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- 저자 : 박낙규(Nak Kyu Park) (검색결과 20 건)
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박낙규(Nak-Kyu Park),이근영(Kun-Young Lee),강영준(Young-Jun Kang),강신재(Shin-jae Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Laser interferometry is widely used as a measuring system in many fields because of its high resolution and its ability to measure a broad area in real-time all at once. In conventional laser interferometry, for example Out-of-plane ESPI (Electronic Speckle Pattern Interferometry), In plane ESPI, Shearography and Holography, it uses PZT or other components as a phase shift instrumentation to extract 3-D deformation data, vibration mode and others. However, in most cases PZT has some disadvantages, which include nonlinear errors and limited time of use. In the present study, a new type of laser interferometry using a laser diode is proposed. Using Laser Diode Sinusoidal Phase Modulating (LDSPM) interferometry, the phase modulation can be directly modulated by controlling the laser diode injection current thereby eliminating the need for PZT and its components. This makes the interferometry more compact. This paper reports on a new approach to the LD Modulating interferometry that involves four-frame phase shift method. This study proposes a four-frame phase mapping algorithm, which was developed to have a guaranteed application, to stabilize the system in the field and to be a user-friendly GUI. In this paper, the theory for LD wavelength modulation and sinusoidal phase modulation of LD modulating interferometry is shown. Four-frame phase mapping algorithm is then introduced.
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박낙규 ( Nak Kyu Park ),서진희 ( Jin He Seo ) 서울대학교 인문학연구원 2001 人文論叢 Vol.45 No.-
It is said that Confucianism ruled almost all fields of traditional C and chinese art theory was not an exception of it. A new form of Confuc(Neo-Confucianism) was built in Sung dynasty and its influence on ar was the same as before. Traditionally, Confucianism had a negative pe about art. It was because art interfered with the cultivation of pers essay will inquire into a possibility of affirmative viewpoint of art such a characteristic of Confucianism especially Neo-Confucianism dynasty. In Sung dynasty the most eminent art theorist was Su Shi(蘇軾), main stream of Confucianism in Sung dynasty was that of from Zhou Dun Yi(敦?) to Zhu Xi(朱熹) and it was Sung-Ming Li-Xue(宋明理學) that led Ch culture in general after Sung dynasty. Therefore, though art theory dynasty was influenced by Su Shi, it was within the boundary offe Neo-Confucianists. The examples of the art theory of Li-Xue were "wen Yi Zai Dao"(文以? Art is the means of transferring Dao) and "wan u Sang Zhi"(玩物喪志: B indulged in exterior things makes one lose his intention). It is certa assertions played a negative role in art and art theory at that time factors of Li-Xue, for example "Tian Ren He Yi"(天人合一), became foundation of the later art theory. It is a matter of course that Li-Xu persist throughout later ages, and the reason was the self-contradictor -the relation of nature(性), sentiment(情) and mind(心). A new trend o art theory in later ages could emerge by breakthrough of the contradicto In conclusion, Li-Xue in Sung Dynasty had influence on art and art thlater ages in different ways. On the one hand it had a negative influence on art and art theory in that ignored the value of art itself. On the other hand, it presented the value that art should pursue such as Dao, Tian Ren He Yi, etc. Furthermore, decisively it offered the bases of possibility and limit of chinese art and art theory at that time and of later ages. Therefore, it is necessary to grasp the art theory of Li Xue to understand the chinese art and art theory. It is in this that the aesthetic significance of Li Xue in Sung Dynasty lies.
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이근영(Kun Young Lee),강영준(Young June Kang),박낙규(Nak Kyu Park),이동환(Dong Hwan Lee) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.3
Laser interferometry is widely used as a measuring system in many fields because ofits high resolution and ability to measure a broad area in real-time all at once. In conventional LASER interferometry, for example Out-of-plane ESPI(Electronic Speckle Pattern Interferometry), In plane ESPI, Shearography and Holography, it uses PZT or other components as a phase shift instrumentation to extract 3D deformation data. vibration mode and others. However, in most cases PZT has some disadvantages, which include nonlinear errors and limited time of use. In the present study, a new type of LASER interferometry using a laser diode is proposed. Using LASER Diode Sinusoidal Phase Modulating (LD-SPM) interferometry, the phase modulation can be directly modulated by controlling the LASER Diode injection current thereby eliminating the need for PZT and its components. This makes the interferometry more compact. This paper reports on a new approach to the LD Modulating interferometry that involves four-buckets phase shift method. This study proposes a four-bucket phase mapping algorithm, which was developed to have a guaranteed application, to stabilize the system in the field and to be a user-friendly GUI. In this paper, the theory for LD wavelength modulation and sinusoidal phase modulation of LD modulating interferometry is shown. Four-bucket phase mapping algorithm is then introduced.
