• Title/Summary/Keyword: PLS

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Analysis of internet addiction in Korean adolescents using sparse partial least-squares regression (희소 부분 최소 제곱법을 이용한 우리나라 청소년 인터넷 중독 자료 분석)

  • Han, Jeongseop;Park, Soobin;Lee, onghwan
    • The Korean Journal of Applied Statistics
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    • v.31 no.2
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    • pp.253-263
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    • 2018
  • Internet addiction in adolescents is an important social issue. In this study, sparse partial least-squares regression (SPLS) was applied to internet addiction data in Korean adolescent samples. The internet addiction score and various clinical and psychopathological features were collected and analyzed from self-reported questionnaires. We considered three PLS methods and compared the performance in terms of prediction and sparsity. We found that the SPLS method with the hierarchical likelihood penalty was the best; in addition, two aggression features, AQ and BSAS, are important to discriminate and explain latent features of the SPLS model.

Development and Application of Service Quality Model for Public System (공공제도 서비스품질 모델의 개발과 적용)

  • Lee, Jae Yul;Park, Geun-Wan;Hwang, Seung-June
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.40 no.1
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    • pp.150-164
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    • 2017
  • The development of an appropriate public service quality model has become increasingly recognised as an important subject of interest in the public sector as well as academia. In particular, the public systems enacted by governments are widely used and have a significant impact on national competitiveness. But few researches have been conducted to explore the quality dimensions of a public system service and empirically examine the relationship among related variables. Therefore, in this study, we strive to develop a quality measurement model of public system service that can be effectively used in practice. Using 601 samples gathered through a structured survey from project engineers, a conceptual quality model of public system is presented and discussed. Given the exploratory nature of this study, an exploratory factor analysis is used to investigate quality dimensions and partial least square (PLS) is employed in determining the structural relationships. From empirical results, we found that the quality dimensions of the public system had four distinct quality dimensions (design quality, environment quality, primary outcome quality, additive outcome quality). All four quality dimensions showed good representative factors in explaining user satisfaction. Perceived trust was proved to significantly mediate the relationship between quality dimensions and user satisfaction. Our research is expected to contribute to the literature by providing a good conceptual framework for assessing public system quality by linking four quality dimensions with user satisfaction. In particular, the developed model can elaborately measure process quality and multi-functional outcome quality of the system by the supplementation of design quality and additive outcome quality respectively. Practical implications are also suggested on the basis of our analysis.

A Compression Study on a Synthetic Talc (합성 활석에 대한 압축 연구)

  • Kim, Young-Ho;Kim, Soon-Oh
    • Journal of the Mineralogical Society of Korea
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    • v.27 no.4
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    • pp.283-291
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    • 2014
  • Talc ($Mg_3Si_4O_{10}(OH)_2$), one of sheet silicates, is soft and has been widely used in industry. Powdered talc specimen was synthesized at the pressure of 200 MPa and temperature of $600^{\circ}C$ using external heated hydrothermal high pressure apparatus. High pressure angular dispersive X-ray diffraction (ADXRD) mode experiments were performed at the Pohang Light Source (PLS) using the symmetrical diamond anvil cell (SDAC). Compression pressure was loaded up to 11.06 GPa at room temperature. This synthetic talc shows no phase transition(s) within the present pressure limit. Based on ADXRD data, bulk modulus of talc was calculated to be 72.4 GPa using Birch-Muranghan equation of state (EOS). This value is lower than that of natural talc determined previously.

Utilitarian Value and its Effect on Continuance Intention in Smartphone-based Mobile Commerce (스마트폰 기반 모바일상거래의 실용적가치와 지속이용의도)

  • Choi, Su-Jeong
    • The Journal of Information Systems
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    • v.25 no.3
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    • pp.31-60
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    • 2016
  • Purpose In 2016, the market size of mobile(m-) shopping goes beyeond more than half of a total of online shopping. People use smartphones as the main device for m-commerce. Under the circmustances, this study attempts to address why people prefer to use smartphone-based m-commerce. In other words, it is necessary to understand the main value that smartphone-based m-commerce creates. Drawing on the studies of consumption value, this study focuses on utilitarian value in predicting customers' continuance intention in the context of smartphone-based m-commerce, recognizing that utilitarian value is a key extrinsic motivation in the goal-oriented, performance-oriented shopping contexts. Furthermore, this study identifies factors affecting customers' utilitarian value from the perspective of benefits and costs, following the notion that it represents the result of evaluating a trade-off of benefits and costs caused by smartphone-based m commerce. More specifically, in this study, ubiquitous service, location-based service (LBS), transaction speed, and price utility belong to the benefit dimension, whereas technology anxiety and cognitive effort belong to the cost dimension. Design/methodology/approach To test the proposed hypotheses, the study conducted partial least squares (PLS) analysis with a total of 294 data collected on users with experience in smartphone-based m-commerce. Findings The results show that first, utilitarian value is increased by the benefits, such as ubiquitous service, transaction speed, and price utility. However, LBS has no direct effect on utilitarian value. Second, the noteworthy finding is that ubiquitous service and LBS greatly increase transaction speed. Third, technology anxiety and cognitive effort considered as the cost dimension are negatively associated with utilitarian value but their impacts on it are non-significant. Finally, the results support the argument that utilitarian value is a determinant of continuance intention. Overall, the findings imply that utilitarian value greatly depends on the peception on benefits rather than the aspect of cost in smartphone-based m-commerce. Overall, the findings offer new insight into the studies of m-commerce by considering and verifying the impacts of its benefits and costs simultaneously.

