• Journal of Ginseng Research
• /
• v.21 no.3
• /
• pp.201-208
• /
• 1997

In order to compare the physical property of the rhizome of the Korean ginseng with the Chinese ginseng, the break intensity of the ginseng rhizome was measured using a rheometer (FVDOH RHEO METER, Rheotech Co.). The intensities for the Korean red ginseng were 10.0$\pm$ 2.1 kg/cm2(n=72), while the intensities for the Chinese red ginseng were 4.0$\pm$2.4 kg/cm2(n=142) which were significantly lower than those for the Korean red ginseng at 1% level. The intensities for the Korean white ginseng were 9.9$\pm$2.0 kg/cm2 (n=97), while the intensities for the Chinese deied ginseng were 4.5$\pm$2.7 kg/cm2(n=138) which were significantly lower than those for the Korean white ginseng at 1% level. These results suggest that the rhizome of the Chinese ginseng might be much more easily broken than the rhizome of the Korean ginseng. Conclusively the break intensity of the ginseng rhizome is thought to be useful for differentiating the Chinese ginseng with the Korean ginseng.

• Journal of Yeungnam Medical Science
• /
• v.33 no.1
• /
• pp.52-55
• /
• 2016

Guide wire fracture during percutaneous coronary intervention (PCI) is rare. It can cause fatal complications such as thrombus formation, embolization, and perforation. Guide wire fracture could occur during intervention for severely calcified stenotic lesions, and rarely from distal small branches of stenotic lesions. There are several methods for its management depending on the material character, position, length of the remnant, and the patient's condition. If percutaneous retrieval was not achieved, the surgical procedure should be considered for prevention of potential risks, although the remnant guide wire does not usually cause complications. We experienced a patient with a guide wire fracture during PCI, and managed to prevent its complications through surgical removal of the remnant wire. We report this case here.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
• /
• 2000.11a
• /
• pp.42-42
• /
• 2000

패선/구부림 가공은 백판지의 후가공의 일부분으로서 통상적으로 고평량인 백판지를 소비 자에게 맞는 형태로 가공하는 한 공정으로서 접는 공정을 용이하게 하기 위하여 종이 표면 에 패선을 넣어 구부려 접게 되는데 이때 구부리는 면의 표면적의 증가와 내부에서 외부로 향하는 Stress 에 의하여 종이의 표면층이 터지는 현상이 발생하기도 한다.이러한 터짐을 방지하면서 구부립 가공을 하기 위하여 백판지에 요구되는 특성은 여러 가지가 있으며 특히 고평량인 경우에는 종이가 구부러지면서 변형이 크게되는 만큼 외부로 밀리는 힘이 더욱크 게 작용하게 되고 이 힘을 충분히 수용할 수 있는 종이 자체의 강도가 펼요하게 되는데 본 연구에서는 다층판지의 원료특성과 판지특성등이 패션/구부림 가공적성과 연관성을 밝혀내 어 향후 연구방향의 기초를 삼고자 한다. 본 실험에서는 실험실적 결과와 실제 제품에서와의 차이를 최소화 하기 위하여 현장에서 생산되는 백판지를 사용하였으며 백판지의 각층을 구성하는 원료특성과의 상관관계까지 고 려하여 대전공장에서 생산되는 원료의 특성을 분석하고 같은 시간대의 제품과 비교펑가하는 방법을 취하였다. 각각의 원료 특성과 제품특성 (구부러짐 특성) . 공정조건등의 자료를 일정기간 취합하여 S Statisca 를 사용한 통계분석을 하였으며 1차 분석 결과 종이무성에 미치는 영향이 큰 수분 함량과 표면층의 원료구성 (Softwood 함량) 이 일차적으로 영향을 크게 미치며 종이 특성 으로는 CD 방향 터짐과 관련하여 MD 방향 인장, 내절, CD방향 강성등이 상관관계지수 0 0.7 이상으로 비교적 관계가 깊은 것으로 나타나며 인장과 신장율의 곱인 Toughness는 상 대적으로 낮아 터짐 지수로 활용하기는 어려울 것으로 판단되며 또한 신장율도 0.5 수준으 로 나타나며 패선구부러짐에 따른 층간구조변화에 따른 층간결합력이 영향이 있을 것으로 추측은 되었으나 분석결과 0.5 수준인 것으로 나타났다. 또한 CD 방향과 MD 방향의 터짐 성 상관관계도 0.5 이상인 것으로 나타나 섬유배향성도 패선/구부림 가공적성과 관련이 있 는 것으로 나타남으로서 패선/구부림 적성향상은 원료뿐만 아니라 초지공정조건에서도 향상 될 수 있는 것으로 나타났다. 향후 보다 세분화한 분석 및 도공층의 역할이 펼요할 것으로 판단되며 또한 지층구조분석 을 통한 Modeling 도 필요한 것으로 판단된다.

