• 보존과학회지
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• 제35권3호
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• pp.197-208
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• 2019

목조문화재의 생물피해는 보존환경과 밀접한 관계가 있고, 급속한 기후변화로 인해 피해가 가속화될 수 있으므로 문화재 보존을 위해서는 환경 특성을 파악하는 것이 중요하다. 따라서 본 연구에서는 순천 선암사의 조사당을 대상으로 흰개미 피해 현황과 미기상, 중기상, 국지기상의 주요 환경인자 특성을 관찰하였다. 그 결과, 조사당 북서쪽 기둥에서 뚜렷한 육안피해와 흰개미 탐지견 반응이 있었고, 북동쪽 기둥에서 흰개미 탐지반응이 추가되었다. 이 기둥들은 전면에 위치한 기둥보다 표면온도가 낮고 표면 수분량과 함수율이 높은 특징이 있었다. 각 기상의 전체 시간 평균온도는 비슷하였으나 상대습도는 차이가 있었고, 미기상은 70% 이상의 높은 상대습도가 빈번히 나타났다. 특히 조사당 내부에서 흰개미 활동 일수가 가장 많았던 것으로 산출되었다. 통계 분석 결과에서는 F 비를 통해 세 기상 간 차이가 있음을 확인하였다. 또한 온도와 상대습도의 t 통계량을 통해 환경인자 간의 차이는 온도보다 습도가 더 크고, 중기상과 국지기상에서는 상대습도 차이가 더 큰 것이 확인되었다.

• 지질공학
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• 제33권1호
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• pp.189-200
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• 2023

도시화와 산업화에 따라 도심지에 개발이 늘어나면서 지반침하로 인한 피해가 지속적으로 발생되고 있으며, 도심지에서의 건물붕괴는 대규모 인명 및 재산 피해로 이어질 위험이 크다. 굴착지반에 균등하지 않은 하중이 작용하고, 대상지반의 사전지식이 없는 경우의 지반거동에 대해서는 연구가 거의 이루어지지 않았다. 이에 따라 지반 조사 정보가 없는 흙막이 공사의 굴착 과정에서 발생되는 배면 지반의 침하거동을 분석하는 방법이 기존에는 없었고, 본 연구에서는 시계열 데이터를 가공하여 상대적 침하거동과 상호관련성을 분석하여 흙막이 벽체 배면 지반의 침하거동을 분석하고자 하였다. 본 논문에서는 평균침하량차지수와 평균상대침하량차를 정의 및 계산하였으며, 이를 좌표계에 도시하여 시간경과에 따라 측점간의 상대적 침하거동을 분석하였다. 또한 관측점들의 군집을 분류할 수 있는 기준이 필요하여 k-평균군집분석과 Dunn Index를 이용하여 분류하였다. 분석결과 계측지점의 침하량이 일정한 값으로 수렴하면서 모든 군집들이 안정영역으로 이동한 것을 확인할 수 있었으며, 군집은 세분화되었다. 이러한 분석결과를 바탕으로 연구대상의 각 측점 간 상관관계를 분석하여 연구대상 지반의 독자거동영역과 동일거동영역을 구분할 수 있었다. 이처럼 측점들 간의 상대적 침하거동을 분석을 통해 거동영역을 구분할 수 있다면, 주변지역의 융기, 지반파괴영역 예측, 터파기 공사 시 활동파괴의 방지 등 침하관리와 안정관리에 도움을 줄 수 있다고 판단된다.

• 유통과학연구
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• 제13권8호
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• pp.81-90
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• 2015

