• 대한지리학회지
• /
• 제46권1호
• /
• pp.1-19
• /
• 2011

대자율 및 입도 분석, OSL 연대측정, 주원소, 희토류 및 미량원소 분석을 통해 거창 정장리 뢰스-고토양의 물리, 화학적 특징을 파악하였다. 거창 뢰스-고토양 연속층의 입도 특성은 하안단구를 형성하는 하천퇴적층 그리고 중국 뢰스고원과는 차이를 보인다. 뢰스-고토양 층서 가운데 L1과 L1L1은 MIS 2, L1S1은 MIS 3, L1L2는 MIS 4, S1은 MIS 5, L2는 MIS 6에 대비되므로 거창단면이 위치하는 하안단구는 MIS 7에 형성된 것으로 판단된다. 다만 MIS 3 시기에 남부지방이 중부지방보다 더 온난습윤하였을 가능성이 있다. 주원소와 희토류 원소, 미량원소 조성은 거창의 뢰스-고토양이 중국 뢰스고원보다 풍화가 더 많이 진행되었으며 중국 뢰스고원에서 기원하였음을 지시한다. 이것은 한반도의 다른 지역에서 이루어진 연구 결과와 조화된다.

• Communications for Statistical Applications and Methods
• /
• 제12권2호
• /
• pp.349-357
• /
• 2005

We suggest a functional technique with loess smoothing for estimating the change-point when there is one change-point in the mean model. The proposed change-point estimator is consistent. Simulation study shows a good performance of the proposed change-point estimator in comparison with other parametric or nonparametric change-point estimators.

• 한국의류산업학회지
• /
• 제2권2호
• /
• pp.118-122
• /
• 2000

Dyeing properties of silk fabric with loess were studied by investigating the effect of dyeing conditions, such as concentration of loess, dyeing temperature and time, on dye uptakes. And also the effects of mordant and mordanting methods on color change and dye uptakes were inverstigated. For the practical use, the various color fastness of dyed fabric were evaluated. The dye uptakes of dyed fabric were increased gradually with increasing concentration of loess, dyeing time and temperature. The K/S value of dyed fabric most efficient for the premordanting method. The color fastness was improved when mordants were added.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 2003년도 학술발표논문집
• /
• pp.147-150
• /
• 2003

According to development and urbanization of country, environment and ecosystem were ignored during the past thirty years. Therefore canal, which had been developed by concrete, is remained as the space where life can not alive any longer. In this study, Environmental friendly canal construction method using porous loess block are investigated. Porous loess blocks are which is developing focused on both scenery and hydraulic safty. Canal using Porous loess blocks can take a vegetation's distribution and improvement of soil properties and hydraulic safty of bank. In this study, The examination of applied canal construction method using porous loess block that is considering vegetation's distribution and properties of material is done to present development of environmental friendly canal construction method.

• 한국염색가공학회지
• /
• 제18권4호
• /
• pp.1-10
• /
• 2006

Tannin treatment has been used for improving the color fastness of dyed materials. In natural dyeing, the tannin treatment is highly effective in improving the fastness. The chitosan treatment also improves the fastness and depth of shade in natural dyeing. In this study, the effects of tannin and chitosan pre-treatment on the color and fastness in loess dyeing were investigated. Cotton woven fabric specimens and cotton knit fabric specimens were pre-treated with chitosan solution in acetic acid, and the specimens were then treated with or without tannin. The specimens were finally dyed with loess. The tannin treatment decreased the K/S values, while the chitosan treatment increased the K/S. Both the tannin treatment and the chitosan treatment increased the wash fastness and light fastness. In tannin treatment, tannin component and Fe component of loess may react together to decrease the lightness and develop dark color. For maintaining inherent color of the loess, it is much preferable to employ chitosan treatment rather than tannin treatment.

• 한국환경과학회지
• /
• 제8권4호
• /
• pp.497-502
• /
• 1999

Removal of Pb(Ⅱ), Cu(Ⅱ), Cr(Ⅲ), and Zn(Ⅱ) ions from aqueous solutions using the adsorption process on domestic loess minerals has been investigated. Variations of contact time, pH, adsorption isotherms and selectivity of coexisting ions and leachate were experimental parameters. YDI, YPT and KRT samples diluted in 1% aquous solution which was adjusted pH 10.8, 8.0 and 6.50, respectively. The result of XRD measurement, Quartz was mainly observed in all samples. In the case of KRT sample, Kaolinite, Feldspar, Chlorite consisting of clay minerals shows almost same pattern with YPT samples. Different properties showed from the YDI sample containing Iillite, remarkably. For all the metals, maximum adsorption was observed at 30min∼60min. Adsorption of metal ions on loess minerals were reached an equilibrium by shaking the solution for about 30min. Removal efficiency of Pb(Ⅱ) ion for KRT, YPT and YDI were 84.7%, 92% and 100%, respectively. The Cu(Ⅱ) and Zn(Ⅱ) adsorptivity on KRT showed the low in various pH solution However, those on YPT and YDI were high than 90% except for the pH 2 solution. The orders of adsorptivities for domestic loess minerals showed as following : YPT>KRT>YDI. The adsorption isotherms of Cu(Ⅱ) and Zn(Ⅱ) ions on clay minerals were fitted to a Freundlich's. Freundlich constants(1/n) of KRT and YPT domestic loess minerals were 0.63, 0.97 and 0.36, 0.25, respectively.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
• /
• pp.585-588
• /
• 2006

