• 디지털융복합연구
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• 제14권7호
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• pp.117-126
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• 2016

본 연구는 인터넷환경하에서 콘텐츠의 정보속성과 인터넷이용자들의 커뮤니케이션과정과의 관계를 고찰하는데 있다. 이를 위하여 인터넷환경하에서 콘텐츠의 정보속성이 인터넷 이용자들의 커뮤니케이션을 통해서 어떻게 사회적 영향을 미치는지 살펴보고, 이용자들간의 사회적 영향이 구전활동과 어떠한 관계를 가지는지 살펴보고자 한다. 실증연구 결과 정보속성 가운데, 이해용이성, 관련성, 새로움은 인터넷이용자들간의 상호간의 커뮤니케이션에 긍정적인 영향을 미치는 인과관계를 확인할 수 있었고, 인터넷이용자들간의 커뮤니케이션은 이용자들의 내재화와 동조에 모두 긍정적인 영향을 주는 인과관계가 나타났다. 마지막으로 사회적 영향인 내재화와 동조는 인터넷이용자들의 구전활동에 긍정적인 영향을 미치는 결과를 보여주었다.

• 대한수학회보
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• 제59권5호
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• pp.1269-1277
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• 2022

In this paper we consider a sequence of polynomials defined by some recurrence relation. They include, for instance, Poupard polynomials and Kreweras polynomials whose coefficients have some combinatorial interpretation and have been investigated before. Extending a recent result of Chapoton and Han we show that each polynomial of this sequence is a self-reciprocal polynomial with positive coefficients whose all roots are unimodular. Moreover, we prove that their arguments are uniformly distributed in the interval [0, 2𝜋).

• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.227.2-227.2
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• 2005

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.573-578
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• 2004

This paper presents a methodology for the stiffness analysis of a low-DOF parallel manipulator. A low-DOF parallel manipulator is a spatial parallel manipulator which has less than six degrees of freedom. The reciprocal screws of actuations and constraints in each leg can be determined by making use of the theory of reciprocal screws, which provide information about reaction forces due to actuations and constraints. When pure force is applied to a leg, the leg stiffness is modeled as a linear spring along the line. For pure couple, it is modeled as a rotational spring about the axis. It is shown that the stiffness model of an F-DOF parallel manipulator consists of F springs related to actuations and 6-F springs related to constraints connected from the moving platform to the base in parallel. The $6{\times}6$ Cartesian stiffness matrix is obtained, which is the sum of the Cartesian stiffness matrices of actuations and constraints. Finally, a 3-UPU parallel manipulator is used as an example to demonstrate the methodology.

• 대한기계학회논문집A
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• 제29권5호
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• pp.680-688
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• 2005

This paper presents a methodology for the stiffness analysis of a low-DOF parallel manipulator. A low-DOF parallel manipulator is a spatial parallel manipulator which has less than six degrees of freedom. The reciprocal screws of actuations and constraints in each leg can be determined by making use of the theory of reciprocal screws, which provide information about reaction forces due to actuations and constraints. When pure farce is applied to a leg, the leg stiffness is modeled as a linear spring along the line. For pure couple, it is modeled as a rotational spring about the axis. It is shown that the stiffness model of an it_DOF parallel nipulator consists of F springs related to actuations and 6-F springs related to constraints connected from the moving platform to the base in parallel. The 6x f Cartesian stiffness matrix is derived, which is the sum of the Cartesian stiffness matrices of actuations and constraints. Finally, the 3-UPU, 3-PRRR, and Tricept parallel manipulators are used as examples to demonstrate the methodology.

• 한국사회복지학
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• 제65권2호
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• pp.179-201
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• 2013

1960년대의 개발 연대 이후 1990년대 중반까지 우리나라의 복지체제는 개발국가형 복지체제로 특징지을 수 있는데, 연복지를 비롯한 숨겨진 복지국가의 영역은 그것을 구성하는 핵심적 요소의 하나였다. 그러나 한국의 개발국가형 복지체제는 1990년대 중반 이후 대내외적인 변화 상황에서 더 이상 순조롭게 작동하지 못하고 해체되었다. 본 연구는 개발국가형 복지체제의 해체를 연복지의 쇠퇴에 초점을 두고 살펴보았다. 분석결과에 따르면, 지난 20년간 가족 간 이전소득과 공적 이전소득은 각각의 소득이 경상소득 중 차지하는 비중에 있어서, 또한 빈곤을 완화하는데 기여하는 정도에 있어서 상당히 변화하였음을 확인할 수 있다. 즉, 국가복지는 지난 20년 동안 성장한 반면, 연복지는 지난 20년간 쇠퇴한 것이다. 한국 복지체제의 변화를 위해서는 국가복지의 확대와 그에 기초한 재분배라는 생활조직화 방식의 강화가 필요하지만, 동시에 열린 공동체와 그에 기초한 호혜라는 생활조직화 방식의 발전 또한 필수적이다. 그러나 호혜의 발전가능성은 개발국가형 복지체제에서 중요한 역할을 수행했던 연복지를 복원하는 방식을 통해서는 불가능하다. 본 연구는 세 가지의 원리에 기초하여 작동하는 사회적 경제, 혹은 제 3섹터의 발전이 열린 공동체에 기초한 호혜를 발전시키는데 필요하다고 보며, 협동조합이 그와 관련하여 중요한 대안이 될 수 있음에 주목한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.631-637
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• 2005

