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통합로직 개발환경 구축을 통한 전자제어식 주차 브레이크 시스템 개발
전재우(Jaewoo Jeon),정하민(Hamin Jung),박인욱(Inuk Park),박창훈(Changhoon Park),천재승(Jaeseung Chun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The main classification of Electric Parking Brakes (EPB) can be made into cable puller and caliper integrated types. In this paper, the main design considerations that need to be made for each type of system will be examined. In terms of software, a unified software structure that can incorporate both types of EPBs will be introduced. This unified approach, made up of fixed and variable modules, allows for more efficient software development for both types of EPB systems. The fixed modules are related to the identical target functions regardless of EPB type, while the variable modules are made up of the different considerations that need to be made depending on the EPB type in order to meet such targets. Finally, some test results of target functions for both types of EPB systems will be given..
Park, Min,Lee, Hyeseong,Jang, Ji-un,Park, Jong Hyuk,Kim, Chai Hwan,Kim, Seong Yun,Kim, Jaewoo Elsevier Applied Science Publishers 2019 Composites science and technology Vol.177 No.-
<P><B>Abstract</B></P> <P>Techniques for optimizing the dispersion of carbon nanotubes in composites by applying small amounts of additives in a simple manner are recognized as one of the most important core technologies in nanocomposite engineering. In this study, we reported the feasibility of phenyl glycidyl ether (PGE) as an effective noncovalent functionalization agent and suggested a facile and low-temperature process that applied high-speed rotation based on a planetary centrifugal mixer to improve the dispersion of multiwalled carbon nanotube (MWCNT) in the polyamide 6 (PA6) composite. PGE molecules were introduced on MWCNTs based on the π-π* interaction, resulting in enhanced MWCNT dispersion by preventing of the aggregation between the MWCNTs due to the van der Waals force. The tensile strength of the PA6 composite fiber filled with 1 wt% MWCNTs was improved up to 31.8% by the PGE treatment, indicating that PGE molecules were an effective noncovalent functionalization agent.</P>
JaeWoo Park,KeeHwan Park,KeunHo Joe,SookHee Choi,InJae Lee,JuHee Hwang,Min Kwon,ShengMin Wang,DaiJin Kim 대한신경정신의학회 2012 PSYCHIATRY INVESTIGATION Vol.9 No.3
Objective-The purpose of the study was to develop the Korean version of the Stage of Change Readiness and Treatment Eagerness Scale for Smoking Cessation (K-SOCRATES-S) based on the Korean version of the Stages of Readiness for Change and Eagerness for Treatment scale (K-SOCRATES). This paper also demonstrates its reliability and validity among patients with nicotine dependence in South Korea. Methods-At seven healthcare promotion centers in Gyeonggi-do, 333 male smokers aged 20 to 70 who visited smoking cessation clinic were recruited for this study and the K-SOCRATES-S was administered. After three months, the number of respondents who successfully stopped smoking was assessed by testing their urine cotinine level. Subsequently, exploratory factor analysis was performed to verify the reliability and validity of the K-SOCRATES-S. Also, a logistic regression analysis was performed to examine the variables that can predict the successful cessation of smoking on subscales of the K-SOCRATES-S. Results-Exploratory factor analysis of the K-SOCRATES-S showed that the scale consisted of three factors: Taking Steps, Recognition, and Ambivalence. The scales measuring Taking Steps and Recognition in this scale had a significantly positive correlation with the scores observed on Kim’s smoking cessation motivation scale. The scales measuring Taking Steps and Recognition had a significantly negative correlation with Ambivalence. Overall, the results indicate that the K-SOCRATES-K scale showed high validity. Conclusion-The K-SOCRATES-S developed in the present study is highly reliable and valid for predicting a patient’s likelihood of success in quitting smoking among patients who want to cease smoking.
User Intention Based Intuitive Mobile Platform Control: Application to a Patient Transfer Robot
Jaewoo Park,Bohyun An,Ohwon Kwon,Hak Yi,Changwon Kim 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.6
This study proposes a user’s intuitive intention-based control system for mobile robot platforms. As an application of the control scheme, we focused on a robot that transports patients in medical facilities. However, since most of the people who operate the patient transfer robot (PTR) are not robotics experts, an intuitive control method is needed to enable easy operation of the robot system. Also minimizing the discomfort experienced by the patient in the process of transferring the patient through the patient transfer robot is another important issue to consider. Therefore, the main contributions of this are developing an intuitive user interface and proposing a sway reduction control scheme. To accomplish the first issue, the intuitive control is implemented by proposing a robot control interface, where four force-sensing resistor (FSR) sensors are installed on a robot’s handle (where a user holds a robot). Through this, the robot can be easily moved with only a simple and intuitive operation of the user. Therefore forward, backward, left movement, right movement, left turn, and right turn operation can be controlled through the intuitive movement of the user input through the developed user interface. Additionally, in order to satisfy the second requirement, the patient’s sway reduction strategy is suggested by applying fuzzy logic-based control command generation method to the user intention. Through this method, the sway that occurs during the movement of the robot is reduced. In this study, the mecanum wheel was applied to the driving platform of the patient transfer robot to enable omnidirectional movement. The performance of the proposed control method is verified through simulations and experiments. Simulation and experimental results confirm that the proposed method reduced the acceleration and jerk root mean square values of the robot compared to a comparison method.
