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전재한(Jaehan Jeon),최아라(Ara Choi),박성훈(Sunghoon Park),정태영(Taeyoung Chung) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
As an autonomous driving technology is the future of on-road driving, an unmanned valet parking system is one of a key technology to realize door to door autonomous vehicle. When an autonomous vehicle arrive its destination, the driver steps out of the car and pushes button on the smart phone, and then the vehicle autonomously parking in without any anxiety of user. Similarly, the vehicle gets out from the parking lot at right time and right position for user. We mainly focused on a vehicle actuator control, path following control for parking slot detection, parking maneuver control with shift-by-wire system, and smart phone interface between the user and vehicle. As the localization technology of a vehicle at the indoor or outdoor parking areas is most important and difficult problem, we applied precise position information from the DGPS for preliminary implementation of the system.
Sound visualization of smartphone-radiated noise using nearfield acoustic holography
Taeyoung Park,Seonghun Im,Dong-Hyun Kim,Sangbeom Woo,Inman Jang,Won-Suk Ohm,Heungkil Park,Sehun Park,Guwon Ji 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
A smartphone contains electronic components that can inadvertently act as sources of unwanted vibration and noise. Also known as the "buzz," the noise is produced primarily by multilayer ceramic capacitors, the piezoelectric pulsation of which drives the circuit board into vibration, hence sound radiation. Given the close proximity of the smartphone to the ear, the audible noise, albeit low in amplitude, can be a nuisance and degrade the call quality. Thus accurate measurement and analysis of the noise are needed as the first step toward resolving the problem. The popular farfield-based techniques, however, are not applicable to smartphone-radiated noise because of its low sound pressure level (~20 dB). This paper presents an alternative method based on nearfield acoustic holography (NAH), here tailored for a small mobile device radiating low-intensity noise. The NAH method is shown to be capable of visualizing sound pressure and intensity anywhere near the smartphone as well as the vibration of the circuit board, which could lead to an effective design strategy for a quieter smartphone.
Bayesian Semi-Parametric Regression for Quantile Residual Lifetime
Park, Taeyoung,Bae, Wonho The Korean Statistical Society 2014 Communications for statistical applications and me Vol.21 No.4
The quantile residual life function has been effectively used to interpret results from the analysis of the proportional hazards model for censored survival data; however, the quantile residual life function is not always estimable with currently available semi-parametric regression methods in the presence of heavy censoring. A parametric regression approach may circumvent the difficulty of heavy censoring, but parametric assumptions on a baseline hazard function can cause a potential bias. This article proposes a Bayesian semi-parametric regression approach for inference on an unknown baseline hazard function while adjusting for available covariates. We consider a model-based approach but the proposed method does not suffer from strong parametric assumptions, enjoying a closed-form specification of the parametric regression approach without sacrificing the flexibility of the semi-parametric regression approach. The proposed method is applied to simulated data and heavily censored survival data to estimate various quantile residual lifetimes and adjust for important prognostic factors.
