• Journal of the Korean Data and Information Science Society
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• 제26권4호
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• pp.907-914
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• 2015

저출산으로 인한 학생수의 감소는 교육 행정 정책에 있어서 매우 많은 변화들을 예고하고 있다. 본 연구는 2032년까지 정확한 학생 (인구) 수를 예측하기 위하여 연령 진급률 혹은 학년 진급률을 이용한 학생 (인구) 수를 추계하는 방법을 제시하는데 목적이 있다. 비례법을 이용한 이동평균비례법과 가중비례이동평균법이 인구추계의 방법으로 제시되었다. 제시된 방법들의 측정오차들에 대한 평균과 표준편차들을 모의실험을 통하여 구하였다. 본 연구에서 제시된 가중비례이동평균법과 이동평균비례법의 예측결과들은 낮게 추정되는 현상이 나타나고 있다. 이를 보완하여 대구 경북 지역의 고등학교 3학년 학생수를 추계하였다.

• 대한전기학회논문지
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• 제36권5호
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• pp.360-366
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• 1987

The design problem of optimal constant PIDM (proportional-integral-derivative and measurable variable) feedback controller for linear time-invariannt systems is investigated with the time-weighted quadratic performance index. Necessary conditions for an optimality of the controller are derived and an algorithm for computing the optimal feedback gain is presented. It is shown via example that the design mithod using the time-weighted quadratic performance index improves the transient responses of the closed-loop system.

• Korean Journal of Mathematics
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• 제30권3호
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• pp.491-502
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• 2022

In this paper we investigate some sufficient conditions to guarantee the existence and uniqueness of Stepanov-like weighted pseudo almost periodic solutions of cellular neural networks on Clifford algebra for non-automomous cellular neural networks with multi-proportional delays. Our analysis is based on the differential inequality techniques and the Banach contraction mapping principle.

• Communications for Statistical Applications and Methods
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• 제18권4호
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• pp.485-493
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• 2011

The proportional likelihood ratio order is an extension of the likelihood ratio order for the non-negative absolutely continuous random variables. In addition, the Lindley distribution has been over looked as a mixture of two exponential distributions due to the popularity of the exponential distribution. In this paper, we first recalled the above concepts and then obtained various properties of the Lindley distribution due to the proportional likelihood ratio order. These results are more general than the likelihood ratio ordering aspects related to this distribution. Finally, we discussed the proportional likelihood ratio ordering in view of the weighted version of the Lindley distribution.

• ETRI Journal
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• 제22권3호
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• pp.1-9
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• 2000

Self-Clocked Fair Queueing (SCFQ) algorithm has been considered as an attractive packet scheduling algorithm because of its implementation simplicity, but it has unbounded delay property in some input traffic conditions. In this paper, we propose a Rate Proportional SCFQ (RP-SCFQ) algorithm which is a rate proportional version of SCFQ. If any fair queueing algorithm can be categorized into the rate proportional class and input is constrained by a leaky bucket, its delay is bounded and the same as that of Weighted Fair Queueing (WFQ) which is known as an optimal fair queueing algorithm. RP-SCFQ calculates the timestamps of packets arriving during the transmission of a packet using the current value of system potential updated at every packet departing instant and uses a starting potential when it updates the system potential. By doing so, RP-SCFQ can have the rate proportional property. RP-SCFQ is appropriate for high-speed packet-switched networks since its implementation complexity is low while it guarantees the bounded delay even in the worst-case input traffic conditions.

• Communications for Statistical Applications and Methods
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• 제19권1호
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• pp.23-32
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• 2012

본 논문은 유한모집단에서 회귀계수추정량의 근사편향과 근사분산을 다루고 있다. 유한모집단에서 고정크기 포함확률비례표본을 추출하고 이 표본에서 조사된 데이터에 기초하여 회귀계수를 일반최소제곱추정량과 가중최소제곱추정량으로 추정할 때 두 추정량의 편향, 분산 그리고 평균제곱오차의 근사식을 유도하였다. 그리고 두 추정량의 효율을 비교하기 위하여 두 추정량의 분산을 비교하는 필요충분조건을 제시하였다. 또한 수치적인 비교를 위하여 간단한 예제를 소개하였다.

• Journal of the Korean Data and Information Science Society
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• 제19권2호
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• pp.421-429
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• 2008

We consider a general semiparametric additive risk model that consists of three components. They are parametric, purely and smoothly nonparametric components. In parametric component, time dependent term is known up to proportional constant. In purely nonparametric component, time dependent term is an unknown function, and time dependent term in smoothly nonparametric component is an unknown but smoothly function. As an estimation method of this model, we use the weighted least square estimation by Huffer and McKeague (1991). We provide an illustrative example as well as a simulation study that compares the performance of our method with the ordinary least square method.

• 한국측량학회지
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• 제30권6_2호
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• pp.615-622
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• 2012

Since the accuracy of precipitable/integrated water vapor estimates from GNSS measurements is proportional to the accuracy of water vapor Weighted Mean Temperature Model (WMTM), the WMTM is a significant formulation in the retrieval of precipitable water vapor from zenith wet delay of GNSS signal. The purpose of this paper is to develop available the WMTM to apply for GNSS meteorology in the region of Algeria, by using the Algerian radiosonde network in the World Meteorological Organization (WMO). It can be concluded that the available GNSS precipitable water vapor which is retrieved by the developed Algerian Weighted Mean Temperature Equation (AWMTE) can be useful technique for sensing of water vapor in the Algeria, after Algerian Continuously Operating Reference System (CORS) will be constructed.

• ETRI Journal
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• 제31권4호
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• pp.469-471
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• 2009

This letter proposes a weighted scheduling mechanism for Internet protocol television (IPTV) to improve the loss performance of multicast transmission over an Ethernet passive optical network (EPON). We propose a new weight policy from the number of multicast receivers to proportionally allocate the downstream bandwidth of IPTV traffic. The proposed mechanism is used in an optical line terminal to decrease lost packets of favorite IPTV services because the lost multicast packets are proportional to the number of receivers. The total proportion of lost multicast packets is reduced by up to 73% in an EPON.

• 한국통신학회논문지
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• 제27권6B호
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• pp.586-592
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• 2002

본 논문에서는 이동 접속망에서 발생하는 지연시간을 줄이기 위해 AMC/TDM 무선 데이터 통신에 적합한 새로운 스케줄러 알고리즘을 제안하였다. 새로이 제안된 알고리즘은 비례공정(Proportional fairness) 알고리즘과 M-LWDF(Modified Largest Weighted Delay First) 알고리즘에 기초를 하면서, Xin Liu에 의해 제안된 최소성능보장 알고리즘의 개념을 응용하여 제안되었다. 제안된 알고리즘은 best-effort 서비스뿐만 아니라, QoS 보장서비스에도 적용 가능한 알고리즘으로, 모의실험결과 본 논문에 의해 새로이 제안된 알고리즘을 적용하였을 경우 기존의 비례공정알고리즘이나, M-LWDF알고리즘에 비해 각각 최대 11.5%와 9%의 전송 지연시간을 줄일 수 있었다.