• Journal of the Korea Society of Computer and Information
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• v.4 no.4
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• pp.209-217
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• 1999

This study investigated a special class or Electronic Data Interchange(EDI) system. While it has been predicted that the use of EDI will have a significant impact on the competitive advantage of organization. very little is known about the successful construction of such system. A few studies done in this area have relied on anecdotal data on data based on a small number of case studies. The major objectives of the research are to identify the factors that facilitate the adoption and successful construction of an EDI system, and to evaluate the impact of the EDI system on competitive advantage of the organization. Based on the EDI literature. organizational performance is modeled to be affected by three independent variables: EDI system. communication. trust. The level of EDI system was used as control variable. The data used to test the model were collected in a mail survey from department store in Korea. The results indicate that organizational performance is affected by EDI system, communication. The paper concludes with a discussion of future directions for research in the area of test EDI models.

• Korean Journal of Radiology
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• v.24 no.2
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• pp.155-165
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• 2023

Objective: Little is known about the effects of using different expert-determined reference standards when evaluating the performance of deep learning-based automatic detection (DLAD) models and their added value to radiologists. We assessed the concordance of expert-determined standards with a clinical gold standard (herein, pathological confirmation) and the effects of different expert-determined reference standards on the estimates of radiologists' diagnostic performance to detect malignant pulmonary nodules on chest radiographs with and without the assistance of a DLAD model. Materials and Methods: This study included chest radiographs from 50 patients with pathologically proven lung cancer and 50 controls. Five expert-determined standards were constructed using the interpretations of 10 experts: individual judgment by the most experienced expert, majority vote, consensus judgments of two and three experts, and a latent class analysis (LCA) model. In separate reader tests, additional 10 radiologists independently interpreted the radiographs and then assisted with the DLAD model. Their diagnostic performance was estimated using the clinical gold standard and various expert-determined standards as the reference standard, and the results were compared using the t test with Bonferroni correction. Results: The LCA model (sensitivity, 72.6%; specificity, 100%) was most similar to the clinical gold standard. When expert-determined standards were used, the sensitivities of radiologists and DLAD model alone were overestimated, and their specificities were underestimated (all p-values < 0.05). DLAD assistance diminished the overestimation of sensitivity but exaggerated the underestimation of specificity (all p-values < 0.001). The DLAD model improved sensitivity and specificity to a greater extent when using the clinical gold standard than when using the expert-determined standards (all p-values < 0.001), except for sensitivity with the LCA model (p = 0.094). Conclusion: The LCA model was most similar to the clinical gold standard for malignant pulmonary nodule detection on chest radiographs. Expert-determined standards caused bias in measuring the diagnostic performance of the artificial intelligence model.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.10
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• pp.610-616
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• 2018

A variety of creative convergence education studies have been conducted around the world, but the study of creative convergence education based on problem-oriented learning is insignificant. STEAM education development research for engineering human resources also recognizes important factors like ethics awareness and consideration, cooperation, leadership, and communication skills. This study developed a model of interdisciplinary classes between marketing and commercial English classes as a way to effectively learn to cultivate the creative and fusion talents required by modern society. A model was developed for the process of convergence classes to be developed for evaluation after class by designing courses, selecting subjects, designing classes, drawing questions, and developing problems, as well as for discussion of pre-convergence courses, class performance, and class evaluation. The Mongolian university discussed in this paper plans to introduce a suitable educational environment by developing a problem for interdisciplinary classes in marketing and business English. Based on the need to nurture talent required by the rapidly changing knowledge-based society, Mongolian universities should continue the strategy of fostering creative convergence talent through the convergence of technology. This is because creativity is the most important thing in the current situation.

• ETRI Journal
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• v.38 no.1
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• pp.70-80
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• 2016

This paper addresses the problem of robust waveform design for distributed multiple-radar systems (DMRSs) based on low probability of intercept (LPI), where signal-to-interference-plus-noise ratio (SINR) and mutual information (MI) are utilized as the metrics for target detection and information extraction, respectively. Recognizing that a precise characterization of a target spectrum is impossible to capture in practice, we consider that a target spectrum lies in an uncertainty class bounded by known upper and lower bounds. Based on this model, robust waveform design approaches for the DMRS are developed based on LPI-SINR and LPI-MI criteria, where the total transmitting energy is minimized for a given system performance. Numerical results show the effectiveness of the proposed approaches.

• Research in Mathematical Education
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• v.25 no.4
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• pp.267-284
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• 2022

In response to the current educational situation of students' heavy workload, the author constructs the precision-targeted classroom based on Precision Teaching (PT), Network Pharmacology, and Treatment Based on Syndrome Differentiation. The precision-targeted classroom can solve the current problems of PT and the phenomenon of the heavy academic burden on students, achieve the reduction of the burden and increase the efficiency of education. The precision-targeted classroom includes five key points: targeted goals, childlike thinking, precise intervention, intelligent homework, and stereoscopic evaluation, and the implementation process of the precision-targeted classroom is built from three aspects: before, during and after class. In addition, the author applied it to the actual mathematics classroom to test its teaching effect, and the experimental results showed that: the precision-targeted classroom significantly improved students' academic performance and thinking level; considerably improved students' classroom learning status, and facilitated teaching personalization and realized homework quantity control and quality improvement.

