• International Journal of Aeronautical and Space Sciences
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• 제8권1호
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• pp.87-94
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• 2007

Tilt rotor-wing concept to show enhanced performance in low speed mission is presented. Three types of stud wings on the existing tilt rotor configuration are suggested and their characteristics are compared. Aerodynamic analysis indicates that the stud wing concept gives significant performance improvement on the endurance and range in the low speed regime when compared with the tilt rotor. Penalties of the stud wing are discussed from the perspectives of conversion corridor, structural weight, configuration design, and cross wind stability. This study concludes that the advantage of the stud wing in general UAV mission performance is so significant as to surpass the penalties in other perspectives investigated.

• 한국산학기술학회논문지
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• 제14권10호
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• pp.4685-4693
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• 2013

본 연구는 FMM 방식을 사용하는 OLED 디스플레이의 증착공정에서 사용되는 마스크 프레임의 무게를 최소화하기 위한 형상최적설계를 다루었다. 위상최적화 해석을 수행하였으며 그 결과를 토대로 프레임의 가로 및 세로변에 슬롯을 삽입함으로써 강성을 증가시키면서 무게를 저감시킬 수 있는 설계 개념을 도출하였다. 프레임의 형상설계변수를 정의하고 형상최적설계 문제를 정립하여 수치적 최적화를 수행하였다. 프레임의 설계기준인 최대 변위의 제약조건을 만족하면서 무게가 최소인 프레임의 최적형상을 성공적으로 구하였으며, 최적설계된 프레임의 무게는 117.6 kg으로 최초설계안 256 kg 대비 138.4 kg(54.1%)가 감소된 결과를 얻었다.

• 건축역사연구
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• 제22권6호
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• pp.23-34
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• 2013

The purpose of this study is to look into the weight-lightening phenomenon of the roof structure of some Hanok(韓屋), the Korean traditional houses found from the survey on the distribution and actual state of urban traditional houses existing in the whole region of Jung-gu, Daegu, Korea. As a result of judging from the pre-test of building registers for the research area, approximately 5,000 wood structure houses were found. A field data survey based on these findings showed that there are 1,752 Hanok houses. And the further classification of the Korean traditional houses by roof structure type shows that about 35% of them underwent weight lightening. While this kind of light-weight Hanok is different from the concept of traditional Hanok, they also show the survival method of Hanok that reflects the economical and technological phases of that period. It is expected that deeper understanding on the urban traditional houses will be possible through carrying out in-depth researches on techniques of the light-weight roof structure of the urban traditional houses that are supposed to have functioned as dwellings as commercial products.

• 한국군사과학기술학회지
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• 제12권3호
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• pp.333-343
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• 2009

Tactical Information Communication Network(TICN) is a concept-type integrated Military Communication system that enables precise command control and decision making by unifying the diversified military communication network and conveying diverse range of battle field information on real-time, at right place at right time. TICN is designed to advance into high speed, large capacity, long distance wireless relay transmission. To support mobility in battlefield environments, the application of Ad-hoc networking technology to its wireless communication has been examined. Ad-hoc network is consist of mobile nodes and nodes in the network depends on the cooperation of other nodes for forwarding of packets. In this context, some non-cooperating nodes may delay forwarding of packets or drop the packets. This may hamper the network as a whole and disrupt communication between the cooperating nodes. To solve this problem, we present a solution with a Node Weight Management Server(NWMS), which manages each node's weight according to its behavior in local area. When the NWMS detects misbehaving node, it increases the node's weight. If the node's weight exceeds a predefined threshold then the NWMS broadcasts the node's information into network to isolate the misbehaving node from the network. These mechanisms show that they are highly effective and can reliably detect a multitude of misbehaving node.

• 정신신체의학
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• 제4권1호
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• pp.3-12
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• 1996

Objects : This study was attempted to evaluate the body image and the self concept in high risk adolescents for eating disorders. Methods 589 middle school students were investigated with EAT(Eating Attitude Test) and BITE(Bulimic Investigatory Test Edinburgh) and Schematic Figures(Child/Adolescent Version) and Piers-Harris Self-Concept Scale. According to the score of EAT and BITE, three high risk groups(high EAT group, high BITE group, high EAT & BITE group) were identified. Three groups were examined in terms of sex, weight, self concept and body image. Each group was EAT group, BITE group, EAT & BITE group Results: The results of the study were as follows : 1) EAT & BITE group showed greatest body image distortion. 2) BITE group and EAT & BITE group showed lower score in self concept scale. 3) The majority of EAT group were boys, BITE group and EAT & BITE group were mostly girls. 4) All three high risk groups, especially Bin group, revealed overweight compared with normal control group. Conclusions : High BITE group and high EAT & BITE group could be considered as significantly high risk groups for eating disorders, showing overweight, severe body image distortion, and poor self concept. EAT score alone seemed not to discriminate high risk adolescents for eating disorders.

• Journal of Biosystems Engineering
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• 제31권4호
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• pp.305-314
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• 2006

Precision farming has been known as an environment friendly farming technology. This study was conducted to develop a variable-rate granule fertilizer applicator as an attempt for introducing the precision farming technologies to rice cultivation in Korea. In this paper, concept design process and manufacturing of prototype variable rate granule applicator was reported. For concept design, some design guide lines were selected. Based on the design guide line and some engineering knowledge, concept design was conducted. The designed prototype granule applicator was mounted at the rear of riding type cultivator for paddy field and had a 10m wide boom structure with pneumatic conveying and application system as well as 1GPS receiver, 1 granule hopper, 12 blow heads, 2 metering devices and 1 controller. The fertilizer applicator had 942 ka of weight, 740m of ground clearance and 1,117mm of center of gravity from the ground. The applicator was designed to be able to $34{\sim}428kg/ha$ of granule at $0.2{\sim}0.8m/s$ of fertilizer working speed.

