• The Journal of Advanced Prosthodontics
• /
• v.5 no.2
• /
• pp.118-125
• /
• 2013

PURPOSE. The purpose of this study was to evaluate the effect of the span length on the fit of zirconia framework fabricated using CAD/CAM system. MATERIALS AND METHODS. Abutments for single, 4-unit and 6-unit fixed partial prostheses were fabricated. Ten zirconia frameworks were fabricated for each group. The marginal and internal gap were presented by means of replica technique and measured by measuring microscope ($AXIO^{(R)}$, Carl Zeiss, Rochester, NY) and software (I-$solution^{(R)}$, IMT i-solution Inc., Vancouver, BC, Canada). The results were statistically analyzed by multivariate analysis test and Dunnett T3 test for post hoc test (${\alpha}$=.05). RESULTS. There were statistically significant differences at 2, 4, 7, 8 points (mesio-distal section) and b, d, e, f, g (labio-lingual section). In some marginal reference points of 6-unit group (P<.05), the marginal gap were larger than 120 ${\mu}m$. CONCLUSION. Span length of zirconia core may have an influence on marginal and internal fit. Within the limitation of this study, the increase of span length of zirconia framework of 6 or more-unit fixed partial denture may decrease the marginal and internal fit.

• Journal of Navigation and Port Research
• /
• v.44 no.1
• /
• pp.20-31
• /
• 2020

The purpose of this study was to provide planning criteria for the thalassotherapy facility. Among the various contents of the planning criteria, the crucial parts of the thalassotherapy facility planning are the location, facility environment, and room space. To do this, we first examined the characteristics of the thalassotherapy facility and inquired about the thalassotherapy resources and treatments that are the basis of the thalassotherapy facility planning. And then, the overseas qualification criteria related to thalassotherapy facility were analyzed. Based on the above research results, the criteria for the thalassotherapy facility planning on location, facility environment, and spaces of rooms are presented. The location is within 1km of the coastline, where there is no pollutant emission facility, and the climate conditions are maintained more than 80% throughout the year below 'caution' level of the thermal sensation index and sensory temperature. The water quality of the facility environment meets the stricter criteria among the domestic standards or ISO 17680 standards, and the air quality is 60% of the atmospheric environment standard of the 「Framework Act on Environmental Policy」 and SO₂, NO₂, O₃ and PM10 concentration shall ensure that the annual number of exceeding standards meets the EU standard, and noise is less than 50dB per daytime, 40dB per night. Therapy spaces have to meet the standards of the 「Building Act」, the working standards of architectural planning and international standards according to their function and use.

• ETRI Journal
• /
• v.32 no.2
• /
• pp.273-280
• /
• 2010

The overall channel capacity of a multihop wireless path drops progressively over each hop due to the cascading effect of noise and interference. Hence, without optimal rate adaptation, the video quality is expected to degrade significantly at any client located at a far-edge of an ad-hoc network. To overcome this limitation, decoding and forwarding (DF), which fully decodes codewords at each intermediate node, can be employed to provide the best video quality. However, complexity and memory usage for DF are significantly high. Consequently, we propose syndrome-based partial decoding (SPD). In the SPD framework an intermediate node partially decodes a codeword and relays the packet along with its syndromes if the packet is corrupted. We demonstrate the efficacy of the proposed scheme by simulations using actual 802.11b wireless traces. The trace-driven simulations show that the proposed SPD framework, which reduces the overall processing requirements of intermediate nodes, provides reasonably high goodput when compared to simple forwarding and less complexity and memory requirements when compared to DF.

