• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.30 no.2
• /
• pp.106-112
• /
• 2007

국내외의 근골격계질환에 대한 현황과 자료를 검토하였다. 국내의 자료는 지난 수년간 대학 연구소에서 수행한 유해요인조사 및 예방사업 과정에서 수집된 자료들이다. 제조업에서 서비스업에 이르는 다양한 업종의 현황을 비교하였다. 외국의 자료와 비교할 때 가장 큰 특징은 국내의 근골격계질환 자료는 발생건수에서도 실제 생산형장에서의 현황보다 축소되어져 있지만, 전체 산업재해나 직업병에서의 비율로 볼 때도 매년 그 발생 비율이 불안정하게 등락함으로서 아직도 국내의 근골격계질환의 발생비율은 여전히 정확한 현황 파악이 되지 못하고 있는 것으로 평가된다. 국내외 자료를 비교 분석한 결과 국내의 근골격계질환 현황은 외국의 평균치와 비교하여 10배 이상 저평가 되어 있는 것으로 분석된다. 또한 업종별로 평균 유병율은 적게는 5%에서 많게는 10% 이상에 이르는 것으로 추정되어진다.

• The Korean Journal of Financial Studies
• /
• v.8 no.1
• /
• pp.231-252
• /
• 2002

2000년 7월부터 채권시가평가의 실행으로 채권운용자들도 채권포트폴리오의 위험을 채권선물을 이용하여 통제하거나 감소시키기 위해 헤지를 하여야 한다. 이때 헤지비율을 추정하는 방법으로는 전통적 회귀분석모형, 백터오차수정모형(Vector Error Correction Model : VECM)과 VAR모형(Vector AutoRegressive Model)이 있다. 전통적인 회귀분석모형에 의하여 추정된 헤지비율은 시계열자료의 불안정성(nonstationary) 등으로 인하여 잘못 추정될 가능성이 있어 면밀한 검토와 분석 후 사용하여야 한다. 시계열자료의 불안정성으로 말미암아 야기되는 문제점들을 개선할 수 있는 모형으로서 VECM과 VAR모형이 널리 이용되고 있다. 따라서 본 연구는 VECM과 VAR모형을 사용하여 추정된 헤지비율과 전통적 회귀분석모형을 사용하여 추정한 헤지비율을 비교하여 어떤 모형으로 추정한 헤지비율이 더 정확한지를 평가하는데 목적을 두고 있다. 즉, 본 연구는 KTB 현 선물의 헤징에 대한 연구로 2000년 1월 4일부터 2001년 7월 27일까지 385일간의 KTB 현 선물 자료와 불룸버그 국채지수를 대상으로 VECM 및 VAR모형과 전통적 회귀분석모형에 의한 헤지비율을 추정하고 각 모형의 설명력과 예측력을 비교하고자 한다. 이 연구의 실증분석 결과, KTB 현물가격과 KTB 선물가격간, 블룸버그 국채지수와 KTB 선물가격간에는 공적분 관계가 존재하며, VECM 및 VAR와 전통적 회귀분석모형을 이용하여 추정한 최적헤지비율의 크기는 대동소이(大同小異)하며, 전통적 회귀분석방법을 이용하는 것이 VECM과 VAR모형을 이용할 때 보다 설명력과 예측력이 우월한 것으로 나타났다.

• Journal of the Korean Society for information Management
• /
• v.39 no.3
• /
• pp.51-67
• /
• 2022

The purpose of this study is to diagnose the current status of alternative materials in Korea and to suggest directions and goals for the development of alternative materials. The comprehensive list of national alternative materials and the list of popular and new books were analyzed using the collection evaluation method. Results first the percentage of alternative material collections based on the popular book list for 10 years is 90.1%. The production rate of alternative materials is low in the subjects of 'Language', 'Art' and 'Technology and Science'. Most of the service formats were 'text only daisy'. Second, the CCHR(Common Collection Holding Ratio) and CUI(Collection Uniqueness index) of alternative materials were analyzed using the union catalog. Libraries with a large volume of books have a high proportion of CCHR and CUI. Topics with the highest CCHR are 'Literature' and 'Social Science'. The subjects with the highest collection uniqueness index are 'religion', 'art', and 'language'. Third, the replacement ratio of new books for 3 years is 5.09%. During the same period, the average book purchase rate of public libraries was 8.83%. The average book purchase rate in public libraries is 8.83%, and it is necessary to increase the collection rate of alternative materials based on this ratio.

