• 인지과학
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• 제24권1호
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• pp.71-93
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• 2013

멀티태스킹은 이제 일상이 되었다. 자발적으로 하고 있던 일을 중단하고, 다른 것으로 전환하는 행동이 점점 쉬워지고 잦아지고 있다. 그러나 기존 연구에 따르면 과제전환은 대부분 인지적 비용을 야기시킬 뿐이다. 본 연구에서는 자발적 과제전환으로 인지적 이득을 얻을 수 있는지에 대해서 알아보고자 하였다. 이를 위해서 우선, 실험 1에서는 비슷한 성격의 두 과제를 할 때, 기존 연구와 마찬가지로 과제전환빈도와 수행도에 부적상관관계가 나타남을 확인하였다. 실험 2에서는 과제전환 가능 조건과 불가능 조건을 나누고, 개인의 멀티태스킹 선호도와 미디어 멀티태스킹 지수에 따라 각 과제의 수행도와 주관적 평가가 어떻게 달라지는지를 분석하였다. 실험 결과, 기존의 대부분 연구와 다르게 과제전환에서 항상 손실이 나타나는 것은 아니었다. 특히, 멀티태스킹 선호도가 높은 집단에서는 자발적 과제전환에서의 이득이 더 크게 나타났다. 기존의 과제전환 연구는 주로 손실이 발생하는 이유와, 그것을 줄이는 방법에 집중된 경향이 있었다. 그러나 본 연구는 과제전환 행동에서 발생하는 인지적 손실 뿐만 아니라 이득도 살펴보고자 하였다. 그 결과 참가자내 조건과 과제의 특성에 따라 손실과 이득이 차이 나는 것을 확인하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -2
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• pp.723-726
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• 2000

In this paper, we present an abstract object-oriented plat-form model .suitable for the real-time distributed telecommunication system. The proposed platform is constructed upon the extended version of the real-time, distributed operating system, SROS(Scalable Real-time Operating System), that is developed at ETRI and successfully operated in the ATM switching system for several years. The object-oriented software development and maintenance methodology will resolve the current software crisis in the area of telecommunication and switching systems due to the everlasting maintenance about the huge amount of the existing software and the ever increasing needs for the better and new communication services. In general, an object-oriented software platform realizes the object-oriented methodology and possesses many good aspects like high productivity, better reusability, easy maintenance, et at. The platform is also designed to present the distributed multimedia service in addition to real-time event delivery. Recently, we have been implementing a couple of prototype bated on the proposed platform. Reflecting the evaluation results from these prototypes, the final platform specification will be determined.

• 제어로봇시스템학회논문지
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• 제7권2호
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• pp.117-124
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• 2001

In a SRM drive, the on/off angles of each phase switch should be accurately controlled in order to control to torque and speed in a stable way, The accuracy of the switching angles is dependent upon the resolution of the encoder and the sampling period of the microprocessor. However, as the speed increase, the amount of the switching angle deviation from the preset values is also increased by the sampling period of the microprocessor. Therefore, a low cost encoder suitable for a practical and stable SRM drive is proposed and the control algorithm to provide the switching signals using the simple digital logic circuit is also presented in this paper. It is verified from the experiments that the proposed encoder and logic controller can be a powerful candidate a the practical low cost SRM drive.

• Journal of the Korean Data and Information Science Society
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• 제26권4호
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• pp.997-1006
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• 2015

In industrial quality control, when engineers use VSI control procedure they should consider both required time to signal and switching behaviors together in the case of production process changed. Up to the present, many researchers have studied fixed sampling interval (FSI) chart and variable sampling interval (VSI) chart in the points of average number of samples to signal (ANSS) and average time to signal (ATS). However, ANSS and ATS do not provide any switching information between different sampling intervals of VSI schemes. In this study, performances of two sampling intervals VSI chart and three sampling intervals VSI chart are evaluated and compared. The numerical results show that ANSS and ATS values of two sampling intervals VSI chart and three sampling interval VSI chart are similar regardless the amount of shifts. However, the values of switching behaviors including ANSW are less efficient in three sampling intervals VSI charts than in two sampling intervals VSI chart.

