Author: 공과대학 교학팀

Observing atmospheric chemical components from the space: applications to air pollution and climate studies

Observing atmospheric chemical components from the space: applications to air pollution and climate studies

Observing atmospheric chemical components from space: applications to air pollution and climate studies   Rokjin Park School of Earth and Environmental Sciences, Seoul National University   Observing the earth’s radiances from space can be an effective approach to monitoring atmospheric chemical composition, which changes cause various environmental issues, including local air pollution and global climate changes. Low-orbiting satellites have been widely used to provide global-scale information and are often limited by their infrequent overpass times, which could be hampered by clouds. Since the first geostationary environmental monitoring spectrometer (GEMS) has been successfully launched by the Korean Ministry of Environment, we are in a new era of satellite observations. This talk mainly focuses on developing GEMS retrieval algorithms to observe volatile organic compounds (VOCs) column concentrations in East Asia and the first evaluation of GEMS VOCs observations. Furthermore, I will talk about some issues related to greenhouse gas concentrations whose emissions are highly uncertain, which are diagnosed by satellite observations....

Atomically thin 3D semiconductors

Atomically thin 3D semiconductors   Jong-Hoon Kang   Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea​   3D architecture design and process with thin and lightweight components is promising for high-speed and low-power operation towards next generation electronics and optoelectronics. However,...

Recent developments in multi-scale and non-linear topology optimization problems

Recent developments in multi-scale and non-linear topology optimization problems By Ole Sigmund, Villum Investigator, Dept. of Mechanical Engineering, Technical University of Denmark Topology optimization was introduced as a multi-scale approach in the seminal paper by Bendsøe and Kikuchi from 1988. However, simpler isotropic density interpolation schemes soon substituted the original homogenization-based approach. With advances in additive manufacturing technologies that may realize complex lattice and infill structures, needs for efficient...

Bioinspired Artificial Cameras: Optic Components and Imaging Sensors

Bioinspired Artificial Cameras: Optic Components and Imaging Sensors   Young Min Song*,1    1School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea e-mail corresponding author: ymsong@gist.ac.kr   Key words: Bioinspired Optical Sensors, Bioinspired Photonics, Imaging Systems, Digital Cameras, Optic Components   Abstract   The diverse vision systems in nature can provide attractive design inspiration for imaging devices, ranging from optical subcomponents to digital cameras and visual prostheses, with more desirable optical characteristics than conventional imagers. The advantages of natural vision systems include high visual acuity, wide field of view, wavelength-free imaging, improved aberration correction and depth of field, and high motion sensitivity. Recent advances in soft materials, ultrathin electronics, and deformable optoelectronics have facilitated the realization of novel processes and device designs that mimic biological vision systems. This tutorial introduces recent progress and continued efforts in the research and development of bioinspired artificial eyes. At first, the configuration of two representative eyes found in nature: a single-chambered eye and a compound eye, is explained [1, 2]. Then, recent advances in bioinspired optic components and image sensors are discussed regarding materials, optical/mechanical designs, and integration schemes [3-6]....

Development of in vivo tooth dosimetry using EPR(electron paramagnetic resonance) spectroscopy

* This seminar will be held in Korean. ...

Estimation of Arctic sea ice thickness from satellite radiometer measurements

Understanding new material quantum dots applied with new and renewable energy

Next generation materials for display and solar cells  Gi-Hwan Kim 소속 School of Materials Science and Engineering Gyeongsang National University (GNU), Republic of Korea E-mail: ghkim@gnu.ac.kr     Quantum dots and perovskite materials are two of the most promising technologies being developed for the next generation of solar cells and LEDs. Both of these technologies are seen as a major breakthrough in the field of renewable energy and have the potential to revolutionize the way we harness and utilize energy.   Quantum dots are tiny semiconductor particles that exhibit unique optical and electronic properties due to their small size. They are capable of absorbing and emitting light of a specific wavelength, making them an ideal material for use in solar cells and LEDs. One of the key advantages of using quantum dots in solar cells is that they can be engineered to absorb different wavelengths of light, allowing for the capture of more solar energy than traditional solar cells. Additionally, quantum dots can also be used to enhance the efficiency of LEDs by improving their brightness and color accuracy. Perovskite materials are a class of materials that have gained significant attention in the field of solar cell development in recent years due to their high efficiency and low cost. Perovskite solar cells are made by depositing a thin layer of perovskite material onto a conductive substrate, which can be produced using simple and inexpensive methods. The efficiency of perovskite solar cells has increased rapidly in recent years, with some devices achieving efficiencies that are comparable to traditional silicon-based solar cells. Perovskite materials can also be used to create efficient and bright LEDs by improving the quality and stability of the materials used in their construction. Research into the development of quantum dot and perovskite-based solar cells and LEDs is ongoing, and significant progress has been made in recent years. However, there are still several challenges that must be overcome before these technologies can be widely adopted. For example, quantum dots can be expensive to produce, and there are concerns about their toxicity and environmental impact. Perovskite materials are also prone to degradation when exposed to moisture and oxygen, which can limit their long-term stability and reliability. Despite these challenges, the potential benefits of quantum dot and perovskite-based solar cells and LEDs are significant. These technologies have the potential to significantly reduce the cost of renewable energy and improve the efficiency and performance of lighting systems. As research continues, it is likely that we will see these technologies become increasingly important in the development of next-generation solar cells and LEDs, helping to create a brighter and more sustainable future for us all....

Energy self-sufficient desalination technology based on seawater resource

Halide Perovskite Memristors for Neuromorphic Computing Devices

Halide Perovskite Memristors for Neuromorphic Computing Devices   Ho Won Jang   Department of Materials Science and Engineering, Seoul National University, Korea   E-mail: hwjang@snu.ac.kr     Halide perovskites, fascinating memristive materials owing to mixed ionic-electronic conductivity, have been attracting great attention as artificial synapses recently. However, polycrystalline nature in thin film form...