• The Korean Journal of Applied Statistics
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• v.35 no.4
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• pp.569-577
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• 2022

Simulation studies are often conducted when it is difficult to compare the performance of nonparametric estimators theoretically. Kim and Kim (2021) showed that more systematic and accurate comparisons can be made if you analyze the simulation results using a regression model,. This study is a complementary study on Kim and Kim (2021). In the variance-covariance matrix for the error term of the regression model, only heteroscedasticity was considered and covariance was ignored in the previous study. When covariance is considered together with the heteroscedasticity, the variance-covariance matrix becomes a block diagonal matrix. In this study, a method of estimating and using the block diagonal variance-covariance matrix for the analysis was presented. This allows you to find more pairs of estimators with significant performance differences while ensuring the nominal confidence level.

• Industry Promotion Research
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• v.7 no.1
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• pp.89-93
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• 2022

This study used a method of comparing and analyzing various editions of Jeokcheonsu, and aims to confirm why different views have arisen on commentaries that differ according to the perspective of one original text, which interpretation is more valid among them. It is not easy to grasp the theories of Myeongri because Jeokcheonsu is composed of the sentences of Si-bu with being well refined and having hidden meaning. Various perspectives makes the people more confused in reading commentaries. Lim Cheol-cho make additional annotations and try to subdivide the contents of Jeokcheonsu and classify them with quoting lots of 512 exemplifications in Ming Dynasty, and it is his great contribution to the Myeongri theory. The perspective that 'Eokbu Theory' is core contents of Myeongri theory in the first half of Jeokcheonsu is predominate. The sentence that 'Eokbu Theory' is mentioned for the first time is 'Cheayong, and we can quote 'Jeongsin', 'Soewang' and 'Junghwa' as a sentence paired together.'Eokbu Theory' of Jeokcheonsu is discussed continuously in the 'Gangyou' 'Junggwa' of Myeongri particulars which is connected in the middle of Jeokcheonsu.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.5 no.1
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• pp.59-67
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• 1995

Blood lead assay by $D_2$ lamp background correction method of atomic absorption spectrophotometer(AAS) with wavelength of 283.3 nm is most popular in occupational health practice in Korea. On the other hand, $D_2$ lamp background correction method with wavelength of 217.0 nm is also often used in general chemical analysis for lead assay in general purpose. But both methods have some weakness of background correction which brought direct effect on the results of analysis. Recently blood lead assay with polarized Zeeman effect of AAS was introduced and is now preferred in many laboratory than $D_2$ correction method in blood lead analysis. But still AAS with $D_2$ lamp are widely used in the field of occupational health in Korea. This study compared blood lead assay data with $D_2$ correction methods(283.3 and 217.0 nm) and with that of polarized Zeeman effect correction method to evaluate the validity of 02 correction methods. The results obtained were as follows; 1. Taking the value of polarized Zeeman effect method as reference value of 1.00, the mean relative value of $D_2$ correction method with wavelength of 217.0 nm was 0.92 and that with wavelength of 283.3 nm was 0.90 respectively in the analysis of blood lead whose value were below $20.0{\mu}g/dl$(p<0.001). Both mean values were statistically smaller than polarized Zeeman effect correction method. But in the analysis of blood whose value were between 20.0 to $20.0{\mu}g/dl$, the mean relative value of $D_2$ correction method was 0.96 in both wavelength and did not differ from polarized Zeeman effect method(p<0.001). There was no difference of blood lead between $D_2$ correction method and polarized Zeeman effect method in the analysis of blood lead whose value were over $40.0{\mu}g/dl$. 2. The variations of background correction value in polarized Zeeman effect method were not changed by increase of blood lead, but those in $D_2$ correction methods were increased by the increase of blood lead. While then relative standard deviation(RSD) of data measured by Zeeman effect method were decreased by the increase of blood lead, those by $D_2$ methods were nol differed by the increase of blood lead.

• Archives of design research
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• v.18 no.3 s.61
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• pp.15-24
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• 2005

There is a large waste of time, money, and production through the infelicitous product design process in small and medium enterprises. They don't possess enough career-manpower with respect to design. Especially, the objective and scientific approach process isn't presented very well on the 'establishment concept' of the embodiment phase or 'Sketch and Rendering' of the development phase which are the most important design processes. So, this research is applied to the conception of the AHP method. It uses the basic concept of relativity to decrease risk from the calculational quantity data, and supplement the decision making phase. Generally, human beings can conclude by relative judgement which is more influenceable than absolute judgement. So we must use the relative comparison concept rather than the comparison of two items with variable sketches based on characteristics of human beings. Thus, efficiency judgement is dependent on design sketch comparisons which help the consistency progress of variable alternative plans. We can decrease risk when we chose the final design and increase efficiency of the design decision making. That is now a perfect selection of each alternative's ranking and sensitive design result but this research will provide consistency criterion on filtering and lead to variable design alternatives. The significance of this research is the efficiency method that overcomes differences of character and sensitivity on many phases of the process. Finally, this research proposes a new ideal process that where applied improves quality and evidence of propriety through comparison to existing methods result in method application research for improvement quality.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.357-369
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• 2018

