• 제어로봇시스템학회논문지
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• 제15권1호
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• pp.82-88
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• 2009

The output of the encoder is a digital pulse, which is also easy to be connected to a digital controller. There are various angular velocity detecting methods of M, T, and M/T. Each of them has its own properties. There is a common limitation that the angular velocity detection period is strongly dependent on the destination velocity magnitude in case of ultimate low range. They have ultimately long detection period or cannot even detect angular velocity at near zero velocity. This paper proposes a zero velocity detectable sensor algorithm with the dual encoder system. The sensor algorithm is able to keep detection period moderately at near zero velocity and even detect zero velocity within nominal period. It is useful for detecting velocity in case of changing rotational direction at which there occurs zero velocity. In this paper, various experimental results are shown for the algorithm validity.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2002년도 춘계학술대회 논문집
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• pp.44-47
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• 2002

In order to make a doubly curved sheet metal effectively, a sheet metal forming process has been developed by adopting the flexibility of the incremental forming process and the principle of bending deformation which causes slight deformation to thickness. The developed process is an unconstrained forcing process with no holder. For this study, the experimental equipment is set up with the roll set which consists of two pairs of support rolls and one center roll. In the experiments using aluminum sheets and FEM simulation, it is found that the curvature of the formed sheet metal is determined by controlling the distance between supporting rolls in pairs and the forming depth of the center roll. The FEM simulation of the forming process using the roll set along the one path shows the distributions of the curvatures in two directions along the path, and gives information about the characteristics of the proposed forming process.

• 대한조선학회지
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• 제24권4호
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• pp.37-44
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• 1987

In order to perform a detailed analysis of large deflection behaviour of a rectangular plate, an efficient semi-analytical method is developed in this paper. The method is called Incremental Galerkin Method. This method is successfully applied to plates with initial deflection subjected to in-plane and out-of-plane loads to obtain the whole histories of the behaviour of these plates. Application of this method to rectangular plates with initial deflection is presented. Comparisons of results obtained by this method with those obtained by other methods are made and the validity of the method is demonstrated.

• Structural Engineering and Mechanics
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• 제4권1호
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• pp.91-107
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• 1996

In Lagrangian mechanics, attention is directed at the body as it moves through space. Each body point is identified by the position it would have if the body were to occupy an arbitrary reference configuration. A result of this approach is that the analyst often describes the body by using quantities that may involve more than one configuration. This is particularly common in incremental calculations and in changes of the choice of reference configuration. With the rise of very powerful computing machinery, the popularity of numerical calculation has become great. Unfortunately, the mechanical theory has been evolved in a piecemeal fashion so that it has become a conglomeration of differently developed patches. The current work presents a unified development of the equilibrium principle. The starting point is the conservation of momentum. All details of configuration are shown. Finally, full dynamic and static forms are presented for total and incremental work.

• Journal of Information Processing Systems
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• 제18권4호
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• pp.500-509
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• 2022

With the rapid development of educational informatization, teaching methods become diversified characteristics, but a large number of information data restrict the evaluation on teaching subject and object in terms of the effect of English education. Therefore, this study adopts the concept of incremental learning and eigenvalue interval algorithm to improve the weighted decision tree, and builds an English education effect evaluation model based on association rules. According to the results, the average accuracy of information classification of the improved decision tree algorithm is 96.18%, the classification error rate can be as low as 0.02%, and the anti-fitting performance is good. The classification error rate between the improved decision tree algorithm and the original decision tree does not exceed 1%. The proposed educational evaluation method can effectively provide early warning of academic situation analysis, and improve the teachers' professional skills in an accelerated manner and perfect the education system.

• Restorative Dentistry and Endodontics
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• 제25권1호
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• pp.91-108
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• 2000

Most of cervical abrasion and erosion lesions show gingival margin where the cavosurface angle is on cementum or dentin. Composite resin restoration of cervical lesion shrink toward enamel margin due to polymerization contraction. This shrinkage has clinical problem such as microleakage and secondary caries. Several methods to diminish contraction stress of composite resin restoration, such as modifying cavity form and building up restorations in several increments have been attempted. The purpose of this study was to compare polymerization contraction stress of composite resin in Class V cavity subjected to cavity forms and placement methods. In this study, finite element model of 5 types of Class V cavity was developed on computer tomogram of maxillary central incisor. The types are : 1) Box cavity 2) Box cavity with incisal bevel 3) V shape cavity 4) V shape cavity with incisal bevel 5) Saucer shape cavity. The placement methods are 1) Incisal first oblique incremental curing 2) Bulk curing. An FEM based program for light activated polymerization is not available. For simulation of curing dynamics, time dependent transient thermal conduction analysis was conducted on each cavity and each placement method. For simulation of polymerization shrinkage, thermal stress analysis was performed with each cavity and each placement method. The time-temperature dependent volume shrinkage rate, elastic modulus, and Poisson's ratio were determined in thermal conduction data. The results were as follows : 1. With all five Class V cavifies, the highest Von Mises stress at the composite-tooth interface occurred at gingival margin. 2. With box cavity, V shape cavity and saucer cavity, Von Mises stress at gingival margin of V shape cavity was lower than the others. And that of box cavity was lower than that of saucer cavity. 3. Preparing bevel at incisal cavosurface margin decreased the rate of stress development in early polymerization stage. 4. Preparing bevel at incisal cavosurface margin of V shape cavity increased the Von Mises stress at gingival margin, but decreased at incisal margin. 5. At incisal margin, stress development by bulk curing method was rapid at early stage. Stress development by first increment of incremental curing method was also rapid but lower than that by bulk curing method, however after second increment curing final stress was the same for two placement methods. 6. At gingival margin, stress development by incremental curing method was suddenly rapid at early stage of second increment curing, but final stress was the same for two placement methods.

