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Chanho. Ko,Seungho. Han,Minseong. Choi,Kyung-Soo. Kim 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
This paper attempts to implement an integrated path planning and tracking controller that generates optimal control inputs guaranteeing a collision-free path. This integrated scheme is achieved by unifying model predictive control (MPC) with a potential field for assigning collision risk. The target vehicle is an electrified autonomous vehicle that is capable of directly controlling traction and braking torques of vehicle. Wheel torque and steering input of vehicle are optimized by receding horizon optimization (RHO) and give us stable and comfort reference trajectories. In the optimization process, control inputs, tracking errors, and collision risk are to be minimized in a single objective function. Collision risk is taken into account by modeling proper potential fields that allow the controller to re-plan the given desired path for avoiding a collision. Simulation is conducted using a high-fidelity vehicle plant model and the control scheme demonstrates promising results by verifying optimal and stable path guaranteeing collision-free.
Triboelectric nanogenerators with transfer-printed arrays of hierarchically dewetted microdroplets
Park, Chanho,Yu, Seunggun,Cho, Suk Man,Song, Giyoung,Lee, Yujeong,Kang, Han Sol,Lee, Seung Won,Eoh, Hongkyu,Park, Cheolmin Elsevier 2018 Nano energy Vol.51 No.-
<P><B>Abstract</B></P> <P>Triboelectric nanogenerators (TENG) is of great interest as an emerging power harvester due to its simple device architecture and high efficiency. Despite development of various surface modification techniques for enhancing the performance of a TENG with a given triboelectric pair of materials, a method capable of being used universally on a variety of surfaces and improving the performance of TENGs with diverse surfaces remains a challenge. Here, we demonstrate a novel transfer-printing technique of hierarchically dewetted polymer droplets on various TENG surfaces for performance enhancement of the TENGs. Our method is based on controlled dewetting of a thin supramolecular assembled film of two end-functionalized polymer blends on a prepatterned poly(dimethyl siloxane) mold, followed by the physical pattern-transfer of arrays of the dewetted droplets consisting of supramolecular assembled nanostructures on a TENG contact surface. The hierarchically dewetted microdroplets comprising soft-etched nanopores efficiently improve the performance of a TENG by more than three times compared to one without the transferred pattern. The pattern-transfer is successfully achieved on various surfaces including not only oxides, plastics, rubbers, and metals, but also fabrics, coins, vegetables, and shells, making our approach a convenient way for enhancing the triboelectric performance of a given TENG.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Transfer printing was used as a versatile tool to enhance contact area of a TENG. </LI> <LI> The performance of a TENG was improved by more than three times with the pattern. </LI> <LI> A variety of surfaces were suitable, including oxides, plastics, rubbers, and metals. </LI> <LI> Transfer printing well occurred on stretchable, bendable, and roughened substrates. </LI> <LI> The printing offers opportunities for broadening the choice of materials for TENGs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
유찬호(Yoo Chanho),한연진(Han Yeonjin),강수용(Kang Sooyoung),백승철(Baek Seungcheol) 한국지반환경공학회 2012 한국지반환경공학회논문집 Vol.13 No.3
연약지반 개량공법에 있어서 대부분의 수평 배수층은 모래나 쇄석 등의 골재를 이용하고 있으나, 이러한 골재를 수평 배수층으로 사용하는 경우에는 종종 원지반의 침하불량을 유발하는 경우가 발생하고 있다. 이에 수평 배수층을 깔지 않고 수평 배수용 파이프를 이용하는 수평배수관망 시스템이 개발되어 적용되고 있다. 이러한 공법은 반복 성토과정으로 발생하는 과잉 간극수압을 수평 배수관망으로 직접 배수하는 시스템이다. 본 연구에서는 수평배수관망 시스템의 적용성과 시공성을 확인하고자 실 규모 현장시험 시공을 수행하여 수평배수관망 시스템의 적용성을 평가하였다. 현장시험시공을 통하여 수평 배수관망 시스템의 침하 거동특성을 살펴보았으며, 또한 수평배수관망 변형정도를 확인하여 일반적인 수평배수층을 이용하는 공법과 비교분석하여 그 효용성을 확인하였다. The most of horizontal drainages, which is composed of the aggregates made of sand and crushed stone, are used to improve the soft ground. However, where the aggregates are used as the horizontal drainage, it often brings about the delay of consolidation. For this reason, the horizontal drain pipe system is applied to properly improve the soft ground using a drainage pipe instead of horizontal drainage. This system is direct drain method for disappearing the excess porewater pressure which is caused by placing of fill on the soft ground. The large-scale field test was conducted in order to evaluate the applicability and constructability of the horizontal drain pipe system. The settlement characteristics of improved ground with horizontal drain pipe system was observed. It is also compared to the conventional soft ground improvement method to confirm its effectiveness.
