• 한국산학기술학회논문지
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• 제17권9호
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• pp.141-155
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• 2016

본 연구는 중년기 성인의 뇌졸중 관련 건강지식, 낙관적 편견 및 건강증진 생활양식 정도와 관계를 파악하고, 건강증진 생활양식에 미치는 효과를 파악하기 위한 서술적 조사연구이다. 연구기간은 2015년 7월 15일부터 8월 15일이며, 연구대상자는 40세 이상 60세 미만의 성인 191명이며, 자료 수집은 구조화된 설문지를 이용한 자가 보고식으로 이루어졌다. 자료분석은 PASW Statistics 21.0과 AMOS 21.0 프로그램을 사용하였으며, 분산분석, 상관성분석, 구조방정식 모형 분석 등을 실시하였다. 중년기 성인은 뇌졸중 위험요인으로 흡연과 고혈압을 당뇨병보다 높게 인식하였으며, 뇌졸중에 대한 낙관적 편견은 미미하였다. 뇌졸중 관련 건강지식은 낙관적 편견(r=-.143, p=.048), 건강증진 생활양식(r=.268, p=<.001)과 상관관계가 있었고, 낙관적 편견은 건강증진 생활양식의 대인관계 및 스트레스 행위(r=.177, p=.014)와 상관관계가 있었다. 또한 뇌졸중 관련 건강지식이 낙관적 편견보다 건강증진 생활양식에 더 큰 영향을 미치는 것으로 확인하였다. 결론적으로 중년기 성인의 뇌졸중에 관한 능동적인 정보획득과 건강 지식, 낙관적 편견이 뇌졸중 관련 건강증진 생황양식에 중요한 요인임을 알 수 있었다. 그러므로 중년기 성인의 뇌졸중 관련 건강증진 생활양식을 향상시키기 위한 교육 프로그램에는 뇌졸중 관련 건강지식을 높이고, 낙관적 편견을 감소시킬 수 있는 방안이 고려되어야 할 것이다.

• 한국음향학회지
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• 제24권2호
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• pp.87-96
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• 2005

해양환경에서 정합장처리를 통해 음원위치를 추정할 경우 실측신호의 음장과 복제음장 사이에 각종 매개변수의 오정합이 발생하여 상관값의 저하와 함께 음원 위치추정 결과에 바이어스를 발생시킨다. 본 논문에서는 정합장처리를 이용한 음원 위치추정에서 해양환경 및 시스템 오정합 매개변수로 인한 바이어스와 상관값의 변화 그리고 민감도에 대해서 고찰하였다. 이를 위해 Pekeris 해양 도파관에서 수치실험을 수행하였으며, 그 결과 매개변수 오정합이 음원 위치에서의 바이어스와 상관값의 감소를 발생시켰다. 또한 매개변수 민감도 평가를 통해 배열의 경사와 수심, 해저면 수심과 해저층의 음속이 민감도가 높음을 확인 할 수 있었다.

• 대기
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• 제18권1호
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• pp.71-81
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• 2008

In this study, in order to estimate high resolution precipitation with monthly time scales, Parameter-elevation Regressions on Independent Slopes Model (PRISM) was modified and configured for Korean precipitation based on elevation, distance, topographic facet, and coastal proximity. Applying this statistical downscaling model to Korean precipitation for 5 years from 2001 to 2005, we have compiled monthly grid data with a horizontal resolution of 5-km and evaluated the model using bias, root mean square error (RMSE), and correlation coefficient between the observed and the estimated. Results show that bias, RMSE, and correlation coefficient of the estimated value have a range from 0.2% to 1.0%, 19.6% (June) to 43.9% (January), and 0.73 to 0.84, respectively, indicating that the modified Korean PRISM (K-PRISM) is reasonably worked by weighting factors, i.e., topographic effect and rain shadow effect.

• 한국농공학회논문집
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• 제63권6호
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• pp.49-60
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• 2021

BCSA (Bias-Correction and Stochastic Analog) is a statistical downscaling technique designed to effectively correct the systematic errors of GCM (General Circulation Model) output and reproduce basic statistics and spatial variability of the observed precipitation filed. In this study, the applicability of BCSA was evaluated using the ASOS observation data over South Korea, which belongs to the monsoon climatic zone with large spatial variability of rainfall and different rainfall characteristics. The results presented the reproducibility of temporal and spatial variability of daily precipitation in various manners. As a result of comparing the spatial correlation with the observation data, it was found that the reproducibility of various climate indices including the average spatial correlation (variability) of rainfall events in South Korea was superior to the raw GCM output. In addition, the needs of future related studies to improve BCSA, such as supplementing algorithms to reduce calculation time, enhancing reproducibility of temporal rainfall patterns, and evaluating applicability to other meteorological factors, were pointed out. The results of this study can be used as the logical background for applying BCSA for reproducing spatial details of the rainfall characteristic over the Korean Peninsula.

