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Search Results: 1 - 10 of 21533 matches for " Kwang Soon Kim "
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Cooperative Hybrid ARQ Protocols: Unified Frameworks for Protocol Analysis
Ilmu Byun,Kwang Soon Kim
Mathematics , 2008,
Abstract: Cooperative hybrid-ARQ (HARQ) protocols, which can exploit the spatial and temporal diversities, have been widely studied. The efficiency of cooperative HARQ protocols is higher than that of cooperative protocols, because retransmissions are only performed when necessary. We classify cooperative HARQ protocols as three decode-and-forward based HARQ (DF-HARQ) protocols and two amplified-and-forward based (AF-HARQ) protocols. To compare these protocols and obtain the optimum parameters, two unified frameworks are developed for protocol analysis. Using the frameworks, we can evaluate and compare the maximum throughput and outage probabilities according to the SNR, the relay location, and the delay constraint for the protocols.
Acidic pH shock induces the expressions of a wide range of stress-response genes
Yoon Kim, Myung Moon, Jae Song, Colin P Smith, Soon-Kwang Hong, Yong Chang
BMC Genomics , 2008, DOI: 10.1186/1471-2164-9-604
Abstract: According to the results of transcriptional and proteomic analyses, the major number of sigma factor genes were upregulated by an acidic pH shock. Well-studied sigma factor genes of sigH (heat shock), sigR (oxidative stress), sigB (osmotic shock), and hrdD that play a major role in the secondary metabolism, were all strongly upregulated by the pH shock. A number of heat shock proteins including the DnaK family and chaperones such as GroEL2 were also observed to be upregulated by the pH shock, while their repressor of hspR was strongly downregulated. Oxidative stress-related proteins such as thioredoxin, catalase, superoxide dismutase, peroxidase, and osmotic shock-related protein such as vesicle synthases were also upregulated in overall.From these observations, an acidic pH shock was considered to be one of the strongest stresses to influence a wide range of sigma factors and shock-related proteins including general stress response proteins. The upregulation of the sigma factors and shock proteins already found to be related to actinorhodin biosynthesis was considered to have contributed to enhanced actinorhodin productivity by mediating the pH shock signal to regulators or biosynthesis genes for actinorhodin production.Various environmental signals are known to enhance secondary metabolites production in Streptomycetes by initiating complex signal transduction system [1]. There have been a number of studies on the application of an environmental stimulus for the enhancement of productivity. These environmental stimuli include heat shock, cold shock, oxidative stress, osmotic stress, acidic sock, alkali shock [2-6].It is known that different sigma factors respond to different types of stresses, respectively in Streptomyces strains, which have a number of unique signal transduction mechanisms depending on the types of environmental shock [1]. Those sigma factors coordinate gene expression in response to various environmental and endogenous signals.A research group h
Generalized Cross-correlation Properties of Chu Sequences
Jae Won Kang,Younghoon Whang,Hyo Yol Park,Kwang Soon Kim
Mathematics , 2008,
Abstract: In this paper, we analyze the cross-correlation properties for Chu sequences, which provide information on the distribution of the maximum magnitudes of the cross-correlation function. Furthermore, we can obtain the number of available sequences for a given maximum magnitude of the cross-correlation function and the sequence length.
The Minor Spliceosomal Protein U11/U12-31K Is an RNA Chaperone Crucial for U12 Intron Splicing and the Development of Dicot and Monocot Plants
Kyung Jin Kwak, Hyun Ju Jung, Kwang Ho Lee, Young Soon Kim, Won Yong Kim, Sung Ju Ahn, Hunseung Kang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0043707
Abstract: U12 intron-specific spliceosomes contain U11 and U12 small nuclear ribonucleoproteins and mediate the removal of U12 introns from precursor-mRNAs. Among the several proteins unique to the U12-type spliceosomes, an Arabidopsis thaliana AtU11/U12-31K protein has been shown to be indispensible for proper U12 intron splicing and for normal growth and development of Arabidopsis plants. Here, we assessed the functional roles of the rice (Oryza sativa) OsU11/U12-31K protein in U12 intron splicing and development of plants. The U11/U12-31K transcripts were abundantly expressed in the shoot apical meristems (SAMs) of Arabidopsis and rice. Ectopic expression of OsU11/U12-31K in AtU11/U12-31K-defecient Arabidopsis mutant complemented the incorrect U12 intron splicing and abnormal development phenotypes of the Arabidopsis mutant plants. Impaired cell division activity in the SAMs and inflorescence stems observed in the AtU11/U12-31K-deficient mutant was completely recovered to normal by the expression of OsU11/U12-31K. Similar to Arabidopsis AtU11/U12-31K, rice OsU11/U12-31K was determined to harbor RNA chaperone activity. Collectively, the present findings provide evidence for the emerging idea that the U11/U12-31K protein is an indispensible RNA chaperone that functions in U12 intron splicing and is necessary for normal development of monocotyledonous plants as well as dicotyledonous plants.
