• 한국통계학회:학술대회논문집
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• 한국통계학회 2004년도 학술발표논문집
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• pp.289-294
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• 2004

We consider M/G/1 queue in which the customers are classified into n+1 classes by their impatience time. First, we analyze the model of two types of customers; one is the customer with constant impatience duration k and the other is patient customer. The expected busy period of the server and the limiting distribution of the virtual waiting time process are obtained. Then, the model is generalized to the one in which there are classes of customers according to their impatience duration.

• 한국군사과학기술학회지
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• 제24권4호
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• pp.449-456
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• 2021

Impatience characteristics are an important factor to be considered in the defense field, which is sensitive to time, but there are not many cases applied. In addition, due to the difficulty of analysis that must consider various probabilistic factors (breakdown/maintenance distribution, impatience characteristics, etc.), military decision makers consider only simple data (number of occurrences per year, maintenance time, etc.) Therefore, in this study, a model capable of analyzing the performance of the emergency maintenance system for determining the appropriate size and organization of military and civilian maintenance personnel was presented in consideration of impatience characteristics and probabilistic factors. And through numerical analysis, the appropriate size of the military and civilian emergency maintenance teams was analyzed. This study is significant in that it can improve readiness of operational power and prevent waste of defense budget through efficient operation of the military's emergency maintenance system.

• 대한수학회논문집
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• 제28권2호
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• pp.383-396
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• 2013

We consider an M/PH/1 queue with deterministic impatience time. An exact analytical expression for the stationary distribution of the workload is derived. By modifying the workload process and using Markovian structure of the phase-type distribution for service times, we are able to construct a new Markov process. The stationary distribution of the new Markov process allows us to find the stationary distribution of the workload. By using the stationary distribution of the workload, we obtain performance measures such as the loss probability, the waiting time distribution and the queue size distribution.

• Journal of applied mathematics & informatics
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• 제30권5_6호
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• pp.749-757
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• 2012

We consider the M/PH,G/1 queue with two classes of customers in which class-1 customers have deterministic impatience time and have preemptive priority over class-2 customers who are assumed to be infinitely patient. The service times of class-1 and class-2 customers have a phase-type distribution and a general distribution, respectively. We obtain performance measures of class-2 customers such as the queue length distribution, the waiting time distribution and the sojourn time distribution, by analyzing the busy period of class-1 customers. We also compute the moments of the queue length and the waiting and sojourn times.

• Industrial Engineering and Management Systems
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• 제15권2호
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• pp.123-130
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• 2016

We introduce a queueing system with general arrival stream and exponential service time under the N-policy, where customers may renege during idle period and arrival rates may vary according to the server's status. Probability distributions of the lengths of idle period and busy period are derived using absorbing Markov chain approach and a method to obtain the optimal control policy that minimizes long-run expected operating cost per unit time is provided. Numerical analysis is done to illustrate and characterize the method.

• 산경연구논집
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• 제12권8호
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• pp.33-39
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• 2021

Purpose: The influence of age on time preference is not identified in the usual cross-sectional analysis. This study aims to test whether age affects time preference after controlling for the effects of individual heterogeneity including cohort effects. Research design, data and methodology: Drawing on a nationally representative panel dataset of Indonesians, we estimate the effects of age on time preference after controlling for unobserved individual heterogeneity as well as potential cohort effects. We measure time preference exploiting information on two sets of multiple price lists: one for a one-year delay, and the other for a five-year delay. Results: When we controlled for time-invariant individual characteristics, including birth cohort effects in a fixed effects model, the older men and women were more patient in a linear fashion, particularly when the delay was longer. To highlight the importance of controlling for individual fixed effects, we repeated the specification without controlling for individual fixed effects in OLS or censored maximum likelihood regression; we found no relation between age and impatience in men or women and for a one or five-year delay. Conclusions: The older men and women are more patient, and time preferences are correlated with unobserved individual heterogeneity.

• 한국심리학회지 : 문화 및 사회문제
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• 제18권2호
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• pp.153-167
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• 2012

본 연구는 서두름 행동의 5요인의 특성에 초점을 맞추어, 서두름 행동과 A형 행동의 관계를 바탕으로 서두름 행동의 5요인의 특성을 밝히고자 진행되었다. 이를 위해, 만 18세 이상 59세 이하 성인 207명이 서두름 행동 질문지와 A형 행동 질문지에 응답하였다. A형 행동 질문지는 A형 행동 및 성격을 측정하는 기존 문항을 바탕으로 총 136개 문항을 수집하였다. 그리고 요인분석을 통해 6개 요인으로 이루어진 29개 문항으로 축소되었다. A형 행동의 구성요인으로 성공추구, 인내부족, 실패불안, 과제몰입, 활동성, 민첩성이 나타났다. 서두름 행동요인분석 결과, 서두름 행동은 기존 연구와 동일한 5가지 요인으로 이루어져 있었다. 서두름 행동과 A형 행동의 상관분석 결과, 시간압력에서 나타나는 서두름 행동은 성공추구, 실패불안, 과제몰입, 민첩성과 정적상관을 보였다. 불편함에서 나타나는 서두름 행동과 고립에서 나타나는 서두름 행동은 인내심부족과 정적상관을 보였다. 지루함에서 나타나는 서두름 행동은 성공추구와 활동성 및 민첩성과 정적 상관이 있었다. 보상기대에서 나타나는 서두름 행동은 성공추구, 인내부족, 실패불안, 민첩성과 정적상관을 가지는 것으로 나타났다.

