한지사 혼용직물의 접착심 접착 후 역학적 물성 변화

지주원 한국의류학회 2020 한국의류학회지 Vol.44 No.1

We selected 100% cotton fabric, 100% Hanji yarn fabric and two kinds of cotton / Hanji yarn blended fabrics and fused them with three kinds of interlinings in order to examine changes to the physical properties and the post-adhesion physical properties of Hanji yarn blended fabrics. Changes in KES values were examined after fusing. First, EM, B, 2HB, MMD values of Hanji yarn blended fabrics were higher than cotton fabric, and LT, RT, G, 2HG, LC, WC values of cotton fabric were higher than Hanji yarn blended fabrics. Tensile recovery was lowered, bending stiffness was increased, and shear stiffness was lowered when Hanji yarn was mixed. Second, the KES value of LT, B, 2HB, G, 2HG, LC, WC increased after fusing, while the EM, MMD values decreased. SMD was shown to decrease or increase depending on the type of fabric. The adhesive effect on bending stiffness and shear stiffness due to the mixing of Hanji shows a different tendency in the comparison of αB and αG.

레이저 프린터 정착 시스템의 열전달 해석을 통한 승온 성능 및 정착성 예측

이진성(Lee Jin-sung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

Thermal performance of fusing system in laser printer is determined by FPOT(First print out time) required and toner fusing quality. FPOT is influenced by the thermal resistance of fusing system between heat source and nip region. Also FPOT is depended by the heat source power and toner fusing temperature. The fusing quality of toner is decided by the temperature, pressure and duration time in nip region. In this study, I have performed thermal analysis for the toner fusing system. Computational simulation has been used to understand the effect of heat source power and printing speed etc. on the temperature distribution of the fusing system. Also in order to predict fusing quality, numerical simulation of the process that paper is continuously supplied to the nip regions were performed. In comparison with the experimental results of the fusing quality vs transferred calory to the toner layer, I could evaluate various fusing condition parameters effected on the thermal performance.

A Study on the Fusing Temperature Distribution for Laser Printer Toner by Using Numerical Computation

Choi, Yoon-Hwan,Lee, Yeon-Won,Kim, Dong-Kyun,Doh, Deog-Hee The Korean Society of Safety 2009 International Journal of Safety Vol.8 No.2

Fusing process of laser printer is the step to fuse toner on the paper and it has a great effect on fast printing speed, decrease in waiting time and improvement of printing quality. In order to improve the quality of fusing, a study on the fusion region is required. Recently, various researches are progressing in this field. In this study, the research about the temperature distribution of fusing region is performed through numerical analysis because fusing region is one of the important factors influencing fusing quality. According to results, it is ascertained that the temperature of fusing region is relative to velocity of the paper under print and has a regular distribution to width direction of the paper.

수치해석 및 실험적 방법에 의한 케이블의 단선 특성에 관한 연구

김재호(Jae-Ho Kim) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.11

In this study, the fusing current behavior of fire resistant wire and cables were analyzed for reduce the risk of cable functional failure and electrical fires. The cable fusing current and time were measured as a function of current ramping rates, and 10 ∼ 30 times of allowable current using AC and DC power supply with high accuracy DAQ measurement system. Also, the FEM simulation and theoretical calculations(Onderdonk’s and IEC 60364-434 equations) will be performed to determine the validity and reliability of the experimental results. It was determined that the decreasing fuse time was directly proportional to the increasing current ramping rate and multiples of allowable current. The fusing time of non-insulated wire was similar to Onderdonk’s and IEC 60364-434 equations. However, the fusing time of insulated wire is later than the non-insulated wire. The fusing time of the cable and insulated wire did not coincided well with the numerical equation because the numerical equation did not consider the insulation material. The experiment results of the cable fusing time coincided with FEM analysis results of model 3.

