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Acetylacetone-TiO_(2) Promoted Large Area Compatible Cascade Electron Transport Bilayer for Efficient Perovskite Solar Cells

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Energy & Environmental Materials 2024年第2期7卷 221-228页

作者： Hyong Joon lee Jin Kyoung Park Jin Hyuck Heo Sang Hyuk Im Department of Chemical and Biological Engineering Korea University145 Anam-ro Seongbuk-guSeoul 17104Korea

In designing efficient perovskite solar cells(PSCs),the selection of suitable electron transport layers(ETLs)is critical to the final device performance as they determine the driving force for selective charge ***_(2)nanoparticles(NPs)based ETLs have been a popular choice for PSCs due to superior electron mobility,but their relatively deep-lying conduction band energy levels(ECB)result in substantial potential ***,TiO_(2)NPs establish favorable band alignment owing to shallower ECB,but their low intrinsic mobility and abundant surface trap sites impede the final *** this reason,constructing a cascaded bilayer ETL is highly desirable for efficient PSCs,as it can rearrange energy levels and exploit on advantages of an individual *** this study,we prepare SnO_(2)NPs and acetylacetone-modified TiO_(2)(Acac-TiO_(2))NPs and implement them as bilayer SnO_(2)/Acac-TiO_(2)(BST)ETL,to assemble cascaded energy band ***_(2)contributes to rapid charge carrier transport from high electron mobility while Acac-TiO_(2)minimizes band-offset and effectively suppresses interfacial ***,the optimized BST ETL generates synergistic influence and delivers power conversion efficiency(PCE)as high as 23.14%with open-circuit voltage(V_(oc))reaching 1.14 ***,the BST ETL is transferred to a large scale and the corresponding mini module demonstrates peak performance of 18.39%PCE from 25 cm^(2)aperture ***,the BST-based mini module exhibit excellent stability,maintaining 83.1%of its initial efficiency after 1000 h under simultaneous 1 sun light-soaking and damp heat(85℃/RH 85%)environment.

关键词： acetylacetone large area perovskite solar cells TiO_(2)

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Energy efficient mechanism using flexible medium access control protocol for hybrid wireless sensor networks

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Journal of Central South University 2013年第8期20卷 2165-2174页

作者： sun Ning JEONG yoon-su lee Sang-ho Department of Computer Science Chungbuk National University Department of Information Communication Engineering Mokwon University

Energy efficiency is a primary consideration in a wireless sensor network (WSN). This is also a major parameter when designing a medium access control (MAC) protocol for WSNs. Hierarchical clustering structure is regarded suitable for WSNs due to its good performance in energy conservation. In this work, an adequately flexible mechanism for clustering WSNs is designed, in which some creative or promotional metrics are utilized, such as cluster head selection algorithm, cluster optional reconstruction, interested data transmission, multiple path routing protocol. All these strategies were cooperated to maximize energy saving of whole system. An appropriate MAC protocol for this mechanism is proposed, by flexibly switching the status of diverse sensor nodes in different strategies. The simulation results show that the proposed MAC protocol is suitable for clustering WSNs and performs well in aspects of energy efficiency, flexibility and scalability.

关键词： MAC protocol energy conservation flexibility re-clustering wireless sensor network

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The HIF-1α/PLOD2 axis integrates extracellular matrix organization and cell metabolism leading to aberrant musculoskeletal repair

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Bone Research 2024年第2期12卷 289-301页

作者： Heeseog Kang Amy L.Strong Yuxiao sun Lei Guo Conan Juan Alec C.Bancroft Ji Hae Choi Chase A.Pagani Aysel A.Fernandes Michael Woodard Juhoon lee Sowmya Ramesh Aaron W.James David Hudson Kevin N.Dalby Lin Xu Robert J.Tower Benjamin Levi Center for Organogenesis Regeneration and TraumaDepartment of SurgeryUniversity of Texas SouthwesternDallasTX 75390USA Section of Plastic Surgery Department of SurgeryUniversity of MichiganAnn ArborMI 48109USA Quantitative Biomedical Research Center Peter O’Donnell Jr.School of Public HealthUniversity of Texas SouthwesternDallasTX 75390USA Department of Orthopedics and Sports Medicine University of WashingtonSeattleWA 98195USA Division of Chemical Biology and Medicinal Chemistry College of PharmacyUniversity of Texas at AustinAustinTX 78712USA Department of Pathology Johns Hopkins UniversityBaltimoreMD 21218USA

