• Proceedings of the KGS Conference
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• 2003.05a
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• pp.65-68
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• 2003

우리나라 동해안의 해성단구 연구에 있어서 1990년대의 중반까지는 Kim, S. W.(1973)의 봉화재면(구정선 고도 130m)을 제외하고는, 주로 구정선 고도 80m~90m 이하의 해성단구면을 대상으로 연구가 진행되어 왔다(오, 1977; 조, 1978; Oh, 1981; Lee, 1987; Kim, J. Y., 1990; 최, 1995a, 1995b, 1996; 최, 1997; 김 외, 1998). 그러나 1990년대의 후기 이후에는 loom 이상의 구정선 고도를 갖는 해성단구에 대한 보고가 윤 외(1999), 황상일 외(2000), 윤 황(2000) 등에 의하여 이루어져 왔다. (중략)

• The Korean Journal of Quaternary Research
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• v.19 no.1
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• pp.27-40
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• 2005

Researches onmarine terrace in Korea have been drastically progressed during the last two decades.main themes of researches include vertical and horizontal distribution of paleo-shoreline, sedimentary facies ofmarine terrace deposits, OSL dating of terrace deposits and estimation of uplift rate. At present, it is noted thatmarine terraces distributed at the same altitude do not always show the same sedimentary facies, nor have the same ages.marine terraces are generally divided into five terrace systems, of which ages increase in ascending order. There are some arguments about discrimination between 2nd and 3rd terrace systems and their age. The core discrepancy lies on the question of whether the level of the last interglacial terrace is on the level of about 20m or on the 30~35m(~40m) in altitude. The uplift rate based on the paleoshoreline distribution ranges between 0.10 and 0.20m/ka.

• Journal of Wetlands Research
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• v.25 no.4
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• pp.221-229
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• 2023

Extracted from the metropolitan area, the Paldang Lake, which supplies approximately 8 million tons of water, has achieved a BOD (Biochemical Oxygen Demand) of 1.1 mg/L as a result of water quality preservation policies. However, concerning the COD (Chemical Oxygen Demand) component that encompasses refractory organic matter, there has been an observable upward trend in concentration. The introduction of refractory organic matter into the water source of Paldang Lake brings potential increments in BOD, generates off-putting tastes and odors in tap water, increases THM (Trihalomethane) formation, and triggers algae proliferation. Moreover, if residual hazardous refractory pollutants persist in aquatic environments, they may induce endocrine disruption and phenomena such as antibiotic resistance. In this study, a monitoring campaign was executed to discern the concentration of refractory organic matter emissions from point and non-point sources within Paldang Lake and its upstream region, with the aim of managing refractory organic matter in Paldang Lake. By comparing refractory organic matter emission concentrations across monitored areas, the elimination efficiency at wastewater treatment plants was assessed. Additionally, employing the Pearson correlation correlation analysis technique, correlations among refractory organic matter indices, antecedent wet days, and antecedent dry days were explored. The concentrations of refractory organic matter in rivers and Paldang Lake exhibited a similar pattern. Wastewater treatment plant effluents exhibited higher concentrations compared to rivers and Paldang Lake. The assessment of refractory organic matter removal at wastewater treatment plants indicated a removal efficiency of 65.73%. However, no significant correlation emerged between refractory organic matter emission concentration and antecedent wet days or priory antecedent dry days. This absence of correlation is attributed to data scarcity, underscoring the need for long-term monitoring and data accumulation.

• The Optical Journal
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• s.148
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• pp.41-43
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• 2013

광학 전문기업 해성옵틱스가 지난 11월 6일 한국거래소 코스닥시장에 상장됐다. 한국거래소 서울사옥 홍보관에서 열린 이날 기념식은 해성옵틱스 이을성 대표를 포함해 한국거래소 최홍식 부이사장, 코스닥협회 김원식 부회장, 우리투자증권 IB사업부 정영채 대표 등이 참석한 가운데 진행됐다.

• The Journal of Dong Guk Oriental Medicine
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• v.9
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• pp.111-125
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• 2000

