지식기반 3D 통합모델링을 활용한 모바일하버 시뮬레이션 플랫폼

이승신(Seungsin Lee),서효원(Hyowon Suh) (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1

Mobile harbor is a novel type harbor system that can be moved out to the outside of general harbor to allow large container ships to unload cargo without having to come into port. The mobile harbor system is developed to reduce the time ships are required to remain at harbor and to build harbors capable of receiving large ships regardless of depth and tides. However, the mobile harbor consists of many complex components such as stabilized crane system at the sea, transfer unit, high speed container handing system at the quay, etc. and they must be evaluated as a integrated system for optimal construction of the mobile harbor. In this paper, efficiently integrated 3D simulation platform for mobile harbor is developed with Siemens NX and Plant Simulation which are well known general purpose PLM software, for evaluation of the various performances of the mobile harbor. To show effectiveness of the developed simulation platform, the one feasible arrangement of the mobile harbor from various alternatives is selected and simulation result is carried out. The simulation result shows that the developed simulation platform can be adopted to evaluate performances of the mobile harbor.

UV Protective Properties of Nonwoven Fabrics for Clothing and Analysis of the Influential Factors

이승신(Seungsin Lee) 한국생활환경학회 2009 한국생활환경학회지 Vol.16 No.2

자외선에의 과도한 노출은 광노화(photoaging), 피부암 등의 피부질환 및 건강 장해를 유발한다. 일회용 작업복 소재로 부직포 사용이 크게 증가함에 따라, 부직포 작업복을 착용하고 직사광선 하에 장시간 작업해야 하는 작업자들에게 자외선으로부터 안전한 의복 환경을 제공하기 위해, 이들 부직포의 자외선 차단 성능 및 이에 영향을 미치는 영향요인의 분석이 요구된다. 본 연구에서는 의류 용도로 사용되고 있는 12종의 부직포에 대해 자외선 차단 성능을 평가하고, 간단하고 측정이 용이한 직물 변인을 이용하여 자외선 투과율을 예측하는 통계 모델을 개발하고자 하였다. 부직포 12종에 대해 무게 및 두께를 측정하였고, 이에 근거하여 부직포의 openness를 나타낼 수 있는 변인으로 solid volume fraction을 산출하였다. 이들 직물 변인을 이용하여 다중다항식 회귀분석을 수행하였다. 현재 의류용으로 사용되고 있는 부직포는 다양한 정도의 자외선 차단 성능을 나타냈는데 12종의 부직포 중 7종의 소재가 15 이하의 UPF(Ultraviolet Protection Factor) 값을 나타내 자외선 차단 능력이 매우 낮은 것으로 나타났다. 다중다항식 회귀분석 결과, 두 가지 직물 변인인 직물 무게와 solid volume fraction을 이용하여 UV-A와 UV-B 투과율을 예측할 수 있는 통계 모델을 개발하였으며, R²는 각각 0.91과 0.96으로 나타났다. 이는 매우 간단하고 측정이 용이한 직물 변인을 이용하여 부직포에 대한 자외선 투과율을 예측하는 것이 가능함을 의미한다. Prolonged exposure to ultraviolet radiation (UVR) can cause permanent damage to skin and is believed to be responsible for the development of skin cancers. As the use of nonwoven fabrics for protective garments for outdoor workers continues to increase, it is necessary to provide information on UV-protective properties of nonwoven fabrics in order to provide a safe working environment for outdoor workers from UV radiation. The objectives of this study are to characterize UV-protective properties of nonwoven fabrics currently available for protective garments and to explore fabric parameters affecting the UVR transmission through nonwoven fabrics. Also, a statistical model that estimates UVR transmission of nonwoven fabrics using simple fabric parameters is developed. Twelve nonwoven fabrics commercially available for clothing were selected, and the fabric weight and thickness were measured. Solid volume fraction was calculated based on the fabric measurements. Statistical analyses were performed to examine the relationship between fabric parameters and UVR transmission through nonwoven fabrics. Nonwoven fabrics available for clothing exhibited a wide range of ultraviolet protection factor (UPF) values. More than half of the nonwoven fabrics provide little protection against UV radiation. Statistical models estimating the level of UV-A and UV-B transmission were developed using two significant fabric parameters, fabric weight and solid volume fraction. The R² values for models developed for UV-A and UV-B transmission were 0.91 and 0.96, respectively. These findings could be useful in providing recommendations for selecting nonwoven fabrics for protective garments for outdoor workers.

