• Journal of Electrical Engineering and Technology
• /
• v.11 no.3
• /
• pp.543-550
• /
• 2016

The Active Superconducting Current Controller (ASCC) is a new type of Superconducting Fault Current Limiters (SFCL) which can limit the fault current in different modes. It also has the particular abilities of compensating active and reactive powers for electrical networks. In this paper, it is confirmed that the performance of ASCC in different operating modes introduces a limiting impedance in series with the network which can even degrade the transient stability and the operation of the Over-Current Relays (OCR) employed in a power system. In addition, the model of a three-phase ASCC is simulated, and the effect of descriptive modes on the current limiting level is investigated. For the transient stability analysis, a single machine-infinite bus system is tested, and the effect of operation modes is studied based on an equal area criterion obtaining the critical time and the critical angle. Modifying the setting parameters of OCR such as time dial and pick-up current, the protective coordination is also studied in different operating modes.

• The Research Journal of the Costume Culture
• /
• v.11 no.2
• /
• pp.177-192
• /
• 2003

The purpose of this study is to define masculinity as a shilling concept, stemming from the process of power groups controlling the conscious and unconscious of human beings to diffuse their ideologies, and to examine how masculinity has been reflected in aesthetic images in men's bodies and fashion. As for the research methodology, literary research and demonstrative studies through the analysis of pictures and photos were undertaken. Emerging in the wake of the Industrial Revolution in the 19th century, the absolute powers such as the bourgeois elite, males and the Wet emphasized the importance of reason, and made aesthetic images such as authority, robustness and modernization in men's fashion. In the conversion to the Information Society, poweres horizintally spread out over society. By using non-reason, diverse power groups have broken down traditional masculinity and express diverse aesthetic images in men's fashion such as eroticism, multi-culturalism and liberation.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.33 no.6C
• /
• pp.480-486
• /
• 2008

The high peak-to-average power ratio (PAPR) of the transmitted signals is one of major drawbacks of the orthogonal frequency division multiplexing (OFDM). A partial transmit sequences (PTS) technique can improve the PAPR statistics of OFDM signals. However, in a PTS technique, the search complexity to select phase weighting factors increases exponentially with the number of sub-blocks. In this paper, a PTS technique with low computational complexity is presented, which adopts micro-genetic algorithm(${\mu}$-GA) as a search algorithm. A search on the phase weighting factors starts with a population of five randomly generated individuals. An elite having the largest fitness value and the other four individuals selected through the tournament selection strategy are determined, and then the next generation members are generated through the crossover operations among those. If the new generation converges, all the four individuals except the elite are randomly generated again. The search terminates when there has been no improvements on the PAPR during the predefined number of generations, or the maximum number of generations has been reached. To evaluate the performance of the proposed PTS technique, the complementary cumulative distribution functions (CCDF) of the PAPR are compared with those of the conventional PTS techniques.

• Journal of Fisheries and Marine Sciences Education
• /
• v.29 no.2
• /
• pp.537-543
• /
• 2017

The purpose of this research is to investigate the effects of different shoe-cleat position on pedalling performance. Four male elite triathletes(age: $22.00{\times}2.16years$, height: $175.12{\pm}8.06cm$, weight: $71.20{\pm}7.89kg$, body fat: $16.62{\pm}3.56%$) and three female elite triathletes(age: $20.00{\pm}1years$, height: $158.40{\pm}2.42cm$, weight: $51.30{\pm}3.89kg$, body fat: $19.26{\pm}2.28%$) participated in 10km time trial and 30sec time trial pedaling tests with the individual time trials based on different shoe-cleat position(cleat front: CF, cleat back: CB). The subjects performed one trial with each type of shoe-cleat position. Maximal power output and average speed were not significantly different during 30s time trial in CF compared with CB. Average power, RPM, and HR were not significantly different during 10k time trial in CF compared with CB. Split time in 1km, 5km, 9km were significantly reduced during 10k time trial in CB compared with CF. We conclude that there was performance advantage in CB using shoe-cleat back position in comparison with CF using shoe-cleat front position.