While hypoxic signaling has been shown to play a role in many cellular processes,its role in metabolism-linked extracellular matrix(ECM)organization and downstream processes of cell fate after musculoskeletal injury remains to be ***(HO)is a debilitating condition where abnormal bone formation occurs within extra-skeletal *** andhypoxia-inducible factor 1α(HIF-1α)activation have been shown to promote ***,the underlying molecular mechanisms bywhich the HIF-1αpathway in mesenchymal progenitor cells(MPCs)contributes to pathologic bone formation remain to ***,we used a proven mouse injury-induced HO model to investigate the role of HIF-1αon aberrant cell ***-cell RNA sequencing(scRNA-seq)and spatial transcriptomics analyses of the HO site,we found that collagen ECM organizationis the most highly up-regulated biological process in *** mesenchymal cell-specific deletion of Hif1α(Hoxa11-CreER^(T2);Hif1a^(fl/fl))significantly mitigated HO in ***-seq analysis of these Hoxa11-CreER^(T2);Hif1a^(fl/fl)mice identified the PLOD2/LOXpathway for collagen cross-linking as downstream of the HIF-1αregulation of ***,our scRNA-seq data and mechanisticstudies further uncovered that glucose metabolism in MPCs is most highly impacted by HIF-1α*** a translational aspect,a pan-LOX inhibitor significantly decreased HO.A newly screened compound revealed that the inhibition of PLOD2 activity in MPCssignificantly decreased osteogenic differentiation and glycolytic *** suggests that the HIF-1α/PLOD2/LOX axis linked tometabolism regulates HO-forming MPC *** results suggest that the HIF-1α/PLOD2/LOX pathway represents a promisingstrategy to mitigate HO formation.

关键词： metabolism skeletal aberrant

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Journal of Central South University 2014年第9期21卷 3534-3540页

作者： lee Sang-hyuk YAN sun JEONG yoon-su SHIN Seung-soo Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University International Business School Suzhou Xi'an Jiaotong-Liverpool University Department of Information Communication Engineering Mokwon University Department of Information Security Tongmyong University

Information analysis of high dimensional data was carried out through similarity measure application. High dimensional data were considered as the a typical structure. Additionally, overlapped and non-overlapped data were introduced, and similarity measure analysis was also illustrated and compared with conventional similarity measure. As a result, overlapped data comparison was possible to present similarity with conventional similarity measure. Non-overlapped data similarity analysis provided the clue to solve the similarity of high dimensional data. Considering high dimensional data analysis was designed with consideration of neighborhoods information. Conservative and strict solutions were proposed. Proposed similarity measure was applied to express financial fraud among multi dimensional datasets. In illustrative example, financial fraud similarity with respect to age, gender, qualification and job was presented. And with the proposed similarity measure, high dimensional personal data were calculated to evaluate how similar to the financial fraud. Calculation results show that the actual fraud has rather high similarity measure compared to the average, from minimal 0.0609 to maximal 0.1667.

关键词： high dimensional data similarity measure difference neighborhood information financial fraud

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Comparative analyses of the venom components in the salivary gland transcriptomes and saliva proteomes of some heteropteran insects

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Insect Science 2022年第2期29卷 411-429页

作者： Kyungjae Andrew yoon Woo-Jin Kim Seungki lee Hee-sun Yang Byoung-Hee lee Si Hyeock lee Research Institute of Agriculture and Life Sciences Seoul National UniversitySeoulKorea EntoCode Co. SeoulKorea National Institute of Biological Resources Environmental Research ComplexIncheonKorea Department of Agricultural Biology Seoul National UniversitySeoulKorea

Salivary gland-specific transcriptomes of nine heteropteran insects with distinct feeding strategies (predaceous, hematophagous, and phytophagous) were analyzed and annotated to compare and identify the venom components as well as their expression profiles. The transcriptional abundance of venom genes was verified via quantitative real-time PCR. Hierarchical clustering of 30 representative differentially expressed venom genes from the nine heteropteran species revealed unique groups of salivary gland-specific genes depending on their feeding strategy. The commonly transcribed genes included a paralytic neurotoxin (arginine kinase), digestive enzymes (cathepsin and serine protease), an anti-inflammatory protein (cystatin), hexamerin, and an odorant binding protein. Both predaceous and hematophagous (bed bug) heteropteran species showed relatively higher transcription levels of genes encoding proteins involved in proteolysis and cytolysis, whereas phytophagous heteropterans exhibited little or no expression of these genes, but had a high expression of vitellogenin, a multifunctional allergen. Saliva proteomes from four representative species were also analyzed. All venom proteins identified via saliva proteome analysis were annotated using salivary gland transcriptome data. The proteomic expression profiles of venom proteins were in good agreement with the salivary gland-specific transcriptomic profiles. Our results indicate that profiling of the salivary gland transcriptome provides important information on the composition and evolutionary features of venoms depending on their feeding strategy.

