• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.516-522
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• 2020

Water trees can cause considerable damage to the performance of underground cables. Theymay formwithin the dielectric used in buried or water-immersed high voltage cables. They grow in a bush-like or tree-like form, often taking decades before causing damage to a cable's performance. They are usually found on very old underground cables, often in an inaccessible place. It is costly and time-consuming to detect watertrees in underground cables. Tree detection technology, including mathematical modeling,can reduce the maintenance cost and time necessary for detecting these trees.To simulate detection of water trees in this study, a mathematical model ofan XLPE cable and a water tree were developed. The complex water tree structure was simplified, based on two identified patterns of aventedtree. A Matlab simulation was performed to calculate and analyze the capacitance and resistance of a cable insulation layer,based on growth of a watertree. Capacitance size increased about 0.025×10^-13[Farads/mm] compared to normal when the tree area of the cable was advanced to 95% of the insulation layer. The resistance value decreased by about 0.5×10¹⁶[ohm/m]. These changesand changesshowninaBurkes paper physical modeling simulation are similar.The value of mathematical modeling for detecting water trees and damage to underground cables has been demonstrated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.4
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• pp.1672-1683
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• 2012

The purpose of this descriptive survey was to investigate the duration of exclusive breastfeeding practice and its related factors of married immigrant Vietnamese women. And to provide baseline information necessary to develop education programs for the promotion of exclusive breastfeeding practice among them. 125 married immigrant Vietnamese women with a child between 6 months and 60 months old were conveniently recruited in two Multi-cultural Family Support Center in Chungcheong area. Data were collected through interviews using a structured questionnaire of Korean and Vietnamese versions. The data were analyzed using frequencies, t-test, ANOVA, Stepwise multiple regression with SPSS 18.0 program. The results were as follows; 1) The mean duration of exclusive breastfeeding of the subjects was 15.9 weeks. 2) As the infants grows older, the rate of formula feeding and mixed feeding were markedly increased. 3) Stepwise multiple regression analysis indicated that breastfeeding education and family type were significant determinants of the duration of exclusive breastfeeding practice. This model accounted for 30.8% of the duration of exclusive breastfeeding practice. Based on these results, we recommend to develop systematic breastfeeding education program in order to promote the duration of exclusive breastfeeding practice among married immigrant Vietnamese women.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.10
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• pp.454-461
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• 2017

The purpose of this study is to investigate the types of domestic safety accidents involving children and to verify the difference of safety knowledge according to variables of parents. Subjects include 226 parents who have 3-5 year old infants enrolled in kindergartens and day care centers in I-city, Jeollabuk-do. The study tools are modified and complemented questionnaire for the study purpose referred to the preceding research data and the literature. For the processing of collected data, frequency analysis, descriptive statistics, one-way ANOVA, and the Duncan post-test were utilized using the SPSS program. The results of this study are as follows: First, safety accidents occurred at the majority of homes which have infant children. On average, the occurrence frequency was 1.78 times per six months. The accidents involving infants occurred in the order of drop or slip, crash or impact, stricture or jamming, fall, stab or cut, burn, swallow or inhalation. Second, both parents had an average level of safety knowledge. There was a distinction in the areas of 'fall' and 'first aid' according the mother's age. In addition, stay-at-home mothers had the higher level of safety knowledge compared with working mothers in the areas of 'general safety knowledge' and 'fire'. There was a distinction in the area of 'fire' according to the father's age. Given these findings, safety training programs for parents to improve safety knowledge needs to be developed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.10
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• pp.559-568
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• 2017

recent times, the monthly rent in the Jongno-gu Historical and Cultural Street in Seoul has rapidly increased, because of the presence of large-scale franchises and the entry of private investment into the traditional and local businesses focusing on Bukchon, Seochon, Insa-dong, and Samcheong-dong. As a result, the business environment for these merchants has worsened, due to the increasing economic burden. In order to maintain the business environment of the merchants, it is necessary to evaluate the potential for establishing a regional commercial area, in order to resolve the problems of the existing commercial areas and to improve the locational, economic, cultural and political environment. This study analyzed the factors influencing the merchants' satisfaction with the business environment as a function of their age, by considering three age groups, viz. 30-49, 50-59, and more than 60, considering the locational, economic, cultural and political environment of the merchants. Among the factors influencing the satisfaction with the business environment, the merchants in their 30s and 40s placed more emphasis on the traffic accessibility, floating population, store premium and monthly rent than the other age groups. Among the factors influencing the satisfaction with the business environment, the merchants in their 50s placed more emphasis on the cultural organization, artist activities, expansion of community support facilities, and banning of franchises in certain locations than the other age groups. Among the factors influencing the satisfaction with the business environment, the merchants over 60 years old placed more emphasis on the walking accessibility, monthly sales, merchant community, preservation of historical and cultural landscape, and commercial protection of the government than the other age groups.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.4
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• pp.452-462
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• 2020

