• Journal of the Korea Society for Simulation
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• v.8 no.4
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• pp.1-8
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• 1999

This paper proposes an ATM switch architecture called Output Queued Batcher-Banyan switch (OQBBS). It consists of a Sorting Module, Expanding Module, and Output Queueing Modules. The principles of channel grouping and output queueing are used to increase the maximum throughput of an ATM switch. One distinctive feature of the OQBBS is that multiple cells can be simultaneously delivered to their desired output. The switch architecture is shown to be modular and easily expandable. The performance of the OQBBS in terms of throughput, cell delays, and cell loss rate under uniform random traffic condition is evaluated by computer simulation. The throughput and the average cell delay are close to the ideal performance behavior of a fully connected output queued crossbar switch. It is also shown that the OQBBS meets the cell loss probability requirement of $10^{-6}$.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.1751-1754
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• 2004

Effects of delay on the discharge time lag and the controllability of weak discharge mode were studied under single cell driving circumstances of ac PDP. It was found that sufficient number of priming particle is necessary for inducing weak discharge in ramp voltage driving. Discharge time lag was reduced dramatically under priming condition. It is speculated that the increasement of strong discharge is related to the reduction of the $Xe^*(^3P_1)$ particles during the after glow.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.727-730
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• 2005

In this paper, we propose a new current sense amplifier for low-voltage, high-speed SRAM. As a supply voltage is reduced, a sensing delay is increased owing to reduced cell read current. It causes a low-speed operation in SRAM. To overcome this problem, we present a new current sense amplifier which consists of the current-mirror type circuit with feedback structure. For demonstration, a 0.8-V, 256-Kb SRAM incorporating the proposed current sense amplifier has been designed with $0.18-{\mu}m$ CMOS technology. The simulation results show 15.6ns of the sensing delay reduction in comparison with a previous current sense amplifier and 11.5ns of the sensing delay reduction in comparison with a voltage sense amplifier.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.30A no.2
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• pp.76-85
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• 1993

This paper describes the design of a technology-independent logic, function, and timing extraction system from SPICE-like network descriptions. Technology-independent extraction mechanism is provided in the form of technology files containing the rules for constructing logic gates and functional blocks. The designed system can be more effectively used in cell-based design by describing the cells to be extracted. Timing extraction is performed by using a linear RC gate delay model which takes interconnection delay into account. Experimental results show that estimated delay is within 10 percents for logic gate circuits when compared with SPICE. Through higher-level design descriptions obtained by extraction, design cycles can be considerably reduces.

• Biomaterials and Biomechanics in Bioengineering
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• v.5 no.1
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• pp.51-64
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• 2020

In this study, the mathematical model that describes blood cell development in the bone marrow (i.e., hematopoiesis) has been studied via the Homotopy Perturbation Method (HPM). The results from the present work compared very well with the numerical solutions from published literature. This work has shown that the HPM is viable for solving delay differential equations born from hematopoiesis problem. The influence of the proliferating cells loss rate, time delay rate and the phase re-entry rate on the population densities of both the proliferating and resting cells were also determined through the underlined procedure.

• Journal of the Korea Society of Computer and Information
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• v.7 no.2
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• pp.101-114
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• 2002

The real multimedia application in wide area communication needs the guaranteed performance of communication service. Therefore, the resource is reserved at the moment of traffic burst and the region of connection admission possibility is widened at the basis of maximum cell rate. This of study shows that the end-to-end traffic delay to the traffic of burst state is guaranteed when the total of maximum transmission rate is higher than link speed by using the region of deterministic delay. The network load rate of connection admission can be improved by the inducement of delay bounds consideration each traffic characteristic to guarantee the end-to-end delay of network from single switch. This suggested buffering system using deterministic service do not give any influence to service quality and can guarantee the bounds of end-to-end delay. And it can also reduce the load of network even if the delay is increased according to the burst traffic characteristic. The above suggested system can be applied effectively to the various kinds of general network specification which admit both real time trafnc service and non-real time traffic service.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.273-276
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• 1998

