• Journal of Sericultural and Entomological Science
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• v.10
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• pp.45-52
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• 1969

This experiment was carried out to investigate the factors causing obstructions to the productivity of mulberry field on slope land, increasing the productivity of that, in Korea. These results are summerized as follows: 1. Poor fertilization and unreasonable management due to overbalance of mulberry field in scale were proved to be most important factors of them obstructing the growth of mulberry. Therefore, it is necessary to increase the amount of fertilizer and cultivate mulberry fold in reasonable scale for the development of productivity. 2. As the direction of mulberry fold on slope land are closely related to the productivity, mulberry cultivation of the eastern or southern exposure were suitable, but that of northern not. It seemed to show no difference between the cultivation in 20 degree slope land and in less than that, 300 m above sea level and below that level. 3. A depth of top soil should be more than 60 cm. 4. Rosang in varieties of mulberry tree is not suitable but Chuwoo is comparatively suitable in slope land. 5. The number of mulberry trees in planting must be more than 900 trees per 10 ares.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.12 no.2
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• pp.191-203
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• 1992

This paper dealt with the statistical values including mean, standard deviation, variance and coefficient of variation for 14 soil parameters available of Lade's double work-hardening model in order to predict the behaviour of granular soil. 27 sets of all 14 parameters for Baekma river sand were determined by regression using raw data acquired from 12 isotropic compression tests and 9 triaxial compression tests with the variation of confining pressure of 1, 2, and $4kg/cm^2$ respectively 3 times performed during this study. The characteristics of each parameters were investigated. By determining the range of the upper and lower bound dependent on the increase and decrease of the standard deviation from mean value of parameters, sensitivity of all the parameters was scrutinized, by which in turn the influence of experimental error generated inevitably during tests on the determination of soil parameters was also examined.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.12
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• pp.1403-1413
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• 2014

Structural optimization is widely accepted in industrial fields. Structural optimization pursues improved performance of the structures. Recently, structural optimization is actively utilized due to the well-developed commercial design software systems. Three popular commercial structural optimization systems are investigated and compared. They are MSC.Nastran, Genesis and OptiStruct. The performance of the systems is analyzed based on the quality of the optimum solution and the computational time. Linear static response size, shape and topology optimizations are explored and compared with some test examples. For fair comparison, the systems are run in the same environment and the optimization parameters affecting the performance are unified. The optimization results are analyzed and the performances and characteristics of each software system are discussed.

• Journal of the Korea Organic Resources Recycling Association
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• v.26 no.3
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• pp.33-37
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• 2018

In order to recycle sewage dredging soil, we analyzed particle size distribution and organic content of dredged sewage sediments. Based on this, it was determined that particles with relatively low organic content of 1.0 mm or more could be recycled as fine aggregate. Although it was inorganic at the size of 5 mm or more, it contained a number of foreign substances other than fine aggregate, which were needed to be removed with a sieve. Since there are volatile suspended solids between 1.0 and 5.0 mm size, they were removed by means of flotation. Fine aggregate was obtained from dredging soil by screening followed with flotation method, and the proportion of fine aggregate obtained in this study was around 38 %.

• Journal of Korean Library and Information Science Society
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• v.48 no.1
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• pp.245-265
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• 2017

The objective of this research is to develop & operate classical literature reading education program for youth, to verify the difference in effect with respect to the influence of classical literature reading education on youth's character and competency development and to clarify the difference in effect depending on intention to participate in classical literature reading education and instruction method. Main result of research is summarized as follows. First, after classical literature reading education was found to be effective to the character and the youth's competency development increased. Second, verifying the effect of classical literature reading education on intention to participate voluntarily, it was found to be more effective for group of voluntary participation than group of involuntary participation. Third, verifying the effect of classical literature reading education depending on instruction method, it was found to be more effective for group of discussion lesson based on character key words than group of lesson based on recital.

• Journal of The Korean Association of Information Education
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• v.12 no.1
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• pp.41-48
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• 2008

Current performance evaluation of the natural science section mainly focuses on teacher evaluation, which causes slow feedback on the evaluation result and little evaluation on colleagues due to limits of time and space. In addition, report performance evaluation, which is a main target of the evaluation in the natural science section, is conducted mostly based on records of experiments and observation without any systematic forms. Such performance evaluation cannot meet expectation on the evaluation for a self-adjustment through instant feedback on the evaluation result and improvement of motivation through sharing common performance standard. Therefore, the study here completes an experiment/research report through information sharing and discussion among colleague learners based on the web and uses it for colleague or teacher evaluation. In addition, it is intended to recognize needs of learners and develop a performance evaluation system that can provide learners with appropriate feedback through the result.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.332-332
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• 2011

