• 한국가스학회지
• /
• 제20권1호
• /
• pp.52-61
• /
• 2016

액화석유가스는 환경 친화적이며 에너지 효율성과 출력성능이 뛰어나 실용성이 높고, 경쟁연료에 비해 가격 경쟁력이 우수하기 때문에 촉망받는 대체연료 중 하나로 간주된다. 스파크점화 엔진에서 직분식 기술은 엔진 체적효율을 눈에 띄게 증가시키며, 상대적으로 더 높은 연소효율이 가능한 성층급기를 이용해 엔진을 작동시킨다. 본 연구에서는 가솔린직접분사 엔진의 원리를 적용하여 가시화 시스템을 장착한 연소실을 설계하였다. 이를 통해 스파크점화직분식 LPG의 점화성과 화염전파 과정을 디지털 방식으로 기록하고 분석하였다. 이러한 연구의 결과는 스파크점화직분식 LPG 엔진의 설계 및 최적화를 위한 광범위한 기초 자료로서 기여하고자 한다.

• 농촌계획
• /
• 제15권3호
• /
• pp.61-79
• /
• 2009

This study discusses developing ecological trails and route alignment in mountainous rural area. Through a process of ecological resources survey, ecological trails and route alignment has been established. Mainly, by focusing on ecological resources in rural areas, it was indifferent to their own ecological resource and charm to make it unique strengths. Based on survey the results, Natural ecology resources, there were the climate factor, surface, geological, terrain analysis. Furthermore, ecological resources were researched and analyzed the elements of it, distribution of resources, types, location, semantic analysis. The results are expressed on the map and recorded by taking pictures. Plant ecosystem, there were actual vegetation, land use, flora analysis. Wild animal ecosystem, it was checked and recorded on 1/1,000 map partition the emergence of wild birds, the number of species distributed by foraging guild, the emergence of amphibians, reptile, mammals and insect species. The site is chosen as rural theme village in 2007, base on their own rich ecological and landscape resources. Therefore, we carried out ecological trails and route alignment plan in accordance with analyzed the natural ecological resource and after setting up the basic goal, ecological trail has been composed and planting has done and direction.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제19권3호
• /
• pp.94-103
• /
• 2014

In this study washing efficiency and desorption isotherms for heavy petroleum oil (HPO), Zn, and Pb bound to complex contaminated soils were examined using various soil flushing agents. Sodium dodecyl sulfate (SDS), methanol, ethylene diamine tetraacetic acid (EDTA), and citric acid were selected as soil flushing agents. 3% (w/v) and 4% SDS showed the highest removal efficiency for HPO, but the difference was not statistically significant (p > 0.05). Thus, 3% SDS was chosen as the best soil flushing agent for HPO. In the case of heavy metals, 0.1-M EDTA showed the highest removal efficiencies. But 0.05-M citric acid was selected due to its economic and eco-friendly strengths. The desorption isotherms obtained using Freundlich and Langmuir models indicated that the maximum desorption characteristics ($K_F$ and $Q_{max}$) of HPO with 4% SDS and 90% methanol and heavy metals with 0.1-M EDTA and 0.1-M citric acid, respectively, were markedly lower than in other cases. In addition, when 4% SDS and 90% methanol were used for HPO in the range of $C_e$ higher than 600 mg/L, and when 0.1M citric acid and 0.1M EDTA were used for Zn and Pb in the range of $C_e$ higher than 300 and 100 mg/L, respectively, the distribution constant converged to certain levels. Thus, constant values of $K_U$ and $K_L$ were determined. It was found that these constants represent the maximum desorption capacity and they can be used as distribution coefficients of desorption equilibrium for the flushing agents. The results of this study provided fundamental information for the selection of the best agents as well as for the process design and operation of soil washing/soil flushing of complex contaminated soils.

