Publications

Google Scholar Profile

BibTex: 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2005, 2004

Sharma, S., Beelen, T., & Truong, K. P. (2023). Robot-Supported Information Search: Which Conversational Interaction Style do Children Prefer? Accepted to Proceedings of HRI’23 (Late Breaking Reports).
Trouvain, J., Werner, R., & Truong, K. P. (2022). Inhalation Noises as Endings of Laughs in Conversational Speech. Proceedings of the Workshop on Smiling and Laughter across Contexts and the Life-Span within the 13th Language Resources and Evaluation Conference, 28–29.
Martikainen, K., Karlgren, J., & Truong, K. P. (2022). Exploring audio-based stylistic variation in podcasts. Proceedings of Interspeech 2022, 2343–2347.
Pompe, B. L., Velner, E., & Truong, K. P. (2022). The robot that showed remorse: repairing trust with a genuine apology. Proceedings of RO-MAN 2022, 260–265.
Velner, E., Truong, K. P., & Evers, V. (2021). Speaking of trust - speech as a measure of trust. Proceedings of The Road to a Successful HRI: AI, Trust and EthicS - TRAITS Workshop (HRI'21 Workshop).
Neidlinger, K., Koenderink, S., & Truong, K. P. (2021). Give the Body a Voice: Co-design with Profound Intellectual and Multiple Disabilities to Create Multisensory Wearables. Proceedings of CHI EA 2021.
de Boer, J. N., Voppel, A. E., Brederoo, S. G., Schnack, H. G., Truong, K. P., Wijnen, F. N. K., & Sommer, I. E. C. (2021). Acoustic speech markers for schizophrenia-spectrum disorders: a diagnostic and symptom-recognition tool. Psychological Medicine, 1–11.
Jansen, M.-P., Truong, K. P., & Heylen, D. K. J. (2021). How Familiarity Influences the Frequency, Temporal Dynamics and Acoustics of Laughter. Proceedings of the 9th International Conference on Affective Computing and Intelligent Interaction (ACII), 1–8.
Velner, E., Truong, K. P., & Evers, V. (2021). Sound and Sensibility: To Beep or Not to Beep. Proceedings of Sound in HRI Workshop (HRI'21 Workshop).
Hover, Q. R. M., Velner, E., Beelen, T., Boon, M., & Truong, K. P. (2021). Uncanny, Sexy, and Threatening Robots: The Online Community's Attitude to and Perceptions of Robots Varying in Humanlikeness and Gender. Proceedings of the 16th ACM/IEEE International Conference on Human-Robot Interaction (HRI2021), 119–128.
Truong, K. P., Heylen, D. K. J., Czerwinski, M., Berthouze, N., Chetouani, M., & Nakano, M. (Eds.). (2020). ICMI '20: International Conference on Multimodal Interaction, Virtual Event, The Netherlands, October 25-29, 2020. ACM.
Wiegersma, S., Nijdam, M. J., van Hessen, A. J., Truong, K. P., Veldkamp, B. P., & Olff, M. (2020). Recognizing hotspots in Brief Eclectic Psychotherapy for PTSD by text and audio mining. European Journal of Psychotraumatology, 11(1), 1726672.
Jansen, M.-P., Truong, K. P., & Heylen, D. K. J. (2020). Introducing MULAI: A Multimodal Database of Laughter during Dyadic Interactions. Proceedings of The 12th Language Resources and Evaluation Conference (LREC), 4333–4342.
Catala, A., Nazareth, D. S., Félix, P., Truong, K. P., & Westerhof, G. J. (2020). Emobook: A Multimedia Life Story Book App for Reminiscence Intervention. Proceedings of Mobile HCI'20, 1–4.
De Vries, R. A. J., Truong, K. P., Kim, J., & Evers, V. (2019). You Can Do It! - Crowdsourcing Motivational Speech and Text Messages. In V.-J. Khan, K. Papangelis, I. Lykourentzou, & P. Markopoulos (Eds.), Macrotask Crowdsourcing: Engaging the Crowds to Address Complex Problems (pp. 217–231). Springer International Publishing.
Neidlinger, K., Toussaint, L., Dertien, E., Truong, K. P., Hermens, H., & Evers, V. (2019). Emotional Prosthesis for Animating Awe through Performative Biofeedback. Proceedings of International Symposium on Wearable Computers (ISWC) - *Best Functional Design Award*, 312–317.
Truong, K. P., Trouvain, J., & Jansen, M.-P. (2019). Towards an annotation scheme for complex laughter in speech corpora. Proceedings of Interspeech, 529–533.
