• 한국산업융합학회 논문집
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• 제4권1호
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• pp.41-49
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• 2001

This study developed signal optimization algorithm by analyzing vehicle arrival patterns. The major principle of signal optimization is dissipate all queueing vehicle in 1cycle and assign delay time uniformly for all approaches. For this, this study used optimal green time and surplus green time. Optimal green time calculated by estimated traffic volume from vehicle arrival model. Surplus green time defined as the gap of optimal green time and queue dissipated time. And alternative cycle has minimum surplus green time was selected as the optimal cycle. Finally, total delay and average delay per vehicle can be calculated by using queueing theory.

• 한국건축시공학회지
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• 제8권3호
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• pp.111-117
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• 2008

This study provides the setting time prediction method of super retarding concrete incorporating mineral admixtures at the same time including fly ash(FA), blast furnace slag(BS) based on maturity method. The setting time was retarded, as super retarding agent contents increase and curing temperature decreases. In addition, apparent activation energy by Arrhenius function was ranged from $24{\sim}35KJ/mol$ with slightly difference along with mixture proportion. This value is smaller than existing value $30{\sim}50KJ/mol$. It is Indicated that equivalent age using setting time can be a proper method to predict setting time and it also exhibited comparable relativity between prediction value and measurement value. Therefore, this study provided setting time prediction value with super retarding agent contents and mineral admixture combination. Setting time prediction equation provided herein is possibly valid for estimating precise setting time of the super retarding concrete at the job site.

• 대한본초학회지
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• 제26권4호
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• pp.125-132
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• 2011

Objectives : An aim of study is to investigate effects of curculiginis rhizoma in vitro (factor Xa (FXa) inhibitor assay, prothrombinase assay, prothrombin time (PT) assay, activated partial thromboplastin time (aPTT) assay) and in vivo experiment (blood clotting time, thromboxane B2 content assay in serum and weight of thrombus by AV-shunt rat model). Methods : We gained a human serum and used serum in vitro study such as factor X activity (FXa) inhibition, prothrombinase inhibition, prothrombin time (PT) and activated partial thromboplastin time. Fifteen SD rats were divided into three groups (intact control group and two experimental group treated with extract of Curculiginis Rhizoma(ECR)). Rats were orally administrated DW (intact control group), 600 mg/kg concertration of ECR and 200 mg/kg concertration of ECR. After one hour, we anesthetized rats and made arteriovenous (AV) shunt rat models to study weights of thrombus, took a hole blood to study content of thromboxane B2 and blood clotting time. Results : In vitro, ECR increased a inhibitory activity of FXa, prothrombinase and aPTT compared than intact control group. Especially ECR made significant increase of FXa and prothrombinase inhibitory activity (p<0.05, p<0.01). And PT were increased in ECR control group compared with intact control group. In vivo, a blood clotting time of experiment group treated with ECR 600 mg/kg were significantly increased compared with that of intact control group (p<0.05) and content of thromboxane B2 was significantly decreased in group treated with ECR 600 mg/kg in seum. The weight of thrombus were significantly reduced in group treated with ECR 600 mg/kg compared with intact control group (p<0.05). But in vivo experiment study, those of group treated with ECR 200 mg/kg were reduced compared with those of intact control group without statistical significance. Conclusions : ECR has a antithromboic activity in internal course with inhibitory activity of FXa and prothrombinase in vitro, it required to research more study for effective compounds.

• 가족자원경영과 정책
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• 제24권3호
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• pp.19-33
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• 2020

The purpose of this study was to investigate whether paid work time desynchronization affected housework time desynchronization. Time slot data from the Korean Time Use Survey data from 2014 was analyzed. This study included 1,475 married couples aged 20 to 59. They were dual-earner couples, heterosexual couples, and both partners worked during the day, either durong the week or on the weekend. The data was analyzed by the following four groups: weekday-husband, weekday-wife, and weekend-husband, weekend-wife. The results demonstrated that as the desynchronization of paid work increased, the desynchronization of time spent on housework in the weekday-husband and weekend-husband groups also increased. Second, the amount of leisure time did not affect the desynchronization of time spent on housework. Lastly, the amount of time that one person spent on housework increased the housework time desynchronization level. In addition, if the family had children who attended primary, middle, or high school-mothers in the weekday-wife group completed more housework. These results demonstrated that paid work time desynchronization might be a way to decrease the amount of time that dual-earner wives' spent housework.

• 대한토목학회논문집
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• 제31권1D호
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• pp.7-15
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• 2011

통행시간가치는 교통시설 투자사업 시 통행시간 절감효과를 화폐단위로 환산하여 사업의 타당성을 판단하는데 있어 그 중요성이 매우 크다. 또한, 통행시간가치는 도로이용자가 유료도로를 이용할 때의 통행시간단축을 위해 어느 정도의 비용을 지불할 의사가 있는지를 나타내는 지표로서 장래수요예측 시 유료도로의 통행량 예측을 가능하게 한다. 현재 타당성조사 등 수요예측 시에 적용하는 통행시간가치는 기존에 추정한 목적별 시간가치를 이용하여 해당 지역의 전일 통행목적을 업무통행 및 비업무통행으로 구분한 후 이 비율에 따라 수단별 시간가치를 추정하고 있다. 하지만 실제로 시간대에 따라 통행목적의 비율이 상이하기 때문에 시간대별 통행시간가치가 달라짐에도 불구하고 일률적인 통행시간가치를 적용하여 이에 따른 장래 유료도로 이용 패턴 및 편익산정에 왜곡이 발생할 수 있다. 따라서 본 연구에서는 우선 분석시간대를 오전첨두, 오후첨두, 업무시간 비첨두 및 기타 비첨두시간으로 분류한 후 서울시 가구통행실태조사를 이용하여 화물차를 제외한 승용차, 버스 이용자의 시간대별 통행목적 비율을 분석하여 이를 이용하여 시간대별 통행시간가치를 추정하였다. 추정한 시간대별 통행시간 가치를 이용하여 서울 도심부에 대한 사례연구를 실시하였고 그 결과 시간대별 시간가치를 적용하였을 때, 기존 값을 적용했을 때에 비해 유료도로 연간수입이 약 25억원이 적게 산정되었고, 통행시간 절감편익 역시 기존 값을 적용했을 때에 비해 약 10억원이 적게 추정되어, 기존 전일평균 시간가치를 적용하였을 때 유료도로 이용과 편익이 과다추정되는 경향이 있다고 판단된다.

