本論文旨在探討台北犁記餅店在2014年中秋節前夕爆發的餿水油事件中的危機溝通策略，並檢視其危機溝通成效。為探討危機溝通中傳統媒體與新媒體的角色區別，本論文檢視了四大報在餿水油事件中對於台北犁記餅店的線上報導、台北犁記的官方網站與相關官方文件，以及台北犁記的臉書粉絲團。研究結果發現傳統報章媒體已和新媒體高度整合匯流，因此危機事件的傳播速度比起以往更加快速、傳播範圍也更加廣泛。這樣的現象使得公關人員在面對危機事件時，必須更精準地掌握時間做出適當的危機溝通策略，並更加善用社群媒體以和關係人溝通。本論文特別研究台灣中小型本土企業在數位時代中面對危機的溝通策略與成效，提供有別於針對跨國或大型連鎖企業的分析與建議。 / This present case study of Taiwan gutter oil crisis focused on the well-known pastry bakery, Taipei Lee-Chi. This century-old bakery was involved in the food safety crisis during Moon Festival in 2014, resulting in a financial loss of more than NTD 40 million at that time. To explore how traditional and new media play roles in crisis communication for local businesses in Taiwan, the present case study examined relevant news coverage, official documents, and communication activities on social media. More specifically, the analysis included media’s attitude toward the issue shown on major newspaper websites, the responses of Taipei Lee-Chi, and public opinions revealed on its Facebook fan page. The findings suggested that traditional media have converged with new media, and the latter assumes such a powerful influence in crisis communication today. It was found that similar crisis information fast transits from one medium to another, adding more pressure to public relations practitioners to respond to crisis in a timely manner. Social media in particular may not be overlooked and could serve a useful tool in managing corporate crisis. The current study also offered new insights on how local businesses may deal with crisis in the digital age, as most previous crisis studies addressed cases of large national or global corporations.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Problemas durante o processo de aquisição de imagens de AFM têm feito com que pesquisas na área de nanotecnologia busquem a utilização de ferramentas para minimizar esses efeitos degenerativos. Neste sentido, foram desenvolvidas ferramentas computacionais de restauração destas imagens degradadas. Neste trabalho é utilizado o método baseado na Regularização de Tikhonov, cuja aplicação está concentrada principalmente em restaurações de imagens biológicas. A proposta deste trabalho é a utilização deste regularizador também em imagens de interesse em engenharia. Em alguns casos, um pré-processamento anteriormente à aplicação do algoritmo, apresenta boa resposta na restauração das imagens. Na fase de préprocessamento foram utilizados alguns filtros como, filtro de média, filtro de mediana, filtro laplaciano e filtro de média pontual. Com a aplicação deste regularizador em imagens foi possível obter perfis de distribuição dos pixels onde é mostrado que na medida em que se aumenta a carga de dissolução de ferro puro em ácido sulfúrico, percebe-se que a razão de aspecto aumenta e características de superfície ficam mais visíveis. / Problems during the process of acquisition of images of AFM have been doing with that research in the nanotechnology searchs the use of tools to minimize those degenerative effects. Computational tools for restoration of these degraded images have developed, in this work the method is used based on Regularization of Tikhonov. This method is usually used for restoration of biological images. It is proposed the use of this regularization functional also in images of interest in engineering. In some cases, a previously processing to the application of the algorithm, it presents good answer in the restoration of the images. The previously processing phase some were used filters as, average filter, median filter, laplacian filter and filter of punctual average, besides combination of filters. With the application of this regularizator it was possible to obtain profiles of distribution of the pixels where is shown that in the measure in that he increases the dissolution charge of iron in sulphuric acid, it is noticed that the aspect reason increases and surface characteristics are more visible.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Problemas durante o processo de aquisição de imagens de AFM têm feito com que pesquisas na área de nanotecnologia busquem a utilização de ferramentas para minimizar esses efeitos degenerativos. Neste sentido, foram desenvolvidas ferramentas computacionais de restauração destas imagens degradadas. Neste trabalho é utilizado o método baseado na Regularização de Tikhonov, cuja aplicação está concentrada principalmente em restaurações de imagens biológicas. A proposta deste trabalho é a utilização deste regularizador também em imagens de interesse em engenharia. Em alguns casos, um pré-processamento anteriormente à aplicação do algoritmo, apresenta boa resposta na restauração das imagens. Na fase de préprocessamento foram utilizados alguns filtros como, filtro de média, filtro de mediana, filtro laplaciano e filtro de média pontual. Com a aplicação deste regularizador em imagens foi possível obter perfis de distribuição dos pixels onde é mostrado que na medida em que se aumenta a carga de dissolução de ferro puro em ácido sulfúrico, percebe-se que a razão de aspecto aumenta e características de superfície ficam mais visíveis. / Problems during the process of acquisition of images of AFM have been doing with that research in the nanotechnology searchs the use of tools to minimize those degenerative effects. Computational tools for restoration of these degraded images have developed, in this work the method is used based on Regularization of Tikhonov. This method is usually used for restoration of biological images. It is proposed the use of this regularization functional also in images of interest in engineering. In some cases, a previously processing to the application of the algorithm, it presents good answer in the restoration of the images. The previously processing phase some were used filters as, average filter, median filter, laplacian filter and filter of punctual average, besides combination of filters. With the application of this regularizator it was possible to obtain profiles of distribution of the pixels where is shown that in the measure in that he increases the dissolution charge of iron in sulphuric acid, it is noticed that the aspect reason increases and surface characteristics are more visible.