• 천문학회보
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• 제46권1호
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• pp.27.3-27.3
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• 2021

Supernova (SN) cosmology is based on the assumption that the width-luminosity relation (WLR) in the type Ia SN luminosity standardization would not vary with progenitor age. Unlike this expectation, recent age datings of stellar populations in host galaxies have shown significant correlations between progenitor age and Hubble residual (HR). It was not clear, however, how this correlation arises from the SN luminosity standardization process, and how this would impact the cosmological result. Here we show that this correlation originates from a strong progenitor age dependence of the WLR and color-luminosity relation (CLR), in the sense that SNe from younger progenitors are fainter each at given light-curve parameters x1 and c. This is reminiscent of Baade's discovery of two Cepheid period-luminosity relations, and, as such, causes a serious systematic bias with redshift in SN cosmology. We illustrate that the differences between the high-z and low-z SNe in the WLR and CLR, and in HR after the standardization, are fully comparable to those between the correspondingly young and old SNe at intermediate redshift, indicating that the observed dimming of SNe with redshift is most likely an artifact of over-correction in the luminosity standardization. When this systematic bias with redshift is properly taken into account, there is no evidence left for an accelerating universe, and the SN data now support a decelerating cosmic expansion. Since the SN cosmology has long been considered as the most direct evidence for an accelerating universe with dark energy, this finding poses a serious question to one of the cornerstones of the concordance model.

• 응용통계연구
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• 제17권1호
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• pp.61-73
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• 2004

교체표본조사에서는 모든 표본단위를 복수 개(=G)의 교체그룹으로 나누고 일정 횟수만큼 조사한 후 표본단위 의 교체를 하는 경우와 조사기 간 동안 동일한 표본단위를 조사한 후 교체그룹 자체를 교체하는 두 가지 경우가 있다. 본 연구는 후자의 경우를 일반화하는 것으로, 매 조사월에서 하나의 교체그룹이 조사되고 이 교체그룹에 속한 모든 표본단위는 최근 l개월 동안의 정보를 제공하는 l-수준 교체표본설계이다. 표본단위 교체가 오직 교체그룹의 총 개수인 G와 회상 개월 수인 l에 의해 결정되므로 이를 l/G 교체표본설계로 일반화하였으며 일반화복합추정량의 분산과 두 가지 형태의 편향(bias)하에서 MSE를 구하고 절충 GCE(compromise GCE)의 계수를 유도하였다. 또한 GCE의 분산과 MSE를 상관계수, 편향, 표본조사단위의 분산의 형태, 그리고 설계간격(design gap)의 형태에 따라 분석하였다.

• 한국의류산업학회지
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• 제11권3호
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• pp.453-459
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• 2009

The purpose of this study was to provide the basic knowledge to determine the proper seam finish according to the design of sewing products. Four seam finishes(no seam finishes, over-edged seam finishes, turned-and-stitched seam finishes, and bias-bound seam finishes) were constructed with seams in warp, weft and bias directions of the fabric. Using a drape measurement system involving two 18cm diameter supporting disks and a digital camera, the images of draped specimens were captured and processed. Drape behavior was evaluated in terms of drape coefficient, node number, and drape profile. Drape coefficients of the fabrics increased with seam formation and varied by the seam finishes, however no significant differences in drape coefficients by the seam finishes were observed on the heavier fabric. Node numbers of heavier fabric were more deeply affected by the seam finishes than those of lighter fabric. The specimens with turned-and-stitched seam finishes and bias-bound seam finishes showed significantly smaller node numbers compared to the specimens with no seam finishes and over-edged seam finishes on heavier fabric. The length of the seamed part showed positive correlation with the weight of the specimens and negative correlation with the number of nodes in each seam direction. The maximum length of all draped specimens was found in the same direction as the seam direction. In the case of the lighter fabric, the seam and the seam finish had a great influence on the shape of the draped profile.