Galwhahaejungtang has been used to alcoholic disease. Object of This study is examining the effect of Galwhahaejungtang and exercise on variation of total cholesterol, HDL-cholesterol, triglyceride, free fatty acid, BUN, Creatinine in rat with alcohol administration. METHODS AND MATERIALS Fifty four rats were divided into four groups. 1. The group of rat with alcohol administration and no treatment 2. The group of rat with alcohol and Galwhahaejungtang administration 3. The group of rat with alcohol administation and exercise 4. The group of rat with alcohol, Galwhahaejungtang administration and exercise Serum of rat were obtained after 2 weeks and 4 weeks. RESULTS 1. The level of total cholesterol was decreased in the group of rat with Galwhahaejungtang administration and exercise after 2 weeks. After 4 weeks, the level of total cholesterol was significantly decreased in the group of rat with Galwhahaejungtang administration and exercise. 2. The level of HDL-cholesterol was significantly increased in the group of rat with exercise after 2 weeks. After 4 weeks, the level of HDL-cholesterol was significantly increased in the group of rat with no treatment and with Galwhahaejungtang administration. 3. The level of try glyceride was significantly decreased in the group of rat with exercise after 2 weeks. After 4 weeks, the level of tryglyceride was significantly decreased in the group of rat with Galwhahaejungtang administration. 4. The level of free fatty acid was significantly decreased in the group of rat with Galwhahaejungtang administration after 2 weeks. After 4 weeks, the level of free fatty acid was significantly decreased in the group of rat with Galwhahaejungtang administration and with Galwhahaejungtang administration and exercise. 5. The level of BUN was significantly decreased in the group of rat with Galwhahaejungtang administration and exercise after 2 weeks. After 4 weeks, the level of BUN was significantly decreased in the group of rat with exercise. 6. The level of creatinine was significantly decreased in the group of rat with Galwhahaejungtang administration and exercise. After 4 weeks, the level of creatinine was significantly decreased in the group of rat with exercise and with Galwhahaejungtang administration and exercise. CONCLUSION Based on these results, it is considered that Galwhahaejungtang administration and exercise has an accelerating effect on alcohol metabolism.

• Geotechnical Engineering
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• v.11 no.3
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• pp.37-42
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• 1995

The laboratory hydraulic conducti vita tests with rigid wall permeameter were performed to study the effects of waste leachate on the permeability of a marine clay. The marine clay and waste leachate for this study were sampled from Kimpo Wastefills, and the hydraulic gradients applied to the clay specimens aTe relatively high from 37.5 to 225. The test results show that the permeability of a marine clay is increased with increasing the concentration of leachate and with decreasing the hydraulic gradient. And also both the liquid limit and the plasticity index of the marine clay miRed with waste leachate decrease with increasing the concentration of leachate.

• The Journal of Engineering Geology
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• v.12 no.4
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• pp.459-469
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• 2002

We have remolded marine clay sample collected along the vertical and horizontal directions and investigated the characteristics of the consolidation constants by SCT and CRSC methods. We have studied also on consolidation chracteristics and application for weathered granite soil using SCT and CRSC methods for undisturbed and disturbed samples. As the result, values of pre-consolidation stress, compression index, excessive pore pressure, pore water pressure ratio of the marine-clay were different due to different test methods(SCT and CRSC) and sampling directions(vortical and horizontal directions). Disturbed and undisturbed samples of the weathered granite soil have showed similar change aspect like marine clay during over-consolidatied and normally consolidatied stages.

• Clean Technology
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• v.4 no.2
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• pp.54-60
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• 1998

Polyphenylvinylketone (PPVK) having a carbonyl group at the side chain was blended with polystyrene (PS) to investigate the effect of vinylketone polymers on the photodegradability of the blend as a function of U.V. irradiation time. Hydrogenated polyphenylvinylketone (PPVK(H)) which is made by hydrogenation of some of the carbonyl groups in PPVK was also blended with PS to check the role of carbonyl carbonyl group in the process of photodegradation. Photodegradability was also investigated for blends of PS with polymethylvinylketone (PMVK) and for copolymers of styrene and methylvinylketone (SMVK) to compare the effect of copolymerization versus blending on photodegradability. PPVK showed higher photodegradability than PPVK(H), which followed that the blends of PS with PPVK gave higher degradability than with PPVK(H). In view of the fact that PPVK(H) is a partially hydrogenated version of PPVK, carbonyl group was confirmed to be involved in the photodegradation mechanism. When polymethylvinylketone (PMVK) was blended with PS, this blend showed a higher degradability than PS/PPVK blend. Therefore the highest photodegradability was achieved when PS was blended with PMVK followed by PPVK and PPVK(H) in order. When SMVK was UV irradiated, it showed the highest photodegradability than any blends mentioned above. Therefore, copolymerization was proved to be the better means of photodegradation than blending.

• Journal of the Korean GEO-environmental Society
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• v.10 no.6
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• pp.89-98
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• 2009

In this research, settling tests with marine clays in Korea and extensive literature review were performed to investigate the characteristics of sedimentation and consolidation so that their behaviors during dredging and reclamating could be evaluated. Design parameters related to Yano's method (1985), one of experimental approaches having been used widely in Korea to estimate sedimentation and consolidation, were analyzed and their proprieties were reassessed. For samples from four different sites of south and west coasts in Korea respectively, settling tests with 1m height of columns were carried out, changing initial water content and height of sample in order to evaluate settling and consolidation characteristics of them from analyzing test results. More reliable regression curves than values from literature review were obtained as analyzing test results of estimating coefficient of sedimentation/ consolidation and initial setting velocity with changing initial water content. Relation between height of soil solid and surface height of slurry at the stages of initiation and termination of consolidation was also assessed. Finally, for marine clays of south and west coasts of Korea, ranges and average values of these design parameters were evaluated and typical empirical equations between these design parameters were also proposed. On the other hand, comparisons of characteristics of sedimentation and consolidation between marine clays from south coast and them from west coast were also performed.