• Journal of the Korean Geotechnical Society
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• v.21 no.3
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• pp.79-85
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• 2005

An experimental study was carried out to investigate the recycling possibility of waste oyster shells, which induce environmental pollutions by piling up out at the open or the temporary reclamation. The purpose of this study is to develope eco-friendly binder using waste oyster shells, and to reinforce dredged soils fur soft soil improvement. In this paper, a series of laboratory tests including compressive strength tests were performed to evaluate strength characteristics of soils treated by developed binder with different water content of dredged soils, mixing rates of binder, curing days. Based on test results, eco-friendly binders manufactured from waste oyster shells were estimated as good resource materials for soft soil improvements.

• Korean Institute of Interior Design Journal
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• v.22 no.2
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• pp.157-166
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• 2013

The underground space of urban entertainment center can do various roles for urban development. Especially, the design of underground space using natural elements is necessary to sustainable development of facilities. The purpose of this study is to propose the elements, characteristics and application around interior environmental design using natural elements in underground space of urban entertainment center. The research methods of this study are research references, survey and field-study. This study can be concluded as follows; First, the factors of interior environmental design using natural elements in underground space of urban entertainment center are 'landmarks expression of natural elements', 'introduction and planning of daylighting', 'planning of materials using natural images', 'planning of ecological footpath' and 'planning of energy recycling'. Second, pedestrian space and openspace considering regional context are necessary. Third, introduction of daylight and design of artificial lighting in underground space are needed to making eco-friendly environment. Fourth, landmark design using various natural elements in underground space is needed to provide eco-friendly amenity. Fifth, the interior environmental design using natural elements is needed to community space in underground space. Sixth, eco-friendly pedestrian space in underground space is necessary. Seventh, interior environmental design using natural elements is needed to the entrance of underground space of urban entertainment center.

• Proceedings of the Korean Geotechical Society Conference
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• 2005.03a
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• pp.553-560
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• 2005

An experimental investigation was carried out to study recycling possibility of waste oyster shells, which induce environmental pollutions from piling up out at the open or the temporary reclamation. The purpose of this paper is to develop eco-friendly binder using waste oyster shells, and to investigate their reinforcing effects for dredged soil improvement. A series of laboratory tests including compressive strength tests were performed to evaluate strength characteristics of soils treated by developed binder with varying water content of dredged soils, mixing rates of binder, and different curing days. Based on laboratory test results, eco-friendly binders developed here using waste oyster shells were found as good resource materials for soft soil improvements.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.24 no.2
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• pp.256-262
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• 2015

This study has an innovative improvement of the ocher tiles production system that aims to resolve social issue of industrial waste and to meet the customer needs for environmental-friendly building materials. By changing a wet type cutting method to a dry type of ocher tiles production system, the three processes such as cleaning, dehydration, and drying can be removed in existing overall process of 17 steps. Accordingly, the application of the wet type cutting method, which is proposed in this study, makes an increase in ocher tiles production from 1,500 to 1,850 pieces per hour. In particular, industrial wastewater that was emerging as the biggest problem in environmental pollutants in the wet cutting method has been removed. In addition, the most serious problems of noise and dust from the operator side, while developing a device for the dry cutting method, are eliminated through the development of additional equipment.

• Korean Journal of Human Ecology
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• v.9 no.3
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• pp.23-36
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• 2006

The present study purposed to examine how the knowledge, consciousness and attitude affect life resources use of the subjects, first-year middle school students and their mothers, and ultimately, to provide basic materials for maximizing the effect of the education consciousness and attitude on environment-friendly life resource management in everyday living. The followings are the results of the analysis of the collected data. First, in the aspects of analysis of valiance in the general home environment factors of this research, there were some significance according to fathers and mothers' educational level, fathers' job, the type of a house about students and mothers' life resources use. Second, knowledge about middle school students' life resources use had negative correlations with attitude. But consciousness had positive correlations with attitude. Knowledge about their mothers' life resources use had negative correlations with attitude, but consciousness had positive correlations with attitude. The results of mothers were similar to those of middle school students. Mothers' consciousness and attitude had positive correlations with middle school students' consciousness and attitude.