과학 탐구의 본성에 대한 명시적-반성적 탐구 학습 프로그램의 영향
한수진,양찬호,노태희,Han, Sujin,Yang, Chanho,Noh, Taehee 대한화학회 2013 대한화학회지 Vol.57 No.1
In this study, we developed a explicit and reflective scientific inquiry learning program about nature of scientific inquiry, and compared its instructional influences with those of implicit scientific inquiry learning. We also compared students' perceptions of the program. Eighth graders at a middle school were assigned to the treatment and the control groups. The students of the treatment group participated in the program, while those of the control group participated in general scientific inquiry instruction. The analyses of the results revealed that the program was more effective in improving students' epistemological views on scientific inquiry than general scientific inquiry learning. However, there were no statistically significant differences in both test scores of science achievement and enjoyment of science lessons. The students of the treatment group perceived that group discussion on the nature of scientific inquiry was an advantage of the program. However, they still had difficulties in performing group discussion, understanding the nature of scientific inquiry, and writing and presenting their thoughts. Educational implications of these findings are discussed. 이 연구에서는 과학 탐구의 본성에 대한 명시적-반성적 탐구 학습 프로그램을 개발하고 적용하여 그 효과를 과학 탐구의 본성을 직접 가르치지 않은 암시적 탐구 수업과 비교하였다. 또한, 개발된 프로그램 및 암시적 탐구 수업에 대한 학생들의 인식을 비교하였다. 중학교 2학년 학생들을 두 집단에 배치하였다. 처치 집단에서는 과학 탐구의 본성에 대한 명시적-반성적 탐구 학습 프로그램을 실시하였고, 통제 집단에서는 과학 탐구의 본성과 관련된 내용을 제외하고 처치 집단과 동일한 탐구 활동을 사용한 수업을 실시하였다. 연구 결과, 처치 집단의 수업이 학생들의 과학 탐구에 대한 인식론적 견해를 향상시키는데 효과적이었다. 그러나 두 집단의 과학 성취도와 과학 수업에 대한 즐거움에는 통계적으로 유의미한 차이가 없었다. 처치 집단의 학생들은 과학 탐구의 본성에 대한 소집단 토론 활동을 수업의 장점으로 생각하였으며, 소집단 토론 활동이나 과학 탐구의 본성에 대한 이해, 자신의 생각을 글로 쓰고 발표하는 활동 등을 어려움으로 인식하는 것으로 나타났다. 이에 대한 교육학적 함의를 논의하였다.
Seokho Suh,Sunghoon Han,Hocheol Yoon,Hyunsu Kim,Jisue Kang,Chanho Pak,Hyeong-Jin Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
SiO 2 -based anodes have attracted extensive attention due to their high theoretical capacity of 1,956 mAh g -1 , stable cycle life, and abundance on Earth. However, their commercialization is still hindered by several intrinsic problems, such as poor electrical conductivity and electrochemical inactiveness. In this study, a 3-dimensional SiO 2 /C electrode is fabricated by introducing a pore-forming agent (polytetrafluoroethylene, PTFE) and partially carbonizing a polyvinylidene fluoride (PVDF) binder. During heat treatment at 600 °C, PTFE powders are unzipped to develop microsized pores. Meanwhile, the PVDF binder is partially carbonized to form highly conductive F-doped graphitic carbon. In particular, a highly porous platelet SBA-15 template is used as an SiO 2 active material for large contact areas between SiO 2 and carbonized PVDF. As a result, the structured SiO 2 /C anode exhibits better cycle performance and internal resistance than typical SiO 2 electrodes: the structured SiO2/C anode delivers 294 mAh g -1 , while the typical SiO 2 anode is electrochemically inactive with Li + ions.
최영삼(Youngsam Choi),신창호(Chanho Shin),정진태(Jintai Chung),한송수(Songsoo Han),이상헌(Sangheon Lee),이계영(Kyeyoung Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this study, the performance of the DPRMs is evaluated and the measurement precision for the pile driving is presented. The DPRMs is a visual-measurement system for the pile rebound and the penetration movement using a high speed line-scan camera. But the measurement errors of the DPRMs are caused by the strong impact for the pile driving. Therefore, the DPRMs should guarantee its measurement values for the pile driving. For this reason, the performance of the DPRMs by the vibration signal analysis is studied. It is found from this study that the measurement values of the DPRMs are reliable.