• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.513-516
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• 2008

건설프로젝트는 많은 불확정 요소로 인해 다양한 리스크를 가지고 있기 때문에 프로젝트 진행 과정에서 반복적인 성과측정은 중요하다. 그러나 현재 건설프로젝트에서 성과측정은 시공사 중심의 성과측정 및 성과관리가 이루어 져서 프로젝트의 진행상황에 따른 발주자의 능동적인 프로젝트 관리가 어렵다. 이에 본 연구에서는 실제 실행된 공공 아파트 건설공사의 공기 비용 데이터를 타입별로 분류하여 회귀분석을 실시하고 타입별 회귀식을 도출, 발주자 중심의 작업분류체계를 설정하고 이를 활용하여 이를 발주자 중심의 성과측정기준선을 제안방안을 제시하고자 한다.

• EDISON SW 활용 경진대회 논문집
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• 제5회(2016년)
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• pp.183-189
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• 2016

In this paper, an optimization study on a helicopter rotor blade cross-section was made. Generalization was made to the baseline cross-section to simplify the analysis. To have better performance in aeroelastic response, with the aerodynamic center being the origin of the baseline, the distance between aerodynamic center and shear center, and the distance between mass center and shear center of the blade were minimized. For efficient searching of optimum solutions over the design space, grid search method, which is a method of graphical search was used. Two design variables, radius of balancing weight at leading edge, and offset of the spar from leading edge were selected for the study. Cubic spline interpolation method was used to accommodate searching of the optimum solution. 2-Leveled searching system was devised in accordance with the interpolation method. Optimum solution was found to show 6% decrease in both distance between aerodynamic center and shear center, and mass center and shear center to the baseline.

• 대한약침학회지
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• 제26권3호
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• pp.276-284
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• 2023

Objectives: Previous studies have shown that anger can lead to frontal lobe α (8-13 Hz) band asymmetry (FAA) in electroencephalogram (EEG), in accordance with motivational direction. This pilot study aimed to investigate the impact of acupuncture on FAA elicited by anger. Methods: Thirty-four right-handed participants scoring above 75 points on the Novaco Anger Scale were included. Baseline EEG signals were recorded for eight minutes using a 32-channel cap under comfortable conditions. Anger was induced through a nine-minute sequence of Articulated Thoughts in Simulated Situations (ATSS) task. Following that, participants received acupuncture at GB20 and GB21 for 10 minutes. Fast Fourier transform was employed for frequency analysis, and repeated measure ANOVA was conducted for statistical analysis. Results: The results revealed that participants exhibited significantly higher FAA (p = 0.026), particularly in the left hemisphere, after the ATSS task sequence compared to the baseline. During acupuncture treatment, the greater left-sided FAA was significantly reduced (p = 0.027) and reversed. Upon the cessation of acupuncture, FAA returned to a value between the baseline and the anger-evoked stage (p = 0.046). Conclusion: The EEG results of this study revealed that anger stimulation induced an increase in left-sided FAA, which was effectively alleviated by acupuncture. This led to an immediate restoration of FAA asymmetry induced by anger. These findings suggest the potential of acupuncture as a treatment option for reducing FAA associated with anger.

• 천문학회보
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• 제24권2호
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• pp.105-105
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• 1999

• Journal of Preventive Medicine and Public Health
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• 제32권4호
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• pp.435-442
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• 1999

Objectives: The purpose of this study was to examine the twelve-year incidence of hypertension, and to find risk factors for the incidence in adult population in Kangwha County, Korea. Methods: In 1986, 413 males(mean age 37 years) and 434 females(mean age 33 years) were examined in the Kangwha Study, Among 764 non-hypertensive participants, 164 males and 214 females were reexamined in 1998. Blood pressure(BP) was measured with standard mercury sphygmomanometers. Multiple logistic regression analysis was used to estimate the relative risk of risk factors on the incidence of hypertension. Results: During the 12-year period, 68 of 164 males and 53 of 2f4 females developed hypertension. In a multiple logistic model adjusted for age and pulse rate, baseline BP, baseline body mass index(BMI) and BMI change during the follow-up period were significantly related to the incidence of hyperiension. Adjusted relative risk(RR)s of baseline high-normal BP were 3.90(95% CI: 1.81-7.84) in males, and 12.72(95% CI: 3.70-30.73) in females. Compared with lower baseline BMI group, adjusted RRs of middle baseline BMI group were 2.66(95% CI: 1.19-5.70) in males, and 2.33(95% CI: 0.95-5.55) in females. Adjusted RRs of upper baseline BMI group were 3.52(95% CI: 1.53-7.67) in males and 3.63(95% CI: 1.50-8.43) in females. Increase of BMI was positively related to the incidence in males(adjusted RR=2.71, 95% CI: 1.00-6.71) and females(adjusted RR=3.05, 95% CI: 1.29-6.88). Conclusions: The twelve-year incidence of hypertension was 41.5% in males, and 25.8% in females. Baseline BP, baseline BMI, and BMI change were strongly related to the incidence of hypertension.

