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Search Results: 1 - 10 of 32207 matches for " Young Soo Lee "
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Probability Control for Verification of an Event Report Using Fuzzy System  [PDF]
Hyun Woo Lee, Soo Young Moon, Tae Ho Cho
Wireless Sensor Network (WSN) , 2011, DOI: 10.4236/wsn.2011.312043
Abstract: Sensor networks include numerous sensor nodes that are vulnerable to physical attacks from the outside because they operate in open environments. The sensor nodes are compromised by an attacker. The compromised nodes generate false reports and inject the reports into sensor networks. The false report injection attacks deplete energy of the sensor nodes. Ye et al. proposed Statistical En-Route Filtering (SEF) to defend sensor nodes against the false report injection attacks. In SEF, sensor nodes verify the event reports based on a fixed probability. Thus, the verification energy of a node is the same whether the report is false or valid. But when there are few false reports, energy for verifying legitimate reports may be wasted. In this paper, we propose a method in which each node controls a probability of attempts at verification of an event report to reduce the wasted energy. The probability is determined through consideration of the number of neighboring nodes, the number of hops from the node to the sink node, and the rate of false reports among the 10 most recent event reports forwarded to a node. We simulated our proposed method to prove its energy efficiency. After the simulation, we confirmed that the proposed method is more efficient than SEF for saving sensor node’s energy.
Factors associated with obesity among Korean adolescents  [PDF]
Gyu Jin Heo, So Young Nam, Soo-Kyung Lee
Health (Health) , 2013, DOI: 10.4236/health.2013.58180

Obesity has been a great interest of public health. Studies simultaneously examining various factors associated with obesity among adolescents have been limited. Therefore, this study aimed to examine how various factors (socio-economic status, sex, age, diet, and physical activity) were simultaneously associated with obesity among Korean adolescents. This study analyzed two nationally representative datasets: 2008 Korea National Health and Nutrition Examination and Survey (KNHANES) and 2008 Korea Youth Risk Behavior Web-based Survey (KYRBWS). A total of 900 adolescents (12-18 year-old) in KNHANES and 74,451 adolescents in KYRBWS were included in statistical analyses with SPSS 19.0. Overweight (5.7%) and obesity (13.9%) rates were determined in KNHANES, and KYRBWS showed somewhat lower rates. No significant associations between the various factors and obesity were found in KNHANES. However, the analysis of KYRBWS confirmed higher obesity risk for boys, lower economic status, inferquent high-energy/low-nutrient type food consumption, practicing moderate-intensity physical activity less than five days per week, spending more than 2 hours sitting per day, and having tried exercise or diet for weight control (p < 0.05). The results from the two national datasets seemed to generally agree that many of the various obesity risk factors were important among Korean adolescents, although the associations were mostly not significant in KNHANES. It seemed that obese adolescents tried to practice good dietary behaviors, but not necessarily physical activity, known to reduce obesity risk. Obesity policies should continue to help adolescents achieve an active lifestyle and healthy eating behaviors.

The associations between socioeconomic status and obesity in Korean children from 1998 to 2009  [PDF]
So-Young Nam, Soo-Kyung Lee
Health (Health) , 2013, DOI: 10.4236/health.2013.511256

Increasing interests have been shown in associations between socioeconomic status (SES) and obesity in relation to health inequality. The research objectives were 1) to examine associations between SES and child obesity (including overweight) in Korea over 10 years and 2) to explore possible underlying mechanisms of relationships between SES and obesity. This study used the nationally representative data (KNHA-NES) from 1998, 2005, to 2009. Children (10-18 year-old) were grouped by household income (low, middle-low, middle-high and high) adjusted for the number of family members. Z-scores of height, weight, and BMI for each child were calculated from measured anthropometric data using the 2007 Korean national growth charts. No statistically significant associations were found, however, changes in association patterns were noted. The lower SES group showed shorter height as well as lighter weight among Korean children. More research should be conducted to understand the effects of socioeconomic status on child obesity.


Drone Based Wireless Mesh Network for Disaster/Military Environment  [PDF]
Gudi Siva Leela Krishna Chand, Manhee Lee, Soo Young Shin
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.64004
Abstract: In recent years, researches of disseminating wireless network have been conducted for areas without network infrastructure such as disaster situation or military disputes. However, conventional method was to provide a communication infrastructure by floating large aircraft as UAV or hot-air balloon in the high air. Therefore, it was difficult to utilize previous method because it requires a lot of time and cost. But it is possible to save money and time by using a drone which is already used in many areas as a small UAV. In this paper, we design a drone that can provide wireless infrastructure using high speed Wi-Fi. After reaching the target area, the drone can provide Wi-Fi using wireless mesh network and transmit the situation of local area through attached camera. And the transmitted videos can be monitored in the control center or cell phone through application in real time. The proposed scheme provides wireless communication of up to 160 Mbps in a coverage of about 200 m and video transmission with a coverage of about 120 m, respectively.
Korean Atmospheric Environmental Impact Assessment for Thermal Power Plant  [PDF]
Young Soo Lee, Ji Su Bae, Yu Jin Kang, Yu Jin Kang
Journal of Geoscience and Environment Protection (GEP) , 2014, DOI: 10.4236/gep.2014.24004

