• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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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.

• 아동학회지
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• 제26권5호
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• pp.367-377
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• 2005

Semi-structured in-depth interview method were used to test psycho-social comparison among first time offenders and repeated offenders. Data were analyzed by t-test and chi-square. Differences between first time offenders and repeated offenders were that there were more male offenders than female offenders, and violent and theft offenders were more than sex offenders fraud and traffic offenders; early starters were more repeated offenders than late starters; there were some variables such as runway of home, parents' caring attitude, school drop out and maladjustment affecting in repeated offenses; developmental environment of repeated offenders were more negative than first time offenders. Therefore, intervention and prevention program development of good parenting and schooling and forensic counseling focused on optimal developmental environment is needed.

• 한국물환경학회지
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• 제31권1호
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• pp.67-70
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• 2015

Some data into combined and sanitary sewer system were collected in order to find out the characteristics of discharge from first flush rainfall inflow. The inflow ratios of combined and sanitary sewer system were 0.46 and 0.27 during rains from various survey data. The average inflow ratio 0.31 was appropriate for general application because many watersheds were not classified clearly as combined or sanitary sewage treatment areas. The percentage of first flush loads in the whole BOD load was about 10%. This result was thought some meaningful, comparing with similarity of first flush pollution load contribution previous surveyed by KECO (2004).

• 한국과학교육학회지
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• 제21권5호
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• pp.893-905
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• 2001

Korean students ranked the 3rd out of 32 participating countries in the first cycle of PISA(Programme for International Student Assessment) science field, which assessed 15-years-old students' scientific literacy. PISA developed several variables such as parents' socio-economic status, parents' educational attainment, family wealth, and cultural possession, to investigate the effects of background variables on scientific literacy. On the other hand, motivation and engagement in science study were not given much attention, partly because science was the minor area in the first cycle of PISA. Therefore, PISA Korea developed a series of variables to collect data on students' learning motives and out-of-school activities in science as a national option. The results are as followings. First, Korea was found to be one of the PISA participating countries with the scientific literacy achievement least influenced by parents' socio-economic status, family wealth, and parents' cultural possession. Second, the degree of achievement in scientific literacy according to parents' educational attainment was in a positive correlation, similar to the overall tendency of PISA. Third, the most crucial learning motive for Korean students was their desire to develop scientific thinking abilities or obtain science knowledge. On the other hand, choosing jobs in the field of science or parental expectation was the least important learning motive. In particular, the motive for scientific learning was found to have a positive relationship with the degree of scientific literacy achievement. Therefore, the higher the students achievement, the stronger the motive for scientific learning in order to develop their ability to think scientifically or acquire science knowledge. Fourth, Korean students were shown to participate very little in out-of-school scientific activities other than watching TV programs related to science. Whatever the activities may be, the more actively involved students are in out-of-school scientific activities, the higher their scientific literacy achievement. Fifth, Korean girls were rather passive compared to boys in all areas, including science learning motive and out-of-school scientific activities. The gender difference was especially more pronounced in out-of-school scientific activities with wider gaps in such activities as reading scientific books or articles and visiting science-related web sites.

• Journal of the Korean Data and Information Science Society
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• 제17권2호
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• pp.559-568
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• 2006

In this paper, we develop the noninformative priors for the linear mixed models when the parameter of interest is the ratio of variance components. We developed the first and second order matching priors. We reveal that the one-at-a-time reference prior satisfies the second order matching criterion. It turns out that the two group reference prior satisfies a first order matching criterion, but Jeffreys' prior is not first order matching prior. Some simulation study is performed.

• 인터넷정보학회논문지
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• 제1권2호
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• pp.61-67
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• 2000

