• 한국미생물·생명공학회지
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• 제48권4호
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• pp.399-422
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• 2020

도시화 및 산업화로 인해 발생된 중금속으로 오염된 토양의 정화는 인간의 건강 뿐 아니라 지구생태계의 지속성을 위해 매우 중요하다. 중금속 오염 토양 정화 기술 중 식물상복원법은 타 방법에 비해 처리 단가가 저렴하고, 토양 비옥도 및 생물 다양성이 영향을 덜 받는 환경친화적인 방법이다. 이러한 식물상복원법에 식물생장촉진세균(plant growth promoting bacteria, PGPB)을 도입하여 중금속 독성 하에서 식물 생장을 촉진하고 중금속 정화 효율을 향상시킬 수 있다. 본 논문에서는 주요 토양오염물인 중금속의 발생원, 미생물·식물·인간에 미치는 중금속 영향 및 PGPB의 식물생장촉진 기작을 정리하였다. 중금속 오염 토양 정화를 위하여 식물상복원에 PGPB의 활용에 관한 최근 10년 동안의 연구 동향을 분석하였다. 또한, PGPB의 실제 적용 시 중금속 제거 효율에 미치는 다양한 환경 인자와 PGPB의 접종 방법의 영향을 고찰하였다. PGPB 활용 식물상복원 기술의 혁신을 위해서는 실제 현장에서 PGPB의 거동과 식물-PGPB-자생미생물 사이의 상호작용에 대한 이해가 필요하다.

• 한국차세대컴퓨팅학회논문지
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• 제14권6호
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• pp.66-74
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• 2018

최근 가상환경에서 몰입감을 늘리고 자유로운 상호작용을 제공하기 위한 손 제스처 인식에 대한 연구가 활발히 진행되고 있다. 그러나 기존의 연구는 특화된 센서나 장비를 요구하거나, 낮은 인식률을 보이고 있다. 본 논문은 정적 손 제스처와 동적 손 제스처 인식을 위해 카메라 이외의 별도의 센서나 장비 없이 딥러닝 기술을 사용한 손 제스처 인식 방법을 제안한다. 일련의 손 제스처 영상을 고주파 영상으로 변환한 후 손 제스처 RGB 영상들과 이에 대한 고주파 영상들 각각에 대해 덴스넷 3차원 합성곱 신경망을 통해 학습한다. 6개의 정적 손 제스처와 9개의 동적 손 제스처 인터페이스에 대해 실험한 결과 기존 덴스넷에 비해 4.6%의 성능이 향상된 평균 92.6%의 인식률을 보였다. 본 연구결과를 검증하기 위하여 3D 디펜스 게임을 구현한 결과 평균 34ms로 제스처 인식이 가능하여 가상현실 응용의 실시간 사용자 인터페이스로 사용가능함을 알 수 있었다.

• 정보보호학회논문지
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• 제20권3호
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• pp.93-104
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• 2010

모바일 기기의 보편화와 다양한 종류의 모바일 기기들의 등장에 따라 각종 모바일 서비스들이 제공되고 있다. 이런 모바일 서비스가 늘어나면서 문자메시지, 사진 및 동영상, 주소록, 이메일, 공인인증서 및 기타 각종 개인 정보 등과 같이 단말기에 저장되는 사용자의 정보 또한 다양해지게 되었다. 모바일 기기는 분실 및 도난이 용이하기 때문에 이런 개인정보를 보호하는 사용자 인증이 매우 중요하나, 현재 보편적으로 사용되는 개인식별번호 입력 방법 또는 패스워드 입력 방법은 엿보기 공격(Shoulder Surfing Attack: SSA)에 안전하지 않기 때문에 공격자는 쉽게 사용자의 정보를 얻을 수 있다. 기존에 SSA를 막기 위한 방법들이 제안되어 왔으나 사용 편의성이 떨어지고 모바일 환경에서 사용하기 힘들다. 이에 본 논문에서는 모바일 환경에서 SSA에 안전하면서도 사용자 편의성이 뛰어난 새로운 패스워드 입력 방법을 제안한다. 또한 기존 방법들과의 비교 및 사용자 실험을 통하여 다양한 공격에 대한 안전성 및 사용편의성을 보인다.

