• The Korean Journal of Petroleum Geology
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• v.6 no.1_2 s.7
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• pp.37-43
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• 1998

Chemical components of water, chemical and isotopic compositions of extractable gases were analyzed to characterize the properties of the natural gases which are dissolved in ground water in the Pohang area. Amount of total extracted gases ranges from 27 ml/l to 50.1 ml/l. Hydrocarbon gases are composed of methane ($27{\~}376,420 ppm$) and ethane ($19{\~}127 ppm$). Amount of total hydrocarbon gases is related to the lithology and geological factors around the reservoir. Quantity of hydrocarbon gases tends to increase in the Tertiary reservoirs and in the reservoirs where the Tertiary formations are thick enough. According to the relationship between hydrocarbon gases and total solids in the ground water, it is believed that the hydrocarbon gases were dissolved in the Tertiary formation water. Based on the methane content ($>99.9\%$) and isotopic composition (${\delta}C^{13};-73.1\%_{\circ}{\~}-43.22\%_{\circ}$), we interpret the gases to be of predominantly biogenic origin which were generated by the methanogenic bacterial processes under the low temperature and anoxic conditions.

• Journal of the Korean Society for Precision Engineering
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• v.4 no.2
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• pp.17-19
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• 1987

지난해 우리나라 경제는 안정속에 고도성장과 국제수지 흑자를 기록한 값진 보람을 느낀 한 해였다. 그러나 이같은 흑자기조는 개개기업의 성장잠재력에서 찾아볼 수도 있겠으나 대부분이 3저요인을 배경으로한 수출환경의 변화에 힘입은 바 크다. 그럼으로 언제 무산될지 모르는 장래를 낙관만 할 수는 없다. 지금의 현상을 어떻게 보는가에 대하여는 각계각층이 보는 시각에 따라 견해가 달라지겠으나 분명한 것은 국제유가나 국제이자가 오름세를 보이기 시작했다는 사실과 우리에게 국제경상수지흑자시대를 열어준 3저호재는 확실히 변해가고 있다는 것이다. 이렇게 볼 때 우리나라 경제는 해외요인변화에 매우 예민함으로 지금, 흑자기조가 정착되었다고 속단하기에는 너무 이른것 같다. 적어도 흑자기조가 정착되려면 모든 산업간, 계층간, 지역간의 불균형이 시정되고 기존의 산업기반을 내실화하는 단계에 있을 때 비로서 흑자경제의 향배가 가름하게 되는 것이다. 최근에 일어나고 있는 원화의 지속적인 평가절하, 엔화강세에 따른 원자재가격폭등은 우리에게 적지않은 위협을 주고있다. 이같은 상황에서 정부는 올해 국제수지흑자의 적정선유지를 위해 대미구매사절단의 파견, 수입선의 다변화, 수출지원정책의 감소등 다각적인 정책을 선택하고 있는 것으로써 일응 올바른 판단으로 수긍하나 다만 업종에 따른 특성에 배려가 있었으면 한다. 특히 우리나라의 기계공업은 20년의 짧은 근대화건설 과정에서 그나마 지금의 수준과 규모의 기반을 닦아왔다. 그러나 아직도 기술면에서 많은 취약점을 지니고 있어 대부분의 기초소재와 핵심부품이 해외에서 수입되고 있는 실정이다. 따라서 기계공업이 명실공히 선도산업으로써 의 위치를 굳히기 위해서는 적어도 기계류의 수입국에서 수출국으로의 탈바꿈을 할 때 비로소 성취될 것이며, 이 때가 관련산업간의 불균형이 시정된 흑자시대라고 보는 것이 옳을 것 같다. 작금의 주변환경은 서두에서 언급한 3저호재에 심상치 않는 조짐이 보이고 있다. 이같은 주변환경에 관점을 두고 지금 우리가 당면하고 있는 과제 중의 하나인 원화절상을 지적하지 않을 수 없다. 이같은 원화절상내용을 중심으로 부가적으로 수반된 몇가지의 현안문제와 함께 점검해 보기로한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.494-494
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• 2017

