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Search Results: 1 - 10 of 2217 matches for " Dakyo Oh "
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Genetic Variation in the Testis-Specific HASPIN Gene Encoding a Serine/Threonine Protein Kinase in Infertile Japanese Males  [PDF]
Hiromitsu Tanaka, Akira Tsujimura, Yasushi Miyagawa, Dakyo Oh, Damin Choi, Morimasa Wada, Hiromi Nishimura, Yoshitake Nishimune
Advances in Sexual Medicine (ASM) , 2016, DOI: 10.4236/asm.2016.63003
Abstract: HASPIN is a serine/threonine protein kinase predominantly expressed during spermatogenesis and localized in the nucleus. The HASPIN gene is conserved from yeast to mammals and plants. To investigate any possible associations between HASPIN polymorphisms and impaired spermatogenesis in Japanese males, we screened for mutations in the HASPIN coding sequence (CDS) using DNA from 282 sterile male patients and 262 fertile male volunteers. Polymorphisms were found at 10 positions within the HASPIN CDS. Among these 10 polymorphisms, 5 were found only in the infertile group, 3 of which were nonsynonymous. These polymorphisms found only in the infertile patients may be a cause of male infertility and thus valuable candidates for further study of this condition.
Modelling Non-Stationary Wind Speed For Renewablwe Energy Systems Control
C. Nichita,D.Luca,B. Dakyo,E. Ceanga
Annals of Dunarea de Jos , 2001,
Abstract: This paper deals with the modelling of the wind speed, treated as a non-stationary process. In the proposed modelling methods, the wind speed has two components: a long and medium term-component, described by an available spectral characteristic in the low frequency range, and a non-stationary turbulence component, which is “attached” to the medium and long-term component. Two procedures for turbulence component generation, using some shaping filters, are proposed. In both methods turbulence component proprieties are determined depending on current mean value of the medium and long-term component. Numerical results and comment concerning the implementation aspects are also presented
Preservice Teachers’ Sense of Efficacy and Its Sources  [PDF]
Sunjin Oh
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.23037
Abstract: The purpose of this study was to examine several potential sources of preservice teachers’ perceptions of their teaching efficacy during their reading and writing lessons. More specifically, the study explored the relationship between the sources of preservice teachers’ self-efficacy and teachers’ perception of efficacy in the areas of instructional strategies, classroom management, and student engagement. Forty-three preservice teachers in pre-literacy methods courses and fourteen in post-literacy methods courses completed the survey, which consisted of the Teacher Sense of Efficacy Scale (TSES) and Teaching Efficacy Sources Inventory. Paired t-test results showed that preservice teachers’ teaching efficacy increased in the three subscales of instructional strategies, classroom management, and student engagement by the end of the literacy method courses. Efficacy for instructional strategies, classroom management, and student engagement were highly intercorrelated with each other in the pre-test data. The results of multiple regression analysis indicated that personality characteristics, capabilities, motivation, enactive mastery experiences with social/verbal persuasion, and physiological/affective state were significant predictors when efficacy for classroom management was the dependent variable in the post-test data. Findings of this study revealed that preservice teachers’ personality, motivation, and capabilities were one of the important sources to improve their teaching efficacy, in congruence with previous research (Poulou, 2007; Yeung & Watkins, 2000).
Inclusion and Argument Properties for Certain Subclasses of Analytic Functions Defined by Using on Extended Multiplier Transformations  [PDF]
Oh Sang Kwon
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14034
Abstract: Making use of a multiplier transformation, which is defined by means of the Hadamard product (or convolution), we introduce some new subclasses of analytic functions and investigate their inclusion relationships and argument properties.
Some Properties of Analytic Functions with the Fixed Second Coefficients  [PDF]
Oh Sang Kwon
Advances in Pure Mathematics (APM) , 2014, DOI: 10.4236/apm.2014.45025

In this paper, we investigate some argument properties for analytic functions with fixed second coefficient and positive real part. And we apply the argument properties to the functions that are analytic and normalized. In particular, the order of strongly starlikeness of strongly convex functions with fixed second coefficients is given.

New Adaptive Compensator Robust to Memoryless Nonlinear Distortion  [PDF]
Oh Sang Kwon
Intelligent Information Management (IIM) , 2014, DOI: 10.4236/iim.2014.61002

In this paper, the new hybrid adaptive Volterra filter was proposed to be applied for compensating the nonlinear distortion of memoryless nonlinear systems with saturation characteristics. Through computer simulations as well as the analytical analysis, it could be shown that it is possible for both conventional Volterra filter and proposed Volterra filter, to be applied for linearizing the memoryless nonlinear system with nonlinear distortion. Also, the simulation results demonstrated that the proposed Volterra filter may have faster convergence speed and better capability of compensating the nonlinear distortion than the conventional Volterra filter.