This paper proposes a new Asynchronous Transfer Mode(ATM) switch architecture for the Broadband ISDN. The proposed switch has the architecture to prohibit the out-of-sequence in shared buffer switch system with being fixed buffer size in the out-buffered large scale ATM Switch System. then in this paper proposes cell resequence algorithm to decrease the out-of-sequence problem. also, we studied the out-of-sequence problem that was occurred by the cell transfer delay and the cell overflow due to the fixed buffer size when cell resequenced and we propose to implement optimal ACFIFO(Address Counter First In First Out) buffer size which has the minimized cell loss.

• Journal of the Korean Institute of Telematics and Electronics C
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• v.36C no.7
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• pp.36-45
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• 1999

In order to control the flow of traffics in ATM networks and optimize the usage of network resources, an efficient control mechanism is necessary to cope with congestion and prevent the degradation of network performance caused by congestion. In this paper, Buffered Leaky Bucket which applies the same control scheme to a variety of traffics requiring the different QoS(Quality of Service) and Neural Networks lead to the effective buffer utilization and QoS enhancement in aspects of cell loss rate and mean transfer delay. And the cell scheduling algorithms such as DWRR and DWEDF for multiplexing the incoming traffics are enhanced to get the better fair delay. The network congestion information from cell scheduler is used to control the predicted traffic loss rate of Neural Leaky Bucket, and token generation rate and buffer threshold are changed by the predicted values. The prediction of traffic loss rate by neural networks can enhance efficiency in controlling the cell loss rate and cell transfer delay of next incoming cells and also be applied for other traffic controlling schemes. Computer simulation results performed for random cell generation and traffic prediction show that QoSs of the various kinds of traffcis are increased.

• The Journal of Korean Obstetrics and Gynecology
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• v.21 no.2
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• pp.27-37
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• 2008

Purpose: This study was conducted to investigate the effects of Ginseng Radix Alba extract solution on the cell cycle regulation, apoptosis of human uterine myoma cells. Methods: Primary cultured human uterine myoma cells were treated with extract solution of Ginseng Radix Alba concentration of 1, 10 and $100mg/m{\ell}$ for 48 hours. We underwent flow cytometry and western blotting for cell cycle and apoptosis related factors. Results: In flow cytometry, a slight promotion of G1 phase in $1mg/m{\ell}$ group had been observed but, simultaneously a delay of G1 phase in 10 and $100mg/m{\ell}$ groups were also observed. The manifestation of cyclin D1 in Ginseng Radix Alba extract solution medicated group increased compared to the control group. The manifestation of Bax controlling apoptosis increased in terms of concentration but Bcl-2 showed no change. Also VEGF increased in terms of concentration. Conclusion: The present study suggests that Ginseng Radix Alba extract solution treatment in human uterine myoma cells induce the delay of cell cycle and apoptosis. These results suggest that Ginseng Radix Alba will be a promising agent for use in therapeutics agents against human uterine myoma.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.7A
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• pp.569-580
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• 2012

In this paper, an enhanced initial ranging algorithm for large-cell coverage fixed wireless communication system is proposed. In typical wireless communication system such as WiBro, because a round-trip delay between a transmitter and a receiver is within one OFDM (Orthogonal Frequency Division Multiplexing) symbol duration, a frequency-domain differential correlation method is generally used. However, the conventional method cannot be applied due to an increase of a maximum time delay in large-cell system. In case of an accumulative differential method, estimation errors can occur because of frequent sign transitions. In this paper, therefore, we propose an algorithm which can estimate a total timing offset in a ranging channel structure for 15 km cell. The proposed method can improve performance by sign comparison based sign error correction rule between the estimated values and using a weighting scheme based on channel correlation, the number of accumulations, and the noise reduction effect in normalization process. Also, it can estimate the integer timing offset of symbol duration by comparing peak-powers after compensating for the fractional timing offset of symbol duration.