• 한국컴퓨터정보학회논문지
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• 제28권2호
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• pp.27-38
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• 2023

본 연구는 인스타그래머블 전시인 <유미의 세포들 특별전(2020)>을 대상으로 문헌연구와 정량적 연구방법론으로 인지된 가치와 전시 이용 태도 및 지속적 행동 의사간의 관계성을 조명하는데 그 목적을 두었다. 경험 품질 측면에서 상기 전시는 유희성이 강했으며, 인지된 가치 가운데 사진 촬영은 전시만족도 및 전시몰입도와 양의 상관관계를 가진 반면 인스타그램에서의 관람 경험의 공유는 전시 이용 태도에 유의미한 영향을 미치지 못했다. 전시만족도는 전시몰입도, 지속적 행동 의사의 세부 요인과도 유의미한 상관관계를 가졌다. 특히 스토리텔링 요인이 전시물 요인이나 인스타그램 친화적 전시 환경에 비해 우위를 점유함을 확인할 수 있었으며, 이를 통해 스토리텔링의 중요성을 확인할 수 있었다. 본 연구는 인스타그래머블 전시의 상호작용성과 참여적 특성이 전시 이용 태도에 미친 긍정적인 영향력 및 인지된 가치 요인으로써의 가능성, 인스타그래머블 전시에서의 스토리텔링의 의미에 대한 시사점을 제공해주었다.

• 한국해양바이오학회지
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• 제14권2호
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• pp.133-142
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• 2022

The increased production and consumption of polyethylene terephthalate (PET)-based products over the past several decades has resulted in the discharge of countless tons of PET waste into the marine environment. PET microparticles resulting from the physical erosion of general PET wastes end up in the ocean and pose a threat to the marine biosphere and human health, necessitating the development of new technologies for recycling and upcycling. Notably, enzyme-mediated PET degradation is an appealing option due to its eco-friendly and energy-saving characteristics. PETase, a PET-hydrolyzing enzyme originating from Ideonella sakaiensis, is one of the most thoroughly researched biological catalysts. However, the industrial application of PETase-mediated PET recycling is limited due to the low stability and poor reusability of the enzyme. Here we developed the whole-cell catalyst (WCC) in which functional PETase is attached to the outer membrane of Escherichia coli. Immunoassays are used to identify the surface-expressed PETase, and we demonstrated that the WCC degraded PET microparticles most efficiently at 30℃ and pH 9 without agitation. Furthermore, the WCC increased the PET-degrading activity in a concentration-dependent manner, surpassing the limited activity of soluble PETase above 100 nM. Finally, we demonstrated that the WCC could be recycled up to three times.

• Computers and Concrete
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• 제30권2호
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• pp.99-111
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• 2022

In this study, deep learning and k-Nearest Neighbor (kNN) models were used to estimate the sorptivity and freeze-thaw resistance of self-compacting mortars (SCMs) having binary and ternary blends of mineral admixtures. Twenty-five environment-friendly SCMs were designed as binary and ternary blends of fly ash (FA) and silica fume (SF) except for control mixture with only Portland cement (PC). The capillary water absorption and freeze-thaw resistance tests were conducted for 91 days. It was found that the use of SF with FA as ternary blends reduced sorptivity coefficient values compared to the use of FA as binary blends while the presence of FA with SF improved freeze-thaw resistance of SCMs with ternary blends. The input variables used the models for the estimation of sorptivity were defined as PC content, SF content, FA content, sand content, HRWRA, water/cementitious materials (W/C) and freeze-thaw cycles. The input variables used the models for the estimation of sorptivity were selected as PC content, SF content, FA content, sand content, HRWRA, W/C and predefined intervals of the sample in water. The deep learning and k-NN models estimated the durability factor of SCM with 94.43% and 92.55% accuracy and the sorptivity of SCM was estimated with 97.87% and 86.14% accuracy, respectively. This study found that deep learning model estimated the sorptivity and durability factor of SCMs having binary and ternary blends of mineral admixtures higher accuracy than k-NN model.

• 한국기계가공학회지
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• 제21권5호
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• pp.98-104
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• 2022

When processing parts, the cutting oil can improve the cooling performance of the workpiece and tool to increase the precision of the workpiece or extend the life of the tool and facilitate chip extraction. Since such cutting oil has a harmful effect on the environment and the human body due to additives such as sulfur, research on a minimum lubrication supply method using an eco-friendly oil is recently underway. The minimum lubrication supply method minimizes the amount of cutting oil used during processing and processes it, which can reduce the amount of cutting oil used, but has a problem in that cooling performance efficiency is poor. Therefore, this study conducted a study on mist cooling of lubricants to reduce the amount of cutting oil used and maximize the cooling effect of processing heat generated during tapping processing. Spray pressure, processing speed, direction, and lubricant spray amount, which are considered to have an effect on cooling performance, were set as process conditions, and the effect on temperature was analyzed by performing an experiment using the box benquin method among experiments were analyzed. Through the experimental analysis results, the optimal conditions for mist and processing that maximize the cooling effect were derived, and the validity of the results derived through additional experiments was verified. In the case of processing by applying the mist lubrication method verified through this study, it is considered that high-precision processing is possible by improving the cooling effect.

