• 문화기술의 융합
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• 제10권4호
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• pp.285-294
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• 2024

본 연구는 실용음악 교육프로그램을 활용하여 학습자의 창의·융합적 사고를 증진시켜 수월성 높은 작품 활동과 그를 통한 다학문의 융합을 목적으로 한다. 이를 위해 PDIE 모형을 적용한 실용음악 창의·융합 교육프로그램을 설계하였고, 개발된 프로그램의 내용 타당성을 검증하였다. 우리는 이 과정을 통해, 실용음악교육에서 활용 할 수 있는 다학문의 연구 방법에 관해 연구 기술하였는데, 본 논문에서는 4회차에 해당하는 실용음악과 수학의 창의·융합 교육에 관한 연구를 다루었다. 이 연구에서 관심 있게 주목한 수학적 이론은 피보나치수열로 예술의 황금 분활의 비의 근간이 되는 피보나치수열을 학습하고 이를 통하여 균형감 있고 수월성 높은 창작활동을 가능하게 함을 목적으로 한다. 또한 제시된 지도안을 비롯하여 15주차의 수업으로 진행된 본 수업지도안의 타당성 및 효과성을 검증하기 위하여 연구 대상 및 내용 검증에 참여한 연구 참가자들, 연구의 절차, 사용된 연구 도구, 다양한 자료의 수집 및 분석 방법을 구체적으로 정리하였다. 우리는 이를 통하여 실용음악 고등교육안에서의 창의·융합 교육의 가능성을 확인하고 후속 연구를 통하여 다양한 창의적 인재 양성을 위한 교육 방법론을 도모하였다.

• 한국임상약학회지
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• 제18권2호
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• pp.106-113
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• 2008

The aim of this study was to evaluate the bioequivalence of two domperidone preparations. Bioequivalence assessment was conducted on 34 healthy volunteers who received two tablets (Domperidone Maleate, 12.72 mg/tablet) in the fasting state, in a randomized balanced $2{\times}2$ cross-over study design. This whole study was performed according to the implementation guidelines of the Korea Food Drug Administration. After dosing of two tablets, blood samples were collected serially for a period of 36 hours. Plasma was analyzed for domperidone by using LC/MS/MS assay method. The analysis system was validated in specificity, accuracy, precision, and linearity. $AUC_t$, (the area under the plasma concentration-time curve from the zero-time to 36 hr) was calculated through the trapezoidal rule. $C_{max}$ (maximum plasma drug concentration) and $T_{max}$ (time to reach $C_{max}$) were compiled from the plasma domperidone concentration-time data of each volunteer. No significant sequence effect was found for the bioavailability parameters indicating that the cross-over design was properly performed. The 90%-Confidence intervals of the $AUC_t$ ratio and the $C_{max}$ were from log 0.8007 to log 1.1240 and log 0.8645- log 1.2483, respectively. These values were within the acceptable bioequivalence intervals between 0.80 and 1.25. Therefore, this study demonstrated that two formulations have bioequivalence with respect to the rate and extent of absorption.

• 대한토목학회논문집
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• 제32권6D호
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• pp.533-538
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• 2012

교통관리 전략의 우선순위 설정의 목적은 시행단계에서 전략목표를 계획적이고 균형 있게 달성하는 것이다. 조직의 관점 및 전략목표를 도출하고 가중치를 부여하기 위한 방법으로 AHP 기법을 주로 사용한다. 본 연구에서는 국내 특정 교통관리 기관을 대상으로 설문조사방법과 임직원 설문 방식을 활용하여 관점과 전략목표를 도출하였다. 그 후, 관점 및 전략목표의 우선순위를 AHP 기법을 통해 설정하였다. 본 연구를 통해 세 가지 결과를 얻을 수 있었다. 첫째, 국내 특정교통관리기관의 관점에 대한 가중치는 고객, 미래, 활동, 성과의 순서를 나타내었다. 이는 이 기관의 임직원이 고객에 대해 가치 체계를 두고 있음을 보여준다. 둘째, 전략목표 중 고객 중심적 사고의 증대와 친환경가치 체계 확립의 가중치가 가장 높았다. 셋째, 근무지별로 살펴보면 본사와 지역본부는 고객 중심적 사고의 증대를 가장 중요시하였다. 반면 지사는 친환경 가치체계 확립을 가장 중요시하고 있다. 이 결과로 본사 지역본부와 지사는 가치체계에 차이를 갖고 있음을 알 수 있다. 결과적으로 교통관리전략 수립 시 교통관리전략의 주요 관점과 그에 따른 전략들을 우선순위에 맞게 적용할 수 있었다.

