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..

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.

Effects of Thermal Annealing on In Situ Phosphorus-Doped Germanium <tex> $\hbox{n}^{+}/\hbox{p}$</tex> Junction

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>

Radiation Analysis of Communications and Broadcasting Satellite

Jaewoo Park,Taejin Chung,Seong-Pal Lee,Jongho Seon,Yun-Whang Jeong 한국항공우주학회 2002 International Journal of Aeronautical and Space Sc Vol.3 No.2

Sustainable nanoporous carbon for CO_2, CH_4, N₂, H₂ adsorption and CO₂/CH₄ and CO₂/N₂ separation

Park, Jaewoo,Attia, Nour F.,Jung, Minji,Lee, Myoung Eun,Lee, Kiyoung,Chung, Jaewoo,Oh, Hyunchul Elsevier 2018 ENERGY Vol.158 No.-

<P><B>Abstract</B></P> <P>The huge production of waste agricultural and biomass products has a negative impact on the environment, thus necessitating economic and environmental recycling of abundant bio-waste materials to useful materials. To recycle and convert bio-waste materials, a sustainable nanoporous carbon from bio-waste (peanut shell, gingko, and metasequoia leaves) is facilely synthesized via one-step carbonization. Carbonized samples contain a small quantity of metal and non-metal residues (including sulfur and phosphorus), resulting in naturally doped porous carbon. The porosity, morphology, and composition of the nanoporous carbons were investigated and compared with those of commercially available activated carbon. Pure component adsorption isotherms of CO<SUB>2</SUB>, CH<SUB>4</SUB>, and N<SUB>2</SUB> were also measured at 40 °C up to1 bar for all samples. These data were used to estimate the separation selectivity for CO<SUB>2</SUB>/CH<SUB>4</SUB> and CO<SUB>2</SUB>/N<SUB>2</SUB> 1:1 binary mixtures and pressures according to the ideal adsorbed solution theory (IAST) model. Carbonized gingko leaf had the lowest SSA and pore volume but the highest S and P contents, with the highest average selectivity of 506 and 54 for CO<SUB>2</SUB>/N<SUB>2</SUB> and CO<SUB>2</SUB>/CH<SUB>4,</SUB> respectively. This implies that the composition of the prepared carbon materials plays a significant role in their CO<SUB>2</SUB> adsorption and separation ability, rather than their textural properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sustainable microporous carbon from waste products was developed. </LI> <LI> Special elemental composition role of porous carbon was investigated. </LI> <LI> The developed porous carbon achieved 3.63 mmol/g of CO<SUB>2</SUB> at 1 bar and 40 °C. </LI> <LI> Enhanced CO<SUB>2</SUB>/N<SUB>2</SUB>(506) and CO<SUB>2</SUB>/CH<SUB>4</SUB>(54) selectivity was achieved. </LI> <LI> Synergetic effect between P and S elemental composition was noticed. </LI> </UL> </P>

A facile synthesis tool of nanoporous carbon for promising H₂, CO₂, and CH₄ sorption capacity and selective gas separation

Park, Jaewoo,Jung, Minji,Jang, Haenam,Lee, Kiyoung,Attia, Nour F.,Oh, Hyunchul The Royal Society of Chemistry 2018 Journal of materials chemistry. A, Materials for e Vol.6 No.45

<P>The commercialization of hydrogen as a clean source of energy is a vital requirement for overcoming the anticipated energy crisis. In addition, the capture of CO2 and commercialization of methane as an efficient and clean alternative to polluting gasoline are important goals. To this end, we have developed a nanoporous activated carbon material prepared from renewable resources that has a high storage capacity for various gases. Sugar beet leaves were converted to graphite flakes and decorated with polymer nanoparticles, giving rise to a highly porous activated carbon through chemical activation. The developed porous carbon has a high surface area (2800 m<SUP>2</SUP> g<SUP>−1</SUP>) and specific pore volume (1.86 cm<SUP>3</SUP> g<SUP>−1</SUP>), as well as high nitrogen and oxygen contents. The combination of high surface area, pore volume, and nitrogen and oxygen contents provided superior storage capacity for various gases. The total hydrogen storage capacities at 20 bar were 5.9 and 0.15 wt% at 77 and 298 K, respectively. In addition, the physical upper limit of hydrogen storage capacity was also evaluated using Brunauer-Emmett-Teller isotherms at the liquefaction temperature of hydrogen (20 K). A value of 14.1 wt% was obtained, which is the highest reported value for a porous carbon. The CO2 capture and CH4 storage capacities at room temperature and 20 bar were 19.65 and 7.6 mmol g<SUP>−1</SUP>, respectively, which are also among the highest values reported for porous carbon materials. Furthermore, the separation selectivity for CO2/CH4 binary mixtures was evaluated based on the ideal adsorbed solution theory (IAST) model and found to be 4.6.</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>

Dual-Size Silicon Nanocrystal-Embedded SiO_<i>x</i> Nanocomposite as a High-Capacity Lithium Storage Material

Park, Eunjun,Yoo, Hyundong,Lee, Jaewoo,Park, Min-Sik,Kim, Young-Jun,Kim, Hansu American Chemical Society 2015 ACS NANO Vol.9 No.7

<P>SiO<SUB><I>x</I></SUB>-based materials attracted a great deal of attention as high-capacity Li<SUP>+</SUP> storage materials for lithium-ion batteries due to their high reversible capacity and good cycle performance. However, these materials still suffer from low initial Coulombic efficiency as well as high production cost, which are associated with the complicated synthesis process. Here, we propose a dual-size Si nanocrystal-embedded SiO<SUB><I>x</I></SUB> nanocomposite as a high-capacity Li<SUP>+</SUP> storage material prepared <I>via</I> cost-effective sol–gel reaction of triethoxysilane with commercially available Si nanoparticles. In the proposed nanocomposite, dual-size Si nanocrystals are incorporated into the amorphous SiO<SUB><I>x</I></SUB> matrix, providing a high capacity (1914 mAh g<SUP>–1</SUP>) with a notably improved initial efficiency (73.6%) and stable cycle performance over 100 cycles. The highly robust electrochemical and mechanical properties of the dual-size Si nanocrystal-embedded SiO<SUB><I>x</I></SUB> nanocomposite presented here are mainly attributed to its peculiar nanoarchitecture. This study represents one of the most promising routes for advancing SiO<SUB><I>x</I></SUB>-based Li<SUP>+</SUP> storage materials for practical use.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-7/acsnano.5b03166/production/images/medium/nn-2015-03166n_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03166'>ACS Electronic Supporting Info</A></P>

Standardization Study of the Korean Version of the Stages of Change Readiness and Treatment Eagerness Scale for Smoking Cessation (K-SOCRATES-S) and Its Predictive Validity

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.

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>