Abstract:In the organic light-emitting diode display industry, Invar exhibits anomalously low thermal expansivity and is, therefore, used as a material for fine metal masks, which are necessary components for the evaporation process of diode materials. We present an electroforming method for fabricating Fe-Ni alloys with a coefficient of thermal expansion lower than that of conventional Invar. The principle of controlling the thermal expansivity of electroformed Fe-Ni alloys is clarified in terms of the behavior of the phases constituting them. The cause of the Invar anomalies, which has not yet been fully elucidated, is explained by combining the Weiss model based on the electron configurations of Fe atoms and a model that we propose based on atom configurations.

The purpose of this paper is to identify the topographical landscape of the Bronze age sites in the midstream area of the Boseong River which is currently submerged using the palaeomorphic environment analysis method and to restore the scale of the settlements. As a result of the palaeomorphic environment analysis, mountain(hills and pebbles), terrace, natural levee, alluvial fans, river island, and old river channel were observed in the midstream area of the Boseong River. Although there is a slight difference in the size of the settlement, the main location of the sites is the terrace. Terrace, a stable terrain free from river flooding, has been the best terrain for resident who have been living a settled life since prehistoric times. In order to resolve the uneven excavation status between settlements and tombs, the distribution ratio of 1 (dolmen): 10 (residential) surveyed in the Dalong district of Daegok-ri was substituted to calculate the residential prediction base for the terrain where dolmen were concentrated. As a result of analyzing the density of the settlements(residential base number/100㎡), the large settlements, central settlements, and middle settlements are separated, and the settlements is a residential center type, the tomb is a tomb center type, and the topography is different. The dolmens functioned to view the settlements and monitor other areas around it. The larger the settlement, the more a connecting network was formed within the relationship between the settlements. On the other hand, in unit settlements, settlements and tombs coexist within the same topographic space. The construction of a group of dolmens in an alluvial site away from the mountain seems to have been intended to maintain and strengthen the identity of the community.