• Transactions on Electrical and Electronic Materials
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• v.11 no.4
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• pp.174-177
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• 2010

We have developed an environment-friendly etching process, an alternative to the dichromic acid etching process, as a pretreatment of acrylonitrile-butadiene-styrene (ABS) plastic for electroless plating. In order to plate ABS plastic in an electroless way, there should be fine holes on the surface of the ABS plastic to enhance mechanically the adhesion strength between the plastic surface and the plate. To make these holes, the surface was coated uniformly with dispersed chemical foaming agents in a mixture of environmentally friendly dispersant and solvent by the methods of dipping or direct application. The solvent seeps into just below the surface and distributes the chemical foaming agents uniformly beneath the surface. After drying off the surface, the surface was heated at a temperature well below the glass transition temperature of ABS plastic. By pyrolysis, the chemical foaming agents made fine holes on the surface. In order to discover optimum conditions for the formation of fine holes, the mixing ratio of the solvent, the dispersant and the chemical foaming agent were controlled. After the etching process, the surface was plated with nickel. We tested the adhesion strength between the ABS plastic and nickel plate by the cross-cutting method. The surface morphologies of the ABS plastic before and after the etching process were observed by means of a scanning electron microscope.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.11a
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• pp.25-26
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• 2018

Various concrete material technologies and new materials have been developed in accordance with the advancement of buildings. As part of these new technologies, light transparent concrete, which was invented by Hungarian architect Aron Losonczi and attracted worldwide attention, has a technique of arranging optical fiber inside concrete and transmitting the light from exterior to concrete to show silhouette inside. However, due to many disadvantages, application to the field was limited and commercialization was not easy. In Korea, Light Emotion Friendly Concrete has been developed for commercialization. In order to solve the degradation of construction performance caused by the arrangement of expensive optical fiber, which is pointed out as a disadvantage of translucent concrete, It converts expensive fiber into low cost acrylic rod, easy to arrange, pre-assembled to form and post-cast. Therefore, this study aims to improve the mechanical properties of LEFC and to derive optimal combination.

• Journal of the Korea Furniture Society
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• v.22 no.4
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• pp.308-316
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• 2011

The purpose of this study, which has been conducted as a government and academic joint project, is to introduce the design, production and installation of the structures exhibited to let people know the meaning the environment-friendly eco-park - Haneul Park that is located in Mapo-gu, Seoul. The exhibition was held as a part of Green Garden Panorama of Seoul Design Fair 2010 and used the stands of Jamsil Sports Complex as the exhibition space. The key contents of the exhibition consist of four elements; firstly, green plants were placed on the first and second floor stands of the complex in order to create the space inside the main stadium as a space that symbolized green environment. Secondly, the usability of the containers of food was maximized to attract the spectator's interest and induce desire to have it. Thirdly, the efforts of the Mapo-gu office for green environment were emphasized using environment-friendly materials. The process and meaning of the transformation of Nanji Island that had been a waste dump site in the past into Haneul Park - an environment-friendly eco-park were expressed by a four-stage space structure. The majority of installations placed in each stage were sold to visitors during the event so as to minimize the generation of wastes after the event.

• Nuclear Engineering and Technology
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• v.54 no.2
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• pp.456-461
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• 2022

Heavy metal pollution is caused due to anthropogenic activities and is considered as a serious environmental problem which endangers human health and environment. The present study deals with biosorption, an eco-friendly technique for the removal of heavy metal Zn(II) from aqueous medium. Various natural materials have been explored for the uptake of metal ions, where most of them are physically or chemically enhanced. Dry cowdung powder (DCP) has been utilized as a low-cost, environmentally friendly humiresin without any pre-treatment, thus demonstrating the concept of Green Chemistry. Batch biosorption studies using ⁶⁵Zn(II) tracer were performed and the impact of different experimental parameters was studied. Results revealed that at pH 6, 94 ± 2% of Zn(II) was effectively biosorbed in 5 min, at 303 K. The process was spontaneous and exothermic, following pseudo-second-order reaction. The mechanism of heavy metal biosorption employing green adsorbent was therefore elucidated in order to determine the optimal method for removing Zn(II) ions. DCP has a lot of potential in the wastewater treatment industry, as seen by its ability to meet 3A's affordability, adaptability, and acceptability criteria. As a result, DCP emerges as one of the most promising challengers for green chemistry and the zero-waste idea.

• The Plant Pathology Journal
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• v.38 no.4
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• pp.417-422
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• 2022

Apple stem grooving virus (ASGV) is a destructive viral pathogen of pome fruit trees that causes significant losses to fruit production worldwide. Obtaining ASGV-free propagation materials is essential to reduce economic losses, and accurate and sensitive detection methods to screen ASGV-free plantlets during in vitro propagation are urgently necessary. In this study, ASGV was sensitively and accurately quantified from in vitro propagated apple plantlets using a reverse transcription droplet digital polymerase chain reaction (RT-ddPCR) assay. The optimized RT-ddPCR assay was specific to other apple viruses, and was at least 10-times more sensitive than RT-real-time quantitative PCR assay. Furthermore, the optimized RT-ddPCR assay was validated for the detection and quantification of ASGV using micropropagated apple plantlet samples. This RT-ddPCR assay can be utilized for the accurate quantitative detection of ASGV infection in ASGV-free certification programs, and can thus contribute to the production of ASGV-free apple trees.