• Proceedings of the KIEE Conference
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• 1998.07e
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• pp.1592-1595
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• 1998

The rock fragmentation system with a capacitor bank, switching device, cable and blasting electrode are described. Utilization of the chemical energy from the electrolyte and the pseudospark with a large current capacity suggested the commercialization possibility of the rock fragmentation system. The vibration and noise level of the pulsed blasting is acceptable in the most ground breaking. And also the electromagnetic force produced by the inductor is introduced for the rock fragmentation.

• Resources Recycling
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• v.31 no.1
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• pp.65-77
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• 2022

A study was conducted in Korea on the leaching behavior and possibility of recovery of vanadium and other valuable metals from domestic vanadium titanomagnetite (VTM) by direct acid leaching. In this study, a VTM concentrate containing 0.8% V₂O₅ was used, and the ratio of magnetite to ilmenite was calculated as 1.9:1 by using the HSC program. The leaching behavior of vanadium from the VTM was similar to that of iron, and it was affected by the concentration of sulfuric acid and temperature. Further, titanium could be leached in the form of TiOSO₄ at a temperature higher than 75℃. To improve the leaching efficiency of V, Fe, and Ti in VTM, reductive sulfuric acid and oxidative sulfuric acid leaching were performed. When Na₂SO₃ was used as a reducing agent, the leaching rate of vanadium was 80% of that in that case of leaching by sulfuric acid. Similarly, the leaching rate of titanium increased from 20% to 50%. When Na₂S₂O₈ was used as an oxidation agent, most of the vanadium was leached, and the main residue found by XRD analysis was ilmenite. In studies on the possibility of recovering valuable metals, the selective extraction of metals is hardly achieved by solvent extraction from oxidation leaching solutions; however, in this study, Cyanex 923, a solvation extractant from reductive leaching solutions, could selectively extract Ti.

• Journal of Digital Convergence
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• v.12 no.12
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• pp.37-47
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• 2014

The characteristics of the spectrum, which are necessary for mobile telecommunication services, may determine the advantage of operators' competition for mobile services. We have a focus on the possibility that there would be the core spectrum within the frequencies. We define the core spectrum of frequencies in terms of 4 criteria (global source/roaming, cost-effectiveness, the experience of utilization and the possibility of use). They are based on the aspects of applicative and economic effectiveness by not technological and but market conditions. We have explored the current core spectrum by using the stepwise selection from these criteria. Our result indicates that the core spectrum may be movable with the development of technology and the flow of time. The results of this paper could be practically used as the reasonable justifications of the policies for not only the competition management but also the alignment about the frequencies for mobile telecommunication.

• The Journal of the Korea Contents Association
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• v.8 no.4
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• pp.137-146
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• 2008

The establishment of differentiated place image is becoming more important as a cultural tourism development policy in order to secure regional identity and boost regional economy. Place marketing strategies using culturally and historically differentiated regional places is very valuable as part of a regional development strategy to strengthen regional competitiveness. To construct place image as a differentiated brand, place image positioning suitable for a specific place and region needs to be established and comprehensive marketing strategies are required to generate various synergy effects. Based on existing theories and discussions regarding place and place marketing, this study is aimed at seeking for possibility as a cultural activity space and its more efficient use plans by selecting a region which has historical and cultural backgrounds and assets about Hamel's drift and stay. For these purposes, this study investigated historical and cultural backgrounds through a case study and made suggestions about brand making and place image promotion. In addition, this study aimed to examine efficient plans and utilization possibility for comprehensive image construction.

• The Journal of the Korea Contents Association
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• v.12 no.7
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• pp.295-305
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• 2012

This study analyzes actual conditions of private health insurance empirically by using the decision to join Korea Health Panel data. First, the study investigates how sociodemographic factors influence joining the private health insurance. Next, the relationship between the private health insurance membership and the frequency of medical service utilization is analyzed. The main results of these analyses can be summarized as follows: the socially vulnerable are less likely to join private health insurance relative to the middle and upper classes. The frequency of medical service utilization of private insurance members is relatively higher. This fact contains the possibility that the middle and upper classes are able to receive more medical services through private health insurance membership, while the socially vulnerable have difficulty with obtaining medical services in spite of much need. Therefore, policies are needed which manage the private health insurance more effectively and secure the publicity of health service socially.

• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.2
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• pp.165-171
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• 2014

This study aims to examine whether Marine sand mining business is Maritime Traffic Safety Audit and priority between Maritime Traffic Safety Audit and Sea Area Utilization Impact Assessment because development and action to use in the ocean is ambiguous, it is overlapped with system of environmental aspect, and priority is not designated. Therefore, the way to improve to settle the overlapping problem etc. between Maritime traffic Safety Audit and Sea Area Utilization Impact Assessment was suggested and legal ground for sand mining is suggested. Because management department for Maritime Safety Act and Marine Environment Management Act is Ministry of Oceans and Fisheries, the solution for this is both embodying co-experts on each committee for determinant of system with maintaining contact and radical revise of law. If revised, the possibility of accident in ocean is decreased, and it can be a way to protect marine environment.

