• Archives of Plastic Surgery
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• 제39권3호
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• pp.238-243
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• 2012

Background : The publication rate of presentations at medical international meetings has ranged from 11% to 78% with an average of 45%. To date, there are no studies about the final rate of publications at scientific meetings associated with plastic surgery from Korea. The present authors investigated the publication rate among the presentations at meetings associated with plastic surgery. Methods : The titles and authors of the abstracts from oral and poster presentations were collected from the program books of the Congress of the Korean Society of Plastic and Reconstructive Surgeons (CKSPRS) for 2005 to 2007 (58th-63rd). All of the abstracts presented were searched for using PubMed, KoreaMed, KMbase, and Google Scholar. The titles, key words from the titles, and the authors' names were then entered in database programs. The parameters reviewed included the publication rate, type of presentation including running time, affiliation, subspecialty, time to publication, and publication journal. Results : A total of 1,176 abstracts presented at the CKSPRS from 2005 to 2007 were evaluated. 38.7% of the abstracts, of which oral presentations accounted for 41.0% and poster presentations 34.8%, were published as full papers. The mean time to publication was 15.04 months. Among journals of publication, the Journal of the Korean Society of Plastic and Reconstructive Surgeons was most used. Conclusions : Brilliant ideas and innovative approaches are being discussed at CKSPRS. The 38.7% publication rate found from this research appeared a bit lower than the average rate of medical meetings. If these valuable presentations are not available as full papers, the research would be a waste of time and effort.

• 유기물자원화
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• 제12권4호
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• pp.85-94
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• 2004

본 연구에서는 가연성 건설폐기물인 폐목재와 폐발포폴리스티렌의 유효이용을 목적으로 열압성형법에의한 폐목재-플라스틱 복합패널을 제조하였다. 전열프레스를 이용하여 다양한 성형조건하에서 복합패널 공시체를 제조하였으며, 그 겉보기 밀도, 흡수율, 흡수에 의한 두께 팽창률, 휨강도 등에 관한 일련의 실험을 행하였다. 폐목재-플라스틱 복합패널의 밀도는, 성형 온도 및 성형 시간에 관계없이, 성형 압력의 증가에 따라 높아지는 반면, 그 흡수율의 성형압력의 증가에 따라 작아진다. 복합패널의 흡수에 의한 두께 팽창률은, 성형 조건에 관계없이, 모두 1.2~2.0%의 범위에 있어, 높은 치수 안정성을 보인다. 복합패널의 휨강도는, 성형 온도 $120^{\circ}C$, 성형 시간 15min에서 일정하게 되는 경향이 있으며, 성형 온도 및 성형 시간에 관계없이, 성형 압력의 증가에 따라 현저하게 증가한다. 중합 반응과 성형을 동시에 하는 리액션프로세싱인 이 방법은, 그 제조 공정이 간단하고, 또한, 결합재로서 폐발포폴리스티렌 용액을, 골재로서 폐목재 칩을 이용하기 때문에, 공업 생산성이 있는 건설 발생 폐목재 및 폐발포폴리스티렌의 리사이클 방법으로서 지극히 유효하다고 생각된다.

• 환경영향평가
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• 제18권6호
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• pp.453-460
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• 2009

In order to provide fundamental data for developing high-grade(high-quality and low-pollution) Refuse Derived Fuel(RDF), we analyzed caloric value and HCl content by Municipal Solid Waste(MSW) type. The caloric value was analyzed using calorimeter and HCl content was analyzed using mercury(II) thiocyanate method. In case of paper type the caloric value was 3,060~3,608kcal/kg and the HCl content was 239~6,135ppm. In case of vinyl-plastics the caloric value was 5,946~9,888kcal/kg and the HCl content was 429~455,771ppm. According to the result of quality assessment by MSW type, the calroric value of vinyl-plastics type was showed higher than that of paper type and in case of HCl content the paper type was showed lower than vinyl-plastics type. So, We mixed paper and plastic wastes. The caloric value of mixed MSW(paper and plastics) was 5,046~9,125kcal/kg and the HCl content was 239~6,135ppm. Also, The caloric value of packaging waste(film-plastics) was 5,982~8,045kcal/kg. Therefore It is possible to develop high-grade Refuse Derived Fuel through suitable mixing of paper and plastic in municipal solid waste.

