• Journal of the Korean Chemical Society
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• v.7 no.2
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• pp.144-152
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• 1963

A study was made of the effect of composition changes and particle size on appearance of raw bristol glazes fired at cones 5, 8, and 11. Alumina and silica, alkali and lime variations were made to get some of the more promising glazes determining maturing ranges, modulus of rupture, and other factors such as gloss, smoothness, opacity, eggshelling, crazing, pinholing and crawling for each glaze. Modulus of rupture was measured for the glazes fired at only cone 11.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.17 no.10
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• pp.2809-2821
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• 2023

Effective recommendation of similar business groups is a critical factor in obtaining market information for companies. In this study, we propose a novel method for enhancing similar business group recommendation by incorporating derivative criteria and web crawling. We use employment announcements, employment incentives, and corporate vocational training information to derive additional criteria for similar business group selection. Web crawling is employed to collect data related to the derived criteria from 'credit jobs' and 'worknet' sites. We compare the efficiency of different datasets and machine learning methods, including XGBoost, LGBM, Adaboost, Linear Regression, K-NN, and SVM. The proposed model extracts derivatives that reflect the financial and scale characteristics of the company, which are then incorporated into a new set of recommendation criteria. Similar business groups are selected using a Euclidean distance-based model. Our experimental results show that the proposed method improves the accuracy of similar business group recommendation. Overall, this study demonstrates the potential of incorporating derivative criteria and web crawling to enhance similar business group recommendation and obtain market information more efficiently.

• Annual Conference on Human and Language Technology
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• 2007.10a
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• pp.128-133
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• 2007

Focused crawling은 검색시스템의 구축을 위한 웹 문서 수집단계에서, 미리 정의된 토픽 집합들과 관련성을 가지는 웹 문서를 수집하기 위하여 제안되었다. 이러한 focused crawling 연구에서 보다 효과적인 웹 문서 수집을 위해 주어진 토픽에 대한 양질의 배경지식을 제공할 수 있도록 온톨로지가 활발히 활용되어왔다. 그러나 기존의 온톨로지 기반 focused crawling 연구는 토픽과 웹 문서 간의 관련성 측정을 위하여, 주어진 토픽과 관련있는 온톨로지 내 각 개념들에 직관에 의존한 가중치를 부여하여 활용하였다. 하지만 이러한 직관에 의존한 가중치부여 기법은 안정된 수집결과를 도출할 수 있는 최적화된 가중치 값을 얻기가 힘든 한계가 있다. 따라서 본 논문에서는 이러한 개념에 대한 가중치가 학습에 의하여 자동으로 결정되도록, 인공신경망을 적용한 온톨로지 기반 focused crawling 기법을 제안한다. 웹 상에서 제안된 시스템의 성능을 실험한 결과 기존의 온톨로지 기반 수집 기법에 비하여 보다 향상된 결과를 보임을 알 수 있었다.

• Review of Korea Contents Association
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• v.19 no.2
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• pp.13-18
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• 2021

• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.8
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• pp.633-641
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• 2008

Recently, the necessity for diagnosis and management of pipes has emerged as the issue due to contamination of water supply generated by corrosion of pipes. Although inspection has been performed with industrial endoscopes, the method has limits for full diagnosis of pipes due to the lack of working range. As a solution for this problem, many locomotive mechanisms for a micro robot with endoscope functions were proposed. In this paper, we analyze the locomotive mechanism of crawling robot proposed as locomotive device for pipe inspection. Based on a mechanical modeling of motor and micro robot inside small pipe, the theoretical formula for velocity is obtained. This derived theoretical formula is demonstrated the feasibility through the comparison with experimental result. Also, we could find the most important element influencing the moving velocity of micro robot when the robot operates in small pipe. Consequently, it is expected that this study can supply useful information to design of crawling robot to move in small pipe.

• Interaction and multiscale mechanics
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• v.4 no.2
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• pp.165-171
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• 2011

In this study, we proposed a three-dimensional dynamic model under the diffuse interface description for the single crawling cell. From the developed model, we described the clear evolution processes for crawling neutrophil and assessed the reliable quantitative chemotactic property, which confirmed the high possibility of adequate predictions. To establish the system considering of multiple mechanisms such as, diffusion, chemotaxis, and interaction with surface, a diffuse interface model is employed.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10b
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• pp.924-927
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• 1996

In this work, we investigate the quasi-static crawling of the four-bar mechanism. Since the crawling of the mechanism is based on sliding of contact points of the mechanism with the ground, interaction forces and friction forces at contact points of the mechanism with the ground should be computed. For this purpuse, we introduce the concept of imaginary joints to find these forces. Therefore, we are able to treat the closed mechanism as a serial one. Also, sliding conditions of the mechanism in quasi-static equilibrium are examined. Lastly, the required torques for the mechanism to crawl with respect to various configurations of the mechanism but with a fixed ground friction are investigated.

• Journal of Institute of Control, Robotics and Systems
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• v.8 no.3
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• pp.226-232
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• 2002

In this work, the quasi-static crawling of the four-bar mechanism is investigated. Since the crawling of the mechanism is based on sliding of contact points of the mechanism with the ground, interaction forces and friction forces at contact points of the mechanism with the ground should be computed. For this purpose, we introduce the concept of imaginary joints to find these forces and treat the closed mechanism as a serial one. Lastly, the required torques for the mechanism to crawl with respect to various configurations of the mechanism on a flat ground with uniform friction coefficient, based on sliding conditions of the mechanism in quasi-static equilibrium, are investigated.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.241-244
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• 2017

인터넷을 이용하는 사용자들은 원하는 정보를 획득하고 타인들과 소통하기 위한 방법으로 소셜 네트워크 서비스를 이용한다. SNS는 사용자별로 차별화된 기능을 제공함으로써 수요자를 증가시키지만 이를 활용하는 사용자들은 무분별한 콘텐츠를 접함으로써 사용자 인터페이스에 대한 불편함은 더해가고 있다. 본 연구는 SNS를 이용하는 사용자들의 사용자 편이성을 증가하고 콘텐츠 접근성을 강화하는 방안으로 원하는 관심사만 자동으로 수집하여 열람하도록 JAVA WEB CRAWLING을 활용하여 시스템을 개발하였다.

• Journal of Multimedia Information System
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• v.8 no.1
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• pp.69-74
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• 2021

This paper accumulates the product structure data such as bond obligation ratio and investment ratio for variable insurance using crawling from the insurance company's API, also accumulates variable insurance income and project expenses for variable insurance using crawling from the API of life insurance association. From these accumulated data, the correlation coefficient between fund product and customer preference is calculated with an investment algorithm, and variable insurance funds by customer investment preference and product structure are recommended according to market conditions. From the simulation results, it is shown that the proposed variable insurance management system properly recommends and manages variable insurance according to customer preferences.