3D-QSAR Studies on Chemical Features of 3-(benzo[d]oxazol-2-yl)pyridine-2-amines in the External Region of c-Met Active Site

  • Lee, Joo Yun;Lee, Kwangho;Kim, Hyoung Rae;Chae, Chong Hak
    • Bulletin of the Korean Chemical Society
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    • v.34 no.12
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    • pp.3553-3558
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    • 2013
  • The three dimensional-quantitative structure activity relationship (3D-QSAR) studies on chemical features of pyridine-2-amines in the external region of c-Met active site (ER chemical features of pyridine-2-amines) were conducted by docking, comparative molecular field analysis (CoMFA), and topomer CoMFA methods. The CoMFA model obtained the partial least-squares (PLS) statistical results, cross-validated correlation coefficient ($q^2$) of 0.703, non cross-validated correlation coefficient ($r^2$) of 0.947 with standard error of estimate (SEE) of 0.23 and the topomer CoMFA obtained $q^2$ of 0.803, $r^2$ of 0.940, and SEE of 0.24. Further, the test set was applied to validate predictive abilities of models, where the predictive $r^2$ ($r{^2}_{pred}$) for CoMFA and topomer CoMFA models were 0.746 and 0.608, respectively. Each contribution of ER chemical features of pyridine-2-amines to the inhibitory potency showed correlation coefficients, $r^2$ of 0.670 and 0.913 for two core parts, 3-(benzo[d]oxazol-2-yl)pyridine-2-amine and 3-(1-(2,6-dichloro-3-fluorophenyl)ethoxy) pyridine-2-amine, respectively, with corresponding experimental $pIC_{50}$.

A Study on the Effects for IT Innovation, IT Dependency and Enterprise Architecture Usage on IT-Business Alignment (IT혁신, IT의존성 및 EA활용이 IT-비즈니스 연계(Alignment)에 미치는 영향 연구)

  • Jeon, Woong-Chan;Jeong, Seung-Ryul;Min, Dae-Hong
    • Management & Information Systems Review
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    • v.32 no.2
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    • pp.359-379
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    • 2013
  • The purpose of this paper is to identify and analyze the effects for IT Innovation, IT Dependency and Usage of Enterprise Architecture on IT-Business Alignment that have been on the mind C-level executives for several decades. In order to substantiate 5 hypothesis related 4 variables, 120 IT experts had been surveyed and Partial Least Square Method had been used to analyze the result. The results presented in this research indicates that technical review and feasibility study for IT Project should be performed considerably to align IT and Business requirement efficiently. It also implies that increased IT Dependency in working process results in the clearer specification of requirements for IT Project.

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The Effects of Technology Readiness Index of Artificial Intelligence and Internet of Things on the Recognition of Substitute Employment of Medical Personnel (인공지능, 사물인터넷의 기술준비도가 의료인력 고용대체인지도에 미치는 영향)

  • Kang, Han Seom;Kim, Young Hoon
    • Korea Journal of Hospital Management
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    • v.23 no.2
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    • pp.54-66
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    • 2018
  • Purpose: This study was to figure out relationships of perceived Technology Readiness Index(TRI), usefulness, acceptance intension, and the recognition of substitute employment of medical personnel on the artificial intelligence (AI) and internet of things (IoT) among main technologies. Methodology: To achieve the purpose, this study utilized structured survey tools to conduct a questionnaire survey of nursing, administrative and medical technology professionals at six university hospitals in Korea metropolitan area. A PLS(Partial Least Square) Path analysis was utilized To analyze the material. Findings: In the relation with the technology readiness and perceived usefulness, it had a positive influence to the perceived usefulness when the optimism and innovativeness were higher and the discomfort was lower. In the relation with the technology readiness and acceptance intension, it showed a positive influence when the innovativeness was higher and the discomfort was lower. In the relation with the perceived usefulness and acceptance intension, it had a positive influence to the acceptance intension when the perceived usefulness was higher. In the relation with the acceptance intension and the recognition of substitute employment, it showed a positive influence to the recognition of substitute employment when the acceptance intension was higher. Practical Implications: Judging based on the above study results and reference reviews, it confirmed that it is necessary to prepare in the level of hospital organization in the $4^{th}$ Industrial Revolution. They should increase the efficiency of human resources through the technological factors or changes of employment types for the additional demands of human resources to handle increasing medical demands or induce to secure necessary abilities which are changing at the right time by performing the $4^{th}$ Industrial Revolution related re-training continuously to develop the value of existing human resources.