국내의 호소는 대부분이 농업용수 공급을 목적으로 설치된 인공 호소이다. 최근 이상기후 및 유역 오염원 증가로 호소의 수질오염도가 증가 추이에 있으며, 특히 하절기 외기온도 상승과 함께 녹조 대량발생, 어류 집단폐사 등 수질오염사고가 야기되고 있다. 이러한 수질오염사고는 호소의 지역적 특성으로 인한 여러 가지 원인이 있겠지만 직접적인 원인으로는 호소의 산소 고갈에 기인된다. 본 연구에서는 농업용 호소의 수온, DO, EC 등에 대한 일주기 및 계절적 동적변화를 규명하여 호소의 수질개선대책수립에 활용하고자 하였다. 연구대상 지구는 경기도 시흥시에 소재하고 있는 M 농업용 저수지이며, 2015년 6월 4일부터 9월 22일까지 수온, DO, EC을 측정할 수 있는 연속 자동측정장치를 설치하였고, 측정지점은 저수지 수심을 상(바닥층에서 1.5m 상부), 중(바닥층에서 1.0m 상부), 하(바닥층에서 0.5m 상부)로 구분하여 각각 측정하였다. 호소의 수온은 일주기로 수온성층 형성과 대류혼합이 반복되었으며, 상 하층간의 수온 차이가 평균 $1.4^{\circ}C$, 최대 $5.0^{\circ}C$의 차이를 보였다. 또한 강우가 발생한 이후에는 일시적으로 저수지 상 하 층간 수온 차이가 거의 없는 것으로 나타났는데, 이는 강우에 의한 수체의 수직혼합으로 저수지 전체의 물질순환에 영향을 미친 것으로 판단된다. 호내 DO 농도는 일(day) 주기 동안 농도변화가 크게 나타났으며, 여름철 무강우 기간에는 저수지 바닥층의 평균 DO 농도가 약 0.5mg/L로 거의 무산소 상태가 지속되는 것으로 관측되었다. DO는 기온이 낮아지거나 강수가 발생할 때 대류에 의한 수직혼합에 의해 간헐적으로 회복되다가 다시 고갈되는 현상이 반복되는 것으로 나타났다.

• Journal of agricultural medicine and community health
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• v.34 no.3
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• pp.359-367
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• 2009

Objectives: This study was to identify the changes of body fat, blood pressure, blood glucose and serum lipid of middle and old aged women after participation in exercise program which includes aerobic(dance sports) and anaerobic(dumbbell gymnastics) exercises. Methods: One hundred women aged from 55 to 72 were surveyed before and after an exercise program. The exercise program was provided to the subjects performed during 6 months from July, 2007 to December, 2007 at a public health subcenter in Gumi City. Questionnaire survey for general characteristics, anthropometric measurement and blood test were taken before starting the program and anthropometric measurement and blood test after completing the program. Results: Body Weight, body fat and blood pressure showed significant change after the exercise program(p<0.05). Additionally in total glucose, total cholesterol and triglyceride significant change was observed(p>0.05). Waite circumference decreased, however did not show statistically significant difference. Conclusions: It was effective to participate in dance sports and dumbbell gymnastics exercise regularly. All of the positive changes through the study showed that there should be the program for middle and old aged women to exercise actively and also the middle and old aged women need have a active exercise habits as regular as possible. Additional studies confirming the results of this study are needed to compare the effects of the dance sports and dumbbell gymnastics exercise on the other age groups.

• Korean Journal of Environment and Ecology
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• v.34 no.1
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• pp.63-71
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• 2020