Korea has adopted Environmental Impact Assessment (hereafter “EIA”) system for more than 3 decades. There are 74 big projects subject to EIA according to (Environmental Impact Assessment Law (No. 10892). For thermal power plant of which output is more than 10 MW, EIA must be done by proponents. To assess impact on atmospheric environment, proponents utilize air dispersion models and to minimize the adverse impact on air quality, state-of-the-art add-on control technology is applied.

Wavefunction Statistics using Scar States
Soo-Young Lee,Stephen C. Creagh
Physics , 2003, DOI: 10.1016/S0003-4916(03)00081-2
Abstract: We describe the statistics of chaotic wavefunctions near periodic orbits using a basis of states which optimise the effect of scarring. These states reflect the underlying structure of stable and unstable manifolds in phase space and provide a natural means of characterising scarring effects in individual wavefunctions as well as their collective statistical properties. In particular, these states may be used to find scarring in regions of the spectrum normally associated with antiscarring and suggest a characterisation of templates for scarred wavefunctions which vary over the spectrum. The results are applied to quantum maps and billiard systems.
CP violating dimuon charge asymmetry in general left-right models
Kang Young Lee,Soo-hyeon Nam
Physics , 2011, DOI: 10.1103/PhysRevD.85.035001
Abstract: The recently measured charge asymmetry of like-sign dimuon events by the D0 collaboration at Tevatron shows the 3.9 \sigma\ deviation from the standard model prediction. In order to solve this mismatch, we investigate the right-handed current contributions to $B_s-\bar{B}_s$ and $B_d-\bar{B}_d$ mixings which are the major source of the like-sign dimuon events in $b \bar{b}$ production in general left-right models without imposing manifest or pseudo-manifest left-right symmetry. We find the allowed region of new physics parameters satisfying the current experimental data.
LHC Phenomenology of Z' and Z" bosons in the SU(4)_L \times U(1)_X little Higgs model
Kang Young Lee,Soo-hyeon Nam
Physics , 2014,
Abstract: We examine direct limits on masses of the extra neutral gauge bosons in the SU(4)_L \times U(1)_X model with a little Higgs mechanism confronted with the LHC data, especially by embedding anomaly-free set of fermions. There exist two extra neutral gauge bosons, calling Z' and Z", in this model. The lower exclusion limit of the mass of the lighter extra neutral gauge boson is about 3 TeV while that of the heavier one 5 TeV. For comparison, we examine the mass limit of Z'_3 boson in the SU(3)_L \times U(1)_X model as well, and discuss the implication of our result in the SU(4)_L \times U(1)_X model with a standard Higgs mechanism. We also discuss the discovery potential of Z' and Z" at the future LHC with the center-of-momentum energy of 14 TeV. Our results can be applicable to the models with regular Higgs mechanism if the same type of fermion family is assigned.
The weighted complexity and the determinant functions of graphs
Dongseok Kim,Young Soo Kwon,Jaeun Lee
Mathematics , 2007,
Abstract: The complexity of a graph can be obtained as a derivative of a variation of the zeta function or a partial derivative of its generalized characteristic polynomial evaluated at a point [\textit{J. Combin. Theory Ser. B}, 74 (1998), pp. 408--410]. A similar result for the weighted complexity of weighted graphs was found using a determinant function [\textit{J. Combin. Theory Ser. B}, 89 (2003), pp. 17--26]. In this paper, we consider the determinant function of two variables and discover a condition that the weighted complexity of a weighted graph is a partial derivative of the determinant function evaluated at a point. Consequently, we simply obtain the previous results and disclose a new formula for the Bartholdi zeta function. We also consider a new weighted complexity, for which the weights of spanning trees are taken as the sum of weights of edges in the tree, and find a similar formula for this new weighted complexity. As an application, we compute the weighted complexities of the product of the complete graphs.
A classification of prime-valent regular Cayley maps on some groups
Dongseok Kim,Young Soo Kwon,Jaeun Lee
Mathematics , 2007,
Abstract: A Cayley map is a 2-cell embedding of a Cayley graph into an orientable surface with the same local orientation induced by a cyclic permutation of generators at each vertex. In this paper, we provide classifications of prime-valent regular Cayley maps on abelian groups, dihedral groups and dicyclic groups. Consequently, we show that all prime-valent regular Cayley maps on dihedral groups are balanced and all prime-valent regular Cayley maps on abelian groups are either balanced or anti-balanced. Furthermore, we prove that there is no prime-valent regular Cayley map on any dicyclic group.
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