Honam University is a university located in Gwangsan-gu, South Korea. Wikipedia.
Kim N.-H.,Honam University
International Journal of Services, Technology and Management | Year: 2017
Due to a sudden increase of data when internet of things, which uses sensor network such as RFID and NFC, was applied, interest in collection, processing, analysis and utilisation of big data is increasing. These big data, which are mostly unstructured data, are showing a great degree of difference in the aspects of data movement speed, variety, speed, and quantity when compared to the existing typical relational data. Especially, as an open source platform, the Hadoop system, which is used for processing of big data that occurs in logistics which is a major utilisation field of internet of things in the technical perspective, is providing opportunities for anyone to build a platform with comparatively lower cost. This thesis attempts to provide data that can be referred to in introducing platform that is adequate to our company by designing various Hadoop platforms that can be utilised in processing big data which occurs in logistics based on IoT and conducting comparative evaluation of its performance. Also, we present the integrated verification results for the data analysis performance of the analysis software system running on top of realised prototypes by employing American Standard Association (ASA) dataset.
Yang H.-Y.,Honam University |
Yang H.-Y.,Regal Beloit |
Lim Y.-C.,Chonnam National University |
Kim H.-C.,Korea Electronic Technology Institute |
Kim H.-C.,Chonnam National University
IEEE Transactions on Industrial Electronics | Year: 2013
This paper presents a single-phase switched reluctance motor (SRM) with skewed stator and rotor so that the acoustic noise and vibration have been significantly reduced. The motor has the same skew angle for both stator and rotor laminations. The main source of acoustic noise and vibration is the rapid change of radial magnetic force along the air gap between the stator and rotor poles. Since the radial force (RF) is most intensified on the stator yoke near the salient poles, the abrupt change of the RF can be mitigated by skewing the stator and/or rotor laminations. Therefore, the RF can be more distributed throughout the stator core, and in turn, the peak value of the RF is reduced. In this paper, the distribution of the RF with respect to the skew angles is analyzed through the finite-element method simulation to design a single-phase SRM with the significantly reduced vibration and noise. Based on the simulation results, prototype motors with three different skew angles (0°, 30°, and 64°) have been constructed and tested, validating that the proposed design is effective in mitigating acoustic noise and vibration. © 1982-2012 IEEE.
Jung I.K.,Honam University
Journal of Nutrition and Health | Year: 2013
Vitamin D defciency (VDD) is becoming an epidemic and thereby a global health problem. Further, VDD adversely affects calcium metabolism and skeletal health, and is associated with increased risk of several diseases, e.g., autoimmune diseases, several types of cancers, type 2 diabetes mellitus, cardiovascular diseases, infectious diseases, asthma, psoriatic arthritis, and etc. To evaluate the prevalence of VDD in Korea, and then to evaluate the association of several factors with serum 25(OH)D level, the author analyzed the data of 14,456 individuals who were 10 years of age and over from the Fifth Korea National Health and Nutrition Examination Survey 1 & 2 (KNHANES V-1 & 2) conducted by the Korean Centers for Disease Control & Prevention. As a result, among Koreans (age ≧ 10years), 65.9% of males and 77.7% of females were below optimum blood serum 25(OH)D (20 ng/mL). VDD is more severe in female than in male at all age groups. In addition, the younger generations had less 25(OH)D level than older generations in Korea. The analysis by complex sample general linear model (CSGLM) suggested that blood 25(OH)D concentration was related with gender (p <.001), residence (p =.030), occupation (p <.001), anemia (p <.001) and physical activity (p <.001). In conclusion, VDD is pandemic and it is more severe in younger generations in Korea. Further, from the results by CSGLM, serum 25(OH)D status is closely related with the life style of Koreans. © 2013 The Korean Nutrition Society.
Lee Y.-W.,Honam University
Neurocomputing | Year: 2013
This paper presents an effective approach to real time hand tracking in dynamic environments of the virtual interactive interview system. Considering simplicity and practical feasibility, we perform hand tracking in the 2D image plane. An interviewer's hand motion recognition algorithm based on the particle filters is applied in this system. The particle filter is well operated for human hand motion recognition more than any other recognition algorithm. Through these experiments, we show that the proposed scheme is stable and works well in virtual interview system's environments. © 2012 Elsevier B.V.
Lee Y.,Honam University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014
This paper suggested the guidance algorithm that enable the unmanned flying objects (UFOs) to track trajectories. It increase the amount of information provided by the measurements and improve overall estimation observability. We assume that small UFOs equipped with camera and navigation sensors are using for improvement of target tracking and an accurate target location estimate. The UFO trajectory optimization is performed for stationary targets and dynamic targets. We considered the Particle Filter for estimation algorithm. The suggested algorithm shows flying object trajectories that increase filter convergence and overall estimation accuracy, illustrating the importance of information-based trajectory design for target localization using small flying objects. © 2014 Springer International Publishing Switzerland.
