• Bulletin of the Korean Chemical Society
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• v.31 no.6
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• pp.1689-1694
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• 2010

Substituent chemical shifts were examined for the 2- and 3-thiophene derivatives of chalcone and compared to the thiophene series of derivatives with the phenyl series. The chemical shift values for the ${\alpha}$-carbons of the enones showed and inverse correlation with the Hammett $\sigma$ values, but the correlation coefficients were moderate (r = 0.836 - 0.878). On the other hand, the $\beta$-carbons showed a normal correlation with excellent correlation coefficients (r = 0.994). The absolute magnitude of the $\rho$ values for the $\alpha$-carbon are about half of those of the $\beta$-carbon. The observation may be the result of a through-space transition of the electronic effect of the substituents in addition to the through bond transition.

• Journal of the Korean Chemical Society
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• v.35 no.1
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• pp.16-23
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• 1991

Resins of polystyrene supported triethylenetetramine of linear and claw types have been prepared by the reaction of triethylenetetramine with chloromethylated polystyrene. The resin supported triethylenetetramines were principally characterized by infrared spectra. Kinetics of adsorption of transition metals on the resin have been investigated. This paper reports the results of the diffusion coefficients and entropies of activation. The rate determining step is a process of diffussion through the particle.

• Journal of Family Resource Management and Policy Review
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• v.5 no.2
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• pp.1-12
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• 2001

One of the fastest-growing job categories for women in both the developed and the developing nations of the world is that of self-employment. In 1990 women accounted for 29% of all self employed workers. In Korea, self-employed women including unpaid family workers accounted for 40.4% of all female workers. They are in economically low status and have heavy workload. So, this study examines the real state and problems of self-employed woman. For this purpose, the transition of the number of self-employed women is nationally compared. And the statistical data and time use data on them and role conflict due to paid work and household work are presented. In the future society, self-employment will be a good alternative to self-realization and career for women. So, for self-employed women, following education is needed according to stages of business and characteristics of managers; entrepreneurship, management, and balance of work and family.

• Journal of the Korean Magnetic Resonance Society
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• v.19 no.1
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• pp.29-35
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• 2015

The microscopic dynamics of $CsH_2PO_4$, with two distinct hydrogen bond lengths, are studied by static nuclear magnetic resonance (NMR) and magic angle spinning (MAS) NMR. The proton dynamics of the two crystallographically inequivalent hydrogen sites were discussed in terms of the $^1H$ NMR and $^1H$ MAS NMR spectra. Although the hydrogen bonds have two inequivalent sites, H(1) and H(2), distinct proton dynamics for the two sites were not found. Further, the $^{133}Cs$ spectrum is more or less continuous near $T_{C1}$ (=153 K). Finally, the phase transition mechanism of $T_{C1}$ in $CsH_2PO_4$ is related to the ordering of protons.

• Bulletin of the Korean Chemical Society
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• v.2 no.3
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• pp.79-82
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• 1981

A calculation method of the dipole moments for square planar and tetrahedral complexes by the valence bond method has been developed and an example calculation was carried out choosing the square planar and tetrahedral $[M(Ⅱ)N_2Se_2]$ type complexes. The calculated values of the dipole moments by the valence bond method are higher than those of the approximate orbital method. We found that we may predict the geometric structure of the transition metal complexes comparing the calculated values of the dipole moments with the experimental values. A new method for definition of C' parameter has also developed on the basis of extended Huckel theory.

• Health Policy and Management
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• v.14 no.1
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• pp.148-168
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• 2004

To investigate the effect of parents' social class on birthweight in Korea during the period of transition to a market economy, 1995-2001. Methods: All births resulting from pregnacies reported in 1995-22001(n=4,298,374) were studied with respect to social variation in birthweight. The results were adjusted for maternal age, parity, parents' education, gestational age, total births, the dead births among total births, the number of births in one delivery. Results: Between 1995 and 2001, mean birth weight was 3271g and low birth rate was 3.41%. Maternal education, faternal education, parents' occupation, the number of birth in one delivery, total births, gestational age, and the number of deaths among. total births were all independently related to the birthweight. Parents with lower education showed higher low-birthweight rates compared with parents with university level of education(OR: 2.16 for mother and 1.68 for father). Especially, mother's education showed stronger relationship with birthweight than fathers' education. The differences in birth weight by parents' social class, especially parents' educational level became stronger between 1995 and 2001. Discussion: This study suggests that the social differences of birth weight were increasing in order 1995 to 2001. Especially, this increasing tendency in variation in birth weight by social class was shown after economic crisis, 1998.