Effects of Structural Parameters of Woven Fabrics on UV Protective Properties

Seungsin Lee(이승신) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.2

오존층 파괴로 인해 지구 표면에 도달하는 자외선량이 점차 증가하고 있으며, 자외선에의 과도한 노출은 광노화(photoaging), 피부암 등의 피부질환 및 건강 장해를 유발한다. 의류소재는 자외선으로부터 피부를 보호하는, 간단하고 효과적인 수단이나, 다양한 요인에 의해 자외선 차단 성능에 차이를 나타낸다. 본 연구에서는 직물의 자외선 차단 성능에 영향을 미치는 구조 변인을 규명하고, 이들 직물 구조 변인을 이용하여 자외선 투과율을 예측하는 통계 모델을 개발하고자 하였다. 다양한 무게, 두께, 조직을 갖는 13종의 직물에 대해 무게, 두께, 직물 밀도, 실의 번수, 직경, 꼬임수 등 기본적인 특성을 측정하고, 이에 근거하여 실간 공극(interyarn spacing), 섬유간 공극(interfiber spacing) 등 직물의 복잡한 구조적 특성 및 openness를 나타낼 수 있는 변인으로 fabric cover factor, yarn twist factor, solid volume fraction을 산출하였다. 이들 직물 구조 변인을 이용하여 다중다항식 회귀분석을 수행하였다. 직물 구조 변인들은, 직물의 자외선 차단 성능을 결정하는 주요한 영향 요인으로 나타났다. 다중다항식 회귀분석 결과, 직물 무게, solid volume fraction, yarn twist factor를 이용하여 UV-A 투과율을 예측할 수 있는 통계 모델을 개발하였고 R²는 0.92로 나타났다. UV-B 투과율을 예측할 수 있는 통계 모델은 직물 무게, 두께, solid volume fraction, cover factor를 이용하여 개발하였으며, R²는 0.91로 나타났다. 본 연구 결과는 자외선 차단 성능이 높은 직물을 설계하는 데에 유용한 기초 자료로 활용될 수 있을 것이다. Stratospheric ozone depletion causes increased levels of ultraviolet radiation on earth, and overexposure to ultraviolet radiation (UVR) is believed to be the major cause of skin cancer. Clothing materials provide simple and effective means to protect skin from UV radiation, but they offer different degrees of UV radiation protection depending on various factors. The objectives of this study are to explore structural parameters that are critical in the UVR transmission of woven fabrics and develop statistical models that predict UVR transmission through woven fabrics using those parameters. Thirteen woven fabrics with various fabric weight, thickness, and construction were selected, and the UV protective properties were measured. Textile structural parameters, such as fabric cover factor, solid volume fraction, and yarn twist factor, that could estimate fabric openness and describe the complex geometric structure of woven fabrics were computed from basic fabric characteristics. Statistical analyses were performed to examine the relationship between structural parameters and UVR transmission through woven fabrics. It was found that structural parameters have a dominant effect on UVR transmission of woven fabrics. A statistical model predicting the level of UV-A transmission was developed based on fabric weight, solid volume fraction, and yarn twist factor, with an R2 value of 0.92. A statistical model estimating the level of UV-B transmission was developed using fabric weight, thickness, solid volume fraction, and cover factor, with an R² value of 0.91. These findings could be useful for engineering woven fabrics with high UV radiation protection.