Nazareth, D. S., Burghardt, C., Capra, A., Cristoforetti, P., Lam, W., van Waterschoot, J. B., Westerhof, G. J., & Truong, K. P. (2019). Babbelbord: A Personalized Conversational Game for People with Dementia. Proceedings of Dementia Lab 2019. Making Design Work: Engaging with Dementia in Context, 169–173.
Nazareth, D. S., Tournier, E., Leimkötter, S., Janse, E., Heylen, D. K. J., Westerhof, G. J., & Truong, K. P. (2019). An acoustic and lexical analysis of emotional valence in spontaneous speech: Autobiographical memory recall in older adults. Proceedings of Interspeech, 3287–3291.
Nazareth, D. S., Jansen, M.-P., Truong, K. P., Westerhof, G. J., & Heylen, D. K. J. (2019). MEMOA: Introducing the Multi-Modal Emotional Memories of Older Adults database. Proceedings of Affective Computing and Intelligent Interaction (ACII).
Dudzik, B., Jansen, M.-P., Burger, F., Kaptein, F., Broekens, J., Heylen, D. K. J., Hung, H., Neerincx, M. A., & Truong, K. P. (2019). Context in Human Emotion Perception for Automatic Affect Detection: A Survey of Audiovisual Databases. Proceedings of Affective Computing and Intelligent Interaction (ACII).
Dai, L., Broekens, J., & Truong, K. P. (2019). Real-time pain detection in facial expressions for health robotics. Proceedings of the Workshop PD & EMOPAIN.
Neidlinger, K., Willson, C., Truong, K. P., Hermens, H., & Evers, V. (2018). Nanogami: the microbiome expanded. Speak your truth. Listen to your gut. Proceedings of the 2018 ACM International Symposium on Wearable Computers (ISWC '18), 295–300.
Neidlinger, K., & Truong, K. P. (2018). Multisensory garments for optimal body-mind awareness in space travel. Proceedings of the 69th International Astronautical Congress (IAC).
Kim, J., Truong, K. P., & Evers, V. (2018). Automatic temporal ranking of children's engagement levels using multi-modal cues. Computer Speech & Language, 50, 16--39.
De Vries, R. A. J., Truong, K. P., Zaga, C., Li, J., & Evers, V. (2017). A word of advice: how to tailor motivational text messages based on behavior change theory to personality and gender. Personal and Ubiquitous Computing, 1–13.
Truong, K. P., & Reidsma, D. (Eds.). (2017). Proceedings of the 12th Summer Workshop on Multimodal Interfaces (eNTERFACE'16). CTIT.
Lee, M., Kim, J., Truong, K. P., Kort de, Y., Beute, F., & IJsselsteijn, W. (2017). Exploring moral conflicts in speech: multidisciplinary analysis of affect and stress. Proceedings of Affective Computing and Intelligent Interaction, 407–414.
Neidlinger, K., Truong, K. P., Telfair, C., Feijs, L., Dertien, E., & Evers, V. (2017). AWElectric: that gave me goosebumps, did you feel it too? Proceedings of the 11th International Conference on Tangible, Embedded, and Embodied Interaction (TEI'17), 315–324.
Trouvain, J., & Truong, K. P. (2017). Laughter. In S. Attardo (Ed.), The Routledge Handbook of Language and Humor (pp. 340–355). Routledge.
Zaga, C., De Vries, R. A. J., Li, J., Truong, K. P., & Evers, V. (2017). A simple nod of the head: the effect of minimal robot movements on children's perception of a low-anthropomorphic robot. Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems (CHI 2017).
Kim, J., Truong, K. P., Englebienne, G., & Evers, V. (2017). Learning spectro-temporal features with 3D CNNs for speech emotion recognition. Proceedings of Affective Computing and Intelligent Interaction, 383–388.
Kim, J., Englebienne, G., Truong, K. P., & Evers, V. (2017). Towards Speech Emotion Recognition in the wild using Aggregated Corpora and Deep Multi-Task Learning. Proceedings of Interspeech, 1113–1117.
Kim, J., Englebienne, G., Truong, K. P., & Evers, V. (2017). Deep temporal models using identity skip-connections for speech emotion recognition. Proceedings of ACM Multimedia, Accepted.
De Vries, R. A. J., Truong, K. P., Kwint, S., Drossaert, C. H. C., & Evers, V. (2016). Crowd-Designed Motivation: Motivational Messages for Exercise Adherence based on Behavior Change Theory. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI2016), 297–308.
De Vries, R. A. J., Truong, K. P., & Evers, V. (2016). Crowd-Designed Motivation: Combining Personality and the Transtheoretical Model. Proceedings of the 11th International Conference on Persuasive Technology (PERSUASIVE 2016), 41–52.
