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A Simple Method for Estimation of Maximum Spurious Radiation Level from Phased Array Antennas
Yasuharu Masuda,Masahiro Tanabe,Mitsuyoshi Shinonaga 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
According to the new ITU regulation on unwanted spurious emissions from radar transmit antenna, it hasbecome compulsory to measure transmit antenna patterns at spurious frequencies. However, the complex nature of phased array antennas, involving a large number of antenna elements with element-by-element phase-control for beam-scanning, usually makes it difficult to measure all the radiation patterns at spurious frequencies. This paperintroduces our approach to this problem, where, under the principle of pattern multiplication, the spurious radiationmaxima are estimated by the multiplication between calculated array-factors and measured element-factors, both at spurious frequencies. Among those antenna element types we have examined, this paper deals with the case for dipole antenna as the most typical array antenna element.
A Detection Method for Liver Cancer Region Based on Faster R-CNN
Muki FURUZUKI,Huimin LU,Hyoungseop KIM,Yasushi HIRANO,Shingo MABU,Masahiro TANABE,Shoji KIDO 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In recent years, liver cancer has become the fourth-largest number of deaths in the world. Surgery is a typical treatment for liver cancer. Therefore, advance information about the number and size of cancer is important for surgery. Multi-phase CT images are well known diagnostic method. By extracting the region of the liver and the region of cancer from the obtained CT image, the shape can be finally restored in 3D. In this paper, as a preliminary step to construct an image analysis method for efficiently extracting cancerous regions in multi-phase CT, we propose a method of obtaining a rectangular region as a rough cancerous region of interest. As a method, after preprocessing the input image, using Faster R-CNN, the region of interest including the cancer region is extracted as a rectangle. As a result of applying this method to 11 cases of arterial phase of multi-phase CT, the detection performance was different depending on the network model adopted for backbone part.
ROI-based Fully Automated Liver Registration in Multi-phase CT Images
Kentaro SAITO,Huimin LU,Hyoungseop KIM,Shoji KIDO,Masahiro TANABE 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
In this paper, we propose a registration method for fully automated liver tumor detection. Multiple phases CT is used for the detection of the liver tumor because multiple phase CT can give different characteristic features of lesions for each time phases. Registration accuracy is important when obtaining image features from multiple time phases. However, since each time phases have different image density characteristics, therefore registration of multi-phase CT is a challenging task. In this paper, we propose a robust initial alignment method independent of changing image density features in each time phase, and deformable registration method with region of interests (ROI) as liver region extracted by U-Net. Our proposed method is evaluated on 15 patient image sets. This method is applied to the early arterial phase and the equilibrium phase to registries. Experimental results show that segmentation of early arterial phase is 83% and registration is 93% accuracy.
X-Band GaN HEMT Advanced Power Amplifier Unit for Compact Active Phased Array Antennas
Yuusuke Yamashita,Taihei Nakada,Tsuyoshi Kumamoto,Ryota Suzuki,Masahiro Tanabe 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A compact power amplifier unit for X-band solid-state Active Phased Array Antennas (APAAs) has been developed. Its major features are, (1) high power GaN (Gallium Nitride) HEMT is employed, (2)16 transmit MICmodules are arrayed in line on a thin flat printed wiring board (PWB), (3) output power is 30W (pulse) at eachtransmit-output port of the unit, hence 480 W in total, and (4) other necessary functions for phased array antennas, such as digital phase-shifters and RF dividers, are all included in this PWB. Resulting electrical measured data are presented in detail in the paper, proving that further power and frequency range increase for APAAs would become feasible by the concepts employed in this unit design.