Purpose - To vitalize a market or develop a new one, companies frequently release new products into the market, often by shortening the time to market, called the release period. This research aims to investigate the purchase intention behavior of consumers in terms of buying new products at the time of product release based on the release speed. Research Design, Data, and Methodology - The research reviews the influence of relative advantage, complexity, and compatibility among innovative attributes of new products, as proposed by Rogers. Moreover, it examines the moderating effect of the innovative new product attributes in terms of speed of obsolescence of old products and how that influences consumer purchase behavior. Additionally, this study tests the research hypotheses using empirical analysis. Results - The analysis demonstrated that the relative predominance (H1) and suitability (H3) of new products had a statistically significant positive influence on new product purchase intention. However, the complexity (H2) of new products had a statistically significant positive influence on new product purchase intention in contrast to its predicted sign (-). The results of the moderating effect of the old product use period were as follows. H4-1 was not supported since the difference between the path coefficients of the group with the low level old product use period and the group with the high level, represented by the relationship of relative predominance and new product purchase intention, was not statistically significant. H5-1 was also not supported since the difference between the path coefficients of the group with the low level of old product use period and the group with the high level, represented by the relationship of complexity and new product purchase intention, was not statistically significant. However, H4-2 was supported since the difference between the path coefficients of the group with the low level of old product use frequency and the group with the high level, represented by the relationship of relative advantage and new product purchase intention was statistically significant. H5-2 was not supported since the difference between the path coefficients of the group with the low level of old product use frequency and the group with the high level, represented by the relationship of complexity and new product purchase intention, was not statistically significant. H6-2 was also not supported since the difference between the path coefficients of the group with the low level of old product use frequency and the group with the high level, represented by the relationship of compatibility and new product purchase intention, was not statistically significant. Conclusion - According to the results, only H4-2 among the hypotheses on the moderating effect of the old product use period and use frequency was statistically significant. Future research should focus on carrying out a detailed review of the hypothesis on the moderating effect of the old product usage period and frequency, find the cause, and connect this to potential new research.

• 한국인터넷방송통신학회논문지
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• 제13권5호
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• pp.85-91
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• 2013

실내에서의 위치기반 서비스 및 상황인식 서비스를 위해서는 실내에서의 정밀한 위치인식 기술이 필수적이다. 신호원과 여러 개의 신호 수신기와의 거리 차이를 이용하여 신호원의 상대위치를 추정하는 TDOA(Time Difference of Arrival) 기술이 사용되고 있는데, 거리 차이 측정의 오차에 따른 위치 추정 오차가 발생하므로 이를 최소화하기 위한 연구가 많이 진행되어 왔다. 본 논문에서는 신호원과의 거리 차이값을 이용하여 계산된 여러 근중에서 실제의 근을 선별하고 이를 평균내어 신호원의 위치를 추정하는 알고리즘이 제안되었으며, 기존의 방법에 비해 오차가 개선되었다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제18권2호
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• pp.208-216
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• 1996

The esthetics of chin contour is very important in facial deformities, and the quantity of soft tissue overlying the symphysis can be helpful to the correct diagnosis and surgical treatment for optimal facial harmony. The objectives of this study is to measure the different thicknesses of skeletal and soft tissues of chin on lateral cephalometric radiographs, to obtain the mean values of normal Korean adults, and to investigate the relative proportions of skeletal and soft tissues of chin. The results were as follows ; 1. In normal Korean adults, the relative proportions of the distances of soft tissue toward skeletal tissue were 1.5 in B point and 0.95 in Pg, and there were significant difference between male and female in the relative proportion of Pg (p<0.05). The relative proportion of the distances of vertical soft tissue toward horizontal soft tissue of Me was 1.91, and there were not significant difference between male and female. 2. In normal Korean adults, the distances of skeletal and soft tissues of chin showed no correlation, but the distances of vertical and horizontal soft tissues of Me showed high correlation (p<0.01). 3. In normal Korean adults, the correlations among the distances of each skeletal and soft tissues of chin were significantly high in both of male and female (p<0.01). Among the relative proportions of the distances of skeletal and soft tissues, the correlations of the proportions of B point and Mp and the proportions of Mp and Pg were significantly high (p<0.01).

• 말소리와 음성과학
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• 제5권4호
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• pp.99-107
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• 2013

The purpose of this study is to examine the relative distances among English front vowels in a message produced by 47 Korean and American speakers in order to better instruct pronunciation skills of English vowels for Korean English learners. A Praat script was developed to collect the first and second formant values(F1 and F2) of eight words in each sound file which was recorded from an internet speech archive. Then, the Euclidean distances were measured between the three vowel pairs: [i-ɛ], [i-ɪ], and [ɛ-æ]. The first vowel pair [i-ɛ] was set as the reference from which the relative distances of the other two vowel pairs were measured in percent in order to compare the vowel sounds among speakers of different vocal tract lengths. Results show that F1 values of the front vowels produced by the Korean and American speakers increased from the high front vowel to the low front vowel wih differences among the groups. The Korean speakers generally produced the front vowels with smaller jaw openings than the American speakers did. Secondly, the relative distance of the high front vowel pair [i-ɪ] showed a significant difference between the Korean and American speakers while that of the low front vowel pair [ɛ-æ] showed a non-significant difference. Finally, the Korean speakers in the higher proficiency level produced front vowels with higher F1 values than those in the lower proficiency level. The author concluded that Korean speakers should produce the front high vowels distinctively by securing sufficient relative distance of the formant values. Further studies would be desirable to examine how strong the Korean speakers' English proficiency correlate with the relative distance of target words of comparable productions.

