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Accurate Compact MOSFET Modeling Scheme for Harmonic Distortion Analysis
Iniguez, B.,Picos, R.,Kwon, I.,Shur, M.S.,Fjeldly, T.A.,Lee, K. The Institute of Electronics and Information Engin 2004 Journal of semiconductor technology and science Vol.4 No.3
We discuss and develop a compact MOSFET modeling scheme in order to obtain accurate descriptions of the drain current and its derivatives up to the 5th order. We have analyzed the physical effects which govern the behaviour of the 3rd derivative in long and deep-subrnicron channel MOSFETs. Our modeling agrees well with experimental data and describes continuous transitions between operating regimes, thanks to the use of continuous functions, which do not introduce any artificial peaks.
Accurate Compact MOSFET Modeling Scheme for Harmonic Distortion Analysis
B. Iniguez,R. Picos,I. Kwon,M. S. Shur,T. A. Fjeldly,K. Lee 대한전자공학회 2004 Journal of semiconductor technology and science Vol.4 No.3
We discuss and develop a compact MOSFET modeling scheme in order to obtain accurate descriptions of the drain current and its derivatives up to the 5th order. We have analyzed the physical effects which govern the behaviour of the 3rd<br/> derivative in long and deep-submicron channel MOSFETs. Our modeling agrees well with experimental data and describes continuous transitions between operating regimes, thanks to the use of continuous functions, which do not introduce any artificial peaks.<br/>
Nabih Pico,Hong-ryul Jung,Juan Medrano,Meseret Abayebas,Dong Yeop Kim,황정훈,Hyungpil Moon 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
The objective of this work is to control a delivery robot equipped with a passive bogie that can successfully climb up steps of various sizes and move on uneven terrain in outdoor environments. The kinematic model of a six-wheel mobile robot is described in detail. Jacobian matrices and inverse kinematics are obtained to get the velocity of each wheel based on the desired velocity of the robot center of mass in conjunction with the terrain information obtained by the onboard sensors according to the contact angle estimation between the wheel and ground. A slip control is implemented based on slip ratio to adjust the wheel velocity when the slip is detected. Simulation and experimental results verify the effectiveness of the approach that enables the robot autonomously climbing up on different steps and uneven terrain.
Nabih Pico,Eui-Chan Kim,Sang-Hyeon Park,Meseret Abayebas Tadese,Huy Nguyen Tran,Beomjoon Lee,Hyungpil Moon 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
Wheeled robots are involved in different applications due to their adaptability to different terrains. The stability of the robot is related to the permanent contact of the wheels with the ground. This paper presents the method to recognize the geometry terrains in real-time when the wheel has contact at one or multiple contact points with the soil by using laser scanning sensors and measuring the contact angle between the wheel-ground. Furthermore, the robot can recognize when its wheel loses contact with the terrain. Thus, we can create a proper robot control by obtaining the Jacobian matrix and its inverse related to the terrain information. In consequence, the robot can overcome diverse terrains and move safely. The method is validated in experimental results when the six-wheeled robot recognizes a rocky terrain and a slope with a step.
Surgical management with intentional replantation on a tooth with palato-radicular groove
Forero-Lopez, Jorge,Gamboa-Martinez, Luis,Pico-Porras, Laura,Nino-Barrera, Javier Laureano The Korean Academy of Conservative Dentistry 2015 Restorative Dentistry & Endodontics Vol.40 No.2
A palato-radicular groove (PRG) is a developmental anomaly primarily found in the maxillary lateral incisors. It is a potential communication path between the root canal and the periodontium that decreases the survival prognosis of the affected tooth, therefore compromising the stability of the dental structure in the oral cavity. The aim of this case report is to present an original technique where a PRG was treated by means of intracanal disinfection, PRG sealing with glass ionomer, replantation with intentional horizontal 180 degree rotation of the tooth, and an aesthetic veneer placed to provide adequate tooth morphology. The clinical and biological benefits of this novel technique are presented and discussed.
Meseret A. Tadese,Francisco Yumbla,Nabih Pico,Hyungpil Moon 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
A precise dynamic model is critical for collaborative robots to achieve satisfactory performance in modelbased control or other applications such as dynamic simulation and external torque estimation. However, due to nonlinear friction behavior in robot actuation, it is difficult to identify precise dynamic parameters. In this paper, a reliable dynamic friction model, which incorporates the influence of temperature fluctuation on joint friction, is utilized to increase the accuracy of identified dynamic parameters. First, the friction of the joint module is investigated. Extensive test series are performed in the full velocity operating range at temperatures ranging from 23 ℃ to 51 ℃ to investigate friction dependency on joint module temperature. Then, dynamic parameter identification is performed using the inverse dynamics identification model and weighted least squares method. Based on the friction model identified in the first step, friction toque is computed, and the effect is eliminated by subtracting it from experimental data for dynamic parameter identification. Finally, the proposed notion is verified experimentally, and the results demonstrate that using a precise dynamic friction model improves the accuracy of dynamic parameters identification.
Um, Eujin,Nunes, Janine K.,Pico, Tamara,Stone, Howard A. The Royal Society of Chemistry 2014 Journal of Materials Chemistry B Vol.2 No.45
<P>We present a microfluidic method to continuously produce multicompartment microfibers, where embedded single or double emulsion droplets are regularly spaced along the length of the fiber. Both hydrophobic and hydrophilic compounds can be encapsulated in different microcompartments of the fiber for storage, selective dissolution, and delivery applications, as well as to provide multifunctionality.</P>
Peri-implantitis, systemic inflammation, and dyslipidemia: a cross-sectional biochemical study
Carlota Blanco,Antonio Liñares,Jose Dopico,Alex Pico,Tomás Sobrino,Yago Leira,Juan Blanco 대한치주과학회 2021 Journal of Periodontal & Implant Science Vol.51 No.5
Purpose: The aim of this study was to compare the inflammatory and lipid profile of patients with and without peri-implantitis. Methods: A cross-sectional biochemical study was carried out in which blood samples were collected from 16 patients with peri-implantitis and from 31 subjects with healthy implants. Clinical peri-implant parameters were obtained from all subjects. Levels of tumor necrosis factor-alpha and interleukin-10 (IL-10) were measured in serum. Lipid fractions, glucose and creatinine levels, and complete blood count were also assessed. Results: After controlling for a history of periodontitis, statistically significant differences between peri-implantitis patients and controls were found for total cholesterol (estimated adjusted mean difference, 76.4 mg/dL; 95% confidence interval [CI], 39.6, 113.2 mg/dL; P<0.001), low-density lipoprotein (LDL) cholesterol (estimated adjusted mean difference, 57.7 mg/dL; 95% CI, 23.8, 91.6 mg/dL; P<0.001), white blood cells (WBC) (estimated adjusted mean difference, 2.8×103/μL; 95% CI, 1.6, 4.0×103/μL; P<0.001) and IL-10 (estimated adjusted mean difference, −10.4 pg/mL; 95% CI, −15.8, −5.0 pg/mL; P<0.001). The peri-implant probing pocket depth (PPD) was modestly positively correlated with total cholesterol (r=0.512; P<0.001), LDL cholesterol (r=0.463; P=0.001), and WBC (r=0.519; P<0.001). A moderate negative correlation was observed between IL-10 and PPD (r=0.609; P<0.001). Conclusions: Otherwise healthy individuals with peri-implantitis showed increased low-grade systemic inflammation and dyslipidemia.