• 건강소식
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• v.6 no.7 s.45
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• pp.46-47
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• 1982

• 발명특허
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• v.7 no.3 s.73
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• pp.36-37
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• 1982

• 발명특허
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• v.7 no.12 s.82
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• pp.35-35
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• 1982

• 발명특허
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• v.7 no.6 s.76
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• pp.58-59
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• 1982

• Korean Journal of Environmental Agriculture
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• v.13 no.2
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• pp.142-150
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• 1994

To investigate differences in Cd and Zn contents of paddy soils and rice plants polluted by the municipal and industrial waste water in the Mangyeong River Area, soil and plant samples were collected at several distances from the main inlet and at different depths of the soil. Soil samples were extracted with $4M-HNO_3$ and plant samples were digested with a mixture of $HNO_3$and $HClO_4$for analyzing heavy metals by atomic absorption spectrophotometry. The contents of Cd and Zn in soils ranged from 0.38 to 1.17 and from 33.8 to 464.6mg kg^{-1}, respectively. The average Cd level in 1990 was less than that in 1982, but the Zn level in 1990 was higher than that in 1982 in general. No variation in Cd contents was observed in soils at the different distances from the source of waste water, but Zn contents in soils were lower with the increasing distances from the source of waste water. A significant correlation was observed among Cd content, OM, available silicate, CEC and $Ca^{++}$. Similar results existed among Zn content of 1982, OM and $Ca^{++}$. The Cd content in subsurface soils of 1992 was significantly correlated with Zn, Cu, and Pb in soils, and the Zn content in soils was significantly correlated with the Cu and Pb in soils, regardless of years. The Cd content in leaf blades of rice was more than seven times higher than that in brown rice. The Zn content in rice was higher than that in leaf blades and in panicle axis. The Cd content in panicle axis and the Zn content in all parts of rice were correlated with Zn, Cu and Pb contents in soils. The Cd and Zn contents in brown rice ranged from 0.10 to 0.90mg $kg^{-1}$ and from 4.2 to 95.9mg $kg^{-1}$ in the Mangyeong River Area, respectively.

• Journal of Korea Water Resources Association
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• v.42 no.7
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• pp.579-589
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• 2009

Hwang River in South Korea, has experienced channel adjustments due to dam construction. Hapcheon main dam and re-regulation dam. The reach below the re-regulation dam (45 km long) changed in flow regime, channel width, bed material distribution, vegetation expansion, and island formation after dam construction. The re-regulation dam dramatically reduced annual peak flow from 654.7 $m^3$/s to 126.3 $m^3$/s and trapped the annual 591 thousand $m^3$ of sediment load formerly delivered from the upper watershed since the completion of the dam in 1989. An analysis of a time series of aerial photographs taken in 1982, 1993, and 2004 showed that non-vegetated active channel width narrowed an average of 152 m (47% of 1982) and non-vegetated active channel area decreased an average of 6.6 km2 (44% of 1982) between 1982 and 2004, with most narrowing and decreasing occurring after dam construction. The effects of daily pulses of water from peak hydropower generation and sudden sluice gate operations are investigated downstream of Hapcheon Dam in South Korea. The study reach is 45 km long from the Hapcheon re-regulation Dam to the confluence with the Nakdong River. An analysis of a time series of aerial photographs taken in 1982, 1993, and 2004 showed that the non-vegetated active channel width narrowed an average of 152 m (47% reduction since 1982). The non-vegetated active channel area also decreased an average of 6.6 $km^2$ (44% reduction since 1982) between 1982 and 2004, with most changes occurring after dam construction. The average median bed material size increased from 1.07 mm in 1983 to 5.72 mm in 2003, and the bed slope of the reach decreased from 0.000943 in 1983 to 0.000847 in 2003. The riverbed vertical degradation is approximately 2.6 m for a distance of 20 km below the re-regulation dam. It is expected from the result of the unsteady sediment transport numerical model (GSTAR-1D) steady simulations that the thalweg elevation will reach a stable condition around 2020. The model also confirms the theoretical prediction that sediment transport rates from daily pulses and flood peaks are 21 % and 15 % higher than their respective averages.

• Journal of Sericultural and Entomological Science
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• v.32 no.2
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• pp.85-88
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• 1990

Sap flow in mulberry (Morus species) trees was observed for one month from mid-March in 1981, 1982 and 1990. The results were : 1. Sap flow at 20cm soil depth occurred on April 8, 1981 at 10.1$^{\circ}C$, on April 2, 1982 at 8.3$^{\circ}C$ and March 25, 1990 at 8.7$^{\circ}C$. The data showed a range of 1.8$^{\circ}C$ and 15 days. 2. Water content of the wood decreased with decreasing soil temperature under 8$^{\circ}C$, whereas water content of the cortex remained constant or increased. Water may move form wood to cortex when it was insufficient in cortex. 3. Sap flow at 20cm soil depth occurred when accumulated soil temperature after March 1 about 180$^{\circ}C$.

• Defense and Technology
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• no.9 s.33
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• pp.39-42
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• 1981

Redey는 1974년 이후에는 생산되고 있지 않으며 Stinger는 1978년부터 생산되고 있고 Stinger/Post는 1982년부터 생산될 계획이라고 판단된다. Stinger Alternate는 실용화되지 않고 있는 것으로 알려졌다.

• Korean Architects
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• s.642
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• pp.94-98
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• 2022

• Journal of Astronomy and Space Sciences
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• v.6 no.2
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• pp.127-135
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• 1989

The UBV observations of Epsilon Aurigae from April 1982 to May 1985 had been made at Yonsei University Observatory. The light curves drawn from the observational data are combined with other light curves which are well fitted. In these light curves, secondary light variations, flare activity, mid-eclipse light brightening, and others are checked precisely. Contact times and time of mid-eclipse are determined and compared with the values which were presented on the other papers. Compared with previous eclipses, it is noted that the duration of totality is gradually contracted and the duration of total eclipse is gradually enlarged. Though these phenomena are applied to the disk model which has been more accepted than any other models, those are not explained explicitly. So, a new model, comet model, is suggested and is found to make a neat description to the phenomena revealed on the light curves.