• 한국연초학회지
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• 제14권1호
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• pp.24-32
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• 1992

The present study was conducted to compare the relative efficiency of two different haploid breeding methods in tobacco varietal development. A single F t hybrid plant from cross of two flue-cured cultivars of Nicotiana tabacum L., Bright Yellow4(BY4) and NC 95, was used to develop the 30 dihaploid lines by anther culture(F1-ADH) and maternally-derived doubled haploid utilizing Nicotiana africana(F1-MDH), respectively. As compared with mid-parent, ADH lines showed increasing in number of leaves, delaying in days to flower and narrowing in leaf width. However, no significant differences in the other characters investigated were recognized. MDH lines also showed narrow leaf width, while no significant differences in the other characters were observed. The variations of the characters investigated were generally greater in ADH than MDH lines. MDH lines had higher plant height and shorter days to flower than ADH lines, while other characters did not show remarkable differences. The degree of heritability for each of the characters observed between ADH and MDH was almost the same. The characters showing high heritability value were plant height, leaf number, days to flower, and yield, while those showing relatively low value were leaf length, leaf width, and total alkaloid content. Predicted gains from selection for increased yield were calculated for both populations(F1-ADH, F1-MDH) and correlated responses associated with selection for yield were estimated. Plant height, leaf width, days to flower, percent reducing sugar and disease resistance would be expected to improve with selection for yield much faster in the MDH population than in the ADH.

• Advances in concrete construction
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• 제6권3호
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• pp.269-283
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• 2018

This study presents the effects of geometrical dimensions of concrete gravity dams on the seismic response considering different base width/dam height (L/H) ratios. In the study, a concrete gravity dam with the height of 200 m is selected and finite element models of the dam are constituted including five different L/H ratios such as 0.25, 0.5, 0.75, 1.00, 1.25. All dams are modeled in ANSYS software considering dam-reservoir-foundation interaction. 1989 Loma Prieta earthquake records are applied to models in upstream-downstream direction and linear time history analyses are performed. Dynamic equilibrium equations of motions obtained from the finite element models of the coupled systems are solved by using Newmark time integration algorithm. The seismic response of the models is evaluated from analyses presenting natural frequencies, mode shapes, displacements and principal stresses. The results show that the L/H ratios considerably affect the seismic response of gravity dams. Also, the model where L/H ratio is 1.00 has more desirable results and most appropriate representation of the seismic response of gravity dams.

• 동의생리병리학회지
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• 제21권6호
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• pp.1601-1610
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• 2007

The purpose of this study was to determine whether a pulse analyzer was useful 1) to characterize the variables of pulse wave of diabetes mellitus group, compared with those of healthy subjects, and 2) to determine Sasang Constitution in diabetes mellitus group and healthy subjects. 1. The sum of pulse pressure (energy) and the ratio of systolic period area (As%), called pulse pressure-related variables, were higher in diabetes mellitus group than healthy group, while the height of dicrotic wave (h5) and the ratio of height of dicrotic wave to height of percussion wave (h5/h1), correlated with arterial compliance, were lower in diabetes mellitus group than healthy group. 2. Taeumin of diabetes mellitus group showed higher pressure-related variables than that of healthy group. 3. Soumin of diabetes mellitus group had shorter the time to dicrotic wave (t5) than that of healthy group. 4. Soyangin of diabetes mellitus group showed higher heart rates and lower values in pulse wave time-related variables, including time to dicrotic wave(t5), time to incisura (t4), total time minus time to incisura (t-t4), total time (t), width of percussion wave (w), and the ratio of width of percussion wave to total time (w/t), than that of healthy group. 5. Contact pressure (CP), sum of pulse pressure (energy), height of pre-incisura (h2), height of incisura (h4), width of percussion wave (w), time to incisura (t4), time to percussion wave (t1), variance of total time (Vt), variance of height of percussion wave(Vp) and the ratio of height of incisura to height of percussion wave (h4/h1) were used to develop the rules of Sasang Constitution Classification with about seventy five percents accuracy. These suggested that the pulse analyzer was useful to evaluate the risk degree of diabetes mellitus and to determine Sasang Constitution among either diabetes mellitus group or healthy group.