• Research in Community and Public Health Nursing
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• v.12 no.3
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• pp.582-588
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• 2001

Purpose : This study is to examine the characteristics of the elderly and their family caregivers. to study the main factors affecting Nursing Home utilization, and to help frame a policy about Nursing Home's demand. management and welfare facilities. Method: Data for this present study were collected via questionnaires randomly distributed to family caregivers of the over 60-year-old patients at general hospital and university hospital in Seoul. Kyung-Ki Do and In-Chon from 26 June to 20 July, 2000. Questionnaires were issued to 512 people and 479 were returned. The data was analyzed by frequency, $x^2$-test, t-test, ANOVA. factor analysis. correlation coefficients analysis and Stepwise multiple regression analysis using SPSS 9.0. Result First. Instrumental Activities of Daily Living(IADL), duration of hospitalization, sex, marital status, behavior problems, home ownership, and cognitive disorder about elderly patients affect family caregivers burden. one of need factors. Secondly, marital status. religion. health status, sex, education and age in the family caregiver predisposing factors are main factors on Nursing Home utilization. Third, in need factors, care burden. time burden, family relation burden, physical burden and mental burden have an effect on Nursing Home utilization. Finally, the model the most important factors that affect Nursing Home utilization is composed of six of eleven totally, care burden, religion, time burden, health status, marital status and education. When the family caregivers get care burden and time burden. are highly educated, have no religion, have health problems, and have no spouse, it is possibility for them to utilize Nursing Homes. Conclusion: The government should decrease a family caregivers burden and seek to find how to support Nursing Homes. Furthermore. Social support program for the family caregivers should be required. Thus, the family caregivers need consultation and need to meet to talk about their patients. how to care them, get information, which are the crucial field in advancing the research in nursing science.

• Korean Security Journal
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• no.16
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• pp.283-304
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• 2008

The development of IT technology help citizens demand information and public services through internet that they want, and the changes also help the government converge public opinions and become important measures for citizens to participate in deciding governmental policies. So, this thesis makes an overture of a possibility for utilizing PCRM, a way for citizens to participate in Police Administration, by utilizing IT technologies in which everybody can participate without difficulty. The utilization ways are, on a large scale, classified with a macroscopic aspect and microscopic aspect. One of the macroscopic aspects is, first, the consideration of access to services and convenience in utilization. Second, services should have a both-sidedproperty. Ultimately, citizens'participation should have a positive mutual participation level. One of the microscopic aspects is, first, that the police organizations have to establish a strategy to analyze and fractionate customers. Second, the police organizations have to make an effort to develop policy services and P.R strategies. Third, police organizations have to make an effort to manage customers. Fourth, police organizations have to execute customer management in general. So, all of the police organizations have to maintain unity, to some extent, about citizen participation plazas. In addition, at the same time, consciousness aspects have to be accompanied for the reasonable utilization of PCRM. Citizens have to cultivate citizen consciousness, ownership consciousness for society, and positive participation consciousness to solve social problems.

• Korean Journal of Social Welfare Studies
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• v.40 no.3
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• pp.213-242
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• 2009

This study examined the factors affecting social welfare service utilization of general group and low-income group. The following influencing variables were selected based on the model developed by Anderson and Newman(1973): predisposing factors, enabling factors, need factors. The result shows that in both group the possibility of service utilization is high in case of having a spouse, more family members, feeling one's health ill, no chronic disease. And service use level is high in case of having no spouse, lower income in general group, higher income in low-income group, more family members, feeling one's health ill, having a chronic disease. In addition, the higher service use level is associated in low-income group with men rather than women, younger age, low education, the unemployed rather than the employed, urban residents, low life satisfaction. These findings provide implications and suggestions that each income group has various characteristics and needs, so it is necessary to provide comprehensive and appropriate services through the investigation for potential service recipients' needs.

• Korean Journal of Social Welfare Studies
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• v.41 no.4
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• pp.135-160
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• 2010

This study was designed to analyze, by using a hierarchical logistic regression analysis method, how difficulties in business start-ups and personal characteristics independently determine the utilization of micro-enterprise support services. The services were categorized into eight areas: capital, technical service, psychological service, item feasibility and business plan, site selection and interior service, marketing, finance and accounting, employment service. This study found that difficulties in business start-ups were a significant factor in six areas. Personal characteristics were a significant factor in four areas, when difficulties in start-ups were controlled. Among the personal characteristics, higher possibility of service utilization was anticipated in people with start-ups experience than people without experience, and in women than men. This results point out that service strategies should be targeted for people with difficulties in order to improve the accessibility of micro-enterprises support services. The results also indicate that the strategies should be considered for people with no start-ups experience, low academic ability, and female entrepreneurs who are vulnerable.