• 한국농공학회지
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• 제16권2호
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• pp.3438-3453
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• 1974

Unmeasured value of water for human lives is widely approved, but the water as one of natural resources cannot be evaluated with ease since it changes itself ceaselessly by flowing-out or transforming the phase. Major objectives of the study concerned consequently with investigating its potentiality and evaluating its time seriesly availabity in a volumatic unit. And the study was performed to give the accurate original data to the planners concerned. Some developed rational methods of predicting runoff related to hydrological factors as precipitation, were to be discusseed for their theorical background and to be introduced whether they needed some corrections or not, comparing their estimation with actual runoff from synthetic unit-hydrograph methods. To do so, the study was performed to select Kongju Station, located at the watershed of the Keum River, and to collect such hydrological data from 1962 to 1972 as runoff, water level, precipitation, and so on. On the other hand, the hydrological characteristics of runoff were concluded more reasonably in numerical values, with calculating the the ratio of daily runoff to annual discharge of the flow in percentage, as. the distribution ratio of runoff. The results of the study can be summarized as follows; (1) There needed some consideration to apply the Kajiyama's Formula for predicting monthly runoff of rivers in Korea.(2) The rational methods of predicting runoff might be recommended to become less theorical and reliable than the unique analyzation of data concerned in each given water basin. The results from the Keum River prepared above would be available to any programms concerned. (3) The most accurate estimation for runoff could be suggested to synthetic unithydrograph methods calculated from the relation between each storm and runoff. However it was not contained in the study. (4) The relations between rainfall and runoff at KongJu Station were as following table. The table showed some intersting implications about the characteristics of runoff at site, which indicated that the runoff during three months from July to September approached total of 60% of quantity while precipitation concentrated on the other three from June to August. And there were some months which had more amount of runoff than expected values calculated from the precipitation, such as Febrary, March, August, September, Octover, and December, shown in the table. Such implications should be suggested to meet any correction factors in the future formulation concerned with the subjects, if any rational methods would be required.

• 한국지반환경공학회 논문집
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• 제14권1호
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• pp.15-22
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• 2013

강원도 인제지역의 토석류 사방시설 유형에 따른 준설 및 퇴적특성을 알아보기 위하여 불투과형 및 투과형 사방댐을 각각 5개소를 선정하고 선정된 사방댐에 대한 퇴적특성 및 지하수위 분포에 대한 현장조사와 지역 내에 분포하는 51개 사방시설에 대한 유역면적, 저장능력, 준설량 등의 자료를 분석하였다. 현장조사 결과 불투과형 사방댐은 평상 시 대규모 토석류가 발생하지 않았음에도 불구하고 퇴적물이 쌓여있어 대규모 토석류 발생 시 사방댐 저장능력이 작아질 수 있음을 나타내었다. 불투과형 사방댐의 평상 시 수위는 퇴적토의 지표에 위치하여 배수가 원활하게 이루어지지 않을 수 있으나, 투과형 사방댐 수위는 버트리스 부분 하단에 존재하여 큰 강우에서도 사방댐으로 인하여 지반 포화를 발생하지 않을 것으로 나타났다. 또한, 사방시설의 저장능력과 유역면적, 준설량의 상관성 분석결과, 사방시설의 설치에 있어 유역면적에 따른 사방시설의 규모가 잘 반영되지 않았으며 큰 사방댐 시설을 건설하였으나 실제 퇴적량은 작게 나타나 향후 효율적인 사방시설의 계획 및 시공이 이루어져야 할 것으로 나타났다.

• 한국광물학회지
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• 제21권4호
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• pp.383-395
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• 2008

필리핀 만카얀 지역의 빅토리아 광산에서 입수한 금 은 광석으로부터 금 은 성분의 회수율을 높이기 위해 지질 및 광물학적 특성, 금과 은의 수반상태, 파 분쇄에 따른 단체 분리도, 체 분리에 의한 분립 특성과 요동테이블에 의한 비중 선별 특성을 연구하였다. 필리핀산 금 은 광석은 황철석, 섬아연석, 방연석 등의 황화광물과 석영 및 점토 등의 맥석 광물로 구성되었다. 금 은 성분은 황철석, 섬아연석, 방연석 등의 황화광물에 주로 수반되어 있었다. 황화광물 결정의 크기는 $100{\mu}m$에서 $1{\mu}m$ 이하까지 광범위한 입도분포를 갖기 때문에 금 은이 수반된 황화광물의 단체분리도를 높이기 위해서는 금 은 광석을 최소한 $100{\mu}m$ 이하로 매우 작게 분쇄해야 하는 것으로 나타났다. 금 은 광석을 Jaw crusher $\to$ cone crusher $\to$ rod mill 등으로 단계적으로 파.분쇄하여 입도($d_{90}$)를 $100{\mu}m$ 이하로 조절하면 단체분리도가 92% 정도까지 높아졌다. 금 은 성분이 함유된 황화광물의 결정이 $100{\mu}m$ 이하의 입단에서 고르게 분포되어 있기 때문에 체질에 의한 분립 방법으로는 금 은을 수반한 황화광물을 선택적으로 분리하여 회수할 수 없었다. 파 분쇄한 금 은 광석을 체로 분립한 후 요동테이블로 비중 선별한 결과, 정광에는 황화광물이 주로 농축되어 금과 은의 품위가 각각 40 ppm 및 140 ppm까지 높아졌다. 이때 정광의 금 실수율은 거의 100%에 이르지만, 은 실수율은 50% 수준에 불과하였다.