This paper presents a stiffness analysis method for a low-DOF parallel manipulator, which takes into account of elastic deformations of joints and links. A low-DOF parallel manipulator is defined as a spatial parallel manipulator which has less than six degrees of freedom. Differently from the case of a 6-DOF parallel manipulator, the serial chains in a low-DOF parallel manipulator are subject to constraint forces as well as actuation forces. The reaction forces due to actuations and constraints in each limb can be determined by making use of the theory of reciprocal screws. It is shown that the stiffness model of an F-DOF parallel manipulator consists of F springs related to the reciprocal screws of actuations and 6-F springs related to the reciprocal screws of constraints, which connect the moving platform to the fixed base in parallel. The $6{times}6$ stiffness matrix is derived, which is the sum of the stiffness matrices of actuations and constraints. The six spring constants can be precisely determined by modeling the compliance of joints and links in a serial chain as follows; the link can be considered as an Euler beam and the stiffness matrix of rotational or prismatic joint can be modeled as a $6{times}6$ diagonal matrix, where one diagonal element about the rotation axis or along the sliding direction is zero. By summing the elastic deformations in joints and links, the compliance matrix of a serial chain is obtained. Finally, applying the reciprocal screws to the compliance matrix of a serial chain, the compliance values of springs can be determined. As an example of explaining the procedure, the stiffness of the Tricept parallel manipulator has been analyzed.

• 보건의료산업학회지
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• 제1권1호
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• pp.75-89
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• 2007

The start point of a franchise system such as Lotteria was in 1979. Since 1990, the franchise systems in Korea have rapidly spread over all industry types. As 'Franchise Law' was enforced in 2002, the expansion of a franchise picked up its' speed. The barbers and beauty parlors business has the same expansion trend. However, there was no study about the franchise systems in the barbers and beauty parlors business. The purpose of this study was to find the goodness of fit of the structured equation model proposed and identify the significances of relationships in the variables of justice perceptions, trust, satisfactions, business performances, switching barriers, switching cost etc. This study tries to find a solution for a good development between franchisor and franchisee in the barbers and beauty parlors business in Korea. The theoretical considerations about justice of this study is limited in reciprocal relation justice and procedure justice. And it did make simplify for trust, satisfaction, business performance, switching barrier. And switching barrier did measure as dimension of switching coot. From October 26, 2005 to October 29, this study collected 250 survey questionnaires from the franchisees located in Seoul, Busan, Daegu, Ulsan, and Keoyng-Nam. In analyses of using SPSS Windows 11.0 and LISREL 8.14, this study used 208 cases because 48 cases did not response appropriately. Tn conclusions. reciprocal justice perception and procedure justice jointly determined trust. Secondly, reciprocal justice perception significantly determined satisfaction. Procedure justice perception negatively determined satisfaction, but this relationship was not significant. Thirdly, reciprocal justice perception positively influenced business performance, and procedure justice negatively influenced business performance, but the last relationship was not significant Fourthly, trust positively significantly influenced satisfaction and business performance. Fifthly, satisfaction positively influenced business performance and true determined switching barrier positively. This study shows following: firstly, a composition concept did make structural relationship and secondly, a reciprocal relation justice of a franchisor did appear as an important variable and it gives positive influence to trust, satisfactions, business performance, switching barriers of the franchisees.

• 지구물리와물리탐사
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• 제2권2호
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• pp.112-121
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• 1999

This article reviews the development of geophysical inverse theory. In a series of articles published in 1967, 1968, and 1979, G. Backus and F. Gilbert a trade-off between model resolution and estimation errors in geophysical inverse problems, and gave a criterion to compromise the reciprocal relation. Although the criterion was not clear in the physical point of view, it had been extensively used in the interpretation of geophysical date in the 1970s. This was the starting point of the fruitful development of inverse theory in geophysics. A reasonable criterion to compromise the reciprocal relation was derived to solve linear problems by D. D. jackson in 1979, introducing the concept of a priori information about unknown model parameters. This Jackson's approach was extended to solve nonlinear problems on the basis o probabilistic approach to the inverse problems formulated by A. Tarantola and B. Vallete in 1982. At the end of 1980s ABIC (Akaike Bayesian Information Criterion) was introduced for selecting a more reasonable model in geophysics. Now the date inversion is regarded as the process of extracting new information from observed data, combining in with a priori information about model parameters, and constructing a more clear image of model.

• 한국비블리아학회지
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• 제25권3호
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• pp.139-163
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• 2014

본 연구는 '아래로부터의 역사' 서술과 기록물 유형별 관계를 고찰하면서 영국 기록관리의 전반적인 흐름을 파악하고자 했다. 이를 위해 1960년대부터 영국에서 진행되었던 역사워크숍운동과 역사워크숍저널에 발표된 논문들을 분석했다. 이들은 공공기록은 물론 신문, 일기, 편지, 구술 등 다양한 기록을 활용했다. 비록 역사워크숍 운동은 퇴조했지만 공동체 아카이브의 활성화에 큰 영향을 미쳤다. 21세기 들어와 공공기관도 이러한 흐름에 동참하면서 기록의 사회적 역할 확대에 기여하고 있다. 또한 기록의 정보자원화라는 기록관리 환경의 변화를 더불어 '아래로부터의 역사' 서술을 위한 새로운 토양이 만들어지고 있다.