• Journal of the Korean Chemical Society
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• v.50 no.5
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• pp.394-403
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• 2006

purpose of this study was to analyze high school chemistry teachers perception of the Chemistry I & Chemistry II in the 7th national curriculum and their demands on the revision of curriculum. A nationwide survey was administered to obtain the responses from 108 high school chemistry teachers. More than half of the participants thought the current curriculum of Chemistry I and Chemistry II needed revising. As the results, a major drawback of Chemistry I was a difficulty in explaining phenomena due to absence of basic concepts, and that of Chemistry II was an excess of the contents for high school science courses. Unfortunately, it was found out that inquiry activities existed only in name, especially in case of Chemistry II. Regarding the manner of content organization of Chemistry I in new curriculum, demand on a concept-based approach outnumbered theme-based approach. For revising Chemistry, the majority of participants demanded basic chemistry concepts to be introduced, without supplementation of quantitative approaches and deepening level of concepts. An urgent request for Chemistry II was reducing content by shifting relevant concepts to Chemistry I. Implications for high school chemistry education including revising curriculum were discussed.

• Journal of Bio-Environment Control
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• v.20 no.3
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• pp.197-203
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• 2011

This experiment was carried out to investigate the growth characteristics of virus-free sweetpotato in hydroponic bag culture. The rooted one-node and upper-shoot cuttings of 'Yeonhwangmi' and 'Mannamiwere' transplanted into the plastic bag (0.5 mm of thickness, $W300{\times}L1,200{\times}H120mm$) culture system filled with commercial horticultural media (TKS-2, Flora Gard Co.) and cocopeat + perlite (3 : 7, 5 : 5, 7 : 3, (v/v). Nutrient solution of National Horticultural Research Station in Japan was separately irrigated $3times{\times}30minutes$ per day (10:00, 14:00 and 20:00 with timer control) by the drip irrigation. The growth of two varieties was not significantly different among four substrates in 15 days, but it was excellent in commercial horticultural media (TKS-2) and cocopeat 3 : perlite 7 (v/v) in 20 days. The growth in 'Yeonhwangmiwas' promoted than that in 'Mannami', and the upper-shoot cuttings of 'Yeonhwangmi' and 'Mannami' showed a significant vine elongation (over 10 and 2 cm, respectively) compared to the one-node cuttings. Fresh weight and dry weight in cocopeat 3 : perlite 7 (v/v) were significant increased than that in cocopeat 7 : perlite 3 (v/v). Therefore, the bag culture system filed with cocopeat 3 : perlite 7 (v/v) was successfully applied on propagation of virus-free sweetpotato seedling, and the result expected that the bag culture system could be commercialized without high financial costs for farmers.

• Journal of Animal Environmental Science
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• v.12 no.1
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• pp.1-6
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• 2006

본 연구는 지속 가능한 친환경 축산업의 직접지불제를 도입하는데 농가이행 프로그램 개발과 시범사업의 효과를 분석하기 위하여 전국단위 4대 축종(한우, 젖소, 돼지, 닭)에 대한 2003년도에는 프로그램 개발과 2004년$\sim$2005년(2년간) 시범사업 시행 효과를 분석하기 위하여 각 시 군에 참여한 농가의 현황과 담당 공무원 및 농가에 대한 의향조사를 실시한 결과는 다음과 같다. 1. 기본프로그램(2003년)으로 소(한육우 젖소)는 조사료포 확보 및 분뇨 경지환원, 돼지 닭(산란계 육계)는 사육밀도 완화 및 분뇨발생량 감축을 위하여 발생되는 경지확보 비용 그리고 사육밀도 완화에 따른 감소두수의 소득감소분을 농가부담 50%로 설정하였다. 인센티브 프로그램으로 축사 및 분뇨처리시설 주변에 악취, 조경 등 환경개선을 위하여 조경수를 구입 식재하면 비용의 50%를 직불하도록 하였다. 2. 시범사업 참여실적은 2004년에 459호에 비하여 2005년에 653호로 42.3% 증가하였으며 참여비율은 한우 24.4%, 젖소 17.4%, 돼지 40.2%, 닭 18.0% 이었으며 친환경축산 직불금 지급액 비율 한우 16.1%, 젖소 22.0%, 돼지 46.4%, 닭 15.5% 이었으며 농가당 지급액은 한우 3,987천원, 젖소 7,627천원, 돼지 6,965천원, 닭 5,212천원이었고, 인센티브(조경수 식재) 참여는 전체농가 중 20.4%, 호당지급액 1,303천원(4.6%) 이었다. 3. 조사료포 확보 실적은 한우 $1,303m^2$/두('04)에 비하여 $1,639m^2$/두('05)로 26% 증가하였고, 젖소 $1,517m^2$/두('04)에 비하여 $1,561m^2$/두('05)로 3% 증가하였다. 4. 돼지 닭의 사육밀도는 돼지 $1.14m^2$/두('04)에 비하여 $1.27m^2$/두('05)로 11% 넓어졌으며 산란계는 $0.059m^2$/수('04)에 비하여 $0.083m^2$/수('05)로 41% 넓어졌고 육계는 $0.078m^2$/수('04)에 비하여 $0.069m^2$/수('05)로 12% 좁아졌다. 5. 축산환경개선사업에 대한 설문조사 결과 환경개선제 사용이 악취 및 파리 감소에 효과가 크며 지원사업을 계속해야 한다고 답하였다.

