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Search Results: 1 - 10 of 65503 matches for " Chang-Yong Lee "
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Correlations among centrality measures in complex networks
Chang-Yong Lee
Physics , 2006,
Abstract: In this paper, we empirically investigate correlations among four centrality measures, originated from the social science, of various complex networks. For each network, we compute the centrality measures, from which the partial correlation as well as the correlation coefficient among measures is estimated. We uncover that the degree and the betweenness centrality are highly correlated; furthermore, the betweenness follows a power-law distribution irrespective of the type of networks. This characteristic is further examined in terms of the conditional probability distribution of the betweenness, given the degree. The conditional distribution also exhibits a power-law behavior independent of the degree which explains partially, if not whole, the origin of the power-law distribution of the betweenness. A similar analysis on the random network reveals that these characteristics are not found in the random network.
Mass Fractal Dimension of the Ribosome and Implication of its Dynamic Characteristics
Chang-Yong Lee
Quantitative Biology , 2006, DOI: 10.1103/PhysRevE.73.042901
Abstract: Self-similar properties of the ribosome in terms of the mass fractal dimension are investigated. We find that both the 30S subunit and the 16S rRNA have fractal dimensions of 2.58 and 2.82, respectively; while the 50S subunit as well as the 23S rRNA has the mass fractal dimension close to 3, implying a compact three dimensional macromolecule. This finding supports the dynamic and active role of the 30S subunit in the protein synthesis, in contrast to the pass role of the 50S subunit.
An efficient method for solving a correlated multi-item inventory system
Chang-Yong Lee,Dongju Lee
Physics , 2014,
Abstract: We propose an efficient method of finding an optimal solution for a multi-item continuous review inventory model in which a bivariate Gaussian probability distribution represents a correlation between the demands of different items. By utilizing appropriate normalizations of the demands, we show that the normalized demands are uncorrelated. Furthermore, the set of equations coupled with different items can be decoupled in such a way that the order quantity and reorder point for each item can be evaluated independently from those of the other. As a result, in contrast to conventional methods, the solution procedure for the proposed method can be much simpler and more accurate without any approximation. To demonstrate the advantage of the proposed method, we present a solution scheme for a multi-item continuous review inventory model in which the demand of optional components depend on that of a "vanilla box", representing the customer's stochastic demand, under stochastic payment and budget constraints. We also perform a sensitivity analysis to investigate the dependence of order quantities and reorder points on the correlation coefficient.
Projectile $Δ$ Excitations in $p(p,n)Nπ$ Reactions
Yung Jo,Chang-Yong Lee
Physics , 1995, DOI: 10.1103/PhysRevC.54.952
Abstract: It has recently been proven from measurements of the spin-transfer coefficients $D_{xx}$ and $D_{zz}$ that there is a small but non-vanishing $\Delta S=0$ component $\sigma_{0}$, in the inclusive $p(p,n)N\pi\,$ reaction cross section $\sigma\,$. It is shown that the dominant part of the measured $\sigma_{0}$ can be explained in terms of the projectile $\Delta$ excitation mechanism. An estimate is further made of contributions to $\sigma_{0}$ from s-wave rescattering process. It is found that s-wave rescattering contribution is much smaller than the contribution coming from projectile $\Delta$ excitation mechanism. The addition of s-wave rescattering contribution to the dominant part, however, improves the fit to the data.
Statistical Self-Similar Properties of Complex Networks
Chang-Yong Lee,Sunghwan Jung
Physics , 2006, DOI: 10.1103/PhysRevE.73.066102
Abstract: It has been shown that many complex networks shared distinctive features, which differ in many ways from the random and the regular networks. Although these features capture important characteristics of complex networks, their applicability depends on the type of networks. To unravel ubiquitous characteristics that complex networks may have in common, we adopt the clustering coefficient as the probability measure, and present a systematic analysis of various types of complex networks from the perspective of statistical self-similarity. We find that the probability distribution of the clustering coefficient is best characterized by the multifractal; moreover, the support of the measure had a fractal dimension. These two features enable us to describe complex networks in a unified way; at the same time, offer unforeseen possibilities to comprehend complex networks.