• 한국유기농업학회지
• /
• 제19권spc호
• /
• pp.17-20
• /
• 2011

Plant biomass is a huge carbon-complex that has potential as a nutrient. Therefore we extracted and separated useful materials for plant growth from tea leaf and stem. The pre-treatment process including high temperature ($200^{\circ}C$) and pressure (20-40 kgf/$cm^2$) was treated for several minutes and extracted at $120^{\circ}C$ for 30-60 minutes. After that the chemical compositions and ingredients were analyzed from that plant-nutrient. As a result of mineral contents, calcium and magnesium concentrations are higher than other minerals. Also the result of carbohydrates analyses has shown that the sugar oligomer consists of xylose(95.3%) and glucose(4.7%), and the sugar monomer consists in the order of xylose (52.7%) > manose (22.8%) > arabinose (10.8%) > galactose (10.2%) > glucose (3.5%). Before applied to field, in vitro plant growth system and formulation were examined. To evaluate the effect of the nutrients, both strawberry green-house and persimmon fields were used in this test. The treated persimmons were heavier than controls scored at 13-22%. In addition, the storage-period was extended in the treated strawberries. Interestingly in the treated strawberry, the contents of polyphenols were increased (38-57%). These results suggest that the plant-nutrient can afford to help for plant growth and storage, and it can be substituted for other commercial nutrients. In conclusion, this plant-nutrient may help to extend eco-friendly or organic farming in Hadong-gun area.

• 자원리싸이클링
• /
• 제26권5호
• /
• pp.29-38
• /
• 2017

본 연구는 기저귀 재활용을 정책적으로 도입 시 최적의 수거방안을 마련하고자 해외 사례조사를 통해 국내 실정에 맞는 적절한 방안을 제안하고, 실제 수거에서 발생할 수 있는 문제점을 파악하고자 시민들 대상으로 인식조사를 실시하여 사회적 수용도를 높일 수 있는 방안에 대해 조사하였다. 조사 결과 시민들은 경제적 부담 및 위생문제 해결을 위한 방안 마련이 중요하다고 인식하고 있었고, 주거지 근처 전용 수거함에 전용봉투를 통한 주 2회 수거 빈도가 적절하다고 응답하였다. 현행 폐기물관리법 상 재활용 대상이 되는 생활폐기물의 경우 지자체 단위로 업체와 개별 계약을 통해 수거되고 있기 때문에 사용 후 기저귀 역시 현행 방식과 동일하게 지자체 수거 위탁 시스템을 활용하여 자원회수시설에서 최종 처리하는 방안이 적절할 것으로 보인다. 이러한 관점에서 지자체 연계를 통한 시범사업을 가정하고 최적의 지자체를 선정하는 방안을 위해 여러 대안을 제시하였다. 향후 기저귀 재활용을 전 사회적으로 도입할 때 본 연구 조사결과를 통해 도출된 수거방식을 고려하여 인구밀집 지역을 대상으로 시범사업을 기획, 설계하여 운영한다면 보다 경제성이 확보된 결과를 도출할 수 있을 것으로 보인다.

• 미생물학회지
• /
• 제53권4호
• /
• pp.316-319
• /
• 2017

하수처리장 방류수와 하천 중의 항생제 내성인자 분포에 대한 상관성을 분석하기 위해 방류수와 상류 하천수, 하류 하천수를 대상으로 항생제 내성유전자와 전파 관련 유전자를 조사하였다. 3개 지점에서 134~183개의 항생제 내성유전자(ARG) 및 전파 관련 유전자(MGE)가 검출되었으며, 1개의 16S rRNA 유전자에 대한 ARG 및 MGE 유전자의 상대적인 총 합이 0.063~0.422 copy로 분석되었다. ARG와 MGE의 수와 존재량은 방류수에서 가장 높게 검출된 반면, 총 세균 수는 가장 적게 검출됨으로서 하수처리 과정에서 사멸된 세균에 포함된 유전자들이 검출된 것으로 판단된다. 또한 MGE의 존재량 양상이 ARG의 존재량과 상관관계를 보임으로서 항생제 내성균들의 내성기작이 자연내성보다는 획득내성일 가능성을 제시하였다.

• Mycobiology
• /
• 제47권3호
• /
• pp.308-318
• /
• 2019

Bio-sulfur can be produced in the process of desulfurization from a landfill and collected by some microorganism such as Thiobacillus sp. as a sulfur element. In order to investigate practical use of bio-sulfur as an agent for controlling plant disease, in vitro antifungal activity of bio-sulfur was tested against Colletotrichum orbiculare known to cause cucumber anthracnose. Efficacy of bio-sulfur for suppressing anthracnose disease was also evaluated in vivo using cucumber leaves. Mycelial growth of C. orbiculare on medium containing bio-sulfur was inhibited. Disease severity of cucumber leaves pre-treated with bio-sulfur was significantly decreased compared to that of untreated ones. To illustrate how bio-sulfur could suppress anthracnose disease, structures of cucumber leaves infected with C. orbiculare were observed under a fluorescent microscope and a scanning electron microscope (SEM). Cucumber leaves pre-treated with bio-sulfur showed a low rate of appressorium formation whereas untreated ones showed abundant appressoria. Shrunk fungal hyphae were mostly observed on bio-sulfur-pretreated leaves by SEM. Similar results were observed on leaves pre-treated with a commercial fungicide Benomyl(R). These results suggest that inhibition of appressorium formation of C. orbiculare by bio-sulfur may contribute to its suppression of cucumber anthracnose.

