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차량용 가변사판식 압축기의 흡입체크밸브 최적화에 관한 연구
이봉섭(Bongsub Lee),이용주(Yongju Lee),이태진(Taejin Lee),한준석(Junseok Han),배인표(Inpyo Bae),이건호(Geonho Lee) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Development of a compressor for vehicle air conditioning system has been focused on high performance and noise reduction. Suction check valve is used to prevent the noise that is caused by the suction pulsation when a clutch-less compressor is operating in an OFF state. However, the suction pressure drop due to the increased flow resistance reduces the cooling capacity of a compressor. The aim at this study is to predict the cooling capacity drop rate and improving the performance with optimized suction check valve shapes. It proposed the theoretical cooling capacity drop rate, and the experimental studies were carried out in order to verify this. But those were not matched each other so that CFD analysis program was used to look for the cause. Results show that the pressure distribution of a valve surfaces affects the suction pressure drop. The cooling capacity was improved by the suction check valve that is modified to increase average pressure on a valve surface.
p‐Type Conduction Characteristics of Lithium‐Doped ZnO Nanowires
Lee, JunSeok,Cha, SeungNam,Kim, JongMin,Nam, HyeWon,Lee, SangHyo,Ko, WonBae,Wang, Kang L.,Park, JeaGun,Hong, JinPyo WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.36
<P><B>p‐type ZnO nanowires (NWs) based on a simple hydrothermal technique with a lithium dopant</B> are demonstrated. It is demonstrated that Li substitution of Zn occurrs because of thermally induced migration due to post‐annealing in the presence of oxygen. The stable formation of p‐type ZnO:Li NWs is revealed using a NW field‐effect transistor and a simple n‐type ZnO thin film/p‐type annealed ZnO:Li NW homojunction diode.</P>
Test of Global Positioning System?Inertial Measurement Unit Performance for Surveying Road Alignment
Lee, JunSeok,Yun, DukGeun,Sung, Junggon Transportation Research Board, Commission on Socio 2012 TRANSPORTATION RESEARCH RECORD Vol.2282 No.-
<P> In an effort to shift road alignment surveying from manual to automatic methods, moving objects-such as a vehicle on which a Global Positioning System-inertial measurement unit (GPS-IMU) is mounted-are being used to perform surveys and obtain more accurate results. Two road alignment survey methods are compared: an affordably priced microelectromechanical system (MEMS) GPS-IMU and a high-priced fiber-optic-type GPS-IMU. Cross-section angle values from a stationary laser scanner survey and a GPS-IMU survey are compared to determine whether the roll attitude value of GPS-IMU can be used to ensure a more accurate comparison of the cross-section angle. In addition, GPS-IMU performance is compared under various test conditions to survey road alignment, and results indicate that the fiber-optic GPS-IMU is needed to ensure accuracy within the 10% margin of error required for road alignment. In a test conducted to verify whether the roll value of a vehicle can be used as is to survey the cross-section angle of a road, the values from GPS-IMU, drawing, and laser were within a 1% margin of error. Thus, it would be possible to use the roll value obtained from a vehicle as is to survey the road cross-section angle accurately. </P>
SCHWARTZ P SURFACES FOR TISSUE SCAFFOLDS
Junseok KIM,Joong Yeon LIM,Seonggi KIM,Darae JEONG,Hyun Geun LEE,Dongsun LEE,Jaemin SHIN 한국산업응용수학회 2010 한국산업응용수학회 학술대회 논문집 Vol.5 No.2
Tissue scaffolds provide temporary mechanical support for tissue regeneration while shaping ingrowth tissues. Therefore tissue scaffolds should be biocompatible, biodegradable with appropriate porosity, pore structure, and pore distribution. The design of optimized tissue scaffolds based on the fundamental knowledge of its microstructure is an important issue. In this paper, we generate the Schwarz primitive (P) surface with various volume fractions and explore its use. The Schwarz primitive (P) surface enable the design of vary high surface-to-volume ratio structure with high porosity and mechanical properties.
Flexible printed circuit board actuators
Lee, Junseok,Cha, Youngsu IOP 2017 Smart materials & structures Vol.26 No.12
<P>Out-of-plane actuators are made possible by the breaking of planar symmetry. In this paper, we present a thin-film out-of-plane electrostatic actuator for a flexible printed circuit board (FPCB) that can be fabricated with a single step of the conventional manufacturing process. No other components are required for actuation except a single sheet of the FPCB, and it works based on the planar asymmetry resulting from asymmetrically patterned top and bottom electrodes on each side of the polyimide film. With the structural asymmetry, the application of a high voltage in the order of kilovolts results in the asymmetry of the electric fields and the body force density, which generates the bending moment that leads to macroscopic deformations. We applied the finite element method to examine the asymmetry induced by the difference in the electrodes. In the experiment, the displacement responses to step input and square wave input of various frequencies were analyzed. It was found that our actuator constitutes an underdamped system, exhibiting resonance characteristics. The maximum oscillatory amplitude was determined at resonance, and the relationship between the displacement and the applied voltage was investigated.</P>