• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.11
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• pp.747-754
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• 2017

The Concrete-Filled Tube (CFT) system was developed for its excellent structural performance, such as its good stiffness, stress and ductility, which is derived from the mechanical advantages of its composite structure. However, it is known that the flat type of reinforcing plates need stiffeners placed at a certain distance from each other to avoid buckling failure, which increases the cost accordingly. This paper investigates the contribution of the rib elements placed inside the steel tube for the purpose of increasing the bond strength between the steel and concrete and fire performance with no additional protection. The test results also demonstrate the effectiveness of the corrugated rib's shape against fire. The results of this study showed that the buckling prevention and fire resistance performance criteria were satisfied by the application of the inner surface attachment rib, due to the resulting increase in the strength of the CFT column. Therefore, it is considered that the CFT method using the corrugated rib structure reinforcement developed through this study satisfies the structural and fire resistance performance criteria without the need for a refractory coating. Future studies will be needed to make the process efficient and economical for factory production.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.11
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• pp.16-22
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• 2017

This study examined the status of resident evacuation sites notified to nearby communities, centered on business sites subject to the risk management plan of Incheon, Siheung, and Ansan. Through an analysis of the meteorological data, the direction of improvement of the site selection process for the safe evacuation of chemical accidents was studied. Among a total of 111 evacuation sites, 30 schools were selected the most, and 2-3 sites were usually selected for evacuation. As a result of an analysis of the Incheon meteorological data of 2016, the frequency of occurrences was 18.8525% in the NNE wind direction, 18.0328% in the NNW wind direction, 12.2951% in the WSW wind direction, 9.0164% in the SSE direction, 8.4700% in the SW direction, 6.5574% in the W direction, and 5.7376% in the S direction. The NNE wind direction showed the highest frequency, but the other winds showed a relatively high frequency, indicating that the annual wind direction was not biased toward one side.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.11
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• pp.770-777
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• 2017

Building information modeling (BIM) has been receiving attention as an integrated information model instead of CAD since the 2000s. BIM technology was first used in the architectural field and was later introduced to the civil engineering field. However, the government announced a plan for the application of BIM to 20% of all SOC projects from 2020, so the adoption of BIM technology is expected to accelerate. In order to successfully adopt BIM, a systematic structure should be supported for integrated design information and implementation technology. Also, it is important to establish the relationship between information systems because many complicated factors are intertwined in the construction industry. In this study, we propose a framework for constructing integrated information through identifying the information relations for introducing BIM in the civil engineering industry. We applied this framework to a bridge project to confirm its effectiveness. This study can be applied to the integrated management of the construction process and costs by introduction of a work breakdown structure (WBS) to BIM. In addition, this study is expected to contribute to the adoption of BIM in the civil engineering field through the proposal of information system standardization in this field.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.7
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• pp.315-324
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• 2018

This study was conducted to identify and analyze the educational needs for program outcomes in nursing students. Participants included 256 nursing students at K college, and a survey was conducted from October 30 to December 22, 2017. Data was analyzed with SPSS WIN 20.0 using descriptive statistics, t-test, ANOVA, Borich's Needs Analysis, and the Locus for Focus Model. Results found that subjects recognized that the present level was high about 'Apply therapeutic communication skills,' 'Provide fundamental nursing skills' and 'Understanding nursing profession standards'. 'Provide fundamental nursing skills', 'Apply a nursing intervention', 'Understanding legal and ethical standards of nursing practice and implementation' were the most important sub-elements of program outcomes. In according with the Borich's needs value and the Locus for Focus Model, 'Apply a nursing intervention', 'Explain the importance of the role and cooperation within the healthcare team', 'Provide fundamental nursing skills', 'Execute the nursing process', 'Understanding the legal and ethical standards of nursing practice and implement' were identified as the top priorities of educational needs. Results of this study are expected to be used as basic data to develop outcome-based curriculum and nursing education programs.

• Journal of KIISE:Software and Applications
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• v.36 no.10
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• pp.777-785
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• 2009

Collaborative filtering is a technique used to predict whether a particular user will like a particular item. User-based or item-based collaborative techniques have been used extensively in many commercial recommender systems. In this paper, a hybrid collaborative filtering method that combines user-based and item-based methods using a low-dimensional linear model is proposed. The proposed method solves the problems of sparsity and a large database by using NMF among the low-dimensional linear models. In collaborative filtering systems the methods using the NMF are useful in expressing users as semantic relations. However, they are model-based methods and the process of computation is complex, so they can not recommend items dynamically. In order to complement the shortcomings, the proposed method clusters users into groups by using NMF and selects features of groups by using TF-IDF. Mutual information is then used to compute similarities between items. The proposed method clusters users into groups and extracts features of groups on offline and determines the most suitable group for an active user using the features of groups on online. Finally, the proposed method reduces the time required to classify an active user into a group and outperforms previous methods by combining user-based and item-based collaborative filtering methods.

