• Journal of Fisheries and Marine Sciences Education
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• v.26 no.4
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• pp.705-716
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• 2014

This study starts from a question about the expectation that government policy reduces the educational gap by introducing digital textbooks. In addition, we try to figure out how to minimize the problems that will occur when digital textbooks are introduced and fully adopted. The purpose of this study is exploring the possibility that suing digital textbook deepens learning gap among students. Researchers are discussed that the gap between 'information' haves' and 'information' have-nots' and between 'the competent user' and 'the incompetent user' increase difference between 'knows' and 'know-nots' on the socio-economic class. These difference are likely to imply that using digital textbook is deepening the educational gap.

• Journal of Korean Foot and Ankle Society
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• v.24 no.4
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• pp.161-164
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• 2020

A peroneal dislocation is a rare disease that is often misdiagnosed as a simple sprain and can be treated inadequately in the acute phase. For this reason, it is important to have an appropriate diagnosis in the early stages because it can progress to chronic and recurrent conditions. Surgical treatment is considered mainly when progressing to chronic recurrent dislocation. Recently, patients with an acute peroneal dislocation tend to prefer surgical treatment, so accurate initial diagnosis and management are very important. This paper reports a case of chronic recurrent peroneal tendon dislocation in both ankle joints, which was treated by a superior peroneal retinaculum reconstruction and a groove deepening procedure.

• Explosives and Blasting
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• v.25 no.2
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• pp.71-78
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• 2007

In many cases of underwater blasting in South Korea, the special blasting is mainly used for deepening harbor, installing gas pipes, or well blasting to build a bridge. The procedure of well blasting is almost same with shaft blasting, but the difference is that water is filled in before blasting. In case of deepening blasting under water, the first step like drilling, arranging explosives, and wire connection is done on a barge, then the next step such as charging and tamping is accomplished under water by expert divers. Therefore, underwater blasting needs precise and exact plan before blasting. In this paper, authors would like to introduce a case of underwater blasting for deepening the Busan new port with emulsion explosives and non-electric detonators in order to get some of 8,500TEU out sized container vessels entered into the port and to make safe. Considering environment and vibration, the blasting was controlled to minimized the damage to the lighthouse nearby. It will be great help to many other blasting sites where emulsion explosives and non-electric detonators are used for underwater blasting through this case.

• Geomechanics and Engineering
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• v.27 no.5
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• pp.447-463
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• 2021

Caisson-type structures are widely used as quay walls in coastal areas. In Korea, for a long time, many caisson-type quay walls have been constructed with a low front water depth. These facilities can no longer meet the requirements of current development. This study developed a new technology for deepening existing caisson-type quay walls using grouting and rubble mound excavation to economically reuse them. With this technology, quay walls could be renovated by injecting grout into the rubble mound beneath the front toe of the caisson to secure its structure. Subsequently, a portion of the rubble mound was excavated to increase the front water depth. This paper reports the results of an investigation of the seismic behavior of a renovated quay wall in comparison to that of an existing quay wall using centrifuge tests and numerical simulations. Two centrifuge model tests at a scale of 1/120 were conducted on the quay walls before and after renovation. During the experiments, the displacements, accelerations, and earth pressures were measured under five consecutive earthquake input motions with increasing magnitudes. In addition, systematic numerical analyses of the centrifuge model tests were also conducted with the PLAXIS 2D finite element (FE) program using a nonlinear elastoplastic constitutive model. The displacements of the caisson, response accelerations, deformed shape of the quay wall, and earth pressures were investigated in detail based on a comparison of the numerical and experimental results. The results demonstrated that the motion of the caisson changed after renovation, and its displacement decreased significantly. The comparison between the FE models and centrifuge test results showed good agreement. This indicated that renovation was technically feasible, and it could be considered to study further by testbed before applying in practice.

• 대한족부족관절학회:학술대회논문집
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• 2008.11a
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• pp.29-29
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• 2008

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1993.10a
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• pp.546-550
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• 1993

Three basic experiments in agricultural machinery management , strengthening the construction of socialized service system, facilitating the two-level management system in rural areas and carrying through the principle of " paid service ' are described and the main methods of strengthening agricultural machinery management are developed in this paper.aper.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2009.03a
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• pp.27-31
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• 2009

• The Korean Journal of Community Living Science
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• v.18 no.4
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• pp.555-567
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• 2007

The purpose of this study was to test the mediating effects of self-esteem and empathy on university students' motivation for parenthood and their definition of parenthood. Participants were 1,492 students (male 581, female 898) from 19 universities throughout Korea. Results were: (1) The definition of parenthood was explained for motivation of parenthood (male $7{\sim}27%$, female $4{\sim}24%$) and empathy was explained for all the subfactors of motivation of parenthood except 'motivation for traditional norms' (male $4{\sim}16%$, female $2{\sim}13%$). Self-esteem was not explained as motivation of parenthood. (2) There was no mediating effect from self-esteem on motivation for parenthood or the definition of parenthood in any of the students. (3) There was a partial mediating effect of empathy on motivation of parenthood and the definition of parenthood. In male students, there were mediating effects in 'motivation for strengthening biological family ties', 'altruistic emotional motivation', and 'motivation for deepening marital bonds and perpetuating one's self'. In female students, there were mediating effects in 'motivation for strengthening biological family ties' and 'motivation for deepening marital bonds and perpetuating one's self'.

• Archives of design research
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• v.9
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• pp.701-712
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• 1994

We are in the process of the deepening of the informationalized society. Such a phenomenon(of deepening of the informationalized society) means that human being is surrounded by a linguistic or semiological environment instead of realistic experience. And it is concerned with the visual design composed by the visual languages and semiotics of Arts. Because the visual design is a kind of the linguisticsmion using the visual formation. This penomena necessarily brings the expansion of the quatity of information and accompanies the simplification of messages. Therefore when we apply the simplicity resulting from the ideality of KYEORE painting(the folk Art of Korea), it can be cotribute to those who should be in the center of semiological environment more deeply as a source to maximize the effect of communication, which is the conclusion of this study. In sort, the characteristics of our KYEORE painting is the ideal expression. There are found not a few problems such as the depiction of forms, the perspective representation, the chiaroscuro, the expression of material if we evaluate them from the western formative viewpoint. But the depiction of the fact is less direct than the ideal expression itself, is likely to be much complicated, and can be far away from the world of reality. Because it is just the first step for satisfying the ideal images in man. In the composition of KYEORE painting is dominated by the rules nonprescription of time amd place, colloquialism of the meaning, distinction maximization. They are all the compositive characteristics resulting from the ideality. If these characteristics are modulated intelligently to the current thoughts, they will help to build the new visual communication system of Korea which has more direct and fast absorption force.

• The Transactions of the Korea Information Processing Society
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• v.2 no.3
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• pp.354-363
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• 1995

We propose a new search method which is based on the precedence relationship between subgoals.The prosed method reducess both the branching factor of and the depth of the search space by making use of the precedence relationship between subgoals, and further improves the efficiency of A.I.search by immediately achieving directly achievable maximal subgoals and immediately performing the directly applicable actions which must be eventually done.The efficiency of our method has been analysed theoretically.We have also implemented a robot planning system equipped with versions of DFID and IDA which are modified by applying our proposed strategies, and experimentally showed the efficiency of our strategy.