• Asian-Australasian Journal of Animal Sciences
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• 제17권12호
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• pp.1689-1694
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• 2004

This study was conducted to develop a novel adjustment factors for 305 days using 138,103 lactation records and 1,770,764 daily records, which were based on environmental circumstances such as herd year, season, age at calving, dry period and lactating stages. The present study showed that the change of persistency of cows at the first parity from total lactacting characteristics was slowly processed, while it was rapidly changed in cows at the second parity stage. Particularly, there was an outstanding difference between the first and second parity cows. Milk yield and composition increased as the age at calving was increased. In addition, milk yield and composition were higher at the first parity on fall compared with others, and those were higher at the more than second parity on fall and winter compared with other parity stages and seasons. The cow of dry group was included into lactating records of more than second parity stage. The data indicated that optimal results arose from 45-70 days of dry period. Milk yield was decreased when dry period was longer or shorter than 45-70 days. The lactating days were divided into 17, 28 and 38 stages to compare the multiplicative correction factors. The factor was effective at 28 stages on the first parity. The total correlation coefficients were 0.93832, 0.95058 and 0.95076 at the present correction factor, 17 stage and 28 stage, respectively. At second parity, the factor was higher in dry group 1 and 3 at 17 stage, and it was higher in dry group 2 at 28 stage compared with others. Therefore, the present study showed that the percent squared bias (PSB), which was calculated from the novel correction factor, was better than previously used correction factors. Also, the present study indicated that the bias of the novel correction factor was improved, and this factor could be more accurate compared with others.

• Parasites, Hosts and Diseases
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• 제53권6호
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• pp.689-697
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• 2015

The tapeworm Taenia solium is an important human zoonotic parasite that causes great economic loss and also endangers public health. At present, an effective vaccine that will prevent infection and chemotherapy without any side effect remains to be developed. In this study, codon usage patterns in the T. solium genome were examined through 8,484 protein-coding genes. Neutrality analysis showed that T. solium had a narrow GC distribution, and a significant correlation was observed between GC12 and GC3. Examination of an NC (ENC vs GC3s)-plot showed a few genes on or close to the expected curve, but the majority of points with low-ENC (the effective number of codons) values were detected below the expected curve, suggesting that mutational bias plays a major role in shaping codon usage. The Parity Rule 2 plot (PR2) analysis showed that GC and AT were not used proportionally. We also identified 26 optimal codons in the T. solium genome, all of which ended with either a G or C residue. These optimal codons in the T. solium genome are likely consistent with tRNAs that are highly expressed in the cell, suggesting that mutational and translational selection forces are probably driving factors of codon usage bias in the T. solium genome.

• 디지털융복합연구
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• 제20권1호
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• pp.349-359
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• 2022

본 연구는 중년 성인을 대상으로 뇌졸중 관련 건강지식 및 낙관적 편견, 사회적지지, 건강증진 생활양식 정도 영향을 미치는 요인을 파악하기 위한 서술적 조사연구이다. 연구대상자는 충북 C 도시와 충남 D 도시, 경북 K도시에 거주하는 40세-65세 성인 220명을 대상으로 시행하였다. 수집한 자료는 SPSS 23.0 프로그램을 이용하여 기술통계와 t-test, ANOVA, Pearson correlations, 다중회귀분석으로 분석하였다. 본 연구의 결과는 다음과 같다: 연구대상자의 뇌졸중 관련 건강증진 생황양식은 평균 44.27점으로 중간 수준이상을 나타났다. 연구대상자의 뇌졸중 관련 건강증진 생활양식은 낙관적 편견(r=.18, p=.001)과 사회적 지지(r=.61, p<.000)는 양의 상관관계를 나타냈다. 회귀분석결과 뇌졸중 관련 건강교육 필요 인지(β=.12, p=.010), 낙관적 편견(β=.18, p=.040), 사회적지지(β=.48, p<.000)는 뇌졸중 관련 건강증진 생활양식의 영향요인으로 확인되었다. 두 요인의 설명력은 38.5%로 확인되었다. 이에 중년기 성인의 뇌졸중 예방을 위한 건강증진 생활양식을 향상시키기 위한 교육 프로그램에는 사회적 지지를 향상시키는 중재전략과 낙관적 편견을 경감시킬 수 있는 방안이 고려되어져야 한다.