• Journal of Korean Neurosurgical Society
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• 제56권2호
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• pp.91-97
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• 2014

Objective : The purpose of this study was to evaluate demographic and clinical factors affecting the common femoral artery diameter and length, and anatomical relationship between the femoral head and the common femoral artery during angiography. Methods : We retrospectively reviewed 109 femoral angiograms. We collected the clinical data of the patients and estimated the common femoral artery diameter and length. We divided the areas in the angiogram from cephalic to caudal direction (zone 0 to 5). The lowest levels of the inferior epigastric artery loop and points of the common femoral artery bifurcation were checked. Results : The luminal diameter of the common femoral artery was $6.19{\pm}1.20mm$. Height, weight, body surface area, as well as common femoral artery diameter were significantly greater in men than in women (p<0.005). The length of the common femoral artery was $27.59{\pm}8.87mm$. Height, weight and body surface area showed strong positive relationships with common femoral artery diameter. All of the inferior epigastric artery loops were located above the center of the femoral head. The point of common femoral artery bifurcation was above the center of the femoral head in 4.59% of femoral angiograms. Conclusions : Males and patients with a high body surface area have a larger common femoral artery diameter. The cumulative probability of optimal targeting between the lowest margin of the inferior epigastric artery loop and the common femoral artery bifurcation is the highest in zone 3 puncture.

• 한국자원식물학회지
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• 제20권1호
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• pp.7-11
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• 2007

우량품종 육성을 위해 선발된 헛개나무 차대묘 20가계의 생장특성과 엽특성을 조사한 결과, 전체 평균 묘고는 61.6cm, 평균 근원직경은 6.98mm였으며, 가계별로는 KW 2-5 가계가 평균 묘고 79.3cm로 가장 우수한 생장을 보인 반면 근원직경에서는 JN 2-2 가계가 평균 9.16mm로 가장 우수한 생장을 나타내었다. 묘고와 근원직경에서 가장 우수한 생장을 보인 KW 2-5와 JN 2-2 가계는 가장 낮은 생장을 보인 가계들과 비교하여 각각 57%와 53%의 우수한 생장을 보였다. 묘고와 근원직경의 초기생장 상위 10% 가계를 선발했을 때 KW 2-5와 JN 2-2 가계가 전체 가계 평균에 비해 125%의 선발 효과를 보였으며, 상위 20% 가계를 선발했을 때 KW 2-5, JN 2-2, KW 1-1, KW 1-15 가계에서 115%의 선발효과를 나타냈다. 한편, 엽장과 엽폭, 엽병길이와 엽병직경 및 엽형지수와 측맥수 등 6항목에 대하여 엽특성을 조사한 결과, 평균 변이계수는 $9.4{\sim}42.4%$로 나타나 변이 폭이 큰것을 알 수 있었으며 특히, 엽병길이와 엽병직경 특성의 변이계수가 각각 42.4%와 28.7%로 다른 특성들에 비해 큰 값을 나타냈다. 조사된 엽특성들은 모두 가계간 유의적 차이가 인정되었으며, 엽장과 엽형지수간 상관을 제외한 모든 특성들간의 상관에서는 정의상관 관계가 인정되었고 특히, 엽장과 엽폭특성간의 상관계수가 0.8049로 나타나 두 특성간에 매우 유의적인 관계가 있는 것으로 나타났다.

• 한국농림기상학회지
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• 제10권1호
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• pp.9-16
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• 2008

