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Minamitani, Haruyuki,Ehara, Hiroyuki,Sekizuka, Eiichi,Oshio, Chikara 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
An optical-fiber-array spatial filtering velocimeter (SFV) was developed and applied to the flow velocity measurement in the microscopic region. A frequency shifter was assembled in the signal processing unit of the velocimeter, and it enabled detection of the direction of flow which often changed reversely. The structure of the SFV was very simple and was available to be installed in a microscope. Output signals of the SFV were detected by photodetectors and processed by means of FFT to obtain the spectral frequency related to the flow velocity. The whole system was tested both in vitro and in-vivo, and especially used to measure the velocity changes of lymph flow and blood flow in the microcirculatory system of the rats. The results showed that the developed SFV was conspicuously useful for the velocity measurement even in the microscopic region.
Applying MSC-HOG Feature to the Detection of a Human on a Bicycle
Heewook Jung,Yusuke Ehara,Joo Kooi Tan,Hyoungseop Kim,Seiji Ishikawa 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Traffic accidents are decreasing under the influence of technology advancement. But the problems still remain that accidents occur due to carelessness of drivers. Therefore many researchers have been still studying to realize an advanced safety system. The Histograms of Oriented Gradients (HOG) feature is well known as a useful method of detecting a standing human in various kinds of the background. Unlike a human, a bicycle changes its appearance variously according to viewpoints. Hence, it is more difficult than detecting a human. In this paper, we propose a method of detecting a human on a bicycle using the Multiple-size Cell HOG (MSC-HOG) feature and the RealAdaboost algorithm. Experimental results and evaluation show satisfactory performance of the proposed method.
Ryu, Myon-Ok,Ehara, Shozo 한국곤충학회 1990 Entomological Research Vol.20 No.3
한국산 이리응애를 동정한 결과, Typhlodromus (Paraseiulus) deogyuensis n. sp. (느릅이리응애, 신칭) 1신종과 A. (A.) finlandicus(순이리응애, 신칭) 1종의 한국미기록종을 확인하였다. A. (A.) eharai는 전에 A. (A.) deleoni로 보고되있었다. 이로써 한국산 이리응애는 모두 8종이 된다. Typhlodromus (Paraseiulus) deogyuensis, n. sp. is described from Mujugucheondong, Tokyusan, Muju, Chonbuk. Amblyseius (Amblyseius) eharai Amitai et Swirski and A. (A.) finlandicus (Oudemans) are recorded from Korea for the first time. A. (A.) eharai was recently reported from this country under the name A. (A.) deleoni Muma et Denmark.
양상모,신영재,Yoshitaka Ehara,Hiroshi Funakubo,윤종걸,James F. Scott,노태원 한국물리학회 2019 Current Applied Physics Vol.19 No.4
Recently, in ferroelectric materials, there have been many experimental efforts to find out more intriguing topological objects and their functionalities, such as conduction property. Here we investigated ferroelectric domain structures and related topological defects in the (111)-oriented epitaxial tetragonal PbZr0.35Ti0.65O3 thin film. Systematic piezoresponse force microscopy measurements revealed that the field-induced polarization switching can form thermodynamically stable superdomain structures composed of nano-sized stripe subdomains. Within such superdomain structures, we observed the exotic equilateral triangular in-plane flux-closure domains composed of three stripe domain bundles with 120/120/120 degrees of separation. The conductive- atomic force microscopy measurements under vacuum showed that some vertices have significantly higher conductivity compared to other surrounding regions. This work highlights electric field-driven polarization switching and unique crystallographic symmetry (here, three-fold rotational symmetry) can generate exotic ferroelectric domain structures and functional topological defects, such as conductive vertices.
Evaluation of subsurface thermal environmental change caused by a ground-coupled heat pump system
Yasuhiro Fujimitsu,Koichiro Fukuoka,Sachio Ehara,Hiroto Takeshita,Fuminori Abe 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The authors have been conducting demonstration and performance assessment of the ground-coupled heat pump (GCHP) system optimized for the air conditioning system of an experimental house in the artificial island in Fukuoka City, Japan, since 2005 to evaluate the subsurface thermal environmental changes caused by heat exchange with the ground. The authors monitored the underground temperature and groundwater level in some observation wells around the heat exchanging well, and performed numerical simulation of the underground temperature change with a groundwater simulator ‘‘FEFLOW”. The simulation result for a 20-year operation by using the numerical model, which had replicated the measured heat exchange rate during the 40-day heating operation from 15 December 2006, predicted that the cumulative increase or decrease of subsurface temperature will not be seen. Therefore, it is thought that there is little impact to the subsurface thermal environment around this GCHP system.
Microgravity method to model mass balance in the Kamojang Geothermal Field
Yayan Sofyan,Yunus Daud,Yustin Kamah,Sachio Ehara 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Indonesia has the largest geothermal resource potential in the world, with total energy potential about 27.5 GWe. Kamojang Geothermal Field is the oldest geothermal field in Indonesia. More than 116.78 × 106 ton of steam has been exploited from the Kamojang Geothermal Field between 1983 and 2000. Today, the production decline problem at the Kamojang Geothermal Field needs to be solved by reservoir management. Reservoir management is used to solve and to maintain the stability of the steam production which is influenced by reservoir mass balance. The periodic changes of reservoir condition can be measured by the microgravity method. Between 1999 and 2005, microgravity method was used in The Kamojang Field to measure the changes of the gravity values with 51 gravity benchmarks. Mass changes in the geothermal reservoir were calculated in the same period based on Gauss theory. The interpretation of the microgravity data at Kamojang Geothermal Field shows the mass balance model in the reservoir. In six years production period, the microgravity method indicated that Kamojang Geothermal Field has a mass decrease of about 3.34 Mt/year and 2.73 Mt/year is estimated as the natural recharge. It is very important to balance the mass to continue sustainable production.