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Yu, Eui-Sang,Lee, Sin-Hyung,Bae, Young-Gyu,Choi, Jaebin,Lee, Donggeun,Kim, Chulki,Lee, Taikjin,Lee, Seung-Yeol,Lee, Sin-Doo,Ryu, Yong-Sang American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.44
<P>A liquid-permeable concept in a metal-insulator-metal (MIM) structure is proposed to achieve highly sensitive color-tuning property through the change of the effective refractive index of the dielectric insulator layer. A semicontinuous top metal film with nanoapertures, adopted as a transreflective layer for MIM resonator, allows to tailor the nanomorphology of a dielectric layer through selective etching of the underneath insulator layer, resulting in nanopillars and hollow voids in the insulator layer. By allowing outer mediums to enter into the hollow voids of the dielectric layer, such liquid-permeable MIM architecture enables to achieve the wavelength shift as large as 323.5 nm/RIU in the visible range, which is the largest wavelength shift reported so far. Our liquid-permeable approaches indeed provide dramatic color tunablility, a real-time sensing scheme, long-term durability, and reproducibility in a simple and scalable manner.</P> [FIG OMISSION]</BR>
Real Time Adaptive Step Length Estimation for Smartphone User
Jung Ho Lee,Beomju Shin,Chulki Kim,Jaehun Kim,Seok Lee,Taikjin Lee 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
An indoor positioning with a high accuracy is still a challenging research area. The error of pedestrian dead reckoning (PDR) is usually caused from both heading and step length error. In this paper, we focus on the reducing of step length estimation. We apply a linear combination consisted of 4 parameters obtained from an acceleration, an angular velocity, and a pedestrian average step length. For an in-flight calibration of step length estimation, we utilize map information and calculate constants for linear combination. We conduct a field test and its result suggests that the proposed algorithm is more accurate than the fixed step length method.
Enhanced nonlinear optical characteristics of copper-ion-doped double crossover DNAs.
Park, Byeongho,Lee, Byung Jic,Dugasani, Sreekantha Reddy,Cho, Youngho,Kim, Chulki,Seo, Minah,Lee, Taikjin,Jhon, Young Min,Choi, Jaebin,Lee, Seok,Park, Sung Ha,Jun, Seong Chan,Yeom, Dong-Il,Rotermund, RSC Pub 2015 Nanoscale Vol.7 No.43
<P>The modification of deoxyribonucleic acid (DNA) samples by sequencing the order of bases and doping copper ions opens the possibility for the design of novel nanomaterials exhibiting large optical nonlinearity. We investigated the nonlinear characteristics of copper-ion doped double crossover DNA samples for the first time to the best of our knowledge by using Z-scan and four-wave mixing methods. To accelerate the nonlinear characteristics, we prepared two types of unique DNA nanostructures composed of 148 base pairs doped with copper ions with a facile annealing method. The outstanding third-order nonlinear optical susceptibility of the copper-ion-doped DNA solution, 1.19 ?? 10(-12) esu, was estimated by the conventional Z-scan measurement, whereas the four-wave mixing experiment was also investigated. In the visible spectral range, the copper-ion-doped DNA solution samples provided competent four-wave mixing signals with a remarkable conversion efficiency of -4.15 dB for the converted signal at 627 nm. The interactions between DNA and copper ions contribute to the enhancement of nonlinearity due to structural and functional changes. The present study signifies that the copper-ion-doped double crossover DNA is a potential candidate as a highly efficient novel material for further nonlinear optical applications.</P>
Indoor 3D Pedestrian Tracking Algorithm Based on PDR using Smarthphone
Beomju Shin,Jung Ho Lee,Hyunho Lee,Eungyeong Kim,Jeahun Kim,Seok Lee,Young-su Cho,Sangjoon Park,Taikjin Lee 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
In this paper, we develop the indoor navigation system based on PDR (Pedestrian Dead Reckoning) using various sensors in smartphone. Usually PDR is consisted of step detection, step length estimation and heading estimation. The issue of PDR is step length estimation and to enhance the accuracy of step length, we apply the walking status recognition algorithm using ANN (Artificial Neuron Network). The features used in ANN are extracted through sensor signals of accelerometer and gyroscope. After recognizing the walking status, it is applied to estimate the step length. And when the status is recognized as stop, even if sensor signal is generated by redundant motion or movement of pedestrian, the moved distance is not calculated additionally and distance error is not increased. We use the barometric pressure sensor to extend the positioning area to whole building. To verify the proposed indoor navigation system, we implemented the application for android and conducted the experiment. Through the results, we demonstrated the accuracy of our system.
송전선로 검사로봇 프레임 구조의 동강성 설계에 대한 연구
이준영(Jun Young Lee),임지윤(Ji Youn Lim),김창환(Chang Hwan Kim),이택진(Taikjin Lee),이석(Seok Lee),임홍재(Hong Jae Yim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This paper presents to investigate dynamic stiffness of inspection robot with various frame structures through flexible multi body dynamic simulation. Transmission lines which simulated in finite element model are used to validate to experimental results. Natural frequency analysis of robot frame is conducted to compare with sub-span ocillation frequency. Multi body dynamic simulation model that is similar to the actual sub-span ocillation test environment is developed by using transmission lines and robot frame models. New 5 types robot frames with reduced the number of carbon pipes are proposed. Natural frequency analysis and multi body dynamic simulation of 5 types robot frame are conducted. The final robot frame model is confirmed that 29% of weight was reduced.