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김수용(Kim, Su-Yong),임준호(Lim, Jun-Ho),석근영(Seok, Keun-Young),김기철(Kim, Gee-Cheol),강주원(Kang, Joo-Won) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.7
The weight of hollow slab system is not increased greatly with an incremental increase in its thickness. And the flexural stiffness of a hollow slab is not significantly lower than that of a general slab. There has been a growing need for hollow slab system, because long span structures are in great demand. But, the problem is occurred by vibration of floor slabs frequently in a long span structure. And the dynamic characteristics of a hollow slab system are quite different from the conventional floor system. It is required to investigate the safety and the serviceability of hollow slab. Therefore, there are a necessity for accurate vibration analysis. Hollow slab should be modeled by refined mesh for accurate vibration analysis. As the mesh of hollow slab is refined, the number of divided elements increases in numerical analysis. The number of node is increased and numerous computer memories or computational time are required. So it is very difficult to analyze refined model of hollow slab by using the commercial programs. For the efficiency of the Static Analysis, an equivalent plate slab model is used to represent static behavior of a one-way hollow slab system relatively precisely. In conclusion, equivalent plate models present the static characteristics of one-way hollows relatively precisely.
유한요소법을 이용한 V형상 극변환 메모리 모터의 특성 분석
김영현(Young-Hyun Kim),김수용(Su-Yong Kim),김정우(Jung-Woo Kim),이중호(Jung-Ho Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.6
The Permanent Magnet (PM) machine used at speed control using field-weakening control method. But the field-weakening current, which reduces the field flux for high speeds, causes significant copper and core losses. Therefore, this paper deals with the PM performance evaluations in a pole changing memory motor (PCMM). The PCMM can change the number of magnetic poles and produce two types of torque. When the motor operates with eight poles, it produces a magnetic torque at low rotational speeds. When the motor changes to four poles, it produces both magnetic torque and reluctance torque at high speeds. The paper explain the principle and basic characteristics of the motor by using a finite element method magnetic-field analysis, which consists of a PM magnetized by a pulse d-axis current of the armature winding. The results of our experiment show that the proposed motor reduces core loss by 10% and 55% under no-load and load conditions, and doubles the speed range of the motor.
최훈국,유동윤,손익부,노영철,김영식,김수용,김완춘,김진봉,Choi, Hun-Kook,Yoo, Dongyoon,Sohn, Ik-Bu,Noh, Young-Chul,Kim, Young-Sic,Kim, Su-yong,Kim, Wan-Chun,Kim, Jin-Bong 한국레이저가공학회 2015 한국레이저가공학회지 Vol.18 No.1
In this paper, micro trench structure is fabricated by femtosecond laser for inserting optical reflecting wavelength filter in planar waveguide. The width and depth of the trench is controlled by femtosecond laser machining condition. Also, large scale of single channel with 500um and 1000um on silica plate is fabricated by femtosecond laser, and roughness of the channel surface is polished by $CO_2$ laser for the insertion of the filter. Then, the characteristic of the planar waveguide inserted the filter is verified.