• 한국작물학회지
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• 제19권
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• pp.83-99
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• 1975

우리나라에서의 섬유용 아마의 육종 목표와 관련된 육종상의 기초적 문제를 구명하고 답전작 섬유용 아마육종사 필요한 정보를 얻기 위하여, 도입된 4개품종의 이면교잡 잡종집단에 관하여 개화시까지의 일수, 초장, 경장, 건경중등 양적형질의 유전양식, 유전력 및 그들의 지역적 변이에 관한 시험을 하였다, 그 결과를 요약하면 다음과 같다. 1. 개화시까지의 일수는 짧은 것이 긴것에 대하여 완전 우성으로 나타났다. 2. 초장과 경장은 짧은 것이 긴것에 대하여 부분 우성으로 나타났다. 3. 건경중은 비대립유전자 간의 상호작용으로 분명치 않으나 무거운 것이 가벼운 것에 대하여 열성으로 나타났다. 4. 개화기간, 건경중 및 섬유비율의 유전력은 대체로 높았고 개화일수, 경장 및 섬유중의 유전력은 대체로 높았고 개화일수, 경장 및 섬유중의 유전력은 비교적 낮게 나타났다. 5. 섬유수량과 건경중 그리고 건경중과 초장간에는 높은 정의 상관을 보였다. 6. 섬유수량과 섬유비율, 섬유수량과 개화기간, 초장과 개화기간 중에는 각각 부의 상관이 있었다. 7. 초장($X_1$), 건경중($X_2$) 및 섬유중( $X_3$ ) 의 3개형질을 고려한 선발지수의 이용이 가장 능률적이었으며 이때의 각형질의 선발지수는 0.002$X_1$+0.0047$X_2$+0.0181$X_3$였다. 8. 선발시 고려되는 형질중 유전획득량과 선발효율을 가장 높일 수 있는 형질은 초장이었다. 9. 조사된 형질들은 모두 지역간 차가 현저하고 유전형 대 지역의 교호작용도 유의한 경우가 많았다.

• 대한원격탐사학회지
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• 제21권4호
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• pp.303-316
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• 2005

연안의 굴 양식장은 레이더 영상에서 강한 산란체로 나타나며, 긴밀도 높은 레이더 간섭쌍을 제공한다. 굴 양식장에서 일어나는 강한 신호의 간섭위상과 반사강도를 이용하여 조위를 관측하는 방법이 개발된 바 있다. 레이더를 이용한 조위 측정방법은 이중 반사가 일어나는 굴 양식장에서 적용되어야 한다. 이 논문에서는 굴 양식장 구조물에서 일어나는 산란의 특징을 분석한다. 실내실험은 다중편파 Ku-밴드를 이용하여 전파암실에서 축소된 산란체를 제작하여 수행하였다. 산란체의 수직막대로부터 돌아오는 신호는 수평 막대로부터 돌아오는 신호보다 10.5 dB정도 강하게 나타났다. 단일 반사 성분은 이중 반사 성분과 유사한 정도로 큰 값을 나타냈으나 안테나의 관측방향에 매우 민감하였다. 또한 수직막대의 높이가 증가함에 따라 이중 반사 성분이 비례하여 증가하였고, 이중 반사 성분이 조위관측에 더 유용하게 이용될 수 있음을 확인하였다. L-밴드 AIRSAR 영상을 단일 반사와 이중 반사, 체적산란으로 분류하였다. 그 결과 굴 양식장에서는 항상 이중 반사만이 일어나고 있는 것은 아닌 것으로 나타났다. 해수면 위로 노출된 굴 양식장에서는 이중 반사가 우세하게 일어나지만, 조위가 낮아 바닥의 조간대 면이 공기 중에 노출되면 단일 반사 성분이 주요 산란 특징으로 나타났다. 전자의 경우 단일 반사와 이중 반사의 비율은 0.46인 반면, 바닥면이 노출된 경우에는 이 비율이 5.62로 급격히 증가하는 것을 알 수 있다. DInSAR 기술을 이용한 조위 관측을 위해서는 이중 반사가 우세하게 일어나는 지역을 선정하여야한다.

• Water Engineering Research
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• 제5권4호
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• pp.195-206
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• 2004

This paper deals with oxygen transfer by air entrainment and energy dissipations by flow characteristics at the stepped drop structure. Nappe flow occurred at low flow rates and for relatively large step height. Dominant flow features included an air pocket, a free-falling nappe impact and a subsequent hydraulic jump on the downstream step. Most energy was dissipated by nappe impact and in the downstream hydraulic jump. Skimming flow occurred at larger flow rates with formation of recirculating vortices between the main flow and the step comers. Oxygen transfer was found to be proportional to the flow velocity, the flow discharge, and the Froude number. It was more related to the flow discharge than to the Froude number. Energy dissipations in both cases of nappe flow and skimming flow were proportional to the step height and were inversely proportional to the overflow depth, and were not proportional to the step slope. The stepped drop structure was found to be efficient for water treatment associated with substantial air entrainment and for energy dissipation.

