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Development of a Low-Cost Steering System Simulator
You- Yub Lee,Yong-Goo Joe,Jae-Eung Oh,Chang-Su Hahn,Ki-hong Shin 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.9
The Steering system is the most important system for a vehicle, in terms of safety and driving feel. But in many cases, experiments to improve the steering feel using a real vehicle are very<br/> difficult in the aspects of repeatability. safety and money. Repeatability in testing steering systems is very important because the steering feel for a driver varies according to the environmental conditions. In addition to that. steering tests using vehicle are so dangerous that the driver might not concentrate on the tests. In this paper. a new steering system simulator using the front part of a steering and suspension system is described. This simulator allows cheap, safe, and repeatable testing of the steering system compared with the real vehicle test.
Development of a Low-Cost Steering System Simulator
Lee, You-Yub,Joe, Yong-Goo,Oh, Jae-Eung,Hahn, Chang-Su,Shin, Ki-hong The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.9
The Steering system is the most important system for a vehicle, in terms of safety and driving feel. But in many cases, experiments to improve the steering feel using a real vehicle are very difficult in the aspects of repeatability, safety and money. Repeatability in testing steering systems is very important because the steering feel for a driver varies according to the environmental conditions. In addition to that, steering tests using vehicle are so dangerous that the driver might not concentrate on the tests. In this paper, a new steering system simulator using the front part of a steering and suspension system is described. This simulator allows cheap, safe, and repeatable testing of the steering system compared with the real vehicle test.
이유엽(Lee, You-Yub),박상길(Park, Sang-Gil),오재응(Oh, Jae-Eung) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.3
This study presents the active noise control of duct noise. The duct was excited by a steady-state harmonic and white noise force and the control was performed by one control speaker attached to surface of the duct. An adaptive controller based on filtered x LMS(FXLMS) algorithm was used and controller was defined by minimizing the square of the response of the error microphone. The assemble controller, which is called a hybrid ANC(active noise control) system, was combined with feedforward and feedback controller. The feedforward ANC attenuates primary noise that is correlated with the reference signal, while the feedback ANC cancels the narrowband components of the primary noise that are not observed by the reference sensor. Furthermore, in many ANC applications, the periodic components of noise are the most intense and the feedback ANC system has the effect of reducing the spectral peaks of the primary noise, thus easing the burden of the feedforward ANC filter.
전달특성을 이용한 소음원 규명과 입력요소 변경에 의한 실내소음 저감
이유엽(Lee, You-Yub) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.12
The structure has several types of noise and booming noise of a vehicle is usually caused by the vibration of the vehicle's body transmitted from the engine through the mounting system. Vector synthesis analysis is performed to predict the booming noise when the characteristic of the engine mounting system is changed., i.e., when magnitudes and phases of vibratory forces after the mounts are altered. To use this method effectively, the concept of Multi-dimensional-analysis and Experimental Design are introduced to identify the contributions of each vibration sources and transmission paths to interior noise. It was used 3inputs/1output system and found the magnitudes and phases of the forces for minimizing the noise. Finally, the synthesized interior booming noise level is predicted by the vector synthesis diagram. It is shown that the vector synthesis method can be used to obtain the optimum design characteristic of the mounting system to control the interior booming noise of a vehicle.
다차원 스펙트럼 해석법을 이용한 차실내 운전자석 진동전달경로 규명에 관한 연구
이유엽(Lee, You-Yub),박상길(Park, Sang-Gil),오재응(Oh, Jae-Eung) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.8
In this study, transfer path identification and output estimation are simulated by multi-dimension spectral analysis method (MDSA). Multi -input/single-output system give expression the vehicle suspension which each inputs are correlated reciprocally. In case of correlating with inputs, the system needs separating the each input signal by MDSA. Main simulations are about finding effective input by coherent output spectrum and selecting optimal input's number by multiple coherence function. Also, by shielding transfer path of each input, transfer path characteristic is identified in terms of overall integrated contribution level.