This thesis deals with CT data segmentation using convolutional neural nets and describes the problem of training with limited training sets. User interaction is suggested as means of improving segmentation quality for the models trained on small training sets and the possibility of using transfer learning is also considered. All of the chosen methods help improve the segmentation quality in comparison with the baseline method, which is the use of automatic data specific segmentation model. The segmentation has improved by tens of percents in Dice score when trained with very small datasets. These methods can be used, for example, to simplify the creation of a new segmentation dataset.

<p>Energy minimization approach is widely used in image processing applications.<br />Many image processing problems can be modelled in a form of a minimization<br />problem. This thesis deals with two crucial tasks of image analysis workflows:<br />image restoration and segmentation of images corrupted by blur and noise. Both<br />image restoration and segmentation are modelled as energy minimization<br />problems, where energy function is composed of two parts: data fidelity term and<br />regularization term. The main contribution of this thesis is development of new<br />data fidelity and regularization terms for both image restoration and<br />segmentation tasks.<br />Image restoration methods (non-blind and blind deconvolution and superresolution<br />reconstruction) developed within this thesis are suited for mixed<br />Poisson-Gaussian noise which is encountered in many realistic imaging<br />conditions. We use generalized Anscombe variance stabilization transformation<br />for removing signal-dependency of noise. We propose novel data fidelity term<br />which incorporates variance stabilization transformation process into account.<br />Turning our attention to the regularization term for image restoration, we<br />investigate how sparsity promoting regularization in the gradient domain<br />formulated as Total Variation, can be improved in the presence of blur and mixed<br />Poisson-Gaussian noise. We found that Huber potential function leads to<br />significant improvement of restoration performance.<br />In this thesis we propose new segmentation method, the so called coverage<br />segmentation, which estimates the relative coverage of each pixel in a sensed<br />image by each image component. Its data fidelity term takes into account<br />blurring and down-sampling processes and in that way it provides robust<br />segmentation in the presence of blur, allowing at the same time segmentation at<br />increased spatial resolution. In addition, new sparsity promoting regularization<br />terms are suggested: (i) Huberized Total Variation which provides smooth object<br />boundaries and noise removal, and (ii) non-edge image fuzziness, which<br />responds to an assumption that imaged objects are crisp and that fuzziness is<br />mainly due to the imaging and digitization process.<br />The applicability of here proposed restoration and coverage segmentation<br />methods is demonstrated for Transmission Electron Microscopy image<br />enhancement and segmentation of micro-computed tomography and<br />hyperspectral images.</p> / <p>Поступак минимизације функције енергије је често коришћен за<br />решавање проблема у обради дигиталне слике. Предмет истраживања<br />тезе су два круцијална задатка дигиталне обраде слике: рестаурација и<br />сегментација слика деградираних шумом и замагљењем. И рестaурација<br />и сегментација су моделовани као проблеми минимизације функције<br />енергије која представља збир две функције: функције фитовања<br />података и регуларизационе функције. Главни допринос тезе је развој<br />нових функција фитовања података и нових регуларизационих функција<br />за рестаурацију и сегментацију.