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Study on the Contra-Rotating Propeller system design and full-scale performance prediction method
Keh-Sik Min,Bong-Jun Chang,Heung-Won Seo 대한조선학회 2009 International Journal of Naval Architecture and Oc Vol.1 No.1
A ship’s screw-propeller produces thrust by rotation and, at the same time, generates rotational flow behind the propeller. This rotational flow has no contribution to the generation of thrust, but instead produces energy loss. By recovering part of the lost energy in the rotational flow, therefore, it is possible to improve the propulsion efficiency. The contra-rotating propeller (CRP) system is the representing example of such devices. Unfortunately, however, neither a design method nor a full-scale peiformance prediction procedure for the CRP system has been well established yet. The authors have long performed studies on the CRP system, and some of the results from the authors’ studies shall be presented and discussed.
Relativistic Quantum Collision Theory for Many-particle Systems
Keh-Ning Huang,Hsiao-Ling Sun,Sheng-Fang Lin,Hao-Tse Shiao,Xin-Zeng Wu 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.41
Starting from the relativistic equation of motion governing quantum collision processes, we shall formulate the relativistic quantum collision theory in an ab-initio manner. Quantum electrodynamic effects are, however, incorporated perturbatively. Because heavy projectiles or ultra-high incident energies are considered, the recoil of the target is also treated. Electron-impact ionization of the uranium ion U^(91+) and proton-impact ionization of hydrogen will be given as examples.
Robust Controller Design for a Stabilized Head Mirror
Keh, Joong-Eup,Lee, Man-Hyung Korean Society for Precision Engineering 2002 International Journal of the Korean Society of Pre Vol.3 No.4
In this paper, LMI (Linear Matrix Inequality) based on H$\_$$\infty$/ controller for a lire of sight (LOS) stabilization system. It shows that the proposed controller has more excellent stabilization performance than that of the conventional PI-Lead controller. An H$\_$$\infty$/ control has been also applied to the system for reducing modeling errors and the settling time of the system. The LMI-based H$\_$$\infty$/ controller design is more practical in view of reducing a run-time than Riccati-based H$\_$$\infty$/ controller. This H$\_$$\infty$/ controller is available not only to decrease the gain in PI-Lead control, but also to compensate the identifications for the various uncertain parameters. Therefore, this paper, shows that the proposed LMI-based H$\_$$\infty$/ controller had good disturbance attenuation and reference input tracking performance compared with the control performance of the conventional controller under any real disturbances.
SINICA CORPUS; Design Methodology for Balanced Corpora
( Keh Jiann Chen ),( Chu Ren Huang ),( Li Ping Chang ),( Hui Li Hsu ) 한국언어정보학회 1996 국제 워크샵 Vol.1996 No.-
The Academia Sinica Balanced Corpus (Sinica Corpus) is the first balanced Chinese corpus with part-of-speech tagging. The corpus (Sinica 2.0) is open to the research community through the WWW (http://www.sinica.edu.tw/ftms-bin/ kiwi.sh). Current size of the corpus is 3.5 million words, and the immediate expansion target is five million words. Each text In the corpus is classified and marked according to five criteria: genre, style, mode, topic, and source. The feature values of these classifications are assigned in a hierarchy. Subcorpora can be defined with a specific set of attributes to serve different research purposes. Texts in the corpus are segmented according to the word segmentation standard proposed by the ROC Computational Linguistic Society. Each segmented word is tagged with its part-of-speech. Linguistic patterns and language structures can be extracted from the tagged corpus via a corpus inspection program which has the functions of KWIC searching, filtering, statistics, printing, and collocation.