A Direct-Conversion CMOS RF Receiver Reconfigurable From 2 to 6 GHz
Jaewoo Park,Shin-Nyoung Kim,Yong-Seong Roh,Changsik Yoo IEEE 2010 IEEE transactions on microwave theory and techniqu Vol.58 No.9
<P>A CMOS direct-conversion receiver with only one signal path is reconfigurable from 2 to 6 GHz in the RF band and from 3.6 to 54 MHz in the channel bandwidth. By employing a voltage feedback in a common-gate low-noise amplifier (LNA), the input matching of the LNA can be reconfigured for each RF band by simply changing the resonant frequency of the load network. The frequency characteristics of the active-RC channel selection filter with an R-2R ladder is automatically tuned by a one-shot tuning circuit. Implemented in 0.18- μm RF CMOS technology, the whole receive path shows 4.6-5.6-dB noise figure while consuming 65-75 mA from a 1.8-V supply depending on the mode of operation.</P>
Theoretical and Experimental Investigation of Graphene/High- <tex> $\kappa $</tex>/p-Si Junctions
Jaewoo Shim,Gwangwe Yoo,Dong-Ho Kang,Woo-Shik Jung,Young-Chul Byun,Hyoungsub Kim,Won Tae Kang,Woo Jong Yu,Hyun-Yong Yu,Yongkook Park,Jin-Hong Park IEEE 2016 IEEE electron device letters Vol.37 No.1
<P>Here, we theoretically and experimentally investigate the impact of a high-kappa layer inserted between graphene and p-Si in a graphene/Si junction. We have achieved 86-fold and 222-fold reductions in a specific contact resistivity (rho(c)) by inserting 1-nm-thick Al2O3 and 2-nm-thick TiO2 in the graphene-semiconductor junction, respectively, corresponding to lowering the effective barrier height by 0.24 and 0.12 eV. Furthermore, we propose a graphene-induced gap state model that simultaneously considers the graphene's modulation by a gate bias and the effect of the high-kappa insertion.</P>
Jaewoo Shim,Song, I.,Jung, W.-S,Nam, J.,Leem, J. W.,Yu, J. S.,Kim, D. E.,Cho, W. J.,Kim, Y. S.,Jun, D.-H,Heo, J.,Park, W.,Jin-Hong Park,Saraswat, K. C. IEEE 2013 IEEE electron device letters Vol.34 No.1
<P>In this letter, we investigate the electrical behavior of vacancy <I>V</I><SUB>Ge</SUB> defects in Ge at various thermal annealing conditions through electrochemical capacitance-voltage analysis. Then, the effects of the annealing process on Ge n<SUP>+</SUP>/p junction diodes were also studied with <I>J</I>-<I>V</I>, transmission electron microscopy, and secondary ion mass spectroscopy measurements in the aspects of point-defect healing and dopant diffusion/loss phenomena. The <I>V</I><SUB>Ge</SUB> defects tend to heal by recombining with Ge interstitial atoms as the annealing process temperature increases. However, the diffusion/loss problems of P atoms in Ge become severe at above 500<SUP>°</SUP>C. Therefore, an optimal postfabrication annealing process at 600<SUP>°</SUP>C is proposed in terms of point-defect healing and dopant diffusion/loss reduction.</P>
Park, Jun-Young,Jo, Su-Kyung,Park, Kyung-Min,Yu, Hyunjong,Bai, Jaewoo,Ryu, Sangryeol,Chang, Pahn-Shick Elsevier 2019 Food control Vol.96 No.-
<P><B>Abstract</B></P> <P>Erythorbyl laurate (EL) is a novel multi-functional emulsifier with antibacterial activity against Gram-positive bacteria. The objective of this study was to find genetic evidences of the antibacterial mechanism of EL against food-borne pathogenic <I>Staphylococcus aureus</I> Newman by transcriptomic analysis. Total RNA samples were extracted from non-treated and 0.1 mM (sublethal concentration) EL-treated <I>S. aureus</I> Newman, and then transcriptional profiling was performed by RNA sequencing (RNA-Seq). In EL-treated <I>S. aureus</I> Newman, 242 and 225 genes out of the 2687 genes, were up-regulated and down-regulated greater than 2-fold change, respectively. The majority of up-regulated genes in EL-treated <I>S. aureus</I> Newman were cell wall stress stimulon including genes related to VraSR two-component regulatory system (<I>vra</I>S, <I>vra</I>R, and <I>vra</I>T), cell envelopment (<I>mur</I>, <I>sgt</I>, <I>fmt</I>, and etc.) and L-lysine biosynthesis (<I>lys</I>, <I>dap</I>, and etc.), and there were significant differences in the regulation of peptidoglycan biosynthesis between EL-treated and control samples (<I>p</I> < 0.01). On the other hand, genes involved in energy metabolism, nucleic acid metabolism, translation, cell division, and transporter were down-regulated. Finally, these results of the transcriptional profiling from RNA-Seq were validated by quantitative real-time PCR. This transcriptomic study could provide the genetic evidence of the EL stress response, which suggests that EL act as a cell wall-active (cell membrane targeting) agent.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>S. aureus</I> Newman treated with 0.1 mM EL was analyzed by RNA sequencing. </LI> <LI> A total of 467 genes were differentially expressed in EL-treated <I>S. aureus</I> Newman. </LI> <LI> Genes related to cell wall stress stimulon (<I>e.g. vra</I>SR) were up-regulated. </LI> <LI> Genes related to cell growth (<I>e.g.</I> metabolism and translation) were down-regulated. </LI> <LI> EL was proposed as a cell wall-active (cell membrane targeting) agent. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>