Users' Experience of Sharing Economy Service and Moderating Effect of Social Interaction: Focused on Bicycle-Sharing Service (공유경제서비스의 이용경험과 사회적 상호작용의 조절효과: 자전거공유서비스를 중심으로)

  • Yoon, Ah-Young;Kim, Sung-Min;Koo, Chul-Mo
    • The Journal of Information Systems
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    • v.26 no.4
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    • pp.87-106
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    • 2017
  • Purpose The main purpose of this study is to examine whether the expectations and outcomes of the bicycle-sharing service significantly influence users' expectation disconfirmation, satisfaction, and continuous intention to use. In addition, we will verify the moderating effect of social interaction in bicycle-sharing service on the relationship between satisfaction and continuous intention to use. Design/methodology/approach Based on previous studies dealing with determinants of bicycle use, users' expectations and outcomes of the bicycle-sharing service were measured by three variables; accessibility, convenience, and safety. To collect the data, we conducted a survey of undergraduates at a university located in Seoul for three weeks, beginning March 6. Participants completed the first questionnaire, which measured expectations of the bicycle-sharing service based on the attributes and social interaction before using the BSS. After a few weeks, the same participants completed the second questionnaire, which measured outcomes of the outcome, disconfirmation, satisfaction, and continuous intention to use the BSS. Only participants who completed both surveys received monetary compensation. In order to test hypothesis, the Smart Partial Least Square (SmartPLS) modeling technique was applied. Findings In terms of main effects, based on the expectation disconfirmation theory, the results indicated that there were significant relationship among expectation, performance, disconfirmation, and satisfaction. In particular, it was verified that disconfirmation completely plays a mediating role between performance and satisfaction. In addition, the moderating effect of social interaction was examined. There was a significant interaction effects of social interaction and satisfaction on the continuous intention to use for leisure purpose. Finally, this study is expected to contribute to the study of resource sharing in the field of tourism and provide baseline information for future research.

The interrelationship between the functional characteristics and the intelligent personal assistant (지능형 개인비서(IPA)의 기능특성과 사용의도의 연관성)

  • Kim, Chan-Woo;Suh, Chang-Kyo
    • The Journal of Information Systems
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    • v.26 no.4
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    • pp.163-188
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    • 2017
  • Purpose The purpose of this study is to empirically analyze the factors affecting the intention to use the IPA focusing on functional characteristics. Based on the research result, this research has significance in that it not only suggested strategic guidelines for the related business operators, it also helped identify the factors that will influence the intention to use an intelligent personal assistant centering on the functional characteristics of the IPA. Design/methodology/approach Accordingly, in an attempt to identify factors that will influence the intention to use the intelligent personal assistant, we proposed a research model, together with a corresponding hypothesis, which incorporates the functional characteristics (personalization, anthropomorphism, autonomy, communication ability, contextual offer) and perceived enjoyment of the intelligent personal assistant into a technology acceptance model. To verify the research hypothesis of this research, we have conducted a questionnaire survey with individuals who have used an intelligent personal assistant as target. And with the data collected from 215 copies of the questionnaire survey, we have carried out a path analysis using the PLS structural equation. Findings As a result, it turned out that, of the IPA functional characteristics, personalization had a positive effect on perceived usefulness, autonomy had a positive effect on perceived usefulness and perceived ease of use. Also, communication ability had a positive effect on perceived ease of use and perceived enjoyment, and anthropomorphism and contextual offer had a positive effect on perceived ease of use and perceived enjoyment and turned out to be major factors that increased the use intention of intelligent personal assistant.

A Study on Teachers' perceptions and attitude toward students' piracy of digital contents (학생들의 디지털 콘텐츠 불법복제에 대한 교사들의 인식과 태도에 관한 연구)

  • Kim, Mi-Ryang;Kim, Deok-Jeong
    • The Journal of Korean Association of Computer Education
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    • v.15 no.3
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    • pp.49-59
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    • 2012
  • This study focuses on a comprehensive set of potential determinants of teachers' attitude and efforts for preventing students' piracy of digital contents. The proposed model is based on the theory of reasoned action, developed by Ajzen and Fishbein. The model was tested using responses from 177 teachers. Partial least square method was used to analyze the results. The hypothesized model was largely supported by this analysis, and the overall results indicate that intention for preventing students' piracy of digital contents is mostly influenced by the attitude and the social influence. The perceived level of recognition as well as the punishment for digital contents piracy has also been found to have some direct and indirect impact on the intention. But, on the contrary to our expectation, the teachers' efficacy has no influence on either the attitude or intention. As a conclusion, the academic and practical implications of these findings are discussed.

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