Journal of the Korean Society for Precision Engineering最新文献_第10页

A Study on Creep Phenomenon after the Releasing of Injection Molded Articles 注塑制品脱模后蠕变现象的研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-08-31 DOI: 10.7736/jkspe.023.011

Yu-Jung Kim, H. Bang

{"title":"A Study on Creep Phenomenon after the Releasing of Injection Molded Articles","authors":"Yu-Jung Kim, H. Bang","doi":"10.7736/jkspe.023.011","DOIUrl":"https://doi.org/10.7736/jkspe.023.011","url":null,"abstract":"Recently, with the expansion of application of polymer composite materials, high levels of deformation compensation actions have been developed. However, there is a problem of high-temperature viscoelasticity that occurs over time after completing the injection molding process. In this study, changes of mechanical properties of the Moldflow program for injection molding were analyzed to verify the viscoelasticity phenomenon through deformation analysis. In addition, deformation analysis of plastic injection molded products according to arrangement of three ribs was conducted and two products with different geometric shapes of the same function were compared. As a result, it was possible to reflect the viscoelastic effect by reducing the elastic modulus and shear modulus of the material. It was confirmed that the geometric shape with thick ribs formed in multiple longitudinal directions was mainly responsible. On the surface of the product where the rib arrangement was parallel and perpendicular to the flow direction, the orientation was orthogonal to the linear direction and the maximum residual stress was 81.17 MPa, which showed the largest value. It was judged that viscoelastic phenomena could be predicted and that an arrangement of parallel and perpendicular ribs that might intersect should be avoided.","PeriodicalId":37663,"journal":{"name":"Journal of the Korean Society for Precision Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45536149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design, Fabrication, and Control of a Rotary Manipulator driven by Twisted Shape Memory Alloy (SMA) Wires 由扭曲形状记忆合金(SMA)导线驱动的旋转机械手的设计、制造和控制

Journal of the Korean Society for Precision Engineering Pub Date : 2023-08-31 DOI: 10.7736/jkspe.023.039

Gil‐Yong Lee, Suyeon Lee

引用次数: 0

Superhydrophilic Modification of a Polypropylene Depth Filter for Efficient Oil–water Separation 高效油水分离聚丙烯深度过滤器的超亲水改性

Journal of the Korean Society for Precision Engineering Pub Date : 2023-08-31 DOI: 10.7736/jkspe.023.032

H. Park, Jeong-Won Lee, Seongmin Kim, Kihwan Kim, Y. Kim, W. Hwang

{"title":"Superhydrophilic Modification of a Polypropylene Depth Filter for Efficient Oil–water Separation","authors":"H. Park, Jeong-Won Lee, Seongmin Kim, Kihwan Kim, Y. Kim, W. Hwang","doi":"10.7736/jkspe.023.032","DOIUrl":"https://doi.org/10.7736/jkspe.023.032","url":null,"abstract":"), Depth filter ( 심층 필터 ), Plasma treatment ( 플라즈마 처리 ), Dip coating ( 딥 코팅 ), Oil–water separation ( 유수분리 ) Purification of water through oil–water separation is essential for preserving the ecosystem and protecting human health. Although a conventional polypropylene depth filter can effectively purify water, modifying the wettability of a filter for oil–water separation is difficult owing to its low reactivity. In this study, we developed a superhydrophilic polypropylene filter with a hydrogel layer that could enable effective oil–water separation by using plasma treatment and dip coating, which enabled an even distribution of the coating solution across the filter. The fabricated filter was superhydrophilic with a water contact angle of 0 o . It showed a high repulsive force with oil in water with an underwater oil contact angle of 142.9 o . When such filter was applied to an oil–water separation device, it effectively purified water with low oil content (< 15 ppm) at a flow rate of 300 mL/ min. These results demonstrate potential applications of such filters in areas such as wastewater treatment and oil spill cleanup.","PeriodicalId":37663,"journal":{"name":"Journal of the Korean Society for Precision Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47163761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heat Reduction Characteristics of Wear Ring with Umbrella-type Micro-dimple 伞形微凹坑耐磨环的减热特性