This study characterized the spatial and seasonal patterns of light pollution in the Deogyusan National Park and examined the potential effects of light pollution on ecosystems in the park using light intensities derived from VIIRS (Visible Infrared Imaging Radiometer Suite) DNB (Day and Night Band) nightlight images collected in January and August 2018. Results showed that the Muju Deogyusan resort had the greatest light intensity than other sources of light pollution in the park, and light intensity of the resort was much higher in January than in August, suggesting that artificial lights in ski slopes and facilities were the major source of light pollution in the park. An analysis of an urban-natural light pollution gradient along a neighboring urban area through the inside of the park indicated that light radiated from a light pollution source permeated for up to 1km into the adjacent area and contaminated the edge area of the park. Of the legally protected species whose distributions were reported in literature, four mammals (Martes flavigula, Mustela nivalis, Prionailurus bengalensis, Pteromys volans aluco), two birds (Falco subbuteo, Falco tinnunculus), and nine amphibians and reptiles (Onychodactylus koreanus, Hynobius leechii, Karsenia koreana, Rana dybowskii, Rana huanrenensis, Elaphe dione, Rhabdophis tigrinus, Gloydius ussuriensis, Gloydius saxatilis) inhabited light-polluted areas. Of those species inhabiting light-polluted areas, nocturnal species, such as Prionailurus bengalensis and Pteromys volans aluco, in particular, were vulnerable to light pollution. These results implied that protecting ecosystems from light pollution in national parks requires managing nighttime light in the parks and surrounding areas and making a plan to manage nighttime light pollution by taking into account ecological characteristics of wild animals in the parks.

• Journal of the Korean Applied Science and Technology
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• v.37 no.4
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• pp.848-859
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• 2020

This study selected 42 domestic preceded literatures that applied exercise programs to the elderly for the past 10 years from 2010 to the first half of 2020 to analyze the characteristics of preceded research, applied period of exercise programs, configuration of exercise programs, and effectiveness of exercise programs on elderly depression, and the conclusion is as follows. First, the majority of the subjects were female and male/female elderly people in the preceding literature, and it appeared that there were no male subjects alone for any of the studies showed. The majority of the ages were over 65 years old, and the number of subjects was 50 or less. In the group, preceded research with exercise/control groups was mostly predominant, and the participated institutions and regions accounted for the majority of the residential area/public institutions and sanatorium. Second, the period of the exercise program was mostly applied for more than 12 weeks, and the frequency of exercise per week was 1-2 times and 3-4 times. Most of the preceding literature was applied with a 60-minute exercise program during the one-time exercise period. Third, most of the contents of the exercise program consisted of a aerobic exercise alone and combination of aerobic·anaerobic exercise. Fourth, it was confirmed that the effects of exercise programs were effective in physical fitness factors as well as in depression and cognitive function.

• Journal of Korean Society of Forest Science
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• v.76 no.1
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• pp.17-26
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• 1987

To develop the rehabilitation measures for rockily denuded forest lands which are widely distributed in Seoul metropolitan area, erosional characteristics of denudation should, first of all, be evaluated and analysed. As a fundamental study for developing such technical measures, the rockily denuded lands were classified into 6 types according to denudation features of the mountain land, and also movements of stone debris-and-sand on rock-exposed hillslopes were measured and analysed. The 6 basic types of denudation features include a) natural rock-outcrop-exposed land, b) stone debris-and-sand scattered land, c) stone debris-and-sand deposited land, d) coarse sand producing bare land susceptible to weathering and erosion, e) dwarfed pine growing land, and f) torrential valley susceptible to the debris slides. In the stone debris-and-sand scattered hillslopes (type b), average amount of moved-down debris reached to about 3.9 ton/ha/yr due to surface washing and slidings. In the particle size distribution of the moved-down debris, it amounts to about 25% of 10-25mm, about 15% of 5-10mm, about 24% of 2-5mm, and about 36% of less than 2mm in diameter class, respectively. The detailed experimental studies should be accomplished further more about the denudation processes including weathering, erosion and debris slides on rock-exposed hillslopes.