• 한국의상디자인학회지
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• 제13권4호
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• pp.79-91
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• 2011

This study divided school age by considering a change in the stage of body growth by age in elementary schoolgirls with the use of body scan data, and considered by comparing body size characteristics by school age. Elementary schoolgirls' body shape cannot be divided clearly. However, ages 7-10 were bound into the same group for the majority of girth, width, and thickness items. 7-8 years old, 9-10 years old, and 11-12 years old were bound into the same group in most items except ages 9 and 10 for the height item. Thus, significant difference was indicated between groups. Accordingly, this study divided the school age into three periods such as early stage(ages 7-8), middle stage(ages 9-10), and late stage(ages 11-12) in consideration of the stages for elementary schoolgirls' body-shape growth. As a result of analyzing body size according to division of school age, the higher school age leads to continuous growth. The notable growth was indicated especially in the middle stage and late stage. Examining centering on typical items related to the clothing construction, there was notable increase in waist thickness and hip thickness between early and middle stages and in height, weight, breast girth, waist circumference, back length, breast width, and waist width between middle and late stages. On the other hand, hip circumference, hip width, breast thickness, and length between shoulder edges were indicated to grow relatively and evenly among early, middle, and late stages. The lateral form was shown a clear difference in the forms of early, middle, and late stages in height and length of the whole body shape and in side thickness. The early and middle stages belong to body shape that abdomen is projected to be curved. The late stage showed right body shape which is straight and stable form in posture.

• Journal of Korean Neurosurgical Society
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• 제60권5호
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• pp.504-510
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• 2017

Objective : To investigate the morphological and hemodynamic parameters associated with middle cerebral artery (MCA) bifurcation aneurysm rupture. Methods : A retrospective study of 67 consecutive patients was carried out based on 3D digital subtraction angiography data. Morphological and hemodynamic parameters including aneurysm size parameters (dome width, height, and perpendicular height), longest dimension from the aneurysm neck to the dome tip, neck width, aneurysm area, aspect ratio, Longest dimension from the aneurysm neck to the dome tip (Dmax) to dome width, and height-width, Bottleneck factor, as well as wall shear stress (WSS), low WSS area (LSA), percentage of LSA (LSA%) and energy loss (EL) were estimated. Parameters between ruptured and un-ruptured groups were analyzed. Receiver operating characteristics were generated to check prediction performance of all significant variables. Results : Sixty-seven patients with MCA bifurcation aneurysm were included (31 unruptured, 36 ruptured). Dmax (p=0.008) was greater in ruptured group than that in un-ruptured group. D/W (p<0.001) and the percentage of the low WSS area ($0.09{\pm}0.13$ vs. $0.01{\pm}0.03$, p<0.001) were also greater in the ruptured group. Moreover, the EL in ruptured group was higher than that in unruptured group ($6.39{\pm}5.04$ vs. $1.53{\pm}0.86$, p<0.001). Multivariate regression analysis suggested D/W and EL were significant predictors of rupture of MCA bifurcation aneurysms. Correlation analyses revealed the D/W value was positively associated with the EL (R=0.442, p<0.01). Conclusion : D/W and EL might be the most two favorable factors to predict rupture risk of MCA bifurcation aneurysms.

• 한국수산과학회지
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• 제4권3_4호
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• pp.92-98
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• 1971

