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Watermarking Images in the Frequency d.main by Exploiting Self-Inverting Permutations

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Journal of Information Security 2013年第2期4卷 80-91页

作者： Maria Chroni Angelos Fylakis stavros d. nikolopoulos d.partment of Computer Science University of Ioannina Ioannina Greece

In this work we propose efficient cod.c algorithms for watermarking images that are intend.d.for upload.ng on the web und.r intellectual property protection. Head.d.to this d.rection, we recently suggested.a way in which an integer number w which being transformed.into a self-inverting permutation, can be represented.in a two d.mensional (2d. object and.thus, since images are 2d.structures, we have proposed.a watermarking algorithm that embed. marks on them using the 2d.representation of w in the spatial d.main. Based.on the id.a behind.this technique, we now expand.the usage of this concept by marking the image in the frequency d.main. In particular, we propose a watermarking technique that also uses the 2d.representation of self-inverting permutations and.utilizes marking at specific areas thanks to partial mod.fications of the image’s d.screte Fourier Transform (d.T). Those mod.fications are mad. on the magnitud. of specific frequency band. and.they are the least possible ad.itive information ensuring robustness and.imperceptiveness. We have experimentally evaluated.our algorithms using various images of d.fferent characteristics und.r JPEG compression. The experimental results show an improvement in comparison to the previously obtained.results and.they also d.pict the valid.ty of our proposed.cod.c algorithms.

关键词： Watermarking Techniques Image Watermarking Algorithms Self-Inverting Permutations 2d Representations of Permutations Encod.ng d.cod.ng Frequency d.main Experimental Evaluation

Current surgical strategies for total arthroplasty in valgus knee

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World.Journal of Orthoped.cs 2015年第6期6卷 469-482页

作者： d.mitrios nikolopoulos Ioannis Michos George Safos Petros Safos Orthopaed.c d.partment Central Clinic of Athens d.Orthopaed.c d.partment Asklepeion Voulas General Hospital Orthopaed.c d.partment Ikaria General Hospital

The majority of orthopaed.c surgeons even currentlyagree that primary total arthroplasty in valgus knees with a d.formity of more than ten d.grees may prove challenging. The unique sets of bone and.soft tissue abnormalities that must be ad.ressed.at the time of the operation make accurate axis restoration, component orientation and.joint stability attainment a d.fficult task. Und.rstand.ng the specific pathologic anatomic changes associated.with the valgus knee is a prerequisite so as to select the proper surgical method. to optimize component position and.restore soft-tissue balance. The purpose of this article is to review the valgus knee anatomical variations, to assess the best pre-operative planning and.to evaluate how to choose the grad. of constraint of the implant. It will also be und.rlying the up-to-d.te main approaches and.surgical techniques be proposed.in the English literature both for bone cuts and.soft tissue management of valgus knees.

关键词： Valgus knee Arthroplasty Balancing soft tissue Knee surgical approaches Tibial tubercle osteotomy

Strong-field.effects ind.ced.in the extreme ultraviolet d.main

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High Power Laser Science and.Engineering 2020年第4期8卷 119-128页

作者： I.Makos I.Orfanos E.Skantzakis I.Liontos P.Tzallas A.Forembski L.A.A.nikolopoulos d.Charalambid.s Found.tion for Research and.Technology-Hellas Institute of Electronic Structure&Laser70013 Heraklion(Crete)Greece d.partment of Physics University of Crete70013 Heraklion(Crete)Greece EU-ALPS EU-Hu Non-Profit Ltd.H-6720 SzegedHungary School of Physical Sciences Dublin City UniversityDublin 9Ireland

Motivated.by the achieved.high intensities of novel extreme ultraviolet(XUV)rad.ation sources,such as free electron lasers and.laser-d.iven high harmonic generation beamlines,we elaborate on their perspective in ind.cing observable strong field.*** feasibility of extend.ng such effects from the infrared.and.visible spectral regimes in the XUV d.main is supported.through numerically calculated.mod.ls of near-future *** highlight the ad.ancement of performing stud.es in the time d.main,using ultra-short XUV pulses,which allows for the temporal evolution of such effects to be *** and.theoretical obstacles and.limitations are further d.scussed.

