• Education of Primary School Mathematics
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• v.16 no.1
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• pp.57-70
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• 2013

This study is aimed to compare the area of geometry of elementary mathematics textbooks in korea and china. Through this study, we would like to suggest some guidelines in order to develop geometric curriculum and textbooks in korea and to search for more efficient methods of learning mathematics. For this, we have looked through the general characteristics of geometry domain in mathematics curriculums and the textbooks in korea and china. Furthermore, we have found the similarities and differences while comparing specific contents in the two countries. The followings are the conclusions of this study. First, The mathematics curriculum in korea is divided into 'figure' domain, but the one in china is divided into 'space and figure' domain, which deals with figure and measurement. And china constructs the contents of the basic figure as a whole unit. Second, korea gives clear learning aims about contents whereas china gives learning activities. Lastly, when starting teaching a plain figure, korea focuses on checking and finding definitions and characters through fundamental figures. However, china focuses on figuring out components and the relations among them throughout various plain figure activities.

• Journal of Family Resource Management and Policy Review
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• v.27 no.1
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• pp.25-39
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• 2023

This study aims to analyze the differences in the strength of single-parent families based on family characteristics. Using a sample of 267 female single parents, we explore the factors that impact family strength. We found that several variables impact the strength of families headed by a female single parent: the length of time members had lived together as a single-parent family, co-residents, interactions with ex-spouses, full-time work, and household income. Based on these findings, we suggest that the length of time that single-parent families have lived together is an important criterion for planning and evaluating the family policies and services offered by healthy family support centers. Furthermore, in the context of family resource management, family policies and programs that address time management and family life planning for full-time single parents should be developed and implemented.

• Women's Studies Review
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• v.29 no.2
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• pp.139-173
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• 2012

This paper examines the delayed situations for gender equality in South Korean, Japanese, and Taiwanese families despite the challenge to the gender division of labor in modern society, and to analyze the contradiction between the notions of gender equality and the experiences women face in East Asia countries. Using EASS data, we analyze the effective difference over the division of household labor according to women's age and length of school time, attitude for gender division of labor, couple's labor time, and family network. In South Korea and Taiwan, men's actual ratio of household division is higher than Japanese men's. On the other hand, Japanese women's ratio of household division is the highest in spite of their progressive attitude for gender equality. It is due to the difference of women's working time among the countries. In South Korea and Taiwan, women tend to work in full time job, so that they seem to inevitably reduce the time for household labor. The family characteristics have an effect on the women's ratio of household division in Taiwan, and the feature of women's employment does in South Korea. The high percentage of three-generation household contributes to the reduction of housework burden in Taiwan. In South Korea, the higher women's education levels, the higher the women's ratio of household division. Women's weakened bargaining power for household labor is due to the relatively low level of high-educated women's economic participation in South Korea. This paper reveals the effective factors on the gender division of household labor. We propose the necessity of the macro-level analysis as well as the analysis of the personal and conjugal feature.

• Journal of The Korean Association For Science Education
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• v.28 no.2
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• pp.130-138
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• 2008

The purpose of this study was to analyze the effects of Science Writing Heuristic(SWH) strategy on problem-solving type inquiry modules through student-student verbal interactions. The modules were applied to 23 students of the 3rd grade in middle school and the SWH strategy was applied to 3 experimental groups. The SWH is the strategy that each student, first of all, has a chance to think and propose ways of problem-solving by individual writing a blue card when problems were emerged, and then students discuss ways of problem-solving with group members by writing a green card. Verbal interactions during small group discussions were audio- and video-taped, transcribed and analyzed to compare the effect of the SWH strategy. As a results, experimental groups tended to force solely on questions and suggestions about problem-solving, but controlled groups executed experiment and discussed about problem-solving simultaneously. The analysis also showed that the experimental students dialogued more on the deep-leveled argumental interactions than the controlled students did; in particular, show more SS3 and SD1 verbal interaction regarding suggestions of problem solving. We argue, therefore, that the SWH strategy is effective to the problem-solving type inquiry modules.

• Polymer(Korea)
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• v.30 no.1
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• pp.80-84
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• 2006

2-Biphenylyl acrylate(BPA) was synthesized by the reaction of acryloyl chloride with 2-phenylphenol (2PP). Hydrophilic copolymers with the moiety of the microbicide, 2PP, were prepared by the radical copolymerization of BPA and methacrylic acid (MA). From the compositions of the BPA unit and the MA unit in the copolymers, the monomer reactivity ratios were determined to be 0.86 for BPA and 1.21 for MA by means of Kelen-Tudos plot. This result indicates that the copolymers have a random structure. The amount of 2PP released through the hydrolysis of the copolymers was examined by UV spectrometry. The result showed that the release of 2PP increased with an increase in the hydrophilic MA content in the copolymers and with an increase in the pH of the release medium. Therefore, these results indicate that the hydrophilic polymers bearing 2-phenylphenol moiety can be controlled release microbicides.

