• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.390-390
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• 2000

This research is the development of a skin-type tactile sensor for service robot using PVDF film for the detection of the contact state. The Prototype of the tactile sensor which has 8$\times$8 taxels was fabricated using PVDF film In the fabrication procedure of the sensor, the electrode patterns and common electrode of the thin conductive tape were attached to the both side of the 28 micro meter thickness PVDF film using conductive adhesive. The sensor was covered with polyester film for insulation and attached to the rubber base for making stable structure. The signals of a contact pressure to the tactile sensor were sensed and processed in the DSP system in which the signals were digitized and filtered. Finally, the signals were integrated for taking the force profile. The processed signals of the output of the sensor were visualized in PC, the shape and force distribution of the contact object were obtained. The reasonable performance for the detection of contact state was verified through the experiment.

• Textile Coloration and Finishing
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• v.18 no.2 s.87
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• pp.39-45
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• 2006

The aim of this work is to develop sense-differentiated textiles using Thick-Thin polyester yarn(T-T yarn) with finer than 1 denier mono filament. The ITY(Interlace Textured Yarn) using T-T yarn with various over feed ratios of PET filament was manufactured with different shrinking percentage of core yarn and then the fabrics were woven on the same weaving 100m using ITY produced. The mechanical properties and the handles of the fabrics were examined with KES-FB system suggested by Kawabata. The shrinkage of ITY was increased with decreasing over feed ratio and increased with increasing heat treatment temperature of T-T yarn. The initial elasticity modulus of ITY was decreased with increasing over feed ratio and heat treatment temperature of T-T yarn. The tensile energy of fabrics was decreased with increasing of over feed ratio, but bending rigidity and shear rigidity of fabrics were increased with increasing of over feed ratio of PET filament. The results indicate that the fabric using T-T yarn with finer than I denier mono filament can be used for the purpose of sense-differentiated textile.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.5
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• pp.862-867
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• 2016

In this study, the embroidery textile conductive wire of conductive yarn was designed into the wearable integrated clothing for sensing the infant's body temperature. To develop a high quality of the stable fiber-based textile conductive wire, firstly the five types of conductive yarns were twisted or covering polyester yarns and the coated conductive fiber with silver(Ag) or iron(Fe). As a result of comparative conductivity in conductive yarns of yarn processing, the 250 denier of conductive yarns with $0.74{\Omega}$/1~5cm were proposed and used for the integrated embroidery textile conductive wire for sensing. During experiments using the proposed embroidery textile conductive wire, measured resistance of thermistor according to the body temperature was correctly delivered to amplifier module, and showed feasible reliability of temperature sensing. As a wearable application, conductive yarns which takes forms of embroidery textile conductive wire would seems to be reliable as a conductive wire and could be replaced by the conductive metal wires.

• Journal of the Korean Society of Clothing and Textiles
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• v.31 no.1 s.160
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• pp.77-84
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• 2007

The purpose of this study was to investigate and to compare the performances of silicone laminated materials sold for swimming cap in market, to get the basic data for product development. We selected 4 specimens and tested their air permeability, waterproofness and breathability. We also tested the physical and mechanical properties of the specimens using KES system. Silicone-laminated material was not bursted on high hydraulic pressure since silicone membrane gave waterproofness while PU/Polyester substrate gave elasticity. It didn't have air permeability and breathability at all. Any toxic materials such as Formaldehyde, Deldrin, PCP, Amin, TDBPP were not detected in silicone-laminated material and other materials. Silicone-laminated material had higher stretchability with the low force but it had lower elastic recovery and shape stability comparing to PU laminated material. It had lower flexibility than PU laminated material. It had lower unrecoverable amount in shearing direction. Friction coefficient was higher in silicone-laminated material than PU laminated material due to its surface stickiness. It was compressed easily and its compression resiliency was higher with compared to PU laminated material.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.8
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• pp.119-126
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• 2016

