• 한국의류산업학회지
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• 제17권6호
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• pp.1020-1029
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• 2015

This paper investigated the wearing performance of knitted fabrics made of air vortex yarns using PTT/tencel/cotton fibres in comparison with ring and compact yarns for emotional garment. Wicking property of knitted fabric made of MVS yarns was worse than those by ring and compact yarns, however, drying property of knitted fabric made of MVS yarns was better than those by ring and compact yarns, which was explained as more water vapor transport due to larger openness between fibres in the MVS yarns than those in the ring and compact yarns. Thermal conductivity of knitted fabric made of MVS was lower than those of ring and compact yarns and maximum heat flow(Q_max) at the transient state of MVS knitted fabric was lower than those of ring and compact yarns, which may be attributed to MVS yarn structure that has parallel fibres in the core part of the yarn and fasciated fibre bundles on the sheath part with roughness on the yarn surface. However, pilling of MVS knitted fabric was better than those by ring and compact yarns, which was caused by less and shorter hairy fibres protruded from MVS yarn surface than those of ring and compact yarns. It was observed that tactile hand of MVS yarn knitted fabrics was stiffer than those of ring and compact yarns knitted fabrics. It was explained by low extensibility and compressibility and high bending and shear rigidities of the MVS yarn knitted fabrics, which resulted in bad wearing performance of MVS knitted fabric.

• 한국의류산업학회지
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• 제17권2호
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• pp.287-294
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• 2015

This study investigates the physical properties of Murata Vortex Spinning (MVS) blended yarn with yarn count(20's, 30's, 40's) and blend ratio(Polyester 100, Polyester70:Cotton30, Polyester50:Cotton50, Polyester30:Cotton70, and Polyester50:Tencel40:Cotton10). This study evaluated tenacity, elongation, bending rigidity, bending hysteresis, hairiness coefficient, irregularity and twist number. The structure of MVS blended yarn influenced stress, strain, bending rigidity, bending hysteresis and the hairiness coefficient of MVS blended yarn decreased as the yarn count increased. MVS blended yarn consists of core and sheath. The core of MVS blended yarn is composed of a parallel fiber with a wrapping fiber that covers thecore fiber. This special structure of the MVS blended yarn effects the physical properties of the yarn; in addition, the mechanical properties of the component fibers influenced the stress, strain, bending rigidity, bending hysteresis and hairiness coefficient of MVS blended yarn with the blend ratio. Polyester decreases and cotton increases resulted in decreased physical properties. A similar polyester content increased the tencel and physical properties. Appropriate physical properties and a variety of touch expression can be realized through a correct blend ratio.

• Membrane and Water Treatment
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• 제14권1호
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• pp.1-10
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• 2023

This study explored the feasibility of calcium-rich food waste, Mactra veneriformis shells (MVS), as an adsorbent for phosphate removal, and its removal efficiency was enhanced by the thermal activation process. The CaCO3 in MVS was converted to CaO by thermal activation (>800 ℃), which is more favorable for adsorbing phosphate. Thermal activation did not noticeably influence the specific surface area of MVS. The MVS thermally activated at 800 ℃ (MVS-800), showed the highest phosphate adsorption capacity, was used for further adsorption experiments, including kinetics, equilibrium isotherms, and thermodynamic adsorption. The effects of environmental factors, including pH, competing anions, and adsorbent dosage, were also studied. Phosphate adsorption by MVS-800 reached equilibrium within 48h, and the kinetic adsorption data were well explained by the pseudo-first-order model. The Langmuir model was a better fit for phosphate adsorption by MVS-800 than the Freundlich model, and the maximum adsorption capacity of MVS-800 obtained via the Langmuir model was 188.86 mg/g. Phosphate adsorption is an endothermic and involuntary process. As the pH increased, the phosphate adsorption decreased, and a sharp decrease was observed between pH 7 and 9. The presence of anions had a negative impact on phosphate removal, and their impact followed the decreasing order CO₃^2- > SO₄²- > NO₃^- > Cl^-. The increase in adsorbent dosage increased phosphate removal percentage, and 6.67 g/L of MVS-800 dose achieved 99.9% of phosphate removal. It can be concluded that the thermally treated MVS-800 can be used as an effective adsorbent for removing phosphate.