• Korean Security Journal
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• no.41
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• pp.7-36
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• 2014

Recently the Korean government announced that minimum wage policy would be applied even to apartment security staffs by 2015 who had been waived from the policy enforcement for their unique work conditions. This caused apartment management to introduce unmanned security system instead of employing security staffs because of fearing possible hike of management fees. People recklessly tend to believe unmaned system is cheaper than maned system if minimum wage guideline is applied. This study examines the economic feasibility of two different apartment security systems by utilizing cost-benefit analysis: maned and unmaned security systems. The authors estimate the costs and the benefits of each security system for 5 years(2014-2018) with application of social discount rate(5.5%). Thirty six apartment complexes at 8 different areas(meons and dongs) in Asan, Chungcheongnam-do province were surveyed. And to attain the exact costs of unmaned system establishment and operation, the authors interviewed persons working for the unmaned security corporations. The benefit-cost(B/C) ratio for unmanned security system is 1.66% at minimum and 1.30% at maximum. while B/C ratio for manned security system is 1.42% and 1.66% respectively. This results mean that people's belief is not correct, that is, transferring from maned system to unmaned is not always economically efficient. Benefits of maned security system is more diverse than unmaned system. The former provides living conveniences(parking helps and keeping parcels) and social benefits(employing aged worker and giving them opportunities to enjoy happier lives) as well as security benefits like crime prevention. The latter provides security benefits only, but that effect is also doubtable. Taking into account these diverse benefits maned system provides, the B/C ratio of maned system is equitable or higher than unmaned system.

• The Journal of the Korea Contents Association
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• v.18 no.8
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• pp.51-61
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• 2018

This study was conducted to propose regional policy for reducing suicide rate by confirming the change of local suicide rate for 10 years from 2005 to 2015 and the effect of change of local environmental factors influencing the change. The main results are as follows. First, the change of city, county, and province suicide rate in 10 years showed that the suicide rate decreased in order of military district, city area, and district. Second, in the case of economic factors, local suicide rate decreased as the local tax burden per capita increased, and as the financial self - reliance increased. Third, in the case of the social integration factors, the local suicide rate decreased as the ratio of the basic livelihood recipient decreased. In addition, local suicide rate decreased as the number of elderly leisure welfare facilities increased. Fourth, in the case of the social demolition factor, the region where the divorce rate is increased, the depression experience rate is increased, and the region where the rate of one person is increasing, the local suicide rate is increased. Therefore, it is expected that the local suicide rate can be reduced through efforts to improve the economic capacity of the whole region, social integration and reduction of the social disintegration phenomenon in the region.

• Journal of the Korea Convergence Society
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• v.9 no.7
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• pp.95-103
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• 2018

The purpose of this study was to awareness of dental care services in the elderly long-term care insurance system and retirement preparation of middle-aged people. The survey respondents had a 56.1% saving for old age life, And showed a tendency to they don't like depend on one's family(41.8%), elderly care was intended to use facility services and nursing care. 36.7% of respondents answered "I know a little" about the system. Also, the need for dental care services within the system was high (98.5%), If the service is provided, 92.3% of the respondents said that they would participate, otherwise unrecognized rate of dental care services in long-term care insurance was 85.2%. Therefore, it is necessary to expand the awareness of the part of dental care service in the system. The results of this study can be used as basic data for the improvement of the system of dental care services in long-term care insurance for elderly.