In this paper, we proposed the planar textile resonator for constructing wearable MR-WPT system and analyzed the characteristic of textile substrates used in resonators. The planar textile resonators were designed to resonate at 1-10 MHz. The loop and coil were fabricated planar structure on textile substrate using conductive materials. Polyester fiber and cotton widely used in real life were chosen as textile resonators for wearable applications and copper tape and silver paste were used for fabricating planar loop and coil on textile substrate. For comparison analysis on transfer efficiency according to the types of textile, transmitter and receiver parts were symmetric. According to the result, for the highest transfer efficiency of wearable WPT system, the planar resonators have specifications of relative thick textile substrate with low permittivity and low surface resistance of conductive pattern. The performed experiments show that the planar textile resonator is possible to be used for resonator in wearable MR-WPT system.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2012.03a
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• pp.73-73
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• 2012

본 연구에서는 리싸이클 방법에 따른 리싸이클 폴리에스터사의 물리적 성질을 고찰하고자 하였다. 시료로는 물리적 리싸이클 방법과 화학적 해중합을 통한 리싸이클 방법을 사용한 폴리에스터사를 사용하였다. 리싸이클 폴리에스터사의 표면 형상을 관찰하기 위해 SEM을 이용하였고, 열적 거동을 규명하기 위해 DSC를 이용하였으며, 미세 구조적 차이를 살펴보기 위해 XRD 분석을 하였고, 역학적 성질을 평가하기 위해 인장강도와 절단신도를 측정하였다. 연구 결과, 리싸이클 방법에 따라 Tg, 결정화 온도, 융점과 융해열은 약간의 차이를 보였다. 화학적 리싸이클 PET사는 Virgin PET사보다 Tg가 약간 상승하였고, 승온 시 결정화 온도는 하강하였으며, 융점의 차이는 거의 없는 것으로 나타났다. 이는 해중합에 의해 PET의 비결정영역의 고분자 사슬 간의 거리가 좁아져 더 높은 Tg를 나타내는 것으로 생각된다. 또한, 물리적 리싸이클 PET사의 융점과 융해열은 화학적 리싸이클 PET사의 융점과 융해열보다 더 높게 나타났다. 결정화도에서는 리싸이클 방법에 따른 차이는 거의 보이지 않았다. 이는 리싸이클 공정이 폴리에스터의 결정영역 변화에는 유의한 영향을 미치지 않았기 때문인 것으로 생각된다. 실의 인장강도는 리싸이클 PET사는 virgin PET사보다 약간 더 낮았고, 물리적 리싸이클 PET사와 화학적 리싸이클 PET사는 비슷하게 나타났고, 절단신도는 virgin PET사, 물리적 리싸이클 PET사와 화학적 리싸이클 PET사 간의 뚜렷한 차이는 없는 것으로 나타났다.

• The Journal of Korean Academy of Prosthodontics
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• v.42 no.2
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• pp.192-209
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• 2004

Purpose : The purpose of this study was to evaluate the machining accuracy and consistency of implant/abutment/screw combination or internal connection type. Material and methods: In this study, each two randomly selected internal implant fixtures from ITI, 3i, Avana, Bicon, Friadent, Astra, and Paragon system were used. Each abutment was connected to the implant with 32Ncm torque value using a digital torque controller or tapping. All samples were cross-sectioned with grinder-polisher unit (Omnilap 2000 SBT Inc) after embeded in liquid unsaturated polyester (Epovia, Cray Valley Inc). Then optical microscopic and scanning electron microscopic(SEM) evaluations of the implant-abutment interfaces were conducted to assess quality of fit between the mating components. Results : 1) Generally, the geometry of the internal connection system provided for a precision fit of the implant/abutment into interface. 2) The most precision fit of the implant/abutment interface was provided in the case of Bicon System which has not screw. 3) The fit of the implant/abutment interface was usually good in the case of ITI, 3I and Avana system and the amount of fit of the implant/abutment interface was similar to each other. 4) The fit of the implant/abutment interface was usually good in the case of Friadent, Astra and Paragon system. The case of Astra system with the inclined contacting surface had the most Intimate contact among them. 5) Amount of intimate contact in the abutment screw thread to the mating fixture was larger in assembly with two-piece type which is separated screw from abutment such as Friadent, Astra and Paragon system than in that with one-piece type which is not seperated screw from abutment such as ITI, 3I and Avana system. 6) Amount of contact in the screw and the screw seat of abutment was larger in assembly of Friadent system than in asembly of Astra system of Paragon system. Conclusion: Although a little variation in machining accuracy and consistency was noted in the samples, important features of all internal connection systems were the deep, internal implant-abutment connections which provides intimate contact with the implant walls to resist micro-movement, resulting in a strong stable interface. From the results of this study, further research of the stress distribution according to the design of internal connection system will be required.