• The Journal of Engineering Geology
• /
• v.8 no.1
• /
• pp.13-23
• /
• 1998

An intensity of the 1997 Kyungju earthquake(M=4.3) was estimated at three hundred locations based on the field survey and questionaires from 2200 residents. The isoseismal shows almost circular pattern which doesnot reflect some specific geological trends. However,most of the Kyeongsang basin except the southwestern part is included within the area of MM intensity V. There occurred strong shaking, numerous cracks on the wall of the houses, and movement of slate on the roofs, falling of the tiles from the monument. The isoseismal of the highest MM intensity VII, 1-3 km in width and 9 km in length, is elongated along the Yangsan fault, which is located about 1.5 km west from epicenter. The lineaments near the epicenter exhibit almost N-S and NNE directions. The lineament distribution, the pattern of damage area and the solution of fault plane suggest that the Kyongju earthquake occurred with strike-slip sense along the Yangsan fault. The calculated intensity attenuation(I) with distance(R) is as follows : $I{\;}={\;}I_o{\;}+{\;}0.3461{\;}-{\;}0.3274{\;}{\times}{\;}1nR{\;}-{\;}0.086{\;}{\times}{\;}R$.

• Journal of the Korean Institute of Traditional Landscape Architecture
• /
• v.42 no.3
• /
• pp.42-50
• /
• 2024

This study aims to develop a method for assessing the structural stability of large-old trees, which are typically evaluated primarily for their physiological health. To achieve this, finite element analysis(FEA) was applied to Zelkova serrata (Thunb.) Makino, which are significant as natural monuments, protected trees and street trees in urban areas and parks. Four representative large-old trees in Buyeo-gun, which had undergone surgical treatment, were selected for creating analytical models and being conducted FEA. The key findings are as follows: first, we made 3D models by acquiring 3D scanning and ultra sonic tomography data for analyzing FEA. We proposed methods for constructing 3D meshes and calculating self-weight and wind loads based on tree shape to interpret FEA. Second, the study confirmed that wind loads increase proportionally with the size of the tree and the shape of the canopy. Wind loads were observed irregularly in cases of unusual shapes or multiple segments of the canopy. Third, FEA's result of large-old trees with decay-induced cavities indicated that even under strong winds (70m/s) from typhoons, the likelihood of damage from trunk breakage due to self-weight was relatively low. Fourth, decay-induced cavities were found to affect internal stress distribution, leading to structural weaknesses. This highlights the need for measuring and documenting the shape of cavities during tree assessments. Accurate measurement and documentation of branching and tree form are also crucial, as complex branching and cavities increase the likelihood of structural weaknesses. The study also identified limitations in estimating self-weight, transmissivity, and projected areas of the canopy based on wind direction. To improve the accuracy of FEA, the method for enhancing precision of the 3D model and measuring the canopy and is necessary.

• Restorative Dentistry and Endodontics
• /
• v.36 no.3
• /
• pp.211-218
• /
• 2011

Purpose: Intentional replantation (IR) is a suitable treatment option when nonsurgical retreatment and periradicular surgery are unfeasible. For successful IR, fracture-free safe extraction is crucial step. Recently, a new extraction method of atraumatic safe extraction (ASE) for IR has been introduced. Patients and Methods: Ninety-six patients with the following conditions who underwent IR at the Department of Conservative Dentistry, Seoul National University Bundang Hospital, in 2010 were enrolled in this study: failed nonsurgical retreatment and periradicular surgery not recommended because of anatomical limitations or when rejected by the patient. Preoperative orthodontic extrusive force was applied for 2-3 weeks to increase mobility and periodontal ligament volume. A Physics Forceps was used for extraction and the success rate of ASE was assessed. Results: Ninety-six premolars and molars were treated by IR. The complete success rate (no crown and root fracture) was 93% (n = 89); the limited success rates because of partial root tip fracture and partial osteotomy were 2% (n = 2) and 5% (n = 5), respectively. The clinical and overall success rates of ASE were 95% and 100%, respectively; no failure was observed. Conclusions: ASE can be regarded as a reproducible, predictable method of extraction for IR.