• 한국산학기술학회논문지
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• 제13권9호
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• pp.3841-3848
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• 2012

획득대안 분석 프로세스는 비용, 일정, 성능 및 위험이라는 제약사항 내에서 다양한 후보 대안들 가운데에서 최적의 대안을 선택하는 것이다. 신규 무기체계 획득을 위해 사용하고 있는 기존의 대안 분석 방법은 일반적으로 요구사항 분석, 설계 조합, 그리고 비용 추정을 통해 수행되고 있다. 본 논문은 함정 설계개념 정제 및 물자적 대안분석 단계에서 다목표 의사결정 방법을 기반으로 개선된 획득대안 분석 방법을 제시한 것이다. 이번 연구에서는 시스템공학 원리를 기반으로 효과도 분석, 사업 비용 추정, 그리고 위험도 평가 기법을 활용하여 차세대 다목적 훈련지원함에 대한 실질적인 응용 및 적용 연구를 수행하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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• pp.77-81
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• 2004

In this paper a novel line interactive UPS (Uninterruptible Power Supply) using the two 4-leg VSCs and AC line reactor is proposed. The 4-leg Voltage Source Converter(VSC) can use the DC link voltage effectively by the 3-D SVPWM method. Hence the DC battery voltage can be reduced by $15\%$ in comparison to that of the conventional line-interactive UPS system. One VSC is in parallel with the AC line reactor of the power source side, and the other is in series with the load. The parallel 4-leg voltage source inverter controls three-phase line voltage independently in order to control the line reactor current indirectly. It eliminates the neutral line current and the active ripple power of the source side using the pqr theory so that unity power factor and the sinusoidal source current can be achieved even though both the source and the load voltages have zero sequence components. The series 4-leg voltage source inverter compensates the line voltage and allows the load voltage to be balanced and harmonic-free. Both of parallel and series 4-leg voltage source inverters always act as independently controllable voltage sources, so that three-phase output voltage shows a seamless transition to the backup mode. The feasibility of the proposed UPS system has been investigated and verified through computer simulation results.

• 전력전자학회논문지
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• 제20권1호
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• pp.1-10
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• 2015

This paper proposes a control algorithm for permanent magnet synchronous generators with a back-to-back three-level neutral-point clamped voltage source converter in a medium-voltage off-shore wind power system under unbalanced grid conditions. Specifically, the proposed control algorithm compensates for unbalanced grid voltage at the PCC (Point of Common Coupling) in a collector bus of an off-shore wind power system. This control algorithm has been formulated based on symmetrical components in positive and negative synchronous rotating reference frames under generalized unbalanced operating conditions. Instantaneous active and reactive power is described in terms of symmetrical components of measured grid input voltages and currents. Negative sequential component of AC input current is injected into the PCC in the proposed control strategy. The amplitude of negative sequential component is calculated to minimize the negative sequential component of grid voltage under the limitation of current capability in a voltage source converter. The proposed control algorithm enables the provision of balanced voltage at the PCC resulting in the high quality generated power from off-shore wind power systems under unbalanced network conditions.

• 전력전자학회논문지
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• 제18권2호
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• pp.161-168
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• 2013

This paper presents an algorithm of a compensation of the grid current distortion caused by the grid voltage unbalance and distortion in 3-phase bi-directional DC to AC inverter. Usually 3-phase grid system has unbalance and distortion because of connecting 1-phase and non-linear load with 3-phase load using same input node. Controlling 3-phase inverter by general method under the unbalanced and distorted grid voltage, the grid current has distortion. This distortion of the grid current cause the grid voltage distortion again. So, it need to control the grid current balanced and non-distorted, even the grid voltage gets unbalanced and distorted. There are some complex method to compensate the gird current distortion. it suggest simple method to solve the problem. Simulation and experiment is used to validate the proposed algorithm.