인터넷 실시간 방송 시스템 중에서 특히 각광을 받고 있는 카메라 원격조정이 가능한 웹 카메라의 경우 다수의 클라이언트가 웹 카메라의 서버에 접속하여 서비스를 요구하므로 스케줄링 기법이 중요시된다. 그러나 기존의 FIFO(First In First Out) 또는 SDF(Shortest Distance First) 스케줄링 기법을 사용할 경우 서비스 요구에 따른 카메라 이동거리의 최소화와 사용자에 대한 공정성 유지측면은 모두 만족하지 못했다. 본 연구에서 제시하고 있는 2D(2-Dimensional)스케줄링기법을 사용할 경우 FIFO 스케줄링 기법에 비해 카메라의 이동거리가 크게 줄어들었으며, SDF 스케줄링에 비하여 특정 Request의 기아현상이 발생하지 않았다. 따라서 2D스케줄링 기법을 원격 조정 가능한 웹 카메라 시스템에 도입 할 경우, 사용자의 서비스 요구에 따른 카메라 이동 거리의 최소화와 사용자에 대한 공정성을 동시에 만족시켜 주므로 사용자에 대한 요구 만족도와 시스템의 성능을 향상시킬 수 있다.

• 한국안전학회지
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• 제21권5호
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• pp.22-27
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• 2006

Even though the interior of urban transit vehicle has been changed as a preventing measure against fire to make it inflammable, there remains a possibility of fire breaking out in case of gasoline etc being brought in the subway. However, there is also the possibility that in case if fire toxic gas is generated and hot air spreads in carriage it will prove very dangerous for people sitting inside. This is a comparative study where we compare simulation results with model examining the time and direction the fire spreads when it breaks out. Also there is vertical distribution of temperature in carriage where the fire spreads out. This study is about demonstrating how to establish smokeless system in urban vehicle, about its necessity, and about vehicle system restructuring. This study also makes an effort to find more advanced method for efficient fire safety in trains. In existing vehicles, in case of fire, the smoke can't go out when doors are closed and hence it spreads in whole train. Even though the method of using ventilation or exhaust established inside the carriage to throw smoke out is much better than the way of opening end doors in each carriage, this study is trying to do research on second way. Through simulation we see that in second case, even though not as good as the first one, smoke can exit through gates. Even though the first method is better, the second can also be uses to let fire out. We can know that in the first case as the smoke can exit out faster, it provides more safety for people. So this system provides better fire safety condition.

• 대한수학회논문집
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• 제16권4호
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• pp.659-666
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• 2001

The aim of this paper is to derive the analytical so-lution of the queue: H$_{r}$/M/c/k/N for machine interference with balking and reneging, and FIFO (first in, first out) service disci-pline.e.

• 한국항행학회논문지
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• 제10권1호
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• pp.70-78
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• 2006

본 논문은 RFC2963에서 제안된 single rate Rate adaptive Shaper (srRAS)를 설계한 것이다. srRAS는 RFC2693에서 제안된 하향의 single rate Three Color Marker (srTCM)과 함께 사용된 쉐이퍼이다. 그것은 가변 속도로 출력되는 tail-drop FIFO (First Input First Out) 큐이다. srTCM은 srRAS로부터의 IP 패킷 스트림을 측정한 후 그 패킷을 green, yellow, 또는 red로 마킹해 준다. 이 쉐이퍼는 AF PHB (Per Hop Behavior)를 제공하는 DS (Differentiated Service) 네트워크의 입력에서 사용되도록 제안되었다. 그리고 srRAS는 srTCM의 상향 트래픽의 버스트성을 줄여줄 수 있다. 본 논문은 srRAS의 알고리즘, 구조, 그리고 FPGA 및 관련 기술을 통하여 구현할 수 있는 방안을 언급하였다.

• 한국인터넷방송통신학회논문지
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• 제15권6호
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• pp.141-146
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• 2015

다양하게 복합된 소리 및 음성신호를 FPGA의 마이크로 입력받아서 신호를 분류하고 분석하여 이상 신호를 감지할 수 있는 많은 시스템이 있으나, 효율적이며 효과적으로 이상 신호를 감지하는 시스템을 구현하는데 있어서는 많은 문제점들을 가지고 있다. 따라서 이 문제를 해결하고 감지율을 높이기 위하여 본 연구에서 제안된 방법에서는 소리 신호가 입력되는 마이크 센서를 사용하여 FIFO(First-in First-out) 구조에 적용하고, 통계학적으로 분산과 변동계수를 적용한 알고리즘을 기반으로 이상 신호를 효과적으로 분류하고, 효율적으로 감지 여부를 출력하는 시스템을 제안하고 구현하였다. 제안된 알고리즘을 적용한 시스템을 통하여 100회 이상의 실험을 반복한 결과 96.3%의 감지율을 보였다.