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Automatic Control for Chase Aircraft
Yamasaki, Takeshi,Enomoto, Keisuke,Tanaka, Daiki,Tanaka, Daiki,Baba, Yoriaki The Korean Society for Aeronautical and Space Scie 2006 International Journal of Aeronautical and Space Sc Vol.7 No.2
Many kinds of unmanned aerial vehicles (UAVs) have been developed for a few decades and some of them are now in operational use. Although each UAV as well as a piloted aircraft might have restrictions to execute some tasks simultaneously or to carry some payloads, one with an automatic chase aircraft might have the potential of multi-capabilities to conduct a variety of missions or to carry more storages. This paper introduces a chase UAV control system to enhance a leader (reference) aircraft capability which has storage restriction. The automatic chase guidance and control system will be introduced with the pure pursuit guidance law combined with relative velocity error corrections, and a dynamic inversion technique in order to generate the guidance forces.
Automatic Control for Chase Aircraft
Takeshi Yamasaki,Keisuke Enomoto,Daiki Tanaka,Hiroyuki Takano,Yoriaki Baba 한국항공우주학회 2006 International Journal of Aeronautical and Space Sc Vol.7 No.2
Many kinds of unmanned aerial vehicles (UAVs) have been developed for a few decades and some of them are now in operational use. Although each UAV as well as a piloted aircraft might have restrictions to execute some tasks simultaneously or to carry some payloads, one with an automatic chase aircraft might have the potential of multi-capabilities to conduct a variety of missions or to carry more storages. This paper introduces a chase UAV control system to enhance a leader (reference) aircraft capability which has storage restriction. The automatic chase guidance and control system will be introduced with the pure pursuit guidance law combined with relative velocity error corrections, and a dynamic inversion technique in order to generate the guidance forces.
High-Resolution Optical Measurement of Fiber Optics Transmission Line Length
Takeshi Tsujimura,Koichi Yoshida,Kuniaki Tanaka,Kazunori Katayama,Yuji Azuma,Masahiko Mikawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper studies a frame-loss-free shunt system for broadband optical fiber transmission lines. This system switches transmitting optical pulses between duplicated optical fibers to avoid any interruption to communication. A high-resolution measurement technique is necessary to evaluate the optical fiber length. We applied an interferometry technique to adjust 15 km duplicated optical lines at a resolution of 10 mm. An optical line switching system and procedure are designed for use in replacing in-service optical lines. A free space optics (FSO) system adjusts the length of an in-service optical line by up to 100 m. A gigabit ether-passive optical network (GE-PON) line is successfully replaced with an extended line while maintaining transmission.
Takeshi Ueda,Tetsuya Tanaka,Yuki Kirihataya,Chisato Hara,Atsushi Yoshimura 대한내시경로봇외과학회 2023 Journal of Minimally Invasive Surgery Vol.26 No.4
Left-sided gallbladder is a rare finding that is mostly discovered incidentally during surgery and is often associated with anatomic anomalies. We herein report a case in which laparoscopic cholecystectomy and common bile duct exploration were achieved for an 89-year-old female patient with left-sided gallbladder. Surgery was carried out using our usual trocar position. Calot triangle was covered by the body of the gallbladder and could not be detected. We dissected the gallbladder from the fundus towards the neck. The cystic duct joined the common bile duct from the right side, and common bile duct exploration was performed routinely without perioperative comorbidities. Although the preoperative diagnosis rate is low and the risk of intraoperative bile duct injuries in patients with left-sided gallbladder is high, laparoscopic cholecystectomy and common bile duct exploration can be safely performed by understanding the location and bifurcation of the cystic duct.
Dynamic Simulation of Product Deformation in Rapid Prototyping
Kishinami, Takeshi,Tanaka, Fumiki,Tadaki, Toshihide 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
One of the most important factors in determining accuracy in stereolithography is the deformation phenomenon caused by the volume shrinkage of resins that accompanies photopolymerization. The objective of the work described in this paper is to perform finite element analysis of this deformation of parts built by stereolithography. We propose an element division method for the analysis of shape and dynamic resin material models based on the properties of resin after photopolymerization. Utilizing these, we will demonstrate simulation parts building, and demonstrate the usefulness of them and influence of their parameters on the deformation of parts.
Reduction of Intestinal Polyp Formation in Min Mice Fed a High-Fat Diet with Aloe Vera Gel Extract
Chihara, Takeshi,Shimpo, Kan,Beppu, Hidehiko,Tomatsu, Akiko,Kaneko, Takaaki,Tanaka, Miyuki,Yamada, Muneo,Abe, Fumiaki,Sonoda, Shigeru Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.7
Aloe vera gel supercritical $CO_2$ extract (AVGE) has been shown to contain five phytosterols, reduce visceral fat accumulation, and influence the metabolism of glucose and lipids in animal model experiments. Recent epidemiologic studies have shown that obesity is an established risk factor for several cancers including colorectal cancer. Therefore, we examined the effects of AVGE on intestinal polyp formation in Apc-deficient Min mice fed a high-fat diet. Male Min mice were divided into normal diet (ND), high fat diet (HFD), low dose AVGE (HFD+LAVGE) and high dose AVGE (HFD+HAVGE) groups. The ND group received AIN-93G diet and the latter 3 groups were given modified high-fat AIN-93G diet (HFD) for 7 weeks. AVGE was suspended in 0.5% carboxymethyl cellulose (CMC) and administered orally to mice in HFD+LAVGE and HFD+HAVGE groups every day (except on Sunday) for 7 weeks at a dose of 3.75 and 12.5 mg/kg body weight, respectively. ND and HFD groups received 0.5% CMC alone. Between weeks 4 and 7, body weights in the HFD and HFD+LAVGE groups were reduced more than those in the ND group. However, body weights were not reduced in the HFD+HAVGE group. Mice were sacrificed at the end of the experiment and their intestines were scored for polyps. No significant differences were observed in either the incidence and multiplicity of intestinal polyps (${\geq}0.5$ mm in a diameter) among the three groups fed HFD. However, when intestinal polyps were categorized by their size into 0.5-1.4, 1.5-2.4, or ${\geq}2.5$ mm, the incidence and multiplicity of large polyps (${\geq}2.5$ mm) in the intestine in the HFD+HAVGE group were significantly lower than those in the HFD group. We measured plasma lipid (triglycerides and total cholesterol) and adipocytokine [interleukin-6 and high molecular weight (HMW) adiponectin] levels as possible indicators of mechanisms of inhibition. The results showed that HMW adiponectin levels in the HFD group were significantly lower than those in the ND group. However, the levels in the HFD+HAVGE group were significantly higher than those in the HFD group. These results indicate that HAVGE reduced large-sized intestinal polyps and ameliorated reduction in plasma HMW adiponectin levels in Min mice fed HFD.