• Journal of the Korean earth science society
• /
• v.32 no.6
• /
• pp.525-536
• /
• 2011

In any applications using various types of spatial data, it is very important to account for the scale differences among available data sets and to change the scale to the target one as well. In this paper, we propose to use a geostatistical downscaling approach based on vaiorgram deconvloution and block simulation to generate fine-scale categorical thematic maps from coarse-scale fraction data. First, an iterative variogram deconvolution method is applied to estimate a point-support variogram model from a block-support variogram model. Then, both a direct sequential simulation based on area-to-point kriging and the estimated point-support variogram are applied to produce alternative fine-scale fraction realizations. Finally, a maximum a posteriori decision rule is applied to generate the fine-scale categorical thematic maps. These analytical steps are illustrated through a case study of land-cover mapping only using the block fraction data of thematic classes without point data. Alternative fine-scale fraction maps by the downscaling method presented in this study reproduce the coarse-scale block fraction values. The final fine-scale land-cover realizations can reflect overall spatial patterns of the reference land-cover map, thus providing reasonable inputs for the impact assessment in change of support problems.

• Journal of the Korean earth science society
• /
• v.30 no.7
• /
• pp.897-908
• /
• 2009

Inscriptions are integral parts of the current science textbooks, and become medium that makes sense of scientific concepts effectively. This study analyzed the inscriptions from five science textbooks at the secondary level in terms of its type, function, and structures. Analyzing types of inscriptions resulted that the ratio of frequently used photographs and illustrations were much higher than that of graphs and tables used. In case of function analysis, illustrative and complementary functions were dominant in terms of frequency and ratio, whereas explanatory, decorative and inquisitive functions were relatively rare. Inscriptions of single structure was much more than multiple structure. Multiple structure of pair and series were mainly used for representing contrast and sequence, respectively. The proportion of inscriptions in type, function and structure across the textbooks was significantly different. Based on the results, it was suggested that semiotic study about the function and the structure of inscriptions need to be carried out in earth science area to better understand the pedagogical implications of inscriptions in school science.

• The Korean Journal of Financial Management
• /
• v.13 no.1
• /
• pp.261-284
• /
• 1996

본 논문에서는 통화선물(일본 엔화와 독일 마르크화)에 대한 듀레이션 효과와 만기효과를 검증 하였다. 두 통화에 대한 1990-1994년까지의 현물과 선물의 주별자료를 가지고 분석한 결과 엔화와 마르크화의 통화선물계약에 대한 최소분산 헤지비율은 헤지기간(hedge duration)이 1주부터 5주까지 변함에 따라 증가하고 있으며 이러한 듀레이션효과는 계약만기가 가까워짐에 따라 헤지가 점점 제거되는 현상, 즉 만기효과에 의해서 영향을 받는 것으로 나타났다. 그리고 선형추세분석을 통해서 최소분산헤지비율이 베타헤지비율에 어떠한 추세로 접근하는 지를 알아보았다. 그 결과 듀레이션이 길어질수록 최소분산헤지비율이 증가하고, 계약만기에 가까워짐에 따라 최소분산헤지비율이 베타헤지비율, 1에 가까워지는 현상이 나타났다.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.4 no.1
• /
• pp.27-33
• /
• 2001

SDD(Secchi disk depth) algorithm were composed of SeaWiFS bands combination using in-water optical data sets obtained Lake Sihwa, Kyungki Bay, Chunsu Bay, and Chinhae Bay. SDD algorithm were compared with in-situ data. Reflectance band ratio, $R_{rs}$(490/665) had the highest correlation($R^2$=0.8188) with in-situ data. For in-water algorithm applied to satellite data, reflectance band ratios of Landsat TM data were calculated. However, the results of applied Landsat TM had the low correlation, these reason were discussed in this paper.

• Korean Journal of Construction Engineering and Management
• /
• v.2 no.2 s.6
• /
• pp.81-89
• /
• 2001

Construction industry has particular properties of non-continuity of production, and non-stability of market comparing to other industries. Because of them, the practical construction cost is more difficultly recognized than in manufacturing industry, so, that is various according to many projects. Therefore, it is very hard work to standardize construction cost, and it is worthy of analyzing and measuring exactly construction cost. On this study, the trouble in producing expected construction cost with original cost calculation method is progressed by the data of cost items in complete works. On the basis of analyzing data, as expected cost of practical construction is measured, it can be referred to the method and the standard of indirect labor cost rate in construction.

• Journal of Digital Convergence
• /
• v.19 no.1
• /
• pp.177-186
• /
• 2021

This study examined the effects of the firm characteristics of the manufacturing industry on the female employment ratio. Three hypotheses regarding female employment ratio, were tested for 5,729 firms that could use financial data among the firms listed on the KOSPI from 2011 to 2019, in terms firm size, listing period, and foreign ownership. Follwing the analyses, three hypotheses were mostly adopted. It was found that as the size firm and foreign ownership ratio increased, the female employment ratio increased in the number of regular and permanent contract employees, fixed-term employees, and total employees. As for the listing period, the higher the value, the lower the female employment ratio in the number of regular and permanent contract employees, fixed-term employees, and total employees. These research results may be used as basic data for gender equal employment policies such as Affirmative Atcion for Gender Equal Employment.

• Agrochemical news magazine
• /
• v.25 no.2 s.195
• /
• pp.14-17
• /
• 2004