• Title/Summary/Keyword: loss index

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Evaluation of Erosivity Index (EI) in Calculation of R Factor for the RUSLE

  • Kim, Hye-Jin;Song, Jin-A;Lim, You-Jin;Chung, Doug-Young
    • Korean Journal of Soil Science and Fertilizer
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    • v.45 no.1
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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.

Comparison of peri-implant marginal bone level changes between tapered and straight implant designs: 5-year follow-up results

  • Park, Han;Moon, Ik-Sang;Chung, Chooryung;Shin, Su-Jung;Huh, Jong-Ki;Yun, Jeong-Ho;Lee, Dong-Won
    • Journal of Periodontal and Implant Science
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    • v.51 no.6
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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.

The Relationship between Life Style and Periodontal Health Status (생활습관과 치주건강상태의 관련성)

  • Ryu, Hae-Gyum;Lee, Jung-Hwa
    • Journal of dental hygiene science
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    • v.13 no.4
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    • pp.418-425
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    • 2013
  • This study was investigated in order to provide basic data for prevention of periodontal disease and maintenance through proper lifestyle by finding the relevance of periodontal health with lifestyle habits. Data were collected from total of 326 subjects in their forties and fifties by using questionnaire and examination of periodontal health status. Results were analyzed by using IBM SPSS Statistics 19.0. The smoking status were statistically significant to gingival index (p<0.01), pocket depth (p<0.001), and clinical attachment loss (p<0.001). Smoking amount per day were statistically significant to gingival index (p<0.05), pocket depth (p<0.01), and clinical attachment loss (p<0.001). Duration of smoking were statistically significant to gingival index (p<0.05), pocket depth (p<0.01), and clinical attachment loss (p<0.001). Drinking cycle were statistically significant to gingival index (p<0.05), and clinical attachment loss (p<0.05). It is investigated that smoking (p<0.05) influence on clinical attachment loss. Dental care institute needs to make patients be aware of the fact that excessive smoking and drinking affect the periodontal health status for prevention of periodontal disease and maintenance of oral health. Therefore systematic educational programs to stop smoking and drinking should be prepared.

Development and Application of the Assessment Method of No Net Loss of Greenness for Urban Ecosystem Health Improvement (도시생태계 건전성 증진을 위한 녹지총량 평가법 개발과 적용)

  • Kim, Seung-Hyun;Kong, Hak-Yang;Kim, Tae-Kyu
    • Ecology and Resilient Infrastructure
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    • v.2 no.4
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    • pp.311-316
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    • 2015
  • This study defined and classified no-net-loss-of-greenness (NNLG) based on the law, and then assessed the NNLG index by metropolitan cities and provinces in Korea after estimating NNLG evaluation indicators for the introduction of NNLG for health improvement of urban ecosystems. The results are as follows. First, NNLG was the comprehensive meaning that was included in the greenbelt and park greenbelt and the green area which was defined by the Act on Urban Parks, Greenbelts, etc. and the National Land Planning and Utilization Act respectively. Second, NNLG was classified as a park greenbelt which was included urban parks and greenbelts such as buffer greenbelts, scenic greenbelts, and connecting greenbelts, green areas which was included in green conservation areas, green production areas, green natural areas, and green coverage which is included forests, grasslands, and wetlands that were occupied by vegetation such as trees, shrubs, and plants. Third, NNLG index by cities and provinces was assessed based on the estimation of NNLG evaluation indicators, which included parks and greenbelt areas per capita, green areas per capita, green coverage per capita, ratio of parks and greenbelts, ratio of green areas, and ratio of green coverage. As a result, Sejong city got the highest point of NNLG index and Seoul and Daegu got lowest points of NNLG index among metropolitan cities in Korea. Chungbuk got the highest point of NNLG index and Kyonggi and Jeju got lowest points of NNLG index among provinces in Korea.

Differential Diagnosis on the Types of Hearing Loss using Short Increment Sensitivity Index(SISI) Test and Bekesy Audiometry (미세증가감수지수검사와 자기청력검사를 이용한 난청 유형의 감별 진단)

  • Kim, Jin-Dong;Jeon, Gye-Rok;Wang, Soo-Geon;Shin, Bum-Joo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.22 no.8
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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.

A Study on the value decision and the application method of USLE factors for the soil loss estimation in the large scale site development area using GIS-In the Case of BuJu Mountain in MokPo City- (GIS를 이용한 대규모 단지 개발지의 토양유실량 추정을 위한 USLE의 인지값 결정과 적용 방법에 관한 연구-목포시 부주산을 대상으로-)

  • 우창호;황국웅
    • Journal of the Korean Institute of Landscape Architecture
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    • v.24 no.3
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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.

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Analysis of the Sound Insertion Loss of the Enclosure for the Chilled Water Plant in a Ship (선박의 냉수제조기용 인클로우져에 대한 음향 삽입 손실 분석)

  • Han, Hyung-Suk;Jang, Cheon-Ik
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.11a
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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.

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Analyzing the Customers' Intentions of Purchasing Weather Index Insurance (지수형 날씨보험 가입의향에 대한 분석)

  • Park, Ki-Jun;Hwang, Jin-Tae;Cho, Jae-Rin;Kim, Baek-Jo;Kim, In-Gyum
    • Journal of Environmental Science International
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    • v.23 no.2
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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.

The study on the Process Capability Index for Continuously Improvement Quality Safety (품질안전개선을 위한 공정능력지수의 연구)

  • Yang, Kwang-Mo;Oh, Sun-Il;Kang, Kyong-Sik
    • Journal of the Korea Safety Management & Science
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    • v.8 no.3
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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.

A Study on the Bayes Estimation Application for Korean Standard-Quality Excellence Index(KS-QEI) (베이즈 추정방식의 품질우수성지수 적용 방안에 관한 연구)

  • Kim, Tai Kyoo;Kim, Myung Joon
    • Journal of Korean Society for Quality Management
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    • v.42 no.4
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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.