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Effect of P2O5 on the structure and phase separation of sodium borosilicate glasses
Hwang MinSeong,Chung Jaeyeop 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.2
The effect of P2O5 as an additives that promote the phase separation and distribution of phosphorus in sodium borosilicate glass was investigated. We prepared various NBS1 glasses: (100-x)(0.17Na2O–0.29B2O3–0.54SiO2)–xP2O5 (x = 0, 3, 5, 7, and 10 wt%) and an NBS2P7 glass: 93(0.22Na2O–0.24B2O3–0.54SiO2)–7P2O5 (wt%). Phase separation was confirmed by scanning electron microscope (SEM) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). To understand the phase separation phenomenon, 31P, 11B and 29Si magic angle spinning nuclear magnetic resonance (MAS-NMR) analyses were performed. It was confirmed that phase separation was induced when the P2O5 content was great than 5 wt% in NBS1 glasses, together with a change in the mechanism of phase separation from droplet-type to spinodal-type with increasing P2O5 concentration. The phosphorus incorporated into the borate-rich phase and formed borophosphate units after phase separation. Additionally, the fraction of [BO4] units decreased with increasing P2O5 concentration. This phenomenon is expected to strongly influence the phase separation of sodium borosilicate glasses. In the NBS2P7 glass, no phase separation was observed owing to the high contents of P2O74− and PO43− units. These units were released from the borosilicate matrices to form Na4P2O7 crystalline phases.
Systematic Reliability Study of Top-Gate p- and n-Channel Organic Field-Effect Transistors
Hwang, Do Kyung,Fuentes-Hernandez, Canek,Fenoll, Mathieu,Yun, Minseong,Park, Jihoon,Shim, Jae Won,Knauer, Keith A.,Dindar, Amir,Kim, Hyungchul,Kim, Yongjin,Kim, Jungbae,Cheun, Hyeunseok,Payne, Marcia American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.5
<P>We report on a systematic investigation on the performance and stability of p-channel and n-channel top-gate OFETs, with a CYTOP/Al<SUB>2</SUB>O<SUB>3</SUB> bilayer gate dielectric, exposed to controlled dry oxygen and humid atmospheres. Despite the severe conditions of environmental exposure, p-channel and n-channel top-gate OFETs show only minor changes of their performance parameters without undergoing irreversible damage. When correlated with the conditions of environmental exposure, these changes provide new insight into the possible physical mechanisms in the presence of oxygen and water. Photoexcited charge collection spectroscopy experiments provided further evidence of oxygen and water effects on OFETs. Top-gate OFETs also display outstanding durability, even when exposed to oxygen plasma and subsequent immersion in water or operated under aqueous media. These remarkable properties arise as a consequence of the use of relatively air stable organic semiconductors and proper engineering of the OFET structure.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-5/am405424k/production/images/medium/am-2013-05424k_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am405424k'>ACS Electronic Supporting Info</A></P>
김예슬(YeSeul Kim),김민성(Minseong Kim),전호준(Hojun Jeon),김용복(YongBok Kim),이형진(Hyeongjin Lee),황헌(Heon Hwang),조재열(JaeYoul Cho),김근형(GeunHyung Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The inherent properties of nanosized silica (sil), such as high biocompatibility, chemical and colloidal stability, and easy surface modification, have provided silica materials with a tremendous potential in biomedical applications. In this study, the biocomposites consisting of poly (ε-caprolactone) (PCL) and Sil fabricated by a melt-plotting/coating process can be applied as a potential scaffold for bone tissue regeneration. The pore size and strut diameter of the multi-layered biocomposites were fixed at approximately 300㎛ and 300㎛, respectively, and the morphology, hydrophilic properties, water-absorption, and mechanical strength of various compositions (1.8, 4.8, 9.4wt% of sil) in the composites were evaluated. Through the water-contact angle and water-absorption, the bio-composites displayed dramatically increased hydrophilic properties, and highly roughened surface compared to the pure PCL scaffold. The in vitro biocompatibilities (cell proliferation and mineralization) of the bio-composites wereexamined using pre-osteoblasts (MC3T3E1). Based on scanning electron microscope images, the cells were more easily adhered and grown on the surface of the bio-composites, showing enhanced mineral deposition compared to the pure PCL scaffold after 14 days of cell culture. These results were because the coated sil component in the bio-composites could induce the osteogensis of the composites. Based on the physical and biological activities, we believe that the biocomposite will be a potential biomaterial for enhancing bone tissue regeneration.
시각장애인을 위한 IoT 접목의 음성인식을 이용한 딥 러닝 웨어러블 디바이스
이정옥(Jeongok Lee),김경수(KyoungSoo Kim),민병인(Byungin Min),김동섭(Dongseob Kim),박민성(Minseong Park),황규하(Gyuha Hwang),김용태(YongTae Kim),남지승(Jiseung Nam) 한국정보기술학회 2023 한국정보기술학회논문지 Vol.21 No.4
This paper deals with the study of speech recognition and deep learning algorithm apply to IoT wearable devices for people with visual impairment. This technology aims to improve difficulties visually impaired faces in everyday life. The device proposed in this paper has various functions faces recognition, object detection, optical character recognition, barcode recognition, bill classification and IoT wallpad menu recognition. We connect smart phone application and IoT wearable device to implement these functions. Voice commands are analyzed by Googles voice recognition API and anlalyze input images through deep learning algorithm. As a result, We got more than 90% recognition rate from every functions. It is expected that these technologies can provide convenience and actively used in everyday life for visually impaired.