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Yeonho Kim,Jaesang Lee,Chihoon Jo,Yongha Kim,Minseok Song,Jonghyun Kim,Hyunsoo Kim IEEE 2011 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY Vol.60 No.5
<P>We developed an electric oil pump (EOP) and a control algorithm for automatic transmission (AT)-based two-shaft parallel hybrid electric vehicles (HEVs). The EOP capacity was designed based on AT oil pump test results, and the torque of the EOP motor was determined by considering the flow rate and efficiency calculated according to the operating temperature of the AT fluid. A control algorithm consisting of low, high, and middle speeds according to the HEV driving mode was proposed for the operation of the designed EOP. Control logic was proposed to reduce the EOP energy requirements in the middle-speed range, in which the EOP and AT oil pump operate together. We verified that this control method could reduce electric load while supplying the required hydraulic pressure.</P>
Terahertz transmission properties of silicon wafers using continuous-wave terahertz spectroscopy
Kim, Chihoon,Ahn, Jae Sung,Ji, Taeksoo,Eom, Joo Beom IOP 2017 Measurement Science and Technology Vol.28 No.4
<P>We present the spectral properties of Si wafers using continuous-wave terahertz (CW-THz) spectroscopy. By using a tunable laser source and a fixed distributed-feedback laser diode (DFB-LD), a stably tunable beat source for CW-THz spectroscopy system can be implemented. THz radiation is generated in the frequency range of 100 GHz–800 GHz by photomixing in a photoconductive antenna. We also measured CW-THz waveforms by changing the beat frequency and confirmed repeatability through repeated measurement. We calculated the peaks of the THz frequency by taking fast Fourier transforms (FFTs) of measured THz waveforms. The feasibility of CW-THz spectroscopy is demonstrated by the THz spectra of Si wafers with different resistivities, mobilities, and carrier concentrations. The results show that Si wafers with a lower resistivity absorb more THz waves. Thus, we expect our CW-THz system to have the advantage of being able to perform fast non-destructive analysis.</P>
Light field microscope target with low power, low pressure reactive ion etching process
Kim Chihoon,Kim Sang Yun,Lee Munseob 한국물리학회 2023 Current Applied Physics Vol.50 No.-
This study relates to the manufacturing process of 3-dimensional resolution target for light field microscope that can obtain 3-dimensional image information. Based on the optical specifications of the micro-lens array, 3- dimensional resolution target was designed to simultaneously measure resolution of lateral, axial and field of view. The width of each block gradually decreases from 24 μm, and 5 μm is the minimum width. These blocks are arranged in a square shape of 0.46 × 0.46 mm2. We also fabricated 3-dimensional resolution target based on reactive ion etching process with photolithography to produce silicon microstructure. To remove the recessed shape of the silicon etched corners and stepping of the sidewalls, we combined CF4 (66%), SF6 (16%) and O2 (16%) gases while maintaining low power (30 Watt) and pressure (15 mTorr) to obtain a smooth surface and distinct anisotropic etch characteristics. The fabricated samples showed uniform surface and height characteristics. Based on manufactured 3-dimensional target, a 3-dimensional perspective view image was shown using a light field microscope.
Determination of organic compounds in water using ultraviolet LED
Kim, Chihoon,Ji, Taeksoo,Eom, Joo Beom IOP Pub 2018 Measurement science & technology Vol.29 No.4
<P>This paper describes a method of detecting organic compounds in water using an ultraviolet LED (280 nm) spectroscopy system and a photodetector. The LED spectroscopy system showed a high correlation between the concentration of the prepared potassium hydrogen phthalate and that calculated by multiple linear regression, indicating an adjusted coefficient of determination ranging from 0.953–0.993. In addition, a comparison between the performance of the spectroscopy system and the total organic carbon analyzer indicated that the difference in concentration was small. Based on the close correlation between the spectroscopy and photodetector absorbance values, organic measurement with a photodetector could be configured for monitoring.</P>
자동변속기 기반 하이브리드 자동차의 하향변속중 회생제동 제어 알고리즘 개발
조치훈(Chihoon Jo),김정욱(Jungwook Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In this paper, regenerative braking algorithm is proposed during down-shift for a 6-speed 2-shaft parallel HEV, which satisfies the demanded braking force and driving comfort. First, down-shift strategy is suggested during the braking by considering the re-acceleration performance. To maintain a driving comfort regenerative braking algorithm is developed considering a response characteristic of the electronic hydraulic brake. Using the electronic hydraulic brake hardware and HEV simulator, HILS is performed. From HILS, it is found that regenerative braking algorithm satisfies the demanded braking force and the driving comfort to evaluate the control performance during down-shift
JoonShik Kim,WiHoon Jung,DoHyung Kang,JiYoung Park,JoonHwan Jang,JungSeok Choi,ChiHoon Choi,Jejoong Kim,JunSoo Kwon 대한신경정신의학회 2012 PSYCHIATRY INVESTIGATION Vol.9 No.3
Objective-The functional strategic mechanisms in the brain during performing visuospatial working memory tasks, especially tasks with heavy load, are controversial. We conducted the functional magnetic resonance imaging (fMRI) while sixteen subjects were performing face- and location-matching n-back tasks to examine causal relations within the frontoparietal networks. Methods-We applied a sophisticated method, the structural equation modeling (SEM), to the fMRI data. The imaging data were analyzed by extracting the task-related eigenseries using the principal component analysis (PCA) and then by applying a form of data-driven model called the automated search method. Results-The SEM analyses revealed a functional shift of network connectivity from the right to the left hemisphere with increasing load in the face-matching n-back tasks while the location-matching tasks required bilateral activation. In the locating matching n-back tasks, a pattern of parallel processing was observed in the left phonological loop and the right inferior parietal regions. Furthermore, object working memory-related activities in the left hemisphere reliably contributed to performance of both the face- and location-matching 2-back tasks. Conclusion-Our results are consistent with previous reports in terms of demonstrating parallel and distributed information processing during performing working memory tasks with heavy loads. Our results additionally suggest a dynamic shift between the fast imagery circuit (right hemisphere) and the stable verbal circuit (left hemisphere), depending on task load.