치과용 저온 및 초저온 용융형 도재의 파괴 특성 평가

송창용,배태성,박찬운 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.3

The purpose of this was to evaluate the fracture characteristics of dental low- and ultra low-fusing porcelains by Vickers indentation method. Three kinds of commercially available low-fusing porcelains of Ceramco (CN), Vintage (VT) and Omera 900 (ON) and three kinds of ultra low-fusing porcelains of Carmen (CM), Carrara (CR) and Finess (FN) were used as experimental materials. Disc specimens were prepared to the final dimensions of 12 mm in diameter and 2 ㎜ in thickness. Vickers indentations were made under a load range of 2.0∼9.8 N, and the hardness, fracture toughness and characteristic indentation dimensions were examined. The highest Vickers hardness value of 605.6 was obtained in the VT group and the lowest value of 544.8 was obtained in the CR group. Results of Tukey test showed that hardness values of the VT and CR groups were significantly different (p<0.05). The highest fracture toughness value of 1.06 MPa · m^1/2 was obtained in the VT group and the lowest value of 0.61MPa m^1/2 was obtained in the FN group. Results of Tukey test showed that an overall significant difference was indicated low-fusing porcelains were similar or inferior to those of low-fusing porcelains. The ratios of radial crack length c and of indentation load.

고등학교 융합형"과학"과목 운영에 대한 고등학생과 과학 교사의 인식 조사 연구

송신철 ( Shin Cheol Song ),홍보라 ( Bora Hong ),김남희 ( Nam Hui Kim ),한화정 ( Hwa Jung Han ),심규철 ( Kew Cheol Shim ) 경북대학교 과학교육연구소 2012 科學敎育硏究誌 Vol.36 No.1

본 연구에서는 고등학교 융합형 과학 과목 운영에 대한 고등학생과 과학 교사의 인식을 조사하여 비교 하고자 하였다. 조사도구는 융합형 과학 과목 운영의 필요성, 과학 과목의 수업 내용, 과학 과목의 수업 효과 등 3개 영역으로 구성되어 있다. 융합형 과학 학습보다는 분과적인 과학 과목의 운영을 선호하고 있었다. 융합형 과학 과목의 수업 내용이 일상생활과의 관련성, 수업 내용의 참신성, 융합형 과학 과목의 흥미등은 과학 교사들이 고등학생들에 비해 더 긍정적인반면 수업 내용의 이해에 대해서는 고등학생들이 더긍정적인 인식을 갖고 있었다. 그리고 융합형 과학 과목의 수업 효과 영역에서 고등학생들과 과학 교사들 은 융합형 과학 수업을 통해 첨단 과학이나 과학사,과학과 기술, 과학과 사회의 연관성 등에 대해서는 다소 긍정적인 인식을 갖게 된 것으로 나타났다. 그러나 과학 상식과 사회적 쟁점에 대한 관심에 영향을 주었다는 것에 대해서는 과학 교사들은 비교적 긍정적인인식을, 학생들은 다소 부정적인 인식을 갖고 있었다.과학의 가치, 과학적 탐구의 가치, 과학에 대한 관심등에 대해서 융합형 과학 수업이 영향을 끼쳤는가에 대해서는 과학 교사들이 고등학생들에 비해 더 부정적인 것으로 조사되었다. 또한 융합형 과학 수업이 과학 탐구 과정의 이해나 과학 글쓰기와 토론 활동, 과학적 사고력과 의사소통 능력의 함양에 미치는 영향에 대한 인식에서는 전체적으로 다소 부정적인 견해를 보이는 것으로 나타났다. The purpose of this study was to investigate perceptions of high school students and science teachers about high school fusing science. Science teachers and high school students perceived that high school fusing science was related to various areas and they preferred to be taught separately from each area. Science teachers perceived that high school fusing science improved the understanding in the area of scientific common knowledge, advanced technology, and the history of science, but neither scientific writing nor discussion were actively involved. It also didn`t contribute to the enhancement of scientific thinking and communication skill. Especially, high school students believed that they were more interested in science through fusing science. On the other hand, teachers believed that this high school fusing science might not impact student`s learning and generate negative perception. Science teachers and students perceived that they were more interested in fusing science because it was combination of many areas in science. They also perceived that contents in fusing science were more related to their daily life.