• Journal of Dental Rehabilitation and Applied Science
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• v.24 no.1
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• pp.77-89
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• 2008

The purpose of this study was to evaluate internal conical abutment sinking and fitness according to the loading condition. In this study, Alloden implant fixture and two abutment(conventional, FDI) systems were used. Each abutment was applied 1 time of finger force, 3 times of malleting force, 5 times of 20kg and extra several times to the fixture until the amount of abutment singking showed no change. Then, the length of abutment to fixture which was binding lightly with no pressure state was measured by Vernier caliper. After loading application, the length was remeasured and the amount of sinking was calculated. The implant was buried in unsaturated polyester (Epovia, Cray Valley Inc. Korea) for making a comparison between the change of length and fitness of abutment-fixture connection part. Then All samples were cross-sectioned with high speed precision cut-off(accutom-5, Struers, Denmark). Finally, The result were observed and analyzed using FE-SEM (field emission scanning electron microscopy).

• Journal of the Korea Fashion and Costume Design Association
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• v.18 no.1
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• pp.183-190
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• 2016

A mourning dress is the formal costume that the mourners wear to show civility during the mourning. Traditional funeral rites are the Confucianism's funeral proceeding where the mourners wear according to the National Mourning Dresses System. However, nowadays, the funeral proceedings and mourning dresses are simplified. In result of current design analysis of the mourning dresses for women, the types of the mourning dresses for women are classified by traditional styles and modern styles. Traditional styles include skits and Jeogori make of hemp fabrics, and modern styles include skits and Joegori style, modernized Hanbok style, and Western style, which consist of cardigan, waist skits, jackets, and pants. The modern styles mostly use polyester and the color consists mainly of black and white. The followings propose new designs of mourning dress for women that reflect practicality, flexibility, and diversity. First, transmit the meaning that traditional mourning dress entails Second, change the length and the width of Jeogori and skirt by reflecting the trend of the time and change the designs of the mourning dresses by using the details of the modern styles so that they are equipped with practicality, flexibility, and affordability. Third, pursue diversity by changing the uniformed fabrics and colors used on the existing mourning dresses. This study addresses the drawbacks and the points that need be improved to suggest the designs of the modern mourning dress for women, which reflect the characteristics of Hanbok and cultural traits.

• Journal of Sensor Science and Technology
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• v.23 no.5
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• pp.342-348
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• 2014

This paper introduced a novel multi-gas sensor detector with simple signal processing algorithm. This device was evaluated by investigating the characteristics of combustible materials using fire-generated smell and smoke. Plural sensors including TGS821, TGS2442, and TGS260X were equipped to detect carbon monoxide, hydrogen gas, and gaseous air contaminants which exist in cigarette smoke, respectively. Signal processing algorithm based on the difference of response times in fire-generated gases was implemented with early and accurately fire detection from multiple gas sensing signals. All fire experiments were performed in a virtual fire chamber. The cigarette, cotton fiber, hair, polyester fiber, nylon fiber, paper, and bread were used as a combustible material. This analyzing software and sensor controlling algorithm were embedded into 8-bit micro-controller. Also the detected multiple gas sensor signals were simultaneously transferred to the personnel computer. The results showed that the air pollution detecting sensor could be used as an efficient sensor for a fire detector which showed high sensitivity in volatile organic compounds. The proposed detecting algorithm may give more information to us compared to the conventional method for determining a threshold value. A fire detecting device with a multi-sensor is likely to be a practical and commercial technology, which can be used for domestic and office environment as well as has a comparatively low cost and high efficiency compared to the conventional device.