Nest Box Preference by Secondary Cavity-Nesting Birds in Forested Environments
Choi, Chang-Yong,Hyun-Young Nam,Eun-Jae Lee,,Ok-Sik Chung
Journal of Ecology and Field Biology , 2007,
Abstract: We placed and monitored 2,137 nest boxes to determine how the size of the entrance hole andthe box placement influenced nest box selection by secondary cavity-nesting birds and to derive recommendationsfor the use of nest boxes for management of cavity-nesting birds in forested environments. A total of566 pairs of seven bird species used the nest boxes from 1997 to 2006, 562 of which were secondarycavity-nesters. Sympatric tits such as varied tits (Parus varius), great tits (P. major), and marsh tits (P. palustris)were common breeding birds in nest boxes, and showed clear preferences for 4.0 cm, 3.5 cm and 3.0 cm nestholes, respectively. Tree sparrows (Passer montanus) and Eurasian nuthatches (Sitta europaea) preferred 4 cmand 3.5 cm holes, respectively. We did not detect selection for the directional orientation for the entrance hole,but the birds appeared to avoid nest boxes that faced steep or gentle upward slopes and those less than 1.8m from the ground. These results are probably related to avoidance of disturbance and predation. We suggestthat diverse species can be supported by the placement of nest boxes with entrance holes of various sizes andthat specific species can be targeted by selecting the hole sizes preferred by those species. To attract secondarycavity-nesters, managers should avoid placing nest boxes close to the ground and facing hills. This study alsosuggests that careful selection and placement of nest boxes is needed to avoid biases in research using nestboxes.
Current trends in the treatment of infantile spasms
Chang-Yong Tsao
Neuropsychiatric Disease and Treatment , 2009, DOI: http://dx.doi.org/10.2147/NDT.S4488
Abstract: rrent trends in the treatment of infantile spasms Review (7372) Total Article Views Authors: Chang-Yong Tsao Published Date May 2009 Volume 2009:5 Pages 289 - 299 DOI: http://dx.doi.org/10.2147/NDT.S4488 Chang-Yong Tsao Clinical Pediatrics and Neurology, The Ohio State University, College of Medicine, Columbus, Ohio, USA Abstract: Infantile spasms are an epilepsy syndrome with distinctive features, including age onset during infancy, characteristic epileptic spasms, and specific electroencephalographic patterns (interictal hypsarrhythmia and ictal voltage suppression). Adrenocorticotropic hormone (ACTH) was first employed to treat infantile spasms in 1958, and since then it has been tried in prospective and retrospective studies for infantile spasms. Oral corticosteroids were also used in a few studies for infantile spasms. Variable success in cessation of infantile spasms and normalization of electroencephalograms was demonstrated. However, frequent significant adverse effects are associated with ACTH and oral corticosteroids. Vigabatrin has been used since the 1990s, and shown to be successful in resolution of infantile spasms, especially for infantile spasms associated with tuberous sclerosis. It is associated with visual field constriction, which is often asymptomatic and requires perimetric visual field study to identify. When ACTH, oral corticosteroids, and vigabatrin fail to induce cessation of infantile spasms, other alternative treatments include valproic acid, nitrazepam, pyridoxine, topiramate, zonisamide, lamotrigine, levetiracetam, felbamate, ganaxolone, liposteroid, thyrotropin-releasing hormone, intravenous immunoglobulin and a ketogenic diet. Rarely, infantile spasms in association with biotinidase deficiency, phenylketonuria, and pyridoxine-dependent seizures are successfully treated with biotin, a low phenylalanine diet, and pyridoxine, respectively. For medically intractable infantile spasms, some properly selected patients may have complete cessation of infantile spasms with appropriate surgical treatments.
