• Journal of Korea Water Resources Association
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• v.45 no.4
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• pp.361-371
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• 2012

For a basin with existing reservoirs, the necessity of additional water demands has been proposed, as well as a reevaluation of existing reservoir yield has been proposed. The objective of this study is to reevaluate a multipurpose reservoir yield and to assess the possibility of additional water supply according to increase of downstream water demands. Andong and Imha Reservoirs are selected for reevaluation. The standard reservoir operation rule model and the HEC-ResSim model were used for reservoir simulation for 30 years (1979~2008). In this study, water supply reliability was set up as 96.7% and 95.0% with yearly and monthly evaluating unit. In case of 95% water supply reliability with yearly evaluating unit, water supply capability of Andong reservoir was evaluated as 893MCM and water supply capability of Imha reservoir was evaluated as 382MCM, and that results showed that water yields for both reservoirs are less than the original designed yields.

• The Korean Journal of Food And Nutrition
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• v.33 no.6
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• pp.692-701
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• 2020

Centella asiatica (CA) has been widely used as herbal plants. It is a valuable resources. The aim of the present study was to evaluate physiological activities of solvent extracts from CA cultivated in Chungju, Korea (Good tiger care). After preparing water (cold-water, CA-WE; hot-water, CA-HWE) and EtOH extracts (50% EtOH, CA-50E; 70% EtOH, CA-70E), their total polyphenol, flavonoid, and triterpenoid contents, and anti-oxidant activities, and anti-inflammatory activities were examined and compared. CA-70E showed the most potent anti-oxidant activity based on ABTS radical scavenging activity and reducing ability assays, while CA-50E and CA-70E showed the highest DPPH radical scavenging activity. Among major triterpenoid glycosides present in CA, madecassoside and asiaticoside contents were found to be the highest in CA-70E, and madecassic acid and asiatic acid were the highest in CA-50E. In LPS-stimulated RAW 264.7 cells, CA-70E showed the highest TNF-α inhibitory activity, although CA-50E and CA-70E similarly inhibited nitric oxide production. Ethanol extracts significantly inhibited IL-6 and IL-8 production more than water extracts using TNF-α/IFN-γ-stimulated HaCaT cells, indicating its better inhibitory against skin inflammation. Therefore, Chungju-CA EtOH extract, especially 70% EtOH extract, has high physiologically active ingredients and potent anti-oxidant and anti-inflammatory activities, suggesting its industrial application as a functional material.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.33 no.5
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• pp.196-201
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• 2023

In order to improve the efficiency of the water splitting system for hydrogen energy production, the high overvoltage in the electrochemical reaction caused by the catalyst in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) must be reduced. Among them, transition metal-based compounds (hydroxide, sulfide, etc.) are attracting attention as catalyst materials to replace currently used precious metals such as platinum. In this study, Ni foam, an inexpensive metal porous material, was used as a support and β-Ni(OH)₂ microcrystals were synthesized through a hydrothermal synthesis process. In addition, changes in the crystal morphology, crystal structure, and water splitting characteristics of β-Ni(OH)₂ microcrystals synthesized by doping Fe to improve electrochemical properties were observed, and applicability as a catalyst in a commercial water electrolysis system was examined.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.34 no.1
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• pp.30-35
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• 2024

In order to improve the efficiency of the water splitting system for hydrogen production, the high overvoltage in the electrochemical reaction caused by the catalyst in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) must be reduced. Among them, transition metal-based compounds are attracting attention as catalyst materials that can replace precious metals such as platinum that are currently used. In this study, nickel foam, an inexpensive metal porous material, was used as a support, and Fe-doped β-Ni(OH)₂ microcrystals were synthesized through a hydrothermal synthesis process. In addition, in order to improve OER properties, changes in the shape, crystal structure, and water splitting characteristics of Fe-Mo co-doped β-Ni(OH)₂ microcrystals synthesized by co-doping with Mo were observed. The changes in the shape, crystal structure, and applicability as a catalyst for water splitting were examined.

• Proceedings of KOSOMES biannual meeting
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• 2005.11a
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• pp.185-190
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• 2005

This study is to determine an optimal reservoir among many alternative proposals in order to obtain the maximized efficiency under the limited budget. There are many alternative proposals which deal with problems to assign reservoir such as water conversion establishment construction, subterranean water, reservoir, submarine pipeline, water bort, and marine water saving base construction. In this paper, the new model to assign the most reasonable alternative is introduced using 0-1 integer programming. This proposed model has not been applied in the optimal reservoir selection problem yet. This paper will contribute to determine the most reasonable alternative to minimize budget under constraints. Also, this proposal model can be applied to other reservoir selection problem in other regions.