입지유형별 미기후 특성이 임목생장에 미치는 영향을 구명하고자 연구 대상지의 입지유형을 사면방향, 해발고, 그리고 지형특성 등의 총 36가지 유형으로 구분한 후, 각 입지유형별 평년 기후값을 지형기후학적 방법으로 추정한 후, 평년 기후값으로부터 임목생장에 영향을 미칠 것으로 판단되는 17개 기후변수를 입지유형별로 도출하였다. 한편 입지유형별 직경생장, 수고생장, 재적생장에 대한 정보를 얻기 위해 임분조사를 실시했으며, 직경생장량, 수고생장량, 재적생장량의 추정에 적합한 회귀추정식을 17개 기후변수를 사용하여 개발하였다. 입지유형별 직경생장량은 건조지수에 의하여 최적으로 추정할 수 있었다. 건조지수는 총강수량에 대한 연 평균기온의 비에 의하여 계산되기 때문에 강수량이 많아 수분조건이 양호한 입지조건에서 직경생장이 우수한 것으로 나타났다. 한편, 수고생장량은 건조지수와 월 평균 일조시수의 두 기후변수의 조합에 의해 잘 추정되는 것으로 나타났으며, 재적생장량 추정식에 포함된 기후변수는 건조지수와 월 평균상대습도로 밝혀졌다. 결과적으로 입지유형별 직경생장, 수고생장, 그리고 재적생장을 추정하기 위해 사용한 17개 기후변수 중에서 공통적으로 건조지수가 포함되어 입지유형별 임목생장에는 수분조건이 큰 영향을 미치는 것으로 평가된다.

• 농업과학연구
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• 제39권4호
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• pp.515-523
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• 2012

Recent development and enlargement of reclaimed lands along the sea shores required to explore alternatives to existing crops, which are suitable to grow well and to declare higher profits. The objectives of this study were to investigate yield-related parameters for development of new leafy vegetables, and to screen some candidates among New Zealand spinach genotypes which were collected in Korea. Initially all the collected genotypes were grown for 7 weeks in a greenhouse of the experiment field in Chungnam National University, and then transplanted into the field to measure morphological or physiological parameters (plant height, branch number, stem diameter, chlorophyll content, and maximum canopy diameter), and yield-related parameters (leaf number, leaf length, leaf width, fresh weight and dry weight). Those parameters were quantitatively measured at 1, 5 or 9 weeks after transplanting (WAT). Parameters exhibiting statistically significant difference among the accessions were plant height, branch number, maximum canopy diameter, chlorophyll content, and leaf length. In contrast to highly correlated parameters with fresh and dry weight obtained in salt-affected soil in the earlier report, fresh weight was correlated significantly with leaf length (r=0.72), leaf width (r=0.64), and canopy diameter(r=0.66), while dry weight was correlated significantly with plant height (r=0.46), leaf length (r=0.72), leaf width (r=0.73), fresh weight (r=0.79), chlorophyll content (r=0.47), and canopy diameter (r=0.87). Based on the significantly correlated with yield parameters, the candidate accessions which were ranked in top statistical groups include CNU06A01, CNU06A13, CNU06A26, CNU06A35, CNU06A38, and CNU06A55. In order to be cultivated in reclaimed lands, it is necessary to screen out salt tolerant accessions among the above high-yielding genotypes.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1995년도 춘계학술대회
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• pp.23-26
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• 1995

The objectives of the present study are 1)to find the effect of the diameter of transpedicular screws on their fixational strength in pedicles under static pull-out loading, 2)to determine the biomechanical correlation between the pedicle diameter and the screw diameter, and 3)to find the effects of other factors in the screw design, such as materials, screw pitch, thread height and shape on their fixational strength. Biomechanical tests (Test I) were performed to evaluate the effect of the screw diameter on pull-out strength by using 60 porcine pedicls and six groups of custom-made pedicle screws with different diameters (the major and the minor diameter of the screws used in the testing varied from 4mm upto 9mm and from 3mm upto 8mm, respectively) while all other factors (materials, screw pitch, thread height and shape etc.) were fixed. In Test II, by using 61 porcine pedicles, the relationship between the ratio of the pedicle diameter and the screw diameter(=aspect ratio) of the custum-made screw and the pull-out strength of the screw was investigated. Test III was performed with 94 porcine pedicles and 8 different types of the commercial screws from 6 major productors in order to determine the effect of the screw diameter, pitch and the thread shape on the pull-out strength of the screw, respectively. The results of Test I showed that the axial pull-out resistance of the screw could be increased prportionaly to the screw diameter(P<0.05). But this increase in the pull-out resistance did not found when the screws of 4mm or 9mm in the diameter were employed. It was found from the results of Test II that the screws had its maximum pull-out resistant force when the aspect ratio ranging 40 - 69% (P<0.05). based on the results for the major diameter against the minor diameter of screw, the maximal pull-out resistance was found at 60-65% (P<0.05). According to these biomechanical testing results, it seems that the screw with a moderately large pitch is more desirable and the buttress-shaped screw can provide stronger fixation than the V-shape one can, if other designal factor and conditions were fixed.

