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RIV Framework for Phase Transition Analysis in Compressed Sensing
Oliver James,Heung-No Lee 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
In this paper, we introduce restricted isometry random variable (RIV) generalizing the restricted isometry constant (RIC) in compressed sensing (CS). For i.i.d. Gaussian encoders, we derive the probability distribution function of the RIV using order statistics and extreme value theory. We show the benefits of the distributions in signal recovery analysis via the critical functions, which predict the RICs of an encoder for various problem sizes. We demonstrate that RIV-based critical functions give precise estimates of the RICs than the previous eigenvalue (EV) -based approaches. We also demonstrate that this precise estimation aids to improve the previous EV-based phase transition analysis in CS.
Oliver Berberich,Julia Blöhbaum,Stefanie Hölscher-Doht,Rainer H. Meffert,Jörg Teßmar,Torsten Blunk,Jürgen Groll 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Tissue adhesives play an important role in clinical applications and may aid in the treatment of cartilagedefects for improved cartilage integration. However, many fail to satisfy the demand for adequateadhesive strength on wet tissue surfaces and to facilitate sufficient cell migration and extracellular matrix(ECM) deposition at the defect site. Utilizing poly(2-alkyl-2-oxazoline) (POx)-based polymers equippedwith mussel-inspired adhesion moieties and combining them with the natural wound sealantfibrinogen,we fabricated an adhesive biosynthethic hydrogel with tunable mechanical properties and improvedbonding strength. Degradation of the hydrogels could be adjusted by the ratio of amide to ester linkagesof the catecholic functional group at the POx side chain. In an in vitro disc/ring model for lateral cartilageintegration, a benefit in long-term integration was observed with enhanced degradation of the adhesivewithout the expense of bonding strength. Incorporation of degradable ester linkages in the polymerfacilitated cell invasion and strong deposition of cartilaginous ECM at the defect site. Overall, the resultssuggest that the presented injectable adhesive hydrogel, due to its easy tunability, holds great potentialfor cartilage defect treatment and other medical applications.
두 개의 중첩 레이저 빔을 사용하여 구리 헤어핀의 레이저 용접에서 스패터와 기공의 감소
Oliver Bocksrockera,Nicolai Spekera,Matthias Beraneka,Tim Hessea 한국레이저가공학회 2020 Laser Solutions Vol.23 No.12
헤어핀 기술은 e-Mobility 자동차 부문의 파워 트레인 효율성을 높이기 위한 e-Drive 제조에 새로운 수준의 자유를 제공한다. 구리 헤어핀의 레이저 용접에 대한 실험적 조사를 통해 소위 “2in1-fiber”를 이용한 중첩된 레이저 빔(BrightLine Weld)의 특정 빔 프로파일이 키홀을 안정화시켜 결과적으로 스패터와 기공을 감소시킨다는 것을 알아냈다. 스패터 정량화를 위해 프로세스의 고속 동영상이 사용되었다. 용접 중 기공 생성은 온라인 xRay-imaging을 통해 조사되었다. 관찰에 따르면, 중첩된 레이저빔이 사용될 경우 키홀의 크기가 넓어지는 것으로 나타났다. 그 결과, 키홀의 형태가 시간이 경과함에 따라 안정화되었다. 또한 키홀 형태 덕분에 증발된 물질의 증기를 수월하게 제거할 수 있다. 후자는 키홀이 부푸는 것을 억제하며 따라서 헤어핀 용접 프로세스 중에 스패터와 기공이 형성되는 것을 0에 가깝게 줄일 수 있다.
Oliver P Jones,Philippa J Hoyle 대한치주과학회 2022 Journal of Periodontal & Implant Science Vol.52 No.5
The aim of this systematic review was to evaluate clinical and microbiological outcomes with the use of azithromycin as an adjunct to non-surgical subgingival professional mechanical plaque removal (PMPR) in the treatment of grade C periodontitis. Online database searches using high-level MeSH terms in a PICO structure were conducted along with hand-searching of relevant periodontal journals. Titles and abstracts of identified studies were independently reviewed by both authors and the full texts of studies meeting the inclusion criteria were independently reviewed. In total, 122 studies were identified through searches, of which 6 were included in the qualitative analysis and 4 in the meta-analysis. Three studies included in the meta-analysis were deemed at low risk of bias and 1 at serious risk. There were conflicting results on whether azithromycin reduced the number of subgingival pathogens or detectable subgingival Aggregatibacter actinomycetemcomitans between the included studies. The meta-analysis revealed a statistically significant probing depth reduction difference in favour of azithromycin compared to the control at 3 months (weighted mean difference [WMD]=−0.39 mm; 95% confidence interval [CI], −0.66 to −0.13 mm; I2 =0%) and 12 months (WMD=−1.32 mm; 95% CI, −1.71 to −0.93 mm; I2 =0%). The clinical attachment level change was also statistically significant in favour of azithromycin compared to the control at 3 months (WMD=−0.61 mm; 95% CI, −1.13 to −0.10 mm; I2 =71%) and 12 months (WMD=−0.88 mm; 95% CI, −1.32 to −0.44 mm; I2 =0%). Based upon these results, azithromycin offers additional improvements in some clinical parameters when used in conjunction with subgingival PMPR in patients with aggressive periodontitis over control groups. These improvements appear to be maintained for up to 12 months after treatment completion. However, due to a lack of well-designed studies, the conclusions that can be drawn from the available evidence are limited. Trial Registration: International Prospective Register of Systematic Reviews Identifier: CRD42020168195
Post-Takeover Financing Activities under Financial Repression: Evidence from China
Oliver M. Rui,Julan Du,Sonia M. L. Wong 한국증권학회 2012 Asia-Pacific Journal of Financial Studies Vol.41 No.3
In China’s state-dominated financial system, many firms, especially non-state-owned or private organizations, face serious restrictions in gaining access to bank and equity market financing. This kind of highly discriminatory financial repression policy has induced some unique post-takeover financing activities, which are consistent with the desire to acquire firms in order to capitalize on their privileges in getting access to external finance. Specifically,takeovers by acquirers facing more serious financing obstacles (private acquirers) tend to show less salient symptoms of tunneling and display patterns of more efficient investment than takeovers by acquirers suffering less serious financing obstacles (state acquirers). Market reaction analysis suggests that these takeovers pose different implications for acquirers’ shareholder value, with takeovers by private acquirers being viewed as value enhancing but takeovers by state acquirers being viewed as value reducing.
Filters with random transmittance for improving resolution in filter-array-based spectrometers.
Oliver, J,Lee, Woong-Bi,Lee, Heung-No Optical Society of America 2013 Optics express Vol.21 No.4
<P>In this paper, we introduce a method for improving the resolution of miniature spectrometers. Our method is based on using filters with random transmittance. Such filters sense fine details of an input signal spectrum, which, when combined with a signal processing algorithm, aid in improving resolution. We also propose an approach for designing filters with random transmittance using optical thin-film technology. We demonstrate that the improvement in resolution is 7-fold when using the filters with random transmittance over what was achieved in our previous work.</P>