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Modulating Laser 를 이용한 ESPI System algorithm 개발에 관한 연구
김성종(Seong Jong Kim),강영준(Young June Kang),박낙규(Nak Kyu Park),이동환(Dong Hwan Lee) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.7
Laser interferometry is widely used as a measuring system in many fields because of its high resolution and its ability to measure a broad area in real-time all at once. In conventional laser interferometry, for example out-of-plane ESPI (Electronic Speckle Pattern Interferometry), in plane ESPI, shearography and holography, it uses PZT or other components as a phase shift instrumentation to extract 3-D deformation data, vibration mode and others. However, in most cases PZT has some disadvantages, which include nonlinear errors and limited time of use. In the present study, a new type of laser interferometry using a laser diode is proposed. Using Laser Diode Sinusoidal Phase Modulating (LD-SPM) interferometry, the phase modulation can be directly modulated by controlling the laser diode injection current thereby eliminating the need for PZT and its components. This makes the interferometry more compact. This paper reports on a new approach to the LD (Laser Diode) Modulating interferometry that involves four-frame phase shift method. This study proposes a four-frame phase mapping algorithm, which was developed to have a guaranteed application, to stabilize the system in the field and to be a user-friendly GUI. In this paper, the theory for LD wavelength modulation and sinusoidal phase modulation of LD modulating interferometry is shown. Using modulating laser and research of measurement algorithm does comparison with existent ESPI measurement algorithm. Algorithm measures using GPIB communication through most LabVIEW 8.2. GPIB communication does alteration through PC. Transformation of measurement object measures through modulating laser algorithm that develops. Comparison of algorithm of modulating laser developed newly with existent PZT algorithm compares transformation price through 3 - D. Comparison of 4-frame phase mapping, unwrapping, 3-D is then introduced.
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朴駱圭 東亞大學校 1986 東亞論叢 Vol.23 No.1
In ancient China, Confucianists, orthdox and more practical viewers of music, regarded music as a means for political and moral influence, and they thought that the total harmony based on order and mederation is most essential in music. According to them, music symbolizes the noble personalities and political achievements of great king in ancient time, and makes contains or represent feelings and ideas in itself which can be transmitted from one to another. On the other hand, Taoists had metaphysical view that music symbolizes 'Tao', the great harmony of the real world, and spiritual pleasure resulted from being one with 'Tao'. From the 3rd century to the 6th, in spite of the political disorder and hard times, arts, literature, and the theories of arts showed a remarkable and fresh change with the back ground of the rise of Taoism: for instances, new standards in literature was suggested for evaluating literary works by aesthetic impression, and in the history of painting the landscape painting appeared for appreciating the beauty in nature and expressing some emotions and ideas through painting, while paying no attention to the morality in painting, and in music a new trend that the formalistic qualities in it give greater importance challenged the old doctrines. In such various changes in arts and literature as mentioned above, it can be found that arts and literature at the time were tinged with the autonomous theory of art to considerable extent. And this was much influenced by the Taoism. Jikang(223~262 a.d., wei dynasty) was one of the representative philosopher. Standing at the new point of view on music, he contented with a difiant attitude against the falsehood of the orthodox view which his political foes stood by for their ambition. His main points can be summed up and interpreted as follows. First, music is a physical and natural object that is real existence and has its own economy. Second, music is one thing emotions in human mind is another Music is independent from emotions and does not contain them in itself. Therefore, music does not directly excite emotions, but only stimulate human mind to express them outwardly. It is fallacious to argue that music causes certain emotions by the fact that an appreciator becomes sad, or another becomes delightful while hearing music. Music is abstract essentially so that it can not represent any object. Third, there is chance rather than necessity between a certain kind of music and the emotions excited in one's mind who hears it. Forth, appreciating in true sense requires a kind of mental attitude, "Pinghe" that does not admit any emotion to occupy mind, but keep a kind of serenity, both in case of creator and appreciator. it can be said that the pinghe has very close meaning to the aesthetic attitude. Fifth, the high value in music can be proved when the mind of creator coincides with the artistic principle of music, and music corresponds with the sincere mind of appreciator. True art can be realized in harmonious relation between subject and object. Sixth, the music created from the pinghe involves the perfect harmony based on order and moderation both in emotion and skill, and makes men come closer to the Goodness by purifying their minds, and consequently brings the world to peace. This is the true function of music.
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