• The Journal of the Acoustical Society of Korea
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• v.37 no.5
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• pp.338-342
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• 2018

In order to solve the floor impact sound problem in the upper and lower floors, the Ministry of Land, Transport and Maritime Affairs also notifies the physical properties of the resilient material affecting the floor impact sound level. The dynamic modulus of elasticity and the loss factor before and after heating are most related to the floor impact noise, especially for the cushioning material. Therefore, in this study, the rate of change with respect to the dynamic modulus and loss factor with temperature change was examined by increasing $10^{\circ}C$ by $10^{\circ}C$ from the temperature condition of $70^{\circ}C$ specified in the standard. The dynamic modulus of elasticity and the loss modulus were measured by using the pulse excitation method for eight kinds of samples. The calculation method was calculated by the time series analysis method using the damped vibration waveform.

• The Journal of Society for e-Business Studies
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• v.9 no.2
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• pp.183-201
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• 2004

Not only Enterprise Application Integration (EAI) within a company but also business-to-business integration (B2Bi) should be achieved for companies to collaborate seamlessly through the Internet. There have been great efforts in this area of EAI and B2Bi, resulting in lots of solutions in the market. However, EAI and B2Bi systems have been designed and operated in independent platforms and environments causing a serious problem of integrating EAI and B2Bi systems. In this paper we have proposed a business integration platform for connecting EAI and B2Bi systems in a uniform architecture and also coping with changes in business environments. In the integration platform proposed in this work, collaboration processes between B2B companies can be performed using Web Services technology widely considered as B2B integration platform. Especially, we have defined basic business execution elements based on a thorough analysis of various business integration standards and developed an efficient and extensible business process engine for B2B collaboration process management. A Web-based order processing system is developed for validation of our integration platform. It is expected that the level of B2B collaboration can be enhanced using the integration platform and furthermore it will contribute to more collaborative B2B commerce.

• The Journal of Society for e-Business Studies
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• v.8 no.2
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• pp.77-98
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• 2003

A web-based information system, that is a dominant type of information systems, suffers from the "web crisis" in development and maintenance of the system. To cope with the problem, a technology of software clustering to web-based application, which is one of web engineering, is strongly needed. In this paper, we propose a Form Clustering Algorithm along with an application example, which are used for internal-system reengineering to web-based information system. A Form Clustering Algorithm focuses on Page-model which is the feature of the web among the various web-based information system's structural model. Specially, we applying distance matrix to navigation model of graph form for easily analyzing, and web log analysis for identifying core function object that have a highly loading. Also, we create web software structure that can be used to maximize reusability and assign hardware effectively through 2-phase clustering step. Form Clustering Algorithm might be used at web-based information system development and maintenance for reusable web component development and hardware assignment, respectively.

• Journal of The Korean Association of Information Education
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• v.8 no.2
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• pp.227-238
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• 2004

While the first step of the comprehensive plan for educational informationization focused on the infrastructure establishment, the second step aims to develop creativity and problem solving skills of students through the use of Information and Communication Technology(ICT). The purpose of this research is to investigate the current status of the educational use of ICT in elementary schools, and to give guidelines for future educational informationization. Four aspects of ICT(i.e., school environments, teachers' abilities to use ICT, methods for using ICT in class, and factors hindering the use of ICT in schools) were examined in the survey. From the survey, it is found that ICT is now used in schools more actively than before. However, it is also found that more efforts need to be made in some areas such as instructional strategies using ICT in class, and the design and the management of teacher training programs.

• Journal of The Korean Association of Information Education
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• v.17 no.1
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• pp.43-52
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• 2013

As a tool of programming education, a robot is effective in creative problem solving abilities and logical thinking skills. It also provides practical, operational learning experience to learners, when using as a tool of learning, it can help learners' specific understanding for the contents of education and lead to an active participation in learning. This research focuses on the robot's instrumental use in the mathematics class. So the lesson activities with relation to the fourth grade math curriculum were developed after the functional analysis of the robot and the extraction of educational utilization with function. The result shows that there wasn't a significant difference in achievement test but there was a positive response in the most of the survey items. It shows that robots lead to an active participation in class, to be interested in math class and were helpful to understand math concepts. There was also a positive response in the result of learner interviews such as dynamic, collaborative communication, experiential, practical lessons that are rare sights in normal math class.

• Journal of Global Scholars of Marketing Science
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• v.15 no.1
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• pp.61-79
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• 2005

A critical incident technique(CIT) was employed to show the results of empirical findings regarding hotel services. The major purpose of this study was to describe and analyze service failures from the customers' point of view and thus suggest strategic implications for hotel service providers. Four-hundred sixteen service failure anecdotes from hotel customers were classified using Hoffman et al.'s(1995) approach. The CIT data showed the three major categories and eleven sub-categories and revealed that, in general, tangible recovery(e.g., upgrade, free meal, discount) was more effective than intangible one(e.g., explanation, canned apology, manager's apology). Interestingly, however, sincere apology seemed to be a better recovery strategy than other types of tangible recovery. Furthermore, the results showed that severity of service failure had its own impact on customers' perception regarding hotel's service recovery efforts. In particular, irrespective of service recovery, severity of service problem was negatively related to intention to repurchase. Managerial implications and future research agenda was also discussed.