This study was conducted to provide data pertaining to precocious puberty by comparing the psycho-social behavior of girls with precocious puberty to those with normal development. This study was conducted from 1 June 2016 to 25 February 2017. The subjects were 104 female patients of A group with precocious puberty visiting H Oriental medicine clinic and S clinic in Seoul, and 104 girls in control group A and 104 girls in control group B attending elementary school in gun. The psycho-social behavioral characteristics of girls with precocious puberty and those with normal development were compared among 312 girls matched for gender and age using a t-test, ${\chi}^2test$, and ANOVA. In addition, the factors influencing precocious puberty were analyzed through multinomial logistic regression. The results revealed that the primary influence factors were frequency of meat intake (p<0.01) and eating-out (p<0.05). These were followed by watching TV (p<0.001), hours of using smart phone (p<0.01) and number of private institutes attended (p<0.05). Additionally, emotional and physical indexes were lower in the precocious puberty group than the control group, indicating that they have more pathology.Finally, girls in the precocious puberty group have lower family and friendship indexes than those in the control group, which means they have more pathology. Overall, the results indicate that extensive research on the causes and frequency of precocious puberty is necessary.

• Journal of Convergence for Information Technology
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• v.10 no.1
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• pp.149-157
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• 2020

This study aimed to explore the change of engineering students' competencies through the havruta class. In the havruta class, engineering students' competencies were compared with pre-test and post-test. The research tool was developed by selecting learning readiness, academic self-efficacy, and communication ability as the learner's competence in the havruta class. Finally, 105 data were analyzed with SPSS 21.0 for windows. First, there was a statistically significant difference in learning readiness. Second, there was no statistically significant difference in academic self-efficacy. Third, there was a statistically significant difference in communication ability. It was found that there was a positive change of competencies in learning readiness ability and communication ability in the havruta class. Although the findings are difficult to generalize to all majors, these results will be a useful basis for instructors who want to apply the havruta class.

• Journal of Life Science
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• v.18 no.11
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• pp.1479-1484
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• 2008

Deep seawater (DSW) refers to water extracted from the ocean, usually at depths of 200 meters or more, which is rich in inorganic materials and has attracted attention for various applications. We investigated the effects of the DSW on the synaptic maturation of cultured rat hippocampal neurons. Immunocytochemical examination of DIV21 showed that PSD-95, $\alpha$CaMKII, and synGAP$\alpha1$clusters were strengthened and coupling rates of SV2 and NR2B were significantly increased in neurons grown in the presence of H-800 and H-1000 DSW. Our results indicate that DSW promotes the formation of excitatory postsynaptic signal transduction complexes NRC/MASC and functional synapses.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.7
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• pp.36-46
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• 2017

The turbo code, an error correction code, needs a long decoding time since the same decoding process must be repeated several times in order to obtain a good BER performance. Thus, parallel processing may be used to reduce the decoding time, in which case there may be a memory contention that requires additional buffers. The QPP interleaving has been proposed to avoid such case, but there is still a possibility of memory contention when a decoder is constructed using the so-called double flow technique. In this paper, we propose an even-odd cross mapping technique to avoid memory conflicts even in decoding using the double-flow technique. This method uses the address generation characteristic of the QPP interleaving and can be used to implement the interleaving circuit between the decoding blocks and the LLR memory blocks. When the decoder implemented by applying the double flow and the proposed methods is compared with the decoder by the conventional MDF techniques, the decoding time is reduced by up to 32% with the total area increase by 8%.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.4
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• pp.126-137
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• 2020

This study provided implications for applying learner-centered teaching methods in the field of management education by adopting flipped learning and team-based learning to Business Communication classes and operating the classes according to its characteristics. Business communication capability, especially related to drawing up a document or a written report, is considered one of the crucial factors for making individuals valuable in an organization. For the identification of the subject outputs, a total of 64 students from the first and second semesters in 2018 were sampled, and the Wilcoxon signed rank test and paired t-tests were carried out. The results show that all types of communication capabilities have significantly increased at the end of each of the semesters. Also, the overall satisfaction level proved to be higher at the end rather than at the beginning of each semester. This study is especially meaningful because the results suggest concrete ways to apply learner-centered teaching methods for business education.

• Journal of the Korea Society of Computer and Information
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• v.13 no.7
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• pp.269-280
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• 2008

The choice of appropriate methodologies has always been a challenge. It is time to find obstacles when Extreme programming(XP) is adopted. In this paper, we invest status of adoption of XP methodology which is more popularized. We survey how the Values and the Practices of XP can be adopted to developer in terms of the usefulness and the easy of use of XP. As a result, it is regarded as a successful one in improving quality and timeliness through software development process. The Values and Practices, a basis of XP philosophy and its adoption, could be easily accomplished, but other elements - communication, feedback. collective ownership, pair programming, simple design and customer participation - which do not depend on technology could not be accomplished easily. To introduce XP easily in the creative and labor intensive software development fields, the managers and the educators have to make efforts to apply these Values and Practices based on humane characteristics as well as technical elements.