• Journal of dental hygiene science
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• v.17 no.6
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• pp.463-471
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• 2017

The purpose of this study was to examine the causes of career interruptions among dental hygienists, institutional measures required for their long service and ways of creating a stable employment culture for them in determine how to resolve labor shortage, create stable jobs, and step up the reemployment of idle manpower. In addition, the following suggestions are made for the establishment of a stable employment culture for dental hygienists by analyzing related literature, research materials, and information such as forums for establishing appropriate jobs for female dental workers. First, a system should be set up to prevent career interruption among dental hygienists. The work environment should be improved to prevent career breaks, and the wages, working hours, and working style should be efficiently structured to maintain the tenure of employees. Second, a plan should be devised to make use of idle manpower, and a variety of necessary programs should be developed. With respect to regular working hours, the time conversion system should be used, which reduces the amount of time one would want to work while receiving a national subsidy. Third, dental hygienists working in different occupations for marriage, childbirth, childcare, school and personal hygiene should make a way to return to the dental system immediately when they want. Fourth, the government should take institutional measures and offer down-to-earth support and benefits for women consideration their social characteristics to guarantee a balance between work and childcare.

• Development and Reproduction
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• v.2 no.2
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• pp.197-203
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• 1998

DNA methylation seems to play an important regulatory role in gene expression and cell differentiation during postimplantation embryonic development. However, the significance of DNA methylation which is maintained by the DNA MTase during preimplantation embryonic development, is not fully understood. In order to study the role of DNA methylation in the preimplantation embryos, the expression of DNA MTase transcripts was monitored in the oocytes and preimplantation embryos. The mRNA of DNA MTase was detected in the oocytes and pleimplantation embryos. The relative mRNA levels of DNA MTase were high from the stages of GV-oocytes and pronuclear embryos, and thereafter decreased gradually. By the treatment of $\alpha$-amanitin, it was confirmed that the transcripts presented in pronuclear embryos was derived from the maternal genome. The presence of transcripts of DNA MTase in the oocytes and pronuclear embryos suggests that the maintenance of DNA methylation may be necessary and seems to play an important role in gene expression and cell differentiation during preimplantation embryonic develop-ment in mouse.

• Analytical Science and Technology
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• v.9 no.3
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• pp.292-301
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• 1996

The synthesis of poly(ether)tailed bipyridine complex as redox reaction probes has advanced attempts to interpret very slow diffusion and heterogeneous electron transfer. Diffusion coefficients as low as $1.5{\times}10^{-15}cm^2/s$ have been observed for the oxidation of neat $Co(bpy(ppgm)_2)_{3^-}(ClO_4)_2$ with $LiClO_4$ electrolyte. Heterogeneous electron transfer rate constants of materials were found to vary with diffusion coefficient. The decrease in k as the diffusion coefficient decreases was actually caused by the decreasing D. Diffusion coefficient for compound of strong ion pairing anion($ClO{_4}^-$) was much smaller than the diffusion coefficient for compound of weak ion pairing anion($CF_3COO^-$).

• Polymer(Korea)
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• v.24 no.2
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• pp.252-258
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• 2000

Various crosslinked poly(4-vinylpyridines) (CHP4VP) having different degrees of crosslinking were synthesized by radical copolymerization of 4-vinylpyridine with if N,N' -1, 6-hexamethylenebisacrylamide, and CHP4VP- Cu(II) complexes were prepared by the method of adsorption equilibrium. The catalytic activity of the complexes for the oxidation of ascorbic acid (AA) was investigated. The oxidation of AA by these complexes showed a kinetic behavior of the Michaelis-Menten type. The catalytic activity of CHP4VP-Cu(I ) catalytic system was increased with increasing the degree of crosslinking of CHP4VP, and its activity was scarcely decreased even after repeated use. However, the tendency of the catalytic activity of CHP4VP-Cu(II) complexes was decreased for the oxidation of AA when compared with that of the previously reported catalytic system containing crosslinked poly(4-vinylpyridine) prepared using N,N'-methylenebisacrylamide as a crosslinker. These results indicate that the degree of crosslinking of CHP4VP and the hydrophobicity of the crosslinker play an important role in the catalytic system of the oxidation of AA.

• Journal of Korean Society of Transportation
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• v.24 no.4 s.90
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• pp.67-79
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• 2006

The carriage of the Parcel by vail has declined sharply in recent decade due to the advent of parcel service by truck in the early 1990s. As a result, rail stations Providing the parcel services have decreased from 421 stations in the year 1973, to only 90 stations in 2005. From the financial perspective, the Parcel consignment expenses has surpassed the revenue, recording 5.2 billion Won of yearly deficit from the year 1999 to 2003. The shift in the train operators' affiliation from a governmental department to a government-funded organization arose due to the vail reform in January 1, 2005, and the train operators have sought to abolish the parcel services to minimize the deficit. In this research. we investigated the problems of rail parcel services, their competitiveness compared to the road parcel services, and their revitalization Possibilities. Finally. we have proposed plans for the abolishment of the rail parcel services, and assessed the possible outcome or this abolishment.