• 한국산림과학회지
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• 제107권4호
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• pp.336-343
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• 2018

본 연구는 경사면에 분포하는 참나무류 임분의 성공적인 맹아갱신을 통한 후계림 조성 및 관리 기술 개발을 위해 수행되었다. 맹아갱신작업지의 1,451개 그루터기 높이 벌근경과 맹아발생 부위 수, 맹아 근원경 높이 등 맹아 발생과 생육에 관한 인자들을 조사하였다. 그루터기 벌근경이 커질수록 맹아발생량이 감소하거나 증가하였지만, 그루터기 높이에 따라 맹아발생량은 증가하는 경향을 보였다. 경사면 맹아갱신작업의 편의상 참나무류 임분은 사면상부 방향을 기준으로 낮게 벌채하기 때문에 사면상부와 하부 방향의 그루터기 높이차가 발생하는 것으로 파악되었다. 상대적으로 높이가 높은 사면하부 방향의 그루터기에서 맹아발생량이 많았으며, 사면하부 방향에서는 측면맹아, 사면상부 방향에서는 근부맹아 발생률이 높아 그루터기 높이차는 맹아가 발생하는 부위에 영향을 미치는 것으로 나타났다. 사면방향(상부 하부)에 따른 발생부위별 맹아 생장상태를 비교한 결과, 사면상부 방향에서는 생장량에 차이가 없는 반면 사면하부 방향에서는 측면맹아의 생장이 근부맹아 보다 높았다. 참나무류 맹아의 품질을 향상시키기 위해서는 경사면에 분포하는 참나무류 임분의 분포 특성을 고려하여 벌채면을 경사면과 평행하도록 그루터기 높이차를 줄여 측면맹아 발달을 억제하는 시업 적용이 필요하다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.515-518
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• 2005

LiDAR(Light Detection and Ranging) with digital aerial photograph can be used to measure tree growth factors like total height, height of clear-length, dbh(diameter at breast height) and crown projection area. Delineating crown is an important process for identifying and numbering individual trees. Crown delineation can be done by watershed method to segment basin according to elevation values of DSMmax produced by LiDAR. Digital aerial photograph can be used to validate the crown projection area using LiDAR. And tree height can be acquired by image processing using window filter$(3cell\times3cell\;or\;5cell\times5cell)$ that compares grid elevation values of individual crown segmented by watershed.

• 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.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.361-364
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• 2002

This paper discusses the influencing factors such as coring position, height to diameter ratio of core specimen(h/d) and coring torque on the strength estimation of concrete by small site coring method in order to verify the validities of small size core method. According to results, as for the influence of drilling position, when core specimens are obtained from the place parallel to placing direction, compressive strength of core specimens are higher than those perpendicular to placing direction. This is due to the loss of the area of core specimen perpendicular to plating direction by bleeding. And in case of $\phi$ 24mm core specimen, when vertical drilling against placing direction is taken. compressive strength of core specimen obtained at the bottom of the structure is higher than that at the top of the structure. As for the influence of height to depth ratio, as h/d ratio increases compressive strength shows to be decreased. As for the influences of rotation speed of drilling machine, as its speed goes up, compressive strength decreases, regardless of core diameter.

• The Korean Journal of Ecology
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• 제24권6호
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• pp.381-384
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• 2001

A preliminary comparative histodimensional studies, such as wood to bark ratio, total area of parenchyma cells and bast fibers, height and diameter of vascular rays, pith diameter and phenological parameters, height of the plant, perimeter of the stem, dry weight of the stem and leaves have been investigated for the low and high rubber bearing Guayule plants growing in same and different climatic regions of India. A plausible correlation is found between the percentage of rubber content and anatomical characters in the investigated varieties.