• Weed & Turfgrass Science
• /
• v.5 no.4
• /
• pp.230-235
• /
• 2016

Miscanthus are perennial rhizomatous grasses and considered as an ideal cellulosic bioenergy crop. Recently, it was reported that Miscanthus was damaged by the larvae of rice stem borer, Chilo suppressalis Walker, one of the most destructive pests of rice in Korea since the 1960s. This study was thus conducted to evaluate the insecticidal effects against rice stem borer in the Miscanthus cultivation fields for two years. The experiment consisted of four chemical agent plots, one environment-friendly agent plot, and untreated plot. Untreated plot showed significantly high damage of 50%, while Buprofezin Tebufenozide and Carbosulfan Methoxyfenozide treatment plots showed low damage rate of 2% with low larvae density of 1 and $2.3larvae\;m^{-2}$, respectively. Damage rates of Tebufenozide, ChlorantraniliproleIndoxacarb, and environment-friendly agent(MatrineWood vinegar solution) were 15, 26, and 18%, respectively, which were lower than that of untreated plot but higher than those of Buprofezin Tebufenozide and Carbosulfan Methoxyfenozide. In conclusion, rice insecticides were effective against rice stem borer in Miscanthus field. In particular, the treatments with Buprofezin Tebufenozide and Carbosulfan Methoxyfenozide showed excellent control effects with control value of 93.3 and 95.2. However, further studies with different types of insecticides should be carried out for the selection of insecticides with more effective control of rice stem borer.

• Journal of Animal Environmental Science
• /
• v.11 no.3
• /
• pp.153-160
• /
• 2005

This study was conducted to determine the effect of floor type of finishing building and increasing market weight of finishing Pigs on Performance, carcass traits and pork quality. Four hundred and forty-four finishing pigs were confined and administered with different floor type(concrete slat and bedded with sawdust) and increasing market weight(110kg to 130kg) of finishing building. The result obtained from this study were summarized as follows; 1. There was no significant difference between the floor type of finishing building in the body weight gain, feed intake and gain per feed. And also increasing market weight of finishing pigs was not affected the performance of finishing pigs. 2. Increasing market weight of finishing pigs affect the carcass yield. The market weight at 130kg showed more amount of each cut of carcass, especially the belly portion was higher, but backfat thickness was not different. 3. Carcass traits did not show any significant difference due to the difference of market weight of finishing pig and floor type of finishing building. 4. There was no significant difference in the chemical compositions and meat color of pork loin between the floor type of finishing building and increasing market weight of finishing pigs.

• Journal of Soil and Groundwater Environment
• /
• v.10 no.6
• /
• pp.20-31
• /
• 2005

Three dimensional Monte-Carlo simulations of non-ergodic transport of a lion-reactive solute plume by steady-state groundwater flow under a uniform mean velocity in isotropic heterogeneous aquifers were conducted. The log-normally distributed hydraulic conductivity, K(x), is modeled as a random field. Significant efforts are made to reduce tile simulation uncertainties. Ensemble averages of the second spatial moments of the plume and plume centroid variances were simulated with 1600 Monte Carlo runs for three variances of log K, ${\sigma}_Y^2=0.09,\;0.23$, and 0.46, and three dimensionless lengths of line plume sources normal to the mean velocity. The simulated second spatial moment and the plume centroid variance in longitudinal direction fit well to the first order theoretical results while the simulated transverse moments are generally larger than the first order results. The first order theoretical results significantly underestimated the simulated dimensionless transverse moments for the aquifers of large ${\sigma}_Y^2$ and large dimensionless time. The ergodic condition for the second spatial moments is far from reaching in all cases simulated, and transport In transverse directions may reach ergodic condition much slower than that in longitudinal direction. The evolution of the contaminant transported in a heterogeneous aquifer is not affected by the shape of the initial plume but affected mainly by the degree of the heterogeneity and the size of the initial plume.

• Journal of dental hygiene science
• /
• v.16 no.3
• /
• pp.193-199
• /
• 2016

The objective of this study was to investigate the relationship between health-risk factors and oral health in Korean adolescents. This cross-sectional study was based on the 9th Korea Youth Risk Behavior Web-Based Survey (2013). The final participation rate in the survey was 96.4%. of a Total of 72,435 adolescents (age, 12~18 years) who had participated in the survey, 66,951 adolescents (33,777 boys and 33,174 girls) were selected for analysis, after excluding those with missing data. The key variables were oral health factors (one or more of the six oral symptoms), general characteristics (five factors), and health-risk factors (five factors). After adjusting for the general characteristics, frequency analysis, ${\chi}^2-test$ using PASW Statistics ver. 18.0, and logistic regression analysis were performed to understand the effects of health risk-factors on the oral symptoms experienced by the study subjects. Subjects who answered 'Yes' for alcohol consumption had a 1.33 times higher risk of experiencing oral symptoms. Further, subjects who smoked were at a 1.2 times higher risk of experiencing oral symptoms. With regard to internet use, the risk of experiencing oral symptoms was 1.25 times higher for subjects who used the internet for 7 hours or more than for those who used it for less than 1 hour. Compared to those subjects who had not experienced violence in school, the odds ratio of subjects who had experienced it 3~4 times was 1.54-fold higher. The study found that health-risk factors were associated with oral symptom experience. Therefore, programs to understand health-risk factors and interventions should be developed for Korean adolescents and provided on a regular basis along with oral health education.