This study analyzed the impact of resilience on the job satisfaction of middle-aged employees and the meditating effect of retirement attitude. The survey was administered to 468 regular workers aged 40 or older in Seoul and the surrounding metropolitan area. This study utilized SPSS 19.0 statistical program, and multiple regression and mediated effect analyses were applied with descriptive statistics, reliability and validity of measurement tools to analyze differences between correlations and groups. First, male workers had higher self-regulation ability and job satisfaction than women. Female workers had higher old age rest than male ones. The higher the educational background, the higher the recognition of retirement as a new beginning, The longer the working years, the higher the self-regulation ability and job satisfaction. The higher the household income, the higher the positiveness. Second, the Resilience had a positive effect on job satisfaction. Third, resilience had had a negative impact on the forced frustration and a positive influence on the new beginning of retirement attitudes. Fourth, the forced frustration and new beginning showed mediating effects of resilience and job satisfaction. The study results confirmed the importance of resilience and demonstrated the need for measures to enhance resilience in order to reduce anxiety about retirement and increase job satisfaction.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.1
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• pp.111-120
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• 2019

This study is a quasi experimental study to investigate the effects of stroke prevention education program of Oriental Nursing on self-health perception, health behavior change, self-care and physiological index of adults over 55 years old and elderly people. The data were collected from August 12 to November 29, 2017. The 53 study subjects comprised 26 experimental subjects who agreed to participate in the education program and 27 control subjects. In the results, there was no statistically significant difference between the experimental group and the control group in general characteristics and research variables before the program; further, the two groups were homogenous. In the hypothesis test, the change in self-health perceptions of the experimental and control groups was t = -5.28 (p <.001), health behavior change was t = -4.24 (p <.001), self-care was t = -5.28 (p <.05), systolic blood pressure was t = 2.48 (p <.05), diastolic blood pressure was t = 2.78 (p <.05), and cholesterol was t = -3.94 (p <.001). There were statistically significant differences between the two groups and all four hypotheses were supported, which demonstrated the effectiveness of the program. These study results suggest that it is an effective program to change the self-perception of health and health behavior, improve self-care ability, and control the physiological index. It is expected that these findings will be useful in developing a future effective oriental nursing intervention. The education program should be continuously carried out, and the area needs to be expanded.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.5
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• pp.591-598
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• 2019

The statistics of committing suicide in S. Korea is ranked in top with serious attempts of falling among OECD countries since 2003. The rates is slightly dropped by 5 percent point, nevertheless the falling is still high for the age of over 10 years old and this matter must be solved. Most of the case of suicides are the falling based on a trend view of falling which is serious matter and cannot be solved easily for both domestic and foreign countries. For example, the steel net of falling prevent was installed in the Golden Gate Bridge costed by 200 million-dollar. In New Zealand, the steel net of falling prevention had been removed and re-installed beccause of the high suicide rates. Canada and Australia also surrounded the bridge with steel fences to prevent suicide without consideration of the beauty of bridge. Therefore, this paper suggested a comparison study on both falling prevention systems in all countries and patent technologies. Also, it covers the blocking skills of approach in both security and limited area. This paper suggested the technical Rollinder system equipped with the mechanical apprentice to prevent effectively the falling sucides and wall passing. Before the installation of Rollinder System by 2016, there were 33 person who tried to fall in the river in Machang Bridge. However, the number of the committing suicides were dramatically reduced to zero after the installation of the system.