• Journal of the Korean Data and Information Science Society
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• 제28권2호
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• pp.451-459
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• 2017

There are many researches showing that when a process change has occurred, variable sampling intervals (VSI) control chart is better than the fixed sampling interval (FSI) control chart in terms of reducing the required time to signal. When the process engineers use VSI control procedure, frequent switching between different sampling intervals can be a complicating factor. However, average number of samples to signal (ANSS), which is the amount of required samples to signal, and average time to signal (ATS) do not provide any control statistics about switching performances of VSI charts. In this study, we evaluate numerical switching performances of multivariate VSI EWMA chart including average number of switches to signal (ANSW) and average switching rate (ASWR). In addition, numerical study has been carried out to examine how to improve the performance of considered chart with accumulate-combine approach under several different smoothing constant and sample size. In conclusion, process engineers, who want to manage the correlation coefficients of related quality variables, are recommended to make sample size as large and smoothing constant as small as possible under permission of process conditions.

• 경영정보학연구
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• 제7권1호
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• pp.115-136
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• 2005

최근에 인터넷 포털 기업들은 기존 고객을 유지하고 신규고객을 유치하기 위해 이메일 용량 증대를 앞다투어 발표하고 있다. 그러나 이러한 전략이 사이트 이동에 따른 고객 전환비용의 발생 때문에 성공적일지는 확실치 않다. 따라서 그들의 전략이 실효성이 있을지를 알아보기 위하여 본 연구는 용량 증대로 인한 이메일 서비스의 고객 전환의도에 영향을 미치는 직접적 요인들과 상황적 요인들을 검토한다. 연구 결과는 대안의 매력, 전환비용, 고객 만족 모두가 이메일 서비스의 고객 전환의도에 상당한 직접적 영향을 가지는 것으로 나타났다. 또한 대안의 매력은 고객 전환의도에 대한 조절효과가 있는 것으로 나타났으나 전환비용은 어떠한 조절 효과도 보이지 않았다. 결론적으로 인터넷 포탈 기업들의 공격적인 용량 증대 전략은 고객 베이스를 증대할 수 있는 효과를 거둘 가능성이 매우 높아 보인다.

• International Journal of Internet, Broadcasting and Communication
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• 제14권1호
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• pp.105-115
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• 2022

The platform for displaying cars has been changing with the times. From the popularity of paper media to the rise of computer graphics, the improvement of technology has brought more space and possibilities to the automotive industry. Yiming Zhong proposed the workflow of car configurator through Unreal Engine 4 to implement the basic functions of configuration in 2021, according to Yiming Zhong's final presentation, there is still room to improve the realism of graphics and functionality of the car configurator. Therefore, in this paper we propose to upgrade the car shaders and lighting environments according to the real-world physics and add multi-scenes switching function to car configurator. However the multi-scenes switching function also brings a large amount of data, which leads to the problem of display lag. At the end of the paper, we use the level of details(LOD) process to reduce the amount of data for real-time computing in Unreal Engine 4 and the increase of frames per second(FPS) values verifies the feasibility of our optimization solution.

• 전기의세계
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• 제28권11호
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• pp.37-44
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• 1979

This paper deals with the computer program of finding the minimal sum-of-products for a switching function by using the MASK method derived from the characteristics of the Boolean algebra. The approach differs from the previous procedures in that all the prime implicants are determined only by the bit operation and the minimal sum-of-products are obtained by the modified Petrick method in this work. The important features are the relatively small amount of the run time and the less memory capacity to solve a problem, as compared to the previous computer programs.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.209-210
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• 2006

Hierachical Mobile IPv6 (HMIPv6) solves Micro-mobility protocol problem about Handover. Mobility Anchor Point(MAP) helps reducing the handover, but this makes a load on the MAP. Besides the MAP operates this work everytime, and every Nodes. In this paper, we propose the algorithm that reduces the amount of Map working.

• 전력전자학회논문지
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• 제24권4호
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• pp.279-285
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• 2019

This study proposes an enhanced switching pattern that can improve energy transfer efficiency in an active cell-balancing circuit using a multiwinding transformer. This balancing circuit performs cell balancing by transferring energy stored in a specific cell with high energy to another cell containing low energy through a multiwinding transformer. The circuit operates in flyback and buck-boost modes in accordance with the energy transfer path. In the conventional flyback mode, the leakage inductance of the transformer and the stray inductance component of winding can transfer energy to an undesired path during the balancing operation. This case results in cell imbalance during the cell-balancing process, which reduces the energy transfer efficiency. An enhanced switching pattern that can effectively perform cell balancing by minimizing the amount of energy transferred to the nontarget cells due to the leakage inductance components in the flyback mode is proposed. Energy transfer efficiency and balancing speed can be significantly improved using the proposed switching pattern compared with that using the conventional switching pattern. The performance improvements are verified by experiments using a 1 W prototype cell-balancing circuit.