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백용기,권혁민,안재훈,오정호 한국복합신소재구조학회 2015 복합신소재구조학회 학술발표회 Vol.2015 No.04
This study investigates the application of net-hose system to sustain a vegetated slope reinforcement. The net-hose system is designated to improve water supply to the vegetation that can suffer the lack of water in case of extreme drying condition or rock slope where the water supply is relatively insufficient to ensure the growth of vegetation. A series of laboratoy tests were conducted to check the structural adequacy and effectiveness of net-hose net hose system. The results indicated that the model slope equipped with net-hose system seemed to provide better water supply leading to more vegetated areas and higher matric suction due to active water uptake capacity, which might be contributed to greater shear strength of slope surface. A limited numerical analysis was conducted to verify the effect of water uptake of vegetated root system that generally yields better slope stability.
백용기,강을손,정동익,최원봉 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.4
Two kinds of alumina specimens with different grain size (1 and 51 $\mu\textrm{m}$) but same density were prepared by hot-pressing. Fracture strength and fracture toughness of these specimens at low strain rate, sonic velocity, and elastic property were evaluated. Ballistic performance against Cal. 50 AP projectile was characterized by thick-backing method by using A16061-T6 reference block. Mechanical properties measured at low strain rate showed that the specimen with samll grain (SG) were better than specimen with large grain (LG). Fracture strength and fracture toughness of LG specimen were 131 MPa and 3.01 MPa{{{{ SQRT { m} }}, but those of SG specimen were 349 and 4.23, respectively. Sonic velocity and elastic properties of these specimen were similar, but bulk velocity and bulk modulus were different at amount of 4 and 9%. The tendency of ballistic performance was not consistent with the mechnaical properties at low strain rate. The ballistic performance based on quantitative efficiency revealed that the LG specimen (5.13) was ballistically better than the SG specimen (4.00) in spite of their lower mechanical properties.
백용기 한국기독교학회 2005 한국기독교신학논총 Vol.37 No.-
The Basic foundation on the interpretation of History by Paul Tillich is placed on the Historical deed. By him the Theory of History is not possible without historical Practice. Through his activities and a process of theological development, this interpretation of history is well expressed. Especially his political Activity in religious social movement joined with his theoretical working. His important concepts could not be spread out without argument with the socialism under these circumstances. So the continuity of essence and idea of his Theology to prove man, must be careless of the concrete and historical roots in the his religious socialism. Tillich summaries the meaning of the History into the concept of the Kingdom of God. The religious socialist understood the situation after the First World War as an epoch-making moment. This moment provided a decisive historical turning point and could be realized by the political practice. In this connection Tillich developed the Kairos as the central concept of theory of History. which could be recognized through responsible deed and concrete political practice. He termed this responsible deed "grasping the religious realism," which experienced the absolute thing in the historical reality itself and decided here and now the inevitable experience in the absolute responsibility and transcended now and here in it. In Tillich' s Theology of History it is clear that a decisive character upon tnrth and the inevitability of concrete practice of Theology of history to emphasize inclined to not blindly determinism of a existential philosophy, but combined with a historical condition and a restriction of a concrete decision and with a critical consciousness of an outstripping. Tillich tried to settle with theonomy and heteronomy and their dialect, the concept Kairos which expresses an absolute character and general historical Process which has relativity. Theonomy is a possible historical state as actual Kairos. in which a spiritual social form is filled with an unconditional content as a basis of meaning and all forms. Autonomy became formal and finally emptiness because it deviated from a unity of theonomy. A struggle with theonomy and autonomy is the profound driving force of a creative spiritual process. This is a historical dialectical consideration. which never can be silent. Theonomy is not complete, but a historical inner description of complete. This is not the Kingdom of God. but the image of the fragmentary preoccupied Kingdom of God. Tillich tried to mediate between a unconditional thing and a concrete thing in Theology of History. Namely revelation and salvation are combined with a concrete situation. but at the same time all historical concreteness. which came from the experience of revelation and salvation, is laid under the critic of the protestant principle. By Tillich. it is possible that the experience of a Christian revelation and salvation, as the conquest of an estrangement in existence and an ambiguity in history is proved, when a salvation power of new Being struggles an estrangement and an ambiguity and participates in the strife for the Kingdom of God. The Kingdom of God as symbol of historical existence Tlllict; s has preserved a dual character called immanent transcendence and has endowed the Kingdom of God historically with active dynamics. Tillich demanded, the dynamics of the Kingdom of God should go beyond all concrete actualization and cope with the ambiguity as end of History.