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( Nozaki Kentaro ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
The development of a benthic filamentous green algal community formed by Spirogyra sp. in early summer has been observed in the littoral zones in the north basin of Lake Biwa since the 1980s. The development of a Spirogyra sp. community may have an effect on the increase in the biomass of the benthic algal community in early summer and on the alterations in seasonal fluctuation patterns of the biomass. In this mini-review, the causes underlying the development of the Spirogyra sp. community are discussed on the basis of studies in the seasonal fluctuations of benthic algal communities in littoral stony zones carried out in 1963-1964, 1995-1996 and 2000-2001, especially those focusing on the nutrient concentration (NO₃^(-1)-N). NO₃^(-1)-N concentrations in June were higher than 100 ㎍ L^(-1) in 1995 and 2000 in contrast to a concentration in June 1964 of only 20 ㎍ L^(-1). These results show that NO₃^(-1)-N concentrations throughout in 1963^(-1)964 period were considerably lower than those in 1995-1996 and 2000-2001, suggesting that the NO₃^(-1)-N concentration may have served as a limiting factor on Spirogyra sp. growth in 1963. NO₃^(-1)-N concentrations in the pelagic zone in the north basin of Lake Biwa have clearly increased from the 1950s under the impact of economic growth and the increasing population in the watershed. The development of the Spirogyra sp. community seems to be the result of a heady increase in the nutrient supply from human activities.
NOZAKI H. The Korean Society of Automotive Engineers 2006 International journal of automotive technology Vol.7 No.1
Driving simulations were performed to evaluate the effect of providing both visual information and body sensory information on changes in steering characteristics and the amount of perspiration in drift cornering. When the driver is provided with body sensory information and visual information, the amount of perspiration increases and the driver can perform drift control with a moderate level of tension. With visual information only, the driver tends to easily go into a spin because drift control is difficult. In this case, the amount of perspiration increases greatly as compared with the case where body sensory information is also provided, reflecting a very high perception of risk. When body sensory information is provided, the driver can control drift adequately, feeding back the roll angle information in steering. The importance of the driver's perception of the state of the vehicle was thus confirmed, and a desirable future direction for driver assistance systems was determined.
Simple Measurement System for Indoor Power flow Distributions using Voltmeters at Electrical Outlet
Nozaki, Yuhei,Mitani, Yasunori,Yaser, Qudaih,Watanabe, Masayuki 대한전기학회 2013 The Journal of International Council on Electrical Vol.3 No.4
In order to monitor and manage the electric power consumption and distribution in a building or a house dispersedly implemented digital power meters are utilized, while the meters are very costly due to the complicated numerical operation or due to the multi-functionality such as measurements of reactive power, power factor, integrating power and so on. Therefore a simple combination of current transformer (CT) and potential transformer (PT) with post processing of collected data is used for energy usage diagnosis process. However, as long as the power lines are usually behind the walls the CT installation is not easy. In this paper a set of voltmeters dispersedly installed at power outlets is proposed as a monitoring system for power distribution to each outlet. Experimental results show the advantage of the proposed scheme in the sense that it does not disturb the usage of electric appliances and that the system configuration is simple. The proposed system was applied to the monitoring system for avoiding overload conditions or power losses.
CONSIDERATIONS CONCERNING IMPROVEMENT OF EMERGENCY EVASION PERFORMANCE
Nozaki, H. The Korean Society of Automotive Engineers 2006 International journal of automotive technology Vol.7 No.2
When emergency evasion during running is required, a driver sometimes causes a vehicle to drift, that is, a condition in which the rear wheels skid due to rapid steering. Under such conditions, the vehicle enters a very unstable state and often becomes uncontrollable. An unstable state of the vehicle induced by rapid steering was simulated and the effect of differential steering assistance was examined. Results indicate that, in emergency evasion while cornering and during which the vehicle begins to drift, unstable behavior like spins can be avoided by differential steering assistance and both the stability and control of the vehicle is improved remarkably. In addition, reduction of overshoot during spin evasion by the differential steering assistance has been shown to enable the vehicle to return to a state of stability in a short time in emergency evasion during straight-line running. Moreover, the effectiveness of differential steering assistance during emergency evasion was confirmed using a driving simulator.
Nozaki, Takao,Park, Sun-Jin,Kong, Dongsoo The Korean Society of Systematic Zoology 2019 Animal Systematics, Evolution and Diversity Vol.35 No.1
The specimens of caddisflies previously recorded as Sortosa distincta (Walker, 1852), Rhyacophila uchidai Kobayashi, 1989, Rhyacophila jirisana Kobayashi, 1989, Crunobiodes koriaensis Kobayashi, 1989, and Ganonema odaenum Kobayashi, 1989 from South Korea were reexamined. Rhyacophila uchidai and R. jirisana are newly synonymized with R. retracta Martynov, 1914 and R. vicina Botosaneanu, 1970, respectively. We reconfirm two synonyms, C. koriaensis with Lepidostoma sinuatum (Martynov, 1935) and G. odaenum with Psilotreta locumtenens Botosaneanu, 1970, and a misidentification of Dolophilodes affinis Levanidova and Arefina, 1996 as S. distincta. Some specimens recorded as G. odaenum are identified as Psilotreta falcula Botosaneanu, 1970.
DRIVER STEERING MODEL AND IMPROVEMENT TECHNIQUE OF VEHICLE MOVEMENT PERFORMANCE DURING DRIFT RUNNING
Nozaki, H. The Korean Society of Automotive Engineers 2006 International journal of automotive technology Vol.7 No.4
The driver model during drift cornering was examined, and a technique to improve vehicle movement performance during drift cornering was investigated. Based on the results obtained, the driver was found to steer using feedback of the body slip angle and the body slip angle velocity during drift cornering. Moreover, improvement of the cornering force characteristic, at which exceeded the maximum cornering force calm as much as possible is important.
TECHNIQUE OF SEPARATE MEASURING SIDE SLIP FOR TOE ANGLE AND CAMBER ANGLE
Nozaki, H. The Korean Society of Automotive Engineers 2006 International journal of automotive technology Vol.7 No.6
The current flat type side slip tester measures only the total side slip. Therefore, measurement techniques which can be used to determine the side slip for each alignment element were examined. Because the side slip related to the camber angle varies depending on the unit load per travel wheel while the side slip related to the toe angle does not on the unit per travel wheel, but depends only on the direction of the tire, the side slip for each alignment element can be determined separately.
NOZAKI H. The Korean Society of Automotive Engineers 2005 International journal of automotive technology Vol.6 No.6
In this research, an effective technique was examined to improve the drift running performance. Concretely, the driver model by which the counter steer was done was assumed to the model by which the vehicle body slip angle (and the vehicle body slip angle velocity) was feed back. Next, the effectiveness of the system which added the assist steer angle corresponding to the steering wheel angle velocity to a front wheel steer angle was clarified as a drift running performance improvement technique of the vehicle. As a result, because the phase advances when the differentiation steer assistance is added, it has been understood to be able to cover the delay of the counter steer when the drift running. Therefore, it has been understood that the drift control does considerably easily. Moreover, it has been understood that the differentiation steer assistance acts effectively at the drift cornering by which the drift angle is maintained in cornering and the severe lane change with a drift at a situation. That is, it was understood to be able to settle to the drift angle of the aim quickly at the time of the drift cornering because the delay of the control steer angle of the counter steer was improved. Moreover, it was understood for the transient overshoot of the vehicle tracks to be able to decrease, and to return to the state of stability quickly at the severe lane change.