• 한국산학기술학회논문지
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• 제13권2호
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• pp.485-491
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• 2012

최근 국내 섬유산업의 생산량이 증가함에 따라 섬유산업에서 에너지 소비는 계속 증가되고 있는 실정이다. 기존의 염색기는 고온 고압의 특성을 가지고 있기 때문에 염색 후 냉각을 하기 위하여 열교환기를 통한 간접냉각방식을 채택하고 있다. 이러한 간접냉각방식은 물의 소모량이 많으며 작업 시간 또한 오래 걸리는 문제점이 있고 냉각시 염액의 고착으로 인해 냉각 후 환원세정 및 수세를 수차례 하므로 에너지가 많이 소비된다. 따라서 본 논문에서는 고온 고압 액류 염색기의 열교환기에 의한 간접냉각방식을 염색기내에 냉수를 직접 공급하는 직접냉각방식으로 대체하기 위한 장치를 개발하여 기존의 염색기에 적용하여 냉각과 동시에 환원세정공정을 생략하고 수세공정을 단축시키면서 전공정을 마무리함으로써 전체 작업공정을 줄이고 에너지 소비를 절감하는 등의 생산성을 획기적으로 향상시킬 수 있는 직접냉각수세장치를 제안하며, 시제작품을 제작하고, 실제 염색기에 적용하여 기존의 간접 냉각 방식의 염색기와 성능, 자원 및 에너지 절감율을 비교하였다. 또한 시제작품을 적용한 염색기의 염색성 실험을 하였다.

• 한국의상디자인학회지
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• 제24권2호
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• pp.1-10
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• 2022

The purpose of this study is to analyze the structural properties of 100% wool fabrics knitted with various stitch types and to evaluate dimensional stability from shrinkage in wet cleaning and drying. Materials were weft-knitted from twenty-four different stitches with 7 gauge using a computerized flatbed knitting machine. Weight, thickness, density, and length were measured. A domestic washing machine and a tumble dryer were used for the shrinkage test. The results are as follows: Knitted fabrics were divided into 3 groups based on weight per unit area. Porous knits show light weight whilst milano, pintuck, rib stitches belong to the heaviest group. A positive correlation between weight and thickness was found and the same result was obtained for wale density and weight. Dimensional shrinkage of knitted fabrics was increased during repetitive wet cleaning and drying regardless of knit stitches. Especially, fabrics knitted with float, tuck, cable, and links & links stitches samples were contracted more than 15% in the first treatment whereas 2x1 rib stitch showed 1% shrinkage rate. Fisherman and milano stitches contracted in both course and wale direction with similar shrinkage rates. However, porous knits with float and tuck stitches shrank in course direction by 20% as well as cable samples contracted from 5% to 20% after repeated washing and drying. On the other hand, 30% and 15% contraction of wale direction occurred in orderly float and links & links stitches, respectively. Machine dried knits have a higher shrinkage rate than air-dried knits, but the drying method did not affect to the direction of contraction. In conclusion, variations of knit, tuck, and float stitches affect knit construction and dimensional stability from shrinkage in wet cleaning and drying of wool knitted fabrics.

• Journal of Information Processing Systems
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• 제19권2호
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• pp.149-163
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• 2023

Affected by external factors, errors in time series data collected by sensors are common. Using the traditional method of constraining the speed change rate to clean the errors can get good performance. However, they are only limited to the data of stable changing speed because of fixed constraint rules. Actually, data with uneven changing speed is common in practice. To solve this problem, an online cleaning algorithm for time series data based on dynamic speed change rate constraints is proposed in this paper. Since time series data usually changes periodically, we use the extreme learning machine to learn the law of speed changes from past data and predict the speed ranges that change over time to detect the data. In order to realize online data repair, a dual-window mechanism is proposed to transform the global optimal into the local optimal, and the traditional minimum change principle and median theorem are applied in the selection of the repair strategy. Aiming at the problem that the repair method based on the minimum change principle cannot correct consecutive abnormal points, through quantitative analysis, it is believed that the repair strategy should be the boundary of the repair candidate set. The experimental results obtained on the dataset show that the method proposed in this paper can get a better repair effect.

