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RISS 인기검색어
- 검색키워드
- 저자 : Koji Yonemoto (검색결과 3 건)
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Hybrid Optimal Trajectory Generation Using Genetic Algorithm and Sequential Quadratic Programming
Koji Okuda,Koichi Yonemoto,Tomoki Akiyama 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The maximum performance is required for the space plane which will be realized in future. Thus, the efficient real-time calculation method for the trafectory optimization is required. The Space Systems Laboratory of Kyushu Institute of Technology has been studying the winged rocket development program as a research subject of fully reusable space transportation systems. This paper proposes an optimization trajectory method for winged rocket aiming at onboard real-time calculation. The present optimization employs a technique to solve the equations of motion directly with the control input function, which has variable coefficients for optimization. As the results, the optimization variables are reduced and the initial conditions are satisfied. GA(Genetic Algorithm) provides an initial solution of variable coefficients of the control input function for SQP(Sequential Quadratic Programming) method. This optimization algorithm using GA for initial solution and SQP for fine solution reduces the total calculation time and improves the accuracy.
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Experimental Flight of KIT Student’s Rocket in France
Koji Okuda,Yuji Ujimoto,Yuta Otsuka,Takaya Sato,Takuya Shidooka,Daijiro Semba,Kenichi Tominaga,Junichi Fukuda,Yuta Yamamoto,Kazuki Wada,Shinichi Sagara,Koichi Yonemoto 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
KIT Student's Rocket has been developed by a student group of Kyushu Institute of Technology lor rocket launch campaign held at La Courtine in France since 2006. This paper introduces the newest design of rocket. The rocket has the body length of 2120㎜, and weighs 14.6㎏ and can reach to an altitude of about 700㎜ by a solid rocket motor provided by CNES (the French Centre National D’Etudes Spatiales). The rocket is controlling rolling attitude during ascent phase and then deploying a parafoil at the apogee of the trajectory for recovery guidance to an aiming point.
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Kouichiro Kawano,Naotake Tsuda,Shin Nishio,Koji Yonemoto,Kazuto Tasaki,Rurika Tasaki,Kimio Ushijima 대한부인종양학회 2016 Journal of Gynecologic Oncology Vol.27 No.5
Objective: To identify key factors for predicting positive cone margin and appropriate conelength. Methods: We retrospectively reviewed the margin status of patients who received conizationwith high grade cervical intraepithelial neoplasia, along with other factors such as patientage, parity, preoperative cytology, size of disease, type of transformation zone, and conelength from patient records. Cut-off value of cone length was analyzed in women youngerthan 40 years old because we design conization with minimum length especially forwomen who wish for future pregnancy. Cut-off value of cone length was defined as lengthcorresponds to estimated probability of positive cone margin equal to 0.1 by logisticregression analysis with variables selected by stepwise methods. Results: Among 300 patients, 75 patients had positive cone margin. Multivariable analysisrevealed that squamous cell carcinoma at preoperative cytology (p=0.001), 2 or morequadrant disease (p=0.011), and shorter cone length (p<0.001) were risk factors for positivecone margin. Stepwise methods identified cone length and size of lesion as importantvariables. With this condition, cut-off value of cone length was estimated as 15 mm in singlequadrant disease and 20 mm in 2 or more quadrant disease, respectively. Conclusion: We identified the independent risk factors of positive cone margin and identifiedthe cut-off value of cone length to avoid positive cone margin in women younger than 40years old. Conization should be performed not only according to colposcopic findingsincluding type of transformation zone but size of disease and cone length.
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