<br />Методе за рестаурацију (оне код којих је функција замагљења позната и<br />код којих је функцију замагљења потребно оценити на основу датих<br />података као и методе за реконструкцију слике у супер-резолуцији)<br />развијене у оквиру ове тезе третирају мешавину Поасоновог и Гаусовог<br />шума који се појављује у многобројним реалистичним сценаријима. За<br />третирање такве врсте шума користили смо нелинеарну трансформацију<br />и предложили смо нову функцију фитовања података која узима у обзир<br />такву трансформацију. У вези са регуларизационим функцијама смо<br />тестирали хипотезу да се функција Тоталне Варијације која промовише<br />ретку слику у градијентном домену може побољшати уколико се користе<br />тзв. потенцијалне функције. Показали смо да се употребом Хуберове<br />потенцијалне функције може значајно побољшати квалитет рестауриране<br />слике која је деградирана замагљењем и мешавином Поасоновог и<br />Гаусовог шума.<br />У оквиру тезе смо предложили нову методу сегментације која допушта<br />делимичну покривеност пиксела објектом. Функција фитовања података<br />ове методе укључује и модел замагљења и смањења резолуције. На тај<br />начин је постигнута робустност сегментације у присуству замагљења и<br />добијена могућност сегментирања слике у супер-резолуцији. Додатно,<br />нове регуларизационе функције које промовишу ретке репрезентације<br />слике су предложене.<br />Предложене методе рестаурације и сегментације која допушта делимичну<br />покривеност пиксела објектом су примењене на слике добијене помоћу<br />електронског микроскопа, хиперспектралне слике и медицинске ЦТ слике.</p> / <p>Postupak minimizacije funkcije energije je često korišćen za<br />rešavanje problema u obradi digitalne slike. Predmet istraživanja<br />teze su dva krucijalna zadatka digitalne obrade slike: restauracija i<br />segmentacija slika degradiranih šumom i zamagljenjem. I restauracija<br />i segmentacija su modelovani kao problemi minimizacije funkcije<br />energije koja predstavlja zbir dve funkcije: funkcije fitovanja<br />podataka i regularizacione funkcije. Glavni doprinos teze je razvoj<br />novih funkcija fitovanja podataka i novih regularizacionih funkcija<br />za restauraciju i segmentaciju.<br />Metode za restauraciju (one kod kojih je funkcija zamagljenja poznata i<br />kod kojih je funkciju zamagljenja potrebno oceniti na osnovu datih<br />podataka kao i metode za rekonstrukciju slike u super-rezoluciji)<br />razvijene u okviru ove teze tretiraju mešavinu Poasonovog i Gausovog<br />šuma koji se pojavljuje u mnogobrojnim realističnim scenarijima. Za<br />tretiranje takve vrste šuma koristili smo nelinearnu transformaciju<br />i predložili smo novu funkciju fitovanja podataka koja uzima u obzir<br />takvu transformaciju. U vezi sa regularizacionim funkcijama smo<br />testirali hipotezu da se funkcija Totalne Varijacije koja promoviše<br />retku sliku u gradijentnom domenu može poboljšati ukoliko se koriste<br />tzv. potencijalne funkcije. Pokazali smo da se upotrebom Huberove<br />potencijalne funkcije može značajno poboljšati kvalitet restaurirane<br />slike koja je degradirana zamagljenjem i mešavinom Poasonovog i<br />Gausovog šuma.<br />U okviru teze smo predložili novu metodu segmentacije koja dopušta<br />delimičnu pokrivenost piksela objektom. Funkcija fitovanja podataka<br />ove metode uključuje i model zamagljenja i smanjenja rezolucije. Na taj<br />način je postignuta robustnost segmentacije u prisustvu zamagljenja i<br />dobijena mogućnost segmentiranja slike u super-rezoluciji. Dodatno,<br />nove regularizacione funkcije koje promovišu retke reprezentacije<br />slike su predložene.<br />Predložene metode restauracije i segmentacije koja dopušta delimičnu<br />pokrivenost piksela objektom su primenjene na slike dobijene pomoću<br />elektronskog mikroskopa, hiperspektralne slike i medicinske CT slike.</p>

