• 한국전자파학회논문지
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• 제30권3호
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• pp.209-214
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• 2019

본 논문에서는 전도성 천으로 920 MHz UHF(Ultra High Frequency) 대역의 RFID(Radio Frequency IDentification) 태그 안테나를 설계하였다. 4가지의 전도성 천의 저항을 측정하여 각 천의 전도율을 계산하였고, UHF 대역의 RFID 태그 안테나로서 사용가능한 가장 좋은 전도율을 가지는 천을 선별하였다. 태그 안테나를 설계하기 위하여 선별된 천의 전도율을 시뮬레이션 프로그램에 입력하여서, T-Matching 구조를 갖는 UHF 대역 RFID 태그 안테나를 시뮬레이션을 통하여 $80{\times}40mm$ 명찰 크기로 설계 제작하였다. 태그의 시뮬레이션 결과와 측정 결과를 비교하였으며, 세탁성 테스트를 완수하였다. 제작된 태그의 인식거리는 약 2 m이다. 전도성 천을 이용하여 태그를 제작하면 직물이나 옷에 접착이 용이하므로 RFID 출입관리 시스템 등에 쉽게 적용이 가능하다.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제2권1호
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• pp.89-93
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• 2002

This paper introduces a vision-based on-line fabric inspection methodology of woven textile fabrics. Current procedure for determination of fabric defects in the textile industry is performed by human in the off-line stage. The advantage of the on-line inspection system is not only defect detection and identification, but also 벼ality improvement by a feedback control loop to adjust set-points. The proposed inspection system consists of hardware and software components. The hardware components consist of CCD array cameras, a frame grabber and appropriate illumination. The software routines capitalize upon vertical and horizontal scanning algorithms characteristic of a particular deflect. The signal to noise ratio (SNR) calculation based on the results of the wavelet transform is performed to measure any deflects. The defect declaration is carried out employing SNR and scanning methods. Test results from different types of defect and different style of fabric demonstrate the effectiveness of the proposed inspection system.

• 인터넷정보학회논문지
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• 제20권2호
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• pp.61-68
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• 2019

대부분의 인터넷 서비스를 손쉽게 이용할 수 있다는 장점으로 인해 스마트폰 사용자가 지속적으로 증가하고 있으나, 위조앱이 급증하고 있어 스마트폰 내부에 저장된 개인정보가 외부로 유출되는 문제점이 발생하고 있다. Android 앱은 자바 언어로 개발되었기 때문에 디컴파일 과정을 수행한 후 리패키징 취약점을 역이용할 경우 손쉽게 위조앱을 만들 수 있다. 물론 이를 방지하기 위해 난독화 기술을 적용할 수 있으나 대부분의 모바일 앱에는 미적용 상태로 배포되고 있으며, 안드로이드 모바일 앱에 대한 리패키징 공격을 근본적으로 차단하는 것은 불가능하다. 또한 스마트폰 내에 앱을 설치하는 과정에서 위조 여부를 자체 검증하는 기능을 제공하지 않아 스마트폰내 저장된 개인정보가 외부로 유출되고 있다. 따라서 이를 해결하기 위해 Hyperledger Fabric 블록 체인 프레임 워크를 사용하여 정상앱 등록 과정을 구현하고 이를 기반으로 효율적으로 위조앱을 식별 및 탐지할 수 있는 메커니즘을 제시하였다.

• 한국의류학회지
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• 제34권11호
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• pp.1798-1811
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• 2010

This research evaluates the changes in the comfort-related properties of high-density fabric, such as moisture permeability and waterproofness, in order to assess the relative importance of laundry conditions for clothing properties after repeated laundering and suggest the best laundering conditions for high-density fabric through the identification of the most influential factor. A commercial high-density fabric was washed 25 times in a drum-type washer using nine different laundry conditions based on profiles derived from a fractional factorial design. To evaluate the changes in the comfort-related properties of the fabric, pore size, air permeability, water vapor transport, water repellency, and water resistance were measured. The comfort-related properties of the fabric deteriorated after repeated laundering by the damaged surface finish; in addition, the damaged surface also changed the pore size. As a result, the water repellency and water resistance decreased. The detergent was the most responsible factor to change the properties among the four factors of detergent, hardness, temperature, and RPM. The best laundering conditions for the fabric was a neutral detergent, soft water of 70ppm, a temperature of $15^{\circ}C$, and 30rpm.

• 복식
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• 제47권
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• pp.89-100
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• 1999

This study was carried to a textile conservation process included washing effect fiber analysis such as fiber identification fabric density and thickness color fading and of extracted soils. the following results were obtained. 1. AS a result of investigating to fabric surfaces by S.E.M all of cleaning methods wet cleaning-solvent cleaning in charge system were effective to remove soils from fabrics. 2. The buried fabrics were made of silk few of them were cotton ramie and hemp. 3. According to fabric density and thickness used fabrics were almost medium weight fabrics. 4. Low values of L, a, b indicated that the colors of these fabrics were faded to yellow and brown. 5. The soil components were hydrocarbon-alkane group alkyl alcohol and ketone group.

