• 아동학회지
• /
• 제27권3호
• /
• pp.169-187
• /
• 2006

A hierarchical linear model(HLM) provides advantages over existing traditional statistical methods (e.g., ordinary least squares regression, repeated measures analysis of variance, etc.) for analyzing multilevel/longitudinal data or diary methods. HLM can gauge a more precise estimation of lower-level effects within higher-level units, as well as describe each individual's growth trajectory across time with improved estimation. This article 1) provides scholars who study children and families with an overview of HLM (i.e., statistical assumptions, advantages/disadvantages, etc.), 2) provides an empirical study to illustrate the application of HLM, and 3) discusses the application of HLM to the study of children and families. In addition, this article provided useful information on available articles and websites to enhance the reader's understanding of HLM.

• 한국경영정보학회:학술대회논문집
• /
• 한국경영정보학회 2007년도 추계학술대회
• /
• pp.377-382
• /
• 2007

To transform the enterprise system into the 'Real Time Enterprise' with respect to IT, I suggest the conceptual application model which is composed of pieces(components) extracted from different packaged applications working in a heterogeneous environment based on the 'business activity' in other words, business services provided by internal (inter-enterprise) and external (extended enterprise) application to support a business activity within in an enterprise and the design mechanism focusing service tier which acts as intermediate tier within application architecture.

• 컴퓨터교육학회논문지
• /
• 제16권2호
• /
• pp.29-37
• /
• 2013

창의성이 강조되는 교육환경에서 사고의 범위를 넓힐 수 있는 그룹별 토론이나 창의성을 개발하기 위한 컴퓨터활용 수업 모형이 요구되고 있다. 따라서 본 논문에서는 그룹별 컴퓨터활용 교육에서 발생하는 문제점들을 사전 조사한 후 창의성을 고려한 웹 기반 수업 모형을 제안하였다. 수업 모형의 이론적 배경으로는 PBL을 기반으로 하였으며 웹 마인드 맵을 토론과 자료공유를 위한 도구로 활용하여 수업의 효율성과 함께 집단의 창의성도 함께 고려하였다. 제안한 수업 모형을 프레젠테이션 제작 과목을 신청한 학생들에게 적용한 결과 의사소통이나 자료공유, 역할분담, 기여도의 차이, 과다 시간 소요 등에 대한 불만이 줄어드는 확률적으로 유의미한 결과가 나타났다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제16권7호
• /
• pp.2286-2304
• /
• 2022

Blockchain is a distributed ledger that combines technologies such as cryptography, consensus mechanism, peer-to-peer transmission, and time stamping. The rapid development of blockchain has attracted attention from all walks of life, but storage scalability issues have hindered the application of blockchain. In this paper, a scalable blockchain storage model based on Distributed Hash Table (DHT) and the InterPlanetary File System (IPFS) was proposed. This paper introduces the current research status of the scalable blockchain storage model, as well as the basic principles of DHT and the InterPlanetary File System. The model construction and workflow are explained in detail. At the same time, the DHT network construction mechanism, block heat identification mechanism, new node initialization mechanism, and block data read and write mechanism in the model are described in detail. Experimental results show that this model can reduce the storage burden of nodes, and at the same time, the blockchain network can accommodate more local blocks under the same block height.

• 한국국방경영분석학회지
• /
• 제28권1호
• /
• pp.67-82
• /
• 2002

In this paper, we consider a rule of application of PRICE(Parametric Review of Information for Costing and Evaluation) model to the environment of Korean defense industry. The PRICE model which is a computer model to estimate the cost of an acquisition program, was developed for the regulation of defense acquisition program in the United States. Therefore, it is essential for us to figure out how we can adopt it under our defense acquisition regulations. We will give an alternative method to apply the PRICE model to the mapping problem between two regulations.

• 산업경영시스템학회지
• /
• 제15권25호
• /
• pp.53-62
• /
• 1992

Computer software users develop and utilize their application software by themselves since Processing methods are different by quantity and qualify of the information The developed model needs input data and error numbers generated during the testing phases. However. total error numbers of the existing model and each error time was needed as data for developing the new model. But, maximum likelihood estimation must be used to exponential model of binomial-type and estimating of parameters by using the searched data. Parameter estimation can be done with trial and error or simulation.