• The KSFM Journal of Fluid Machinery
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• v.18 no.6
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• pp.12-18
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• 2015

Recently, the development trend of turbomachinery is high capacity and high efficiency. Most of turbomachinery in the market are adopting ball bearings or air foil bearings. However, ball bearings have a limit for high speed product over $2.0{\times}10^6DN$(product of the inner diameter of the bearing in mm (D) and the maximum speed in rpm (N)). Air foil bearings have a limit for high axial load for high power products over 200~300 HP(horse power). Magnetic bearing is one of the solutions to overcome the limits of high speed and high axial load. Because magnetic bearings have no friction between the rotor and the bearings, they can reduce the load of the motor and make it possible to increase the rotating speed up to $5.0{\times}10^6DN$. Moreover, they can have high axial load capacity, because the axial load capacity of magnetic bearing depends on the capacity of the designed electromagnet. In this study, the radial and thrust magnetic bearings are designed to be applied to the 200 HP class turbo blower, and their performance was evaluated by the experiment. Based on the tests up to 26,400 rpm and 21,000 rpm under the no-load and load condition, respectively, it was verified that the magnetic bearings are stably support the rotor of the turbo blower.

• Journal of Environmental Science International
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• v.12 no.4
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• pp.383-391
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• 2003

The purpose of this research explain the meaning of the environmental design principles and cultural landscape pattern(dualistic space organization) of the Hahoe(河回:winding river village) the Yangdong(良洞) traditional village. Village's space organizations based on Shamanism, fin-yang and Five elements principle, Feng-shui idea, social system and Confucian ideas. And it were accomplish curat landscape pattern(village:form+object=pattern) through the frame of settlement space. As a central persons of villages(the Hahoe $.$ the Yangdong) construction, Suhae(西厓) experienced tough Chunghyodang - Wonjichongsa - Ogyonchongsa - Pyongsansowon channel(忠孝堂 -遠志精舍 -玉端精含 -脣山書院) and Kyomam(謙 ) experienced tough Yangjindang - Binyeonchongsa - Kyomamchongsa - Hwachonsodang(養眞堂 - 賓淵精舍 - 謙庵f精舍 - 花川書堂) channel. Also Woojae(愚齋) experienced tough Suhbackdang - Khankachung - Dongkangsowon(書百堂 - 觀稼停 - 東江書院) and Hoejae(晦齋) experienced tough Moochumdang - Hyangdan - Oaksansowon(無添堂 - 香壇 - 玉山書院). It is space organization of themselves interact contrast and sequence principles with competition in good faith. And ecological art-space, that is, environmental spare organizations of traditional village has been reflected harmony between nature and artificiality, spatial rhythm and sequence, spatial hierarchy between upper classes and humble class, permeability space, asymmetrical balance, aesthetic space perception. The humble classes hold a ceremony Hahoe's Pyolsingut-Talnori(maskdance drama), Dangjae(堂祭:religious service) at the Dang(堂:shamanism spot) and Yangdong's Sohraesulnori, Hohminori. And the upper class hold a ceremony Hahoe's Julbulnori and Yangdong's Chungjanori connected with culture of confucianism. Specially, the cultural structure cf the village is evidence of a contrast between the upper class and the humble classes, time, method and location of ceremony(performance).

• The Journal of the Korea Contents Association
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• v.15 no.11
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• pp.616-625
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• 2015

The purpose of the study is to structure the friendship network by the social network analysis and investigate the effects of social network centrality and learners' performances in college students. Both the in-degree centrality of 1st grade class study-network(t=2.722, P<.005) and the in-degree centrality of and $2^{nd}$ grade class study-network(t=2.708, P<.005)are predicted the individual student's learning performances. But there is no correlation between the in-degree centrality of $1^{st}$ and $2^{nd}$ grade class entertainment-network and the individual student's learning performances. Results of the study suggested the significant effect of social network analysis measures on learners' performance in the friendship networks. Based on the results, implication to the teaching strategy and future research direction were discussed.

• The Research Journal of the Costume Culture
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• v.30 no.2
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• pp.281-296
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• 2022

This study is designed to compensate for the lack of children's clothing relics from the early 18th century and to reproduce young upper-class girls' costume as hanbokcontent. The shapes and materials of costumes are based on the record of 『Sukjong-silrok』 in 1701 and the characteristics of adult ladie's costume relics in this period, but reproduced as miniatures of these relics as like Joseon children's clothing of another period. The reproduced costumes are formal wear for 3~4 year-old girls, consisting of yeoui [女衣], long unlined skirts, and lined skirts. Sizes were set at a height ratio of approximately 155:95. Yeoui is sam-hoejang-jeogori using pine pollen-colored damask with a grape-squirrel pattern and a purple damask with flower-treasure pattern. The full length of yeoui is 24.5cm. It has a square-dangko outer collar with square inner collar. The long unlined skirt is a six-width overskirt that is 82cm long, made with lotus patterned sa. The lined skirt is a five-width skirt that is 61.3cm made with flower-treasure patterned red damask and ju. Several long pleats on both sides of these two skirts have been omitted. The result provides meaningful content for children's clothing in the early 18^th century and will be used as costume for an educational trial performance.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.10
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• pp.80-85
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• 2010

In this paper, a MIMO antenna is proposed for LTE/DCSl800/USPCSl900 handset applications. The proposed antenna is based on the IFA and its wide bandwidth is obtained by using a stagger tuning technique. To improve the isolation, a suspended line is connected to the shorting points in two antennas, and capacitors and inductors are added to the connected suspended line. Two identical antennas of which dimension is 2.8cc($40{\times}10{\times}7mm$) are mounted on the two end lines of the system ground plane($40{\times}60mm$). Analysis of the antenna performance and optimization is performed using CST Microwave Studio. The bandwidths are satisfied for LTE band class 13(746-787MHz), class 14(758-798MHz) and DCSl800/USPCSl900 band (1710-1990MHz). The isolations between two antennas are about -12dB for LTE band and -10dB for DCSl800/USPCSl900 band. And the radiation efficiency of each antenna is about for LTE band 33% and 45% for DCSl800/USPCSl900 band respectively.