소셜네트워크서비스 정보 특성을 통한 소셜미디어의 가치와 사용의도에 관한 연구

이영희(Lee, Younghee),이승신(Lee, Seungsin),이석형(Lee, Seokhyoyng),박정근(Park, Jungkun) 한국소비문화학회 2015 소비문화연구 Vol.18 No.4

최근 소셜미디어와 SNS는 우리생활의 많은 영역에서 다양하게 활용되고 있다. 이러한 환경에서 본 연구에서는 SNS에서 흐르는 정보 특성과 소비자가 소셜미디어를 통하여 얻는 가치를 구분하여 살펴보고, 소비자의 소셜미디어의 사용의도에 주는 영향을 확인하고자 한다. 연구를 위한 조사는 성인소비자 402명을 대상으로 실시하였으며, SPSS 22.0을 사용하여 빈도분석, 탐색적요인분석(Exploratory Factor Analysis), t-검증, 일원분산분석, 사후 검증(DMR검증), 상관관계(Correlation), 다중회귀분석(Multiple Regression Analysis), 경로분석(Path Analysis)을 실시하였다. 연구결과 SNS 정보 특성은 내용적합성과 활용용이성으로 구분되었으며, 소비자들은 소셜미디어를 통하여 얻을 수 있는 가치를 목적가치와 오락가치 두가지 차원으로 인식하고 있었다. 더불어 소셜미디어의 목적가치와 오락가치는 소셜미디어의 사용의도에 정적인 영향을 미치는 것으로 나타났다. 또한 SNS 정보 특성은 소셜미디어의 목적가치와 오락가치를 통하여 직․간접적으로 소셜미디어의 사용의도에 영향을 미치는 결과를 보였다. 특히 SNS 정보 특성 중 내용적합성은 소셜미디어 사용의도에 직접적으로 영향을 주는 것으로 나타나 적합한 정보전달을 위한 정보내용의 검증단계가 반드시 필요하며, 이를 통하여 적합한 정보가 소비자들에게 전달됨으로써 정보 선택과 관련된 소비자 문제를 해결하는데 도움이 될 수 있을 것으로 기대된다. 더불어 기업에서는 소셜미디어를 통하여 소비자들에게 목적가치와 오락가치를 충족시킴으로써 지속적인 소비자들과의 소통과 마케팅수단으로 소셜미디어의 활용이 가능할 것으로 사료된다. Nowadays social media and SNS (Social Network Service) are being diversely utilized in various area of our lives. The purpose of this study is to examine the characteristics of information transmitted over SNS and the value that consumers create through social media. The study is also to explore the effects of social media information on consumers’ usage intention of social media. The sample of this research were 402 adult consumers, and SPSS 22.0 was employed to perform frequency analysis, exploratory factor analysis, t-test, one-way ANOVA, post-test, correlation, multiple regression analysis, and path analysis. The results indicate the information characteristics of SNS are divided into contents accuracy/ usability, and purposive/entertaining value through social media. Also, it has been found that the purposive value and entertaining value of social media exert positive effects on the usage intention of social media. In addition, the information characteristics of SNS indicate effects on the usage intention of social media both directly and indirectly with the mediation of social media’s purposive and entertaining value. Especially contents accuracy from information characteristics of SNS has direct effects on the usage intention on social media; thus, it will be needed to secure steps to verify the contents of information to deliver accurate information. It is expected that this will help to solve consumer problems related to information selection by delivering accurate information to consumers. For managerial implications it is thought that they can satisfy consumers’ purposive and entertaining value through social media and can use social media as a means of marketing as well as constant communication with their consumers.

