TY  - JOUR
A1  - Jasniak, Michael
A1  - Ermakova, Tatiana
A1  - Baierl, Ronny
A1  - Halberstadt, Jantje
T1  - What drives social entrepreneurial appraisal among hearing-impaired individuals?
JF  - International Journal of Entrepreneurial Venturing
N2  - Involvement of disadvantaged individuals into entrepreneurship facilitates their social integration into mainstream societies. The present study addresses the drivers of social entrepreneurial appraisal among hearing-impaired individuals within a unique social minority environment. In prior research, social appraisal was empirically shown to determine social entrepreneurial intention. Adopting the theory of planned behaviour, this study investigates the impact of entrepreneurial self-efficacy, general social support and perceived barriers on social entrepreneurial appraisal. Based on a survey with 221 respondents, our results demonstrate that social entrepreneurial appraisal of hearing-impaired individuals result from their entrepreneurial self-efficacy and general social support. In terms of taking advantage of social opportunities, importance should be given to the role of entrepreneurial education and heterogeneous networks across minorities.
KW  - social entrepreneurial appraisal
KW  - social entrepreneurship
KW  - social minority entrepreneurship
KW  - hearing-impaired individuals
KW  - disabled minority sample
Y1  - 2018
U6  - https://doi.org/10.1504/IJEV.2018.092734
SN  - 1742-5360
SN  - 1742-5379
VL  - 10
IS  - 2
SP  - 236
EP  - 255
PB  - Inderscience Enterprises Ltd
CY  - Geneva
ER  - 
TY  - JOUR
A1  - Caffier, Philipp P.
A1  - Salmen, Tatjana
A1  - Ermakova, Tatiana
A1  - Forbes, Eleanor
A1  - Ko, Seo-Rin
A1  - Song, Wen
A1  - Gross, Manfred
A1  - Nawka, Tadeus
T1  - Phonomicrosurgery in Vocal Fold Nodules
BT  - Quantification of Outcomes in Professional and Non-Professional Voice Users
JF  - Medical Problems of Performing Artists
N2  - There are few data demonstrating the specific extent to which surgical intervention for vocal fold nodules (VFN) improves vocal function in professional (PVU) and non-professional voice users (NVU). The objective of this study was to compare and quantify results after phonomicrosurgery for VFN in these patient groups. METHODS: In a prospective clinical study, surgery was performed via microlaryngoscopy in 37 female patients with chronic VFN manifestations (38±12 yrs, mean±SD). Pre- and postoperative evaluations of treatment efficacy comprised videolaryngostroboscopy, auditory-perceptual voice assessment, voice range profile (VRP), acoustic-aerodynamic analysis, and voice handicap index (VHI-9i). The dysphonia severity index (DSI) was compared with the vocal extent measure (VEM). RESULTS: PVU (n=24) and NVU (n=13) showed comparable laryngeal findings and levels of suffering (VHI-9i 16±7 vs 17±8), but PVU had a better pretherapeutic vocal range (26.8±7.4 vs 17.7±5.1 semitones, p<0.001) and vocal capacity (VEM 106±18 vs 74±29, p<0.01). Three months postoperatively, all patients had straight vocal fold edges, complete glottal closure, and recovered mucosal wave propagation. The mean VHI-9i score decreased by 8±6 points. DSI increased from 4.0±2.4 to 5.5±2.4, and VEM from 95±27 to 108±23 (p<0.001). Both parameters correlated significantly (rs=0.82). The average vocal range increased by 4.1±5.3 semitones, and the mean speaking pitch lowered by 0.5±1.4 semitones. CONCLUSIONS: These results confirm that phonomicrosurgery for VFN is a safe therapy for voice improvement in both PVU and NVU who do not respond to voice therapy alone. Top-level artistic capabilities in PVU were restored, but numeric changes of most vocal parameters were considerably larger in NVU.
Y1  - 2018
U6  - https://doi.org/10.21091/mppa.2017.4035
SN  - 0885-1158
SN  - 1938-2766
VL  - 32
SP  - 187
EP  - 194
PB  - Science & Medicine, Inc.
CY  - Narberth
ER  - 
TY  - JOUR
A1  - Ermakova, Tatiana
A1  - Fabian, Benjamin
A1  - Zarnekow, Ruediger
T1  - Improving Individual Acceptance of Health Clouds through Confidentiality Assurance
JF  - Applied clinical informatics
N2  - Background: Cloud computing promises to essentially improve healthcare delivery performance. However, shifting sensitive medical records to third-party cloud providers could create an adoption hurdle because of security and privacy concerns. Methods: We empirically investigate our research question by a survey with over 260 full responses. For the setting with a high confidentiality assurance, we base on a recent multi-cloud architecture which provides very high confidentiality assurance through a secret-sharing mechanism: Health information is cryptographically encoded and distributed in a way that no single and no small group of cloud providers is able to decode it.
