In this study, AlSi10Mg powders with average diameters of 44 μm are additively manufactured into bulk samples using a selective laser melting (SLM) process. Post-heat treatment to reduce residual stress in the as-synthesized sample is performed at different temperatures. From the results of a tensile test, as the heat-treatment temperature increases from 270 to 320oC, strength decreases while elongation significantly increases up to 13% at 320oC. The microstructures and tensile properties of the two heat-treated samples at 290 and 320oC, respectively, are characterized and compared to those of the as-synthesized samples. Interestingly, the Si-rich phases that network in the as-synthesized state are discontinuously separated, and the size of the particle-shaped Si phases becomes large and spherical as the heat-treatment temperature increases. Due to these morphological changes of Si-rich phases, the reduction in tensile strengths and increase in elongations, respectively, can be obtained by the post-heat treatment process. These results provide fundamental information for the practical applications of AlSi10Mg parts fabricated by SLM.

Facial numbness restricted to the distribution of the mental nerve(mental neuropathy) is called "numb chin syndrome". The clinical importance of this syndrome is associated with first recognition of involvement of malignant diseases. The malignant neoplasm with numb chin syndrome show rapid progression and high mortality. We present a 43-year-old female who had been treated by radiotherapy for precursor T-cell leukemia/lymphoma involving the central nervous system( CNS) previously and later developed mental nerve invasion without central nervous system recurrence. MRI images revealed the CNS tumor mass remitted, and there was no identified peripheral nervous system(PNS) involvement including the mental nerve invasion, nevertheless the patient complained of consistent numbness and pain on right mandibular area. This is the first case of precursor T-cell leukemia/lymphoma accompanying mental nerve invasion without recurrence for central nervous system. Proper interpretation for mental neuropathy may lead to the prompt diagnosis and therapeutic intervention.

This dissertation was embarked upon for the historical examination and the missiological academic analysis of ‘The state-political character of the mission of the Russian Orthodox Church, which has been mentioned widely without any academic examination. This kind of study is necessary to understand rightly the Eastern Orthodox world which was drawn to the Korean church immediately after the collapse of USSR, and to establish the proper relationships between the old USSR and the Eastern European people as well as how best to evangelize them. The researcher analyzes the Russian archives in relation to the missions of Russian Orthodox Church. He carefully examines and analyzes closely the historical materials from 1860 till 1917(Bolshevik Revolution) including the mission of the Russian Orthodox Church to the immigrant Koreans and those between 1897 and 1925 in relation to the mission to the Koreans in the Korean peninsula. In the result of this analysis, it could be said that the mission of Russian Orthodox Church was a reverse movement to the mission of Trinitarian God transcendent to man-made boundaries. It was mission as an instrument not for serving the interest of God toward the whole world, but for serving the interest of his or her own country alone. It was a distorted mission far from demonstrating the love of God because of absolutizing the nationalistic political ideology ‘russiani-zation’ As a result, it became heterogeneous apart from the right motif, goal and method of God’s mission. In the result of this study, it became possible to describe concretely the character and mode of the state-political mission of Russian orthodox church which has been vaguely mentioned and to have a theoretical prospect the general results which might happen in the process of the state-political missions. This study could probably be an available knowledge not only for those who are participating in missions to the people who has lived in the state-political mission world, but also for those who wish to evangelize it, cooperate with the Eastern Orthodox churches as well as offer invaluable suggestions to the mission scholars around the world.