• Journal of Environmental Science International
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• v.25 no.10
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• pp.1381-1387
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• 2016

This study aims to establish baseline data for sustainable monitoring by applying the green city index (GCI), which is set up to evaluate the city level, to the city of Gangneung-si, which was designated as a pilot city for the Low-carbon Green Growth City project by the Ministry of Land, Infrastructure, and Transportation. The GCI was applied in the framework of European systems, while considering the social and economic status of Korea. Indicators from 7 areas-$CO_2$, energy, building, transportation, water, waste, and quality of atmosphere were analyzed, except for qualitative indicators. Results indicate that total $CO_2$ emissions were 30.8 tons per capita, or 2.2 tons per one million units of real GDP. The total final energy consumption was 0.231 TOE/capita, or 0.317 TOE per one million units of real GDP. The percentage of total energy derived from renewable resources was 0.41% and energy consumption by the building was $433.5Mwh/1,000m^2$. The total percentage of the working population travelling to work daily by public transportation (limited to bus) was 19%. Further, the total annual water consumption was $99m^3/capita$, and the water lost in the water distribution system was $0.057m^3/capita/day$. The total annual waste collected was 0.0077 ton per capita, The annual mean emission were 0.014 ppm/day for $NO_2$, 0.005 ppm/day for $SO_2$, and 0.019 ppm/day for $O_3$. The annual mean for PM10 emissions was $39{\mu}g/m^3/day$.

• Journal of the Korean Applied Science and Technology
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• v.32 no.1
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• pp.108-115
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• 2015

Vinca alkaloid compounds including vincamine from Vinca minor L. have been extracted by ethanol and hot water extraction methods. Antimicrobial properties of those extracts have been investigated against dandruff causing microorganism Malassezia furfur, yeast, Gram positive and negative bacteria. Vincamine standard and ethanol extract showed no sign of antimicrobial activity, whereas hot-water extract had the activity against M. furfur. Furthermore hot water extract had antimicrobial activity against Gram positive Bacillus sp. and Gram negative Escherichia coli. Cytotoxic properties of those extracts have also been investigated with HaCaT cell (human keratinocyte), HT-29 cell (human colorectal adenocarcinoma cell) and Raw cell, showing no significant cytotoxic effects. We also measured the ROS using dichlorofluorescein diacetate (DCFDA), a popular fluorescence-based probe for reactive oxygen species detection. The result showed the increasement of reactive oxygen species formation (20%) in HaCaT and HT-29 cell lines.

• Journal of the Korean Professional Engineers Association
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• v.41 no.2
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• pp.51-58
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• 2008

In this paper is described "the water resources policy, a new paradigm of water resources control. the characteristic of rainfall in Korea and the compatibility of a new water routes opening in natural river". Also the construction of the Korean grand waterway in the view of disaster prevention, flood control, irrigation and environment-friendly transportation is needed eventually. And I detail a routes of Korean grand waterway, using of a flood gate, supply of irrigation water. cruse duration, activating under developed region and economic efficiency.

• Journal of environmental and Sanitary engineering
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• v.15 no.3
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• pp.120-127
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• 2000

To facilitate the carriage of goods and products, an improvement of the transportation system is greatly needed in Korea. The construction of the Kyung Bu canal that can traverse over the wide area of southern Korea os proposed to be one of the most favorable choices to resolve this need. To fulfill this plan, we investigated the possibility of connecting the Han River (in the midwest) with the Nak-tong River (in the southeast) via the Cho-ryeong tunnel (20.5 km long and 125 m high). According to topographic and geological mapping analysis, we are capable of selecting the optimal locations for the tunnels and locking systems. The water requirement for high locking systems can be satisfied by constructing additional dams above the Choong-ju area or by introducing water saving lock system. The results of our investigation support the idea such a canal system, if constructed, could lead to a revolution of the Korea's transportation system.

• Proceedings of KOSOMES biannual meeting
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• 2006.11a
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• pp.25-30
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• 2006

Marine traffics near Ulsan approaching waters are crossing and converged at the diverging point of No.1 route- No.2 route and No.1 route -No.3 route and are also concentrated at near No1. route approaching area and the headland of cape Gawnjeol. Because the number of berth will increase to 78 from 49 until 2011 due to additional developments, minor modification is expected for the water utilities. This study examined environmental conditions, marine accidental data, marine traffic capacity, traffic flow survery and fisheries zone status near Ulsan approaching water area. Finally, a questionaire survey was carried ou for experts and users to propose new plan.