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유승원(Yoo, Seung-won) 역사학회 2011 역사학보 Vol.0 No.210
The foundation for conscription of the freeborn (yangin) was laid with the land reforms that were enacted at the end of the Goryeo period. The system was further developed under King Taejong, the third monarch of the Joseon Dynasty. This paper discusses two major developments made during Taejong"s reign. First, former officials who had received allocations of land in accordance with their rank in the government were required to render military service. Since Taejong"s reign, those former officers were assigned to sujeonpae; soldiers of army units stationed in Seoul under a system of rotation. When called up in turn for active duty, they served as palace guards. Second, by imposing military service on government officers who were the core of the ruling class without granting land or other benefits in return the principle of conscription of the freeborn, under which any freeborn male should bear military service could be applied more widely. Land grants were confiscated from former officers who had been granted land allocations and wanted to move outside the capital, as these officers were assigned to mu-sujeonpae under the condition that they maintain their residence in Seoul. Unlike sujeonpae, the military service obligation of mu-sujeonpae was hereditary. The policy for military service of former government officers under King Taejong produced results, but also had clear limitations. More than anything else, the imposition of military service on former officers was directed primarily at those who had been granted land allocations. As a result a system of conscription of the freeborn could not yet be fully implemented.
유승훈(Seung Hun Ryu),유승원(Seung Won Yoo),박종찬(Jong Chan Park),국종영(Jong Young Kuk),최정헌(Jung Hun Choi) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper has performed a test and analysis study on the woven glass and carbon fabric/epoxy laminate composite and sandwich panels of mid-size bus vehicle. Mechanical properties of core and composite materials are needed for accurate analysis of the sandwich composites. Elastic and shear modulus and poisson"s ratio of GFRP and CFRP and core material were established from the tension, shear and bending specimens test. Also, fatigue strength Se is established from the fatigue test using the stair case method that one of the statistical method. The fatigue test was conducted using a tension-tension load with a stress ratio R of 0.1 and frequency of 10 Hz. In order to do FE model verification and evaluate the structural behavior and safety of the joint structure of side panel, the static load tests such as vertical load and compressive load and torsion load tests have been conducted. Finally we achieve a lighter mid-bus structure satisfying the target stiffness, strength and durability, and this technique will be applicable to other vehicles and components.