• Journal of Ecology and Environment
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• 제46권2호
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• pp.144-153
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• 2022

Background: Bamboo forests provides benefits for nature and the welfare of the people of Turen in Malang Regency and Sumbermujur in Lumajang Regency. They interact with the forest to live through the development of forest potential based on local wisdom. This is believed to prevent various adverse impacts on the forest. Local wisdom is related to beliefs or/and taboos, ethics and rules, techniques and technology, as well as forest/ land management traditions carried out by the community in building, managing forests, and Turen springs in Malang Regency and Sumbermujur in Lumajang Regency. Therefore, it is important to study the potential of bamboo forests in Turen and Sumbermujur for ecotourism, the development of bamboo forest ecotourism in Turen and Sumbermujur based on local wisdom, and the potential of bamboo forests in Turen and Sumbermujur in sustainable spring conservation. Results: Bamboo forest ecotourism has become an attractive tourist attraction. It is also beneficial for environmental conservation and the welfare of the surrounding community. The potential of bamboo forests in ecotourism development consists of various types of old bamboo that are fertile which offer environmentally friendly tourism activities by prioritizing aspects of nature conservation and socio-cultural empowerment of the local community. This cannot be separated from the belief that bamboo has supernatural powers (as a protector), so they do not dare to take or damage the existing bamboo. This behavior has a positive impact on springs that are still sustainable. Conclusions: Therefore, the charm of the bamboo forest is a potential that can be developed through ecotourism based on local wisdom. The development of bamboo forest ecotourism based on local wisdom is able to meet the living needs of the surrounding community.

• 한국의상디자인학회지
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• 제25권1호
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• pp.15-31
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• 2023

This study aimed to propose a fashion design development method using the external and internal characteristics of the flower and bird paintings in traditional Korean folk paintings. As a research method, external and internal characteristics of folk paintings were examined through previous studies and literature research, and folk painting patterns were developed into digital textile designs. Five 3D digital fashion designs were proposed using the CLO 3D program. The external characteristics of folk paintings were as follows: simplification and planarization of object representation, diversification of viewpoints, ignorance of perspective and symmetrical enumeration, strong colors and contrast effects, and the simultaneous representation of time. The internal characteristics of folk paintings were as follows: symbolic meaning, the beauty of free humor, modest aesthetics, complexity of reality and fantasy, and desire of shamanism. The results are as follows. Firstly, the flower and bird painting was a decorative painting style that emphasized decorative beauty and was suitable for developing fashion designs with Korean originality because of the symbolic and internal meanings. Simple layouts and bold free-spirited representations were effective ways to fill the screen with objects and gave the pattern a decorative effect. Secondly, developing a virtual clothing prototype based on digital design method using the external and internal characteristics of folk paintings and producing realistic fashion designs suggest the integrated use of science and technology, embodying modern fashion through the combination of digital fashion content and traditional cultural content. Thirdly, as a result of the development of 3D digital fashion designs, an eco-friendly and sustainable fashion design methods with virtual clothing can suggest a design development method that saves time and cost in the fashion design process while considering the environment.

• Advances in nano research
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• 제15권5호
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• pp.441-449
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• 2023

Heavy metals, widely present in the environment, have become significant pollutants due to their excessive use in industries and technology. Their non-degradable nature poses a persistent environmental problem, leading to potential acute or chronic poisoning from prolonged exposure. Recent research has focused on separating heavy metals, particularly from industrial and mining sources. Industries such as metal plating, mining operations, tanning, wood and chipboard production, industrial paint and textile manufacturing, as well as oil refining, are major contributors of heavy metals in water sources. Therefore, removing heavy metals from water is crucial, especially for safe water supply in swimming and water sports. Iron oxide nanoparticles have proven to be highly effective adsorbents for water contaminants, and efforts have been made to enhance their efficiency and absorption capabilities through surface modifications. Nanoparticles synthesized using plant extracts can effectively bind with heavy metal ions by modifying the nanoparticle surface with plant components, thereby increasing the efficiency of heavy metal removal. This study focuses on removing lead from industrial wastewater using environmentally friendly, cost-effective iron nanoparticles synthesized with Genovese basil extract. The synthesis of nanoparticles is confirmed through analysis using Transmission Electron Microscope (TEM) and X-ray diffraction, validating their spherical shape and nanometer-scale dimensions. The method used in this study has a low detection limit of 0.031 ppm for measuring lead concentration, making it suitable for ensuring water safety in swimming and water sports.