• 한국토양비료학회지
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• 제45권1호
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• pp.112-117
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• 2012

The Revised Universal Soil Loss Equation (RUSLE) is a revision of the Universal Soil Loss Equation (USLE). However, changes for each factor of the USLE have been made in RUSLE which can be used to compute soil loss on areas only where significant overland flow occurs. RUSLE which requires standardized methods to satisfy new data requirements estimates soil movement at a particular site by utilizing the same factorial approach employed by the USLE. The rainfall erosivity in the RUSLE expressed through the R-factor to quantify the effect of raindrop impact and to reflect the amount and rate of runoff likely is associated with the rain. Calculating the R-factor value in the RUSLE equation to predict the related soil loss may be possible to analyse the variability of rainfall erosivity with long time-series of concerned rainfall data. However, daily time step models cannot return proper estimates when run on other specific rainfall patters such as storm and daily cumulative precipitation. Therefore, it is desirable that cross-checking is carried out amongst different time-aggregations typical rainfall event may cause error in estimating the potential soil loss in definite conditions.

• Journal of Periodontal and Implant Science
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• 제51권6호
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• pp.422-432
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• 2021

Purpose: The aim of this study was to compare straight and tapered implant designs in terms of marginal bone loss, the modified plaque index (mPI), and the modified bleeding index (mBI) for 5 years after functional loading. Methods: Twelve patients were recruited. Two types of implants were placed adjacent to each other: 1 straight implant and 1 tapered implant. Marginal bone loss, mPI, and mBI were measured every year for 5 years after loading. Results: The straight implants showed 0.2±0.4 mm of marginal bone loss at 5 years after loading, while the tapered implants showed 0.2±0.3 mm of marginal bone loss; this difference was not statistically significant (P=0.833). Our analysis also showed no statistically significant differences in mPI (straight implants: 0.3±0.3 vs. tapered implants: 0.2±0.3; P=0.414) or in mBI (straight implants: 0.3±0.4 vs. tapered implants: 0.2±0.3; P=0.317) at 5 years after prosthesis delivery. Conclusions: Straight and tapered implants showed no significant differences with respect to marginal bone loss, mPI, and mBI for 5 years after loading.

• 치위생과학회지
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• 제13권4호
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• pp.418-425
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• 2013

본 연구는 생활습관과 치주건강상태의 관련성을 파악하여 올바른 생활습관을 통한 치주질환의 예방 및 유지를 위한 기초자료를 제공하기 위하여 실시되었다. 연구대상은 일부지역 치과의원에 내원한 40~50대 성인 남녀 총 326명을 대상으로 하여 구조화된 설문지와 치주건강상태를 측정하여 조사 분석하였다. 수집된 자료는 IBM SPSS Statistics 19.0 통계프로그램을 이용하여 분석한 결과는 다음과 같다. 1. 흡연여부는 치은염 지수(p<0.01), 치주낭 깊이(p<0.001), 임상적 부착소실(p<0.001)에 따라 통계적으로 유의한 차이를 보였다. 2. 일일 흡연량은 치은염 지수(p<0.05), 치주낭 깊이(p<0.01), 임상적 부착소실(p<0.001)에 따라 통계적으로 유의한 차이를 보였다. 3. 흡연기간은 치은염 지수(p<0.05), 치주낭 깊이(p<0.01), 임상적 부착소실(p<0.001)에 따라 통계적으로 유의한 차이를 보였다. 4. 음주주기는 치은염 지수(p<0.05), 임상적 부착소실(p<0.05)에 따라 통계적으로 유의한 차이를 보였다. 5. 흡연을 하는 경우(p<0.05) 임상적 부착소실에 영향을 미치는 것으로 조사되었다. 이상의 결과에서 치과진료기관은 환자들에게 건강한 치주상태를 예방 및 유지하기 위해서는 과도한 흡연과 음주는 치주건강상태에 영향을 미친다는 사실을 인식시킬 필요가 있으며 더불어 체계적인 금연과 절주를 위한 교육프로그램 개발이 마련되어야 할 것이다.

• Ecology and Resilient Infrastructure
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• 제2권4호
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• pp.311-316
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• 2015

본 연구는 도시생태계 건전성 증진을 위한 녹지총량제 도입을 위해 국내 법규를 토대로 녹지총량의 정의와 유형을 분류하고, 전국단위의 녹지총량 평가지표를 도출하여 산정하였으며, 이를 토대로 전국 시도별 녹지총량을 지수화 하였다. 결과는 다음과 같다. 첫째, 녹지총량은 "도시공원 및 녹지 등에 관한 법률", "토의 계획 및 이용에 관한 법률" 등에서 정의하는 '녹지', '공원녹지', '녹지지역' 등을 포함하는 포괄적 의미의 녹지이다. 둘째, 녹지총량 산정을 위한 녹지의 유형은 도시공원과 완충녹지, 경관녹지, 연결녹지 등의 시설녹지를 포함하는 공원녹지, 보전녹지지역, 생산녹지지역, 자연녹지지역을 포함하는 녹지지역, 교목, 관목, 지피 등의 식생으로 점유된 산림, 초지, 습지를 포함하는 녹피지로 분류할 수 있다. 셋째, 1인당 공원녹지, 공원녹지율, 1인당 녹지지역, 녹지지역율, 1인당 녹피면적, 녹피율 등 6가지 평가지표를 적용하여 전국 시도별 녹지총량을 산정하였으며, 이를 토대로 시도별 녹지총량을 지수화한 결과에 따르면 특별 광역시에서는 세종특별시가 가장 높았고 서울특별시와 대구광역시가 가장 낮았으며, 도 지역에서는 충청북도가 가장 높았고 경기도와 제주특별자치도가 가장 낮았다.

