• Journal of IKEEE
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• v.14 no.1
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• pp.40-46
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• 2010

This paper describes a clock and data recovery (CDR) circuit that supports dual data rates of 2.7Gbps and 1.62Gbps for DisplayPort standard. The proposed CDR has a dual mode voltage-controlled oscillator (VCO) that changes the operating frequency with a "Mode" switch control. The chip has been implemented using $0.18{\mu}m$ CMOS process. Measured results show the circuit exhibits peak-to-peak jitters of 37ps(@2.7Gbps) and 27ps(@1.62Gbps) in the recovered data. The power dissipation is 80mW at 2.7Gbps rate from a 1.8V supply.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.337-340
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• 2001

In this paper, we propose two types of dual-mode voltage controlled oscillators (VCO) for PCS/IMT-2000 applications. One is a VCO with controllable resonant circuit. The other type is a VCO with single output and two independent parts

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.2
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• pp.610-628
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• 2012

Dual carrier frequency offsets (CFOs) occur in multiple-input single-output (MISO)-mode DVB-T2 systems, where signals are transmitted simultaneously from two distributed transmitters in a single frequency network (SFN). In this paper, we first derive an optimal compensation frequency for dual CFOs. We also propose an algorithm that optimizes the compensation frequency for the MISO-mode DVB-T2 application. Its performance is compared with the conventional scheme by using a full DVB-T2 simulator.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.10
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• pp.622-624
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• 2014

In this letter, the joint mode selection and resource allocation method is proposed for D2D communication underlaying OFDMA based cellular networks. In the proposed scheme, D2D mode possible region is determined which satisfies QoS. Then we solve the optimization problem utilizing primal-dual algorithm. The proposed scheme shows better performance than conventional schemes.

• Journal of Navigation and Port Research
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• v.34 no.2
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• pp.137-144
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• 2010

In light of the growing traffic congestion problem and congestion cost, the container transport by railway has to be increased. The freight transport by railway can have decided advantages over trucks in terms of energy efficiency, emissions and cost for certain freight movements, just as transportation in the metropolitan region can have great advantages over driving truck. But the freight transport by truck should gain significant mobility benefits from a freight railway system. Thus, the DMT(Dual Mode Trailer) transport system which is coupled railway transport advantages with load transport advantages has been developed and used in the european countries. The DMT transport will therefore serve the areas required by transport organizers. The purpose of this paper is to estimate economical feasibility analysis for development of DMT transport system. Consequently, this study analyzed the characteristics of the DMT system. The horizontal load.unload system is being considered as an adoptable DMT system in consideration of the situation in Korea.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.2
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• pp.321-325
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• 2001

In this paper, we propose two types of dual-mode voltage cont.oiled oscillators (VCO) for PCS/IMT-2000 applications. One is a VCO with controllable resonant circuit. The other type is a VCO with single output and two independent parts.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.10
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• pp.2620-2633
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• 1996

In this paper, a new high-speed local area network using a dual mode switching access (DMSA) protocol implemented on a dual unidirectional bus is described. By utilizing the implicit positionalordering of stations on a unidirectional bus, the proposed system switches between random access mode and the token access model withoug unnecessary delay. Therefore, unlike other hybrid systems such as Buzz-net and Z-net, DMSA does not show a rapid degradation in performance as the load increases. We obtain the average channel utilization and the average access delay by using a simplified analytic model. The numerical results obtained via analysis are compared to the simulation resuls for a partial validation of the approximate model. The performance characteristics of DMSA are superior delay-throughput characteristics at light and medium loads, compared to compared to other LAN systems, and the capability of providing a single active station with full capabity of the channel.

• ETRI Journal
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• v.33 no.5
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• pp.810-813
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• 2011

We report the use of a widely tunable detuned dual-mode laser diode (DML) as a compact and portable continuous-wave THz emitter. The wavelength difference between the two lasing modes of this DML can be tuned from 2.4 nm to 9.3 nm by using integrated microheaters. The power difference between these modes is less than 1 dB, and the side-mode suppression ratio is greater than 30 dB over the entire tuning range.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.6B
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• pp.1074-1081
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• 2000

In this paper, in order to speed up the convergence process and improve the steady mean square error simultaneously, we propose the Stop-and-Go Dual Mode Modified Constant Modulus Algorithm(SAG DM MCMA) for adaptive blind channel equalization of high order QAM. The proposed algorithm is a hybrid scheme of the Modified CMA that treat error signals with real and imaginary components of the equalizer output, the concept of dual mode CMA, and Stop-and-Go algorithm. As a result it can prevent blind equalization from converging to incorrect direction and simultaneously operates reliably for tap weight adaptation. We demonstrate via simulation that the proposed algorithm achieves lower steady state mean square error and residual ISI than the conventional algorithms under high order QAM signals and severe channel environment.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.235-236
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• 2015

본 논문에서는 universal line 입력 및 전 부하영역에서 영전압 스위칭(Zero Voltage Switching) 보장을 통한 500kHz 고 주파수 구동의 Dual Mode control LLC 컨버터를 제안한다. 제안 회로는 전 부하영역에서의 ZVS(영전압 스위칭)보장으로 고주파 구동이 가능하여 전원회로의 부피 중 상당량을 차지하는 수동소자의 부피를 대폭 저감 할 수 있다. 또한, 소용량 전원회로는 PFC(Power Factor Correction)의 규제가 없기 때문에 universal line 입력에 대응이 가능해야하므로, 제안회로는 변화하는 입력전압과 출력전류에 따라 PFM과 PWM의 두 가지 모드로 동작하여 universal line 입력 및 전 부하 영역에서 정확한 출력전압 제어가 가능하다. 최종적으로 제안 회로의 타당성 검증을 위하여 60W급 adapter의 전원회로를 위한 시작품을 제작하여 고찰된 실험 결과를 제시한다.