• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.11B no.2
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• pp.34-39
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• 2001

This paper described the forces analysis of a hybrid linear pulse motor (HLPM) with high accuracy and repeatability. The HLPM is fed from a phase current by microstepping drive. The finite element method (FEM) is employed for calculating the force. The forces between mover(forcer) and stator(platen) have been calculated using the virtual work method. The detent force, rate of tooth width to tooth pitch and magnetic saturation were analyzed to considered the distortion characteristics of static thrust. The thrust to displacement produced a high pulsating force while the normal force is much higher than the thrust force.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.3B no.3
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• pp.139-146
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• 2003

In this paper, the steady-state operating performance analysis for the three-phase squirrel cage rotor self-excited induction generator (SEIG) driven by a variable-speed prime mover (VSPM) in addition to a constant-speed prime mover (CSPM) is presented on the basis of an effective algorithm based on its frequency-domain equivalent circuit. The operating characteristics of the three-phase SEIG coupled by a VSPM and/or a CSPM are evaluated on line processing under the condition of the electrical passive load parameters variations with simple and efficient computation processing procedure in unregulated voltage control loop scheme. A three-phase SEIG prototype setup with a VSPM as well as a CSPM is implemented for the small-scale clean renewable and alternative energy utilizations. The experimental operating characteristic results are illustrated and give good agreements with the simulation ones.

• Journal of Information Technology Services
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• v.8 no.3
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• pp.135-143
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• 2009

The Outsourcing Industry has grown swift pace and evolved over time, and the Global IT Outsourcing market has shown signs of a steady growth. In the Korean company, however, IT Outsourcing is not active as that of the advanced countries and there is lack of literature to understand the characteristics of IT Outsourcing in the Korean company. This paper, therefore, analyze the outcomes surveying 65 companies in Korea to investigate how IT Outsourcing risk factors affects IT Outsourcing intention. Based on our literature reviews based on number of key articles, journals, and the focus group interviews, IT Outsourcing risk factors are proposed into four different domains: Transaction, Client, Vendor, Environment perspectives. It found that one factor(Vendor perspectives) is closely related to the IT Outsourcing intention of the Korean company. Finally, this paper analyzed the pros and cons of IT Outrcing offers a guide to the risk factors.

• Journal of the Korea Society of Computer and Information
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• v.24 no.2
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• pp.67-74
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• 2019

Since the announcement of bitcoin, new cryptocurrencies have been launched steadily and blockchain technology is also evolving with cryptocurrcies. In particular, security-related technologies such as consensus algorithm and hash algorithm have been improved and transaction processing speed has also been drastically improved to a level that can replace a centralized system. In addition, the advent of smart contract technology and the DApp platform also provides a means for cryptocurrency to decentralize social services beyond just payment. In this paper, we first describe the technologies for implementing cryptocurrency. And the major cryptocurrencies are described with a focus on the technical characteristics. In addition, the development of cryptocurrency technology is expanding the scope of use, so we tried to introduce various cryptocurrencies.

• Electronics and Telecommunications Trends
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• v.33 no.6
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• pp.139-153
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• 2018

The explosive interest in block chain, which was triggered by Bitcoin in 2009, is leading to substantial investment and the development of block chain technology. There is no dispute among experts that block chain will be the next generation of innovation. However, despite the high expectations for block chains, the related technology still has certain limitations. In addition to improving issues such as a low transaction throughput, inefficient agreement algorithms, and an inflexible governance structure, it is necessary to solve various problems for commercialization and full-scale spreading owing to the trilemma problem among the scalability, security, and decentralization. Under this situation, identification of the technology characteristics according to the generation is helpful for the development of the core technology requirements and commercialization blueprint in establishing an R&D direction. Therefore, in this article, the development of blockchain technology is divided into generations and analyzed in terms of the operational structure, consensus algorithm, governance, scalability, and security.

• Korea Trade Review
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• v.44 no.4
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• pp.101-114
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• 2019

E-business enables SMEs to reduce transaction costs and maintain export competitiveness in rapidly changing overseas markets. It is required to raise the entrepreneurial awareness of e-business of exporting SMEs. This study examines the characteristics of enterprises that play an important role in the introduction and utilization of e-business by domestic export SMEs. It explores the mechanisms that search and exploit these opportunities in an entrepreneurial way, and examines the process leading to export performance. We conducted a survey for empirical analysis and analyzed the data from 316 companies using e-business in Korea. As a result, both the international entrepreneurial orientation and the IT competence tended to be significant for the perception of e-business entrepreneurs and showed a different pattern in terms of size of influence. In addition, cooperation and operation among e-business entrepreneurs' perceptions have a direct impact on the export performance of SMEs.

• Korea Trade Review
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• v.44 no.6
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• pp.69-85
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• 2019

Logistics outsourcing businesses consist of the three main stages of bidding, contracting, and operations. This study focuses on the impacts of factors in the logistics outsourcing stages on outsourcing performance. Key factors in each stage may have direct influences on logistics partnerships and performance. Also, factors of each stage may impact the factors of subsequent stages. The relationships were examined using a structural equation model and verified by PLS (partial least square)-SEM methodology. Study results were as follows. First, the uncertainty of the shipper in the bidding phase affects the flexible contract in the contracting phase, and thus, affects the satisfaction of the logistics outsourcing services. Second, the uncertainty of the shipper in the bidding phase affects operations through contracts, and positively affects logistics outsourcing satisfaction through trust and cooperation.

• International Journal of Computer Science & Network Security
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• v.21 no.5
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• pp.237-242
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• 2021

The article deals with the problematic issues of defining information as an object of private relations. Definitions that they are intangible and non-consumable by nature, are inextricably linked to a specific material carrier are/or secured by the subject that transmits them, messages, and information that have quantitative and qualitative characteristics, and are capable of having a freight or another value, and in case of its illegal usage causing damage and moral harm.

• ETRI Journal
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• v.45 no.6
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• pp.982-995
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• 2023

Technological innovation generates products, services, and processes that can disrupt existing industries and lead to the emergence of new fields. Distributed ledger technology, or blockchain, offers novel transparency, security, and anonymity characteristics in transaction data that may disrupt existing industries. However, research attention has largely examined its application to finance. Less is known of any broader applications, particularly in Industry 4.0. This study investigates academic research publications on blockchain and predicts emerging industries using academia-industry dynamics. This study adopts latent Dirichlet allocation and dynamic topic models to analyze large text data with a high capacity for dimensionality reduction. Prior studies confirm that research contributes to technological innovation through spillover, including products, processes, and services. This study predicts emerging industries that will likely incorporate blockchain technology using insights from the knowledge structure of publications.

• Journal of Korea Port Economic Association
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• v.34 no.2
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• pp.51-68
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• 2018

This paper compares the differences in management performance in the logistics market and analyzes the differences in business characteristics depending on the industry types. In addition, the effects of industry types and business characteristics on management performance are examined. The analysis method used is ANOVA and K-means clustering. The implication of the study are as follows. First, in the logistics market in Japan, there was a difference in management performance among the types of industry. The warehousing service type had the highest profitability and stability among all the industry types. Second, differences in business characteristics by industry types were tested. It was found that offshore cargo transportation type was more capital intensive than the other types. In addition, warehousing service type had higher business leadership and credit transaction than others. Third, industry types and clusters based on business characteristics had a significant impact on management performance through interaction effects. For the profitability variables in detail, other clusters had a significant effect between transportation types(onshore and offshore cargo) and warehousing service type. On the other hand, in stability variables, one cluster was effective in all types, which is a characteristic that lowers both capital intensity and business leadership.