• 가족자원경영과 정책
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• 제11권2호
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• pp.111-132
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• 2007

The purposes of this study are to analyze the time use patterns of rice and barley for farm couples. The data used for this study were collected from farm households during the farming seasons (17th to 30th June) and the off-farming seasons (28th November to 11th December) of 2005, using a time diary. The sample for this study consisted of 118 couples, whose principal crops were rice and barley, living in rural area in eight provinces. SPSS Win 12.0 was utilized to analyze the data. The statistical methods used were frequency, percentage and paired t-test. The major findings of this study were as follows. First, the personal care time of wives was shorter than that of husbands, regardless of the fanning period, with the couples showing more personal care time during the off-farming season than during the farming season. Secondly, the total work(paid work plus housework) time of wives was longer than that of husbands during both the farming season and the off-farming season, showing that the labor burden of wives was bigger than that of husbands. Compared to the farming season, the total work time for both husbands and wives was shorter during the off-farming season, due to reduced farm work time, but the housework time increased for both husbands and wives. Thirdly, the leisure time of husbands was longer than that of wives during both seasons. The leisure time increased for both husbands and wives during the off-farming season, but the portion of the increase was bigger for husbands than for wives.

• 대한인간공학회지
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• 제32권3호
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• pp.217-227
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• 2013

Objective: The purpose of this study was to analyze 'response time', 'peak response time' and 'overshoot value' for each muscle by applying the EMG signal to the vehicle response in ISO 7401 and to quantify the response of the driver according to vehicle characteristics by comparing vehicle characteristics and muscle responses of the driver. Background: The Open-loop test defined in international standards ISO 7401 is the only method for evaluating the performance of the vehicle. However, this test was focused only on mechanical responses, not driver's ones. Method: One skilled male driver(22 yrs. experience) was participated in this experiment to measure muscle activities of the driver in transient state. Then the seven muscle signals were applied to calculate 'response time', 'peak response time', and 'overshoot value'. Results: In the analyses of the EMG data, the effects of vehicle type and muscle were statistically significant on the 'response time' and 'peak response time'. Also, the effects of vehicle type, muscle, and lateral acceleration level were statistically significant on the 'overshoot value' in this study. According to the analyses of the vehicle motion data, vehicle motion variable(LatAcc, Roll, YawVel) was statistically significant on the 'response time' and vehicle type, vehicle motion variable, and lateral acceleration level were statistically significant on the 'peak response time', respectively. Conclusion: In the analyses of the 'response time' and 'overshoot value', the data of muscle activities(EMGs) was better index that could evaluate the vehicle characteristic and performance than the data of vehicle motion. In case of peak response time, both EMG and vehicle motion data were good index. Application: The EMGs data from a driver might be applicable as index for evaluation of various vehicle performances based on this study.

• 대한전기학회논문지:시스템및제어부문D
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• 제52권11호
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• pp.644-649
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• 2003

This study develops an analytical model for the delay analysis of real-time data in the token-passing service of Foundation Fieldbus(FF). Using the analytical model, this study proposes a network design scheme of FF Two design criteria are introduced in this study; one is the average delay of real-time data, and the other is the maximum allowable delay of real-time data. The network design scheme determines the network parameters that satisfies the performance requirements given by these design criteria.

• 산업공학
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• 제11권2호
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• pp.191-197
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• 1998

Having a reliable standard time data is very important for productivity improvement of any manufacturing company. In this study we present an estimation procedure of standard time data for companies having multi-item extremely small quantity production type and discuss a case study. Included in the discussion are the importance of setup time reduction and the roles of management supervisors, and labor.

• 한국콘텐츠학회논문지
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• 제7권10호
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• pp.126-134
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• 2007

애니메이션과 영화와 연극의 시간과 공간에 대해 많은 연구는 이루어져 왔다. 그러나 본 연구는 애니메이션의 시간성과 공간성에 대한 구조주의적 언어학을 기반으로 시도되는 새로운 방법적 고찰이다. 애니메이션 시간성과 공간성에 대해 최소 단위적 연구는 선례가 없다. 연구의 방법론은 구조주의 언어학의 개념을 기반으로 시간성의 개념과 공간성의 개념을 파악하기 위하여, 시간과 공간에 대해 계열적, 통합적 분석을 한다. 이를 위하여 시간의 최소단위와 공간의 최소단위를 정의하고 이에 따라 계열적 분석과 통합적 분석을 시행한다. 본 연구를 통해 애니메이션학의 연구 방법의 다양성을 재고하고 연구의 체계적 심화를 가져올 수 있다. 연구결과는 구조주의적 연구방법론을 통해 애니메이션의 시간성과 공간성에 대한 새로운 연구의 방법을 제시하였다. 향후 과제는 본 연구를 바탕으로 애니메이션의 캐릭터에 대한 연구가 수행된다.