• 한국건설관리학회논문집
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• 제6권6호
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• pp.142-151
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• 2005

공공 건설공사에 있어서 발주관청에서 산정한 예정공사기간과 실제 공사기간 사이에 차이가 발생하여 당초 계획했던 프로젝트가 예정준공일보다 지연되는 경우가 빈번하게 발생한다. 이는 공사지연에 따른 시공 중 문제점뿐만 아니라 시설물사용 계획의 차질로 초래되는 물류비용증가, 시민불편가중, 시설물을 이용한 생산 및 공급차질과 이로 인한 각 분야의 막대한 손실 등으로 이어진다. 이러한 손실들을 줄이기 위해서는 발주시 산정하는 예정공사기간의 정확도를 높여야 한다. 본 연구는 발주관청의 예정공사기간 산정시 지표로 활용할 수 있는 공사기간보정요소를 포함하는 예정공사기간 산정모델을 제시하여 적정공사기간을 확보함으로서 시공 중의 공기 연장 빈도를 줄이고 나아가서는 공공 프로젝트의 성공적인 운영에 기여하고자 한다.

• 대한의용생체공학회:의공학회지
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• 제13권2호
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• pp.97-106
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• 1992

The cardiac activation process uslng three dimensional ventricular model is simulated. To study this theme, we constructed a cardiac ventricular model and simulated the cardiac activation process using the action potential duration and the activation time. The cardiac ventricular model is generated by the loglcal combination of the elliptic equations. The action potential duration could be obtained from the fact that It Is linearly distributed between model cells. The cardiac activation process was simulated by the law of "all-or-none". Based on the activation time and the action potential duration the cardiac potential at the arbitrary time after the activation of the model cell was computed. To test the validity of model, the comparison of the results of model simulation with the physiological data was performed. In conclusion, this model shows the simular results which is comparable to the 1 Pal conduction of the cardlac excitation.xcitation.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1992년도 추계학술대회
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• pp.146-149
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• 1992

The cardiac depolarization model using three dimensional ventricular model is simulated. To study this theme, we constructed a cardiac ventricular model and simulated the cardiac activation process using the action potential duration and the activation time. The cardiac potential model is generated by the logical combination of the elliptic equations. The action potential duration could be obtained from the fact that it is linearly distributed between model cells. The cardiac activation process was simulated by the law of "all-or-none". Based on the activation time and the action potential duration the cardiac potential at the arbitrary time after the activation of the model cell was computed. To test the validity of model, the comparison the results of model simulation with the physiological data was performed.

• 음성과학
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• 제15권4호
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• pp.97-105
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• 2008

Nowadays an HMM-based text-to-speech system (HTS) has been very widely studied because it needs less memory and low computation complexity and is suitable for embedded systems in comparison with a corpus-based unit concatenation text-to-speech one. It also has the advantage that voice characteristics and the speaking rate of the synthetic speech can be converted easily by modifying HMM parameters appropriately. We implemented an HMM-based Korean text-to-speech system using a small size Korean speech DB and proposes a method to increase the naturalness of the synthetic speech by controlling duration model parameters in the HMM-based Korean text-to speech system. We performed a paired comparison test to verify that theses techniques are effective. The test result with the preference scores of 73.8% has shown the improvement of the naturalness of the synthetic speech through controlling the duration model parameters.

• Journal of Construction Engineering and Project Management
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• 제4권4호
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• pp.33-40
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• 2014

Maximizing the profitability and minimizing the duration of construction projects in extreme weather regions is a challenging objective that is essential for project success. An optimization model is presented herein for the time-profit trade-off analysis of construction projects under extreme weather conditions. The model generates optimal/near optimal schedules that maximize profit and minimize the duration of construction projects in extreme weather regions. The computations in the model are organized into: (1) a scheduling module that develops practical schedules for construction projects, (2) a profit module that computes project costs (direct, indirect, and total) and project profit, and (3) a multi-objective module that determines optimal/near optimal trade-offs between project duration and profit. One example is used to show the impact of extreme weather on construction time and profit. Another example is used to show the model's ability to generate optimal trade-offs between the time and profit of construction projects under extreme weather conditions.

