• 가정과삶의질연구
• /
• 제17권1호
• /
• pp.87-102
• /
• 1999

The purpose of this study is to discuss Faimly Business. Family Business means a business that is owned and managed by one or more family members,. Family Business is defined as one in which at 51% of the business is owned by a single family and at least one and more family members are involved in the management activities in addition to which transfer of leadership to next generation family member is anticipated. This study is to examine a clear understanding of the relationship between family functioning and business viability in families who own and operate businesses. The Overall objectives of this study are first to introduce the Family Business in the Home Economics Consumer Studies and Family Resource Management field second to theoretically review definition of Family business and related concepts bivalent attributes of Family Business the dual relationship of the social and business functions in the Family Business the dual relationship of the social and business fun tions in the Family Business, Family Business is characterized by the dual relationship of two naturally separate functions; the social function(the family) and the business function(the family business). The family in it's social function satisfies different social and emotional needs. On the other hand the business function is result-oriented the decision -marking process and behavioral pattern must be based on an objective economic model in order for the family business to compete and survive It's important to handle the overlap between the social and the business functions of Family Business and offers some guidelines on how to address with the overlap problems This study is a useful instrument for researcher educators practitioners and policy makers.

• Current Optics and Photonics
• /
• 제6권3호
• /
• pp.252-259
• /
• 2022

In this paper, a dual-function dynamically tunable metamaterial absorber is proposed. At frequency points of 1.545 THz and 3.21 THz, two resonance peaks with absorption amplitude of 93.8% (peak I) and 99.4% (peak II) can be achieved. By regulating the conductivity of photosensitive silicon with a pump laser, the resonance frequency of peak I switches to 1.525 THz, and that of peak II switches to 2.79 THz. By adjusting the incident polarization angle by rotating the device, absorption amplitude tuning is obtained. By introducing two degrees of regulation freedom, the absorption amplitude modulation and resonant frequency switching are simultaneously realized. More importantly, dynamic and continuous adjustment of the absorption amplitude is obtained at a fixed resonant frequency, and the modulation depth reaches 100% for both peaks. In addition, the sensing property of the proposed MMA was studied while it was used as a refractive index sensor. Compared with other results reported, our device not only has a dual-function tunable characteristic and the highest modulation depth, but also simultaneously possesses fine sensing performance.

• 한국콘텐츠학회논문지
• /
• 제16권10호
• /
• pp.711-718
• /
• 2016

본 연구는 이중과제 훈련이 만성기 뇌졸중 환자들의 균형 능력 및 상지기능에 미치는 효과를 알아보고자 실시되었다. 경상북도 A병원에 내원한 뇌졸중 17명을 대상으로 하였으며, 이중과제 훈련은 전 후 평가를 제외한 총 4주 동안 주 5회 30분씩 실시하였다. 평가도구는 버그균형 척도(Berg Balance Scale), BTS FreeEMG 300(BTS FreeEMG 300, BTS, Italy)이 사용되었다. 연구 결과 이중과제 훈련 실시 전에 비하여 실시 후 만성기 뇌졸중 환자들의 BBS 점수에서 유의미한 변화가 나타났고(p<.05), CCR값에서도 어깨 및 팔꿈치 관절 동작 모두에서 음의 값이 나타나 긍정적인 변화가 있었다. 본 연구의 결과로 볼 때 이중과제 훈련이 만성기 뇌졸중 환자들의 균형 능력 및 상지기능 향상에 긍정적인 효과의 가능성을 확인할 수 있었다.

• 융합정보논문지
• /
• 제10권6호
• /
• pp.217-227
• /
• 2020

본 연구는 만성기 뇌졸중 환자에서 이중과제 훈련이 균형, 상지기능, 일상생활활동 수행능력에 미치는 효과를 알아보고자 실시하였다. 14명의 만성기 뇌졸중 환자를 대상으로 7명은 이중과제 훈련을, 7명은 단일과제 훈련을 주 3회, 회당 30분, 4주간 실시하였다. 균형능력의 평가는 Balance Trainer 4(BT 4)를 사용하였고, 상지기능은 젭슨-테일러 손 기능 평가(JTT)를, 일상생활활동 수행능력 평가는 한글판 수정바델지수(K-MBI)를 사용하였다. 중재 후, 이중과제 훈련군이 BT 4, JTT에서 유의한 변화를 보였다(p<.05). 두 그룹 간의 차이도 BT 4, JTT에서 유의한 차이를 보였다(p<.05). K-MBI 점수의 향상은 있었지만 유의한 차이는 보이지 않았다(p>.05). 이중과제 훈련군이 만성기 뇌졸중 환자의 균형, 상지기능, 일상생활활동 수행능력을 향상하는데 도움이 될 것으로 사료된다.

• 한국수학교육학회지시리즈B:순수및응용수학
• /
• 제20권2호
• /
• pp.129-136
• /
• 2013

We research properties of ternary numbers with values in ${\Lambda}(2)$. Also, we represent dual ternary numbers in the sense of Clifford algebras of real six dimensional spaces. We give generation theorems in dual ternary number systems in view of Clifford analysis, and obtain Cauchy theorems with respect to dual ternary numbers.