• Investigative Magnetic Resonance Imaging
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• 제21권4호
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• pp.210-222
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• 2017

Purpose: To develop a novel combination of controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) with integrated SSFP (CAIPI-iSSFP) for accelerated SSFP imaging without banding artifacts at 3T. Materials and Methods: CAIPI-iSSFP was developed by adding a dephasing gradient to the balanced SSFP (bSSFP) pulse sequence with a gradient area that results in $2{\pi}$ dephasing across a single pixel. Extended phase graph (EPG) simulations were performed to show the signal behaviors of iSSFP, bSSFP, and RF-spoiled gradient echo (SPGR) sequences. In vivo experiments were performed for brain and abdominal imaging at 3T with simultaneous multi-slice (SMS) acceleration factors of 2, 3 and 4 with CAIPI-iSSFP and CAIPI-bSSFP. The image quality was evaluated by measuring the relative contrast-to-noise ratio (CNR) and by qualitatively assessing banding artifact removal in the brain. Results: Banding artifacts were removed using CAIPI-iSSFP compared to CAIPI-bSSFP up to an SMS factor of 4 and 3 on brain and liver imaging, respectively. The relative CNRs between gray and white matter were on average 18% lower in CAIPI-iSSFP compared to that of CAIPI-bSSFP. Conclusion: This study demonstrated that CAIPI-iSSFP provides up to a factor of four acceleration, while minimizing the banding artifacts with up to a 20% decrease in the relative CNR.

• Industrial Engineering and Management Systems
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• 제10권3호
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• pp.197-202
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• 2011

In traditional production lines, such as assembly lines, each worker is usually assigned to a particular fixed work, and decreasing the task to master the assigned work is valuated. However, when an imbalance exists between workers' speeds, if a worker delays the overall work in the production line, the production rate of the particular line will also decrease. To avoid this problem, the "Self-Balancing Production Line" was introduced. In this type of production line, each worker is assigned work dynamically, and when specific conditions are satisfied, production remains balanced. Characteristics of these lines that can be preempted at any place have already been analyzed by some researchers. A previous paper examined the situation in which only a single worker can process one machine and cannot preempt processing, and the improved policy of an ordinary selfbalancing production line, which specifies which stations workers can process and how workers can behave. This policy achieveda high production rate with only four stations and two workers (Buzacott, 2002). In that paper, worker processing stations and the behavior of a specific worker were limited, andthe paper focused only on specific stations and workers. Therefore, it is not applicable to any worker sequence. In this paper, we focus on other ways to decrease cycle time. In this kind of line, a worker processes at his or her speed. Therefore, if a worker is assigned stations according to his or her speed, the line can decrease cycle time. To do so, we relax the assumptions of this type of line and set a new condition. Under these conditions, we compare our results to the results of previous papers.

• 한국임상약학회지
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• 제19권1호
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• pp.23-31
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• 2009

The aim of this study was to evaluate the pharmacokinetic parameters of two risedronate preparations. The clinical assessment was conducted on 46 healthy volunteers who received one tablet (Risedronate sodium 35 mg/tablet) in the fasting state, in a randomized balanced $2{\times}2$ cross-over study design. After dosing of one tablet containing 35 mg risedronate sodium, blood samples were collected serially for a period of 48 hours. Plasma was analyzed for risedronate by using LC/MS/MS assay method. The analysis system was validated in specificity, accuracy, precision, and linearity. $AUC_t$, (the area under the plasma concentration-time curve from the zero-time to 48 hr) was calculated through the trapezoidal rule. $C_{max}$ (maximum plasma drug concentration) were compiled from the plasma risedronate concentration-time data of each volunteer. No significant sequence effect was found for the pharmacokinetic parameters indicating that the cross-over design was properly performed. The 90 % - Confidence intervals of the $AUC_t$ ratio and the $C_{max}$ were from log 0.8752 to log 1.1888 and log 0.8457 to log 1.1478, respectively. These values were within the acceptable intervals between 0.80 and 1.25. Therefore, this study demonstrated that no statistically significant difference was identified with respect to the rate and extent of absorption.