KW  - Cloud computing
KW  - cloud service
KW  - cloud storage
KW  - data security
KW  - privacy
KW  - confidentiality
KW  - acceptance process
Y1  - 2016
U6  - https://doi.org/10.4338/ACI-2016-07-RA-0107
SN  - 1869-0327
VL  - 7
SP  - 983
EP  - 993
PB  - Schattauer
CY  - Stuttgart
ER  - 
TY  - JOUR
A1  - Dombrowski, Sebastian
A1  - Ermakova, Tatiana
A1  - Fabian, Benjamin
T1  - Graph-based analysis of cloud connectivity at the internet protocol level
JF  - International Journal of Communication Networks and Distributed Systems (IJCNDS)
N2  - Internet connectivity of cloud services is of exceptional importance for both their providers and consumers. This article demonstrates the outlines of a method for measuring cloud-service connectivity at the internet protocol level from a client's perspective. For this, we actively collect connectivity data via traceroute measurements from PlanetLab to several major cloud services. Furthermore, we construct graph models from the collected data, and analyse the connectivity of the services based on important graph-based measures. Then, random and targeted node removal attacks are simulated, and the corresponding vulnerability of cloud services is evaluated. Our results indicate that cloud service hosts are, on average, much better connected than average hosts. However, when interconnecting nodes are removed in a targeted manner, cloud connectivity is dramatically reduced.
KW  - cloud computing
KW  - connectivity
KW  - availability
KW  - reliability
KW  - internet topology
KW  - graph analysis
KW  - complex networks
Y1  - 2019
U6  - https://doi.org/10.1504/IJCNDS.2019.100644
SN  - 1754-3916
SN  - 1754-3924
VL  - 23
IS  - 1
SP  - 117
EP  - 142
PB  - Inderscience Enterprises Ltd
CY  - Geneva
ER  - 
TY  - JOUR
A1  - Junghanns, Philipp
A1  - Fabian, Benjamin
A1  - Ermakova, Tatiana
T1  - Engineering of secure multi-cloud storage
JF  - Computers in industry : an international, application oriented research journal
N2  - This article addresses security and privacy issues associated with storing data in public cloud services. It presents an architecture based on a novel secure cloud gateway that allows client systems to store sensitive data in a semi-trusted multi-cloud environment while providing confidentiality, integrity, and availability of data. This proxy system implements a space-efficient, computationally-secure threshold secret sharing scheme to store shares of a secret in several distinct cloud datastores. Moreover, the system integrates a comprehensive set of security measures and cryptographic protocols to mitigate threats induced by cloud computing. Performance in practice and code quality of the implementation are analyzed in extensive experiments and measurements. (C) 2016 Elsevier B.V. All rights reserved.
KW  - Cloud computing
KW  - Data exchange
KW  - Security
KW  - Privacy
Y1  - 2016
U6  - https://doi.org/10.1016/j.compind.2016.09.001
SN  - 0166-3615
SN  - 1872-6194
VL  - 83
SP  - 108
EP  - 120
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Salmen, T.
A1  - Ermakova, Tatiana
A1  - Schindler, A.
A1  - Ko, S-R.
A1  - Göktas, O.
A1  - Gross, M.
A1  - Nawka, T.
A1  - Caffier, P. P.
T1  - Efficacy of microsurgery in Reinke's oedema evaluated by traditional voice assessment integrated with the Vocal Extent Measure (VEM)
JF  - Acta Otorhinolaryngol Italica
N2  - There are few data analysing to what specific extent phonomicrosurgery improves vocal function in patients suffering from Reinke's oedema (RE). The recently introduced parameter vocal extent measure (VEM) seems to be suitable to objectively quantify vocal performance. The purpose of this clinical prospective study was to investigate the outcomes of phonomicrosurgery in 60 RE patients (6 male, 54 female; 56 ± 8 years ([mean ± SD]) by analysing its effect on subjective and objective vocal parameters with particular regard to VEM. Treatment efficacy was evaluated at three months after surgery by comparing pre- and postoperative videolaryngostroboscopy (VLS), auditory-perceptual assessment (RBH-status), voice range profile (VRP), acoustic-aerodynamic analysis and patient's self-assessment using the voice handicap index (VHI-9i). Phonomicrosurgically, all RE were carefully ablated. VLS revealed removal or substantial reduction of oedema with restored periodic vocal fold vibration. All subjective and most objective acoustic and aerodynamic parameters significantly improved. The VEM increased on average from 64 ± 37 to 88 ± 25 (p #x003C; 0.001) and the dysphonia severity index (DSI) from 0.5 ± 3.4 to 2.9 ± 1.9. Both parameters correlated significantly with each other (rs = 0.70). RBH-status revealed less roughness, breathiness and overall grade of hoarseness (2.0 ± 0.7 vs 1.3 ± 0.7). The VHI-9i-score decreased from 18 ± 8 to 12 ± 9 points. The average total vocal range enlarged by 4 ± 7 semitones, and the mean speaking pitch rose by 2 ± 4 semitones. These results confirm that: (1) the use of VEM in RE patients objectifies and quantifies their vocal capacity as documented in the VRP, and (2) phonomicrosurgery is an effective, objectively and subjectively satisfactory therapy to improve voice in RE patients.
KW  - Voice function diagnostics
KW  - Voice range profile quantification
KW  - Vocal Extent Measure (VEM)
KW  - Reinke’s oedema
KW  - Phonomicrosurgery
Y1  - 2018
U6  - https://doi.org/10.14639/0392-100X-1544
SN  - 0392-100X
SN  - 1827-675X
VL  - 38
IS  - 3
SP  - 194
EP  - 203
PB  - Pacini editore
CY  - Pisa
ER  -