• 전기학회논문지
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• 제61권7호
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• pp.1019-1023
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• 2012

This paper considers a model predictive control problem of discrete-time constrained systems with time-varying delay. For this problem, a delay dependent state feedback control approach is used to achieve asymptotic stabilization of systems with input constraints. Based on Lyapunov stability theory, a new stability condition is obtained via linear matrix inequality formulation to find cost monotonicity condition of the model predictive control algorithm which guarantee the closed loop stability. Finally, the proposed method is applied to a numerical example in order to show the effectiveness of our results.

• International Journal of Advanced Culture Technology
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• 제9권2호
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• pp.91-99
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• 2021

In Korea, some pharmaceutical companies and agricultural machine manufacturers associate the length of the credit period with the retailer's order size. This kind of commercial practice is based on the principle of economy of scale from the supplier's point of view and tends to make retailer's order size large enough to qualify a certain credit period break. Also, the credit period allowed by the supplier makes it possible to reduce the retail price expecting that the retailer can earn more profits by the stimulating the customer's demand. Since the retailer's order size is affected by the end customer's demand, it is reasonable to determine the retail price and the order size simultaneously. In this regard, this paper analyzes the retailer's problem who has to decide his sales price and order quantity from a supplier who offers different credit periods depending on his order size. And we show that the retailer's order size large enough to qualify a certain credit period break. Also, it is assumed that the end customer's demand rate is represented by a linear decreasing function of the retail price.

• 한국산학기술학회논문지
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• 제14권4호
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• pp.1683-1689
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• 2013

협상과정을 Markov 확률과정으로 전제하고 확률과정의 상태별 이행확률의 크기가 협상참가자의 사적인 정보에 의하여 결정된다고 가정한다. 예를 들어, 판매자와 구매자의 가격협상의 예에서 협상상대방의 특징-예를 들어, 유보가격-에 대한 정보가 사적인 정보일 때 협상참가자 모두가 수용가능한 가격을 찾는 과정이 이행확률의 크기에 영향을 받고, 결과적으로 협상지연의 정도를 결정함을 보인다. 또한 협상의 참가자가 모두 교대로 제안을 하는 제안과 대응제안의 방법의 협상에서보다 협상참가자중 어느 한 쪽의 일방에서 제안을 하는 방법의 협상에서 협상지연이 더욱 길어짐을 보인다.

• 한국항행학회논문지
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• 제24권6호
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• pp.549-556
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• 2020

이 논문에서는 마코프 프로세스로 모델링되는 전송 오류나 전송 지연이 있는 네트워크 제어 시스템을 위한 제어기 설계 방법들을 제안한다. 마코프 지연을 갖는 제어 시스템을 위한 안정화 조건을 지연 의존적인 리아프노프-크라소프스키 범함수가 증가된 제어 시스템의 리아프노프 함수와 동일한 형태를 갖는다는 점을 이용하여 찾는다. 유도된 안정화 조건으로부터 복잡도를 줄이기 위한 수 개의 제어 설계기 방법을 제안한다. 모의 실험을 통하여 제안된 방법 중 행렬 변수의 탐색 공간을 블록 대각 행렬로 제한하는 제한 부분 공간 방법이 성능과 복잡도 사이에서 가장 좋은 트레이드오프를 제공함을 확인되었다.

• 충청수학회지
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• 제26권4호
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• pp.749-756
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• 2013

In this paper, we consider a diffusive delayed predator-prey model with Beddington-DeAngelis type functional response under homogeneous Neumann boundary conditions, where the discrete time delay covers the period from the birth of immature preys to their maturity. We investigate the global existence of nonnegative solutions and the long-term behavior of the time-dependent solution of the model.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2002년도 춘계학술대회
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• pp.243-247
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• 2002

This paper deals with the problem of determining the buyer's economic lot sizing policy for exponentially deteriorating products under trade credit. Assuming that the supplier's credit terms are already known and the length of delay is a function of the buyer's order size, we formulate the mathematical model and the solution algorithm is developed based on the properties of an optimal solution.

