• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.1
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• pp.79-89
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• 2023

The inventory of many materials requires a large storage space, and the longer the storage period, the higher the potential maintenance cost. When materials are stored on a construction site, there are also concerns about safety due to the reduction of room for movement and working. On the other hand, construction sites that do not store materials have insufficient inventory, making it difficult to respond to demands such as sudden design changes. Ordering materials is then subject to delays and extra costs. Although securing an appropriate amount of inventory is important, in many cases, material management on a construction site depends on the experience of the site manager, so a reasonable material inventory management plan that reflects the construction conditions of a site is required. This study proposes an economical material management method by reflecting variables such as the status of the preceding and following activities, site size, material delivery cost, timing of an order, and quantity of orders. To this end, we set the appropriate inventory amount while adjusting related activities in the activity network, using float time for each activity, the size of the yard, and the order quantity as the main variables, and applied a genetic algorithm to this process to suggest the optimal order timing and order quantity. The material delivery cost derived from the results is set as a fitness index and the efficiency of inventory management was verified through a case application.

• Korean Journal of Culture and Social Issue
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• v.17 no.2
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• pp.241-260
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• 2011

This study was to develop the fun perception scale measuring what conditions employees experience fun feeling in work and to examine the construct validity of it. For this, the pre-studies(open-ended questionnaire, in-depth interviews, literature survey, pre-survey) were conducted to develop the preliminary questions of fun scale. In main study, 250 employees(male: 125, female, 125) were responded to a questionnaire consisted of 40 questions of fun perception scale extracted by pre-studies. The results were as follow. First, through the item analysis, factor analysis and reliability analysis, 7 factors composed of 29 items were extracted: 'self-determination', 'extrinsic reward', 'goal achievement', 'pleasure in the process', 'contribution to the company', 'worthless', 'challenge'. Cronbach's alpha reliability coefficient of each factor was suitable. Secondly, EFA was conducted to test the construct validity of fun scale with AMOS 16.0. Several goodness of fit indexes were used to assess model fit: X2/df, TLI, CFI, RMSEA. The results were revealed that all the indexes were acceptable with no additional modification. Based on these findings, the theoretical and the practical implications of fun perception scale were discussed.

• Journal of the Korean School Mathematics Society
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• v.11 no.1
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• pp.31-54
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• 2008

The discovery method is known to be the most effective in improving students' mathematical thinking. Recently, the long-term slow thinking(LST) is suggested as a possible method to implement the discovery method into the real classroom. In this concept, we examined whether students can solve such a problem, as appears to be beyond their ability, by themselves(LST) or not. 10 middle school students of the ninth grade were selected for the study, who had no previous experience on the infinite concept of calculus of the high school course. They had tried to solve a problem about the calculus by their LST for three days. Two of students solved the problem by themselves and seven of students solved it with help of hints. This result shows that if students are given the opportunity of LST for rather difficult mathematical problem with appropriate guidance of a teacher, they might solve it by themselves. That is, LST could be a possible method for implementation of the discovery method.

• Korea and Global Affairs
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• v.1 no.2
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• pp.109-128
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• 2017

The purpose of this study is to consider the appearance of the global generation transnational identity and forming process, existence aspect, functional role, and on the actuating mechanism, and etc. The results about the transnational identity of Diaspora and diversity are as follows. First, as to the transnational identity, the emigrants had been being determined by the relation with the accreditation and how type had been deal with one's decision about the self-identify. Second, the individual experience of the emigrant, interaction, and unstable status political support etc. various factors were combined and the diversity of the Diaspora identity showed. Third, the identity concept had been performing the function in the more expanded meaning called the nation and nation through the continuous meaning expansion than the individual as the national ideology. Fourth, the transnational identity of Korean-Chinese was specialized into the nation identity, double identity, and 'the identity of the third' etc. Fifth, the transnational identity of the Nikkei-Brazilian appeared for Japanese identity, Brazilian identity, and Nikkeijin identity etc. in Japan. In conclusion, the Transnational identity of the Diaspora is reproducing the identity of the emigrant, it suggests through the differentiation in the settlement and exclusion.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.27 no.1
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• pp.27-57
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• 2016

This study was designed to derive and propose the qualities, qualifications, duties, etc. needed for policy information librarians who work in the policy-related special libraries. To do this, literature related to professional librarians was analyzed comprehensively with respect to qualifications, qualities, duties presented and needed in domestic and international jobs sites. The information derived through this process was developed into a questionnaire and a survey conducted targeting as subjects specialized librarians in related fields. The results indicated that the highest required LIS degree for both policy information librarian and for policy related fields is a Master's Degree. Additionally in investigating the importance of related career experience required for a policy information librarian, work related to policies reference services appeared to be the most important. On the issue of important qualities required of a policy information librarian, 'outstanding policies related data navigation capabilities' was the highest, followed by 'knowledge of information policy and knowledge of policy related resources', 'knowledge of the current trends of policies related fields', and 'smooth interpersonal skills.' The survey also indicated that with respect to the duties of the information librarian planning of policy information services had the highest score, followed by the providing of policies information services, and then collection management.

