• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.10
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• pp.54-61
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• 2019

This paper reports a comparative review of the service quality attributes of Electronic Customs Clearance (UNI-PASS) by applying the Kano model, Timko's BW coefficients, and IGA model, as reported by Tontini et al. in terms of a service quality evaluation of electronic customs clearance as the comprehensive national customs administration information system. In addition, this study examined which quality attributes should be focused on to improve the service quality and enhance customer satisfaction using the electronic customs clearance service. The Kano, Timko, and IGA models were classified into the four common quality attributes: attractive quality, one-dimensional quality, must-be quality, and indifferent quality. Because the integrated approach was used, one-dimensional quality was included in the area for critical improvement, while the must-be quality was included in the area for intensive maintenance. In addition, the indifferent quality was included in the area of carefree, while the attractive quality was included in the area of competitive advantage.

• Journal of the Society of Naval Architects of Korea
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• v.30 no.3
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• pp.116-126
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• 1993

The finite element method(FEM) has been commonly used for structural dynamic analysis. However, the direct global application of FEM to large complex structures such as ships and offshore structures requires considerable computational efforts, and remarkably more in structural dynamic optimization problems. Adoption of the component-mode synthesis method is an efficient means to overcome the above difficulty. Among three classes of the component-mode synthesis method, the free-interface mode method is recognized to have the advantages of better computational efficiency and easier implementation of substructures' experimental results, but the disadvantage of lower accuracy in analytical results. In this paper, an advanced method to improve the accuracy in the application of the free-interface mode method for the vibration analysis of large complex structures is presented. In order to compensate the truncation effect of the higher modes of substructures in the synthesis process, both residual inertia and stiffness effects are taken into account and a frequency shifting technique is introduced in the formulation of the residual compliance of substructures. The introduction of the frequency shrift ins not only excludes cumbersome manipulation of singular matrices for semi-definite substructural systems but gives more accurate results around the specified shifting frequency. Numerical examples of typical structural models including a ship-like two dimensional finite element model show that the analysis results based on the presented method are well competitive in accuracy with those obtained by the direst global FEM analysis for the frequencies which are lower than the highest one employed in the synthesis with remarkably higher computational efficiency and that the presented method is more efficient and accurate than the fixed-interface mode method.

• Korean Journal of Ecology and Environment
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• v.54 no.4
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• pp.363-373
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• 2021

An ecological niche is defined as the specific role of a species influenced by time, space, and other resources. By investigating overlaps between ecological niches of different species, we could estimate the degrees of interspecific competition. Such studies often use geographic information systems (GIS) to discover niche overlaps between species. In this study, we used GIS to estimate the spatial niches of two Korean frog species(Pelophylax nigromaculatus and P. chosenicus). This enabled us to predict their geographic distributions in order to identify their coexistence regions and distribution patterns. The results confirmed that altitude was an important variable for predicting their distribution, with a correlation with their climatic range. Spatial distributions of the two frog species were highly overlapped, as the distribution range for P. nigromaculatus included most of the range of P. chosenicus, showing a sympatric distribution pattern. Within the coexisting regions, however, the presence sites for the two species did not overlap, implying weak competition. To confirm the principal factors influencing their competitive relationship and reasons for their sympatric distribution pattern, we need more detailed in-depth studies on the diverse environmental variables within the regions where the two species coexist. By doing so, we would be able to identify various mechanisms for avoiding competition in sympatric frog species.

• Korean Journal of Comparative Education
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• v.28 no.4
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• pp.107-135
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• 2018

This study examines the contents and characteristics of 'Double First Class University Plan', which is conceived by Chinese government in 2015, following the current 211, 985 projects to develop comprehensively a group of elite Chinese universities and individual university departments into world class universities and disciplines by the end of 2050. For this study, we used the literature analysis method and collected various policy documents, research papers, newspapers and books published in China regarding this plan. First, this study looks at the development process, performance and limitations of 211, 985 projects. Second, it defines the concept of the world class university mentioned in China, and looks at the objectives and highlights of the plan. Finally, this study summarizes the characteristics of 'Double First Class University Plan' and the results such as focusing on the university's tradition and characteristic, cultivation and attraction of human resources, intensive financial support, and the introduction of a competitive system. Based on the results, this study proposes several implications such as establishing and implementing long-term and comprehensive higher education policies, inducing local government participation and support, focusing on fostering talents and developing disciplines, and putting emphasis on Korean characteristics in developing world class universities.

• The Journal of the Korea Contents Association
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• v.19 no.6
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• pp.168-178
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• 2019

This study takes a close look at the recent success of independent documentaries to find its implications and a way to invigorate Korean documentary ecosystems. To this aim, this study performed in-depth interviews with independent documentary film makers and television documentary directors. Also, it analyzed the case of POV (Point Of View), which is television's longest-running showcase for independent documentary films in the USA. The results display that independent documentaries convey competitive edge of contents and expansion of distribution and funding through film industry systems, based on the producer systems, global distribution networks of overseas pitching and film festivals, marketing and audience strategy of film industry. Although this shows its molding of documentary industry ecosystems, there are great needs for various platforms other than film industrial outlet in order to make an advancement of the ecosystems under the digital environment. POV works on the basis of 'open sourcing' form when collaborating with independent film makers. Independent documentaries picked up by POV are aired on PBS, streamed via its online service, and distributed through community screenings; this three-outlet strategy makes POV a unique platform and has a relevance and feasibility to apply for Korean documentary ecosystems. Therefore, this study suggests to create a platform adopting POV system hoping that more studies and efforts would come for various and novel platform building so to make more advanced and invigorated ecosystems of Korean documentary.