• Journal of the Korean School Mathematics Society
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• v.18 no.4
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• pp.471-486
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• 2015

Happiness education is not aim at rising in the world and gaining fame about goal of education but that it is a transition movement to mature educational direction to conduce to demonstrate the student's aptitude and potential. It is to search for a specific practices of happiness education in school mathematics curriculum is important at mathematics education. In this study, we surveyed about practices of happiness education of primary teachers and math teachers of the secondary schools. The practices of a reasonable and a practical happiness education which is conform to the scene of school was especially seek by the analysis of survey results.

• Bulletin of the Korean Chemical Society
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• v.35 no.2
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• pp.397-400
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• 2014

Size- and shape-controlled monodisperse wurtzite structured CdS nanorods have been successfully synthesized using a facile solution-based colloidal method. Depending on the control of injection/growth temperatures and the variation of Cd-to-S molar ratios, the morphology of the CdS nanocrystals (NCs) can be adjusted into bullet-like, rod-like, and dot-like shapes. X-ray diffraction (XRD), transition electron microscopy (TEM), and absorption spectroscopy were used to characterize the structure, morphology, and optical properties of as-synthesized CdS NCs. It was found that uniform CdS nanorods could be successfully synthesized when the injection and growth temperatures were very high (> $360^{\circ}C$). The aspect ratios of different shaped (bullet-like or rod-like) CdS NCs could be controlled by simply adjusting the molar ratios between Cd and S.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.701-705
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• 2002

This paper describes implementation of IPv6-IPv4 transition toolbox named as 6TALK(IPv6 TrAansLator of Krv6) and some scenarios using 6TALK which enables IPv6 island to connect other IPv6 island or IPv4 island seamlessly. 6TALK implements some transition mechanisms suggested in NGTrans Working Group of IETF. Those mechanisms are composed of basic mechanism, tunneling, and applied mechanism such as DSTM. 6TALK provides functions which enable IPv6 network at the edge of existing network to communicate with IPv4 network by using these transition mechanisms. As major transition mechanisms in 6TALK we adopt NAT-PT/SIIT and DSTM/DSTM options and as implementation environment we use Linux Kernel 2.4.18 and Netfilter framework. Software modules implemented in Linux kernel was ported to hardware box using Motorola MPC 8260 processor. The transition mechanisms used in 6TALK are the ones predicted to be used in initial transition step to IPv6.

• Journal of The Korean Association For Science Education
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• v.41 no.5
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• pp.429-440
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• 2021

In this article, we explored the value of interculturalism in developing the discourses of international cooperation in science education. By doing so, we interviewed four teachers who had an experience in teaching science in developing countries, and analyzed their experiences and perceptions in the lens of interculturalism and dialogue. Our analysis of teacher narratives shows the transition in the teachers' perspectives from volunteering and transmission to collaboration and learning. The transition from volunteering to collaboration occurred as the teachers learned how to meet 'the others' as themselves being strangers in the foreign context. Through intervening and colliding, teachers were able to reposition their identities as teachers. Furthermore, their science teaching practices show how the teachers tried to negotiate between the universal or idealistic value of science education and the heterogeneities formed by the country's cultural and specific situation of science education. Through these experiences, the teachers began to understand the importance of the culturally specific 'need' for science education. In conclusion, we proposed a discourse of science education collaboration based on interculturalism in terms of the diversity and complexity of science education practices in developing countries, teacher professionalism, culturally relevant pedagogy and sustainable policy.