• Journal of KIISE:Software and Applications
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• v.36 no.10
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• pp.800-815
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• 2009

Recently, Web services based service-oriented architecture is widely used to integrate effectively various applications distributed on the networks. In the service-oriented architecture BPEL as a standard modeling language for the business processes provides the way to integrate various services provided by applications. Over the past few years, some types of studies have been made on testing compatibility of services and on discriminating and tracing of the business processes in the services composition. Now a lot of studies about the services composition with BPEL are going on. However there were few efforts to solve the problems caused by the services composition. Especially, there is no effort to evaluate whether a composite service is reliable and whether it is robust against to exceptional situations. In this paper, we suggest a test framework and a testing method for robustness of the composite service written in WS-BPEL. For this, firstly we extract some information from the BPEL process and the participant services. Next, with the extracted information we construct the virtual testing environment that generates various faults and exceptional cases which may be raised within the real services. Finally the testing work for robustness of a composite service is performed on the test framework.

• Journal of KIISE:Software and Applications
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• v.36 no.10
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• pp.836-850
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• 2009

Human posture recognition has attracted tremendous attention in ubiquitous environment, performing arts and robot control so that, recently, many researchers in pattern recognition and computer vision are working to make efficient posture recognition system. However the most of existing studies is very sensitive to human variations such as the rotation or the translation of body. This is why the feature, which is extracted from the feature extraction part as the first step of general posture recognition system, is influenced by these variations. To alleviate these human variations and improve the posture recognition result, this paper presents 3D Star Skeleton and Principle Component Analysis (PCA) based feature extraction methods in the multi-view environment. The proposed system use the 8 projection maps, a kind of depth map, as an input data. And the projection maps are extracted from the visual hull generation process. Though these data, the system constructs 3D Star Skeleton and extracts the rotation invariant feature using PCA. In experimental result, we extract the feature from the 3D Star Skeleton and recognize the human posture using the feature. Finally we prove that the proposed method is robust to human variations.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.294-302
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• 2020

In a genetic algorithm, computer simulations are performed based on the natural evolution process of life, such as selection, crossover, and mutation. The genetic algorithm searches the approximate optimal solution by the parallel arrangement of Schema, which has a short definition length, low order, and high adaptability. This study examined the possibility of improving the efficiency of the optimal solution by considering the characteristics of the building block hypothesis, which are one of the key operating principles of a genetic algorithm. This study evaluated the efficiency of the optimization results according to the gene sequence for the implementation in solving problems. The optimal design problem of the water pipe was selected, and the genetic arrangement order reflected the engineering specificity by dividing into the existing, the network topology-based, and the flowrate-based arrangement. The optimization results with a flowrate-based arrangement were, on average, approximately 2-3% better than the other batches. This means that to increase the efficiency of the actual engineering optimization problem, a methodology that utilizes clear prior knowledge (such as hydraulic properties) to prevent such excellent solution characteristics from disappearing is essential. The proposed method will be considered as a tool to improve the efficiency of large-scale water supply network optimization in the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.656-663
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• 2020

The study analyzed how F. L. Wright's architectural design concept changed based on Taliesin West (1940). According to the analysis, F. L. Wright was also influenced by the ancient Mayan civilization in addition to the Froebel block and Japanese culture. Wright realized the design style of Mayan civilization directly at the Biltmore Hotel, which is located near Taliesin West. Later, Wright's architectural design elements changed considerably. In particular, the local characteristics of Arizona, where Taliesin West is located, desert climate, and Cherokee Red, the color of ocatilla cactus growing in the desert, have been applied in his symbolic colors of his architecture. The following is a summary of the changed design concepts compared to before 1940: 1) A square module was used for floor plans before 1940 that later changed to a design concept called a circle and spiral. 2) The form of a column that simply emphasized its verticality changed to various shapes. 3) The gable roofs used in the early days of Wright's architecture changed to various forms that rose into the sky after 1940. This change was seen as the culmination of potential experiences that had not been realized before 1940.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.223-229
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• 2020

Biodiesel produced using microorganisms, which are recognized as the third-generation biomass, is among the various known renewable energy sources that can replace fossil fuels used in conventional transportation. Scenedesmus obliquus has been identified as an excellent species for biodiesel production, as it grows faster and can accumulate up to 40-50 percent of the dry cell weight. Enhancing production using S. obliquus requires measuring the cell mass for controlling the cultivation process. In the current study, S. obliquus was cultured for 75 days, and growth changes of the microalgae were measured by absorbance, microscopic imaging, and Raman spectroscopy. Between days 60 to 75 of culture, the change in absorbance was observed to be less than 3%, whereas the number of microalgae observed microscopically was more than three times higher. Moreover, the Raman spectroscopy results showed three strong peak values of β-carotene at 997 cm^-1, 1148 cm^-1, and 1515 cm^-1, with peak values of β-carotene showing greater than 3-fold increase during the culture period. Therefore, we predict that application of Raman spectroscopy will help in identifying the growth elements and growth degree in microalgae culture during increased biomass production.