• Asia pacific journal of information systems
• /
• v.26 no.3
• /
• pp.339-366
• /
• 2016

National and local governments around the world have been allowing access to administrative data to increase transparency, motivate civic engagement of citizens, and improve collaboration between the public and the government. This study reviews and classifies existing literature on open government data (OGD). To create a structure to organize the existing studies, the researchers devised a framework based on socio-technical theory and summarized the significance of studies along four major points: (1) readiness, (2) implementation, (3) emerging effects, and (4) actors of open data. Studies in OGD have been growing steadily in the recent years because of the rapid development of adoptable technologies that have enabled easier access to government data. Nonetheless, an examination of existing research not only shows a disparity in research and development of OGD across countries in the Open Government partnership program but also reveals pertinent issues that have arisen in different stages of the OGD initiative. The growing number of studies and expanding body of knowledge show the importance of organizing existing literature. This step is timely and significant to map out the current breadth and depth of OGD research. According to existing research, current open governments fall short in encouraging citizen participation and collaborations among citizens and the government. This study pointed out how studies on OGD actors might be the reason as well as the solution to existing findings. This paper aims to provide a framework for organizing OGD studies, present the status of OGD research, and provide recommendations on current gaps that must be addressed.

• Journal of Korea Multimedia Society
• /
• v.2 no.2
• /
• pp.217-229
• /
• 1999

Framework is the set of interrelated classes, constructing reusable design in specific domain or set of abstracted classes, and defines common architecture among applications included in domain. Developers can reuse not only class code but also wide range of knowledge on domain by reusing framework. In this papers, we present COM(Component-Oriented Methodology) for the reuse of framework, and develop construction environment for framework and domain development. That is, domain is analyzed by input of domain knowledge on real world to create software based on component, and hotspot is identified through analyzed information, and redesigned(refactoring) by putting additional information on users and developers. After that, I will create domain framework and application framework depending on domain. In this Component-oriented methodology, information is searched, understood and extracted or composite through component-pattern library storage internally. Then this information is classified into the information on component and pattern respectively, and used as additional information in redesigning. With this, developer can obtain reusability, easiness and portability by constructing infrastructure environment that allow to register, update and delete component through Component Pattern Management System(CPMS) under the development environment which can be easily applied to his own application using multimedia component, in this thesis, CORBA(Common Object Request Broker Architecture) environment.

• Journal of Intelligence and Information Systems
• /
• v.19 no.2
• /
• pp.125-140
• /
• 2013

We call a data set in which the number of records belonging to a certain class far outnumbers the number of records belonging to the other class, 'imbalanced data set'. Most of the classification techniques perform poorly on imbalanced data sets. When we evaluate the performance of a certain classification technique, we need to measure not only 'accuracy' but also 'sensitivity' and 'specificity'. In a customer churn prediction problem, 'retention' records account for the majority class, and 'churn' records account for the minority class. Sensitivity measures the proportion of actual retentions which are correctly identified as such. Specificity measures the proportion of churns which are correctly identified as such. The poor performance of the classification techniques on imbalanced data sets is due to the low value of specificity. Many previous researches on imbalanced data sets employed 'oversampling' technique where members of the minority class are sampled more than those of the majority class in order to make a relatively balanced data set. When a classification model is constructed using this oversampled balanced data set, specificity can be improved but sensitivity will be decreased. In this research, we developed a hybrid model of support vector machine (SVM), artificial neural network (ANN) and decision tree, that improves specificity while maintaining sensitivity. We named this hybrid model 'hybrid SVM model.' The process of construction and prediction of our hybrid SVM model is as follows. By oversampling from the original imbalanced data set, a balanced data set is prepared. SVM_I model and ANN_I model are constructed using the imbalanced data set, and SVM_B model is constructed using the balanced data set. SVM_I model is superior in sensitivity and SVM_B model is superior in specificity. For a record on which both SVM_I model and SVM_B model make the same prediction, that prediction becomes the final solution. If they make different prediction, the final solution is determined by the discrimination rules obtained by ANN and decision tree. For a record on which SVM_I model and SVM_B model make different predictions, a decision tree model is constructed using ANN_I output value as input and actual retention or churn as target. We obtained the following two discrimination rules: 'IF ANN_I output value <0.285, THEN Final Solution = Retention' and 'IF ANN_I output value ${\geq}0.285$, THEN Final Solution = Churn.' The threshold 0.285 is the value optimized for the data used in this research. The result we present in this research is the structure or framework of our hybrid SVM model, not a specific threshold value such as 0.285. Therefore, the threshold value in the above discrimination rules can be changed to any value depending on the data. In order to evaluate the performance of our hybrid SVM model, we used the 'churn data set' in UCI Machine Learning Repository, that consists of 85% retention customers and 15% churn customers. Accuracy of the hybrid SVM model is 91.08% that is better than that of SVM_I model or SVM_B model. The points worth noticing here are its sensitivity, 95.02%, and specificity, 69.24%. The sensitivity of SVM_I model is 94.65%, and the specificity of SVM_B model is 67.00%. Therefore the hybrid SVM model developed in this research improves the specificity of SVM_B model while maintaining the sensitivity of SVM_I model.