소비자의 CCM(Consumer Centered Management)인증 기업 제품 구매의도에 관한 연구

이제호(Lee, Jeho),이승신(Lee, Seungsin) 한국소비자원 2016 消費者問題硏究 Vol.47 No.1

해외직구에 대한 소비자태도 및 이용의도에 관한 연구- 확장된 기술수용모델을 중심으로

이영희 ( Younghee Lee ),류미현 ( Mihyun Ryu ),이승신 ( Seungsin Lee ) 한국소비자학회 2015 소비자학연구 Vol.26 No.5

본 연구는 해외직구에 대한 실증적 연구로서 소비자들의 해외직구 이용의도를 구조적으로 알아보고자 기술수용모델을 근거로 하여 살펴보았다. 연구에서 사용된 변수는 외부변수인 사회적 영향, 정보탐색, 그리고 해외직구의 지각된 이용용이성, 지각된 유용성, 태도, 이용의도로 구성하였다. 연구의 결과는 외부변수인 사회적 영향과 정보탐색은 해외직구에 대한 지각된 이용용이성과 지각된 유용성에 정적인 영향을 주는 것으로 나타났으며, 사회적 영향력이 정보탐색보다 해외직구에 대한 지각된 이용용이성과 지각된 유용성에 더 큰 영향을 주는 것으로 나타났다. 또한 해외직구에 대한 지각된 유용성과 이용용이성은 해외직구에 대한 태도에 긍정적인 영향을 미치는 것을 알 수 있었다. 마지막으로 해외직구 이용의도에 소비자들의 해외직구에 대한 긍정적인 태도의 형성이 중요함을 확인하였다. 따라서 해외직구의 용이하고 안전한 이용을 위하여 우리나라 소비자들의 실정에 맞고, 이용 및 정보격차로 인한 피해가 없도록 유용하고 효과적인 해외직구 관련 정보제공 방안이 필요하다. 이를 통하여 해외직구에 대한 긍정적인 태도의 구축과 이용이 증가할 수 있을 것으로 기대된다. 더불어 본 연구결과는 국내 쇼핑사이트에서도 역직구 및 국내소비자의 이용을 높일 마케팅 전략수립 시 중요한 자료로 활용할 수 있을 것이다. Based on the technology acceptance model, this empirical study investigated consumer usage intentions for overseas direct online shopping. The variables in this study included perceived ease of use, perceived usefulness, attitudes and usage intentions toward overseas direct online shopping, as well as two external variables, social influences and information search. The findings showed that the two external variables, social influence and information search, had a static influence on the perceived ease of use and usefulness of overseas direct online shopping. In this regard, social influence had a greater effect than did information search. In addition, perceived usefulness and ease of use had a positive effect on consumer attitudes toward overseas direct online shopping. Lastly, the study confirmed that the formation of positive consumer attitudes toward overseas direct online shopping was necessary to consumer usage intentions for shopping. Thus, an effective plan is required for providing information regarding overseas direct online shopping that best suits Korean customer requirements and avoids potential damage from shopping usage and the digital divide in order to encourage easy and safe overseas direct online shopping. This approach is expected to improve the formation of positive customer attitudes toward overseas direct online shopping and its usage. Furthermore, the findings of this study will contribute to establishing the marketing strategies of Korean shopping sites for reverse overseas direct online shopping and increased usage of Korean customers.

공축 전기방사를 이용한 Core-Sheath형 복합나노섬유의 제조

강민정 ( Minjung Kang ),이승신 ( Seungsin Lee ) 한국의류학회 2013 한국의류학회지 Vol.37 No.2

This study investigates the fabrication of core-sheath nanocomposite fibers by locating germanium (Ge) and silicon dioxide (SiO₂) nanoparticles selectively in the sheath layer by co-axial electrospinning. Co-axially spun fibers were prepared by electrospinning a pure PVA solution and Ge/SiO₂/PVA solution as the core and sheath layer respectively. Core-sheath nanocomposite fibers were electrospun under a variety of conditions that include various feed rates for the core and sheath solutions voltages and concentric needle diameters in order to find an optimum spinning condition. Ge/SiO₂ nanocomposite fibers were also prepared by uni-axial electrospinning to compare fiber morphology and nanoparticle distribution with core-sheath nanofibers. Using scanning electron microscopy transmission electron microscopy and energy dispersive X-ray analy-sis it was demonstrated that the co-axial approach resulted in the presence of nanoparticles near the surface region of the fibers compared to the overall distribution obtained for uni-axial fibers. The co-axially elec-trospun Ge/SiO₂/PVA nanofiber webs have possible uses in high efficiency functional textiles in which the nanoparticles located in the sheath region provide enhanced functionality.