• 한국지리정보학회지
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• 제25권4호
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• pp.49-62
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• 2022

시추데이터는 작업자가 작업현장에서 안전하게 공사를 수행할 수 있도록 제공하는 지반정보로, 현재 시추데이터를 3차원 데이터로 만들어서 3차원 형태의 이미지로 볼 수 있도록 지원하고 있다. 지반정보의 3차원 가시화를 이용하여 다양한 프로그램을 개발하는 국내의 기업들은 지반 정보의 3차원 가시화를 위해 C Tech Development Corporation에서 개발한 MVS 프로그램을 사용하고 있다. 그러나 MVS 프로그램은 유료 프로그램이고 국내에서 개발하는 3차원 관련 프로그램에서 사용하기에는 어려움이 있다. 본 논문에서는 파이썬의 Gempy 오프 소스를 이용하여 군집화된 시추정보로 부터 3차원 지층모델을 생성할 수 있도록 MVS를 대체할 수 있는 라이브러리를 개발하고자 한다. 3차원 지층모델 프로그램은 각 지층별 포인트 데이터를 생성하고 보간을 통해서 지층별 표면을 생성한다. 그리고 각 지층별 표면을 합하여 3차원 지층모델 프로그램을 완성한다. 고양 지역의 시추데이터로부터 MVS 프로그램과 제안하는 프로그램으로 3차원 모형을 생성하여 비교하였을 때 큰 차이가 없음을 확인하였다.

• Applied Microscopy
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• 제48권4호
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• pp.96-101
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• 2018

The release of nanoscale membrane-bound vesicles is common in all three domains of life. These vesicles are involved in a variety of biological processes such as cell-to-cell communication, horizontal gene transfer, and substrate transport. Prokaryotes including bacteria and archaea release membrane vesicles (MVs) (20 to 400 nm in diameter) into their extracellular milieu. In spite of structural differences in cell envelope, both Gram-positive and negative bacteria produce MVs that contain the cell membrane of each bacterial species. Archaeal MVs characteristically show surface-layer encircling the vesicles. Filamentous fungi and yeasts as eukaryotic microbes produce bilayered exosomes that have varying electron density. Microbes also form intracellular vesicles and minicells that are similar to MVs and exosomes in shape. Electron and fluorescence microscopy could reveal the presence of DNA in MVs and exosomes. Given the biogenesis of extracellular vesicles from the donor cell, in situ high-resolution microscopy can provide insights on the structural mechanisms underlying the formation and release of microbial extracellular vesicles.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2022년도 추계학술발표대회
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• pp.646-647
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• 2022

Multiview stereo (MVS) 3D reconstruction of a scene from images is a fundamental computer vision problem that has been thoroughly researched in recent times. Traditionally, MVS approaches create dense correspondences by constructing regularizations and hand-crafted similarity metrics. Although these techniques have achieved excellent results in the best Lambertian conditions, traditional MVS algorithms still contain a lot of artifacts. Therefore, in this study, we suggest using a transformer network to accelerate the MVS reconstruction. The network is based on a transformer model and can extract dense features with 3D consistency and global context, which are necessary to provide accurate matching for MVS.

• ETRI Journal
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• 제44권6호
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• pp.1034-1046
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• 2022

The learning-based multiview stereo (MVS) methods for three-dimensional (3D) reconstruction generally use 3D volumes for depth inference. The quality of the reconstructed depth maps and the corresponding point clouds is directly influenced by the spatial resolution of the 3D volume. Consequently, these methods produce point clouds with sparse local regions because of the lack of the memory required to encode a high volume of information. Here, we apply the atrous spatial pyramid pooling (ASPP) module in MVS methods to obtain dense feature maps with multiscale, long-range, contextual information using high receptive fields. For a given 3D volume with the same spatial resolution as that in the MVS methods, the dense feature maps from the ASPP module encoded with superior information can produce dense point clouds without a high memory footprint. Furthermore, we propose a 3D loss for training the MVS networks, which improves the predicted depth values by 24.44%. The ASPP module provides state-of-the-art qualitative results by constructing relatively dense point clouds, which improves the DTU MVS dataset benchmarks by 2.25% compared with those achieved in the previous MVS methods.

