• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.89-89
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• 2012

Arrangement of individual atoms and molecules with atomic precision and understanding the resulting properties at the molecular level are ultimate goals of chemistry, biology, and materials science. For the past three decades, scanning probe microscopy has made strides towards these goals through the direct observation of individual atoms and molecules, enabling the discovery of new and unexpected phenomena. This talk will discuss the origin of forces governing motion of small organic molecules and their extended self-assembly into two-dimensional surface structures by direct observation of individual molecules using scanning tunneling microscopy (STM).

• Journal of Life Science
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• v.3 no.2
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• pp.79-90
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• 1993

The present paper reviews the active natural principles and crude extracts of plants which have been experimentally studied for hyploipidemic activity in the last decades. Phytoconstituents with known structures have been classified in appropriate chemical groups The data are reported on their pharmacological activity, mechanism of action and other properties. This review also describes the inducing method of experimental hypolipidemic animals appeared in the literature.

• The Journal of the Korean dental association
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• v.54 no.10
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• pp.790-798
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• 2016

The maxillofacial soft tissue trauma is one of the major causes to visit the emergency room. For the past few decades, however, the basic concept of the repairing the soft tissue wound have not been changed. Therefore, it could be worthwhile to remind the fundamental concepts and practical information belong to the soft tissue injury management. Among the many types of soft tissue trauma, laceration wound which is most frequently met in the clinic will be discussed in this review.

• Proceedings of the KIEE Conference
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• 1997.07b
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• pp.581-583
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• 1997

For the last two decades, many researchers have interests in orthogonal functions by reason of its applicability on linear system analysis. But they only used integral operation matrix of orthogonal functions to solve the state space equations. Thus, this paper present some new result of differential operation of block-pulse functions from a numerical point of view.

• The Korean Journal of Mycology
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• v.43 no.4
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• pp.207-215
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• 2015

Nanotechnology, which has become an important area of science, has caused an enormous developmental revolution in many fields. In the last two decades researchers have focused on overcoming the obstacles encountered during the preparation of nanoparticles. This article highlights the nanotechnology, along with a brief description of the manufacturing, concepts and activities of nanoparticles as alternative pesticides against plant pathogens, some methods for evaluation of nanoparticles against phytopathogens in vitro and in vivo, and explains the importance of some common nanoparticle types used in agricultural applications and plant pathology.

• Nuclear Engineering and Technology
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• v.38 no.4
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• pp.311-318
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• 2006

Ionizing radiation is a both a natural and man-made phenomena that plays a major role in contemporary applications. The detection of this radiation has evolved over the past several decades from simple observations to precise measurements in space, time, and energy, even in harsh environmental conditions. Tn this paper, we present a snapshot of the current state-of-the-art in radiation measurement technology, highlighting the major applications and detector developments.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.901-902
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• 2006

Powder forging has progressed in three decades through the stages of incubation, growth, and maturity, now accounting for 8% of the $5 B global PM market. In this presentation, a history of the technical development of powder forging will be recounted, from early failed attempts and misconceptions, through seminal academic and industrial research, to technical and commercial success. Discussion covers the contributions of government and industrial funding, fundamental knowledge development, and industrial champions for successful implementation. The focus is on lessons learned that may be beneficial to the transition of other technologies for the powder metallurgy industry.

• Proceedings of the Korean Professional Engineer Association Conference
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• 1995.10a
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• pp.135-143
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• 1995

As a result of impressive economic growth for e past 3 decades Korean rural community saw improvement in road, houses etc. whereas movement of rural population to great urban centers, water pollutions, generation of wastes and damage to rural environment and landscapes emerged as a serious issue. In this treatise the writer reviewed the process of development of rural community under the government initiative and introduced the project for arrangement and restucturing of rural environment and discussed on the directions and requirements for future development.

• Proceedings of the KSR Conference
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• 1998.05a
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• pp.203-210
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• 1998

Rail transport has grown over the Past decades, and rail networks have highly concentrated in urban area, and it is possible for rail passengers to choose a route anions a number of alternative routes. Analysis of factors influencing the choice of route, are required to estimate the rail travel demand of each route. In this paper, we describes route choice model for the transit assignment and characteristics of the route choice(i.e., by relative travel time and fares), and attempts to estimate travel demand of new rail transit based on the slated preference(SP) survey data of Nanko Porttown, which is located in Osaka, Japan.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1998.06a
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• pp.477-480
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• 1998

Sol-gel processing, which started some decades back as a laboratory curiosity, has proved to be a powerful and versatile technique for the synthesis of materials. The utility of the sol-gel method for producing glass and ceramic materials in the form of powders, fibers, thin films and bulk shapes with high purity, functional microstructures and potentially high chemical homogeneity at relatively low temperature (compared to conventional processing) has been discussed.