• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.9
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• pp.1949-1956
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• 1997

The mode parameters of asymmetrical coupled microstrip lines on composite substrates are derived by using closed form expression. A 10 dB directional couplers, where the center frquency is 1.8 GHZ, are fabricated on a single-layer substrate and on compsite substrates respectively. It is shown that coupler on a single-layer substrate.

• Computers and Concrete
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• v.11 no.6
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• pp.571-585
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• 2013

Asymmetrical reinforcement for circular sections in wall piles is an efficient construction component with reduced embodied energy. It has been proven that asymmetrical reinforced wall piles may save more than 50% of the reinforcement than the traditional symmetrically reinforced circular sections. The use of this new type of structural member increases the number of variables in the design problem, which makes its use by engineers more complicated. In order to facilitate the use of the asymmetrically reinforced piles, this paper presents a criterion for the design of this type of structural member. The chosen criterion has been analyzed with the help of flexural capacity-cost curves. The new criterion is similar to the design procedure traditionally used for RC beams.

• English Language & Literature Teaching
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• v.15 no.2
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• pp.51-70
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• 2009

This study focuses on the asymmetrical realization of homorganic nasal-obstruent stop clusters in English when they occur word medially and word finally. This uneven realization of NC clusters is not only controlled by the place of articulation of the cluster constituents but also by the agreement of voicing feature specifications of the cluster elements. We propose context-sensitive constraints, which are more specified versions than *NC (Pater, 1996, 1999, 2004). The result of the study reveals that homorganic NC clusters consisting of coronal place feature are faithfully realized word finally while they are constrained word medially. The deletion of voiceless post-nasal coronal stop should be considered a new language specific strategy to avoid *NC.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.3 no.1
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• pp.223-228
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• 1999

A five-level VSI(Voltage Source Inverter) is introduced as a SVC(Static Vu Compensator) like a large scale power source. The problems in using SVC are that the power device can easily be destroyed by voltage unbalance and accurate reactive power control is difficult because of voltage variation. A asymmetrical PAM(Pulse Amplitude Modulation) switching pattern is proposed to solve this problem and analyze both fundamental component and harmonic current in the system. Through experimental results of 3.5 kVA experimental test system, It is confirmed that DC capacitor voltage can be controlled by asymmetrical PAM switching pattern control.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.11
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• pp.1663-1668
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• 1993

An X-band contiguous band diplexer is realized by using asymmetrical coupled microstrip lines. The design is based on the singly terminated low pass prototype filter and optimized by using SuperCompack. The designed channel 1 and channel 2 bandwidth is 22%, and 18% respectively, where the center frequency is 9,11 GHz. The measured results of the fabricated diplexer are in good agreement with the designed ones, but the measured insertion loss is slightly highier(0.5dB) than those of the designed value.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.38 no.3
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• pp.173-181
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• 1989

A split-phase induction motor with asymmetrical magnetizing reactance axes develops starting torque and its efficiency can be high under certain conditions. In this paper, one method of producing the asymmetry of magnetizing reactance axes is described. The grain-oriented silicon steel core is used to produce the asymmetric axes instead of non-oriented silicon steel core which is used in general motors. The optimum design method for the motor is suggested and analyzed. To verify this suggestion, the permanent capacitor run type induction motors are designed to be driven at balanced condition by its asymmetrical effect, and then the oscillating torque due to the asymmetry of motor structures are analyzed. Tests of the sample motor have shown good performance comparable to ordinary types. This motor structure can be used where high effciency and reliability are required, and also the amount of core materials can be reduced due to its high permeability.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.40 no.12
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• pp.1230-1241
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• 1991

Asymmetrical pulse width modulated(APWM) control technique for AC chopper is proposed which can improve the input power factor. The ideal switching function for the proposed technique is derived and its optimal slope to maintain the input power factor to unity is calculated. By digital simulation several characteristics are investigated theoretically and then compared with those of the conventional PWM and the phase angle control technique. In order to maintain the input power factor to unity the optimal slope and the average value of the ideal switching function are calculated. The experimental results show a good agreement with the calculated ones, which proves the feasibility of the proposed technique.

• Proceedings of the KIEE Conference
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• summer
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• pp.1151-1153
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• 2004

In this paper, small-signal modeling and closed-loop performance of charge control employed to an asymmetrical half-bridge (ASHB) dc-to-dc converters are investigated. The charge control is selected as an alternative to the conventional voltage-mode control and peak current-mode (PCM) control, which have their respective limitations and problems when adapted to ASHB dc-to-dc converters. The current-loop dynamics of the charge control are presented in comparison with those of voltage-mode and PCM control. This paper demonstrates that the charge control offers better dynamic performance compared to voltage-mode control and superior noise characteristics compared to PCM control. The potential problem of charge control are also addressed.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.323-324
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• 2015

Recently, asymmetrical cascaded H-bridge multilevel inverter started to be highlighted as an alternative for the symmetrical cascaded H-bridge. The topology has a small number of part count compared to the symmetrical with higher number of levels. However, it has a drawback of the modulation index limitation which is relatively higher than its symmetrical counterpart, which causes a necessity of an extra voltage pre-regulator. In this paper, the single-sourced pre-regulator is unified with an inner single switch DC/DC converter isolated by coupled inductor. It leads to cost and size reduction. The proposed topology is verified using simulation results.

• Journal of Contemporary Eastern Asia
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• v.20 no.2
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• pp.197-209
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• 2021

This article deals with the asymmetrical relations between Australia and China and explores their interdependence, tensions, and societal outlooks. Both countries are dependent on one another for trade to different degrees but attempt to diversify their supply chains. While there is no united position on China in Australia, there has been a bipartisan support for the counter-interference legislation there. The newly established security pact of the United States (US), the United Kingdom (UK) and Australia - 'AUKUS' - has brought a new dimension into these tensions and will most likely lead to an arms race. The author explores how a so-called middle power such as Australia balances the related economic and strategic interests and priorities. Although Australia has been vulnerable in its asymmetric relationship with China, it has shown that it is not a passive and helpless actor when facing an economic coercion. The interdependence has become a moderating factor in this strategic stand-off. Additionally, Australia demonstrates its tendency to reinforce its traditional reliance on its previous more powerful allies, the UK and the US.