• Journal of Chest Surgery
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• 제31권12호
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• pp.1234-1237
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• 1998

Marfan 증후군과 같은 대동맥 질환의 경우 대동맥동 및 대동맥륜의 점진적인 확장 및 변형이 발생하여 대동맥판막의 폐쇄부전을 초래한다. 이런 경우 대부분 상행대동맥과 대동맥 판막을 composite graft의 형태로 치환하고 여기에 관상동맥을 문합하는 술식이 적용되어왔다. 본 증례는 Marfan 증후군이 동반된 22세 남자 환자로 대동맥 근부 확장과 승모판막 부전이 있었다. 수술은 대동맥 판막 및 좌심실유출로의 일부를 보존하면서 상행대동맥 및 Valsalva동의 동맥류를 제거하고, 대동맥 판막 및 관상동맥을 인조혈관에 다시 문합하는 술식을 적용하였다. 술후 심초음파 검사상 대동맥 판막의 기능은 정상이었다. 대동맥륜 확장증에 있어서 대동맥 판막이 정상적인 해부학적 구조를 가진다면 이상의 술식을 적용함으로써 자신의 대동맥 판막은 보존하면서 대동맥 근부를 치환할 수 있으리라 생각된다.

• Journal of Periodontal and Implant Science
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• 제43권6호
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• pp.283-290
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• 2013

Purpose: The concept of gingival biotype has been used as a predictor of periodontal therapy outcomes since the 1980s. In the present study, prospective and controlled experiments were performed to compare periodontal pocket depth (PPD) reduction and gingival shrinkage (GSH) after scaling and root planing (SRP) according to gingival biotype. Methods: Twenty-five patients diagnosed with chronic periodontitis participated in the present study. The PPD and GSH of the labial side of the maxillary anterior teeth (from the right canine to the left canine) were evaluated at baseline and 3 months after SRP. Changes in the PPD following SRP were classified into 4 groups according to the gingival thickness and initial PPD. Two more groups representing normal gingival crevices were added in evaluation of the GSH. The results were statistically analyzed using the independent t-test. Results: In the end, 16 patients participated in the present study. With regard to PPD reduction, there were no significant differences according to gingival biotype (P>0.05). Likewise, sites with a PPD of over 3 mm failed to show any significant differences in the GSH (P>0.05). However, among the sites with a PPD of under 3 mm, those with the thin gingival biotype showed more GSH (P<0.05). Conclusions: PPD changes after SRP were not affected by gingival biotype with either shallow or deep periodontal pockets. GSH also showed equal outcomes in all the groups without normal gingival crevices. The results of SRP seem not to differ according to gingival biotype.

• 대한치과교정학회지
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• 제45권4호
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• pp.180-189
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• 2015

Objective: To compare the positions of the mandibular premolars in Angle Class I subjects according to vertical facial type. The results will provide a theoretical basis for predicting effective tooth movement in orthodontic treatment. Methods: Cephalometric parameters were determined using cone-beam computed tomography in 120 Angle Class I subjects. Subjects were categorized as short, normal, and long face types according to the Frankfort mandibular angle. Parameters indicating the position of the mandibular right premolars and the mandible were also measured. Results: The angle between the mandibular first premolar axis and buccal cortex, the distance between the root apex and buccal cortex, angle of vestibularization, arc of vestibularization, and root apex maximum movable distance were significantly greater in the short face type than in the long and norm face types. The angle between the mandibular second premolar axis and buccal cortex, the distance from root apex to buccal cortex, and the arc of vestibularization were significantly greater in the short face type than in the normal face type. Conclusions: There are significant differences in the mandibular premolar positions in Class I subjects according to vertical facial type.