부산 항만내 영도 앞바다에서 1967년 9월부터 1968년 10월까지 사이에 채집된 개조개에 대해 비만도와 수은의 계절적인 변화와, 각장과 전중량, 각고와 전중량, 각장과 각폭, 각고와 각폭의 관계를 조사했다. 비만도의 변화는 수온의 변화와 관계를 가지고 있으며, 생식소 발달 과정과 깊은 관계를 가지고 있어 3월 이후 5월까지 점점 높은 값을 보였고, 고온인 8월에는 비만도는 오히려 일시적인 낯아짐을 보였다. 주산란기인 8월하순부터 10월 중순까지 사이에 비만도의 값은 연중 최고값을 보이고, 이후 낮아짐을 볼 수 있었다. 수온이 차츰 낮아져 $10^{\circ}C$ 이하로 되는 $1\~2$월에는 비만 속도는 연중 최소값을 보였다. 각장과 전중량 $$W=0.4749L^{2.62307}$$(수), $$W=0.3438L^{2.77993}$$(암) 각고와 전중량 $$W=0.3221L^{3.06661}$$ 각폭과 전중량 $$W=3.5868L^{2.46646}$$과 같은 곡선식을 보였고, 각장자 각고 Y=0.818x+0.292 (상관계수 r=0.958) 각장과 각폭 y=0.520x+0.200(상관계수 r=0.799)각고와 각폭 y=0.499x+0.516 (상관계수 r=0.773)과 같은 직선을 보였다.

• 대한치과교정학회지
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• 제33권2호
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• pp.73-84
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• 2003

본 연구는 정모두부방사선사진 촬영시 수직적 두부회전이 방사선사진상의 계측치들에 어느 정도의 투사오차를 야기 시키는지 알아보고자 시행되었다. 임상검사를 통하여 두드러진 전후방 골격이상이나 뚜렷한 안면비 대칭을 보이지 않는 성인 25명을 대상으로 natural head position상태를 기준위치$(0^{\circ})$로 정하고 이 위치에 대해 양쪽 ear rod를 연결한 수평축을 중심으로 두부를 상, 하방으로 $5^{\circ},\;10^{\circ}$씩 회전시킨 상태에서 정모두부방사선사진을 각각 촬영하여 투사도를 작성한 다음 7개의 고경항목, 5개의 폭경항목, 6개의 각도항목을 계측하였다. 각 회전각도에서의 계측치를 비교 분석하여 다음과 같은 결과를 얻었다. 1. 고경계측항목의 투사오차가 폭경이나 각도계측항목에 비해 전반적으로 큰 양상을 나타냈다. 2. 고경계측항목 중 회전축으로부터 먼 계측점간의 거리를 나타내는 항목일수록 투사오차가 컸다. 3. 폭경 계측항목 중 비강폭경, 상악폭경, 상악 제1대구치간 폭경은 각 회전각도 간에 통계적 유의차가 없었으나 하악폭 경과 하악 제1대구치간 폭경은 통지적으로 유의차가 있었다. 4. 각도계측항목 중 menton의 편위정도를 나타내는 각도는 각 회전각도 간에 통계적 유의차가 없었으나 crista galli와 maxillare를 연결한 선이나 crista galli와 antegonion을 연결한 선과 수평기준선이 이루는 각도는 통계적으로 유의차가 있었다. 이상의 결과는 수직적 두부회전에 의해 정모두부방사선사진상에 투사오차가 발생하므로 유용한 정모두부방사선사진을 얻기 위해서는 촬영시마다 동일한 두부위치를 유지하기 위한 노력이 필요함을 시사하였다.

• Journal of Periodontal and Implant Science
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• 제35권3호
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• pp.761-776
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• 2005