You, Young-Jun,Kim, Yongjin,Cheun, Hyeunseok,Shin, Changhwan,Kim, Do Young,Lee, Jae Hak,Song, Joon Yub,Lee, Jae Woo,Lee, Sae Youn,Ju, Byeong-Kwon,Shim, Jae Won IOP 2019 Nanotechnology Vol.30 No.26
<P>Herein, we introduce an interdigitated horizontal electrode (IHE) structure with a metal-based electron-collecting (or -injecting) electrode and a hole-collecting (or -injecting) electrode composed of a conductive polymeric material that has a nanoscale distance and is horizontally separated. In the IHE, a metal electrode is fabricated on a silicon-oxide substrate, and a self-assembled monolayer (SAM) is selectively bonded to the metal and the oxide to form a conductive polymer electrode by dip coating. Each of the SAM materials is composed of a head part bonded to the substrate surface and a tail part that is hydrophilic or hydrophobic. This inherent property makes the metal electrode hydrophobic and the oxide substrate hydrophilic. Ag is used as a metal electrode material and is combined with alkanethiol SAMs. The alkylsilane SAMs are combined with the silicon oxide substrate to make them hydrophilic, using poly (3, 4-ethylenedioxythiophene)-poly (PEDOT: PSS) as the conductive polymer material. In this study, we have found that there is a difference in the spacing between the two electrodes that depends on the combination of SAM materials. Each interval was spaced from a minimum of 140 nm to a maximum of 385 nm.</P>
You, Changkook,Lee, Moon-Hwan,Lee, Hyo-Jin,Han, Myung-Ho,Kwon, Tae-Yub,Kim, Kyo-Han,Oh, Daniel S. Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.4
<P><B>Abstract</B></P> <P>Cellular responses such as adhesion, spreading, growth and proliferation can be altered by macro and micro pores as well as surface patterns on its surface. In this study, the scaffold was prepared with interconnected macro pores by the polymeric sponge method and with interconnected micro pores by BCP slurry coating with different particle sizes on sintered porous body and necking sintering process. Two particle sizes for micro pores, 200–400nm and 600–800nm, were coated on a pre-sintered porous body. A combined macro and micro pore structure of the BCP scaffold can improve osteoblast cellular activity. <I>In vitro</I> study of MG63 cells suggest that the modified scaffolds improved cell response such as cell spreading, proliferation and differentiation. The scaffold that has a uniform distribution of micro pores ranging 1~5µm in diameter on its surface yields the highest rate of cellular response.</P>
P146 Factors associated with severity of alopecia areata
( Hye Rin You ),( Sang Yub Kim ),( Sook Jung Yun ),( Jee-bum Lee ),( Seong Jin Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2
<div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div> Background: Alopecia areata is the most common cause of localized, nonscarring alopecia. Unfortunately, there are few data regarding clinical features and epidemiology of alopecia areata in Korean patients. Objectives: This study strived to investigate the differences in clinical profiles according to disease severity and to determine risk factors for severe alopecia areata. Methods: A total of 1137 patients from 2006 to 2015 were analyzed retrospectively. Patients were subdivided into two groups: mild-to-moderate and severe alopecia areata. The groups were compared on the basis of age of onset, duration, sex, family history, comorbid disorders including autoimmune diseases, nail changes, and laboratory test results. Results: 883 patients were in the mild-to-moderate alopecia areata group and 254 patients were in the severe group. Average onset age was 30.77±17.66 years and 30.60±16.75 years in the mild-to-moderate and severe groups, respectively. Disease duration was statistically longer in the severe group. Male sex, nail changes, and thyroid diseases were more common in the severe group. Hypertension, diabetes mellitus, dyslipidemia, atopic dermatitis, and family history did not differ between groups. Of the serologic values, only alkaline phosphatase was considerably differing between groups. Male sex, presence of nail changes, and disease duration greater than one year were identified as significant ri Conclusion: This is the largest case analysis in Korean patients with alopecia areata
갑상선 수술의 수술 중 신경모니터링의 적용에 관한 최신지견
유지영 ( Ji Young You ),김훈엽 ( Hoon Yub Kim ) 대한갑상선학회 2021 International Journal of Thyroidology Vol.14 No.1
Intraoperative neuromonitoring is a well-established method used to prevent intraoperative nerve damage, and many studies have been performed in thyroid surgery. We introduced the basic concept and practical application of intraoperative neuromonitoring, as well as its standardized techniques and detailed contents. In addition, the contents of this still yet relatively unknown field, such as its application in transoral robotic thyroidectomy and its application to the external branches of the superior laryngeal nerve, were summarized by referring to many previous studies.