• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권3호
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• pp.1639-1658
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• 2019

Named entity recognition (NER) is an important technique for improving the performance of data mining and big data analytics. In previous studies, NER systems have been employed to identify named-entities using statistical methods based on prior information or linguistic features; however, such methods are limited in that they are unable to recognize unregistered or unlearned objects. In this paper, a method is proposed to extract objects, such as technologies, theories, or person names, by analyzing the collocation relationship between certain words that simultaneously appear around specific words in the abstracts of academic journals. The method is executed as follows. First, the data is preprocessed using data cleaning and sentence detection to separate the text into single sentences. Then, part-of-speech (POS) tagging is applied to the individual sentences. After this, the appearance and collocation information of the other POS tags is analyzed, excluding the entity candidates, such as nouns. Finally, an entity recognition model is created based on analyzing and classifying the information in the sentences.

• 경영정보학연구
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• 제18권3호
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• pp.73-96
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• 2016

최근 정보통신기술(Information and Communication Technology) 및 사물인터넷 시대가 도래함에 따라 융복합 환경에 따른 다양한 기술의 발전이 이루어지고 있다. 이에 따라 관련 학문에 대한 이론 및 활용 기술에 대한 관심이 고조되고 있는 상황이다. 이러한 패러다임의 변화는 학문들 간의 급격한 융복합 현상을 초래하였으며, 특히 정보시스템학(Information Systems)은 이러한 변화를 선도해 왔다. 정보시스템학은 다른 학문들과의 관계에 있어서 분화적(Divergence) 역할에서 나아가 융합적(Convergence) 역할까지 수행하고 있으나, 이러한 연구 동향에 관한 연구는 부족한 실정이다. 따라서, 본 연구에서는 시간 경과에 따른 정보시스템의 연구동향을 비교 분석하여 핵심 개념들을 살펴봄으로써 향후 정보시스템학 연구의 방향에 대한 시사점을 찾고자 한다. 구체적으로, 1980년부터 2015년까지의 경영 정보학의 상위 국제저널 48,102개의 논문제목, 저자, 초록, 키워드 분석을 통해 저자들의 공동 연구 네트워크 분석 및 연구 토픽 추출 결과를 연대별로 비교 분석하여 시각화하였다. 본 연구의 결과가 정보시스템 분야의 연구자들에게 정보시스템의 정체성에 대한 폭넓은 이해와 향후 연구 방향에 대한 새로운 시사점을 주기를 기대한다.

• 디지털산업정보학회논문지
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• 제6권4호
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• pp.251-265
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• 2010

Recently, with increasing interest in the subject of interfirm relationship mechanism, some information systems researchers point out that existing outsourcing theories are limited in explaining the choice of governance mechanisms in interfirm relational exchanges. Recognizing the importance of trust-commitment, this study focuses on the relationship of between control mechanism and commitment. Especially the role of trust as mediator is mainly researched. A mediation model was suggested on the basis of theoretical linkages from prior relevant studies. The research model was empirically tested with 73 IS outsourcing projects. The findings have significant impactions for further research and practice. Findings are as follows: First, outcome control, process control, social control had positive effects on trust and commitment. Second, inter-organizational trust played as a partial mediator on the relationship between control mechanisms and commitment. Based on these findings, the implication and the limitation of the study were presented including some directions for future studies.

• Korean Membrane Journal
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• 제7권1호
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• pp.1-18
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• 2005

The permeate flux decline due to membrane fouling can be addressed using a variety of theoretical stand-points. Judicious selection of an appropriate theory is a key toward successful prediction of the permeate flux. The essential criterion f3r such a decision appears to be a detailed characterization of the feed solution and membrane properties. Modem theories are capable of accurately predicting several properties of colloidal systems that are important in membrane separation processes from fundamental information pertaining to the particle size, charge, and solution ionic strength. Based on such information, it is relatively straight-forward to determine the properties of the concentrated colloidal dispersion in a polarized layer or the cake layer properties. Incorporation of such information in the framework of the standard theories of membrane filtration, namely, the convective diffusion equation coupled with an appropriate permeate transport model, can lead to reasonably accurate prediction of the permeate flux due to colloidal fouling. The schematic of the essential approach has been delineated in Figure 5. The modern approaches based on appropriate cell models appear to predict the permeate flux behavior in crossflow membrane filtration processes quite accurately without invoking novel theoretical descriptions of particle back transport mechanisms or depending on adjust-able parameters. Such agreements have been observed for a wide range of particle size ranging from small proteins like BSA (diameter ${\~}$6 nm) to latex suspensions (diameter ${\~}1\;{\mu}m$). There we, however, several areas that need further exploration. Some of these include: 1) A clear mechanistic description of the cake formation mechanisms that clearly identifies the disorder to order transition point in different colloidal systems. 2) Determining the structure of a cake layer based on the interparticle and hydrodynamic interactions instead of assuming a fixed geometrical structure on the basis of cell models. 3) Performing well controlled experiments where the cake deposition mechanism can be observed for small colloidal particles (< $1\;{\mu}m$). 4) A clear mechanistic description of the critical operating conditions (for instance, critical pressure) which can minimize the propensity of colloidal membrane fluting. 5) Developing theoretical approaches to account for polydisperse systems that can render the models capable of handing realistic feed solutions typically encountered in diverse applications of membrane filtration.

