The missing historical record of the Cassiopeia A (Cas A) supernova (SN) event implies a large extinction to the SN, possibly greater than the interstellar extinction to the current SN remnant. Here we investigate the possibility that the guest star that appeared near Cas A in 1592{1593 in Korean history books could have been an `impostor' of the Cas A SN, i.e., a luminous transient that appeared to be a SN but did not destroy the progenitor star, with strong mass loss to have provided extra circumstellar extinction. We rst review the Korean records and show that a spatial coincidence between the guest star and Cas A cannot be ruled out, as opposed to previous studies. Based on modern astrophysical ndings on core-collapse SN, we argue that Cas A could have had an impostor and derive its anticipated properties. It turned out that the Cas A SN impostor must have been bright (MV = - 14:72:2 mag) and an amount of dust with visual extinction of ≥ 2:8  2:2 mag should have formed in the ejected envelope and/or in a strong wind afterwards. The mass loss needs to have been spherically asymmetric in order to see the light echo from the SN event but not the one from the impostor event.

This study is one that estimates the architectural composition as well as the location of guest house of Haemi Eupseong on the basis of the analysis of modern and contemporary data related to Haemi Eupseong. It is significant that this study has presented an opinion that can become a practical basis for the historical research of the prototype of Haemi Eupseong of the late Chosun Dynasty through the analysis of modern and contemporary data that had been unsatisfactory among the fruition of studies conducted in relation to Haemi Eupseong. The outcomes achieved by this study are as follows. Firstly, it was verified that the guest house of Haemi Eupseong that has been restored is one that has different architectural composition than the prototype of the late Chosun Dynasty and is restored in a different location. Secondly, in respect of architectural composition of guest house found by the analysis of the picture, it was confirmed that the government office has one step higher than the double-wing house in the form of the roof. Thirdly, the location of the guest house of Haemi Eupseong of the late Chosun Dynasty is judged to be the periphery area where the current restored guest house is located, which is where the teachers' building of Haemi elementary school was located. Fourthly, the prospect of the guest house of Haemi Eupseong is decided to be similar direction to the current restored guest house with the greatest possibility of having the same direction with the arrangement of teachers' building of Haemi Eupseong elementary school.

The phase separated structure and the electo-optical properties of the polymer /liquid crystal(LC) composite films including a dye were investigated. The phase separated structure of the polymer /LC / dye composite film(GH composite film) including below 2wt% dye against LC was almost same with the composite film which does not include dye. But the electro-optical properties of the GH composite film strongly depended on weight fraction of the dye against the LC. The response time of the GH composite film increased with the increase of the dissolved dye in LC because the dye acts as a registivity for the orientation of LC molecules by the electric filed.