• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 추계학술대회 논문집
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• pp.445-452
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• 1998

The dynamic performance design of catenary-pantograph system which collects current for the next generation Korean high speed train(KHST) was considered. Used was the same dynamic model of the catenary-pantograph system as that of TGV-K which will be introduced for Kyung-bu corridor. Using the model , sensitivity analysis fer design variables were made to improve dynamic performance of KHST system. The results of sensitivity analysis and performance improvement are as follows: (1) It was found that aerodynamic force, tension of contact wire, mass of contact strip, mass of supporting contact strip, mass of clamp, mass of steady arm, and stiffness of plunger were the design variables most influencing the dynamic performance of the system. (2) Pantograph with reductions of 20% aerodynamic force, 34% weight of supporting contact strip, 20% spring constant of plunger, and 34% equivalent mass of steady arm was very possible system for the KHST which will be running at maximum operating speed 350 km/h.

• Child Health Nursing Research
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• 제28권3호
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• pp.176-186
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• 2022

Purpose: This study investigated the nutritional status of ethnic (belonging to minority groups) preschool children in Northern Thailand. Methods: In this cross-sectional descriptive study, the sample group included 147 parents and 147 preschool children (2-6 years old). Participants volunteered to complete a questionnaire on the personal information of children and parents, as well as family- and school-related factors. Data were analyzed using descriptive statistics, a nutritional status calculator, and logistic regression analysis. Results: A birth weight of less than 2,500 g was related to weight-for-age and weight-for-height. Not having been breastfed and having been breastfed for less than 6 months were related to weight-for-height. An elementary school education level among parents was related to children's height-for-age. Familial unhealthy food consumption for 1-2 days per week was related to weight-for-age and height-for-age. Conclusion: This study reflects the importance of nutritional care for children at the beginning of pregnancy and continuing to the preschool age, as well as the importance of breastfeeding. Families were found to be a key factor in supporting good nutrition among children.

• Advances in pediatric surgery
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• 제15권1호
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• pp.18-26
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• 2009

The survival of Very Low Birth Weight (VLBW) infants has been improved with the advancement of neonatal intensive care. However, the incidence of accompanying gastrointestinal complications such as necrotizing enterocolitis has also been increasing. In intestinal perforation of the newborn, enterostomy with or without intestinal resection is a common practice, but there is no clear indication when to close the enterostomy. To determine the proper timing of enterostomy closure, the medical records of 12 VLBW infants who underwent enterostomy due to intestinal perforation between Jan. 2004 and Jul. 2007 were reviewed retrospectively. Enterostomy was closed when patients were weaned from ventilator, incubator-out and gaining adequate body weight. Pre-operative distal loop contrast radiographs were obtained to confirm the distal passage and complete removal of the contrast media within 24-hours. Until patients reached oral intake, all patients received central-alimentation. The mean gestational age of patients was $26^{+2}$ wks ($24^{+1}{\sim}33^{+0}$ wks) and the mean birth weight was 827 g (490~1450 g). The mean age and the mean body weight at the time of enterostomy formation were 15days (6~38 days) and 888 g (590~1870 g). The mean body weight gain was 18 g/day (14~25 g/day) with enterostomy. Enterostomy closure was performed on the average of 90days (30~123 days) after enterostomy formation. The mean age and the mean body weight were 105 days (43~136 days) and 2487 g (2290~2970 g) at the time of enterostomy closure. The mean body weight gain was 22 g/day after enterostomy closure. Major complications were not observed. In conclusion, the growth in VLBW infants having enterostomy was possible while supporting nutrition with central-alimentation and the enterostomy can be closed safely when the patient's body weights is more than 2.3 kg.

• Physical Therapy Rehabilitation Science
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• 제3권1호
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• pp.49-54
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• 2014

Objective: This study aimed to identify how various applications of weight bearing on the affected side of hemiplegia patients affect the ability of balance keeping of the affected leg and the gait parameters. Design: Cross-sectional study. Methods: Eighteen patients with hemiplegia participated in this study. There were twelve males and six females. This study investigated the effects of the single-leg stance exercise on dynamic balance, weight bearing, and gait ability compared with four conditions. Dynamic balance and weight bearing were measured using the step test (ST) of the affected side in stroke patients. In addition, gait parameters were measured using the optogait system for analysis of the spatial and temporal parameters of walking in stroke patients. Results: This study investigated the effect of the single leg stance exercise on the paralysis side. The ST showed significant findings for all conditions (p<0.05). Therefore, knee extension and flexion exercise on the affected side single-leg stance (condition 4) significantly improved dynamic balance and weight bearing on the affected side (p<0.05). In the condition of moving the knee joint in a single-leg stance was discovered that the stance phase time significantly increased more than in the condition of supporting the maximal voluntary weight on the affected side (p<0.05). Conclusions: Single-leg stance on the paralysis side with knee flexion and extension increased symmetry in weight bearing during stance phase time. This study suggests that single-leg stance exercises augments improved gait function through sufficient weight bearing in the stance phase of the affected side.