• 한국정보과학회논문지:소프트웨어및응용
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• 제31권1호
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• pp.20-28
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• 2004

소프트웨어 개발 초기에 개발비용, 소묘인력과 기간을 추정하는 것은 소프트웨어공학 분야의 중요하면서도 어려운 문제이다. 기존 모델은 개발업체의 생산성 수준을 고려하지 않고 단순히 기능점수와 노력, 노력과 개발기간 관계에 대한 회귀분석을 통해 개발노력과 기간을 추정하는 모델을 제시하였다. 그러나 동일한 규모의 소프트웨어라도 개발업체의 생산성 수준에 따라 다른 노력의 양이 투입되며, 동일한 노력이 투입되더라도 생산성에 따라 개발기간이 달라진다. 생산성 수준을 고려하지 않은 제안된 모델들은 실제 개발될 프로젝트 적용에 제한점을 갖고 있다. 본 논문은 기존 모텔의 단점을 보완하기 위해 생산성을 고려하여 개발기간을 추정할 수 있는 모델들을 제안한다. 생산성에 기반 하여 다양한 방법으로 개발기간을 추정할 수 있는 모델을 제안하고 모델들의 성능을 비교하였다. 모델 성능 비교 결과 생산성에 기반 하여 소프트웨어 규모로부터 개발기간을 추정하는 모델이 단순하면서도 가장 좋은 결과를 얻었다. 본 모델은 사업 초기에 프로젝트 관리자에게 소프트웨어 개발 기간 의사결정 정보를 제공한다.

• 한국방재학회 논문집
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• 제5권3호
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• pp.29-39
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• 2005

본 연구는 도시유역인 성내와 반포배수구역과 동의대시험유역에서 수문학적 특성에 따른 임계지속기간의 변화를 구명한 것이다. 유출해석을 위한 도시유출모형으로는 RRL, ILLUDAS, SWMM과 SMADA 모형을 사용하였으며, 수문학적 특성으로는 강우의 시간분포방법, 확률강우강도식, 선행함수조건, 재현기간과 유출모형을 이용하였다. 도시유역에서 최대 첨두유량을 발생시키는 강우의 시간분포방법은 Huff의 4분위로 나타났으며, 첨두유량은 수문학적 특성에 따라 차이를 보였으나 유출모형을 제외한 수문학적 특성들은 임계지속기간에 영향을 미치지 않는 것으로 나타났다. 임계지속기간은 유출모형에 따라 차이를 나타내고 있으며, SWMM 모형에 Huff의 4분위를 적용하였을 경우 임계지속기간이 가장 크게 나타났다.

• 한국물환경학회지
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• 제25권5호
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• pp.792-802
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• 2009

The objective of this study is to construct the watershed management system with link of the non-point sources model and to estimate delivery ratio duration curves for various pollutants. For the total water pollution load management system, non-point source model should be performed with the study of the characteristic about non-point sources and loadings of non-point source and the allotment of pollutant in each area. In this study, daily flow rates and delivered pollutant loads of Nakdong river basin are simulated with modified TANK model and minimum variance unbiased estimator and SWAT model. Based on the simulation results, flow duration curves, load duration curves, and delivery ratio duration curves have been established. Then GIS analysis is performed to obtain several hydrological geomorphic characteristics such as watershed area, stream length, watershed slope and runoff curve number. As a result, the SWAT simulation results show good agreements in terms of discharge, BOD, TN, TP but for more exact simulation should be kept studying about variables and parameters which are needed for simulation. And as a result of the characteristic discharges, pollutants loading with the runoff and delivery ratios, non-point sources effects were higher than point sources effects in the small-scale test bed of Nakdong river basin.

• 대한음성학회:학술대회논문집
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• 대한음성학회 2002년도 11월 학술대회지
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• pp.197-200
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• 2002

In this paper, we propose a phoneme duration modeling in a speech recognition system based on disicion tree state tying. We assume that phone duration has a Gamma distribution. In a training mode, we model mean and variance of each state duration in context-independent phone model based on decision tree state tying. In a recognition mode, we get mean and variance of each context-dependent phone duration form state duration information obtaind during training mode. We make a comparative study of the proposed meth with conventinal methods. Our method results in good performance compared with conventional methods.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.780-785
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• 2005

This paper aims to consider an overall benefit-duration optimization (OBDO) problem for the sake of maximizing owner's economic benefits, whilst considering influences of schedule compression incurred opportunity income on the profitability of a large-scale construction project. Unlike previous schedule optimization models and techniques that have focused on project duration or cost minimization, with greater weight on contractors' interests, OBDO facilitates owner's economic benefits through overall benefit-duration optimization. In this paper, the objective function of OBDO model is formulated. An example is illustrated to prove the feasibility and practicability of the overall benefit-duration optimization problem. The significance of employing OBDO model and future research work are also described.