• Journal of the Korean Institute of Landscape Architecture
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• v.45 no.4
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• pp.71-80
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• 2017

Landscape design pursues a balance among different values in our society, but aesthetic value and ecological value in landscapes must bring complex relationships into harmony. Ecological aesthetics can be defined as a domain of study that manages the relationship between landscape ecology and landscape aesthetics to create aesthetically attractive and ecologically beneficial landscapes. Despite the importance of the research area, there has been limited empirical research addressing ecological aesthetics. This article aspires to connect and expand the conceptual framework to the research methodologies of ecological aesthetics. First, this study suggests a conceptual framework that examines the relationship between landscape and perceptual process in the context of ecological aesthetics. This framework stresses the importance of information and design intervention as moderators in this relationship. From this framework, three key topics in ecological aesthetics arise: (1) correlation between ecological integrity and aesthetic preference, (2) "compromised" design and management intervention principles that enhance aesthetic pleasure and still have biodiversity, and (3) the impact of information intervention in aesthetic experience. The framework indicated three domains affect each other; thus, when one domain is studied, the other two need to be considered. Secondly, several theoretical and empirical studies on ecological aesthetics will be reviewed from a methodological point of view. This will help to consider ecological aesthetics research, which has primarily been limited to theoretical discourse in empirical research.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.3 s.345
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• pp.59-67
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• 2006

OFDM (Orthogonal frequency Division Multiplexing) systems convert serial data stream to N parallel data streams and modulate them to N orthogonal subcarriers. Thus spectrum utilization efficiency of the OFDM systems are high and high-speed data transmission is possible. However, with the OFDM systems using the same modulation method at all subcarriers, the error probability is dominated by the subcarriers which experience deep fades. Therefore, in order to enhance the performance of the system adaptive modulation is required, with which the modulation methods of the subcarriers are determined according to the estimated SNRs. The IEEE 802.11a system selects various transmission speed between 6 and 54 Mbps according to the modulation mode. There are three typical methods for SNR estimation: Direct estimation method uses the frequency domain symbols to estimate SNR directly by minimizing MSE (Mean Square Error), EVM method utilizes the distance between the demodulated constellation points and received complex values, and the method utilizing the Viterbi algorithm uses the cumulative minimum distance in decoding process to estimate the SNR indirectly. Through comparison analyses of three methods we propose a new SNR estimation method, which employs both the EVM method and the Viterbi algorithm. Finally, we perform extensive computer simulations to confirm the performance improvement of the proposed adaptive OFDM systems on the basis of IEEE 802.11a.

• Journal of Software Engineering Society
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• v.27 no.1
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• pp.8-14
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• 2018

As cloud computing has emerged as a hot trend in the IT industry, various types of cloud services have emerged. In addition, cloud service broker (CSB) technology has emerged to alleviate the complexity of the process of selecting the desired service that user wants among the various cloud services. One of the key features of the CSB is to recommend the best cloud services to users. In general, CSB can use a method to evaluate a service by receiving feedback about a service from users in order to recommend a cloud service. However, since each user has different criteria for giving a rating, there is a problem that reliability of service evaluation can be low when the rating is only used. In this paper, a method is proposed to supplement evaluation of rating based service by applying machine learning based sentiment analysis to cloud service user's review. In addition, the CSB prototype is implemented based on proposed method. Further, the results of comparing the performance of various learning algorithms is proposed that can be used for sentiment analysis through experiments using actual cloud service review as learning data. The proposed service evaluation method complements the disadvantages of the existing rating-based service evaluation and can reflect the service quality in terms of user experience.

• Journal of Advanced Navigation Technology
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• v.23 no.6
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• pp.597-604
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• 2019

Artificial neural networks are algorithms that simulate learning through interaction and experience in neurons in the brain and that are a method that can be used to produce accurate results through learning that reflects the characteristics of data. In this study, a model using deep neural network was presented to improve the predicted wind speed values in the meteorological dynamic model. The wind speed prediction improvement model using the deep neural network presented in the study constructed a model to recalibrate the predicted values of the meteorological dynamics model and carried out the verification and testing process and Separate data confirm that the accuracy of the predictions can be increased. In order to improve the prediction of wind speed, an in-depth neural network was established using the predicted values of general weather data such as time, temperature, air pressure, humidity, atmospheric conditions, and wind speed. Some of the data in the entire data were divided into data for checking the adequacy of the model, and the separate accuracy was checked rather than being used for model building and learning to confirm the suitability of the methods presented in the study.

• Management & Information Systems Review
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• v.38 no.4
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• pp.41-60
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• 2019

The purpose of this study is to investigate the effect of salesperson's adaptive selling tactics on consumers who purchase Small and Medium Enterprises' product with the help of salespeople in the store. Specifically, we examine whether salesperson's adaptive selling tactics affect consumers hedonic shopping value and utilitarian shopping value. Furthermore, we try to figure out the effect of shopping value on the salesperson relationship commitment and consumer product satisfaction. The subjects of this study have surveyed the consumers with experience in purchasing SME's products through salespeople in the Gyeongnam area. As data process, SPSS 21.0 was used as the analysis tool and AMOS 21.0 was used to analyze the structural equation model. The implications of these findings are as follows. First, the salesperson's role has a positive effect on the consumer's product satisfaction. Second, it can be suggested that the salesperson's adaptive selling tactics are an important variable affecting the consumer's shopping value. Third, the results on the consumers who have hedonic shopping value have a strong positive influence rather than the consumers who have the utilitarian shopping value. The adaptive selling tactics of the salesperson should be encouraged to increase sales performance. In order to generate more performance in a competitive market environment, it is necessary to continuously strive to increase contact between the salesperson and the consumer in order to improve the quality of the relationship.