• 한국정보통신학회논문지
• /
• 제21권7호
• /
• pp.1386-1392
• /
• 2017

디지털 미디어의 활용이 활발하게 진행됨에 따라 UI/UX에 대한 관심 및 중요성이 증가하고 있다. 이에 교육용 모바일 앱 개발 시 가치분석 모형을 바탕으로 디자인 평가 모형을 설계하고 이를 바탕으로 한 개발방향을 제시하고자 한다. 소비자 가치 분석을 바탕으로 한 디자인 평가모형의 주요 요인들은 소비자의 지속적 사용에 영향을 미친다. 이에 앱 개발 시 기존 애자일 방식의 개발 단계에 사용자 가치 분석을 바탕으로 한 디자인 평가 주요 요인들을 반영하게 되면 최적의 UX환경을 제공할 수 있다. 이렇게 개발된 앱은 소비자에게 만족감을 높여주게 되어 지속적인 사용에 긍정적인 영향을 미칠 것으로 기대한다.

• 한국도서관정보학회지
• /
• 제39권4호
• /
• pp.237-260
• /
• 2008

이 연구는 RFID 시스템의 도서관 적용에 어떠한 요인들이 영향을 미치는 가를 살펴보았다. 이를 위해 유비쿼터스 핵심 기술인 RFID와 RFID 시스템의 도서관 적용에 관한 이론적 고찰을 통하여 정보기술수용모형 이론을 기반으로 인지된 유용성, 인지된 용이성, RFID 시스템의 도서관 적용 의도를 연구모형의 핵심으로 설정하고 사회적 영향, 인지된 위험, 직무 적합성, 지원, 자기 효능감 등을 주요 외부변수로 확장하여 이론적 연구모형을 개발하였다. 이 이론적 연구모형을 바탕으로 실증연구를 수행하여 RFID 시스템의 도서관 적용의 영향요인을 제시하였다.

• 지식경영연구
• /
• 제15권3호
• /
• pp.13-36
• /
• 2014

Recently, with the increasing popularity of smartphones, mobile applications have been being used in various sectors. In these environments, some mobile applications are being made for special purposes. The mobile campus application is one exemplary type of such special-purpose mobile applications, which have unique characteristics that allow only designated users, belonging to a specific group, to access and use relevant knowledge. The aim of this study is to identify and investigate critical success factors of mobile campus applications based on the DeLone & McLean's information systems (IS) success model and to find unique characteristics of mobile campus applications, compared to general-purpose mobile applications. In order to empirically test our research model, 199 samples were collected from students who actually had experience of using the mobile campus application of A university at least once. The findings of the structural equation modeling using SmartPLS 2.0 confirmed the DeLone & McLean's IS success model, with the exception for relationships between service quality and user satisfaction/intention to use. Moreover, the moderating role of sense of belonging to school on the relationships between quality-related factors (i.e., information, system, and service qualities) and success-related factors (i.e., user satisfaction and intention to use) was examined.

• Journal of Information Processing Systems
• /
• 제18권5호
• /
• pp.650-664
• /
• 2022

Mobile applications can be easily downloaded and installed via markets. However, malware and malicious applications containing unwanted advertisements exist in these application markets. Therefore, smartphone users install applications with reference to the application review to avoid such malicious applications. An application review typically comprises contents for evaluation; however, a false review with a specific purpose can be included. Such false reviews are known as fake reviews, and they can be generated using artificial intelligence (AI)-based text-generating models. Recently, AI-based text-generating models have been developed rapidly and demonstrate high-quality generated texts. Herein, we analyze the features of fake reviews generated from Generative Pre-Training-2 (GPT-2), an AI-based text-generating model and create a model to detect those fake reviews. First, we collect a real human-written application review from Kaggle. Subsequently, we identify features of the fake review using natural language processing and statistical analysis. Next, we generate fake review detection models using five types of machine-learning models trained using identified features. In terms of the performances of the fake review detection models, we achieved average F1-scores of 0.738, 0.723, and 0.730 for the fake review, real review, and overall classifications, respectively.