• 의정연구
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• 제24권3호
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• pp.85-111
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• 2018

본 논문은 비정규직 보호제도가 해석 실행 집단의 주도적 권력 행위에 의해 규정 개정 여부와 관계없이 실질적 차원에서 제도변화를 경험해 왔다고 분석한다. 점진적 제도변화 이론을 통해 제도는 정치맥락 속에 끊임없이 재해석되는 동태적 성격을 가졌다는 데 주목하고 있다. 비정규직 보호제도는 단기계약반복, 정규직 외의 별도직군 형성, 차별 판단 회피의 방식으로 이면적 변화를겪어왔다. 이러한 제도의 전환적 변화는 제도적으로 '해석 실행의 재량수준'이 높고, 정치적으로 '제도변화 거부 가능성'이 낮아 발생할 수 있었다. 구체적으로 비정규직 범위, 사용기간 제한과 초과 시 근로계약 형태 및 고용의무, 차별금지 시정 규정에 대해 다양한 해석이 가능했다. 그리고 비정규직 조직률이 낮고 사회적 대화기구 내에서 노동계의 영향력이 위축되었을 뿐만 아니라 국회내 노동자정당 약화로 입법과정에서의 정치력이 약화되면서 전환적 제도변화를 거부할 가능성이 낮아졌다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 봄 학술발표회 논문집
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• pp.61-68
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• 1999

This paper is the study of methodology for development of preliminary structural design modules for an intergated system for reinforced concrete structures. To develop the modules. it is used that the iteratived and incremental development process of object-orientied methodology and affects. The aspect is a tool to capture characteristics of the objects. The aspects consists of .user, structure, and system. By using aspects, we can find that objects and relationships between the objects consisting of the modules in the phases of process. In this paper, UML(Unified Modeling Language) is used to the notation. It serves as the language for communicating decisions that are not obvious and provides semantics to capture all important stategic and tactical decisions. Therefore such a series of mothods is valuable to development of preliminary structural design modules. Then preliminary structural design modules were programed by using Visusl C++, a windows environmental development tool.

• 한국콘텐츠학회논문지
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• 제15권5호
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• pp.119-131
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• 2015

후발산업국인 한국 K-Pop의 인기는 독특하다. 추격이론의 관점에서 K-Pop의 등장을 분석한다면 창조산업의 전략적 방향설정에 도움이 될 수 있음에도 불구하고 관련 연구가 부족한 것이 사실이다. 이점에 착안해 본 연구는 K-Pop기업의 내부역량, 시장공략방향 그리고 제품전략을 기존에 연구되었던 제조기업 추격전략과 비교 분석할 것이다. 연구를 통해 첫째, K-Pop기업이 음악생산에서의 인하우스(수직통합) 시스템도입과 기업규모 확장을 통해 앨범제작이라는 비연속적 프로젝트를 효과적으로 수행하는 프로젝트 실행역량을 구축했음을 확인했다. 둘째, K-Pop기업들은 일찍부터 해외시장에 진출했고, 글로벌 시장에서 상품성을 검증받은 장르를 중심으로 기회의 창을 적절히 활용했다. 마지막으로, K-Pop기업은 앨범시장에서 점진적 혁신을 적극 활용했다. 이것은 한국 제조기업의 추격전략과도 유사점이 많기 때문에 앞으로 K-Pop기업들은 성장과정에서 한국 제조기업의 경험을 적극적으로 검토할 필요가 있을 것이다.

• 한국산학기술학회논문지
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• 제14권9호
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• pp.4524-4531
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• 2013

최근 국내 도시개발에 있어 도시재생사업의 재원조달기법으로 세입담보금융의 도입이 검토되고 있다. 이러한 미래의 수익을 담보한 새로운 재원조달기법의 도입 가치는 단순히 개발재원에 대한 자가재정조달 방안이 아닌, 도시개발사업의 선순환적 구조형성의 가능성을 높이는 잠재성과 함께 고려되어야 한다. 이는 민간자본의 주도로 이루어지는 국내 도시개발사업의 구조적 문제점에 대한 대응으로서 사업초기 공공부문의 재원투입으로 개발과정내 공공부문의 주도적 역할을 강화하며, 이를 통해 공공을 위한 사회적 가치의 증대와 개발사업자의 개발이윤을 동시에 확보하기위한 구조적, 제도적 뒷받침을 가능하게 한다. 이에 본 연구는 미국 도시개발 사업에서 적용된 세입담보금융의 대표적인 형태인 TIF에 대한 이론적 고찰을 통해 세입담보금융의 일반적 특성을 파악하고, TIF와 구조적, 개념적 특징을 공유하는 독특한 형태의 적용사례인 PILOT을 뉴욕시 허드슨 야드 개발을 중심으로 분석한다. 이를 통해 세입담보금융의 국내적용에 대한 제안사안을 중심으로 참조 가능한 시사점을 도출한다.