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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>
Lee, Junseok,Park, Juhee,Singha, Kaushik,Kim, Won Jong The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.15
<P>A photoresponsive drug releasing system based on mesoporous silica nanoparticles (MSN) was developed. A model drug was decorated on the surfaces <I>via</I> singlet oxygen sensitive linkers and a singlet oxygen-generating photosensitizer was loaded in the mesopores of the MSN. An on-demand drug releasing system was successfully developed by irradiation with long-wavelength light.</P> <P>Graphic Abstract</P><P>A photoresponsive drug releasing system based on mesoporous silica nanoparticles was developed by decorating them with a drug <I>via</I> singlet oxygen sensitive linkers and loading singlet oxygen-generating photosensitizer in the mesopores. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc38510d'> </P>
Lee, Junseok,Rhyou, Chanryeol,Kang, Byungjun,Lee, Hyungsuk Institute of Physics Publishing Ltd. 2017 Journal of Physics. D, Applied Physics Vol.50 No.16
<P>This paper describes continuously phase-modulated standing surface acoustic waves (CPM-SSAW) and its application for particle separation in multiple pressure nodes. A linear change of phase in CPM-SSAW applies a force to particles whose magnitude depends on their size and contrast factors. During continuous phase modulation, we demonstrate that particles with a target dimension are translated in the direction of moving pressure nodes, whereas smaller particles show oscillatory movements. The rate of phase modulation is optimized for separation of target particles from the relationship between mean particle velocity and period of oscillation. The developed technique is applied to separate particles of a target dimension from the particle mixture. Furthermore, we also demonstrate human keratinocyte cells can be separated in the cell and bead mixture. The separation technique is incorporated with a microfluidic channel spanning multiple pressure nodes, which is advantageous over separation in a single pressure node in terms of throughput.</P>
Concept Design of a Novel Bio-Inspired Drilling System for Shallow Drilling
Junseok Lee,Christian Tirtawardhana,Heung Woon Jang,Jung-Wuk Hong,Hyun Myung 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
As the exhaustion of resources used as existing energy such as petroleum and coal are approaching, interest in planning and research for finding new energy sources is on the rise. In addition, the use of existing energy sources is one of the main causes of environmental destruction. Energy demand is steadily increasing, and it is urgently needed to find alternative energy sources due to exhaustion and limitation of existing energy sources. The use of drilling technology is inevitable for exploring these new energy sources. However, existing drilling equipment and technologies have limitations due to the colossal size and complicated processes, and also cause environmental damage resulting from drilling wide area. Therefore, in this paper, to overcome these limitations, the mechanism of a compact excavating robot that mimics the anatomy and habit of digging animals is proposed. The proposed bio-inspired mechanism simulates the excavating and debris removing process of a ground-digging mole using its teeth and forelimbs. Finally, the stress generated by the module during excavation is analyzed and the design durability is verified through the simulation.