Scalable fabrication of nanopores in membranes <i>via</i> thermal annealing of Au nanoparticles
Park, Taeyoung,Lee, Sang Jun,Cha, Jong Hwan,Choi, Wonjoon Royal Society of Chemistry 2018 Nanoscale Vol.10 No.47
<P>Nanopores are promising candidates for versatile sensing of micro- and nanomaterials. However, the fabrication of isolated nanopores with optimal dimensions and distributions requires complex processes that involve the use of high-cost equipment. Herein, we report a scalable fabrication of isolated conical nanopores with adjustable dimensions and distribution densities on a Si3N4 membrane <I>via</I> thermal annealing of Au nanoparticles (AuNPs). The AuNP-dispersed solution was dropped and evaporated on the membrane, while the pH value and concentration of AuNPs controlled the zeta potential difference and the distribution density of the attached AuNPs. The optimized thermal annealing directly fabricated conical nanopores at the positions of the AuNPs because of the quasi-liquid state of the AuNPs and their interaction with the Si3N4 lattices. The 50, 100, and 200 nm AuNPs enabled one-step fabrication of 8-, 26-, and 63 nm nanopores, while the inter-distances and distribution densities were controllable over the membrane. The physicochemical analyses elucidated the underlying mechanisms of direct nanopore formation, and the precise adjustment of thermal annealing developed three unique nanopores that differently interacted with the AuNPs: (1) Au-residue-embedded nanopores, (2) isolated nanopores, and (3) nanopores with the remaining Au droplet. The AuNPs-driven fabrication of versatile nanopore membranes enables new applications for sensing and transporting small-scale materials.</P>
On the Strong and Weak Compact Spaces
Park,TaeYoung,Koh,Hyung Joo 中央大學校 基礎科學硏究所 1990 基礎科學硏究所 論文集 Vol.4 No.-
본 논문에서는 콰시 에이취-크로우즈드 공간(quasi H-colsed space)과 에스-크로우즈드 공간(S-closed space)의 중간적인 피브리-컴펙트 공간(feebly-compact space)이라는 새로운 컴펙트 공간을 소개하였다. 피브리-컴펙트 공간과 여러 다른 컴펙트 공간들과의 관계성을 연구했고, 또한 피브리 컴펙트 공간과 그것의 개부분집합(open subset)의 부분공간(subspace)과의 성질 및 관계성을 버였으며, f : X→Y가 나-연속함수(na-continuous function)라고 할 때, X가 콰시 에이취-크로우즈드 공간이면 Y가 피브리-컴펙트 공간이 됨을 증명하였다.
Trends in Leopard Cat (Prionailurus bengalensis) Research through Co-word Analysis
Park, Heebok,Lim, Anya,Choi, Taeyoung,Han, Changwook,Park, Yungchul Institute of Forest Science 2018 Journal of Forest Science Vol.34 No.1
This study aims to explore the knowledge structure of the leopard cat (Prionailurus bengalensis) research during the period of 1952-2017. Data was collected from Google Scholar and Research Information Service System (RISS), and a total of 482 author keywords from 125 papers from peer-reviewed scholarly journals were retrieved. Co-word analysis was applied to examine patterns and trends in the leopard cat research by measuring the association strengths of the author keywords along with the descriptive analysis of the keywords. The result shows that the most commonly used keywords in leopard cat research were Felidae, Iriomte cat, and camera trap except for its English and scientific name, and camera traps became a frequent keyword since 2005. Co-word analysis also reveals that leopard cat research has been actively conducted in Southeast Asia in conjugation with studying other carnivores using the camera traps. Through the understanding of the patterns and trends, the finding of this study could provide an opportunity for the exploration of neglected areas in the leopard cat research and conservation.
Plasma information-based virtual metrology (PI-VM) and mass production process control
Park Seolhye,Seong Jaegu,장윤창,Roh Hyun-Joon,권지원,Lee Jinyoung,Ryu Sangwon,송재민,Roh Ki-Baek,Noh Yeongil,Park Yoona,Jang Yongsuk,Cho Taeyoung,Yang Jae-Ho,김곤호 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.8
In this paper, we review the development of plasma engineering technology that improves dramatically the production efficiency of OLED (organic light-emitting diode) displays and semiconductor manufacturing by utilizing a process monitoring methodology based on the physical domain knowledge. The domain knowledge consists of plasma-heating and sheath physics, plasma chemistry and plasma-material surface reaction kinetics, and plasma diagnostics. Based on this, a plasma information-based virtual metrology (PI-VM) algorithm was developed drastically enhanced process prediction performance by parameterizing plasma information (PI) which can trace the states of processing plasmas. PI-VM has superior process prediction accuracy compared to the classical statistics-based virtual metrologies. The developed PI-VM algorithms adopted for practical processing issues such as the control and management of the OLED-display mass production demonstrated savings of approximately 25% of the yield loss over the past 5 years. This improvement was achieved with the development of FDC (fault detection and classification) and APC (advanced process control) logic, which can be developed through the analysis of the physical characteristics of the feature parameters used in PI-VM with the evaluation of their contributions and their correlations to the processing results. PI-VM provides leverage that can be applied in the development of process equipment and factory automation technologies.