• 여성건강간호학회지
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• 제17권4호
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• pp.317-327
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• 2011

Purpose: This study was conducted to analyze and clarify the concept of the effective breastfeeding. Methods: This study used Walker and Avant's process of concept analysis. Results: Effective breastfeeding is how to give infant adequate milk, which fulfills needs of mother and infant, from her breast so that they can be satisfied with the process and results. It included the effective breastfeeding properties as follows: feeding behaviors (positioning, latch on, and suckling), transferring a breast milk to an infant, mother-infant interaction, and satisfying their desires (satisfaction, comfort, mother's self-confidence, infant's adequate weight gain and defecation, adequate breastfeeding interval). The antecedent of effective breastfeeding were anatomical and functional normal breast, breastfeeding knowledge and steady-state of mother, and feeding desire, rooting reflex and normal oral cavity of infant. The consequences of effective breastfeeding were exclusive breastfeeding, infant and maternal health and wellbeing, and achievement of mother and infant attachment. Conclusion: The meaning of effective breastfeeding defined in this study will contribute to develop the effectiveness breastfeeding assessment tool and the nursing intervention for ineffective breastfeeding.

• 한국자동차공학회논문집
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• 제22권3호
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• pp.12-18
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• 2014

This paper describes about the development of new concept's rear wheel guards for the reduction of Road Noise in the passenger vehicle using test. The new wheel guards are proposed by various frequency chamber concept and different textile layers concept. Two wheel guards were verified by small cabin resonance test and vehicle test. Through new developing process without vehicle test, Result of road noise will be expected when new concepts and materials of wheel guard is applied into automotive vehicle. As a result of the application of Aimed Helmholtz and Multi-layers concept, this paper classifies the road noise, cost and weight are reduced by new concepts and the solutions are adopted into the 2 cars.

• 한국지구과학회지
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• 제25권4호
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• pp.214-221
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• 2004

본 연구에서는 현행 제7차 교육과정의 중학교 과학교과에서 제시된 대기압 개념을 분석하여 무게의 측면으로 대기압을 설명하는 교과서를 이용한 수업(수업방안 A)과 기체 분자운동과 무게의 양쪽 측면에서 설명하는 교과서를 이용한 수업(수업방안 B)의 두 가지 수업방안을 선정한 후 수업방안이 중학생들의 대기압 개념변화에 미치는 영향에 대하여 알아보았다. 이를 위하여 중학교 3학년 4개 학급을 대상으로 2개 학급씩 나누어 각각 수업을 실시하였다. 이 때 수업 전-후에 나타나는 학업 성취도와 대기압의 개념변화를 조사해본 결과는 다음과 같다. 첫째, 학업 성취도에 미치는 효과는 '수업방안 B'가 '수업방안 A'에 비해서 효과가 있는 것으로 나타났다. 둘째, 개념변화에 미치는 효과는 개념 검사의 사후 점수를 각 하위척도별로 효과를 검증한 결과, 개념의 요소 4개 중 3개의 요소인 '대기압이 작용하는 원리'와·대기압이 작용하는 방향과 이유', '지표면의 온도 상승에 따른 기압 변화와 그 이유'에서는 개념 변화에 유의미한 향상이 있는 것으로 나타났으나 '고도에 따른 대기압의 분포와 그 이유'에서는 개념 변화에 있어 유사한 것으로 나타났다. 셋째, 대기압 개념의 올바른 수업방안으로는 대기압을 기체 분자 운동론의 입장에서 정의하고 높이에 따른 대기업의 크기 분포는 공기의 무게로 정의한 것과 결과가 같게 나타남을 강조할 필요가 있다.

• 한국지구과학회:학술대회논문집
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• 한국지구과학회 2004년도 춘계학술발표회 논문집
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• pp.2-12
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• 2004

본 연구에서는 현행 제7차 교육과정의 중학교 과학교과에서 제시된 대기압 개념을 분석하여 무게의 측면으로 대기압을 설명하는 교과서를 이용한 수업(수업방안 A)과 기체 분자운동과 무게의 양쪽 측면에서 설명하는 교과서를 이용한 수업(수업방안 B)의 두 가지 수업방안을 선정한 후 수업방안이 중학생들의 대기압 개념변화에 미치는 영향에 대하여 알아보았다. 이를 위하여 중학교 3학년 4개 학급을 대상으로 2개 학급씩 나누어 각각 수업을 실시하였다. 이 때 수업 전-후에 나타나는 학업 성취도와 대기압의 개념변화를 조사해본 결과는 다음과 같다. 첫째, 학업 성취도에 미치는 효과는 ‘수업방안 B'가 ‘수업방안 A’에 비해서 효과가 있는 것으로 나타났다. 둘째, 개념변화에 미치는 효과는 개념 검사의 사후 점수를 각 하위척도별로 효과를 검증한 결과, 개념의 요소 4개 중 3개의 요소인 ‘대기압이 작용하는 원리’와 ‘대기압이 작용하는 방향과 이유’, ‘지표면의 온도 상승에 따른 기압 변화와 그 이유’에서는 개념 변화에 유의미한 향상이 있는 것으로 나타났으나 ‘고도에 따른 대기압의 분포와 그 이유’에서는 개념 변화에 있어 유사한 것으로 나타났다. 셋째, 대기압 개념의 올바른 수업방안으로는 대기압을 기체 분자 운동론의 입장에서 정의하고 높이에 따른 대기압의 크기 분포는 공기의 무게로 정의한 것과 결과가 같게 나타남을 강조할 필요가 있다.