• The Southeast Asian review
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• v.28 no.4
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• pp.197-221
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• 2018

The Cambodian People's Party swept all 125 assembly seats with 76.78% of the vote in 2018 general elections. The Cambodian National Rescue Party, having been dissolved by court, was excluded from the election and attempted to nullify the legitimacy of the election by demanding its supporters to boycott the election. The Cambodian People's Party launched a campaign encouraging to vote in a desperate need to thwart the boycott movement. The election then became an unprecedented kind of competition the winner of which is decided not by the percentage of the vote but by turnout. The Cambodian People's Party was the winner with the high turnout of 82.89%, securing the means to defend the legitimacy of the election. The potential supporters of the Cambodian National Rescue Party spread out with about a million voters switching to support the Cambodian People's Party. Over a half million invalid votes that unequivocally voiced opposition to the Cambodian People's Party were not sufficient to deny the legitimacy of the election. Having experienced the fierce competition in the 2013 general elections that threatened to end its rule, the Cambodian People's Party decided to secure its power in the upcoming election and executed a tactic designed to remove the rival party through legal means. Competition being removed, the Cambodian political system decayed back to hegemonic electoral authoritarianism from competitive electoral authoritarianism to which it had mad gradual progress through the general elections in the past.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.34 no.1
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• pp.1-7
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• 2021

This study investigated the structural, dielectric, ferroelectric, and strain properties of (0.98-x)Bi1/2Na1/2TiO3-0.02BiFeO3-xSrTiO3 (BNT-BF-100xST, x＝0.20, 0.22, 0.24, 0.26, and 0.28). All samples were successfully synthesized using the conventional solid-state reaction method and sintered at 1,175℃ for 2 h. The average grain size of the BNT-BF-100x ceramics decreased with increasing ST content. Furthermore, we observed that the ferroelectric- relaxor transition temperature (TF-R) decreased with increasing ST content, which eventually vanished in the BNT-BF-24ST ceramics. The results indicated that a ferroelectric to relaxor phase transition could be induced by ST modification. Consequently, a large electromechanical strain of 633 pm/V at 4 kV/mm was observed for the BNT-BF-26ST ceramics. These results imply that our materials have the competitive advantage of larger strain under lower operating field conditions compared with other BNT-based lead-free piezoelectric ceramics. We expect that BNT-BF-ST lead-free piezoelectric ceramics are promising candidates as a novel ternary BNT-based system and can find potential applications in actuators.

• Journal of the Korea Society of Computer and Information
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• v.27 no.11
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• pp.147-155
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• 2022

In this study, we developed a system to dynamically balance a daily stock portfolio and performed trading simulations using gradient boosting and genetic algorithms. We collected various stock market data from stocks listed on the KOSPI and KOSDAQ markets, including investor-specific transaction data. Subsequently, we indexed the data as a preprocessing step, and used feature engineering to modify and generate variables for training. First, we experimentally compared the performance of three popular gradient boosting algorithms in terms of accuracy, precision, recall, and F1-score, including XGBoost, LightGBM, and CatBoost. Based on the results, in a second experiment, we used a LightGBM model trained on the collected data along with genetic algorithms to predict and select stocks with a high daily probability of profit. We also conducted simulations of trading during the period of the testing data to analyze the performance of the proposed approach compared with the KOSPI and KOSDAQ indices in terms of the CAGR (Compound Annual Growth Rate), MDD (Maximum Draw Down), Sharpe ratio, and volatility. The results showed that the proposed strategies outperformed those employed by the Korean stock market in terms of all performance metrics. Moreover, our proposed LightGBM model with a genetic algorithm exhibited competitive performance in predicting stock price movements.

• Journal of Wetlands Research
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• v.25 no.2
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• pp.159-165
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• 2023

This study measured the ecological niche overlap between two deciduous oak species(Quercus acutissmia and Q. dentata) according to the change in growth responses after treating with the moisture and nutrient contents of the soil at four gradients, and interpreted the degree of competition between the two oak species by ordination method. In the moisture environment gradient, the ecological niche overlap of the two species was high in the photosynthesis-related leaf organs and low in plant architecture such as shoot length. In addition, in case of competition between two oaks, Q. dentata was remarkably dominant in soil moisture gradient, but Q. acutissimia slightly was slightly advantageous over Q. dentata in the soil nutrient gradient. These results show that even in a similar taxonomical group growing in a similar habitat, the response to the organ system of the plant varies depending on the type of environment factor, resulting in different competitive differences among plants.

• Journal of Korea Society of Industrial Information Systems
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• v.15 no.4
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• pp.83-101
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• 2010

Competition in Internet open-market has become fiercer as much for its growth possibility in differentiating from the general commercial market. For this reason, internet open-market entrepreneurs should make effective strategy in improving customers' e-loyalty to survive in the highly competitive internet open-market as in off-line market and to aim for growth through constant profit making. To satisfy with the goal, this study has been performed as the empirical research that confirms to the influence and relationship of e-service quality affected on the perceived value, customer satisfaction and e-loyalty. This is based on the result that e-service quality affected on e-loyalty for internet open-market. The research results are shown as follows; first, all factors including the perceived value and customer satisfaction, except possibility of system use, have the effect of e-service quality. Second, the perceived value between measurements affects significantly on customer satisfaction. And third, the perceive value and the customer satisfaction are a1so meaningfully influential to e-loyalty. The result presents important point that entrepreneurs in Internet open-market need to do their best to maintain in making profits for the future by improving the customers' e-loyalty and securing customers with high loyalty via continually revealing new influential factors on e-service quality, perceived value, and customer satisfaction.