• 품질경영학회지
• /
• 제49권3호
• /
• pp.433-446
• /
• 2021

Purpose: The main purpose of this study is to analyze the case of the transparent PET bottle resource circulation project of BYN Black Yak Co., Ltd., present implications, and propose ways to spread it in the future. Methods: In this study, the logic of the Double Diamond Model is applied to analyze the development process of sustainable fashion made from BYN Black Yak Co., Ltd.'s PET Bottle Resource Circulation System. Results: The K-rPET Resource Circulation Project of BYN Black Yak Co., Ltd. is recognized as a best example for its contribution to eco-friendly activities, solving social problems, raising consumer awareness, and sharing recycling habits. Before the plastic bottle becomes a garment, five steps are taken (discharge of PET bottle → collection of PET bottle → recycling of PET bottle → fabrication of yarn → production of the finished product out of the fabric). BYN Black Yak Co., Ltd. has successfully commercialized it by recycling reverse-recovery PET bottles by making solutions to problems that have not been solved at each stage. Conclusion: In addition to efforts to find and strengthen weak links presented in the Theory of Constrains (TOC), it appears to have systematically carried out activities to convert stakeholder discomforts into a package of gain points. As shown in the slogan "We are all in!" the proposal and implementation for the completion of a true environmental system is judged to have truly performed ESG management well for the company's business. ESG management activities at BYN Black Yak Co., Ltd. are expected to continue.

• 한국포장학회지
• /
• 제27권1호
• /
• pp.9-16
• /
• 2021

The present study was conducted to accomplish management efficiency by preparing preemptive measures for consumer dissatisfaction and overcome risks caused by Global Warming through studies of model cases in packaging. Through this study, we made it possible to find a way for companies to prepare for Global warming and consumer dissatisfaction. By contributing to eco-friendly packaging, we are trying to preemptively respond to recent major issues through packaging. Through this experiment, we tried to measure the degree of penetration of Plodia interpunctella H. larva into the insect repellent film produced by printing Ink containing a natural repellent. The control experiment was conducted with an untreated LDPE film to which no insect repellent was applied. The numbers decreased from 17 to 7 when the film was processed with repellent to show experimental results verifying effects of repellent by decrease in 10 (58.8% Decrease). Such results show that it is safe when the film is unfolded but in the case where the film is folded, the Plodia interpunctella H. punches through the film to lead to consumer dissatisfaction and it suggests that this can bring on risks to corporate management. Considering that most of the film is folded in the case of PE bag packaging, the direction which the corporations should take in terms of preparing for climate change countermeasures and consumer dissatisfaction has been clarified. Due to it receiving satisfactory results in safety rest results for printing film applied with pest repellent as well as the Quality analysis to test repellent contents of repellent film, it is certain that the importance of repellent method in packaging will increase in preparing for consumer dissatisfaction and actions against climate change henceforth.

• Journal of Applied Biological Chemistry
• /
• 제64권4호
• /
• pp.433-438
• /
• 2021

폴리에틸렌은 농업용 필름으로 널리 사용되고 있지만, 이를 친환경적으로 분해하기 위한 기술은 부족한 상황이다. 이에 최근 폴리에틸렌 분해를 위한 친환경 기술 개발에 대한 관심이 높아지고 있다. 폴레에틸렌의 생물학적 분해에는 몇가지 산화 단계가 필요할 것이라고 예상된다. 먼저, 폴리에틸렌 사슬에 2차 알코올이 형성되고, 알코올은 카르보닐기로 산화된다. 이후 과정에서 카르보닐기는 Baeyer-Villiger monooxygenase (BVMO)에 의해 에스터로 전환되고, 이 에스터는 마지막 단계에서 lipase와 esterase에 의해 절단될 것으로 예상된다. 본 연구에서는 폴리에틸렌 분해 과정에 관여하는 중요한 효소 중 하나인 BVMO의 반응 메커니즘, 분류, 효소공학 측면에서 리뷰하였다. 또한 BVMO를 사용한 폴리에틸렌 분해 분야의 향후 연구전망도 간략히 덧붙였다.