TiO₂ 함유 복합나노섬유의 메틸렌 블루 광분해 특성

정태영(Taeyoung Jeong),이승신(Seungsin Lee) 한국생활환경학회 2015 한국생활환경학회지 Vol.22 No.2

This study investigated the incorporation of nanoscale titanium dioxide (TiO₂) particles, a well-known photocatalyst, into poly(vinyl alcohol) (PVA) nanofibers via electrospinning for the development of self-cleaning textile materials that can decompose organic contaminants and stains on the textile surface by light irradiation. TiO₂/PVA nanocomposite fiber webs were fabricated from a PVA solution containing 5wt% TiO₂ nanoparticles at a web area density of 3.0g/㎡. The morphology of electrospun nanocomposite fibers was examined using a field-emission scanning electron microscope and a transmission electron microscope. The photocatalytic decomposition efficiency of the nanocomposite fibers was examined by decomposition rates of methylene blue in aqueous solution under UV light irradiation. Also, the nanocomposite fibers were contaminated by methylene blue, and the color change of methylene blue on the fibers was assessed with time of light exposure. Methylene blue solution that contained TiO₂/PVA nanocomposite fibers exhibited much lower absorbance and thus gave a higher decomposition rate compared to that with pure PVA nanofiber webs after 12 hours of irradiation. TiO₂/PVA nanocomposite fibers contaminated by methylene blue also showed a photocatalytic property for the colorant after 24 hours of irradiation. The results indicate that TiO₂/PVA nanocomposite fiber webs have potential in medical textiles and automotive textiles that require self-cleaning properties.

리그닌/PVA 나노섬유 웹의 수분 특성 및 생분해성 평가

송유정 ( Youjung Song ),이은실 ( Eunsil Lee ),이승신 ( Seungsin Lee ) 한국의류학회 2017 한국의류학회지 Vol.41 No.3

The biodegradation and water absorption properties of lignin/poly(vinyl alcohol) (PVA) nanofibrous webs are investigated. Lignin/PVA nanofibrous webs containing 0, 50, and 85wt% of lignin were prepared via an electrospinning process to observe the effect of the lignin concentration on the biodegradability and water absorption properties of lignin/PVA nanofibrous webs. The morphology of the materials was examined by field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). To understand the wetting behavior and hydrophilic nature of the electrospun lignin/PVA nanofibrous webs, the water absorbency, contact angle, and water uptake were examined. The enzymatic degradation of lignin/PVA nanofibrous webs was investigated using laccase by measuring total organic carbon (TOC) concentration over a course of 50 days. Water drops were absorbed immediately into all of the specimens. The water uptake of lignin/PVA nanofibrous webs increased as the amount of PVA in the lignin/PVA hybrid webs increased. The enzymatic degradation experiment indicated that the inherent biodegradability of lignin was retained after its transformation into nanofibers. Our findings imply that blending these two types of polymers is promising because it can lead to the development of a new range of multifunctional materials such as antimicrobial absorbent nanotextiles based on sustainable biopolymers.

온라인 교육 서비스에서 부정 시청 방지를 위한 사용자 인증 시스템 제안

김민지(Minji-Kim),이세은(Seeun-Lee),이승신(Seungsin-Yi),정명주(Myeongju-Jung),백호기(Hoki Baek) 한국방송·미디어공학회 2021 한국방송공학회 학술발표대회 논문집 Vol.2021 No.11