The purpose of the present study was to examine the relationship between the form of the clinical crowns in the maxillary anterior segment and the clinical feature of gingiva such as morphological characteristics and the gingival thickness. Fifty periodontally healthy subjects were clinically examined regarding the probing depth, the thickness of the free gingiva, and the width of the keratinized gingiva. From study models of the maxillary anterior region, the width at cervical third(CW) and the length(CL) of the clinical crown, the papillary height, and the gingival angle of the 6 anterior teeth were measured. Each tooth was classified into 4 groups (longnarrow, NL; narrow, N; wide, W; short-wide, WS) according to CW/CL ratio and all the data were compared between groups NL and WS using independent t-test. Stepwise multiple regression analysis was performed for each tooth region with the gingival thickness at the level of sulcus bottom, the width of keratinized gingiva, and gingival angle as the dependent variables. As the results, the NL group of the upper anterior teeth displayed, higher papilla height, and narrower keratinized gingiva, more acute gingival angle resulting in pronounced "scalloped" contour of the gingival margin, compared to the WS group. There was no significant difference between groups NL and WS with respect to probing depth and the gingival thickness. The regression analyses demonstrated that the gingival thickness in central incisors was significantly associated to the mesio-distal width and bucco-lingual width of the crown, and labial probing depth. The width of keratinized gingiva was significantly associated with labial probing depth in central incisors and with proximal probing depth and gingival angle in lateral incisors, and with labial and proximal probing depth, and gingival angle in canines. The gingival angle was significantly associated with papillary height and CW/CL ratio and additionally with proximal probing depth in central incisors, with the width of keratinized gingiva in lateral incisors, and with labial probing depth and the width of keratinized gingiva in canines. These results indicate that the form of clinical crown in upper anterior region could influence the clinical feature of gingiva and the influencing factors might be different according to the tooth region.

• 한국환경복원기술학회지
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• 제12권2호
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• pp.73-82
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• 2009

The traffic volume of Seoul is extremely high in comparison to other major cities in Korea, and the result has been harmful physical and mental exposure to pollution by Seoulites on a regular basis. The street air pollution is more important than the others, because the air pollution generated by street traffic directly impacts the health of nearby pedestrians. This problem requires urgent attention and resolution. Among the factors creating the air pollution originating from the street, is the configuration of streets, which have emerged as the most significant because it is related to air and pollutant dispersion. Therefore, this study was conducted under the assumption that street form affects the air quality. Study sites were classified by street characteristics, and air quality was analyzed in each class. Then the OSPM (Operational Street Pollution Model) was employed to simulate the relationship between street configuration and air quality of streets within the old city center and new city center in Seoul. After that this study analyzed the correlation between air pollution and the spatial configuration of urban streets (ex. street width, building height, building density, etc.) to determine their contributions to air pollution. The outcome of this study is as follows : First, the result that was derived from the correlation analysis between street configuration and air quality hewed that the air pollution of the street is influenced by the average height of building, width of the roads as well as traffic volume. On the roadside, the concentration level of $NO_2$ is mainly affected by the average height of building and the deviation of building height along the street and CO is affected by street width. The outcome of this study can be used as a basis for more sound urban design policies, and the promotion of desirable street environments for pedestrians.

• 한국해안·해양공학회논문집
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• 제31권2호
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• pp.73-87
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• 2019

파랑의 작용에 의해 유사가 이동되어 연안의 침식 퇴적이 일어나지만 상당히 비선형적이고 비정상적인 과정이므로, 파랑과 침식 퇴적의 상관성을 밝히고 예측하기는 쉽지 않다. 본 연구는 동해안에서 비디오 모니터링으로 얻은 5개 지점의 해빈폭 자료와 인근의 3개 지점의 파랑 모니터링 자료를 연계하여 상관성을 분석하였다. 전체 자료에 대한 상관분석에서는 유의미한 상관성이 없었지만, 기간 및 파랑 조건에 따른 상관분석에서는 주목할 만한 결과들이 제시되었다. 파고의 비초과확률이 약 99% 이상인 경우에는 주기와 해빈폭 변화 사이에 강한 음의 상관성이 있었으며, 주기의 비초과확률이 약 99% 이상인 경우에는 파고와 해빈폭 변화 사이에 강한 음의 상관성이 있었다. 주파향이 해안선 직각 방향과 인접한 경우, 주파향으로 입사하는 파랑에 대해 해빈폭이 확연히 감소하였다. 해빈폭과 파랑 사이에 뚜렷한 계절적 상관성이 나타나지는 않았으나, 태풍과 같은 특정 사건의 영향을 크게 받는 것으로 나타났다. 이러한 연구 결과의 실제 현장 적용을 위해서는 이와 같은 조건에 따른 상관 분석을 상세히 하여 해빈폭 변화 경향의 기준이 되는 파랑에 대해 더욱 정확한 정보를 얻을 필요가 있다.