하천 유사량 특성 분석은 하천유역 내의 수리구조물 설계 및 유지관리, 하천개수 및 하도의 안정, 홍수터 관리, 저수지 설계 및 운영 등 수자원 개발 및 관리를 위한 하천계획의 필요한 요소 중 하나이며 현장 측정에서 분석까지 정밀한 일련의 과정을 통해서 알아낼 수 있다. 본 연구에서는 6개 지점(여주, 왜관, 진동, 공주, 나주, 구례2)에 대해 유사량 특성 분석을 수행하였다. 부유사량은 강우가 집중되는 홍수기(왕복수심적분법; D-74측정장비 / 표면채취법)를 중심으로 측정하였고 하상토의 경우는 Grab Sampler(60L), 선격자법 등을 이용하여 홍수기 전 후로 2회 채취하였다. 채취된 시료는 특성에 따라 여과법(부유사농도), BW관법(부유사입도분포), 체분석법(하상토입도분포)으로 분석하였으며, 이를 통해 산정된 평균 부유사농도, Oden Curve와 입도분포곡선 및 수리량(수위, 유속, 측정수심, 수면폭, 수면경사, 수온)등의 자료를 이용하여 총유사량(Modified Einstein 방법)을 추정하였다. 본 연구 결과는 다음과 같다.: 1) 유량-부유사량 및 총유사량 관계: 유량-부유사량의 관계에 있어 대체적으로 일관된 경향성이 나타났으며 총유사량과의 관계 역시 부유사량과 비슷한 경향성을 보임. 일부 성과의 경우, 총유사량과의 관계에 있어 Modified Einstein 조건의 불충족(자갈하상재료 또는 저유속)으로 부유사량과 동일추정이거나 추정불가 및 이상치가 나타남. 2) 유량-부유사량 특성: 전체적으로 루프현상을 보이며 초기 강우 사상에서는 더 많은 유사량이 발생하는데 이는 초기 강우에 의해 유사 이송이 활발하게 이루어지는 일반적인 특성임. 또한 수위 상승-하강에 따른 부유사량 자료가 더욱더 확보된다면 수위 상승과 하강부로 구분하여 분석하는 것도 의의가 있을 것으로 판단됨. 3) 유량-유사량관계식 개발: 개발된 관계식은 총유사량이 아닌 부유사량으로 개발되었으며, 측정성과들 간의 상관계수가 0.9723(구례2 지점) ~ 0.8490(나주 지점)으로 분석됨. 또한 개발된 관계식에 대한 신뢰도 분석을 실시하지 않았기 때문에 적용 시에는 주의가 요구됨.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.6558-6566
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• 2015

The purpose of this study was to examine the constituents of vocational competency affecting the professionalism of dental hygienists. The subjects in this study were 230 dental hygienists who worked in university hospitals, dental hospitals, dental clinics and public dental clinics. A survey was conducted from December, 2013, to February, 2014. To assess their vocational competency and professionalism by general characteristics, one-way ANOVA and t-test were utilized, and the level of significance was set at p<0.05. To determine what elements of vocational competency affected their professionalism, multiple regression analysis was made, and standardized regression coefficients were calculated to represent the influence of the elements. As a result, it's found that the professionalism of the dental hygienists were under the influence of their self-development skills, organizational understanding and mathematical ability. To foster self-development skills, discussion method should be utilized, and team teaching should be used to improve organizational understanding. Besides, internship and on-the-job training should be managed in a more systematic way.

• Journal of Korean Society for Geospatial Information Science
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• v.11 no.3 s.26
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• pp.55-63
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• 2003

Korean cadastral system is primarily based on the graphical maps, thus, map reproduction by excessive shrinkage or extension, map mishandling and imperfection of surveying techniques have created cadastral non-coincident areas, which caused public distrust as well as considerable difficulties in land administration and policy making. Therefore, in this study, the methodologies for the resolution of the non-coincident problem are presented by means of a comparative analysis between cases of the non-coincident areas. The non-coincidence caused by the mismatch of parcel boundaries can be settled by introducing a coordinate-based system namely ${\ulcorner}$Integrated Land Information System${\lrcorner}$, meanwhile, those by other reasons can be done by establishing and executing a plan that can deliver the unification of the cadasoal and the land registration systems. Governmental intention and budgetary measures for securing the project expenses are essential to make this feasible. If the comprehensive improvement project is completed, the cadastral registers that define the parcel boundary, area and ownership will recover public confidence, which in turn secures land owners' rights by promoting land markets and stabilizing land prices.

• Journal of Conservation Science
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• v.30 no.1
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• pp.55-65
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• 2014

On this studyed, the Wibongsa BoGwangMyungJun BaekEuiKwanEum wall-painting was conservation of Scientific research ahead. This study carried out Grain size analysis, SEM-EDS, XRD, P-XRF, FT-IR and ultrasonic exploration for wall-painting. As a result, walls layer used to mineral particles size was mixing the medium-texture and fine texture. painting layers pigments used to base paintings was ocher, white pigments was hobun, red pigments was suckganju, green pigments was suckruk. Also BackuiKannon wall-painting walls damage reason of that was long-term physical shocks. painting layers damage was include detachment or powders. it is affected by temperature and humidity. Therefore in the future conservation of wall-paintings through scientific analysis based on such data, conservation processing is performed through the preservation and enhance the stability of the paintings as a basis for the conservation of management can be utilized.