Sim Y.-S.,Honam University
Proceedings of the 59th Annual Meeting of the International Society for the Systems Sciences | Year: 2015
Living in a globalized society implies that political thinking necessarily extends beyond the national level to reach us in our roles as citizens of the world. Living in today's globalized society also requires a new level of political thinking commensurate with the complexity of its challenges. To overcome the many difficulties we, and the planet we live on, face in the Anthropocene era, it has become incumbent on human beings to practice systems thinking. This paper will examine how general systemic thinking, critical systems thinking, and whole healing systems thinking can help us both comprehend and overcome these challenges. © 2015, International Society for the Systems Sciences (ISSS). All rights reserved.
Chung D.-W.,Honam University
Transactions of the Korean Institute of Electrical Engineers | Year: 2012
This paper is to present a new method of cogging torque reduction for axial flux PM machines of multiple rotor surface mounted magnets. In order to start softly and to run a power generator even the case of weak wind power, reduction of cogging torque is one of the most important issues for a small wind turbine, Cogging torque is an inherent characteristic of PM machines and is caused by the geometry shape of the machine. Several methods have been already applied for reducing the cogging torque of conventional radial flux PM machines. Even though some of these techniques can be also applied to axial flux machines, manufacturing cost is especially higher due to the unique construction of the axial flux machine stator. Consequently, a simpler and low cost method is proposed to apply on axial flux PM machines. This new method is actually applied to a generator of 1.0kW, 16-poles axial flux surface magnet disc type machine with double-rotor-single-stator for small wind turbine. Design optimization of the adjacent magnet pole-arc which results in minimum cogging torque as well as assessment of the effect on the maximum available torque using 3D Finite Element Analysis (FEA) is investigated in this design. Although the design improvement is intended for small wind turbines, it is also applicable to larger wind turbines.
Kim K.,Honam University
Pediatrics International | Year: 2013
Background The purpose of this study was to examine the association between Internet overuse and aggression. Methods A total of 2336 high school students (boys, 57.5%; girls, 42.5%) in South Korea completed the structured questionnaire. The severity of Internet overuse was evaluated using Young's Internet Addiction Test. Aggression was measured using the Aggression Questionnaire, a modified hostility inventory by Buss and Perry. Results The proportions of boys who were classified as severe addicts and moderate addicts were 2.5% and 53.7%, respectively. For girls, the corresponding proportions were 1.9% and 38.9%, respectively. manova results for univariate analysis showed that sex, duration of Internet use, most-frequently used Internet activities, level of Internet addiction, smoking, alcohol, and caffeine were significantly associated with aggression scores. From multivariate analysis, it was found that smoking, alcohol, and level of Internet addiction were independently associated with all aggressive characteristics. Internet addiction scores were also significantly associated with all aggression scores from simple and multiple linear regression analyses (parameter estimate = 0.54-0.58 for total aggression). Pearson correlation results showed that Internet addiction scores revealed the highest correlation coefficients with aggression among Internet-related factors, age, and sex. Severe Internet-addicted boys showed higher scores in all aggression characteristics than severe Internet-addicted girls, even though it was not statistically significant in every characteristic. However, there was no sex effect on the association between Internet overuse and aggression. Conclusion This study shows that Internet overuse is strongly associated with aggression in adolescents. © 2013 Japan Pediatric Society.
Kweon G.-I.,Honam University
Journal of the Optical Society of Korea | Year: 2010
We have developed mathematically precise image-processing algorithms for extracting rectilinear images from fisheye images as well as digital pan/tilt/zoom technology. Using this technology, vertical lines always appear as vertical lines in the panned and/or tilted images. Furthermore, polygonal panoramic images composed of multiple rectilinear images have been obtained using the developed digital pan/tilt technology.
Choi J.,Honam University
Review of Scientific Instruments | Year: 2010
A frequency and a power of rf excited CO2 laser are stabilized using the photoacoustic effect generated from the laser itself. As the radiation intensity in a laser resonator changed, the pressure of laser medium gas changed due to its photoacoustic effect. A condenser microphone built in the resonator is used to convert delicate variations in the pressure into voltage signals to be used as input signals for lock-in stabilizer. As a result of stabilizing the frequency and power of the laser oscillated from P (20) line, at the apex of gain curve, the relative stability of the optical frequency and the rate of change in laser power are 5.57× 10-8 and 9.3%, respectively. © 2010 American Institute of Physics.