Structural Analysis of Factors Influencing the Adjustment Behaviors of Korean Children in the U.S  [PDF]
Sunjin Oh, Mack C. Shelley
Psychology (PSYCH) , 2010, DOI: 10.4236/psych.2010.15048
Abstract: The purpose of this study was to identify factors influencing the adjustment of Korean children who live in the U.S. Specifically, this study examined the following predictor variables: English proficiency, peer relationships, family relationships, and school experiences. Forty seven Korean children who were attending the Korean Language School and their parents participated in this study. Pearson product moment correlations indicated that there was a statistically significant relationship between the adjustment of Korean children who live in the U.S. and their English proficiency, peer relationships, and school experiences. There was no statistically significant relationship between the adjustment of Korean children who live in the U.S. and their family relationships. Additionally, structural equation modeling (SEM) was examined to explore how English proficiency, family relationships, peer relationships, and school experiences may serve as influential factors for adjustment of Korean children who live in the U.S. The resulting model had a good fit, χ2 = 2.02, χ2/df = 1.01, comparative fit index (CFI) = 1.00, root mean square error of approximation (RMSEA) = 0.02, which is small enough to indicate a good fit, and indicated that Korean children’s school experiences had the strongest relationship with their overall adjustment score (β = .73, p < .001). However, the effects of English proficiency and family relationships on adjustment were mediated through school experiences, although it is important to note that English proficiency did not have a positive relationship with school experience (β = -.38, p = .340), but Korean children’s school experiences were positively associated with their English proficiency (β = .68, p < .05).
Concept Analysis: Family Resilience  [PDF]
Seieun Oh, Sun Ju Chang
Open Journal of Nursing (OJN) , 2014, DOI: 10.4236/ojn.2014.413105
Abstract: Background: Although the concept of family resilience has had increased popularity in recent studies, conceptual and methodological issues need to be addressed. Aim: The purpose of this paper is to analyze the current status of the concept of family resilience in research and to suggest future needed directions for research. Methods: The structure of the analysis derives from Rodgers’ evolutionary concept analysis. Data for the analysis were retrieved using six electronic databases through phrasal search with “family resilience” as search terms. 38 were included in the current review. Results: Six dimensions of family resilience were identified: 1) collective confidence; 2) interconnectedness; 3) positive life view; 4) resourcefulness; 5) open communication patterns; and 6) collaborative problem-solving. Three possible antecedents of family resilience were identified: 1) perceived sense of disequilibrium; 2) spirituality/shared belief systems or religious beliefs; and 3) families’ strong will to overcome adversities. Consequences of being resilient include: 1) acceptance of the situation; 2) change in life perspectives; 3) enhanced relationship qualities; 4) reinforcement of resilient properties; and 5) improved health-related outcomes. Conclusion: Although the concept of resilience has been adopted as a useful strength-based perspective to understand family adaptation in the presence of adversity, it still needs further conceptual and methodological refinements. Multiple dimensions, cultural differences and variations of the concept within longitudinal designs should be examined with data gathered from multiple family members in order to improve family resilience research and its application to nursing practice. Implications for future research and intervention are suggested.
A Scalable Multi-Target Tracking Algorithm for Wireless Sensor Networks
Songhwai Oh
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/938521
Abstract: Multi-target tracking is a representative real-time application of sensor networks as it exhibits different aspects of sensor networks such as event detection, sensor information fusion, multihop communication, sensor management, and real-time decision making. The task of tracking multiple objects in a wireless sensor network is challenging due to constraints on a sensor node such as short communication and sensing ranges, a limited amount of memory, and limited computational power. In addition, since a sensor network surveillance system needs to operate autonomously without human operators, it requires an autonomous real-time tracking algorithm which can track an unknown number of targets. In this paper, we develop a scalable real-time multi-target tracking algorithm that is autonomous and robust against transmission failures, communication delays, and sensor localization error. The algorithm is based on a rigorous probabilistic model and an approximation scheme for the optimal Bayesian filter. In particular, an extensive simulation study shows that there is no performance loss up to an average localization error of 0.7 times the separation between sensors and the algorithm tolerates up to 50% lost-to-total packet ratio and 90% delayed-to-total packet ratio. The proposed algorithm has been successfully applied to real-time multi-target tracking problems using wireless sensor networks.
Xi and Omega baryons in the Skyrme model
Oh, Yongseok
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.75.074002
Abstract: The mass spectrum and magnetic moments of \Xi and \Omega baryon resonances are investigated in the bound state approach of the Skyrme model. The empirical hyperon spectrum shows that several hyperon resonances share a pattern of (approximately) equal mass spacings between the states of same spin but of opposite parity. It is found that this pattern can be explained mostly by the energy difference between the P-wave and S-wave kaons bound to the soliton. Although one cannot exclude the possibility that these states can be described as pion-hyperon resonances, the present approach predicts that \Xi(1620) and \Xi(1690) have J^P = 12^-, while \Xi(1950) has J^P = 12^+. The differences with the quark model predictions for the \Xi and \Omega baryon spectrum are pointed out. Several relations for the masses and magnetic moments of those resonances are also obtained.
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