A5101929797- Advanced Thermoelectric Materials and Devices
- Nuclear Materials and Properties
- Thermal Radiation and Cooling Technologies
- Innovative Energy Harvesting Technologies
- Nuclear reactor physics and engineering
- Spacecraft Design and Technology
- Geotechnical Engineering and Soil Stabilization
- Nuclear materials and radiation effects
- Intermetallics and Advanced Alloy Properties
- Space Satellite Systems and Control
- Geotechnical Engineering and Underground Structures
- Advanced Sensor and Energy Harvesting Materials
- Radioactive element chemistry and processing
- Inertial Sensor and Navigation
- Transportation and Mobility Innovations
- Fusion materials and technologies
- Phase Change Materials Research
- Advanced ceramic materials synthesis
- Transportation Planning and Optimization
- Urban Transport and Accessibility
- Radiative Heat Transfer Studies
- Thermal Analysis in Power Transmission
- Perfectionism, Procrastination, Anxiety Studies
- Bauxite Residue and Utilization
- Photochromic and Fluorescence Chemistry
Incheon National University
2024-2025
Ulsan National Institute of Science and Technology
2019-2021
Korea Institute of Materials Science
2021
Kyung Hee University
2020
Chungnam National University
2015
Abstract Thermoelectric power generation offers a promising way to recover waste heat. The geometrical design of thermoelectric legs in modules is important ensure sustainable but cannot be easily achieved by traditional fabrication processes. Herein, we propose the cellular architectures for efficient and durable generation, realized extrusion-based 3D printing process Cu 2 Se materials. We optimum aspect ratio cuboid leg maximize output extend this mechanically stiff hollow hexagonal...
Abstract Thermoelectric (TE) technologies offer promising means to enhance fossil energy efficiencies by generating electricity from waste heat industrial or automobile exhaust gases. For these applications, thermoelectric modules should be designed the perspective of system integration for efficient transfer, simplification, and low processing cost. However, typical manufactured traditional processes do not fulfil such requirements, especially pipes. Hence, a 3D‐printing method PbTe...
Abstract Aromatic imides are an important class of organic mechanoluminescence (ML) compounds. Color is one the most ML properties, and it was previously modified by preparing various aromatic imide derivatives using chemical synthesis. In this report, we present a simple alternative strategy where single solution‐mixed crystallized with commercial dyes to produce mixtures that exhibit new colors. Specifically, blue in its pure form, could be changed pink, yellow, or weak white color Eosin...
The development of commodity polymer upcycling methods, which can turn plastic waste into new functional polymers, is an important approach to reducing the burden on environment. Here we report a Birch reduction that compatible with polystyrene (PS), PS derivatives, and several types using 1 min ball-mill grinding approach. In most cases, full conversion repeat units was achieved, yielding primarily dearomatized skipped diene unit, without chain scission, minimal cross-linking. With our...
최근 전력구 지중 송전선의 허용 전류용량에 대한 정부규제로 인해 공사에 현장 되메움재의 열적 거동에 연구가 중요해졌다. 점차 증대되는 고용량 전력공급에 수요와 더불어, 전류용량을 산정하기 위해, 전력 케이블 주변 온도 증가를 유발하는 요인을 예측하고 분석하는 것이 시급하다. 내부의 과도한 열확산으로 인한 송전선로 주변의 증가는 송전선 자체의 열저항을 증가시켜 절연 파괴 및 열 폭주 현상을 야기한다. 따라서 설계 시공시, 되메움재에 따른 열거동 메커니즘을 규명하는 매우 중요하다. 본 논문에서는 시험시공을 기반으로, 전력구내부와 주변지반의 변화 위한 수치해석 모델을 개발하였다. 파악을 수치해석은 현장시험 시공시 획득한 4개의 다른 종류의 그리고 물리적 물성치를 기반으로 수행되었다. 또한, 실내 시험을 통해 산정한 각 모델에 입력변수로 적용했다. 내부에 일정한 열량이 공급될 때, 단위중량, 함수비, 특성 등 여러 변수를 고려한 메카니즘을 모사할 수 있도록 구성하고 1년 동안의...
