systems
Tomoharu Shimizu,Tadashi Ishihara,Hikaru Inooka 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
This paper describes the estimation of the solid friction in mechanical systems by using the extended Kalman filtering techniques. We proposed two stochastic model for the estimation. The one is the 'parametric model' which represents the friction characteristics by an exponential function with unknown parameters. The other is the 'blind model' which does not assume an explicit model but regard the effect of the friction as an unknown input to a known dynamic system. For both models, we give estimation algorithms to generate the filtered estimate and the smoothed estimate with a fixed lag. The filtered estimate can be generated on-line for compensating the solid friction in mechanical systems. Although on-line applications are impossible, the smoothed estimate is more accurate and can be used to grasp precise friction characteristics. Simulation and experimental results are presented to show the effectiveness of the proposed techniques.
FRETTING WEAR PROPERTY OF ZR-ALLOY IN Na₂SO₄ SOLUTION
SHIMIZU, Tomoharu,NAKAMURA, Tomohiro,IWABUCHI, Akira,SUGAWARA, Yusaaku,KIM, Seck Sam ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 2000 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.2000 No.-
Fuel rods in nuclear power plants, made of Zr-alloy(zircaloy-4), is immersed in pure water, and surging of this coolant causes fretting for the rods and spacer. In this paper fretting wear of Zr-alloy is investigated in corrosive environment. As the corrosion behavior in fretting is important, Na₂SO₄ solution was used, and electrochemical approach was taken. The wear increases with the potential, which means the electrochemical factor is significant in the fretting of Zr-alloy in corrosive environment. The dynamic corrosion kinetics in the fretting was discussed.
Monitoring of tool wear for high precision blanking using AE technique
SHIMIZU, Tomoharu,NISHI, Junichiro,IWABUCHI, Akira ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1999 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1999 No.-
It is important to estimate progress of the tool wear of press working, because the tool wear cause low precision products. So, the aim of this research is establishment in a monitoring technique of press tool wear. Acoustic emission (AE) were measured during high precision blanking. An auto-regressive (AR) model analysis were conducted for the AE signals. Then, AR parameters obtained were analyzed with principal component analysis, which is one of multivarate analysis method. The correlations between the change in AR parameters and the degree of the progress of the tool wear were examined. The possibility of monitoring of the tool wear for the press working was indicated.