关键词： hematophagous heteroptera phytophagous predaceous proteome analysis salivary gland-specific venom transcriptome analysis

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Magnetic field stabilization system designed for the cold-atom coherent population-trapping clock

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CHINESE OPTICS LETTERS 2024年第8期22卷 080202-080202页

作者： Zhan, Chang Ma, Zhu Wu, Jiatao Li, Maojie Han, Chengyin Lu, Bo lee, Chaohong sun Yat Sen Univ Zhuhai Campus Sch Phys & Astron Lab Quantum Engn & Quantum Metrol Zhuhai 519082 Peoples R China Shenzhen Univ Inst Quantum Precis Measurement State Key Lab Radio Frequency Heterogeneous Integr Shenzhen 518060 Peoples R China Shenzhen Univ Coll Phys & Optoelect Engn Shenzhen 518060 Peoples R China Quantum Sci Ctr Guangdong Hong Kong Macao Greater Hong Kong 518045 Peoples R China

Accurate control of magnetic fields is crucial for cold-atom experiments, often necessitating custom-designed control systems due to limitations in commercially available power supplies. Here, we demonstrate precise and flexible control of a static magnetic field by employing a field-programmable gate array and a feedback loop. This setup enables us to maintain exceptionally stable current with a fractional stability of 1 ppm within 30 s. The error signal of the feedback loop exhibited a noise level of 10(-5) A. Hz(-1/2) for control bandwidths below 10 kHz. Utilizing this precise magnetic field control system, we investigate the second-order Zeeman shift in the context of cold-atom coherent population-trapping (CPT) clocks. Our analysis reveals the second-order Zeeman coefficient to be 574.21 Hz/G(2), with an uncertainty of 1.36 Hz/G(2). Consequently, the magnetic field stabilization system we developed allows us to achieve a second-order Zeeman shift below 10(-14), surpassing the long-term stability of current cold-atom CPT clocks.

关键词： cold-atom coherent popualtion-trapping clock Zeeman coefficient magnetic field stabilization system

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Geometric-phase intraocular lenses with multifocality

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Light(Science & Applications) 2022年第11期11卷 2805-2816页

作者： Seungmin lee Gayeon Park Senho Kim Yeonghwa Ryu Jae Woong yoon Ho Sk Hwang In Seok Song Chang sun lee Seok Ho Song Department of Physics Hanyang UniversitySeoul 04763Republic of Korea Department of Ophthalmology Catholic University of KoreaSeoul 07345Republic of Korea Seoul Ophthalmic Clinic Goyang 10463Republic of Korea Koryoeyetech In.Seoul 06093Republic of Korea Tigernics IncSeoul 04763Republic of Korea

We demonstrate a new type of multifocal and extended depth of focus(EDOF)intraocular lenses(IOLs)embeddingμm-thin geometric phase(GP)lens *** an emerging approach for lens phase design,the GP modulated IOLs outperform conventional diffractive IOLs in multifocality while completely avoiding the clinically undesirable demand for additional surface patterns to standard monofocal IOL *** number of foci and light splitting ratio of the GP IOLs are adjusted by changing the number of stacked GP layers and the thickness of each *** and trifocal GP IOLs are fabricated by radial alignment of anisotropic orientation in UV-curable liquid crystal *** characterizing the defocus image and modulation transfer function of the GP IOLs,it is expected that GP IOLs will alleviate the most common problems associated with multifocal and EDOF IOLs,blurred vision and photic phenomena caused by light scattering and posterior capsule opacification.

关键词： layer phase alignment

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Helicobacter pylori infection is not associated with nonalcoholic fatty liver disease

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World Journal of Gastroenterology 2016年第8期22卷 2592-2600页

作者： Myong Ki Baeg Seung Kew yoon sun-Hye Ko Yong-sun Noh In-Seok lee Myung-Gyu Choi Department of Internal Medicine The Catholic University of Korea College of Medicine