• 한국소음진동공학회논문집
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• 제26권4호
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• pp.375-382
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• 2016

The mechanical property of a carbon-fiber-reinforced plastic (CFRP) is subjected to two elements, carbon fiber and polymer resin, in a first step and the selection of multi-layered structure is second one. Many combination of fabric layers, i.e. plainweave, twillweave, can be derived for candidates of test specimen used for a basic mechanical components so that a reliable identification of dynamic nature of possible multi-layered structures are essential during the development of CFRP based component system. In this paper, three kinds of multi-layered structure specimens were prepared and the dynamic characteristics of service specimens were conducted through classical modal test process with impact hammer. In addition, the design sensitivity analysis based on transmissibility function was applied for the measured response data so that the response sensitivity for each resonance frequency were compared for three CFRP test specimens. Finally, the evaluation of CFRP specimen over different multi-layered fabric structures are commented from the experimental consequences.

• 사물인터넷융복합논문지
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• 제6권4호
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• pp.65-72
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• 2020

본 논문에서는 지속적으로 급증하고 있는 안드로이드 악성 앱을 자동적으로 판별하기 위해 머신러닝 기법을 적용하여 프라이빗 블록체인을 토대로 웹 기반 DApp 시스템을 개발하였다. 공인 실험 데이터를 대상으로 안드로이드 악성 앱 판별에 96.2587% 정확도를 제공하는 최적의 머신러닝 모델을 선정하였고, 안드로이드 악성 앱에 대한 자동 판별 결과를 Hyperledger Fabric 블록체인 시스템 내에 자동적으로 기록/관리하였다. 또한 적법한 권한이 부여된 사용자만이 블록체인 시스템을 이용할 수 있도록 웹 기반의 DApp 시스템을 개발하였다. 따라서 본 논문에서 제시한 머신러닝 기반 안드로이드 악성 앱 판별 블록체인 DApp 시스템 개발을 통해 안드로이드 모바일 앱 이용 환경에서의 보안성을 더욱 향상시킬 수 있으며, 향후에 일반적인 범용 데이터를 대상으로 머신러닝과 블록체인을 결합한 보안 서비스로 발전시킬 수 있을 것으로 기대된다.

• 한국의류학회지
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• 제23권8호
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• pp.1161-1169
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• 1999

This research was aimed to identify the artifact type and their characteristics of the textile related materials excavated from Koryo Dynasty tombs of Hyungok-ni Danyang. Microscopy solubility test energy dispersive X-ray spectroscopy(EDS) and fourier transform infrared spectroscopy (FT-IR) fabric density test were used for the identification and when necessary standard samples were made in order to compare its characteristics with hose of the original artifact, the result indicated that the artifacts included both textile and paper. Artifacts from Burial 14 were comprised of textile fragments FT-IR and the solubility test conducted on the artifact indicated that the textiles were made with ramie woven with plain weave technique in a fairly loose fabric density. Rest of the artifacts were all comprised of paper.

• 인터넷정보학회논문지
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• 제21권1호
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• pp.95-102
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• 2020

본 논문은 허가형 블록체인 시스템 기반의 헬스케어 데이터 통합 관리 및 공유 플랫폼을 소개한다. 여기서 허가형 블록체인 시스템은 하이퍼레저 패브릭을 활용한다. 하이퍼레저 패브릭을 이용하여, 환자가 본인의 데이터에 쉽게 접근할 수 있고, 기관들은 그들이 필요로 할 때 동의하에 환자 데이터를 공유할 수 있으며, 데이터 공유를 해준 환자가 보상받는 구조이다. 헬스케어 데이터는 비식별 처리 통해 블록체인에 저장되며, 저장된 데이터에 대한 자세한 접근 권한을 설정하여 환자의 개인 정보를 보호한다. 본 논문에서 제안한 모델은 퍼블릭 블록체인에서 사용되는 다른 모델에 비해 강화된 보안을 제공한다. 또한, 기존 데이터를 저장하는 방법과 본 연구에서 블록체인에 저장된 데이터를 비교함으로써 환자 데이터를 보다 안전하게 저장할 수 있음을 확인한다.

• 한국의류학회지
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• 제40권3호
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• pp.456-464
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• 2016

A new combat uniform is improved for added combat safety with various functions such as survivability, battle conformity and a camouflage performance system. Camouflage performance is an important factor in terms of combat survivability since it makes identification difficult and provide security. The combat uniform is worn under extreme conditions (exposure to ultraviolet light, sweat and friction) and an excellent color fastness to repeated washing is required. In this study, we investigated the color management, durability and discoloration of new combat uniform fabric with a digital pattern for camouflage performance to provide preliminary color management data. We examined color differences between standard fabric and mass-produced combat uniform fabrics, color differences between each military supply contract firm and color changes in combat uniforms after 60 washing cycles. The slight color differences between standard fabric and mass-produced combat uniform fabrics were tolerable under quality criteria of Republic of Korea Ministry of National Defense. However, the differences between the military supply contract firms were recognizable to the naked eye and increased with repeated washing. Continuous research on color fastness under repeated washing and color management is required to standardize reliability from each military supply contract firm for the daytime performance of a combat uniform's camouflage.