• Asia Marketing Journal
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• 제20권2호
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• pp.29-40
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• 2018

Recent research reported that perception of future time is non-linearly scaled. That is, as objective time gets longer, subjective perception of the objective time does not grow proportionally. The non-linear time perception implies that the same future time feels shorter when it starts in the future than when it starts immediately. The authors call this as a future contraction effect. The current research tests two important implications of the effect regarding consumers' intertemporal preference for durable goods. First, consumers who contract future more will be more impatient for durable goods compared to those who contract less because the former would feel to use the same durable goods longer when it is purchased immediately. Second, consumers' impatience will be alleviated when their tendency to contract future is reduced. The authors find support for these predictions through two studies. Taken together, the current research demonstrates a property of time perception that has important ramifications for understanding consumers' intertemporal preference for durable goods.

• 대한간호학회지
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• 제20권1호
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• pp.79-87
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• 1990

Clinical and epedemiologic studies of coronary heart disease(CHD)have from time to time over the last three decades found associations between prevalence of CHD and behavioral attributes and cigarette smoking. The main purpose of this study is reduced to major risk factor of coronary heart disease through prohibition of smoking and control of behavior pattern. The subjects consisted of 120 smokers and 90 non-smokers who were married men older than 30 years working in officers. The officers were surveyed by means of questionnaire September 26 through October 6, 1989. The Instruments used for this study was a self-administered measurement tool composed of 59 items was made through modifications of Jenkuns Activity Survery(JAS). The Data were analysed by SAS(Statistical Analsis System) program personal computer. The statistical technique used for this study were Frequency, x$^2$-test, t-test, ANOVA, Pearson Correlation Coefficient. The 15 items were chosen with items above 0.3 of the factor loading in the factor analysis. In the first factor analysis 19 factors were extracted and accounted for 86% of the total variance. However when the number of factors were limited to 3 in order to derive Jenkins classification, three factors were derived. There names are Job-Involvement, Speed & Impatience, Hard-Driving. Each of them includes 21 items, 21 and 9, respectively. The results of this study were as follow : 1. The score of the smoker group and non-smoker group in Job-Involvement(t＝5.7147, p＜0.0001), Speed & Impatience(t＝4.6756, p＜.0001), Hard-Driving(t＝8.0822, p＜.0001) and total type A behavior pattern showed statistically significant differences(t＝8.1224, p＜.0001). 2. The score of type A behavior pattern by number of cigarettes smoked daily were not statistically significant differences. 3. The score of type A behavior pattern by duration of smoking were not significant differences. It was concluded that the relationship between smokers and non - smokers of type A behavior pattern was statistically significant difference but number of cigarettes smoked daily and duration of smoking were not significant differences. Therefore this study is needed to adequate nursing intervention of type A behavior pattern in order to elevated to educational effect for prohibition of cigarette smoking.

• 한국심리학회지 : 문화 및 사회문제
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• 제27권2호
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• pp.191-216
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• 2021

자신의 미래 시간을 느끼는 정도는 그 사람의 다양한 행동에 영향을 미친다. 특히 미래를 대비하는 행동인 저축, 혹은 미래에 상관없이 지금 감정에 맞춰 행동하는 충동구매 등 다양한 소비행동이 미래 시간 인식과 맞닿아 있다. 본 연구는 미래 자기 연결성에 초점을 맞춰 현재와 미래의 자기가 이어져 있다고 느끼는 정도가 소셜 미디어에서 제공되는 이미지를 통해 얼마나 변화하는지 살펴보고자했다. 그리고 이 변화를 통해 실제 지연 보상 선택 경향성, 즉 미래의 큰 보상을 위해 현재의 쾌락적 선택을 포기하는 정도가 얼마나 늘어나는지 알아보고자 했다. 또한 이 관계가 노년에 대한 긍정적 지각과 성향적 낙관성에 따라 변화할 지를 측정하였다. 연구 결과, 다양한 나이의 사람들을 SNS를 통해 보여주는 것은 실제 참여자(20대)의 미래 자기 연결성과 소비 선택에서의 인내심을 증가시켰다. 또한 이 관계는 나이 듦에 대한 인식 수준에 따라 변화하였다.