• Korea Trade Review
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• v.43 no.1
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• pp.47-67
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• 2018

This study analyzed whether the poverty level among Asian countries has converged, by using data for the 'globalization period'. In particular, we analyzed the impact of trade on convergence by quantitative analysis using two indices; the head count ratio (H) and the human development index (HDI). The σ-convergence measurement and β-convergence measurement method, commonly used in the field of economic growth, are used for the analysis method. Results show that poverty rates have declined on average during the analysis period and there has been an increase in HDI. It seems that there has been improvement regarding poverty. However, this trend is only an indication of the average trend of Asian countries as a whole. As for the convergence between countries, which is the focus of this study, the HDI index shows the converges among countries while the H index does not show significant convergence among countries. It is also difficult to determine that trade has a statistically significant impact on the poverty rate convergence. However, in the case of HDI convergence, trade has contributed to increasing the convergence rates. This results might show that globalization does not guarantee the convergence among countries, and thus, we need to have additional policy in order to reduce the poverty.

• The Journal of the Korea Contents Association
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• v.13 no.2
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• pp.475-487
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• 2013

The aim of this study is to examine an existence of mutual interdependency in terms of military expenditure and arms imports between Northeast Asian countries such as South Korea, North Korea, China, Japan, and U.S. Recently, the mood of post cold war and intensified globalization lead to be disarmament in pursuing a policy on national defence in many countries. Since potential menace to national security has been receiving more concern rather than a direct armed clash, mutual interdependency on military spending should be fully understood. For a methodological tools, ${\beta}$ and ${\sigma}$-convergences, convergence with rational expectation, and Granger causality test are employed. Empirical evidence shows that the convergences which are evaluated by ${\beta}$, ${\sigma}$, and by a model based on rational expectation are in general revealed, and differences are more sensitive to a military decision making procedures. Granger causality, however, is not being existed. To this end, it would be concluded that the Northeast Asian countries are going with a trend in the world than forming their own tendency in this region.

• Communications of the Korean Mathematical Society
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• v.11 no.1
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• pp.57-62
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• 1996

For $1 < p \leq 2$ it is shown that a certain sequence of functions converges to -1 in $L^{p-\varepsilon}(0, 1)$ for any small $\varepsilon > 0$ if and only if the Riemann zeta function satisfies $\zeta(s) \neq 0$ for $\sigma = Re s > 1/p$.

• Journal of Digital Convergence
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• v.10 no.2
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• pp.225-229
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• 2012

A reformer for a small fuel cell system is an apparatus which converts hydrocarbon fuel into hydrogen-rich gas. Among many indices of a reformer, the most crucial index of a reformer is CO concentration in the off-gas out of reformer which must be controled under 5ppm for the efficiency and performance of a system. This paper suggests the criteria of a reformer operation for the stability of a reformer in a fuel cell system by deducing crucial indices and improving processes. The six-sigma technique was applied to verify the optimum control and operation of a reformer of a fuel cell combined heat and power system. The result of temperature control of each parts of a reformer system is the concentration of CO which is the most important factor for the operation of a fuel cell system. The temperature of the parts of a reformer, MTS, LTS and Prox, were controled so that the concentration of CO.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.8
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• pp.970-976
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• 2007

This paper presents a novel polar transmitter architecture with a 2-bit sigma-delta modulator. In the proposed architecture, the 2-bit sigma-delta modulator is introduced to suppress quantization noise of conventional sigma-delta modulator. The power amplifier configuration is also modified in a binary form to accommodate the 2-bit digitized envelope signal. The Ptolemy simulation results of the proposed structure show that the spectral property is greatly improved in full transmit band of EDGE system. The fine quantization scheme of the 2-bit modulator lowers the noise level by 10dB without increasing the over-sampling ratio, which may be obtained if the over-sampling ratio increases twofold. Dynamic range is also enhanced up to 5dB owing to the new form of the power amplifier in the transmitter.