• Asia pacific journal of information systems
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• 제10권2호
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• pp.197-211
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• 2000

Despite the increasing pervasiveness of electronic commerce, very little empirical research has been done to examine its use in organizational contexts. Based on theories from the technological innovation literature, we developed an integrated model of electronic commerce initiation, adoption and implementation in Korea. We selected a random sample of 500 Korean leading companies. A questionnaire survey examined factors in initiation, adoption, and implementation of electronic commerce. Independent variables of this research were environment uncertainty, organizational characteristics(namely, organizational size, centralization, and formalization), and information system maturity. The resultant study sample included 62 firms across the industries. The empirical tests of the hypotheses were performed. According to our findings, environmental uncertainty, centralization, formalization, and information system maturity have a significant effect on the electronic commerce initiation, adoption and implementation.

• Asia pacific journal of information systems
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• 제12권2호
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• pp.25-44
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• 2002

The internet-based electronic commerce is considered as a new strategic alternative to boost competitiveness for small and medium-sized enterprises(SMEs). However, very little research about them has been reported. Meanwhile, the cyber shopping shops in Korea are growing rapidly in their numbers, scales, and diversity of business models. The primary purpose of this study is to investigate the factors influencing outsourcing decisions in the implementation of small and medium-sized cyber shopping shops. Based on the previous studies on IS outsourcing, marketing channel, and their related theories, three areas of determinants(IT & organizational, product, marketing channel characteristics) were identified. Responses of 125 cyber shopping shops from e-mail survey indicate that IT capability, technical specificity of shop implementation, degree of product customization, average amount of order, marketing capability are negatively associated with outsourcing of cyber shopping shop implementation. The results also indicate that the outsourcing decision on systems implementation and marketing channel selection(direct/indirect selling) is performed separately.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1794-1797
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• 2003

We developed a web-based virtual laboratory system for electronic circuit experiments on the client/ server distributed environment. Through our virtual laboratory, the learners will be capable of learning the concepts and theories related to electronic circuit experiments and how to operate the experimental equipments such as multimeters, function generators, digital oscilloscopes and DC power suppliers. The proposed virtual laboratory system is composed of four important components: Principle Classroom to explain the concepts and theories of electronic circuit operations, Virtual Experiment Classroom to provide interactive multimedia contents about the syllabus of off-line laboratory class, Assessment Classroom, and Management System. With the aid of the Management System every classroom is organically tied together collaborating to achieve maximum learning efficiency. We have obtained several affirmative effects such as high learning standard, reducing the total experimental hours and the damage rate for experimental equipments.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 추계학술대회
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• pp.547-552
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• 2007

This study compares the reasons why Small and Large companies are adopting electronic commerce(e-commerce) by these two groups of companies. Two surveys that were undertaken contemporaneously on the use of e-commerce by Small and Large companies in the Korea were used as the empirical basis for this study. Based on theories from the technological innovation literature, we developed an integrated model of e-commerce adoption in Korea. The research model hypothesized nine factors as significantly influencing e-commerce adoption in Small and Large companies: Customers, Suppliers, Partner Firms, Competitors, Relative Advantage, Cost, Compatibility, CEO's innovativeness, CEO's involvement.

• Asia pacific journal of information systems
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• 제15권3호
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• pp.91-109
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• 2005

According to traditional theories of information systems, one of the reasons for using information technology is that users believe it to be helpful or useful for what they want to do, which is called extrinsic motivation. However, in addition to extrinsic motivation, there are other reasons for using it such as enjoying or playing with information technology itself, called intrinsic motivation, and just others around users, called social influence. The objective of this study is to provide a research model for using information technology considering intrinsic and extrinsic motivation, and social influence. For validation of this model, we survey the users of 'Minihompy' since it is one of the most popular blog services in Korea and there are relatively clear extrinsic and intrinsic motivation, and social influence respectively in using it. By analysing 549 valid samples by Partial Least Square(PLS), we show the suggested research model to be a valid one. That is, all hypotheses we suggested turn out to be statistically significant and $R^2$ of the dependent variable, the intention of use, explaining by the model to be higher than 40%. In addition to validation of the research model, it is found that intrinsic motivation may be more important than extrinsic motivation and social influence in using information technology.

• 전자공학회논문지SC
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• 제49권2호
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• pp.17-25
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• 2012

본 논문에서는 입력에 시간지연이 있는 연속 비선형 시스템의 일반적인 이산화를 위해 높은 차수의 샘플링 보관법을 제안한다. 제안한 방법은 테일러 시리즈 확장, 샘플링 이론과 보관법의 조합을 기초로 한다. 새로운 이산화 방법의 수학적인 구조에 대해 세부적으로 유도하였으며, 제안한 이산화 방법에 대한 성능을 2차 시스템에 대한 시뮬레이션을 통해 검증하였다.