• Structural Engineering and Mechanics
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• 제45권5호
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• pp.595-611
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• 2013

This paper aims to compare three collocation point methods associated with the odd order stochastic response surface method (SRSM) in a systematical and quantitative way. The SRSM with the Hermite polynomial chaos is briefly introduced first. Then, three collocation point methods, namely the point method, the root method and the without origin method underlying the odd order SRSMs are highlighted. Three examples are presented to demonstrate the accuracy and efficiency of the three methods. The results indicate that the condition that the Hermite polynomial information matrix evaluated at the collocation points has a full rank should be satisfied to yield reliability results with a sufficient accuracy. The point method and the without origin method are much more efficient than the root method, especially for the reliability problems involving a large number of random variables or requiring complex finite element analysis. The without origin method can also produce sufficiently accurate reliability results in comparison with the point and root methods. Therefore, the origin often used as a collocation point is not absolutely necessary. The odd order SRSMs with the point method and the without origin method are recommended for the reliability analysis due to their computational accuracy and efficiency. The order of SRSM has a significant influence on the results associated with the three collocation point methods. For normal random variables, the SRSM with an order equaling or exceeding the order of a performance function can produce reliability results with a sufficient accuracy. The order of SRSM should significantly exceed the order of the performance function involving strongly non-normal random variables.

• 한국건축시공학회지
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• 제18권5호
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• pp.463-469
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• 2018

기존의 다층으로 구성되어 시공성이 낮은 옥상녹화 공법의 개선을 위해 개발한 방수 방근 시트 일체화 옥상녹화박스 유닛공법의 일체화를 위해 사용하는 전자기 유도가열방식의 금속 고정구와 콘 형상 고정구의 부착성능을 평가하기 위해 엔지니어링 PE, TPO, PVC 시트 등 3종류의 시트에 가열온도에 따른 부착성능 및 동일한 시험체로 냉열반복 후 부착성능을 측정하였다, 그 결과는 엔지니어링 PE시트에 부착한 고정구의 부착성능이 가장 우수하게 나타났으며, 금속고정구는 가열온도가 올라갈수록, 콘 형상 고정구는 가열온도가 낮을수록 우수한 부착성능을 보여주었고, 냉열 반복 후 부착시험 결과는 상온 부착시험 결과와 동일하게 나타났다. 기존의 양면 부틸테이프 고정방식의 콘 형상 고정구는 낮은 부착하중과 냉열반복에 의한 뚜렷한 성능저하가 발생하는데 비하여 전자기 유도가열방식의 고정구는 우수한 성능을 유지하였다.

• 한국식물병리학회지
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• 제11권1호
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• pp.94-97
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• 1995

In 1994, an abnormal rice growth was observed in a 0.5-ha scale farmer's field located at Chogye-Myeon, Hapcheon-Gun, Gyeongnam Province where rice cv. Hwayeongbyeo was seeded directly in dry paddy field conditions. The major symptoms were less stands per acreage, short leaf length, and hypertrophy of root tip portion. The disorder was identified as rice seeding bight caused by Rhizopus sp. The average plant stand per m2 in the infested field was 108, while it was 375 in the normal field, and leaf growth was retarded to less than one-third of healthy plant. The average leaf lengths of infected and healthy seedlings were 12.8cm and 38.9cm, respectively. When the infected seedlings were transplanted to pots, flooded-soil conditions developed no new root growth but upland conditions allowed 11.2 new roots emerging. The length of newly emerged root in infested soil was 5.3cm in upland and 7.1cm in intermediate flooding conditions. However, it was 10.9cm in non-infested soil with intermediate flooding conditions. When the plants were matured, the stem length of infected plants was reduced slightly as compared to normal plants, whereas the length of panicle was not significantly different between infected and healthy plants. The number of panicle per plant, however, greatly different with variation of infection degree. Grain quality such as the number of complete and incomplete grains per panicle, the complete grain weight per panicle, and the weight of 1000 grains was not significantly different.