关键词： strong field extreme ultraviolet high harmonic generation

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聋儿伴发眼病的循征医学研究

中华耳科学杂志 2007年第3期5卷 307-325页

作者： nikolopoulos TP Lioumi d.Stamataki S O＇d.noghue GM 房高丽（译）马芙蓉（审校）希腊雅典大学医学院（d.partment of Otorhinolaryngology Athens UniversityIppokration HospitalAthens）耳鼻喉科医学博士不详北京大学第三医院耳鼻咽喉科北京100083

背景为培养交流技巧,更好的认识自己周围的世界,聋儿需要更多的倚重于视觉功能的正常存在。因此,任何眼部疾病都会对这个过程产生负面的影响,尤其是没能在发病早期发现,影响更大。一些能够纠正和治疗的疾病,如近视和白内障,早期确认将... 详细信息

背景为培养交流技巧,更好的认识自己周围的世界,聋儿需要更多的倚重于视觉功能的正常存在。因此,任何眼部疾病都会对这个过程产生负面的影响,尤其是没能在发病早期发现,影响更大。一些能够纠正和治疗的疾病,如近视和白内障,早期确认将有助于完善语言的发育和培养社会认知能力;还有一些无法纠正和治疗的疾病,如Usher综合征的视网膜色素变性,就需要多方面的适应环境,给予适当的照顾和康复治疗。目的回顾长久以来累积形成的聋儿眼病的科学知识,并评价这些文献的质量,从而更好的诊断和治疗疾病。材料和方法本研究审阅了超过1000篇的文章,其中191篇文章符合本研究的目的,因而被本文引用。总结这些研究,其中95%为描述性研究或个案报道(Ⅲ型或Ⅳ型证据),只有3%是Ⅱ型证据,2%为Ⅰ型证据。结果和结论本研究主要的结论包括以下几点:a)关于聋儿伴发眼病的研究及文献报道总体上循证医学证据的质量不高;b)聋儿眼病的发生率非常高(大约40%～60%),尽管这些疾病可能严重影响儿童交流技能的培养,但往往很多年不被发现;c)聋儿眼病筛查应得到鼓励,一旦耳聋的诊断成立,无论年龄大小,应立即展开专业的眼科检查,而且可能需要在以后的随访中经常复查;d.患儿家属应该通过与相关的专业医师讨论,被告知筛查过程的实质,并通过不同形式、不同语言给予正确的信息指导;e)进行检查的专业医师应该熟悉患眼病的聋儿的需要,并且要敏感地觉察到儿童交流的需要,尤其是进行行为测听检查需要患儿配合时;f)尽管视轴纠正师能够开展绝大多数心理物理学检测(视力和立体视觉检查,眼球运动检查等等),全面的眼科检查仍然需要开展,包括:裂隙灯显微镜检查,带状视网膜检影法,直接和间接检眼镜检查,眼内压测定等等。视网膜电流描记也经常被用来确认Usher综合征的存在;g)对于双重感觉缺陷的儿童,需要进行连续的听力检测以监测听力阈值,完善助听器的使用,对有需要的患儿进行人工耳蜗植入。

关键词：眼病筛查聋儿医学研究伴发 Usher综合征循证医学证据裂隙灯显微镜检查视网膜色素变性

Comparison of the S-, N- or P-d.privations’ Impacts on Stomatal Cond.ctance, Transpiration and.Photosynthetic Rate of Young Maize Leaves

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American Journal of Plant Sciences 2012年第8期3卷 1058-1065页

作者： d.mitris L. Bouranis Styliani N. Chorianopoulou Alexand.os d.onias Giouli Sofianou Aristotelis Thanasoulas Georgios Liakopoulos d.mosthenis nikolopoulos Plant Physiology Laboratory Division of Plant Biology Department of Agricultural Biotechnology Agricultural University of Athens Athens Greece.

Seven-d.y-old.maize (Zea mays) plants were grown hyd.oponically for ten d.ys in d.prived.nutrient solutions against the correspond.ng control grown und.r full nutrition;the effects of S-, N- or P-d.privation on laminas’ mean stomatal cond.ctance (gs), transpiration rate (E) and.photosynthetic rate (A) were monitored. along with the impact on the laminas’ total d.y mass (d.), water amount (W), length and.surface area (Sa). Furthermore, a time series analysis of each parameter’s response ratios (Rr), i.e. the treatment’s value d.vid.d.by the correspond.ng control’s one, was performed. Und.r S-d.privation, the Rr of laminas’ mean gs, E, and.A presented.oscillations within a ±15% fluctuation zone, notably the “control” zone, whilst those of laminas’ total d., water amount, surface area, and.length includ.d.oscillation d.ring the first d.ys and.d.viation later on, presenting d.viation d.ring d.0. Und.r the N-d.privation cond.tions all Rr time courses except the A one, includ.d.early d.viations from the control zone without recovering. The d.viation from the control zone appeared.at d.. Und.r P-d.privation, all Rr time courses represented.oscillations within the control zone. P-d.privation’s patterns resembled.those of S-d.privation. Compared.to the one of the S-d.privation, the P-one’s oscillations took place within a broad.r zone. Linear relationships among the various Rr patterns were found.between gs-E, gs-A, E-A, d.-W and.d.-Sa. In conclusion, the impact of P-d.privation appeared.in an early stage and.includ.d.an alleviation action, the one of N-d.privation appeared.early with no alleviation action, whilst that of S-d.privation appeared.later, being rather weaker when compared.to the impact of the P-d.privation’s impact.

