구속조건을 이용한 부정정 구조의 정적 해석에 관한 연구

은희창,서일교 제주대학교 산업기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.1

This paper presents an explicit static-equilibrium equation of indeterminate structures to satisfy the compatibility conditions. The static analysis of indeterminate structures considers the equilibrium of forces as well as the compatibility conditions. The satisfaction of the compatibility conditions also requires the constraint forces. In this paper, the new equilibrium equation to consider the conditions is derived by minimizing the performance index, which is the function of the difference of the real displacements and the displacements of unconstrained structures without the conditions. Through a simple static analysis of indeterminate structure, it was observed that the weight matrix in the performance index takes the stiffness matrix. And Nature takes the constraint forces as the minimum values of all forces to satisfy the given geometric conditions. Also, several examples illustrated the validity of the proposed method.

구속조건을 이용한 부정정 구조의 정적 해석에 관한 연구

은희창,서일교 濟州大學校 産業技術硏究所 2001 산업기술연구소논문집 Vol.12 No.1

This paper presents an explicit static-equilibrium equation of indeterminate structures to satisfy the compatibility conditions. The static analysis of indeterminate structures considers the equilibrium of forces as well as the compatibility conditions. The satisfaction of the compatibility conditions also requires the constraint forces. In this paper. the new equilibrium equation to consider the conditions is derived by minimizing the performance index. which is the function of the difference of the real displacements and the displacements of unconstrained structures without the conditions. Through a simple static analysis of indeterminate structure. it was observed that the weight matrix in the performance index takes the stiffness matrix. And Nature takes the constraint forces as the minimum values of all forces to satisfy the given geometric conditions. Also. several examples illustrated the validity of the proposed method.

회전익 항공기 무선설비 전파 적합성평가를 위한 기술기준의 환경적 조건 고찰 및 제안

장준혁,이동혁,최종호,오상철,장재상 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4

군용 등 특수한 목적으로 운용하거나, 해외에서 도입되는 항공기를 제외한 국내에서 운용하는 항공기에 장착되는 무선통신장비는 원활하고 안전한 사용을 위해서 국립전파연구원에서 공고한 “무선설비의 적합성평가 처리방법”의 적용을 받는다. 국내에서는 주로 국방력 증강 또는 연구개발 목적으로 항공기를 개발하였기 때문에 해당 공고의 항공기 무선통신장비용 기술기준은 여태 적용되었던 사례가 없다. 그러나 최근 산림청 등 공공기관에서 운용할 목적으로 육군의 수리온 항공기를 기반으로 한 회전익 항공기 개발이 진행되고 있어 해당 공고에서 요구하는 항공기 무선통신장비용 기술기준의 실제 적용이 예상된다. 상기 사유로 본 기술기준을 연구한 결과 환경적 조건의 변경 필요성이 식별되었고, 이에 대한 의견을 제시하고자 한다. The telecommunication equipment installed in the domestic demand aircraft shall be applied the Radio Frequency Compatibility Assessment notified by the National Radio Research Agency to use radio frequency stably and safely except special purpose operation such as military use. In South Korea, the Assessment has not been applied at all until now because the aircraft has been developed to build up military strength or to conduct research mainly. However, it is expected to apply soon to the aircraft which is now developing based on the ROKA (Republic of Korean Army) Surion platform to supply to the Public Institutions such as the Korea Forest Service. From the reason above, there has been a study for the Assessment criteria and it is considered to change on the environmental condition.

비행하중 조건에서 항공기 외부장착 포드의 비행적합성 검증을 위한 구조안전성 검증

조우제,최동설,박진보,안선규 한국정밀공학회 2024 한국정밀공학회지 Vol.41 No.4

A pod mounted on an aircraft external must be installed on an aircraft after its structural safety is verified under flight conditions. This paper presents methods of flight load and test load generation. Evaluation of test result data and standards for failure mode are also presented. First of all, to verify the static structural stability, flight loads for the aircraft maneuvering conditions were calculated. Finite element analysis was then performed with flight loads. As a result of the analysis, structures were verified to have a margin of safety for a given design requirement. In addition, it was confirmed that the launcher tube had enough rigidity to support the missile. Thus, the role of stinger such as longeron and hardback was insignificant. Finally, based on results of tests and analysis, the static structural stability of pod was substantiated and the reliability and effectiveness of the analysis model were obtained. These results and dynamic stability verification results suggest that an optimal design is necessary.