Various compositions of CeO2–Ce3Si2 (0, 10, 30, 50, and 100 wt%Ce3Si2) composites were fabricated using conventional sintering spark plasma sintering. Lower relative density, enhanced interdiffusion oxygen silicon, silicide agglomerations from the congruent melting Ce3Si2 at 1390 °C only observed conventionally-sintered pellets. Thermal conductivity sintered was calculated measured thermal diffusivity, specific heat, which exhibited dense (>90 %TD) homogeneous microstructure. The composite...
Solar sails propel using solar radiation pressure, and CNUSAIL-1 is a 3U-sized cube satellite with 4m area sail. This paper describes attitude controller carries out numerical simulations for that equipped small The must perform nadir pointing maneuver testing effects of the sail minimum aerodynamic drag in circular orbit 700km altitude. For purpose operation, B-dot PD quaternion feedback are implemented by taking into account three-axis magnetic torquer reaction wheel as actuator. To verify...
CNUSAIL-1은 태양돛을 탑재한 3U 크기의 큐브위성이다. 저궤도에서 전개하고, 이에 따른 자세와 궤도에 대한 영향을 확인하는 임무를 수행한다. 본 논문에서는 CNUSAIL-1을 위한 자세결정 알고리즘의 구현 가능성을 제시하였다. 위성의 기준센서는 태양센서, 3축 지자기센서를 이용하며, 관성센서는 MEMS 자이로센서를 사용한다. 큐브위성용 센서는 상대적으로 저가이며, 성능 및 잡음특성이 좋지 않은 단점이 있다. 따라서 알고리즘으로 노이즈 특성을 고려할 수 있는 확장칼만필터를 적용하였다. 또한 자세결정의 결정론적 방법인 QUEST 알고리즘과 비교하여 그 타당성을 검증하였다. This paper discusses the attitude determination of CNUSAIL-1 cube-satellite. The primary mission is sail deployment and operation in low Earth orbit, secondary to look...
Abstract Thermoelectric (TE) power generation offers a promising way to recover waste heat. The geometrical design of TE legs in modules is important ensure sustainable but cannot be easily achieved by traditional fabrication processes. Herein, we propose the cellular architectures for efficient and durable generation, realized extrusion-based 3D printing process Cu 2 Se materials. We designed optimum aspect ratio cuboid leg maximize output extended this mechanically stiff hollow hexagonal...
The CNUSAIL-1 project aims to develop and operate a 3U-sized cube satellite with solar sail mechanism. primary mission is successfully deploy the in low earth orbit, secondary collect scientific data for effect of deployment operation on orbit maneuver attitude change satellite. For this, bus system will transmit dynamic visual images operation. This paper describes conceptual design CNUSAIL-1. actuation/operation are preliminarily designed terms control system, communication electrical...
포발사 지능형 유도탄약은 일반 유도탄과 달리 극한의 초기발사조건 때문에 탄약의 초기자세 설정이 불가능하다. 또한 발사초기 강한 물리적 충격을 받으므로 유도탄약 내부에 장착된 GPS(Global Position System) 및 관성항법장치(INS, Inertia Navigation System)는 전원이 인가되지 않은 상태에서 발사가 되고, 비행 중 항법 초기화를 통해 탄의 현재 상태를 추정하여 유도조종을 수행할 수 있으며 최종적으로 표적타격 정확도를 향상시킬 있다. 하지만 특성에 따라 포강의 강선에 의해 발생하는 초당 20∼30회의 회전력 회전각을 추정하는 것은 매우 어려우면서도 많은 오차요인을 가지고 선진국에서 개발 완료된 유도탄약인 M982(엑스켈리버)의 경우 GPS 수신강도 변화와 회전율을 이용하여 추정한다. 이 방법은 회전율이 일정시간 동안 일정하게 유지되지 않으면 추정 정확도가 떨어지는 등 문제가 논문에서는 유도탄약에 탑재된 측정치의 미분/회전변환 후 INS의...
Nowadays, a number of people with visual impairments (PVI) access public buses in the Seoul metropolitan area. Existing studies reported challenges PVI faced when they use multiple cities. Nevertheless, little is known about accessibility issues (SMB). To reduce gap, we conducted semi-structured interviews nine to investigate and opportunities for accessible SMB. We discovered ten Based on identified challenges, propose three improving SMB system.