• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.507_508
• /
• 2009

As a result of environmental concerns, renewable energy systems are rapidly increasing and particularly tidal current is a potential source of energy. In accordance with a large-capacity trend, doubly-fed induction generator is applied such as wind farms and tidal systems. In this paper, Optimal hysteresis band amplitude of CRPWM Converter is determined for improving rotor current waveform and electrical quality.

• Journal of the Korean Society of Industry Convergence
• /
• v.21 no.4
• /
• pp.149-158
• /
• 2018

With the propagation and spread of the new regeneration energy and increase in electricity demand, power systems tend to be decentralized, and accordingly, the use of a power system stabilizer tends to expand for the stabilization of the distribution system. Thus, typical power system stabilizer, Static Var Compensator (SVC) is developed on a variety of topologies. In addition, the trend of technology leads from SVC to Static Synchronous Compensator(STATCOM) technology development. Recently, to overcome STATCOM's conversion losses and economic disadvantages, studies of a hybrid method using STATCOM and SVC in parallel have actively been conducted. This study proposes a new Soft-Step Switching method to limit inrush current problematic in Thyristor Controlled Capacitor (TCC) method in SVC function. In addition, to reduce Statcom's capacity, groups of reactive power compensation reactor and condenser for SVC were designed.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1999.04a
• /
• pp.223-228
• /
• 1999

The state of the current design practice in designing the so-called hybrid structures with the upper shear-wall and lower frame systems are reviewed through the investigation of the 43 design examples. In particular, the trend in the design of the transfer system between upper wall and lower frame systems are analyzed with respect to the depth, the length and the number of spans of transfer deep girders and the number of upper stories. Finally the most critical portions in this conventional transfer system, which should be studied in depth in the future, are pointed out to improve the current design and analysis practice.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2003.07a
• /
• pp.622-625
• /
• 2003

The dependence of stress-induced leakage current on LTPS TFTs was characterized in this study. The impacts of poly-Si crystallization, gate insulator, impurity activation, hydrogenation process and electrostatic discharge damage were investigated. It was observed more TFTs instable characteristic under those process-assisted processes. According to the LTPS roadmap, smaller geometric and low temperature process were the future trend and the stress-induced leakage current should be worthy of remark.

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.25 no.7
• /
• pp.780-790
• /
• 1988

We have studied the hot-carrier-induced degradation caused by the high channel electric field due to the decrease of the gate length of MOSFET used in VLSI. Under DC stress, the condition in which maximum substrate current occures gave the worst degradation. Under AC dynamic stress, other conditions, the pulse shape and the falling rate, gave enormous effects on the degradation phenomena, especially at 77K. Threshold voltage, transconductance, channel conductance and gate current were measured and compared under various stress conditions. The threshold voltage was almost completely recovered by hot-injection stress as a reverse-stress. But, the transconductance was rapidly degraded under hot-hole injection and recovered by sequential hot-electron stress. The Si-SiO2 interface state density was analyzed by a charge pumping technique and the charge pumping current showed the same trend as the threshold voltage shift in degradation process.

• Journal of the Korean Institute of Telematics and Electronics D
• /
• v.34D no.9
• /
• pp.50-55
• /
• 1997

In order to improve the electrical performance of ITO/InP solar cells, sulfur passivation technique was employed using (N $H_{4}$)$_{2}$ $S_{x}$ solution. Passivation effects were analyzed by measuring the short circuit current density ( $J_{sc}$ ) of solar cells and photoluminescence (PL) of ITO/InP interfaces. This paper firstly reports the sulfur passivation effects by investigating the correlation between the PL intensity and the short circuit current. Generally, PL intensity and the short circuit current of sulfur passivated sampels wer eincreased, and showed the same trend. Especially, samples prepared at 60.deg. C (N $H_{4}$)$_{2}$ $S_{x}$ solution exhibited the highest $J_{sc}$ and PL intensity. These results demonstrated that the short circuit currents was influenced by the ITO/InP interface states.

• Journal of the Korean Society of Costume
• /
• v.54 no.2
• /
• pp.53-65
• /
• 2004

As the contemporary public consensus prefers individuality to classical things, they have gotten sick of the universality and pursue fashion anew. As a result the new concept of artistic value delivers a shock to ordinary and traditional images. The bizarreness culture of fashion contains two extremes, horror and humor. which make people uneasy but amused by sensuous descriptions. Bizarre things captivate the audience regardless of the violent stimuli. The conversion of aesthetic consciousness is brought accordingly by horror and humor. In this paper, It is discussed that the concept of history of bizarreness and the social effect from its phenomena in current fashion are expressed through the two methods above. The bizarreness phenomena in current fashion is shown as a new hybrid type which has been recreated and came out of the internet. This phenomena has caused abnormal results and ironically mixed products, what was once directness, violence and disgust, are on the other hand enjoyment and amusement. A widening field, the bizarreness phenomenon, as an important implication in which can completely change the current trend, will be on track as a crucial concept representing contemporary cultures.

• Cross-Cultural Studies
• /
• v.21
• /
• pp.87-111
• /
• 2010

This research examines the concept of 'homo sovieticus' by reviewing the sociological essay novel homo sovieticus written by Zinoviev who was one of the well-known dissident in Soviet Union period, and attempts to have critical understanding of the concept. It is an interesting research topic that current Russia and Russians who get through the historical layers from Soviet to post-Soviet regime at the time current trend that allows to have various academic discussions of post-Soviet. It is required to examine the past of Russia and Russian to make precise estimation of their current and future. Therefore, it is necessary to re-examine the term of 'homo sovieticus' which is conventionally accepted. This research aims at broad comprehension of homo-sovieticus by focusing on the Zinoviev's own understanding instead of the habitual use of the term which only contains ideological and political intention.

• Food Science and Industry
• /
• v.52 no.3
• /
• pp.241-260
• /
• 2019

Prebiotics are defined as substrates that are selectively utilized by host microorganisms conferring various health benefits. Current prebiotic researches not only focus on non-digestible oligosaccharides, but also extend to polyphenols and peptides. However, the extended scope of prebiotic research pertains its original purposes: promotion of beneficial bacteria in host guts and production of valuable metabolites. Maintenance of optimal gut microflora plays a key role in host health care benefits including anti-cancer activity, immune response modulation, blood lipid level reduction, increased mineral absorption, and weight loss. With increasing probiotics markets, prebiotics have also received much attention in functional food markets. Hence, many global food companies tempt to develop new prebiotics applicable for preventing human diseases as well as modulating immune system. In this review, we discuss current status of prebiotics research, market progress, and future perspectives of prebiotics.

• Proceedings of the KSR Conference
• /
• 2011.10a
• /
• pp.2527-2538
• /
• 2011

The Reliability started for MILitary purposes during World War II in 1942, getting more important for maintenance, safety, etc in modern society. As technologies develop, also international standards for measuring the reliability is advancing. RAMS activities for maintenance, safety verification is material to national railroad. And for this, it needs quick response for the changes of standards. Even now standards are upgrading for developing electronic technologies. Therefore analysis of failure rate's trend about such standards is judged necessary. So We submit a this paper for comparative analysis of changing process standards according to development of electronic technologies and reliability. At first, we compared actual usage ratio of standards for understanding the current state of usage. Based of these state of usage, discuss the major standard. And then, introduced reliability standards's trend, calculation method of failure rate and difference of failure rate calculation standard according to march of time. In this paper, used standards are MIL-HDBK-217F, Telcodia, etc.