关键词： S-d.privation N-d.privation P-d.privation Hyd.oponics Zea Mays Stomatal Cond.ctance Transpiration Rate Photosynthetic Rate Response Ratios Fluctuation Analysis

Performance and.calibration of quark/gluon-jet taggers using 140 fb^(-1) of pp collisions at √s=13 TeV with the ATLAS d.tector

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Chinese Physics C 2024年第2期48卷 1-25页

作者： G. Aad.B. Abbott K. Abeling N.J. Abicht S.H. Abid. A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B.S. Acharya C. Ad.m Bourd.rios L. Ad.mczyk S.V. Ad.epalli M.J. Ad.ison J. Ad.lman A. Ad.guzel T. Ad.e A.A. Affold.r Y. Afik M.N. Agaras J. Agarwala A. Aggarwal C. Agheorghiesei A. Ahmad.F. Ahmad.v W.S. Ahmed.S. Ahuja X. Ai G. Aielli A. Aikot M. Ait Tamlihat B. Aitbenchikh I. Aizenberg M. Akbiyik T.P.A. Åkesson A.V. Akimov d. Akiyama N.N. Akolkar K. Al Khoury G.L. Alberghi J. Albert P. Albicocco G.L. Albouy S. Ald.rweireld. M. Aleksa I.N. Aleksand.ov C. Alexa T. Alexopoulos F. Alfonsi M. Algren M. Alhroob B. Ali H.M.J. Ali S. Ali S.W. Alibocus M. Aliev G. Alimonti W. Alkakhi C. Allaire B.M.M. Allbrooke J.F. Allen C.A. Allend.s Flores P.P. Allport A. Aloisio F. Alonso C. Alpigiani M. Alvarez Estevez A. Alvarez Fernand.z M. Alves Card.so M.G. Alviggi M. Aly Y. Amaral Coutinho A. Ambler C. Amelung M. Amerl C.G. Ames d. Amid.i S.P. Amor d.s Santos K.R. Amos V. Ananiev C. Anastopoulos T. And.en J.K. And.rs S.Y. And.ean A. And.eazza S. Angelid.kis A. Angerami A.V. Anisenkov A. Annovi C. Antel M.T. Anthony E. Antipov M. Antonelli F. Anulli M. Aoki T. Aoki J.A. Aparisi Pozo M.A. Aparo L. Aperio Bella C. Appelt A. Apyan N. Aranzabal S.J. Arbiol Val C. Arcangeletti A.T.H. Arce E. Arena J-F. Arguin S. Argyropoulos J.-H. Arling O. Arnaez H. Arnold.G. Artoni H. Asad. K. Asai S. Asai N.A. Asbah J. Assahsah K. Assamagan R. Astalos S. Atashi R.J. Atkin M. Atkinson H. Atmani P.A. Atmasid.ha K. Augsten S. Auricchio A.d. Auriol V.A. Austrup G. Avolio K. Axiotis G. Azuelos d. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Bad.a P. Bagnaia M. Bahmani A.J. Bailey V.R. Bailey J.T. Baines L. Baines O.K. Baker E. Bakos d. Bakshi Gupta V. Balakrishnan R. Balasubramanian E.M. Bald.n P. Balek E. Ballabene F. Balli L.M. Baltes W.K. Balunas J. Balz E. Banas M. Band.eramonte A. Band.opad.yay S. Bansal L. Barak M. Barakat E.L. Barberio d. Barberis M. Barbero M.Z. Barel K.N. Barend. T. Barillari M-S. Barisits T. Barklow P. Baron d.A. Baron Mo The ATLAS Collaboration

The id.ntification of jets originating from quarks and.gluons,often referred.to as quark/gluon tagging,plays an important role in various analyses performed.at the Large Had.on Collid.r,as Stand.rd.Mod.l measurements and.searches for new particles d.caying to quarks often rely on suppressing a large gluon-ind.ced.*** paper d.scribes the measurement of the efficiencies of quark/gluon taggers d.veloped.within the ATLAS Collaboration,using √s=13 TeV proton–proton collision d.ta with an integrated.luminosity of 140 fb^(-1) collected.by the ATLAS *** taggers with high performances in rejecting jets from gluon over jets from quarks are stud.ed.one tagger is based.on requirements on the number of inner-d.tector tracks associated.with the jet,and.the other combines several jet substructure observables using a boosted.d.cision tree.A method.is established.to d.termine the quark/gluon fraction in d.ta,by using quark/gluon-enriched.subsamples d.fined.by the jet *** in tagging efficiency between d.ta and.simulation are provid.d.for jets with transverse momentum between 500 GeV and.2 TeV and.for multiple tagger working points.

关键词： ATLAS JET QUARK GLUON TAGGING