• Journal of Korean Academy of Nursing
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• v.29 no.6
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• pp.1221-1232
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• 1999

The purpose of this study was to study how nurses interpreted the meaning of Hwa-Byung. It was carried through a review of literature, and the result is expected to explore ways that nursing intervention can promote the understanding of Hwa-Byung. The literature review focused on cultural psychology and psychiatrists' views toward Hwa-Byung. After that, it was reconfirmed concept of Hwa-Byung in nursing devived from historical analysis of the examples of Hwa-Byung from a true record of the Cho-Sun Dynasty(CD ROM, 1997). Characteristics of patients with Hwa-Byung include 'Hwa', an aspect of somatization, and self-diagnosing. It also could find that Hwa-Byung is characterized as 'Hwa', 'somatization' and 'self-diagnosis(subjectiveness)' according to a true record of the Cho-Sun Dynasty(CD ROM, 1997). The conceptual definition of 'Hwa', 'somatization' and 'self-diagnosing (subjectiveness)' are as follows. The core concept of Hwa-Byung, 'Hwa,' has the property of 'fire', and equals the feeling of injustice. Hwa-Byung means congestion of 'Hwa'. Therefore Hwa-Byung is the accumulation of being mistreated and mortified. The feeling of mistreatment comes from subjective experiences, which cannot be in harmony with the values, beliefs and rights of the patients. The situations that they have to endure again and again, though they are the sufferers, connote suppressed aggression and powerlessness endured over time. Suppressed aggression subordinated hostility, hatred and revengeful thoughts; powerlessness subordinates frustration, resignation, and fatalism. Somatization is another form of expressing 'Hwa' through physical symptoms. The somatization of clients with Hwa-Byung plays a role in expressing non-verbalized and suppressed emotions within themselves. The clients who experiences Hwa-Byung think that they know the cause of their illness and self-diagnose their problem as Hwa-Byung. Therefore, the feeling of unfairness which is the premise of Hwa-Byung infers 'subjectiveness' In conclusion, nursing's concept of Hwa-Byung is the accumulation of feelings of being mistreated and mortified. Hwa-Byung is the internalized 'Hwa' from enduring again and again. The feeling of being mistreated comes from subjective judgements about unfairness that cannot be harmonized with the clients' values, beliefs and rights. Those who can express their 'Hwa' only through their bodies imply suppressed aggression and powerlessness.

• The korean journal of orthodontics
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• v.28 no.6 s.71
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• pp.937-946
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• 1998

The patient with an anterior open bite has one of the most difficult orthodontic problem to correct. Previous studies have yielded different conclusions as to exactly where the morphologic problems associated with vertical dysplasia-high angle cases are located. In order to identify the cephalometric features of high angle cases and highlight the measurements that characterize high angle cases, 109 pretreatment cephalograms, 35 high angle, 37 average angle, and 37 low angle cases, were analyzed and compared statistically. As the mandibular plane was steeper, the anterior facial height, especially lower anterior facial height, became greater, and the posterior facial height became smaller. All the dentoalveolar vertical dimensions, especially in upper, increased. And all the skeletal angular measurements increased. Especially Lower genial angle had most positive correlation to mandibular Plane angle. Upper incisor was lingually inclined, and lower incisor was labially inclined in high angle cases.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.27 no.3
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• pp.209-213
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• 2001

Treatment of oral cancers with chemotherapeutic agents are evaluated as an effective method for remission to reduce cancer proliferation nowadays. But, minimization of side-effects such as bone marrow suppression, gastrointestinal toxicity and renal damage is another problem to be solved. Thus, a possible approach to develop a clinically applicable chemotherapeutic agents is to screen anticancer activity among traditional medicinal plants which have been used for thousands of years with very low side-effects in orient. In this study we focused on anti-oral cancer activities of momordin, which was medicinal plant extracts that was revealed anticancer activities, on KB cell(oral cancer cell). The results were as follow : 1. Momordin showed the excellent anti-oral cancer activity against KB cells. Obtained IC50 value of Momordin was $10.4{\mu}g/ml$. 2. When KB cells were treated with Momordin, dose and time dependent DNA fragmentation of KB cells were observed. DNA fragmentation was initiated on three days at the concentration of $20{\mu}g/ml$ Momordin. 3. Flow cytometry showed dose-dependent apoptotic cell increase of KB cells on Momordin. 18.55% apoptotic cell were observed up to 72 hours at the concentration of $20{\mu}g/ml$ of Momordin. 4. Momordin induced nonspecific apoptosis without specific cell cycle arrest. 5. Through MTT assay, DNA fragmentation assay and flow cytometric analysis. anticancer effect of Momordin against KB cell was induce of apoptotic cell death.

• The Journal of Korean Academy of Prosthodontics
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• v.43 no.4
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• pp.415-425
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• 2005

Statement of problem : Fracture of composite resin core will be occulted by progress of crack. Bonding interface of different materials has large possibility of starting point of crack line. Therefore, the bond strength of glass fiber post to composite resin core is important for prevention of fracture. Purpose: This in vitro study tried to find out how to get the higher strength of glass fiber post to composite resin core through surveying the maximum load that fractures the post and cote complex. Materials and methods: 40 specimens made with glass fiber Posts(Style $post^{(R)}$, Metalor, Swiss) and composite resin core ($Z-100^{(R)}$, 3M, USA) were prepared and loaded to failure with push-out type shear-bond strength test in a universal test machine. The maximum fracture load and fracture mode were investigated in the specimens that were restored with four different surface treatments. With the data. ANOVA test was used to validate the significance between the test groups, and Bonferroni method was used to check if there is any significant statistical difference between each test group. Evely analysis was approved with 95% reliance. Results: On measuring the maximum fracture load of specimens, both the treatments of sandblasted and acid-etched one statistically showed the strength increase rather than the control group (p<0.005). The scanning electric microscope revealed that sand blasting made more micro-retention form not only on the resin matrix but on the glass fiber, and acid-etching contributed to increase in surface retention form, eliminated the inorganic particles in resin matrix. Specimen fracture modes investigation represented that sand blasted groups showed lower bonding failure than no-sand blasted groups. Conclusion: Referring to the values of maximum fracture load of specimens, the bonding strength was increased by sand blasting and acid-etching.