有限幅 異材結合板材에서의 Mode Ⅰ 龜裂 應力擴大係數 解析(Ⅰ)

崔鎔湜,梁源鎬,李甲來 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.2

This paper presents the theoretical analysis of the crack tip stress intensity factor for a center crack in a finite width bimaterial plate. The analysis is based on the integral equation and the complex stress function, where the unknown real stress function are determined from the boundary conditions. The Gauss-Laguerre numerical integral method is employed in numerical calculations. The stress intensity correction factor F(α) is given in the integral form; F(α)=1 + ∫_0^α K(t_1, u)du where α = α/W_1 : Dimensionless crack length K_(t,u : Kernel The correction factor value varies with the width ratio ω_0, The correction factor F(α) is influenced by the width ratio ω_0 within 12% at the infront of the bimaterial interface (α=0.9) in spite of the same λ value. For the case of λ(=E_2/E_1) = 1 or λ = 0 (homogeneous material) the correction factor values agree well with Feddersen's result in the range of α<0.7. In all cases, as α approaches to 1 (bimaterial interface), the correction factor value increases rapidly for λ<1, and decreases rapidly for λ>1.

COMMON FIXED POINT THEOREMS OF MEIR-KEELER TYPE ON MULTIPLICATIVE METRIC SPACES

Bhavana Deshpande,Sajad Ahmad Sheikh 한국수학교육학회 2016 純粹 및 應用數學 Vol.23 No.2

In this paper, we present some common fixed point theorems for two pairs of weakly compatible self-mappings on multiplicative metric spaces satisfying a generalized Meir-Keeler type contractive condition. The results obtained in this paper extend, improve and generalize some well known comparable results in literature.

TRIPLED COINCIDENCE AND COMMON TRIPLED FIXED POINT THEOREM FOR HYBRID PAIR OF MAPPINGS SATISFYING NEW CONTRACTIVE CONDITION

Bhavana Deshpande,Amrish Handa 영남수학회 2016 East Asian mathematical journal Vol.32 No.5

We establish a tripled coincidence and common tripled fixed point theorem for hybrid pair of mappings satisfying new contractive condition. To find tripled coincidence points, we do not use the continuity of any mapping involved therein. An example is also given to validate our result. We improve, extend and generalize several known results.

TRIPLED COINCIDENCE AND COMMON TRIPLED FIXED POINT THEOREM FOR HYBRID PAIR OF MAPPINGS SATISFYING NEW CONTRACTIVE CONDITION

Deshpande, Bhavana,Handa, Amrish The Youngnam Mathematical Society 2016 East Asian mathematical journal Vol.32 No.5

We establish a tripled coincidence and common tripled fixed point theorem for hybrid pair of mappings satisfying new contractive condition. To find tripled coincidence points, we do not use the continuity of any mapping involved therein. An example is also given to validate our result. We improve, extend and generalize several known results.

Semantic Compatibility Condition in American English: A Big Data-based Trend Analysis of Ethnic Slurs

윤수원(Suwon Yoon) 한국생성문법학회 2021 생성문법연구 Vol.31 No.1

The goal of this paper is to propose a Compatibility Condition for multiple expressive elements in American English. In exploring the collocation patterns of ethnic slurs, negative nigger vs. positive nigga, with other expressives, I suggest the systematicity in interaction between various expressive items. A big data-based trend analysis answers the following questions: First, how are the multiple occurrences of expressives with varying attitudes constrained? To capture the dynamic paradigm of co-occuring expressives, I re-evaluate the validity of the Compatibility Condition (CC) with big data in American English. Second, why are there exceptional cases that do not conform to the CC? I discuss how such intentional flout is employed to trigger special pragmatic effects. Theoretical implications include: (i) establishing the positive emotive stance of nigga, contrary to general conception of negativity in slurs; (ii) proposing the CC in American English; and (iii) supporting the notion of multidimensionality.

Senti-words in English and Vietnamese

Hamy Vu,윤수원 경희대학교 언어정보연구소 2024 언어연구 Vol.41 No.2

This research investigates the interaction between sentiment analysis and expressive elements in Vietnamese. We examine how the co-occurrence of various expressive elements, such as racial slurs and honorifics, influences the overall sentiment conveyed. By employing Sentic analysis, we categorize these elements based on their inherent sentiment (positive, negative, or neutral) and examine how their co-occurrence adheres to, or deviates from, the principles of Conditional Autonomy. We address two key questions: first, can expressive elements co-occur freely? While multiple occurrences of identical expressives are possible, the study investigates if different expressives, especially conflicting ones, interact freely or under specific constraints. The Compatibility Condition Model (CCM) and the Compatibility Condition Index (CCI) are introduced to explain these potential limitations. Second, if limitations exist, how precisely do they have an impact on each other? What happens if the restrictions are violated? We show how people sometimes disregard these constraints to achieve a particular communicative effect. This analysis supports the notion of multidimensionality (Potts 2005) onwards and the newfound hybrid nature of Conditional Autonomy. This concept suggests that expressive elements have some level of independence while still influencing each other.