Journal of the Korean Society for Precision Engineering Pub Date : 2023-08-31 DOI: 10.7736/jkspe.023.040

Young-Chan Yoon, Taek-Sung Lee

引用次数: 0

Study on Effect of Ultrasonic Nanocrystal Surface Modification in Bolt Manufactured by Screw Rolling 超声纳米晶表面改性对螺杆轧制螺栓的影响研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-08-31 DOI: 10.7736/jkspe.023.023

Hyeong-Jin Ha, Hana Park, Tae-Hyung Jung, D. Shim

引用次数: 0

Wearable Inertial Sensors-based Joint Kinetics Estimation of Lower Extremity Using a Recurrent Neural Network 基于可穿戴惯性传感器的基于递归神经网络的下肢联合动力学估计

Journal of the Korean Society for Precision Engineering Pub Date : 2023-08-31 DOI: 10.7736/jkspe.023.042

J. Choi, Chan Lee, Jung-Keun Lee

引用次数: 0

Prediction of the Remaining Useful Life of L-holder for Continuous Ship Unloader 连续卸船机L型支架剩余使用寿命的预测

Journal of the Korean Society for Precision Engineering Pub Date : 2023-08-31 DOI: 10.7736/jkspe.023.015

Seung-Hun Lee, Dong‐Woo Lee, Jung‐il Song

引用次数: 0

Correlation Analysis between Clinical Rating Scales and Inertial Signal Features in Parkinson’s Disease Patients 帕金森病患者临床评定量表与惯性信号特征的相关性分析

Journal of the Korean Society for Precision Engineering Pub Date : 2023-07-31 DOI: 10.7736/jkspe.022.149

Tae-Hee Kim, Ha-Eun Jo, Hui-Woo Choi, Pyoung-Hwa Choi, Won-jae Lee, Heegoo Yang, W. S. Sim

引用次数: 0

A Study on the Multi-focus Method of Microscopic Images for Oil-painting Analysis 油画显微图像多聚焦分析方法的研究

Journal of the Korean Society for Precision Engineering Pub Date : 2023-07-31 DOI: 10.7736/jkspe.022.151

H. Kim, Duk-Yeon Lee, D. Choi, Jaehyeon Kang, Dong-Wook Lee

{"title":"A Study on the Multi-focus Method of Microscopic Images for Oil-painting Analysis","authors":"H. Kim, Duk-Yeon Lee, D. Choi, Jaehyeon Kang, Dong-Wook Lee","doi":"10.7736/jkspe.022.151","DOIUrl":"https://doi.org/10.7736/jkspe.022.151","url":null,"abstract":"surface it is inconvenient to analyze an entire image due to multiple defocused areas. The defocusing is usually caused by the small depth of the lens and the rough surface curve. Thus, these microscopic images in an oil painting have multiple focal points, which indicates multi-focus images. We present a multi-focus fusion synthesizing a focused image from scans based on focal direction and selection of focused places. Based on microscopic characteristics, a common scanned area of the images was defined to unify the lens multiplication. A focus index was applied to each pixel to identify well-focused pixels and generate a mapping image in the focal direction. Subsequently, a median filter was applied to the mapping image and a multifocal image was acquired based on actual pixel values obtained from the mapping image. The proposed method was utilized in analyzing oil painting samples carrying rough surface curves. The multifocal image facilitated the analysis of the oil painting surface and resulted in enhanced quality compared with other methods. The proposed method can be used to generate useful images in scientific and industrial microscopy","PeriodicalId":37663,"journal":{"name":"Journal of the Korean Society for Precision Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45142685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the Possibility of Classifying Field Hockey Positions Using Random-forest 利用随机森林对曲棍球场地位置进行分类的可能性分析

Journal of the Korean Society for Precision Engineering Pub Date : 2023-07-31 DOI: 10.7736/jkspe.023.055

Ji-Eung Kim, Seung-Hun Lee, Hoi-deok Jeong

引用次数: 0