• Asia-Pacific Journal of Business
• /
• v.12 no.3
• /
• pp.251-269
• /
• 2021

Purpose & methodology - This study is to answer the following three questions, analyzing data on Top 50 Indian Billionaires, Top 50 Indian companies and Top 50 Indian start-ups. The first is whether or not traiditonal merchant caste like Vaisya's ability of creating wealth declined as some studies argue. The second is whether non-merchant caste like Brahmin, Kshatriya, OBC, Dalit, emerged as an India's new business elite. The third is whether the results of top 50 Indian companies and top 50 start-ups' analyses have similarities with that of top 50 Indian Billionaires analysis. Findings - The result is firstly, the ability of creating wealth of businessmen from the merchant caste was still overwhelming. Secondly, the big businessmen' rising from non-merchant castes as a new business elite was extremely rare. Thirdly, according to the analysis of top 50 Indian start-ups, the percentage of Vaisya has significantly declined while the the percentage of upper castes like Brahmin has noticeably increased. Fourthly, no evidence was found that businessmen from the lower castes like OBC or Dalit were increasing the expanding business influence. Research implications - The Studies mean that in big-sized Indian companies, the power of traditional merchant caste remains the same as before and is even reinforcing, while in small start-ups, Vaisya's power is considerably decreasing, and the upper castes like Brahmin who are highly educated are noticeably increasing.

• Journal of International Area Studies (JIAS)
• /
• v.14 no.1
• /
• pp.77-106
• /
• 2010

As for the matter of guardianship-benefit network which has been at the heart of the discussion of power elites and clan politics in Kazakhstan, it has been often maintained that it is basically formed by the framework of the regional and descent connection net called Zhuz or at least it has been heavily under Zhuz's influence. But it is pointed out that the controversy of Zhuz suffers from a lot of limitations in explaining the surface of power elites in the recent process of political changes and the rearrangement of power relations. Consequently, this paper tried to take a closer look at the matter focusing on the social backgrounds of elites from Junior zhuz, who have been estimated to be relatively pushed back in terms of the advancement into the central power. As a result, it was found that the backgrounds of clan and tribe origin within Zhuz couldn't have any foundation to be seen as a decisive element through which they could grow into power elites. The phenomenon of Kazakhstani elites is a legacy of concrete historic situations. The important consideration points for analyzing the emergence of elites which could be applied to a nomadic and traditional society can hardly be an invariable framework for analyzing modern elites since independence. Since 2000, Kazakhstan has experienced economic changes including privatization due to the absolute strengthening of presidential influence which turned into a foundation for a new authoritarian system, the rearrangement of the inner circle of power, and their decisions. These changes in situations have had profound effects on the character of power elites. The phenomenon that clandestine connections have shown their appearances as they have gotten intertwined with various factors, in particular, in the economic field which has been heavily under Junior zhuz makes us convinced that the elite organization in Kazakhstan has always been the product of political and economic changes. In reality, the behaviors of elites were the outcome continuously reflecting environmental situations surrounding them, and those situations lie in a complicated and multiple-layered connection net. Therefore, it is believed that having interests in elites' social backgrounds and maintaining many pieces of information on them will be able to be a more useful approach to analyzing the elite society in the future in that interests in their social backgrounds become an informant of various network formation nets which reflect real situations.

• Transactions on Electrical and Electronic Materials
• /
• v.18 no.2
• /
• pp.103-110
• /
• 2017

The number of applications of solar photovoltaic (PV) systems in power generation grids has increased in the last decade because of their ability to generate efficient and reliable power in a variety of low installation in domestic applications. Various PV converter topologies have therefore emerged, among which the modular multilevel converter (MMC) is very attractive due to its modularity and transformerless features. The modeling and control of the MMC has become an interesting issue due to the extremely large expansion of PV power plants at the residential scale and due to the power quality requirement of this application. This paper proposes a novel control method of MMC which is used to directly integrate the photovoltaic arrays with the power grid. Traditionally, a closed loop control has been used, although circulating current control and capacitors voltage balancing in each individual leg have remained unsolved problem. In this paper, the integration of model predictive control (MPC) and traditional closed loop control is proposed to control the MMC structure in a PV grid tied mode. Simulation results demonstrate the efficiency and effectiveness of the proposed control model.