Text in English, abstracts and keywords in English, Afrikaans and Zulu / Secondary educational institutions need to constantly scan their environment for crises that could hamper their operations and hinder the achievement of their organisational objectives. These institutions should also engage their strategic stakeholders in a mixed motive communication to collaboratively discuss the crises and find amicable solutions; thereby avoiding crises like the proliferating student strikes in secondary educational institutions in Kenya. This study explored the need for a customised Proactive Crisis Communication Process (PCCP) framework for secondary educational institutions in Kenya to avoid student strikes. A two-phased approach was adopted to collect the data. The first phase involved 12 one-on-one semi-structured interviews with the principals of the secondary educational institutions in Mirangine Sub-County, while the second phase involved five focus group discussions with the students of Ruiru Secondary School. The results indicated that student strikes in secondary educational institutions in Kenya were proliferating and that despite this, these institutions lack proactive measures to avoid strikes. Hence, this study posited a PCCP framework that proposed various proactive measures to avoid student strikes in secondary educational institutions in Kenya. / Sekondêre opvoedkundige instellings moet konstant hul omgewing ondersoek vir krisisse wat hul bedrywighede kan belemmer en die bereiking van hul organisatoriese doelwitte kan verhinder. Hierdie instellings moet ook hul strategiese belanghebbers by gemengdemotief- kommunikasie betrek om gesamentlik die krisisse te bespreek en minlike oplossings te vind; en sodoende krisisse soos die toenemende studentestakings in sekondêre opvoedkundige instellings in Kenia te vermy. In hierdie studie is die nodigheid vir ʼn doelgemaakte ProaktieweKrisiskommunikasieproses (PCCP)-raamwerkvir sekondêre opvoedkundige instellings in Kenia ondersoek om studentestakings te voorkom. ʼn Tweefase-benadering is gevolg om die data in te samel. Die eerste fase het 12 halfgestruktureerde onderhoude behels wat een-tot-een met die hoofde van die sekondêre opvoedkundige instellingsin Mirangine Sub-Countygevoer is, terwyl die tweede fase bestaan het uit vyf fokusgroepbesprekings met die studente van RuiruSecondarySchool. Die resultate het getoon dat studentestakings in sekondêre opvoedkundige instellingsin Kenia vinnig toeneem en dat hierdie instellings, ten spyte daarvan, nie oor proaktiewe maatstawwe beskik om stakings af te weer nie.Gevolglik het hierdie studie ʼn PCCP-raamwerk aangeneem wat verskeie proaktiewe maatstawwe voorstel om stakings deur studente in sekondêre opvoedkundige instellings in Kenia te verhoed. / Izikhungo zemfundoyomkhakhawamasekhondari kumele zihlale ziqaphele ukuthi akukho yini endaweniezikuyookungasusaudweshubesekuphazamisaukusebenzakwazokuvimbe impumeleloyazoezinhloswenizayo.Lezizikhungokumelezibuyezisebenzisane nabathintekayo balawule amasu okusebenza ukuba kubenokuxhumana okunhlobonhlobo kuxoxwe ngokubambisana ngodweshu olungavela nokuthi lungasonjululwa kanjani ngendlela egculisayo; ngaleyo ndlela-ke ingagwemeka imibhikisho yabafundi elokhu isabalala ezikhungwenj zamasekhondari eKenya. Lolu cwaningoluhlola isidingo sohlaka lwekhethelo lokusheshe kusukunyelweudweshu lungakenzeki,i-Proactive Crisis Communication Process (PCCP) olungasebenza ezikhungweni zemfundo yamasekhondari eKenya ukuze kugwenywe imibhikisho yabafujni. Kwemukelwaindlela ezigaba zimbili yokuqoqainingwane. Isigaba sokuqala ngokuxoxisana okuyi-12 komuntu ebhekene nomuntu okuthi akuhleleke nje, okwenziwa nothishanhloko bezukhungo zemfundi yamasekhondaribaseMiringane Sub-County, kanti isigaba sesibili sabandakanya izingxoxo eziyisihlanu zamaqembu agxike kokuthile nje, zenziwa nabafundi besikole iRuri Secondary School. Imiphumela yaveza ukuthi imibhikisho ezikhungweni zemfundo yamasekhondari eKenya yabe yanda nokuthi nangaphandle kwalokhu izikhungo lezi zazingenazo izinyathelo ezingazithatha ngaphambi kwesikhathi ukuvimba ukwenziwa kwemibhikisho. Yikho-ke lolu cwaningo luphakamisa uhlaka lwe-PCCP oluncoma izinyathelo ezahlukene okumele zisheshe zithathwe ukugwema imibhikisho yabafundi ezikhungweni zamasekhondari eKenya. / Communication / M.A. (Communication)

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