• Bulletin of the Korean Mathematical Society
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• v.50 no.3
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• pp.901-914
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• 2013

Kwon and Bae gave an interpolation for a continuous form of H$\ddot{o}$lder's inequality for a real-valued bounded measurable function on a product of measure spaces. It is given some generalizations of their result.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.10a
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• pp.761-768
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• 1997

Recently, on account of the lack of skilled labor and the increase of labor costs, it has been more difficult the construction environment. Now new methods were developed and used many places. This study is concerning the structural performance of Composite Form Panel Method-one of the new methods-of the wall type. It is available to make monolithic system of bearing wall and half slab. This paper presented design and product data by experiments.

• Journal of the Korean Statistical Society
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• v.25 no.3
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• pp.393-406
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• 1996

We obtain the general moment of non-central Wishart distribu-tion, using the J-th moment of a matrix quadratic form and the 2J-th moment of the matrix normal distribution. As an example, the second moment and kurtosis of non-central Wishart distribution are also investigated.

• Bulletin of the Korean Chemical Society
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• v.19 no.1
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• pp.103-106
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• 1998

The oxidation product bis(2-oxo-3H-1,3,4-thiadiazolidinyl)-5,5-disulfide (5b) was obtained from an attempted synthesis of 5-thioxo-3H,4H-1,3,4-thiadiazolidin-2-one (1). Spectroscopic results indicate that the most stable tautomeric form of 1 is the lactam-thiol form (1b). The computed total energies and relative energies at the MP4 level also showed that the most stable tautomer is 1b.

• Journal of the Korean Chemical Society
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• v.38 no.12
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• pp.864-872
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• 1994

Absorption spectra of thermochromic spiropyran and spirooxazine derivatives were investigated. The effects of solvent polarity on the absorption spectra indicate that the merocyanine-like form of non-substituted spiro compound is likely to the quinoid type. However, the merocyanine-like form of electron-withdrawing substituted spiro compound is likely to the zwitter-ion type. The enthalpy changes between the closed and merocyanine-like forms were measured. The enthalpy change of spiro compound decreases as the solvent polarity increases. The UV-Vis spectrum of merocyanine-like form was resolved into three Lorentzian-Gaussian product bands. The solvent dependence of the amount of the three band was also examined.

• Transactions of Materials Processing
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• v.18 no.1
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• pp.39-44
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• 2009

This paper is concerned with forming technology of an automotive front side member part with ultra high strength steel sheet of DP980. The forming technology considered in this paper is the draw & form type, which installs the upper pad and lower pad to produce the complicated shape of ultra high strength steel sheet. In order to produce sound product, comparison between form type and draw & form type and between draw type and draw & form type are investigated by FE-analysis. FE-analysis is carried out with commercial sheet metal forming analysis S/W, DYNAFORM. It was shown from FE-analysis that the draw & form type satisfied the required specifications such as the dimensional accuracy and soundness of automotive front side member part. The effectiveness of the analytical result was verified by the experiment. From this investigation, the draw & form type is proved to be able to supply useful forming technology in forming ultra high strength steel.

• Journal of the Korean Society for Precision Engineering
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• v.5 no.1
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• pp.40-49
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• 1988

The chip control problem is one of the important subjects to be studied in the metal cutting process. Especially, an important practical problem concerns the form of chips pro- duced in machining since this has important implications relative to : 1. Personal safety. 2. Possible damage to equipment and product. 3. Handling and disposal of swarf after machining. 4. Cutting forces, temperatures, and tool life. However, a dependable way to predict the form of chips in a wide range of cutting conditions has not been established satisfactorily. In this paper, the relationship between the form of chips and the ratios of cutting forces were studied experimentally. According to what the experiments have been carried out in the turning process the main results can be summarized as follows : 1. By use of the multiple linear regression model, emperical formulas which are suitable to wide ranges of cutting conditions with accuracy were obtained satisfactorily. 2. The correlations between the form of chips based upon the classification by Henriksen and the ratios of cutting forces, namely (feeding force/thrust force), (principal force/feeding force) were determined. 3. Using above results, the algorithms which predict the form of chips were constituted. With these algorithms, the form of chips in a wide range of cutting of cutting conditions can be predicted.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2004.10a
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• pp.124-127
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• 2004

In the previous experimental study about extrusion of circular product with four helical fins, it was known that product with helical fins may not to be rotated during extruding with rotating extrusion dies in spite of using twisted dies. According to the results of experiments with Plasticin material, it was anticipated that the extrusion load could be reduced if rotating dies could be used, because it needs high pressure in order to twist billet and form fin shape on the surface of product in the case of using conventional fixed helical dies. So, in this paper, according to the extrusion load analyzed by DEFORM-3D software, optimal rotational velocity of rotating dies can be obtained, and the twisting, angle of product can be analyzed during extruding product with helical fins in the case of two types of rotating of dies. The results of analysis by DEFORM-3D show that the twisting angle of product can be controlled by twisted angle of extrusion helical dies and the rotational velocity of helical dies.

• Journal of Korea Society of Digital Industry and Information Management
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• v.17 no.4
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• pp.109-120
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• 2021

Despite the growing online exposure of retailes, offline retail channels still outperform online channels in the total retail volume of some countries. There is much interest in the physical layout plans of retail stores to expand sales. Product placement that have a large impact on customer purchasing behavior at offline retailers influences customer movement and sales volume. But in many cases, each retailer relies on unsystematic and autonomous product placement. When multiple products are sold with one purchase, the customer's movement for shopping may be evaluated in terms of customer efficiency and additional impulse purchase. In this paper, the social network is applied to sales data of a retail store and the result is used for evaluation of product placement and customer path. The frequent sales product composition was identified using k-core from sales data in the form of shopping baskets. The location was checked for the identified compositions of products, the spatial variance was measured and the customer's path was identified. With these results, the store arrangement of products was evaluated with appropriate improvement directions. The analysis method of this paper can be an alternative analysis approach for better layout of retail stores.

• The Journal of Information Systems
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• v.33 no.2
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• pp.169-189
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• 2024

Purpose The purpose of this study is to identify the influence relationship between BJ interactivity, explicitness of paid advertisements, flow, and product attitude in YouTube muk-bang, and to determine whether there are gender differences in the relationship between them. Design/methodology/approach In this study, an online survey was conducted targeting college students who watch YouTube muk-bang content using a questionnaire form provided by Google. 115 questionnaires were collected from April 1 to 15, 2024, and after excluding 15 insincere responses, a total of 100 questionnaires were used in the final analysis. Findings The results of the empirical analysis are as follows. First, the explicitness of including paid advertising was confirmed to have a significant impact on both flow and product attitude. Second, while BJ interactivity had a significant effect on flow, it was confirmed that it had no significant effect on product attitude. Third, flow was confirmed to have a significant impact on product attitude, and as a result of confirming the moderating effect due to differences between genders in the relationship between the variables set in this study, it was confirmed that there was no moderating effect.