A5101616423- Advanced Aircraft Design and Technologies
- Aerospace Engineering and Control Systems
- Advancements in Battery Materials
- Aerospace and Aviation Technology
- Acoustic Wave Phenomena Research
- Noise Effects and Management
- Bone Tissue Engineering Materials
- Dental Implant Techniques and Outcomes
- Guidance and Control Systems
- Electrochemical sensors and biosensors
- Hearing Loss and Rehabilitation
- Conducting polymers and applications
- Robotic Path Planning Algorithms
- UAV Applications and Optimization
- Arsenic contamination and mitigation
- Fluoride Effects and Removal
- Electrospun Nanofibers in Biomedical Applications
- Electron and X-Ray Spectroscopy Techniques
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Microwave Engineering and Waveguides
- Coal and Its By-products
- Supercapacitor Materials and Fabrication
- Energy Harvesting in Wireless Networks
- Aerospace Engineering and Energy Systems
University of Ulsan
2023-2024
Seoul National University
2019-2023
Korea Advanced Institute of Science and Technology
2022
Kyungpook National University
2020
University of Michigan
2017-2018
Ann Arbor Center for Independent Living
2017
Jeonbuk National University
2013-2014
Korea University
2011
Chung-Ang University
2010
University of Florida
2000-2005
This paper focuses on the uncertainty propagation in flight performance of multirotor-type unmanned aerial vehicles from systematic perspective conceptual design phase. The multirotor is estimated by a and analysis framework which capable predicting for given mission profiles specifications. In this study, not only are parametric uncertainties considered components such as rotor, motor battery, but also model aerodynamics electric propulsion system models taken into account. methods adopting...
Background and Objectives: Hydroxyapatite has biocompatibility bioactivity similar to bone of in human body.The purpose this study is evaluate osteogenic differentiation marrow stem cell (BMSC) PLGA Scaffold added various ratio hydroxyapatite (HAp).Methods Results: PLGA/HAp scaffold were prepared using solvent casting/salt-leaching method.BMSC was seeded on the samples cultured 37 o C incubator with 5% CO2 for 28 days.Alkaline phosphatase (ALP) carried out alkaline activity at 1, 3, 7, 10 14...
This paper, split into Parts I and II, reviews recent innovations in circuit design that have accelerated the miniaturization of sensor nodes. Design techniques for key building blocks, such as interfaces, timing reference, data communication, energy harvesting, power management are reviewed. In particular, Part introduces analog interfaces miniaturized The budget system is highly restricted due to small battery volume. Therefore, ultra-low critical enablers compact monolithic integration...
This two-part paper reviews recent innovations in circuit design that have accelerated the miniaturization of sensor nodes. In this second part paper, we focus on key building blocks miniaturized nodes, such as data transceivers, energy harvesters, power management units, and digital logic circuits. System level considerations are also discussed to provide guidelines for a system. As an example prototype design, 2.7-cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Purpose: The 2017 international consensus guidelines (ICG) for intraductal papillary mucinous neoplasm (IPMN) of the pancreas were recently released.Important changes included addition worrisome features such as elevated serum CA 19-9 and rapid cyst growth (>5 mm over 2 years).We aimed to clinically validate ICG compare diagnostic performance between 2012 ICG.Methods: This was a retrospective cohort study.During January 2000-January 2017, patients who underwent complete surgical resection...
In recent years, the technical advancement of electric propulsion systems has contributed to growing applicability multirotor-type unmanned aerial vehicles from personal hobbies industrial fields. Industrial fields involve various mission profiles comprising several mission-legs, such as hover and forward flight. Thus, enhancing multirotors requires them be designed for specific profiles. This paper presents systematic design analysis methods realizing optimum carrying out user-defined...
하이드록시아파타이트는 골 전도가 우수하고 생체 적합성이 우수하며 염증 반응을 일으키지 않아 임상에서 골이식재로 널리 사용되고 있다. 본 연구에서는 하이드록시아파타이트를 함유한 poly(lactic-co-glycolic acid) (PLGA) 지지체를 제조하였으며 내/외의 실험을 통하여 이식재로서의 응용가능성을 평가하였다. 하이드록시아파타이트/PLGA 지지체는 0, 10, 20, 40 및 60 wt%의 함량으로 제조하였다. 기계적 특성을 알아보기 위하여 압축강도, SEM, FTIR을 측정하였으며 MTT, RT-PCR, FACS, 조직학적 염색(H&E, ED-1)을 실시하였다. 그 결과 PLGA 지지체에서 반응이 감소하는 것을 확인할 수 있었으며 가능성을 보여주었다. Hydroxyapatite has osteoconductivity, biocompatibility and noninflammatory, it been used clinically as artificial bone....