AIM: To determine whether Helicobacter pylori (H. pylori) infection confers a higher risk of Nonalcoholic fatty liver disease (NAFLD).METHODS: Healthy people who underwent health screening were analyzed retrospectively. Inclusion criteria were age ≥ 20 years, history of H. pylori infection, and recorded insulin level. Participants were classified as H. pylori positive or negative according to 13C urea breath tests. NAFLD was defined using the hepatic steatosis index (HSI) and NAFLD liver fat score (NAFLD-LFS). Those with an HSI > 36 or NAFLD-LFS > -0.640 were considered to have NAFLD. Multivariable logistic regression was performed to identify risk factors for ***: Three thousand six hundred and sixty-three people were analyzed and 1636 (44.7%) were H. pylori positive. H. pylori infection was associated with older age, male gender, hypertension, higher body mass index, and a dyslipidemic profile. HSI differed significantly between H. pylori positive and negative subjects (median 33.2, interquartile range (IQR) 30.0-36.2 for H. pylori-positive vs median 32.6, IQR 29.8-36.0 for negative participants, P = 0.005), but NAFLD-LSF did not [median -1.7, IQR -2.4 - -0.7 vs median -1.8, IQR -2.4-(-0.7), respectively, P = 0.122]. The percentage of people with NAFLD did not differ between infected and uninfected groups: HIS, 26.9% vs 27.1%, P = 0.173; NAFLD-LFS, 23.5% vs 23.1%, P = 0.778. H. pylori infection was not a risk factor, but C-reactive protein concentration and smoking were significant risk factors for ***: H. pylori infection is not a risk factor for NAFLD as indicated by HSI or NAFLD-LFS. Prospective, large-scale studies involving liver biopsies should be considered.

关键词： Helicobacter pylori Nonalcoholic fatty liver disease Hepatic steatosis index Nonalcoholic fatty liver disease liver fat score Urea breath test

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Characterization of Wollastonite Glass-ceramics Made from Waste Glass and Coal Fly Ash

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Journal of Materials Science & Technology 2013年第2期29卷 149-153页

作者： Soon-Do yoon Jong-Un lee Jeong-Hwan lee Yeon-Hum Yun Wang-Jung yoon School of Biotechnology and Chemical Engineering Chonnam National University Department of Energy & Resources Engineering Chonnam National University

The crystallization behavior of wollastonite glass-ceramics was investigated by means of X-ray diffraction （XRD） analysis and surface morphological observations, and the chemical compositions were evaluated by field emission-scanning electron microscopy （FE-SEM） and energy dispersive X-ray spectroscopy （EDS）. Various heat treatment temperatures （850, 900, 950, 1000 and 1050 ℃） were used to obtain glass-ceramics of the ideal wollastonite crystal phase as well as optimum mechanical properties and chemical durability. From XRD, FE-SEM and EDS, the crystallization of acicular crystal phase in the matrix was achieved at heat treatment temperature of 1000 and 1050 ℃, and wollastonite （CaSiO3） was found in the acicular type main crystal phase in the glass-ceramics. Various properties, such as density, compressive strength, bending strength and chemical durability were also examined. The mechanical properties of glass-ceramics obtained at the heat treatment temperature of 1000 and 1050 ℃ were superior to those obtained at the heat treatment temperature of 850 ℃.

关键词： Coal fly ash Waste glass Mechanical properties Glass-ceramics

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Keystone design perforator island flap in facial defect reconstruction

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World Journal of Clinical Cases 2020年第10期8卷 1832-1847页

作者： Soo Yeon Lim Chi sun yoon Hyun Gun lee Kyu Nam Kim Department of Plastic and Reconstructive Surgery Konyang University HospitalUniversity of Konyang College of MedicineMyunggok Medical Research CenterDaejeon 35365South Korea Department of Plastic and Reconstructive Surgery Wonkwang University HospitalWonkwang University School of MedicineIksan 54538South Korea

Facial defect coverage is a common subject in the field of reconstructive *** are many methods for facial defect reconstruction,and reconstructive surgeons should choose the most appropriate method on a case-by-case basis to achieve both functional and aesthetic *** various options for facial reconstruction,the local flap technique is considered the best reconstructive modality to provide good tissue matches of color and texture,which is consistent with the ideal goal of reconstruction(replacement of like-with-like).Keystone design perforator island flap(KDPIF),devised by Behan in 2003,has been applied to various fields of reconstructive surgery in the past decade due to its design simplicity,robust vascular supply,and *** studies have reported KDPIF reconstruction of facial defects,such as large parotid defects,small-to-moderate nasal defects,and eyelid ***,KDPIF has been used relatively less in facial defects than in other body regions,such as the trunk and *** purpose of this review is to provide an organized overview of facial KDPIF reconstruction including the classification of KDPIF,modifications,physiology,mechanism of flap movement,consideration of facial relaxed skin tension lines and aesthetics,surgical techniques,clinical applications,and precautions for successful execution of KDPIF reconstruction.

关键词： Keystone design perforator island flap Reconstructive surgery Facial defects Aesthetics Plastic surgery Flap surgery

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