• Journal of Digital Convergence
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• v.8 no.2
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• pp.177-188
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• 2010

This paper is aimed to examine an empirical analysis of the differences among success factors that contribute to high performance of the organizations that adopted Six Sigma according to company size. Furthermore, the research focused on empirically analyzing whether these factors affect marketing performance or not, from the provider's point of view. For this purpose, a survey was conducted among conglomerates, and small and mid-sized companies which are located in the Gumi Industrial Complex that implemented Six Sigma. The following are facts that were found by empirically analyzing the results. Therefore, it is empirically proven that there are quality performance differences according to company size. marketing performance differences from the provider's point of view. the theoretical proposed model, identified the operational definitions and 9 hypotheses were established, there were executed the survey of 250 employees in companies implementing six sigma.

• Journal of the Institute of Convergence Signal Processing
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• v.2 no.1
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• pp.53-62
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• 2001

In this paper, the hybrid function by local scale control is proposed to detect the optimal edges from blurred images. In the case of image capturing, some blurring is occurred by the characteristics of the illumination and the reflected light. During processing the blurred image, it is difficult to detect perfect edges. This algorithm proposed a new hybrid function which is merged Gaussian function and the second derivative of Gaussian function. And it detects the optimal edges applying directional edge detection by Canny algorithm as the scale factor of $\sigma$ in the given local mask has been changed after convolving the hybrid function for input image. In the result, the performance is confirmed that this algorithm is better than Sobel, Robert and Canny edge detector by analyzing the some test images. And the results is obtained 0.2 ㏈ ~ 14 ㏈ of PSNR than those conventional method.

• Journal of Korea Multimedia Society
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• v.21 no.6
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• pp.685-697
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• 2018

(Most companies that perform BPR have not achieved satisfactory results or have not performed successful BPRs. There are many reasons for this, but the most important one has caused problems that do not accurately reflect the requirements of various stakeholders. In this paper, we will apply the BPR consulting methodology to a new value innovation requirements engineering process based on the Blue Ocean strategy, which is a way to create a new market without competition by customerizing potential customers by satisfying new customer expectations and needs. This paper uses a requirements engineering process that can generate customer value by applying the ERRC(Erasure Reduce Raise Create) analysis method, which is the core of the Blue Ocean Strategy Framework[1,2]. We will also apply the Six Sigma DFSS (Design For Six Sigma) methodology to improve quality and process through quantitative and systematic analysis. The proposed approach was presented to the BPR consulting to present a practical case, and the results of the empirical analysis of the system user to validate the results of BPR consulting.

• Journal of Digital Convergence
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• v.10 no.11
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• pp.467-475
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• 2012

This study aims to analyze chemotherapy medication safety management system and formulate efficient methods to solve problems in the medication safety practices through application of 6 sigma techniques. From the results of analysis conducted, targeting nurses, such 3 factors as process-related factor, nurse-related factor and environment-related factor were identified as problems of the chemotherapy medication safety management. Through analyzing the prior knowledge about chemotherapy mediation safety and level of performance of nurses, the educational performance to complement deficiencies were selected as the final improvement plan, and the improvement activities were completed through drawing out management plans that specify management methods and countermeasures in the event of problems.

• Journal of Power Electronics
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• v.12 no.5
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• pp.778-786
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• 2012

In this paper, a novel scheme for the condition monitoring of lithium polymer batteries is proposed, based on the sigma-point Kalman filter (SPKF) theory. For this, a runtime-based battery model is derived, from which the state-of-charge (SOC) and the capacity of the battery are accurately predicted. By considering the variation of the serial ohmic resistance ($R_o$) in this model, the estimation performance is improved. Furthermore, with the SPKF, the effects of the sensing noise and disturbance can be compensated and the estimation error due to linearization of the nonlinear battery model is decreased. The effectiveness of the proposed method is verified by Matlab/Simulink simulation and experimental results. The results have shown that in the range of a SOC that is higher than 40%, the estimation error is about 1.2% in the simulation and 1.5% in the experiment. In addition, the convergence time in the SPKF algorithm can be as fast as 300 s.