• Journal of Information Technology Services
• /
• v.14 no.2
• /
• pp.337-354
• /
• 2015

In a day and age when contemporary businesses are transformed, driven by a service-dominance logic and dependent upon IT, we need to understand how firms cope with technological adaptations and how such technological adaptations can lead to service adaptations. Drawing on a framework on technological transitions and an interpretive longitudinal case study of the services provided by a team within a large public IT firm, this article addresses the following questions : How do service transitions come about? Can we distinguish particular patterns in service transition processes? This research unveils how technological and social dimensions mutually constitute each other within development and implementation of service provisioning. The findings show how：(a) IT plays a fundamental role in service provisioning; (b) technological transitions are the necessary but insufficient preconditions for service transitions; and (c) there are attenuation effects when it comes to the move from technology transition to service transition.

• Applied Chemistry for Engineering
• /
• v.9 no.3
• /
• pp.361-363
• /
• 1998

The CNDO/2 calculations have been applied on cluster models for the representative hydroxyls on faujasite surface to get total energies, dipole moments, Wiberg bond orders and formal charge densities. Quantum chemical calculations indicate that the acid strength of surface hydroxyls of faujasite depends on the geometry of hydroxyls and the Si/Al ratios of framework. The $Br{\ddot{o}}nsted$ acid strength of bridging hydroxyl is higher than that of isolated hydroxyls. The stabilities of cluster models increased with increase of the Si/Al ratios.

• Health Policy and Management
• /
• v.12 no.2
• /
• pp.115-135
• /
• 2002

Many tertiary hospitals have started to establish cooperative relationships with small and medium sized hospitals in Korea. But the performance of the relationship is not satisfactory to both of partners. The relationship and performance of cooperation for small and medium sized hospitals are analyzed according to the framework of inter-organizational cooperation. Data are collected by 4 focal hospital and 34 small and medium sized hospitals through interview and questionnaire. The findings are : a) The cooperation is focused on management area, such as healthcare technology transfer and information sharing, rather than patient referral. b) Patient referral is not yet active in cooperative relationship. But some partner hospitals which is located close and managing internal organization for cooperation show a significant number of referrals. c) The characteristics of high performers are positive attitude about cooperation, and recognition of the relationship as flexible, experiences of cooperation, internal and external management activities.

• Acta Via Serica
• /
• v.4 no.2
• /
• pp.97-118
• /
• 2019

This study presents a new conceptualization of the history of Islamic astronomy. Islamic history is an embedded global cultural phenomenon and will be analyzed at different levels: a) the history of institutional aspects (observatories, including buildings), b) instruments, c) manuscripts, and d) scholars. This phenomenon will be analyzed as a multi-lingual phenomenon with Arabic as the language of sciences as a starting point. Although this is not a study of a geographical region in a narrow sense, it is a historical note on the entanglement of research written in Arabic, Persian and other languages and contextualized in a framework reaching geographically far beyond the confines of the Islamic world and being part of global history.