• 한국전기전자재료학회논문지
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• 제22권8호
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• pp.704-713
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• 2009

As using recruitment phenomenon, SISI test and Bekesy audiometry are employed to differentially diagnose both the cochlear hearing loss and the retrocochlear hearing loss. The main purpose of this study is to find out the sensitivity and specificity of the SISI test within the scope of 1 KHz to 4 KHz in diagnosing various types of hearing losses. In this study, the Bekesy audiometry was conducted for Bekesy audiograms of certain groups according to Jerger's classification, which included persons with normal hearing and patients with hearing impairment. Subject persons of the SISI test were categorized into the several groups with normal hearing, mild hearing loss, moderate hearing loss, moderate-severe hearing loss and severe hearing loss, respectively. The sensitivity and specificity of certain groups were evaluated according to the SISI scores of 20 % below, 25 ${\sim}$ 65 %, and more than 70%. Also, the Bekesy audiometry is conducted on the several subject groups with normal hearing, mixed hearing loss, and sensori-neural hearing loss.

• 한국조경학회지
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• 제24권3호
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• pp.115-132
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• 1996

The purpose of this study is to estimate the soil loss amount with Geographic Information System according to the land use change of Buju mountain area in Mokpo city. To estimate the soil loss, Universal Soil Loss Equation which is the most proper technique to predict soil loss in this site condition is adopted and IDRISI, a raster GIS software, is used. GIS application with USLE is very efficient to estimate soil loss accurately and fastly. In order to decide value and to find application method of USLE factors, we used existing rainfall erosion index, soil erodibility analysis, slope length, slope steepness, vegetation management and practices, which are rated by GIS through the analysis of various studies related USLE. The result of this study was compared with the previous other researches to verify our method of constructing numerical data of USLE's factors. The result of verification of our way showed significance for the soil loss in forest area. But the result of verification for the soil loss in forest area. But the result of verification for the soil loss of cultivated area showed some errors. It seems that this result was due to local variation of topographical map.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.152-157
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• 2008

Enclosure is widely used for the sound insulation in a ship. But it is very difficult to estimate the sound insertion loss for the enclosure because the sound field between the enclosure and the machine is so complex. Therefore, it is usually estimated experimentally. In this research, sound insertion loss of the enclosure is estimated by theory assuming that the sound field in the enclosure is reverberation field. And the results from the theory are compared to those from the experiment.

• 한국환경과학회지
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• 제23권2호
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• pp.171-180
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• 2014

This study provides the empirical results of the customers' necessity and intentions of purchasing weather index insurance using survey of asking the customers' recognition about weather insurance. In this article, we discovered that not only the customers' past experience of loss but also the extent of damage and the effects that change in weather would have on their firm are positively related to an intention to purchase weather index insurance. In addition, the level of premiums was significantly higher for the highly-intended group of willing to purchase weather index insurance than the comparison group.

• 대한안전경영과학회지
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• 제8권3호
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• pp.11-25
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• 2006

It is necessary to deal with the process capability index carefully because it has been developed with certain assumptions. Companies make a decision on processes through the results obtained by using and treating data extracted from the processes. However if they have incorrect or wrong results, they cannot lead to proper outputs but also bring to loss of the competition in quality. Therefore, this study will show a method to analysis Cp (process capability ; CP) and an idea of mass-production on Pp (process performance ; PP) based on the Sigma Estimate which is one of the uncertainty in the process capability index and makes a lot of error. To apply this method, it is essential to understand and to analyze the processes exactly. Especially, it is required to establish the more accurate process capability index that can quickly and properly respond to changes on processes to recognize the small changes on the process which lies in specification in mass production system that the continual monitoring of quality managers is required.

• 품질경영학회지
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• 제42권4호
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• pp.747-756
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• 2014

Purpose: The purpose of this study is to apply the Bayesian estimation methodology for producing 'Korean Standard -Quality Excellence Index' model and prove the effectiveness of the new approach based on survey data by comparing the current index with the new index produced by Bayesian estimation method. Methods: The 'Korean Standard -Quality Excellence Index' was produced through the collected survey data by Bayesian estimation method and comparing the deviation with two results for confirming the effectiveness of suggested application. Results: The statistical analysis result shows that suggested estimator, that is, empirical Bayes estimator improves the effectiveness of the index with regard to reduce the error under specific loss function, which is suggested for checking the goodness of fit. Conclusion: Considering the Bayesian techniques such as empirical Bayes estimator for producing the quality excellence index reduces the error for estimating the parameter of interest and furthermore various Bayesian perspective approaches seems to be meaningful for producing the corresponding index.