• Journal of Microbiology and Biotechnology
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• 제32권12호
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• pp.1561-1572
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• 2022

Plastic pollution has been recognized as a serious environmental problem, and microbial degradation of plastics is a potential, environmentally friendly solution to this. Here, we analyzed and compared microbial communities on waste plastic films (WPFs) buried for long periods at four landfill sites with those in nearby soils to identify microbes with the potential to degrade plastics. Fourier-transform infrared spectroscopy spectra of these WPFs showed that most were polyethylene and had signs of oxidation, such as carbon-carbon double bonds, carbon-oxygen single bonds, or hydrogen-oxygen single bonds, but the presence of carbonyl groups was rare. The species richness and diversity of the bacterial and fungal communities on the films were generally lower than those in nearby soils. Principal coordinate analysis of the bacterial and fungal communities showed that their overall structures were determined by their geographical locations; however, the microbial communities on the films were generally different from those in the soils. For the pulled data from the four landfill sites, the relative abundances of Bradyrhizobiaceae, Pseudarthrobacter, Myxococcales, Sphingomonas, and Spartobacteria were higher on films than in soils at the bacterial genus level. At the species level, operational taxonomic units classified as Bradyrhizobiaceae and Pseudarthrobacter in bacteria and Mortierella in fungi were enriched on the films. PICRUSt analysis showed that the predicted functions related to amino acid and carbohydrate metabolism and xenobiotic degradation were more abundant on films than in soils. These results suggest that specific microbial groups were enriched on the WPFs and may be involved in plastic degradation.

• Smart Structures and Systems
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• 제22권4호
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• pp.433-440
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• 2018

Pavements porous concrete is a noble structure design in the urban management development generally enabling water to be permeated within its structure. It has also capable in the same time to cater dynamic loading. During the technology development, the quality and quantity of waste materials have led to a waste disposal crisis. Using recycled materials (secondary) instead of virgin ones (primary) have reduced landfill pressure and extraction demanding. This study has reviewed the waste materials (Recycled crushed glass (RCG), Steel slag, Steel fiber, Tires, Plastics, Recycled asphalt) used in the pavement porous concretes and report their respective mechanical, durability and permeability functions. Waste material usage in the partial cement replacement will cause the concrete production cost to be reduced; also, the concretes' mechanical features have slightly affected to eliminate the disposal waste materials defects and to use cement in Portland cement (PC) production. While the cement has been replaced by different industrial wastes, the compressive strength, flexural strength, split tensile strength and different PC permeability mixes have depended on the waste materials' type applied in PC production.

• 한국환경과학회지
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• 제18권10호
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• pp.1181-1187
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• 2009

Results for application of RDF(Refuse Derived Fuel) to selected wastes in metropolitan and small and medium cities are as follows. The physical characteristics of waste are paper, plastic, food waste, and so on. The proximate analysis in P city showed 20.2% of moisture, 71% of combustible material, and 8.8% of ash on annual average. That in G city showed 31.6% of moisture, 59.5% of combustible material, and 8.9% of ash. Ultimate analysis in P city showed 52.04% of carbon, 7.02% of hydrogen, 28.80% of oxygen, 0.66% of nitrogen, and 0.09% of sulfur. Heating value was 3,363 kcal/kg. Ultimate analysis in G city showed 50.85% of carbon, 6.56% of hydrogen, 29.86% of oxygen, 0.79% of nitrogen, and 0.12% of sulfur. Heating value in the G city was somewhat lower than that in the P city with 2,632 kcal/kg. Thus, application of RDF in metropolitan city was more effective than that in small and medium cities. Heating value in mixture for the P city was lower than that in waste of the volume rate waste charge system alone by 143 kcal/kg. In proximate analysis, moisture, and combustible material were likely to be more adequate to RDF.