• Journal of the Korean Society of Food Science and Nutrition
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• v.34 no.9
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• pp.1407-1413
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• 2005

Korean households' expenditures on the eating -out have been steadily increasing except for the foreign exchange crisis period. This paper aimed to examine the eating-out expenditures of salary and wage earners's households by educational attainment of household head. We modeled the demand function of eating-out in terms of income and price, examining the responsiveness of eating-out demand to changes in income and price using econometric methods such as regression, rolling regression and impulse response. This paper showed that coefficients of income and price tended to decrease as the income rises in the long-run. Specifically, the higher the educational attainment of household head is, the smaller the coefficients of income and price we. The impulse response analysis also indicated that while price shocks decreased the demand for eating-out, income shocks tended to increase tile demand for eating-out in all the educational attainments. Furthermore income shocks were much greater and last longer than price shocks at all educational attainments of household heads.

• Journal of Oral Medicine and Pain
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• v.33 no.4
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• pp.353-374
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• 2008

The descriptive epidemiology of specific neuropathic pain disorders has not been well-des-cribed, although the burden of neuropathic pain is well recognized. The true incidence of neuro-pathic pain disorder is unknown, but it is believed to be under diagnosed and treated inade-quately, despite the development of various diagnostic system. The purpose of this study was to report the epidemiology of specific neuropathic pain as managed by all kinds of hospital in Korea. A descriptive analysis of the epidemiology of prevalent trigeminal neuralgia(TN)(n-=77,053 27,6%), atypical facial pain(AFP)(n=12,382 4.4%), glossopharyngeal neuralgia(GN)-(n=1,319 0.5%), post-herpetic neuralgia(PHN)-(n=84,598 30.3%), diabetic neuropathy(DN)-(n=85,989 30.8%), atypical odontalgia(AO)-(n=16,001 5.7%) and glossodynia(GD)(n=2,133 0.8%) and treatment departments and treatment durations from computerized Health Insurance Review and Assessment Service(HIRA) of Korea: January 2003 to December 2005, are reported with rates increasing over time for PHN and DN and decreasing for the other neuropathic pain disorders. Most patients were treated at private clinic record for 57.6-72.8% of patients except OA for 10.3%. The percentage of Dept of dentistry for outpatients was 3.2% for TN, 34.7% for AO and 15.4% for GD. Other neuropathic pain patients visited nearly medical clinic.

• Korean journal of communication and information
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• v.29
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• pp.111-145
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• 2005

In this study, the problems In the current HDTV programming strategies were critically inquired into and reform measures were sought through in-depth interview with HDTV programming staff and program directors of the three major terrestrial broadcasting systems that are in their fourth year of HDTV broadcasting, and through analysis of the characteristics of HDTV programming. The analysis of this study showed that the time allocated to HDTV programs far exceeded the thirteen hours per week set by the Korean Broadcasting Commission. However, the percentage of HDTV programs broadcasted during the prime time was low, which as a result, limited the opportunity for the audiences to experience HDTV. furthermore, the low percentage of programs such as documentaries, sports, movies, etc. that are preferred by early adopters and through which the features of HDTV including high quality of picture, wide screen, etc. can be fully applied and shown did not appear to help in accelerating the popularization of HDTV In order to improve these problems, despite their having to bear the initial production costs, the broadcasting systems must come up with an aggressive strategies for the programming of documentaries, sports programs and dramas in order to strengthen the competitiveness in HDTV production and secure future adopters, and together with this, full support from the policy planning authorities and companies manufacturing electric home appliances, the other leaders in DTTB(Digital Terrestrial Television Broadcasting) transition, are necessary in order to promote the production of HD contents.

• Journal of the Korea Society for Simulation
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• v.24 no.1
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• pp.35-43
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• 2015

This research proposed a new method to evaluate the objective validity to launch smart transportation services that various stakeholders are complicatedly inter-connected. First of all, we have designed the fundamental business model to form the smart transportation services and defined the stakeholders taking part in the services. Also, the criteria to evaluate the economical validity has been proposed based on the relationship among stakeholders. Especially, in the case EV drivers and charging service providers, the economical validity depends on the scale of spreading. Therefore, we have compared the two extreme scenarios, the poor and stable level of EV spreading. According to the result, it may be said that EV drivers and charging service providers cannot be guaranteed the economical validity due to the burden of initial investment. On the contrary to this, suppliers of EV and charging gears may secure more than a certain level of profit. In addition, the government may have great profit due to reducing the CO2 emission and cost for importing energy sources. Therefore, it is needed to enhance the level of supporting EV drivers and charging service providers at the first stage. Also, the impact of the ratio of EV and charging service stations on the economical validity of smart transportation should be further investigated.