The Aesthetic Turn in Everyday Life in Korea  [PDF]
Kwang Myung Kim
Open Journal of Philosophy (OJPP) , 2013, DOI: 10.4236/ojpp.2013.33054
Abstract: We are living in the transitional age from the rational, analytical, and scientific to the cultural, sensitive, and aesthetic. The aesthetics of everyday life lies at the center of this age. There is no boundary between art and life in contemporary art. Almost all the contents and objects of everyday life became a work of art in the condition of searching for the aesthetic. Since aesthetic theory was shifted from the artist-centered or a work of art-centered to the audience, spectator or beholder-centered, art and everyday life were more closely related to each other. So aesthetic attention or attitude is not specific to art, but pervasive broadly in everyday life. We can embrace the aesthetic concerns in everything we make and use every day. In the long tradition of Korean art, it can be seen that aesthetic consciousness is steeped in day-to-day life as well as the arts. I want to consider the problems of everydayness, Korean aesthetic consciousness in daily life, and contemplation in the aesthetic consciousness. Korean art was characterized by its “lack of refinement” and “nonchalance”. The characteristics of Korean art as the qualities of “technique without technique”, “Planning without plan”, “asymmetrical symmetry” have dominated the everyday consciousness of Korean people as well as Korean art. The extension of aesthetic emotion through experimentation shows us the change of aesthetic consciousness as a new possibility of interpretation. We stand in an urgent situation of the need for a new theory of art. It will be related to the future of aesthetics. For this reason, I think we have to consider the meaning of the aesthetic turn in everyday life.
Problems of Expressiveness in Geoaesthetics  [PDF]
Kwang Myun Kim
Open Journal of Philosophy (OJPP) , 2014, DOI: 10.4236/ojpp.2014.44061
Abstract: Facing in the prospect of geo-environmental activities like volcanic explosions, earthquakes, floods, landslides, subsidence issues, tsunamis, etc., we have to reconsider a sustainable harmony between human beings and nature. Approaching the reality of the changing patterns of the earth’s surface and geological processes geoaesthetically will be helpful in establishing a more desirable relationship between human beings and nature. In this paper the author attempts to consider the meaning of expressiveness in relation to geoaesthetics, and further the author intends to reveal expressiveness through various phenomena of the earth. Expressiveness can evoke emotion as one experiences the aesthetic object. Empathy plays a role in drawing expression from expressiveness. One can find geoaesthetic expression through looking deeply into the expressiveness the earth presents. Earth itself is inanimate, but owing to its plentiful expressiveness it can restore the organic, animate world.
Problems and Prospects of Geoaesthetics  [PDF]
Kwang Myung Kim
Open Journal of Philosophy (OJPP) , 2015, DOI: 10.4236/ojpp.2015.51001
Abstract: Geoaesthetics is the project of making aesthetic sense of nature through geological phenomena. The aesthetic appreciation of nature has recently become urgent because of the serious influence of the natural environment on human beings. The author’s geoaesthetical research is categorized into three problems: art in geology or geology in the arts as the close relationship between art and geology, geological cognition of nature and natural cognition in environmental aesthetics, and the geoaesthetical approach through works of art. Geologic forces and processes have become significant materials for aesthetic sensations. Based on the geoaesthetic perspective, the author explores the ultimate purpose of art as a return to natural order. It seems partly to be related to the ontological problem of art. Here we can feel earthly dynamics, universal calmness, and the contemplative atmosphere simultaneously.
Semi-slant Riemannian maps
Kwang-Soon Park
Mathematics , 2012,
Abstract: As a generalization of slant submersions (Sahin, 2011), semi-slant submersions (Park and Prasad), and slant Riemannian maps (Sahin), we define the notion of semi-slant Riemannian maps from almost Hermitian manifolds to Riemannian manifolds. We study the integrability of distributions, the geometry of fibers, the harmonicity of such maps, etc. We also find a condition for such maps to be totally geodesic and investigate some decomposition theorems. Moreover, we give examples.
Almost h-semi-slant Riemannian maps
Kwang-Soon Park
Mathematics , 2012,
Abstract: As a generalization of slant Riemannian maps (Sahin), semi-slant Riemannian maps (Park), almost h-slant submersions (Park 2012), and almost h-semi-slant submersions (Park 2011), we introduce the notion of almost h-semi-slant Riemannian maps from almost quaternionic Hermitian manifolds to Riemannian manifolds. We investigate the integrability of distributions, the harmonicity of such maps, the geometry of fibers, etc. We also deal with the condition for such maps to be totally geodesic and study some decomposition theorems. Moreover, we give some examples.
Pointwise almost h-semi-slant submanifolds
Kwang-Soon Park
Mathematics , 2013,
Abstract: We introduce the notions of pointwise almost h-slant submanifolds and pointwise almost h-semi-slant submanifolds as a generalization of slant submanifolds, pointwise slant submanifolds, semi-slant submanifolds, and pointwise semi-slant submanifolds. We have characterizations and investigate the integrability of distributions, the conditions for such distributions to be totally geodesic foliations, the mean curvature vector fields on totally umbilic submanifolds, the properties of h-slant functions and h-semi-slant functions, the properties of non-trivial warped product proper pointwise h-semi-slant submanifolds. We also obtain topological properties on proper pointwise almost h-slant submanifolds and give an inequality for the squared norm of the second fundamental form in terms of the warping function and h-semi-slant functions for a warped product submanifold in a hyperk\"{a}hler manifold. Finally, we give some examples of such submanifolds.
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