• 한국수자원학회논문집
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• 제52권9호
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• pp.615-626
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• 2019

토양수분과 유출은 매우 밀접한 관계를 가지고 있으며, 특히 토양 내의 여러 요소들에 의해 토양의 수분보유능력과 배수의 특성이 결정된다. 본 연구에서는 2016년, 2017년 설마천 유역에서 총 40개의 사상을 분리하였다. 선정한 사상별로 constant-K 방법을 적용하여 직접유출과 기저유출을 분리하고 유출계수를 산정하였다. 산정된 유출계수는 선행토양함수와 지수함수 형태의 증가를 보였다. 또한 유출계수가 급증하기 시작하는 토양수분의 임계값을 선정하였으며, 이 값은 유출과 지하수면과의 큰 상관관계를 나타내었다. 선행토양함수뿐만 아니라 초기 토양수분, 토양 저류량, 강우량 등 여러 인자들도 유출 결과에 영향을 미치는 것으로 분석되었다. 또한 선행토양수분의 임계값에 따라 강우사상을 건조, 습윤 상태로 분리하여 시작 반응과 첨두 반응을 분석해 보았으며, 습윤 상태에서의 반응이 건조 상태에서 보다 빠르게 발생하였다. 건조 상태에 속하는 대부분의 사상에서는 토양수분이 정점에 도달한 후 지하수면과 유출량 순으로 정점에 도달하는 첨두 반응이 일어났으나 습윤 상태에서는 반대로 지하수면과 유출량이 토양수분보다 먼저 정점에 도달하였다. 본 연구의 결과는 유출에 기여하는 인자들 사이의 상호작용을 확인하고 토양의 다양한 조건과 유출 사이의 관계를 규명하는 데에 크게 기여할 것으로 판단된다.

• 한국의류학회지
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• 제22권4호
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• pp.503-514
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• 1998

The purpose of this study was to develop a large representative data base for jeans marketing strategy This study was to survey brand features(launching year, launching company, design concept, sales volume, and price zone) in the current market, and was to examine brand awareness and it's relationship to segmented distribution regions, demo- graphic variables(sex, age, monthly household income, and seasonal clothing expenditure). This study was also to analyze brand image and consumer's seeking image. The 660 questionnaires were distributed and 618 reliable ones were used for statistical analysis. A SAS statistical package including frequency table, Chi-square test, factor analysis, analysis of variance(ANOVA), Duncan's multiple range test and paired-t test was used. The results are as follows: 1. Brand awareness involves "brand recall" based on asking a person to name the brand recalled first, and "brand recognition" based on asking to identify brand name from 30 given brands. The result of recall brand test indicated that Levi's was dominant brand. People recognized about 70.8% of brands on the average. Brand recognition was influenced by segmented distribution region and demographic variables. 2. There was significantly positive relationship between brand recognition and purchasing behavior. 3. National brands were more recognized than Licensed brands. 4. The result showed that "Nix" was best represented for sophisticated brand image, "Strom" for characteristic, "Jambangee" for resonable price, and "Levi's" for classic '||'&'||' comfortable brand image. 5. As a result of factor analysis on consumer's seeking image, six factors(characteristic, young, intelligent/sexy, comfortable, exotic and popular) were found. Several factors had a relationship with preferred design, demographic variables, fashion interest, and brand recognition. variables, fashion interest, and brand recognition.

• 대한한의학원전학회지
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• 제30권1호
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• pp.1-15
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• 2017

Objectives : Ge Songping(戈頌平) was a medical doctor in Qing Dynasty during the late $19^{th}$ century who annotated the original texts of four medical classics and wrote Suwenzhigui (素問指歸), Shanghanzhigui(傷寒指歸), Jinkuizhigui(金匱指歸), and Shennongbencaojingzhigui (神農本草經指歸). This paper's objective is to compile information about his writings, and shed a light on the unique characteristic of his scholarly works. Methods : Information regarding Ge Songping's life has been gathered through existing research papers and the sources revealed in the introduction. His works were divided into different formal characters as listed in part of the introduction and in the table of contents. Contents related to Yinyang(陰陽) found in Suwenzhigui were studied in order to discover his unique scholastic character. After selecting and analyzing three texts related to Yinyang, some characteristic terms and emphasized contents were studied. Results : The review yielded knowledge about Ge Songping's life, the times of his publications, the meanings of the names of his books, and basic information abou them. In terms of his scholarstic works, he used the ideas he gained from Shanghanlun(傷寒論) to form his medical theory, and used this to write annotations for four types of medical classics. The features of his theory of Yinyang can be divided into four categories. First, he coined the term Qiye(氣液) to bring contrast between yinyang as yinye(陰液) and yangqi(陽氣). Second, he shaped the temporal and spatial structure of the circulation of yinyang based on Shierdizhi(十二地支). Third, he explained the relationship between yin and yang while mainly focused on yangqi. Fourth, he explained the physiology and pathology mechanisms while focused on the circulation of ascending and descending and the idea of mutual beneficiary.