• 전자공학회논문지A
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• 제28A권5호
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• pp.387-397
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• 1991

This paper presents the design and implementation of a performance-driven logic synthesis system that automatically generates circuits satisfying the given timing and fanout constraints in minimal silicon area. After performing technology independent and dependent optimization, the system identifies and resynthesizes the gates with large loading delay due to excessive fanouts to eliminate the critical path. Experimental results for MCNC benchmark circuits show that proposed system generates the circuits with less delay by up to 20%.

• 동의생리병리학회지
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• 제18권1호
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• pp.200-205
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• 2004

Uterine leiomyoma is the most common tumor in the female genital tract. Although the tumor is benign, it is of paramount importance since it often causes profuse menstrual bleeding, pressure symptoms, and infertility. Nevertheless, the etiology and patholphysiology of this abnormality remain poorly understood. The traditional definitive treatment for uterine leiomyomas is hysterectomy and, even today, symptomatic leiomyomas are the leading cause of hysterectomy in Korea. Clearly, the development of a safe, effective, and nonsurgical method of treatment for leiomyoma would be of great benefit to many women. The present study was designed to investigate the effect of Rhubarb on apoptosis in uterine leiomyoma cells. Results demonstrate that Rhubarb inhibited cell growth in dose-dependent manner. Cell growth significantly decreased to 60% of control in the treatment of Rhubarb (300㎍/㎖). Associated with the decreased response, there was a concomitant and significant delay of subG1 8.32% above baseline in the treatment of Rhubarb (300㎍/㎖). The delay of subG1 showed a dose-dependent manner, as evidenced by the flow cytometry. The reduced cellular viability on exposure to Rhubarb may represent the induction of apoptosis, at least in part, as concomitantly evidenced by enhanced DNA fragmentation, PARP cleavage and caspase 9 and decreased pro-caspase 3. In addition, Rhubarb decreased clAP1 expression levels in dose-dependent manner. Talcen together, there results suggest that Rhubarb can produce a potent inhibition effect of apoptosis and implicate the delay of G1 phase in the cell cycle and pathways of caspase 3 and 9 in the mechanism underlying inhibitory apoptosis effect of Rhubarb.

• Steel and Composite Structures
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• 제38권4호
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• pp.447-462
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• 2021

In this work, we consider a problem in the context of thermoelectric materials with memory-dependent derivative for a half space which is assumed to have variable thermal conductivity depending on the temperature. The Lamé's modulii of the half space material is taken as a function of the vertical distance from the surface of the medium. The surface is traction free and subjected to a time dependent thermal shock. The problem was solved by using the Laplace transform method together with the perturbation technique. The obtained results are discussed and compared with the solution when Lamé's modulii are constants. Numerical results are computed and represented graphically for the temperature, displacement and stress distributions. Affectability investigation is performed to explore the thermal impacts of a kernel function and a time-delay parameter that are characteristic of memory dependent derivative heat transfer in the behavior of tissue temperature. The correlations are made with the results obtained in the case of the absence of memory-dependent derivative parameters.

• 감성과학
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• 제11권4호
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• pp.637-644
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• 2008

감성을 인식하고 반응하는 감성컴퓨터를 개발하기 위한 감성인식에 대한 연구가 활발하다. 본 연구는 2차원으로 정의한 감성을 측정하기 위해서 시간에 따른 생리신호의 반응 변수를 정의하고 그 변수로 인한 감성을 구분하고자 하였다. 10명의 대학생에게 16장의 감성을 유발시킬 수 있는 이미지를 제시하였다. 그리고 자율신경계 반응으로 ECG(electrocardiogram), PPG(photoplethysmogram), GSR(Galvanic skin response), RSP (respiration), 그리고 SKT(skin temperature)를 측정하였다. 본 연구는 자율신경계 반응에 대해 Delay, Activation, Half recovery 그리고 Full recovery로 이루어진 TDP(Time Dependent Parameters)를 정의하고 감성을 구분할 수 있는지에 대한 통계적 유의성을 검증하였다. 그 결과, TDP가 감성을 구분할 수 있는 유의미한 변수로 확인하였고 특징적 경향을 보임을 알 수 있었다. 그러므로 본 연구는 TDP가 감성 인식을 위한 유효한 변수일 가능성을 보였다.