• Korean Journal of Community Nutrition
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• v.7 no.2
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• pp.257-265
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• 2002

This study was performed to investigate the effect of kimchi intake on free radical and oxidative substance production in young adults and the elderly. Daily kimchi intake by people in their twenties (n = 93, 20 to 29 years old) and over sixty-five (n = 143, over 65 years old) in M city were surveyed and blood was drawn to analyze the free radicals in their plasma. The average amount of kimchi intake by the subjects was 115.8 $\pm$ 91.7 g. The amount of kimchi intake of those in their twenties (106.1 $\pm$ 80.6 g) was significantly lower than that of those over sixty-five (125.5 $\pm$ 102.9 g, p < 0.05). Concentrations of total free radicals and OH radicals were 27 and 33% greater respectively, in those over sixty-five than in those in their twenties, indicating that more free radicals were produced by the older group. The concentration of GSH was not signiacantly different in the two groups, but that of GSSG in the over sixty-five age group was 53% greater than in the twenties group, which resulted in a 35% reduction in GSH/GSSG in the elderly group. TBARS concentration in the over sixty-five group was 26% greater than that of the twenties group. In order to see the effect of kimchi intake on free radical production, subjects in same age group were divided into two sub groups-the mean over and the mean under groups-according to the average amount of kimchi intake, which was 115.8 g. The total free radicals, the OH radicals, the GSH, the GSSG, and the GSH/GSSG in the twenties group were not significantly different in the two kimchi intake groups. However, those in the over sixty-five group were significantly different. The concentration of total free radicals and OH radicals of the mean over group were 21 and 26% lower respectively, than those of the mean ova. group (p < 0.05). The GSH and GSH/GSSG of the mean ova. groups were higher by 8 and 12%, respectively. The correlation coefficient between the kimchi intake and the total free radicals was -0.1862 (p < 0.05) and that for GSH/GSSG was 0.1861 (p < 0.05). In conclusion, the production of free radicals and oxidative substances increased with age, and kimchi seemed to retard this phenomena.

• The Journal of the Korea Contents Association
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• v.18 no.12
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• pp.456-467
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• 2018

This study analyzed the repeated causes of policy failure focusing on Yangyang International Airport cases. Yangyang International Airport, which opened in 2002, was built with about 360 billion won, but it is considered as a representative example of policy failure of local airports. According to the policy failure theory, the failure factors of Yangyang International Airport are anlyzed by rationalistic, political, and environmental complexity viewpoint. The results are as follows. First, from a rationalist point of view, Yangyang Airport failed to achieve the policy goal of securing passengers and revitalizing local economy, This is due to the pressure of politics and the lack of geographical infrastructure. Second, the failure of the stakeholders to resolve conflicts in the flow of politics can be seen as the conflict between the airline and the airport, and the failure to reconcile conflicts between the government and the airports on the low cost airline permits and subsidies. Third, from the viewpoint of environmental complexity, Yangyang International Airport can be regarded as a failure to adapt to environmental changes such as the opening of nearby expressways and railway lines, and the sharp decline of Chinese tourists. This study sugeests the establishment of an independent organization that can prevent unreasonable business promotion by politics in the case of large scale national projects, the linkage with the surrounding infrastructure and related businesses in the case of transportation facilities such as airports and railways, and institutionalization of cooperative governance for coordinating conflict among stakeholders.

• Journal of Wetlands Research
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• v.23 no.2
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• pp.183-188
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• 2021

In the case of small-scale sewage treatment plants, it is reported that the amount of inflow fluctuates and it is difficult to operate the sewage treatment due to the inflow of unknown water due to the aging of sewage pipes. In particular, there are many overall operational problems due to the decrease in water temperature in winter. In this study, the operation status of small-scale sewage treatment facilities located in mountainous areas and water quality changes according to temperature were analyzed. It was found that the concentration of BOD, COD, and SS in effluent water was greatly changed depending on the temperature, and it was found that COD was particularly affected. Accordingly, the water level of the bioreactor was raised by 0.4m in order to temporarily apply measures to lower the water temperature in winter. As a result of comparing and analyzing the results when the bioreactor was covered and operated, a significant improvement effect occurred. In addition, a plan to improve the treatment efficiency of the bioreactor in winter is to extend the residence time of the bioreactor, a plan to expand the bioreactor specification, a new flow control tank and transport it to the outside, and an oxygen-free air diffuser to be used as an aerobic tank in case of an emergency in winter. The improvement plan was suggested. The results of this study are expected to be used as basic data for the operation plan of small-scale sewage treatment facilities in winter.