Current trends in the treatment of infantile spasms
Chang-Yong Tsao
Neuropsychiatric Disease and Treatment , 2009,
Abstract: Chang-Yong TsaoClinical Pediatrics and Neurology, The Ohio State University, College of Medicine, Columbus, Ohio, USAAbstract: Infantile spasms are an epilepsy syndrome with distinctive features, including age onset during infancy, characteristic epileptic spasms, and specific electroencephalographic patterns (interictal hypsarrhythmia and ictal voltage suppression). Adrenocorticotropic hormone (ACTH) was first employed to treat infantile spasms in 1958, and since then it has been tried in prospective and retrospective studies for infantile spasms. Oral corticosteroids were also used in a few studies for infantile spasms. Variable success in cessation of infantile spasms and normalization of electroencephalograms was demonstrated. However, frequent significant adverse effects are associated with ACTH and oral corticosteroids. Vigabatrin has been used since the 1990s, and shown to be successful in resolution of infantile spasms, especially for infantile spasms associated with tuberous sclerosis. It is associated with visual field constriction, which is often asymptomatic and requires perimetric visual field study to identify. When ACTH, oral corticosteroids, and vigabatrin fail to induce cessation of infantile spasms, other alternative treatments include valproic acid, nitrazepam, pyridoxine, topiramate, zonisamide, lamotrigine, levetiracetam, felbamate, ganaxolone, liposteroid, thyrotropin-releasing hormone, intravenous immunoglobulin and a ketogenic diet. Rarely, infantile spasms in association with biotinidase deficiency, phenylketonuria, and pyridoxine-dependent seizures are successfully treated with biotin, a low phenylalanine diet, and pyridoxine, respectively. For medically intractable infantile spasms, some properly selected patients may have complete cessation of infantile spasms with appropriate surgical treatments.Keywords: infantile spasms, adrenocorticotropic hormone, oral corticosteroids, vigabatrin
A Behavior Analysis-Based Game Bot Detection Approach Considering Various Play Styles
Yeounoh Chung,Chang-yong Park,Noo-ri Kim,Hana Cho,Taebok Yoon,Hunjoo Lee,Jee-Hyong Lee
Computer Science , 2015, DOI: 10.4218/etrij.13.2013.0049
Abstract: An approach for game bot detection in MMORPGs is proposed based on the analysis of game playing behavior. Since MMORPGs are large scale games, users can play in various ways. This variety in playing behavior makes it hard to detect game bots based on play behaviors. In order to cope with this problem, the proposed approach observes game playing behaviors of users and groups them by their behavioral similarities. Then, it develops a local bot detection model for each player group. Since the locally optimized models can more accurately detect game bots within each player group, the combination of those models brings about overall improvement. For a practical purpose of reducing the workloads of the game servers in service, the game data is collected at a low resolution in time. Behavioral features are selected and developed to accurately detect game bots with the low resolution data, considering common aspects of MMORPG playing. Through the experiment with the real data from a game currently in service, it is shown that the proposed local model approach yields more accurate results.
Effect of acetate on lead toxicity to microbial biomass in a red soil
KS Khan,Huang Chang-yong,
K.S. Khan
,Huang Chang-yong

环境科学学报(英文版) , 1999,
Abstract: A laboratory incubation experiment was conducted to elucidate the effect of acetate on lead bioavailability and toxicity to microbial biomass in a red soil. Treatment included the application of lead at six different levels i.e., 0(background), 100, 200, 300, 450 and 600μg/g soil with three levels of the acetate(0, 900 and 2700 μg/g soil). Results indicated that the application of acetate along or at the lower lead levels of 100 and 200μg/g soil stimulated the soil microbial biomass. The addition of acetate at the higher lead levels of 300, 450 and 600 μg/g soil caused significantly greater reductions in the biomass carbon(Cmic) and the biomass nitrogen(Nmic), compared with the control or the same lead levels applied individually. A greater increase in the biomass C:N ratio occurred by acetate addition at the same lead levels. The concentration of 0.01mol/L CaCl2-extractable lead was considerably higher in the lead plus acetate treatments than at the same lead levels with no acetate.Based on these results, it was concluded that the application of acetate might have suppressed the lead adsorption in the soil which in turn resulted in its more bioavailability and hence more toxicity to the soil microbial biomass.
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