The rising demand for high‐performance lithium‐ion batteries (LIBs) emphasizes the need precise electrode design. carbon binder domain (CBD) within electrodes, crucial electron transport and structural integrity, can impede reduce electrochemically active sites. This study leverages digital twin technology to investigate impact of CBD distribution along thickness on LIB cathode performance. Virtual cathodes with varying configurations are generated, their performance using 3D heterogeneous...
The lithium-ion battery (LIB) electrode consists of an active material, a conductive additive, and binder, with the pores filled liquid electrolyte. additive compensates for intrinsic low electrical conductivity while binder enhances mechanical bonding between components. These constituents collectively form carbon domain (CBD). CBD assumes passive role in electrochemical behavior; however, it exerts adverse effects at microscale, obstructing Li-ion transport pathways reducing reaction...
Quadrotors are utilized in various applications, such as industrial and public services. Despite their the operation of quadrotors is restricted by wind disturbances due to small size multiple propellers. The cause additional thrusts propeller, resulting more battery energy. To consider energy, this study developed a multidisciplinary simulation tool that can estimate control performances changed corresponding capacity. was validated comparing analysis results with those flight test data....
We have developed a solution that enables the performance analysis and optimal design of multicopter type small drones meet various mission profiles named CLOUDS (Conceptual Layout Optimization Universal Drone Systems) verified its hovering time prediction capability. Even though similar research has been carried out in past, as far authors know is first capable not only performing for all flight regimes such climb, descent, hovering, forward flight, but also based on profile.
This paper presents a control algorithm of contact-based inspection for an Unmanned Aerial Vehicle (UAV) manipulator without using force sensor. The conventional operation methods ground-based require sensor, but the measurement is noisy on uneven surfaces. can cause unstable flight UAV when direct as input. To resolve this issue, we design contact-force estimation and desired trajectory generation algorithm. Contact-force estimated by dynamics IMU In addition, to track concave wall safely,...
Auralizations and other computer model studies were used to predict qualitative quantitative measures of speech intelligibility in classrooms under realistic conditions background noise reverberation. Speech tests given college students two one racquetball court at 5 signal-to-noise ratios. the made from computer. then administered a sound booth using auralized material. Fifteen different acoustical measurements related also multiple locations actual models classrooms. The scores on rooms...
Downwash effect is the interaction between rotor wake and a launched rocket. Since alters initial motion of rocket, comprehensive analysis crucial in predicting entire trajectory range In addition, external winds affect as alter downwash effect. Because affected ranges do not appear to be investigated sufficiently, this study aims reveal variance characteristics focusing on winds. Using an actuator model six-degrees-of-freedom analysis, trajectories rocket due are described. The unguided for...
본 연구에서는 신경세포인 슈반세포(SC)의 증식에 가장 적합한 생체재료를 연구하였다. 락타이드 글리콜라이드 공중합체(PLGA)에 탈미네랄 골분(demineralized bone particle, DBP), 소장점막하조직(small intestine submucosa, SIS), 그리고 실크를 각각 20% 첨가하여, 용매 증발법으로 각각의 필름을 제조하고, SC세포의 부착과 증식을 확인하기 위해 MTT, SEM RT-PCR 분석을 실시하였다. 또한 필름의 친수성을 접촉각을 측정하였다. 분석 결과, PLGA/DBP 필름에서 높은 보였으며, SC의 증식률이 다른 군에 비해 크게 증가한 것을 확인할 수 있었다. 따라서 필름은 중추신경재생 재료로 활용할 있을 것으로 사료된다. This study was designed to find an appropriate biomaterial proliferate Schwann cell (SC). Poly(lactic-co-glycolic...
A multirotor electric vertical takeoff and landing (EVTOL) aircraft is specialized for intracity point-to-point urban air mobility services due to its advantages of efficient hover performance, high gust resistance, relatively low noise. Because multiple rotors, rotor–rotor interference inevitably affects flight mainly depending on inter-rotor distance rotor rotation directions. It assumed that there exists an optimal direction a given lot rotors. In this study, the aim investigate various...
<title>Abstract</title> This study used a new X-ray fluorescence (XRF)-based analytical method with better precision and sensitivity to evaluate the fluorine concentrations in soil. It was hypothesized that XRF pellet-synthesizing procedure may effectively analyze soil ease reliability. The total determined using were compared those three different types of protocols—incineration/distillation, alkaline fusion, aqua regia extraction procedures. Among procedures, incineration/distillation did...