온도 및 절연체에 따른 케이블의 단선시간 특성 해석

김주희 ( Ju-hee Kim ),강신동 ( Sin-dong Kang ),김재호 ( Jae-ho Kim ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.5

This paper describes the fusing time characteristics of Light PVC Sheathed Circular Cord(VCTF) and Tray Frame Retardant(TFR) cables according to increased temperature under over current condition. The experimental equation will be used to determine the validity and reliability of the test results. The over current flowed 3, 5 and 10 times higher than the amount of allowable current using DC power supply with DAQ(Data Acquisition) measurement system. An infrared radiation heater, which was controlled by a variable AC auto transformer, was used to increase the temperature from room temperature to 50, 100 and 150 degrees Celsius. First, two type of cables were analyzed those with different cross-sectional areas with in the same structure and those with different structures with in the same cross-sectional areas. Then, it was determined how fusing time had been influenced according to the cross-sectional areas and different structures, respectively. The cable resistance was increased by joule heating according to increasing temperature. Therefore, the allowable current of cable is decreased. Finally, the fusing time of the cable was decreased due to increased temperatures at current flow, which were 3 times the amount of allowable current. The instantaneous breakdown was observed when current flow was 5 and 10 times over the amount of allowable current. The fusing time is directly affected by the structure of cable insulation.

디레이팅 기법에 의한 마이크로 퓨즈 용단의 특성 분석

김도경(Do-Kyeong Kim),김종식(Jong-Sick Kim) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.6

Recently, Illumination industry of LED module has been focused to industry technology for energy conservation of nation. The LED device is excellent to power efficiency due to semiconductor light source element. And the application to the lighting circuit technology can be designed to the sensitive lighting system for human sensitivity control. In this paper, as a process for analyzing the operating temperature of standardized electronic device including LED device has analyzed about fusing character with in designed micro fuse for electronic device protection from the over current. Using the de-rating technique, which is performed to micro fuse fusing test in the range of -30℃~120℃ thermostatic chamber. To the output data in each temperature zone, it is performed to first-order linear fitting. Additionally, applying the resistance temperature coefficient and statistical data for the reliable analysis has derived to the metal element resistance of micro fuse with temperature change of the thermostatic chamber. As a research result, The changed temperature effect of thermostatic chamber was confirmed regarding fusing time change.

The Characteristics of Arc Scattering and Fusing Current of Copper Wire in the Fault Process DB System of Cables in a PL Environment

Young-Seok Kim,Kil-Mok Shong,Sun-Gu Kim 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.3

The importance of identifying the causes of electrical faults cannot be overstated because of the accidents caused by over-current that take place at the home, the office and electrical facilities due to misuse, poor products and system faults. It is necessary to gather objective, scientific data pertaining to electrical fault investigation in a product liability (PL) environment. To date, no database (DB) has been built concerning the accurate cause analysis of faultyfacilities. In this paper, accident hazard and are scattering when over-current flows in copper wire was investigated. It was found that when over-current flows in a copper wire, the copper wire became heated and bent and beads were scattered around the wire with a flash. It was determinedthat the fusing current and time was related to the current rise per second For example, when the current rise per second was largethe fusing current was higher than when the current rise per second was small, and the beads dispersed along a wide area. Fusing time, however, was shorter. The possibility of electrical fault became highest when the fusing current was higher. As the current rise per second is short, the dendrite structure is distributed in the surface of the copper wire. These experimental results can be utilized for a fault process DB system in the investigation and the prevention of electrical faults.

The Characteristics of Arc Scattering and Fusing Current of Copper Wire in the Fault Process DB System of Cables in a PL Environment

Kim, Young-Seok,Shong, Kil-Mok,Kim, Sun-Gu The Korean Institute of IIIuminating and Electrica 2008 조명·전기설비학회논문지 Vol.22 No.3

The importance of. identifying the causes of electrical faults cannot be overstated because of the accidents caused by over-current that take place at the home, the office and electrical facilities due to misuse, poor products and system faults. It is necessary to gather objective, scientific data pertaining to electrical fault investigation in a product liability(PL) environment. To date, no database(DB) has been built concerning the accurate cause analysis of faultyfacilities. In this paper, accident hazard and arc scattering when over-current flows in copper wire was investigated. It was found that when over-current flows in a copper wire, the copper wire became heated and bent and beads were scattered around the wire with a flash. It was determinedthat the fusing current and time was related to the current rise per second. For example, when the current rise per second was largethe fusing current was higher than when the current rise per second was small, and the beads dispersed along a wide area. Fusing time, however, was shorter. The possibility of electrical fault became highest when the fusing current was higher. As the current rise per second is short, the dendrite structure is distributed in the surface of the copper wire. These experimental results can be utilized for a fault process DB system in the investigation and the prevention of electrical faults.