• 고려인삼학회:학술대회논문집
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• 고려인삼학회 1978년도 학술대회지
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• pp.43-49
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• 1978

This study was devised to observe the cytotoxic activity of extracts of Panax ginseng root against some cancer cells and to purify the crude extract. Three kinds of cancer cells(leukemic cells L5178Y, HeLa cells and Sarcoma 180 cells) and mouse embryo cells (as normal cells) were used for this study. The ginseng roots were extracted with petroleum ether in soxhlet apparatus, and the crude extracts were purified by the silicic acid column chromatography and thin-layer chromatography methods. The results obtained are summarized as follows; 1. Eight to ten mg of the petroleum ether extract (crude extract) were obtained from 1 g of Panax ginseng root, and its activities per mg were about 1,000 units. 2. Doubling time of the L5178Y cells was increased to two fold by 24 hours incubation in culture medium containing about one ${\mu}g$ of extract per ml, and eight and ten folds higher concentration of ginseng extract were required for the Sarcoma 180 cells and HeLa cells, respectively, than for the leukemic cells(L5178Y) to inhibit the cellular growth to the same degree. 3. When the L5178Y cells were exposed to medium containing various concentration of the extract for 24 hours before initiation of the soft agar cloning procedure, about $99\%$ of the L5178Y cells were killed at concentration of 8 units per ml. 4. The growth rate of mouse embryo cell (as normal cell) was not affected by the culture with media containing various amounts (1.45 to 30.0 ${\mu}g/ml$) of the extract. 5. The crude extract could be purified about four times by silicic acid column chromatography using several solvent systems, and one spot of active compound could be obtained on the thin-layer chromatogram. 6. In the Swiss mice inoculated with Sarcoma 180 cells, a survival time of the experimental group (injection group of active compound) was extended more. 1.5 to 2.0 times than the control group's(no injection group).

• 한국산림과학회지
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• 제102권4호
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• pp.477-483
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• 2013

본 연구의 목적은 몬테 카를로 시뮬레이션을 이용하여 소나무 탄소배출계수 자료의 확률밀도를 추정하고 불확도를 제시하는데 있다. 이용된 탄소배출계수는 목재기본밀도, 바이오매스확장계수, 뿌리함량비이고 4개의 확률밀도 함수(정규분포, 로그정규분포, 감마분포, 와이불 분포)를 고려하였다. 2-표본 콜모그로프-스미르노프 검정통계량과 누적밀도그림을 비교하여 최적의 확률밀도함수를 선정하고 상한과 하한의 불확도를 제시하였다. 본 연구의 결과에 의하면, 각 탄소배출계수에서 추정된 확률밀도함수는 강원지방소나무에서 목재기본밀도는 감마분포, 바이오매스확장계수는 로그정규분포, 뿌리함량비는 정규분포이고 중부지방소나무에서 목재기본밀도는 정규분포, 바이오매스확장계수는 감마분포, 뿌리함량비는 감마분포를 나타내었다. 강원지방소나무 탄소배출계수의 불확도는 상한에서 62.1%, 하한에서 -52.6%이고 중부지방소나무는 상한에서 43.9%, 하한에서 -34.5%를 나타내었다.

• 대한한방내과학회지
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• 제1권1호
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• pp.35-43
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• 1976

The effects of root of the Bupleurum falcatum L. on the serum transaminase (SGP-T, SGO-T) activities and the content of total cholesterol in serum from normal and alloxan-diabetic rabbits were observed. The preparations were extracted by methanol, and extracted samples were orally administrated to the normal and alloxandiabetic rabbits. The transaminase activities and the content of total cholesterol in serum of normal rabbits were significantly increased by administration of the alloxan. The increased serum transaminase activities of the alloxandiabetic rabbits were significantly decreased after 96 hours by administration of the extracted samples. The increased content of total cholesterol in serum of the alloxan-diabetic rabbits were gradually decreased by administration of the extracted samples and were recovered to the control levels after 12 days. According to the above results, it would be concluded that the extract of Bupleuri Radix influences for the recovery of the increased contents of total cholesterol and serum transaminase activities by alloxan.

• 한국공작기계학회논문집
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• 제15권3호
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• pp.17-23
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• 2006

The strength estimation is carried out for injection molded plastic stepped gear. The stepped gear is considered as a plate model which is fixed by two edges and freed on the other sides. The stress of common normal gear is calculated by Lewis formula which can be derived quite simply from the equation fur the stress at the root of a cantilever beam. Stress ratio(step factor) between the common normal gear and stepped gear is proposed for the ratio of the bending stress of normal gear and that of stepped gear. This study proposes the step factor added in Dupont equation which is used for strength estimation of injection molded plastic stepped gear.