• 한국의류학회지
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• 제47권2호
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• pp.353-370
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• 2023

In this study, the performance of ultrasonic cleaners for ultrasonic washing, which is one of the wet cleaning methods, was evaluated. The washing performances of ultrasonic cleaners were compared with commercial washing machines under normal and wool courses based on different parameters such as detergency, wrinkle formation, fabric damage, dimensional stability, and germ removal ability. Cotton, silk and wool were used in this experiment. Results revealed that the ultrasonic washing detergency of cotton fabrics was lower than that of commercial washing machines under the normal course and similar to that of commercial washing machines under the wool course. Detergency of silk fabrics was similar under both normal and wool courses. In terms of wrinkle formation and dimensional stability, ultrasonic cleaners showed lesser wrinkles and lower shrinkage than commercial washing machines. Considering damage evaluation, ultrasonic cleaners more effectively removed soil without damaging fabrics compared with commercial washing machines. The bacteria removal rate of both cotton and silk was more effective than the wool course of a commercial washing machine. Thus, this study compares the performance of ultrasonic cleaners and commercial washing machines and provides meaningful results related to ultrasonic washing performance.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.143-144
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• 2006

• The Journal of Advanced Prosthodontics
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• 제4권4호
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• pp.192-196
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• 2012

PURPOSE. The purpose of this study was to evaluate the effect of provisional cement removal by different dentin cleaning protocols (dental explorer, pumice, cleaning bur, Er:YAG laser) on the shear bond strength between ceramic and dentin. MATERIALS AND METHODS. In total, 36 caries-free unrestored human third molars were selected as tooth specimens. Provisional restorations were fabricated and cemented with eugenol-free provisional cement. Then, disc-shaped ceramic specimens were fabricated and randomly assigned to four groups of dentin cleaning protocols (n = 9). Group 1 (control): Provisional cements were mechanically removed with a dental explorer. Group 2: The dentin surfaces were treated with a cleaning brush with pumice Group 3: The dentin surfaces were treated with a cleaning bur. Group 4: The provisional cements were removed by an Er:YAG laser. Self-adhesive luting cement was used to bond ceramic discs to dentin surfaces. Shear bond strength (SBS) was measured using a universal testing machine at a 0.05 mm/min crosshead speed. The data were analyzed using a Kolmogorov Smirnov, One-way ANOVA and Tukey HSD tests to perform multiple comparisons (${\alpha}$=0.05). RESULTS. The dentin cleaning methods did not significantly affect the SBS of ceramic discs to dentin as follows: dental explorer, pumice, cleaning bur, and Er:YAG laser. CONCLUSION. The use of different cleaning protocols did not affect the SBS between dentin and ceramic surfaces.

• 제어로봇시스템학회논문지
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• 제11권12호
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• pp.1011-1019
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• 2005

In this paper, Ubiquitous Home Mess-Cleanup Robot(UHMR), which has a practical function of the automatic mess-cleanup, is developed. The vacuum-cleaner had made the burden of house chore lighten but the operation labour of a vacuum-cleaner had been so severe. Recently, the cleaning robot was producted to perfectly solve the cleaning labour of a house but it also was not successful because it still had a problem of mess-cleaning, which was the clean-up of big trash and the arrangement of newspapers, clothes, etc. The cleaning robot is to just vacuum dust and small trash but has no function to arrange and take away before the automatic vacuum-cleaning. For this reason, the market for the cleaning robot is not yet built up. So, we need a design method and technological algorithm of new automatic machine to solve the problem of mess-cleanup in house. It needs functions of agile automatic navigation, novel manipulation system for mess-cleanup. The automatic navigation system has to be controlled for the full scanning of living room, to recognize the absolute position and orientation of tile self, the precise tracking of the desired path, and to distinguish the mess object to clean-up from obstacle object to just avoid. The manipulate,, which is not needed in the vacuum-cleaning robot, must have the functions, how to distinguish big trash to clean from mess objects to arrange, how to grasp in according to the form of mess objects, how to move to the destination in according to mess objects and arrange them. We use the RFID system to solve the problems in this paper and propose the reading algorithm of RFID tags installed in indoor objects and environments. Then, it should be an intelligent system so that the mess cleaning task can be autonomously performed in a wide variety of situations and environments. It needs to also has the entertainment functions for the good communication between the human and UHMR. Finally, the good performance of the designed UHMR is confirmed through the results of the mess clean-up and arrangement.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1612-1616
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• 2005