• Journal of the Korean Society for Marine Environment & Energy
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• v.13 no.4
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• pp.313-326
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• 2010

This paper explores the changing aspects of the fishing village and fishermen since the beginning of the Saemangeum Reclamation Development Project in 1991. The Saemangeum Project was neither appropriate nor effective because it adopted an outdated development policy. It should have been obvious that as a result of the Project, tideland where various kinds of clams, crabs, oyster, and many other marine resources live would be lost. The fishermen in the affected area have suffered various hardships. The most acute problem at present is the disappearance of their subsistence activity that threatens their families' survival. Facing the crisis, they view fishing as their most valuable resource. Overlooking the Saemangeum Lake which is newly formed, they view the sea and tideland as their treasure boxes or bank deposits. From the beginning until now, the government did not pay attention to the concerns of the fishermen and their communities. It was an outcome of the typical top-down bureaucratic decision making. Until recently the government has persisted in its position that the primary goal of the reclamation project was to increase agricultural land. In July 23, 2009, the government suddenly announced the new Saemangeum development plan. The new plan focusing on the industrial city complex was quite different from the old plan. Regardless of the revised plan the lives of the villagers in the coastal areas have already been significantly altered. Most villagers no longer depend on fishery. Many have already left their homestead and moved away in order to search new jobs or find another coastal area where they can continue their fishing.

• Journal of the Korean association of regional geographers
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• v.5 no.2
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• pp.119-132
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• 1999

The Korean Peninsula, jutting southward from the Asian mainland into the Pacific Ocean, is surrounded by numerous bays and islands on three sides. The study area of this research is the coastal area surrounding the Sacheon Bay, which is located in the mid-southern tip of the peninsula. Historically, the bay region took the role of the main gate leading to the western part of Kyung-nam Do(Province) due to the fact that the bay is the nearest coast to Chinju, the central city of the province. The Sacheon Bay had provided important sea routes from the old days until the early twentieth century. Because of the bay's sea routes, the bay region has been militarily of great significance. Recently, road/rail/highway/airplane transportation functions have become gradually increased but sea transportation function has been decreased in the region. As the Sacheon Bay was rich in fishery resources, dozens of fishing villages in the bay region depended on fishery and marine product industries for long years. But the inflow of the fresh water used to cause serious damage to the fishing industry in the bay region after a drainage canal from the Nam River was constructed in 1969. As a result, the industry has dwindled gradually for last decades. Recently, a couple of industrial parks were constructed along the coast and many manufacturing factories were built on the parks. It has been expected that many jobs lost in fishery and agriculture are replaced by new opportunities in industry. More than half of the workers employed in the parks' factories commute from the city of Chinju. It is asserted in this paper that the transportation, fishery, manufacturing, and tourism functions of the Sacheon Bay region are closely associated with. The characteristics of the region can be well understood through the functional changes and associations.

• Korean Journal of Environment and Ecology
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• v.31 no.1
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• pp.1-23
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• 2017

Gwangchiryeong, located adjacent to the Korean DMZ, is a mountain pass connecting Yang-Gu, Gangwon-do with In-je. It reaches a height of 800m (2,624ft) and stands on the flank of Mt. Daeam-san, which has an elevation of 1,304m (4,278ft). It is important to survey the flora of Gwangchiryeong in that not only the area encompassing the waterfall and the valley along with dense old-growth forest has various plant species but also it is a way to make out what kind of plant species exist in the DMZ due to the geographical characteristics of Gwangchiryeong adjacent to the Korean DMZ. Therefore, this study was conducted to elucidate the distribution of vascular plants and their value in Gwangchiryeong. The vascular plants that were collected 9 times from April 2014 to September 2015, and consisted of a total of 513 taxa: 88 families, 297 genera, 441 species, 4 subspecies, 62 varieties and 6 forms. Among those observed species, the rare plant species designated by Korea Forest Service were 22 taxa including Hanabusaya asiatica, Paeonia japonica, Saxifraga octopetala, etc. Endemic species were 22 taxa containing Cirsium setidens, Heloniopsis koreana, Salvia chanryoenica, etc. 18 taxa were recorded as naturalized plants and their naturalized rate and urban index were noted as 3.5% and 5.6%. Among the surveyed 513 taxa, edible, medicinal, pasturing, ornamental, timber, dye, fiber and industrial plants were 197 taxa, 154 taxa, 180 taxa, 49 taxa, 24 taxa, 8 taxa, 4 taxa and 3 taxa, respectively.