• 한국산학기술학회논문지
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• 제20권3호
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• pp.500-506
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• 2019

본 연구에서는 arPLS(asymmetrically reweighted penalized least squares) 방법에서 분광신호의 길이와 차수를 이용한 최적의 평활화 매개변수를 위한 결정함수를 제안한다. 분광신호의 기준선 보정은 분석 시스템의 성능을 좌우하는 매우 중요한 과정으로 많은 경우에 육안 검사로 매개변수를 선택하여 추정한다. 이 과정은 매우 주관적이고 특히 대량의 데이터인 경우 지루한 작업을 동반하므로 좋은 분석 결과를 보장하기 어렵다. 이러한 이유로 기준선 보정에서 최적의 매개변수를 결정하기 위한 객관적인 방법이 필요하다. 제안한 결정함수는 기준선 보정에 사용 가능한 매개변수 범위의 중앙값이 신호의 길이가 길어질수록 증가하고, 신호의 차수가 작아질수록 감소하는 관계를 정리하여 모델링하였다. 모의실험 데이터는 신호의 길이 7가지에 대해 조합한 분석신호 4가지와 선형 기준선과 2차, 3차, 4차 곡선 기준선을 각각 더하여 모두 112개를 생성하였다. 모의실험 데이터와 실제 라만 분광신호를 이용한 실험에서 제안한 결정함수의 평활화 매개변수가 기준선 보정에 효과적으로 적용될 수 있음을 확인하였다.

• 제어로봇시스템학회논문지
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• 제12권3호
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• pp.300-306
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• 2006

In this paper an error analysis of 3-dimensional GNSS attitude determination system is given. The attitude error covariance matrix is derived and analyzed. It implies that attitude errors are affected by the baseline length and configuration, the satellites numbers and geometry, receiver measurement noises and the nominal attitude of the vehicle. By defining Euler Angle Dilution Of Precision (EADOP) which is analogous to GDOP, roll, pitch and yaw errors can be efficiently analyzed. However the expression of the attitude error is too complex to get some intuitions. Therefore with a commonly adopted assumption, new expressions for attitude error are derived. The formulas are easy to compute and represent the attitude error as a function of the nominal attitude of a vehicle, the baseline configuration and the receiver noise. Using the formula, the accuracy of the attitude can be analytically predicted without the computer simulations. Applications to some widely used configurations reveal the effectiveness of the proposed method.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 추계학술대회 논문집
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• pp.750-755
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• 2012

In this study we conduct the optimal spot-weld layout design of vehicle body structure considering dynamic stiffness and side impact. We conduct both linear static analysis and nonlinear analysis with a baseline model to verify the process. 13 design variables will be selected for the effect analysis. Then, topology optimization is conducted to each selected design variable. The design constraints are formulated to improve the dynamic stiffness and side impact performance. Objective function is to set the density of weld component. Optimal spot-weld layout design are compared with the baseline model to show the improvement.

• 치위생과학회지
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• 제18권5호
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• pp.305-311
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• 2018

The purpose of this study was to identify the effect of providing toothbrushing by professionals as part of oral hygiene education for the elderly. We randomly visited 12 centers in the metropolitan city and analyzed the data of 114 participants among 310 early registrants aged >65 years, who participated in the study at all 3 time points. The subjects were categorized into an experimental group (odd-numbered visits) and a control group (even-numbered visits). Oral hygiene practices were provided for both experimental and control groups, but professional toothbrushing was performed in a different manner in the experimental group. Differences in plaque index (PI) according to the subjects' general characteristics and oral health status were assessed using the t-test, and the effect of PI difference between the experimental and control groups was assessed by repeated measure two-way analysis of variance. A stepwise multiple regression analysis was used to analyze factors affecting the PI. At baseline, the mean overall PI was 61.82. In both experimental and control groups, the PI significantly reduced from the baseline (p<0.01). At 5 weeks, the experimental group showed a decrease of 27.16 points from the baseline, and the 10-week PI was similar to the 5-week PI. The control group showed a decrease of 14.87 points from the baseline, and the PI increased by 5.74 points at 10 weeks. PI-related factors were gender and self-xerostomia. The PI was lower in the female group and the group with self- xerostomia (p<0.01). It is important to select an appropriate method to educate elderly subjects on proper removal of dental plaque and to habituate correct behavior, which requires inclusion of a direct toothbrushing intervention by a specialist.

• 대한전자공학회논문지SP
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• 제41권4호
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• pp.103-111
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• 2004

화자 정규화 방법은 화자 독립 음성인식 시스템에서 음성 인식의 정확성을 높이기 위한 성공적인 방법으로 알려져 왔다. 널리 사용되는 화자 정규화 방법은 maximum likelihood 반의 주파수 warping 방법이다. 본 논문은 주파수 warping 보다 더 좋은 화자 정규화의 성능 개선을 위해 새로운 파워 스펙트럼 warping 방법을 제안한다. 파워 스펙트럼 warping은 멜 주파수 켑스트럼 분석(MFCC) 방법을 이용하며, MFCC 처리 단계에서 필터 뱅크의 파워 스펙트럼을 조절함으로써 화자 정규화를 수행하는 간단한 메커니즘으로 갖는다. 또한 본 논문은 파워 스펙트럼 warping과 주파수 warping 방법을 서로 결합한 hybrid VTN 방법을 제안한다. 본 논문의 실험은 baseline 시스템에 각 화자 정규화 방법을 적용하여 SKKU PBW DB에서 인식 성능을 비교 분석하였다. 실험 결과를 보면 baseline 시스템의 단어 인식 성능을 기준으로 주파수 warping은 2.06%, 파워 스펙트럼 warping은 3.05%, 그리고 hybrid VTN은 4.07%의 단어 에러 율의 감소를 보였다.