• 한국전기전자재료학회논문지
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• 제33권6호
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• pp.505-509
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• 2020

The development of diesel power generation is predominantly geared toward island areas or ships because diesel exhibits weak scale-merit characteristics and power quality problems, which are associated with environmental pollution. However, a new energy paradigm, distribution energy resource (DER), has been emerging as a renewable energy source due to the existing structural problems in waste disposal and complex factors such as the conversion technology of waste emulsified oil (WDF). By combining extended producer responsibility (EPR) support and renewable energy certificates (REC), including waste energy REC 0.25 for other bioenergy and REC 1.0 for power transactions, an adequate profit model can be built through self-energetic power generation, thereby drawing keen attention from related industries. Therefore, if WDF is used appropriately as a high-quality engine fuel, it can lead to the development of various fields such as novel renewable energy sectors, waste management, and EPR-related industries. This study is intended to produce WDF using plastic waste by using it as engine-generator fuel. Moreover, we investigate ways to improve the quality and suitability of WDF as an engine fuel.

• Geomechanics and Engineering
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• 제20권6호
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• pp.497-503
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• 2020

In the Kingdom of Saudi Arabia, the shallower depth of the earth's crust is composed of loose dune or beach sand with soluble salts. The expansive behavior of salt bearing soil, fluctuation of ground water table and extreme environmental conditions offer a variety of geotechnical problems affecting safety and serviceability of the infrastructure built on it. Despite spending money, time and other resources on repair and rehabilitation, no significant attention is paid to explore the root causes of excessive differential settlement and cracking to these facilities. The scientific solution required to ensure safety and serviceability of the constructed infrastructure is to improve the strength and durability properties of the supporting ground. In this study, shredded plastic is employed as a low cost and locally available additive to improve strength characteristics of the desert sand. The study shows a remarkable increase in the shear strength and normal settlement of the soil. A seven (07) degree increase in angle of internal friction is achieved by adding 0.4 percent of the shredded plastic additive. The effect of different proportions and sizes of the plastic strips is also investigated to obtain optimum values. Such a long-lived solution will seek to reduce maintenance and repair costs of the infrastructure facilities laid on problematic soil along with reduction of environmental pollutants.

• Archives of Plastic Surgery
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• 제41권4호
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• pp.418-420
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• 2014

Congenital melanocytic nevus consists of congregations of nevomelanocytes. It is found in approximately 1% of new born infants. Congenital melanocytic nevus needs to be excised before it transforms into a malignant lesion. Many strategies have been attempted for the removal and reconstruction of the nevus. Serial excision enables wound closure to be accomplished with a shorter scar than if the original lesion was elliptically excised in a single stage and reorientation of the scar closer to the relaxed skin lines. The routine utilization of an elliptical serial excision as a standard method of closure often leads to the formation of elongated scars and waste of skin. The "Cogwheel pattern" serial excision is a new technique for reducing the size of the nevus efficiently. Reducing the final scar length, distributing the tension over many directions, and having the chance of decrease in operation numbers are ultimately achieved with the use of the "Cogwheel pattern" serial excision.

• 자원리싸이클링
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• 제26권1호
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• pp.69-77
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• 2017

폐소형가전의 재활용 공정에서 발생하는 플라스틱류 중 검정색 플라스틱의 경우 재질 선별이 어려워 혼합물의 형태로 저급 재활용 되고 있다. 본 연구에서는 검정색 플라스틱의 재질별 선별을 위하여 비중선별, 정전선별, 근적외선 선별 및 IR/Raman 분광법 등 기존 선별 기술의 검토를 통하여, 현장 적용에 대한 문제점 및 제한사항을 확인하였다. 검정색 플라스틱의 재질선별에 대한 기술적 한계를 극복하기 위하여 레이저유도붕괴분광법(Laser Induced Breakdown Spectroscopy, LIBS)을 이용하여 검정색 플라스틱의 각 재질별 LIBS 스펙트럼을 분석하였으며, 정규화 과정을 수행한 후 차원축소 알고리즘인 주성분 분석(Principal Component Analysis, PCA)을 수행하였다. 또한, 검정색 플라스틱의 각 재질별 LIBS 스펙트럼 분석 및 주성분 분석을 통하여 향후 재질별 인식 및 선별 기술의 현장적용을 위해서는 추가적으로 해결해야 할 문제점을 확인하였다. 검정색 플라스틱의 재질별 인식의 정확성 및 선별효율의 향상을 위하여 지능형 알고리즘 분야의 연구를 통하여 효율이 우수한 분류기를 설계하고 분류기의 성능 및 신뢰도 향상을 위한 연구가 추가적으로 진행되어야 할 것으로 사료된다.