• 한국측량학회지
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• 제40권5호
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• pp.439-448
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• 2022

MV (Moving Vehicle) detection using satellite imagery is important for traffic monitoring and provides a wide range of observations. Specifically, MV detection methods utilizing the time lag in single-pass optical satellite images have been studied for detecting MVs from a single set of images. Because of limitations in detecting MVs outside of roads, most previous studies required road information to limit the moving object to cars on the road. However, it is difficult to obtain road information from inaccessible areas. Therefore, this study proposed a new method for detecting MVs regardless of their locations from single-pass optical satellite images without using additional data. WV-3 (Worldview-3) satellite images were used, and a spatial correlation coefficient map was proposed to detect spatial displacement which denotes MVs across two WV-3 MS images. Finally, evaluation was performed through quantitative metrics and visual inspection. The evaluation results revealed that the proposed method can detect MV movements from the single-pass satellite images. On the contrary, misdetected or undetected MVs due to radiometric differences between the images could be identified by visual inspection. The performance of the proposed method can be improved by minimizing radiometric variations and adding conditions that are robust to radiometric differences between the images.

• 전자공학회논문지
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• 제50권6호
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• pp.72-81
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• 2013

본 논문에서는 기존 Multi-Vision System(MVS)에서 지원되지 않았던 N-스크린 서비스를 구현하기 위한 시스템 구조와 시스템과 사용자간의 인터랙션 방안을 제안한다. MVS의 N-스크린 서비스는 사용자가 다양한 단말들을 사용하여 자유로운 위치에서 MVS 디스플레이를 제어하고 MVS의 컨텐츠를 연속성 있게 공유할 수 있게 한다. 본 논문에서는 MVS에서 N-Screen Service 의 인터랙션 서비스를 지원하기 위해 관리 서버와 에이젼트를 도입한 서비스 방안을 제안한다. 그리고, 어플리케이션 실행, 서비스 제어를 위한 사용자 인터렉션 그리고 N-스크린 서비스를 지원하기 위한 비주얼 캐스팅 등을 위한 몇 가지 프로토콜의 예를 제시한다. 추가적으로, N-스크린 세션 분할, 그리고, 위치에 구애 받음 없이 사용 중인 사용자의 다양한 단말을 사용한 메타데이타 컨텐츠 실행 등을 위한 프로토콜을 사용한 N-스크린 서비스 시나리오도 예로서 기술한다. 시뮬레이션 결과는 제안 된 메커니즘의 적합성과 성능개선을 보여준다.

• 한국심리학회지 : 문화 및 사회문제
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• 제24권3호
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• pp.385-410
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• 2018

물질주의 가치 추구는 한국인의 정신건강 및 심리적 안녕감을 이해하는 데 중요한 변인일 수 있다. 이 연구는 물질주의 연구를 활성화하고 신뢰로운 측정을 하고자 물질주의 가치 척도로 가장 자주 사용되는 Richins와 Dawson(1992)의 물질주의 가치 척도(Material Values Scale)를 한국어로 번안하여 타당화하기 위해 실시하였다. 연구 1은 번안한 한국판 물질주의척도의 요인구조를 확인하고 신뢰도 및 타당도를 검증하였다. 이를 위해 대학생 417명(표본 1)을 대상으로 확인적 요인분석을 실시하였고, 그 결과 원척도의 요인과 동일한 3요인을 확인하였다. 원척도가 제시한 하위요인을 한국어로 번역하여 성공판단, 소유중심, 행복추구라 명명하였다. 이 과정에서 요인부하량이 낮은 3개의 문항은 물질주의 가치 척도의 다른 언어로의 타당화 연구를 참조하여 삭제하였고, 총 15문항으로 한국판 물질주의척도를 구성하였다. 연구 2에서는 표본 1과 유사한 성격을 지닌 대학생 650명(표본 2)을 대상으로 한국판 물질주의척도를 검증한 결과 수렴 및 변별타당도, 동시타당도, 예측타당도가 양호한 것으로 밝혀졌다. 또한 경제활동을 하는 직장인 392명(표본 3)과 대학생(표본 2)을 대상으로 다집단 요인분석을 실시한 결과 한국판 물질주의척도를 대학생과 직장인에게 동일하게 사용할 수 있는 것으로 나타났다. 직장인(표본 3)을 대상으로 검증한 결과 예측타당도가 양호한 것으로 나타났다. 여자 대학생 408명(표본 4)을 대상으로 6개월 간격으로 설문을 실시한 결과 검사-재검사 신뢰도 또한 양호한 수준으로 확인되었다. 이러한 결과는 한국판 물질주의척도가 성인을 대상으로 한 개인의 물질주의 가치 수준을 신뢰롭고 타당하게 평가하는 도구임을 의미한다.