• 한국소음진동공학회논문집
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• 제14권12호
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• pp.1322-1329
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• 2004

End-milling has been used widely in industrial system because it is effective to a material manufacturing with various shapes. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in precision machine part and electronic part. The optimum mechanical vibration of main spindle, surface roughness and cutting temperature have an effect on end-milling condition such as, cutting direction, revolution of spindle, feed rate and depth of cut, etc. Therefore, this study carried to decide the working condition for optimum mechanical vibration of main spindle, surface roughness and cutting temperature using design of experiments, ANOVA and characteristic function. From the results of experimentation, mechanical vibration has an effect on revolution of spindle, radial depth of cut, and axial depth of cut. The surface roughness has an effect on cutting direction, revolution of spindle and depth of cut. And then the optimum condition used design of experiments is upward cutting In cutting direction, 600 rpm in revolution of spindle, 240 mm/min in feed rate, 2 mm in axial depth of cut and 0.25 mm in radial depth of cut. By design of experiments and characteristic function, it is effectively represented shape characteristics of mechanical vibration, surface roughness and cutting temperature in end-milling.

• 한국항공우주학회지
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• 제33권6호
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• pp.21-30
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• 2005

헬리콥터 로터 블레이드 예비설계 단계에서 에어포일 선정과 분포의 기초 자료를 생성하기 위해 로터 에어포일 공력해석을 수행하였다.기존 헬리콥터의 에어포일 중 공력해석 대상으로 10개를 선정하고 블레이드 요소이론을 이용한 공력해석에 적합한 table 형태의 공력계수 자료를 생성하였다. 해석 비용을 고려, 풍동시험 대신 간단한 수학적 모델을 이용하여 모든 받음각 영역($-180^{o}\sim180^{o}$)에서 공력특성 곡선($C_{l},C_{m},C_{d}$)을 구성하였다. 공력특성곡선 구성에 필요한 각 에어포일의 필수 공력자료를 IBLM을 이용하여 구하였으며, 구성된 공력특성곡선은 실험결과와 정성적으로 일치하였다. 마지막으로, 에어포일 선정과 분포설계의 기준을 마련하기 위하여 각 에어포일의 양력계수, 모멘트계수를 상호 비교한 후 분류하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.75-85
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• 2006

In recent geotechnical engineering, geothermal approach has been on the horizon to deal with geoenvironmental issues, freezing and thawing problems, and seepage phenomenon in dams and embankments. In this study, geothermal characteristic through inner body of dams and its influence on the seepage flow were experimented by lab test and field instrumentation. Also, one of up-to-date temperature monitoring technique, called as multi-channel thermal line sensing, was evaluated its availability. As a result of lab test, it is found that the seepage flow has influence on the geothermal characteristic and a potential of finding phreatic line and seepage fluctuation could be possible by continuous temperature monitoring using thermal line sensing skills. These kine of geothermal information could be available to the modelling of water geo-structure interaction. Out of short-term field tests, clear water table and temperature distribution of a dam were easily found through temperature monitoring in holes located near a reservoir and holes within a depth of constant temperature layer. However, it is also found that the geothermal flow and finding seepage line could not be easily understandable through multi-channel temperature monitoring because of the existence of constant temperature field, thermal conductivity of soils and rocks, and unsaturated characteristics of geo-material. In this case, long-term geothermal monitoring is recommended to find sudden fluctuation of seepage line and amount of leakage.

• 한국지반환경공학회 논문집
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• 제9권5호
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• pp.61-69
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• 2008

일반적으로 암반사면의 안정성을 평가하는 방법으로는 평사투영해석, 한계평형해석, 수치해석, 안정성 평가표에 의한 방법 등 여러 가지 방법이 이용되고 있다. 이 중 안정성 평가표에 의한 방법은 평가법의 제안기관이나 자국의 특성에 따라 그 평가항목이 상이하며, 또한 안정성 평가표상의 개개의 평가항목에 대한 연구는 미흡한 실정이다. 본 연구에서는 315개소의 고속도로 암반사면 분석자료를 이용하여 일반적으로 사용되고 있는 암반사면의 안정성 평가항목중 기하학적 형상(사면높이, 사면경사 및 경사방향, 주불연속면의 경사 및 경사방향, 사면과 주불연속면의 방향차이) 및 지형학적 특성(지형의 집수가능성, 상부자연사면 경사, 사면형상)에 대한 이상치(abnormal value) 분석을 통하여 암반사면 안정성 평가항목의 유효성을 평가하였다.