• 한국버섯학회지
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• 제16권4호
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• pp.263-266
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• 2018

표고 시설재배에 있어 적정 상대습도를 구명하여 고품질 버섯생산 데이터를 제시하기 위해 상대습도를 달리 처리한 결과는 다음과 같다. 상대습도에 따른 생육특성을 조사한 결과, 갓의 명도값은 RH65%에서 높았고, 적색도는 RH95%에서 높았으며, 황색도는 상대습도 간 유의적 차이가 나타나지 않았다. 갓의 경도는 RH95%에서 높은 경향이었다. 갓직경은 RH95%에서 높게 측정되었고, 갓두께는 RH95%에서 높았다. 대길이의 경우 유의적 차이가 나타나지 않았지만 상대습도가 증가할수록 대길이가 증가하는 경향을 보였으며, 대직경은 RH95%에서 높게 측정되었다. 수량은 RH95%에서 유의적으로 높게 측정되었다. 화고발생률은 상대습도가 낮아질수록 높게 조사되었다. 위의 결과를 통해 RH95%에서 표고 자실체의 크기, 수량이 높게 조사되었지만 버섯의 갓색이 어둡고 화고 발생 비율이 낮은 결과를 나타내어 시설재배에서 고품질의 화고 버섯을 생산할 수 있는 상대습도는 65%와 85%인 것으로 판단되었다.

• 한국소음진동공학회논문집
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• 제12권1호
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• pp.65-72
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• 2002

Generally, there are laser operating equipments( aligner, stepper) and electronic microscope( SEM, TEM) as a high precision manufacturing and inspection equipment in semiconductor production companies, precision examination and measuring laboratories. Mostly, these equipments are characterized by projection and target part. The relative displacements between projection and target part are dominant roles in vibrational problem in these precision equipments. These relative displacements are determined by the position of incoming vibration and the difference of vibration response in projection and target part. In this study, the allowable vibrational limits are suggested and the vibrational reduction plans are proposed by measurement and analysis of vibration phenomenon in the Clean Room in PDP(plasma display panel) production building. The vibration performance is evaluated by comparison relative displacements between projection and target part before/after the vibration isolation plan.

• Bulletin of the Korean Chemical Society
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• 제31권11호
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• pp.3291-3296
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• 2010

A gelastatins (1), natural MMP inhibitors, and their hydroxamate analogues (2) in TACE enzyme evaluated for discovery of potent TACE inhibitors. We have employed molecular dynamics simulations to compute the relative free energy of hydration and binding to TACE for gelastatin (1) and its hydroxamate analogue (2). The relative free energy difference is directly described in this article using the free energy perturbation approach as a means to accurately predict the TACE inhibitor of gelastatin analogues. The results show that the good agreement between the experimental and theoretical relative free energies of binding, gelastatin hydroxamate (2) binds stronger to TACE by -3.37 kcal/mol. The desolvation energy costs significantly reduced binding affinity, hydroxamate group associated with high desolvation energy formed strong favorable interactions with TACE with more than compensated for the solvation costs and therefore led to an improvement in relative binding affinity.

• 한국농공학회논문집
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• 제54권5호
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• pp.69-77
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• 2012

Relative density, used to express dynamics condition of sand quantitatively, is measured by RI Test, Standard Penetration Test and Cone Penetration Test. Each measurement method has demerits, which is complicated or needs a specific analysis instrument and an analysis of expert. Also the ground is in wet condition commonly because of an unsaturated zone between a saturated zone and a surface, so the behaviour of the ground has different engineering properties unlike the dry ground and it diminishes accuracy of measuring relative density. In this study, the correlation between relative density and penetration of fall cone test in dry condition and wet condition with variation of water content was analyzed and a simple measuring method for relative density was suggested. As a result, there were difference of penetration between dry sands and wet sands, the correlation between relative density and penetration showed linear expression and relative density could be measured by the linear relation.