박찬 교수

Most of the known cuprate superconductors are shown to belong structurally to a single family and are closely related to each other. The relationships between the structures of cuprate superconductors are reviewed with emphasis on their similarities. Individual details of the structures are ignored and only idealized structures are discussed. A formula is used to describe the basic structures of the cuprate superconductors. Crystal structure analysis leads to three significant insights into the

In this article we report point defect-assisted doping mechanism and related thermoelectric transport properties in Pb-doped BiCuOTe compounds.

The electrical conductivity of the cubic phase, which is larger than that of the monoclinic phase, and similar thermal conductivities of the two phases lead to the higher <italic>ZT</italic> of the cubic Cu₂SnSe₃.

In this paper, we present a method for finding the enhanced heading and position of pedestrians by fusing the Zero velocity UPdaTe (ZUPT)-based pedestrian dead reckoning (PDR) and the kinematic constraints of the lower human body. ZUPT is a well known algorithm for PDR, and provides a sufficiently accurate position solution for short term periods, but it cannot guarantee a stable and reliable heading because it suffers from magnetic disturbance in determining heading angles, which degrades the o

SnSe is considered as a promising thermoelectric (TE) material since the discovery of the record figure of merit (ZT) of 2.6 at 926 K in single crystal SnSe. It is, however, difficult to use single crystal SnSe for practical applications due to the poor mechanical properties and the difficulty and cost of fabricating a single crystal. It is highly desirable to improve the properties of polycrystalline SnSe whose TE properties are still not near to that of single crystal SnSe. In this study, in o

A smart window based on VO2 is a promising thermochromic (TC) glass that can regulate heat flow through windows by solar modulation near room temperature. TC glasses with high visible-light transmittance and large difference in infrared transmittance between high- and low-temperature VO2 phases are required to save large amounts of energy in buildings. VO2-based multilayer films with a buffer layer and/or an anti-reflective (AR) layer are used when the films are deposited by sputtering. In this

A novel synthesis method to prepare Si3N4 nanowires from amorphous silicon nitride (a-Si3N4) powder synthesized by a low-temperature vapor-phase reaction method was investigated. Highly crystalline α-Si3N4 nanowires were synthesized by heat treatment of the a-Si3N4 powder under ammonia atmosphere. The surface of the nanowires was smooth and clean without any attached particles. The thickness of the nanowires was in the range of ∼200–300 nm with lengths of tens of micrometers. The nucleation of n