• 대한가정학회지
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• 제39권2호
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• pp.111-130
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• 2001

Using the 1996 Expenditure Survey of Urban Famines from the Korea National Statistics Office, this study examines the economic status and the inequality of the elderly households. To explain the inequality of the single elderly households, this study divides the elderly into three groups of single, couple, and Living with admit children, and compares the total household income, total household expenditure and the net saving amount of these three groups. The results of Gini coefficients and Lorenz curries show that the inequality is higher in the single elderly household than couple elderly households or living with adult children elderly households. To investigate the reason of the inequality, this study compares the income, expenditure, and net saving amount by working condition of the household head in each three group. The result implies the need of employment to get household income especially for the single elderly who are in the higher inequality economic condition.

• 대한가정학회지
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• 제40권5호
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• pp.159-177
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• 2002

The purpose of this exploratory study was to investigate how the information society affected the attitude about the family/kinship life of Netizen. For this goal, the data were collected from 305 Netizen who use the Internet. The major findings were as follows. Firstly, In Netizen, the support to familism and boy preference was low level. Secondly, in their altitude to the divorce and remarriage, there was a tendency which accepts a marriage with selection. Thirdly, they had a tendency to agree equal partnership in couple relationship. Fourthly, virtual community in cyber-space was found, but the loyalty of members was not enough strong. Fifthly, in the family/kin rites, it was showed non-traditional tendency. And in all aspects, some differences were found between men and women. The findings of the present study suggest that the couple relationship in the information society becomes more important, and there is a tend to increase acceptability to increase. In contrast, there is stiff another discrimination in cyber-space by focusing on traditional mother route.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2005년도 춘계 학술대회논문집
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• pp.228-233
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• 2005

Two-dimensional Stokes flows through a micro channel with a couple of symmetric vertical fins are investigated. At far up- and down-stream from the fins, the plane Poiseuille flow exists in the channel. The slip boundary conditions are applied to take account of the Knudsen number effects. For the analysis, the method of eigen function expansion and collocation method are employed. By the results, the streamline patterns and pressure distributions are shown and the force exerted on the fin and the excess pressure drop due to the fins are determined as functions of the length of the fin and Knudsen number. It may be conjectured that the force and the excess pressure drop are almost independent of the Knudsen number.

• Journal of Mechanical Science and Technology
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• 제18권3호
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• pp.491-498
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• 2004

An analysis of the plane Couette flow between two parallel plates of a viscous, incompressible, micropolar fluid is presented. Especially, the effects of non-zero values of the micro-gyration boundary condition coefficient and pressure gradient on the flow fields are studied. Numerical results show that the micro polar parameter was found to have much more of an impact on the flow behaviors. It is also observed that the micro-gyration boundary condition coefficient influenced on the coefficients of skin friction and couple stress due to its different effect on the surface stress.

• Journal of Electrical Engineering and Technology
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• 제5권3호
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• pp.423-430
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• 2010

Particle swarm optimization (PSO) algorithm is designed to find a single global optimal point. However, the PSO needs to be modified in order to find multiple optimal points of a multimodal function. These modifications usually divide a swarm of particles into multiple subswarms; in turn, these subswarms try to find their own optimal point, resulting in multiple optimal points. In this work, we present a new PSO algorithm, called coupling PSO to find multiple optimal points of a multimodal function based on coupling particles. In the coupling PSO, each main particle may generate a new particle to form a couple, after which the couple searches its own optimal point using non-stop-moving PSO algorithm. We tested the suggested algorithm and other ones, such as clustering PSO and niche PSO, over three analytic functions. The coupling PSO algorithm was also applied to solve a significant benchmark problem, the TEAM workshop problem 22.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1996년도 춘계학술대회논문집
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• pp.145-155
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• 1996

The extrusion velocity of billet through a die and the shapes of the die are the important factors in the metal forming process of the extrusion of billet. in recent years, the life cycle of products is goingfaster. Although the former finite element method was capable of yielding a detailed analysis, it requires lots of time and extensive coding effort. Then, some simple devices were developed and based on upper bound method. For this purpose , a kinematically admiasible velocity field is formulated for extrusion of cylinders with arbitrary cross section and die profile on their outer surfaces by using a modified upper bound approach, which configures simulataneous extruding speeds in three directions . Also, In order to display mesh of the cold forward extrusion process using the approach , the automatic three-dimentional mesh generation produced by the approach coupled finite element method with upper bound method.

• 한국소음진동공학회논문집
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• 제16권1호
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• pp.89-100
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• 2006

This paper presents an analytical approach to describe the variation in the vibration characteristics such as the natural frequency of a piezoelectric transducer under static pre-pressure. The transducer considered in this paper is a bolt-clamped Langevin-type transducer, which consists of a couple of piezoelectric discs, a couple of metal blocks for added mass effect, and a bolt to tighten them. A new analysis model for the transducer has been developed by taking into account the contact area between the piezoelectric ceramic disc and the metal block. The variation of the resonance frequency due to the pre-pressure has been calculated and compared with measured results reported earlier.

• Advances in nano research
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• 제8권4호
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• pp.283-292
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• 2020

In the present research, differential quadrature (DQ) method has been utilized for investigating free vibrations of porous functionally graded (FG) micro/nano beams in thermal environments. The exact location of neutral axis in FG material has been assumed where the material properties are described via porosity-dependent power-law functions. A scale factor related to couple stresses has been employed for describing size effect. The formulation of scale-dependent beam has been presented based upon a refined beam theory needless of shear correction factors. The governing equations and the associated boundary conditions have been established via Hamilton's rule and then they are solved implementing DQ method. Several graphs are provided which emphasis on the role of porosity dispersion type, porosity volume, temperature variation, scale factor and FG material index on free vibrational behavior of small scale beams.

• 대한가정학회지
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• 제20권1호
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• pp.97-110
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• 1982

The study was designed to compare family problems specially divorce between Korea and Japan. The age, married period, occupation, education and divorced reason of the couple are formed to be the major factor to relate to divorce in Korea and Japan. Divorced couple both in Kora and Japan showed similla tendency in age, married period and occupation; couples with younger age, 5∼10 years of married period, and sale and service occupation showed higher tendency in divorce. However Japan established the civil law 25 years earlier than Korea and always showed higher tendency in divorce rate between the year of 1912 and 1976. In Korea couples with middle and high school lower tendency in divorce. The major reason for divorce in Japan formed to be disagreed with personality and spouse's affair, but in Korea unchaste act was the most significant reason.

• 대한가정학회지
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• 제36권10호
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• pp.1-22
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• 1998

The purpose of this study was to analyze the state of the living arrangement plan, the housing plan, and economic plan for elderly's life and contributing factors to their life plan. The sample in this study consisted of 713 middle-aged and aged couple living in Korea. Statistics employed for the analysis were frequencies, means, x2 test, logit analysis and multiple regression. The results could be summarized as follows. The middle-aged and aged couple were planning to live independently in their elderly life. The husband's age, religion, living area, total income, total asset, home owenership had significant effects on the living arrangement of the middle-aged and aged. They had a plan to live in single detached house in their elderly life. And husband's age, educational attaintment, job, and living region were affecting the housing type in their elder life. The middle-aged and aged people had a economic plan that they estimated 970,000 won as living cost in their elderly life. And the factors affecting living costs were husband's educational attaintment, job, and total asset.