• Korean Journal of Animal Reproduction
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• v.13 no.2
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• pp.98-104
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• 1989

Successful techniques of in vitro fertilization(IVF) are valuable for studying the process of fertilization and for developing economical procedures for gene and nuclear transfer in farm animals. To date, bovine IVF system has been developed with oocytes in vitro or vitro, but the resulting zygotes exhibit limited embryonic development after in vitro culture. Even though in vitro matured oocytes achieved high fertilization and cleavage rates, these embryos appear extremly low rate of pregnancies when transferred to synchronized recipients. Development of early bovine embryos in vitro is generally arrested at the 8-to 16-cell stage. However, recent use of somatic cells such as trophoblastic vesicle, granulosa and oviduct epithelial cell for co-culture with early bovine embryos has proven effective for development of embryos, matured and fertilized in vitro, past the in vitro cell blocks. These factors clearly indicate the value of the co-culture system in promoting development of bovine oocytes matured and fertilized in vitro to morula or blastocyst stage in vitro. In addition, co-culture system may beome a tool for evaluation of viability of ova that have been manipulated by procedures such as splitting, microinjection and nuclear transfer.

• Journal of the Korea Institute of Building Construction
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• v.12 no.3
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• pp.266-274
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• 2012

The annual expenditure on diesel oil and heavy oil in the construction sector is the second largest among all industrial sectors. To meet the government's greenhouse gas reduction targets, the construction sector has until 2020 to cut its emissions by 7.1%. Unlike other high-tech industrial sectors, the construction sector has a fairly limited scope for technological improvements, which hampers its capacity to achieve the reduction target. To reduce emissions, it is necessary to establish an energy and emissions strategy at the project planning stage, and energy use and the resulting emissions must be estimated. This research aims to establish an estimation methodology for greenhouse gas emissions at the planning stage of construction projects. To estimate the project-related emissions, this research indentified the relationship among the types of emissions in a cross-sectional matrix form, and then provided a set of calculation methods for total project related emissions.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.34D no.2
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• pp.10-20
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• 1997

This paper describes the design, the manufacture and the development of th eautomatic gain control unit which ajdusts the gain of IF processor in the high sensitive & multifunctional receiver unit (HMR) for pulse doppler radar system. Accodording to the effective distnce of target, radar cross section, and a lot of external environments (such as clutter), the receiving stage of RADAR system often deviates from dynamic range. To solve this kind o fproblem, continuous/pulse wave AGC are realized, make it possible to control the gain characteristics of receiver stably, and can increase dynamic range linearly by adjusting the gain slope of receiver which is limited by 1-dB gain compression point. In this study, AGC unit is designed to regulate the total gain of receiver by using te analog feedback theory. It also has rapid enough response to process pulse signal. This study presents the gain control method of IF, the real manufacture technique (the package-type components) and the measurement performance of AGC.

• Asian Pacific Journal of Cancer Prevention
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• v.16 no.1
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• pp.31-34
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• 2015

While mammography has been used for diagnosis of breast cancer in Kazakhstan for a long period, published data are very limited. Recently stress has been placed on increasing the accuracy by double reading of mammograms. Here we provide an overview of breast cancer screening in the different regions of Kazakhstan with data on the stages of cancers detected. A total 459,816 women aged 50, 52, 54, 56, 58 and 60 years were screened in 2012 and 379,903 in the first 9 months of 2013. Clear differences in levels of detection were noted between urban and rural residents, the latter demonstrating lower rates for both screening and cancer detection. Women aged 50 were more likely to undergo screening than their counterparts aged 60. While there were no clear relationships evident between screening rates and stage or numbers of breast cancers observed, this might be due to a number of complicating factors like geographical variation in risk factors as well as ethnicity. Future analyses should focus on the efficacy of mammography in Kazakhstan to reduce mortality.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.6
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• pp.572-579
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• 1992

In this thesis, feedback circuit and FM detector applied to superheterodyne receiver to extract audio signal without random noise Is implemented. The feedback loop circuit converts 45MHz received signal to 4SiKHz If signal containing mess-age without random noise. Also the feedback loop provides the End local frequency, so narrowband BPF which is containing maximum Doppler frequency without message Is needed. Finally, quadrature FM detector extract audio signal by synthesis o350" shifted signal and ampli-tude limited signal. RSSI characteristics is measured and audio characteristics Is compared with existing If module.