• 재활치료과학
• /
• 제9권2호
• /
• pp.7-25
• /
• 2020

목적 : 본 연구는 뇌졸중 환자를 대상으로 한 이중과제 훈련(Dual-task training)의 효과를 알아본 연구들을 분석하는 것을 목적으로 한다. 연구방법 : NDSL, RISS, PubMed, CoChrane, EMBASE를 통해 지난 10년 간 국내외 학술지에 게재된 논문들을 검색하였고, 최종적으로 10개의 논문을 선정하였다. 이를 전통적 단일계층 근거 모형에 따른 질적평가를 시행하고, Comprehensive Meta Analysis 3.0 프로그램을 통해 메타분석을 시행하였다. 결과 : 선정된 10편의 논문의 질적 수준은 모두 전통적 단일계층 근거 모형의 I과 II에 해당되어 높은 편에 속했다. 이중과제 훈련을 구성하고 있는 운동과제로는 7편의 문헌에서 보행 또는 균형 과제를 선택했으며, 3편의 연구에서 상지운동 관련 과제를 선정하였다. 메타분석을 실시한 결과 일상생활활동 수행능력이 0.65, 인지기능이 0.64로 보통(medium) 효과크기로, 하지운동 기능과 상지운동 기능은 각각 0.34와 0.22로 작은(small) 효과크기를 보였다. 일상생활활동 수행능력과 인지기능의 효과크기만 통계학적으로 유의미하였다(p<0.05). 결론 : 본 연구를 통해 이중과제 훈련이 뇌졸중 환자의 일상생활활동 수행능력 및 인지기능 회복에 유용한 중재기법이 될 수 있음을 확인하였다. 이는 국내 임상 환경에서 뇌졸중 환자에게 적절한 중재방법을 선정할 때 도움이 될 만한 자료로 활용될 수 있을 것이다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권4호
• /
• pp.1961-1974
• /
• 2019

In this letter, a harmonic-mean-based dual-antenna selection scheme at relay node is proposed in two-way relaying networks (TWRNs). With well-designed distributed orthogonal concatenated Alamouti space-time block code (STBC), a dual-antenna selection problem based on the instantaneous achievable sum-rate criterion is formulated. We propose a low-complexity selection algorithm based on the harmonic-mean criterion with linearly complexity $O(N_R)$ rather than the directly exhaustive search with complexity $O(N^2_R)$. From the analysis of network outage performance, we show that the asymptotic diversity gain function of the proposed scheme achieves as $1/{\rho}{^{N_R-1}}$, which demonstrates one degree loss of diversity order compared with the full diversity. This slight performance gap is mainly caused by sacrificing some dual-antenna selection freedom to reduce the algorithm complexity. In addition, our proposed scheme can obtain an extra coding gain because of the combination of the well-designed orthogonal concatenated Alamouti STBC and the corresponding dual-antenna selection algorithm. Compared with the common-used selection algorithms in the state of the art, the proposed scheme can achieve the best performance, which is validated by numerical simulations.

• 충청수학회지
• /
• 제26권4호
• /
• pp.723-734
• /
• 2013

A robust optimization problem, which has a maximum function of continuously differentiable functions as its objective function, continuously differentiable functions as its constraint functions and a geometric constraint, is considered. We prove a necessary optimality theorem and a sufficient optimality theorem for the robust optimization problem. We formulate a Wolfe type dual problem for the robust optimization problem, which has a differentiable Lagrangean function, and establish the weak duality theorem and the strong duality theorem which hold between the robust optimization problem and its Wolfe type dual problem. Moreover, saddle point theorems for the robust optimization problem are given under convexity assumptions.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제13권1호
• /
• pp.41-53
• /
• 2009

A primal-dual interior point method(IPM) not only is the most efficient method for a computational point of view but also has polynomial complexity. Most of polynomialtime interior point methods(IPMs) are based on the logarithmic barrier functions. Peng et al.([14, 15]) and Roos et al.([3]-[9]) proposed new variants of IPMs based on kernel functions which are called self-regular and eligible functions, respectively. In this paper we define a new kernel function and propose a new IPM based on this kernel function which has $O(n^{\frac{2}{3}}log\frac{n}{\epsilon})$ and $O(\sqrt{n}log\frac{n}{\epsilon})$ iteration bounds for large-update and small-update methods, respectively.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제22권2호
• /
• pp.101-113
• /
• 2018

The dual singular function method(DSFM) is a numerical algorithm to get optimal solution including corner singularities for Poisson and Helmholtz equations. In this paper, we apply DSFM to solve heat equation which is a time dependent problem. Since the DSFM for heat equation is based on DSFM for Helmholtz equation, it also need to use Sherman-Morrison formula. This formula requires linear solver n + 1 times for elliptic problems on a domain including n reentrant corners. However, the DSFM for heat equation needs to pay only linear solver once per each time iteration to standard numerical method and perform optimal numerical accuracy for corner singularity problems. Because the Sherman-Morrison formula is rather complicated to apply computation, we introduce a simplified formula by reanalyzing the Sherman-Morrison method.