In this paper, a Home Mess-Cleanup Robot(HMR), which has a practical function of the automatic mess-cleanup, is developed. The vacuum-cleaner had made the burden of house chore lighten but the operation labour of a vacuum-cleaner had been so severe. Recently, the cleaning robot was producted to perfectly solve the cleaning labour of a house but it also was not successful because it still had a problem of mess-cleaning, which was the clean-up of big trash and the arrangement of newspapers, clothes, etc. The cleaning robot is to just vacuum dust and small trash but has no function to arrange and take away before the automatic vacuum-cleaning. For this reason, the market for the cleaning robot is not yet built up. So, we need a design method and technological algorithm of new automatic machine to solve the problem of mess-cleanup in house. It needs functions of agile automatic navigation, novel manipulation system for mess-cleanup. The automatic navigation system has to be controlled for the full scanning of living room, to recognize the absolute position and orientation of the self, the precise tracking of the desired path, and to distinguish the mess object to clean-up from obstacle object to just avoid. The manipulator, which is not needed in the vacuum-cleaning robot, must have the functions, how to distinguish big trash to clean from mess objects to arrange, how to grasp in according to the form of mess objects, how to move to the destination in according to mess objects and arrange them. We use the RFID system to solve the problems in this paper and propose the reading algorithm of RFID tags installed in indoor objects and environments. Then, it should be an intelligent system so that the mess cleaning task can be autonomously performed in a wide variety of situations and environments. It needs to also has the entertainment functions for the good communication between the human and HMR. Finally, the good performance of the designed HMR is confirmed through the results of the mess clean-up and arrangement.

• 문화기술의 융합
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• 제8권3호
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• pp.507-514
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• 2022

본 연구에서는 출산 경험이 있는 여성을 대상으로 젖병 세척기 사용 시 손목 회전 동작에서 나타나는 근활성도 및 세척 방법에 따른 세척 청결도, 사용성 평가를 비교 분석하고자 한다. 이를 위하여 자동 젖병 세척기와 수동 젖병 세척기 사용 시 전완근의 근활성도, 세척 청결도는 장비를 활용하여 정량 평가하였으며, 변인들의 효과 분석을 실시하여 다음과 같은 결론을 얻었다. 첫째, 근활성도는 자동 젖병 세척기가 수동 젖병 세척기를 사용할 때 보다 낮은 것으로 나타났다. 둘째, 청결도는 자동세척(정방향+역방향)시 세척력이 제일 우수한 것으로 판단되며, 그 다음으로 자동세척(정방향), 수동세척 순으로 나타났다. 셋째, 젖병 세척기 사용에 대한 사용성 평가는 자동 젖병 세척기가 수동 젖병 세척기에 비하여 높은 만족도를 보였다. 이러한 결론을 통해 자동 젖병세척기 사용에 대한 효과성을 입증함으로서 본 연구는 향후 제품 고도화의 기초자료로 활용할 수 있을 것으로 판단된다.

• 한국공작기계학회논문집
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• 제15권4호
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• pp.69-73
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• 2006

This paper present the optimal cleaning condition of the out-hull preprocessing robot by Taguchi method in design of experiments. A $L_8(2^4)$ orthogonal array is adopted to study the effect of adjustment parameters. The adjustment parameters consist of robot speed, motor torque, motor speed and tool angle. And the quality feature is selected as surface roughness of sheet metal. Taguchi analysis is performed in order to evaluate the effect of adjustment parameters of the quality feature of cleaning process by $Minitab^{(R)}$.