• Proceedings of the KIEE Conference
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• 1990.07a
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• pp.521-524
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• 1990

There is an increasing interest in high-speed signal processing in modern telecommunication and consumer electronics applications. HDTV, ISDN. A limiting factor in Op-Amp based analog integrated circuits is the limited useful frequency range. This research program will develop a new CMOS Op-Amp architecture with improved gainband width product. The new design CMOS Op-Amp will achieve up to 100MHz unity gainband width with a 1.5-micron design rule.

• School Mathematics
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• v.2 no.2
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• pp.489-508
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• 2000

With the increased use of computational technology, many educators question about spending large amount of class time for dealing with computational algorithms in elementary school math classroom at the expense of more holistic aspects of mathematics such as number sense, spatial sense, problem solving and data management. This paper introduce the new method for learning addition and subtraction so called ‘Mrs. Weill’s Hill’, which is believed as a suitable remedial method for children with mathematical learning disabilities, with perceptual problems, or with limited working memory capacities. This method provides children with external memory strategies by allowing them to solve the addition and subtraction problems in a stage by stage fashion with as many steps as they require. It also gives the child greater flexibility in the solution process and thus helps reduce anxiety.

• Food Science and Biotechnology
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• v.16 no.6
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• pp.954-957
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• 2007

Gelation mechanism of xanthan-carob mixture (X/C) was investigated based on thermorheological behavior. Three X/C ratios (1:3, 1:1, and 3:1) were studied. Small amplitude oscillatory shear tests were performed to measure linear viscoelastic behavior during gelation. Temperature sweep ($-1^{\circ}C/min$) experiments were conducted. Using a non-isothermal kinetic model, activation energy (Ea) during gelation was calculated. At 1% total concentration, the Ea for xanthan fraction (${\phi}_x$)=0.25, 0.5, and 0.75 were 178, 159, and 123 kJ/mol, respectively. However, a discontinuity was observed in the activation energy plots. Based on this, two gelation mechanisms were presumed-association of xanthan and carob molecules and aggregation of polymer strands. The association process is the primary mechanism to form 3-D networks in the initial stage of gelation and the aggregation of polymer strands played a major role in the later stage.

• Journal of the Korean housing association
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• v.20 no.2
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• pp.19-26
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• 2009

The purpose of this study is to consider the importance of residential environment by grasping factors for residential environment, and also grasping the relationship between residential environment stress, residence coping style, and emotional intelligence. Self-report survey and emotional intelligence measuring tool developed by Wong & Law (2000) were conducted in this study to investigate the contents of residential environment stress, residence coping style, and emotional intelligence, and subjects of this study were students of D university. As a result of this study, residential environment stress that respondents recognized was not high, but stress in super ordinate stage of residential desire was higher than that in subordinate stage. Also as the result of conducting correlation analysis of the relationship between residential environment stress, residence coping style, and emotional intelligence, there was insignificant correlation. It is supposed that the result is caused by limited respondents in this study, and it is considered that more reliable analysis with expansive inspection will be required in the future study.

• International Journal of Contents
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• v.5 no.3
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• pp.57-64
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• 2009

Korea has relied on top down development method, in which companies, research and education institutions move into the industrial complexes established by the government. However, to improve local competitiveness, the paradigm is shifting from the government initiated industrial complex to the clusters based on the cooperative network of the region. Representative case is 'Samcheok-si Fire & Emergency industry cluster construction project' that begun in 2007. AHP technique analysis results on first-stage showed that priority was on policy and network elements, and the results of second-stage analysis show that priority was on Policy incentives to internationalize the cluster and strengthen link,. Cluster branding, Sharing of organizational culture to cope with changes in environment, Creation of group learning culture. The subject of this research is limited to Samcheok-si's the Fire and Emergency Industry cluster formation project. Therefore, the research area and standard should be expanded to increase generality in further researches.