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Won-Shik Chu,Malik Muhammad Shehroze,Ngoc Giang Tran,The-Hung Dinh,Sung-Tae Hong,Doo-Man Chun 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.5
This review study provides an overview of superhydrophobic surface fabrication techniques based on laser surface texturing that are environmentally friendly. There are many prospective applications for superhydrophobic surfaces, including self-cleaning, anti-icing, oil–water separation, anti-corrosion, and anti-biofouling. Except for hydrophobic nanoparticle coating procedures, superhydrophobic surface manufacturing methods have not been sufficiently developed or commercialized. Among the various fabrication techniques, laser surface texturing is an important process that is different from superhydrophobic surface coating processes. This technique can be used to fabricate superhydrophobic surfaces in an eco-friendly manner and can process selected regions without the use of a mask. This review study is intended to improve our understanding of these laser surface texturing technologies for fabricating superhydrophobic surfaces and to open up new research areas. In this review, procedures, materials, and parameters for creating superhydrophobic surfaces using laser processing and environmentally friendly post-processing are analyzed and summarized. Because they involve the use of hazardous chemicals, common laser processes with fluorination or silanization coatings were not included. Finally, we provide an overview of the study trends and offer conclusions based on this review.
Algorithm for Reducing the Effect of Network Delay of Sensor Data in Network-Based AC Motor Drives
Tae-Won Chun,Jung-Ryol Ahn,Hong-Hee Lee,Heung-Geun Kim,Eui-Cheol Nho 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3
Network-based controls for ac motor drive systems are becoming increasingly important. In this paper, an ac motor control system is implemented by a motor control module and three sensor modules such as a voltage sensor module, a current sensor module, and an encoder module. There will inevitably be network time delays from the sensor modules to the motor control system, which often degrades and even destabilizes the motor drive system. As a result, it becomes very difficult to estimate the network delayed ac sensor data. An algorithm to reduce the effects of network time delays on sensor data is proposed, using both a synchronization signal and a simple method for estimating the sensor data. The algorithm is applied to a vector controlled induction motor drive system, and the performance of the proposed algorithm is verified with experiments.
Cancer stem cell surface markers on normal stem cells
( Won-tae Kim ),( Chun Jeih Ryu ) 생화학분자생물학회(구 한국생화학분자생물학회) 2017 BMB Reports Vol.50 No.6
The cancer stem cell (CSC) hypothesis has captured the attention of many scientists. It is believed that elimination of CSCs could possibly eradicate the whole cancer. CSC surface markers provide molecular targeted therapies for various cancers, using therapeutic antibodies specific for the CSC surface markers. Various CSC surface markers have been identified and published. Interestingly, most of the markers used to identify CSCs are derived from surface markers present on human embryonic stem cells (hESCs) or adult stem cells. In this review, we classify the currently known 40 CSC surface markers into 3 different categories, in terms of their expression in hESCs, adult stem cells, and normal tissue cells. Approximately 73% of current CSC surface markers appear to be present on embryonic or adult stem cells, and they are rarely expressed on normal tissue cells. The remaining CSC surface markers are considerably expressed even in normal tissue cells, and some of them have been extensively validated as CSC surface markers by various research groups. We discuss the significance of the categorized CSC surface markers, and provide insight into why surface markers on hESCs are an attractive source to find novel surface markers on CSCs. [BMB Reports 2017; 50(6): 285-298]
( Won Ho Choi ),( Jae Hwan Shin ),( Tae Hoon Song ),( Won Jun Lee ),( Chun Gon Kim ) 한국복합재료학회 2014 Composites research Vol.27 No.6
In this study, a novel microwave absorber which consists of a structural part, a resistive sheet, and a lowdielectric layer is proposed. Unlike the conventional Salisbury screen, a newly proposed absorber is capable of a rangeof absorbing performance, from narrowband to broadband. In the case of the narrowband absorber, the fabricatedabsorber with optimized design parameters has a strong resonance at 9.25 GHz and reflection loss of .44 dB withsatisfying the .10 dB absorption in whole X-band (8.2 GHz~12.4 GHz). For the broadband absorber design, thereflectivity was minimized in the considered frequency ranges. The designed absorber showed two weak resonancesnear 6.5 GHz and 16.5 GHz and satisfied the .10 dB absorption from C-band to Ku-band (4 GHz~18 GHz). Themeasured reflection loss of fabricated absorber was well matched with simulation results, though the measurement wasonly performed on X-band. For the Salisbury screen to be capable of broadband absorption, it should be stackedmultiply in a structure known as the Jaumann absorber. However, for the microwave absorber presented here,broadband as well as narrowband capabilities can be implemented without a change of the structure.