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Pulse Generators and High-Voltage Units with Automatic Controllers for Electrostatic Precipitators
Jorgensen Anders Korea Cement Association 1991 시멘트 심포지움 Vol.19 No.-
The electrostatic precipitator is known to the cement industry as the preferred dedusting equipment for the main dust emission sources. To understand the function better, a short description of the theory of precipitation is presented, with the factors in
On the nonlinear structural analysis of wind turbine blades using reduced degree-of-freedom models
Holm-Jorgensen, K.,Staerdahl, J.W.,Nielsen, S.R.K. Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.28 No.1
Wind turbine blades are increasing in magnitude without a proportional increase of stiffness for which reason geometrical and inertial nonlinearities become increasingly important. Often these effects are analysed using a nonlinear truncated expansion in undamped fixed base mode shapes of a blade, modelling geometrical and inertial nonlinear couplings in the fundamental flap and edge direction. The purpose of this article is to examine the applicability of such a reduced-degree-of-freedom model in predicting the nonlinear response and stability of a blade by comparison to a full model based on a nonlinear co-rotating FE formulation. By use of the reduced-degree-of-freedom model it is shown that under strong resonance excitation of the fundamental flap or edge modes, significant energy is transferred to higher modes due to parametric or nonlinear coupling terms, which influence the response and stability conditions. It is demonstrated that the response predicted by such models in some cases becomes instable or chaotic. However, as a consequence of the energy flow the stability is increased and the tendency of chaotic vibrations is reduced as the number of modes are increased. The FE model representing the case of infinitely many included modes, is shown to predict stable and ordered response for all considered parameters. Further, the analysis shows that the reduced-degree-of-freedom model of relatively low order overestimates the response near resonance peaks, which is a consequence of the small number of included modes. The qualitative erratic response and stability prediction of the reduced order models take place at frequencies slightly above normal operation. However, for normal operation of the wind turbine without resonance excitation 4 modes in the reduced-degree-of-freedom model perform acceptable.
John Jorgensen 서울대학교 규장각한국학연구원 2008 Seoul journal of Korean studies Vol.21 No.1
Korean Buddhism needs to be studied at the national, regional and local levels, and their interrelationships clarified. This is a study of how Ssanggye Monastery tried to preserve its independence in the face of natural disasters, monastic rivalries and colonial interventions. The monastery, associated with Huineng (d. 713), the founder of Chan, in an 887 stele written by Ch’oe Ch’iwŏn, is not mentioned properly again until 1489 and then again in 1854, when it was destroyed by a landslide. It used the association with Huineng to finance the rebuilding. In 1914, a propaganda campaign asserted that a relic of Huineng existed in the monastery and had started emitting miraculous lights. The temple relied on a text allegedly written in 1103 by Kakhun, actually the author of the 1215 Haedong Kosŭng chŏn. I conclude that Ssanggye monks were attacking Yi Hoegwang, for Yi was pro-Japanese, he had discovered Kakhun’s text, and was abbot of Haein Monastery, which the Japanese authorities had made overlord of Ssanggye Monastery. He was thus accused of betraying Korean Sŏn. The two monasteries remained in conflict to the 1920s, and so the relic campaign was meant to show the Buddha’s approval of Ssanggye Monastery and disapproval of Haein Monastery and its traitorous abbot.
Goguryeo Buddhism: An Imported Religion in a Multi-ethnic Warrior Kingdom
John Jorgensen 한국학중앙연구원 한국학중앙연구원 2012 THE REVIEW OF KOREAN STUDIES Vol.15 No.1
The scanty evidence from histories, inscriptions on Buddhist statues, and tomb excavations shows that Goguryeo Buddhism had only a short history from ca. 400 CE until the collapse of the kingdom. This Buddhism was largely that of prayers for benefits and was probably centered on the royal court and supported by Han Chinese and Xianbei settlers. Buddhism was introduced into Goguryeo from Xianbei dominated regimes that controlled the north China plain, and a key site related to this introduction seems to have been Shentong Monastery in Shandong Province. It is likely that Seungnang, championed as the only known Buddhist scholar from Goguryeo, was not from Goguryeo. That Buddhism had only shallow roots in Goguryeo is demonstrated by the lack of Buddhist cave complexes, cliff engravings or large statues, and by the ease with which the last Goguryeo rulers shifted support towards Daoism.