• 한국연초학회지
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• 제9권1호
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• pp.45-55
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• 1987

For some basic information in tobacco breeding, the modes of inheritance and heritabilities for the twelve agronomic and chemical characters were estimated in the study of eight varieties partial diallel set. Additive gene actions were significant for all characters except total nitrogen content and dominance gene effects were also significant for all characters. Yield, number of leaves per plant, leaf length and leaf shape index were inherited as partial dominance, and overdominance was detected for plant height, stem diameter, internode length, total alkaloid, total nitrogen and total sugar content. Dominant gene showed increasing effects in yield, plant height, stem diameter, internode length, leaf width and total sugar content, but showed decreasing effects in the other characters. The broad heritability was very high for all characters. and the narrow heritability was high in days to flower and yield, but low in internode length, total alkaloid, total nitrogen and total sugar content.

• 설비공학논문집
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• 제12권4호
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• pp.388-397
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• 2000

Comparison of the heat conduction into a trapezoidal fin and the heat loss from the fin by convection is made in this study Also, the ratio of heat loss from each surface to the total heat loss and the temperature distribution are analyzed using a 3-D analytical method. A trapezoidal fin whose tip height is half the root height is chosen as the model. The results show that the heat transfer rates from the tip and from both sides are comparable with each other as the non-dimensional width and length vary while the heat transfer rate from the bottom and top is dominant.

• The Korean Journal of Ecology
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• 제1권1호
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• pp.11-16
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• 1977

The vertical distribution of the corticolous lichens in Mt. Sobaeg was detected by 10cm point quadrat. The dominant species of lichens was arranged in a single dimensional ordination along the elevational gradient with the frequency percentage of the species. Cetraria stracheyi, Parnaria leucosticta, Stieta platyphyll and Parmelia petusa were found in order of abundant from lower, Samgadong(400m) to higher, Birobong(1439m) in which they occurred mainly on the southwest slope. However, such species as Cetraria juniperina was more abundant than Parnaria leucosticta and Stieta platyphylla at the southeast slope. The distribution of Cetraria Stracheyi and Parnaria leucosticta was limited below 1200m height, while Parmelia petusa and Cetraria juniperina mostly above 900m height.

• 설비공학논문집
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• 제2권3호
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• pp.208-217
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• 1990

A rectangular test section is devised by assuming two dimensional melting of a solid phase change material heated from two sides which are maintained at constant temperature and allowing a free expansion due to density difference between solid and liquid. The timewise melting shape is recorded photographically by the shadow graph method for several experimental conditions. The analysis shows that the melting process consists of four regimes. At first, the pure conduction heat transfer is dominant, and as time goes by natural convection grows and plays a role greatly. Experiments are carried out varying not only the wall temperature but height of the wall. Each effect of them on the melting process is obtained in the form of combination of dimensionless parameters, $Ste^{0.8}\;FoRa^{0.2}$. An algebraic correlation is suggested, which predicts the melted fraction well.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.54-61
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• 2004

This paper deals with flow characteristics on the air entrainment and the energy dissipation in nappe flow over the stepped drop structure. Nappe flow occurred at low flow rates and for relatively large step height Dominant flow features include an air pocket, a free-falling nappe impact and a subsequent hydraulic jump on the downstream step. Air entrainment occurred from the step edge, through a free-falling nappe impact and a hydraulic jump. Most energy was dissipated by nappe impact and in the downstream hydraulic jump. It was related with the step height and the overflow depth, but not related with step slope. The stepped drop structure was found to be effcient for water treatment and energy dissipation associated with substantial air entrainment.

• 복식문화연구
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• 제7권1호
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• pp.38-51
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• 1999

For a ideal construction of shoes, the exact analysis for shape and size of foot is necessary. This study was performed to classify and analyze the foot types of young males and females. For this, methods of cluster analysis, correspondence analysis and value of proportion were used. The subjects were 414 college students and 36 items, weight(1 item), height(8 items), length(6 items), breadth(6 items), girth(7 items), depth(3 items), slope(5 items) on foot were measured. The fundamental results of the study were as follow ; Difference in foot shape between men\`s and women\`s feet was not found below ankle girth. Based on cluster analysis the shapes of foot were classified into five groups, small but relatively slim group, small but relatively barrel group, middle group, large but relatively slim group and large but relatively barrel group. The types of foot had the distinguished dominant characteristics according to sex, weight and height. The results of this study show that there must be the suitable design of shoes for each foot type.

• 한국지구과학회지
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• 제40권5호
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• pp.487-501
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• 2019

In this study, steric height variability in the East Asian Seas (EAS) has been analyzed by using ocean reanalysis intercomparison project (ORA-IP) data. Results show that there are significant correlations between ocean reanalysis and satellite data except the phase of annual cycle and interannual signals of the Yellow Sea. Reanalysis ensemble derived from 15-different assimilation systems depicts higher correlation (0.706) than objective analysis ensemble (0.296) in the EAS. This correlation coefficient is also much higher than that of the global ocean (0.441). For the long-term variability of the thermosteric sea level during 1993-2010, a significant warming trend is found in the East/Japan Sea, while cooling trend is shown around the Kuroshio extension area. For the halosteric sea level, a dominant freshening trend is found in the EAS. However, below 300 m depth around this area, the signal-to-noise ratio of the linear trend is generally less than one, which is related to the low density of observation data.