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With ample reserves of land available for cultivation, the realm depended on the acquisition and control of adequate manpower for farm labour and defence. The dramatic rise of Ayutthaya had entailed constant warfare and, as none of the parties in the region possessed a technological advantage, the outcome of battles was usually determined by the size of the armies. After each victorious campaign, Ayutthaya carried away a number of conquered people to its own territory, where they were assimilated and added to the labour force.  Ramathibodi II (–1529) established a corvée system under which every freeman had to be registered as a phrai (servant) with the local lords, Chao Nai ( เจ้า นาย ). When war broke out, male phrai were subject to impressment . Above the phrai was a nai ( นาย ), who was responsible for military service, corvée labour on public works, and on the land of the official to whom he was assigned. Phrai Suay ( ไพร่ ส่วย ) met labour obligations by paying a tax. If he found the forced labour under his nai repugnant, he could sell himself as a that ( ทาส , slave) to a more attractive nai or lord, who then paid a fee in compensation for the loss of corvée labour. As much as one-third of the manpower supply into the nineteenth century was composed of phrai . 
Plato regards education as a means to achieve justice, both individual justice and social justice. According to Plato, individual justice can be obtained when each individual develops his or her ability to the fullest. In this sense, justice means excellence. For the Greeks and Plato, excellence is virtue. According to Socrates, virtue is knowledge. Thus, knowledge is required to be just. From this Plato concludes that virtue can be obtained through three stages of development of knowledge: knowledge of one's own job, self-knowledge, and knowledge of the Idea of the Good. According to Plato, social justice can be achieved when all social classes in a society, workers, warriors, and rulers are in a harmonious relationship. Plato believes that all people can easily exist in harmony when society gives them equal educational opportunity from an early age to compete fairly with each other. Without equal educational opportunity, an unjust society appears since the political system is run by unqualified people; timocracy, oligarchy, defective democracy, or tyranny will result. Modern education in Japan and other East Asian countries has greatly contributed to developing their societies in economic terms. Nevertheless, education in those countries has its own problems. In particular the college entrance examination in Japan, Korea, and other East Asian countries caused serious social injustices and problems: unequal educational opportunity, lack of character education, financial burden on parents, and so on. Thus, to achieve justice, modern society needs the Platonic theory education, for Plato's philosophy of education will provide a comprehensive vision to solve those problems in education. There is also some controversy about the relationship between education and economics. It is a popular view common in East and West that businesses should indirectly control or even take over education to economically compete with other nations. However, Plato disagrees with this notion since business is concerned mainly with profit whereas a true education is concerned with the common good based upon the rational principle of individual and social justice.