The environment-friendly building material, photocatalyst/scoria/loess concrete, was prepared using scoria and loess (which have merits as building materials) and photocatalyst (which has the functions to compose the environmental contaminants and of self cleaning). In order to apply this material as a building material, the compressive and flexible strengths, and water absorptivity (which have been set by Korea Industrial Standard) were measured. The optimum mixing ratio of photocatalyst/scoria/loess concrete was obtained at the condition of $393kg/m^3$ of coarse aggregate, $802kg/m^3$ of fine aggregate in case of scoria, $80kg/m^3$ of loess, $12kg/m^3$ of photocatalyst, $400kg/m^3$ of cement, and $2kg/m^3$ of AE water reducing agent. The photocatalyst/scoria/loess concrete prepared by above mixing ratio of raw materials showed 25 MPa of compressive strength, $3.8{\sim}4.6$ MPa of flexible strength and $11.4{\sim}12.0%$ of water absorptivity, indicating that the quality of this material was suitable for Korea Industrial Standard (more than 21 MPa for compressive strength, more than 2.0 MPa for flexible strength in case of lightweight aggregate, and less than 15 % for water absorptivity in case of clay brick) for using as a building material.

• ALGAE
• /
• 제22권2호
• /
• pp.141-146
• /
• 2007

Seagrass bed is an important component in coastal and estuarine ecosystems, providing food and habitats to a wide variety of marine organisms. Recently, seagrass coverage has declined significantly due to anthropogenic impacts such as cultural eutrophication and reclamation, and thus efforts are under way to prevent further losses and restore disturbed seagrass habitats worldwide. Seagrass transplantation techniques for habitat restoration include vegetative and seed-based methods. Seagrass seeds can be collected easily, and sowing seeds is an economically effective method for large-scale restoration. However, large numbers of seed can be lost by seed predation and physical disturbance in the planting areas. In the present study, Zostera marina seeds were coated with loess to reduce seed loss by predation and sweeping away by the water currents, and germination rates of coated seeds and seedling growth were examined to assess the feasibility of the seed-coating method for large-scale restoration. Germination rate of the coated seeds with loess was significantly higher than that of the uncoated seeds. Additionally, seedling growths were not significantly different between the coated and the uncoated seeds. These results suggest that coating of eelgrass seeds with loess enhances success of seed germintion with no harmful effects on seedling growth. Therefore, the seed coating method using loess may be an effective and applicable seedbased transplanting technique for large-scale restoration.

• 생태와환경
• /
• 제40권4호
• /
• pp.537-545
• /
• 2007

The heavy metal removal capacity of filamentous green alga Cladophora sp. cultured together with wet-mixed solidified soil (loess) was tested. A Cladophora sp. was cultured for 5d, with added Chu No. 10 medium, in stream water contaminated by high concentration of heavy metals from a closed mine effluent. Heavy metal ion concentrations of the medium and in algal tissue were measured every day during the experiment. Dissolved metals (Al, Cd, Cu, Fe, Mn, Zn) in medium were rapidly removed (over 90% elimination) within 1-2d when alga and loess were added. Dissolved heavy metals dropped by only 10% when algae were cultured without loess. The Cladophora sp. accumulated much more heavy metals when cultured with loess than when the alga was cultured alone. Cladophora sp. exhibited a maximum uptake capacity for Al ($17,000{\mu}g^{-1}$ algal dry weight). The metal bioremoval capacities of the algae were in the order Al, Fe, Cu, Mn, Zn and Cd. The heavy metal removal capacity of Cladophora sp. showed significant increases when wet-mixed solidified soil was added to culture media.

• Bulletin of the Korean Chemical Society
• /
• 제35권8호
• /
• pp.2471-2476
• /
• 2014

The aim of the present study is to explore the possibility of utilizing loess for the adsorption of total phosphorous (T-P) and total nitrogen (T-N) in water. Batch adsorption studies were performed to evaluate the influences of various factors like initial concentration, contact time and temperature on the adsorption of T-P and T-N. The adsorption data showed that loess is not effective for the adsorption of T-N. However, loess exhibited much higher adsorption capacity for T-P. At concentration of $1.0mgL^{-1}$, approximately 97% of T-P adsorption was achieved by loess. The equilibrium data were fitted well to the Langmuir isotherm model. The pseudo-second-order kinetic model appeared to be the better-fitting model because it has higher $R^2$ compared with the pseudo-first-order and intra-particle kinetic model. The theoretical adsorption equilibrium $q_{e,cal}$ from pseudo-second-order kinetic model was relatively similar to the experimental adsorption equilibrium $q_{e,exp}$. The thermodynamic parameters such as free energy ${\Delta}G$, the enthalpy ${\Delta}H$ and the entropy ${\Delta}S$ were also calculated.