• Journal of Power Electronics
• /
• v.14 no.1
• /
• pp.74-81
• /
• 2014

In this study, a brain emotional learning-based intelligent controller (BELBIC) is developed for the speed control of an interior permanent magnet synchronous motor (IPMSM). A novel and simple model of the IPMSM drive structure is established with the intelligent control system, which controls motor speed accurately without the use of any conventional PI controllers and is independent of motor parameters. This study is conducted in both real time and simulation with a new control plant for a laboratory 3 ph, 3.8 Nm IPMSM digital signal processor (DSP)-based drive system. This DSP-based drive system is then compared with conventional BELBIC and an optimized conventional PI controller. Results show that the proposed method performs better than the other controllers and exhibits excellent control characteristics, such as fast response, simple implementation, and robustness with respect to disturbances and manufacturing imperfections.

• Journal of Life Science
• /
• v.22 no.3
• /
• pp.398-406
• /
• 2012

This study aimed to examine whether the polygenic profile of ACE ID and ACTN3 R577X polymorphisms is associated with muscle power performance in Korean athletes. For this study, 106 top-class power athletes (top-class group), 158 elite power athletes (elite-class group), and 676 healthy adults (control) aged 18-39 yrs were recruited and their genotypes were analyzed. The top-class group showed higher frequencies of the II genotype and I allele in ACE, as well as higher frequencies of the RR genotype and R allele in ACTN3 (top-class vs. control: 41.4% vs. 32.1% for II genotype, 67.1% vs. 57.7% for I allele, p<0.05; 42.3% vs. 29.0% for RR genotype, 65.3% vs. 54.8% for I allele, p<0.05). In the polygenic profile, the top-class group had significantly higher frequencies of combined-II/ID+RR/RX genotype than the control group (top-class vs. control: 82.9% vs. 66.7% for II/ID+RR/RX, p<0.05), and there was even a sharp increase in total genotype score (TGS) in this group compared to the elite-class and control groups ($66{\pm}0.9$ vs. $58{\pm}1.9$ vs. $56{\pm}2.3$, p<0.05). The combined-II/ID+RR/RX genotype showed the possibility of succussion in the top-class muscle power performance with an odds ratio of 2.3 (CI:1.4-4.1, p<0.05). These results suggested that ACE and ACTN3 need to interact with each other to affect muscle-power performance in an additive form. Furthermore, the polygenic profile of ACE and ACTN3 can predict muscle performance with high success in a homogeneous dominant combined genotype (II/ID+RR/RX). A further study could identify and combine other genes into ACE and ACTN3 for muscle strength.

• Korean Journal of Applied Biomechanics
• /
• v.24 no.1
• /
• pp.1-9
• /
• 2014

The purpose of this study was to investigate the muscle mechanical properties of the pelvic axial pre-rotational movement for the Jireugi in the Taekwondo Juchumseogi stance. Eleven elite Taekwondo Poomsae athletes participated. Each participant performed 5 right hand Jireugi in Juchumseogi stance as fast and strong as possible while their motion was recorded by a 3D motion analysis system and the ground reaction forces by two force plates. The power and work of the muscular group surrounding the waist were analyzed to verify the effect of the stretch-shortening cycle (SSC) theory. The cause of the greater power seems to be the application of the SSC by the muscles surrounding the waist during the preparation phase of the pre-rotation group. For the none pre-rotation group, they only used the concentric contraction of the muscles surrounding the waist. Because the pre-rotation group used the SSC theory, they had the effect of shortening of the range of movement, creating a fast and more powerful rotation, thus anticipating the increase the magnitude of impact.