• 농촌계획
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• 제20권3호
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• pp.121-130
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• 2014

This study aimed at setting up the evaluation indicators system by rural village types to identify systematically the multi-valuedness embedded in rural villages. AHP(Analytic Hierarchy Process) was used for evaluating the relative importance weight evaluation of each indicator and quantitative analysis of rural village through computer works. The importance weight of evaluation indicators was converted into the score on the basis of maximum 1,000 point to increase the practicality. As a result, characteristics of 5 rural village types(Basic life-supporting, Agricultural promotion, Marketing/processing oriented, Urban-rural communication, Life-style choice types) differed in score of classified indicators. Also, These results are expected to be possible to quantitatively evaluate characteristics by rural village types.

• 한국환경농학회지
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• 제29권4호
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• pp.408-416
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• 2010

To evaluate the effectiveness of AMF on the growth of horticultural crops, we compared mycorrhizal and non-mycorrhizal plants, perilla (P. frutescens Britt.), that were inoculated with AMF propagules. In the early stages of growth of perilla, compared to the AMF- perilla seedlings, in AMF+ perilla seedlings at 3 weeks after sowing, leaf length and width increased 17% and 29%, leaf area increased 28%, and shoot fresh weight increased 33%, root total length increased 1%, and chlorophyll content increased 3%. Further at 10 weeks after sowing, compared to the AMF- perilla plants, in perilla plants inoculated with AMF at the sowing and transplanting stages, leaf area increased 21% and 19%, shoot length increased 19% and 17%, root fresh weight increased 17% and 20%, and chlorophyll content increased 5.1% and 4.8%, respectively. Moreover, at 14 weeks after sowing, compared to the AMFperilla plants, in perilla plants inoculated with AMF at the sowing and transplanting stages, the number of leaves increased 16% and 20%, root fresh weight increased 16% and 17% significantly. Further, leaf fresh weight increased 9% and 11%, shoot diameter increased 4.5% and 7.3%, and chlorophyll content increased 1.5% and 2.5%, respectively. The levels of many macronutrients and micronutrients were tended to be significantly higher in AMF+ plants than in AMF- plants, supporting the association between AMF and enhanced growth of plants grown from AMF+ seedlings.

• Journal of Information Processing Systems
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• 제15권6호
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• pp.1365-1377
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• 2019

Summarizing the differences in Chinese-Vietnamese bilingual news plays an important supporting role in the comparative analysis of news views between China and Vietnam. Aiming at cross-language problems in the analysis of the differences between Chinese and Vietnamese bilingual news, we propose a new method of summarizing the differences based on an undirected graph model. The method extracts elements to represent the sentences, and builds a bridge between different languages based on Wikipedia's multilingual concept description page. Firstly, we calculate the similarity between Chinese and Vietnamese news sentences, and filter the bilingual sentences accordingly. Then we use the filtered sentences as nodes and the similarity grade as the weight of the edge to construct an undirected graph model. Finally, combining the random walk algorithm, the weight of the node is calculated according to the weight of the edge, and sentences with highest weight can be extracted as the difference summary. The experiment results show that our proposed approach achieved the highest score of 0.1837 on the annotated test set, which outperforms the state-of-the-art summarization models.

• 천문학회보
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• 제40권1호
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• pp.81.3-81.3
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• 2015

Carbon Fiber Re-enforced Polymer (CFRP) has replaced steel, especially for mobile devices. As CFRP is stiff and light-weight, it has been applied to airplane, sport car, golf clubs, semiconductor transporter, satellites, etc. In the telescope, the plastic material was introduced to the supporting tubes or rods connecting the primary mirror assembly and the secondary mirror structure. Nowadays, even the mirror itself is produced by CFRP. In this poster, material properties and production of CFRP telescopes are presented, and pros and cons are discussed.

• Journal of Information Display
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• 제3권4호
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• pp.4-7
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• 2002

A recently developed phase separated composite film method has been employed to fabricate a liquid crystal (LC) based electro-optical device using a single glass substrate. The resulting device is made of adjacent parallel layers of LC and polymer maded by phase separation. The LC layer is confined between the solidified polymer layer on one side and the glass substrate on the other. The electro-optical properties of these devices demonstrate their technological potential in light weight and hand-held electronic products.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 I
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• pp.402-405
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• 2003

본 논문은 인터넷에서 실시간 서비스를 효과적으로 지원하면서도 망의 확장성을 제공하는 방법을 제안하였다. 이를 위해 코어노드에서 각 플로우의 상태 정보를 관리하지 않는 SCORE (Scalable CORE) 네트워크 모델 [1]과 종단간 딜레이 보장이 우수한 QoS (Qualify of Service) 스케줄링 방법중 하나인 WF²Q+ (Worst-case Fair weight Fair Queuing+) [2]에 대해서 기술하고 구현하였다. 이러한 개념을 바탕으로 새로운 망의 구조를 제안하였으며 시뮬레이션을 통한 성능분석을 수행하였다.