Eyben, F., Scherer, K. R., Schuller, B., Sundberg, J., André, E., Busso, C., Devillers, L., Epps, J., Laukka, P., Narayanan, S., & Truong, K. P. (2016). The Geneva Minimalistic Acoustic Parameter Set (GeMAPS) for Voice Research and Affective Computing. IEEE Transactions on Affective Computing, 7(2), 190–202.
Zaga, C., De Vries, R. A. J., Spenkelink, S., Truong, K. P., & Evers, V. (2016). Help-Giving Robot Behaviors in Child-Robot Games: Exploring Semantic Free Utterances. Proceedings of the 11th ACM/IEEE International Conference on Human-Robot Interaction (HRI 2016) *Best Late Breaking Report Award*, 541–542.
Bajones, M., Zaga, C., Truong, K. P., Zillich, M., & Vincze, M. (2016). On the road to long-term interaction between children and robots. Proceedings of the RO-MAN Workshop on Long-Term Child-Robot Interaction.
Kim, J., Truong, K. P., & Evers, V. (2016). Automatic detection of children's engagement using non-verbal features and ordinal learning. Proceedings of the 5th Workshop on Child Computer Interaction (WOCCI 2016).
Kim, J., & Truong, K. P. (2016). Automatic analysis of children's engagement using interactional network features. Proceedings of the 5th Workshop on Child Computer Interaction (WOCCI 2016).
Trouvain, J., & Truong, K. P. (2015). Prosodic characteristics of read speech before and after treadmill running. Proceedings of Interspeech, 3700–3703.
Truong, K. P., Nieuwenhuys, A., Beek, P., & Evers, V. (2015). A database for analysis of speech under physical stress: detection of exercise intensity while running and talking. Proceedings of Interspeech, 3705–3709.
Zaga, C., Lohse, M., Truong, K. P., & Evers, V. (2015). The effect of a robot's social character on children's task engagement: peer versus tutor. Proceedings of the 7th International Conference on Social Robotics (ICSR2015), 704–713.
Vroon, J., Joosse, M., Lohse, M., Kolkmeier, J., Kim, J., Truong, K. P., Englebienne, G., Heylen, D., & Evers, V. (2015). Dynamics of social positioning patterns in group-robot interactions: an inductive method. Proceedings of the 24th IEEE International Symposium on Robot and Human Interactive Communication (RO-MAN2015), 394–399.
Shiarlis, K., Messias, J., van Someren, M., Whiteson, S., Kim, J., Vroon, J. H., Englebienne, G., Truong, K. P., Evers, V., Perez-Higueras, N., Perez-Hurtado, I., Ramon-Vigo, R., Caballero, F., Merino, L., Shen, J., Petridis, S., Pantic, M., Hedmen, L., Scherlund, M., … Michel, H. (2015). TERESA: a socially intelligent semi-autonomous telepresence system. Proceedings of the Workshop on Machine Learning for Social Robotics.
Ligthart, M., & Truong, K. P. (2015). Selecting the right robot: influence of user attitude, robot sociability and embodiment on user preferences. Proceedings of the 24th IEEE International Symposium on Robot and Human Interactive Communication (RO-MAN2015), 682–687.
Kim, J., Truong, K. P., Charisi, V., Zaga, C., Lohse, M., Heylen, D., & Evers, V. (2015). Vocal turn-taking patterns in groups of children performing collaborative tasks: an exploratory study. Proceedings of Interspeech, 1645–1649.
Truong, K. P., Westerhof, G. J., Lamers, S. M. A., & de Jong, F. M. G. (2014). Towards modeling expressed emotions in oral history interviews: using verbal and nonverbal signals to track personal narratives. Literary and Linguistic Computing, 29(4), 621–636.
Lamers, S. M. A., Truong, K. P., Steunenberg, B., de Jong, F. M. G., & Westerhof, G. J. (2014). Applying prosodic speech features in mental health care: an exploratory study in life-review intervention for depression. Proceedings of the ACL Workshop on Computational Linguistics and Clinical Psychology: From Linguistic Signal to Clinical Reality, 61–68.
Truong, K. P., & Trouvain, J. (2014). Investigating prosodic relations between initiating and responding laughs. Proceedings of Interspeech, 1811–1815.
Zaga, C., Truong, K. P., Lohse, M., & Evers, V. (2014). Exploring child-robot engagement in a collaborative task. Proceedings of the IDC2014 Child-Robot Interaction Workshop - Social Bonding, Learning and Ethics.
Truong, K. P., Westerhof, G. J., de Jong, F. M. G., & Heylen, D. K. J. (2014). An annotation scheme for sighs in spontaneous dialogue. Proceedings of Interspeech, 228–232.
Truong, K. P., Westerhof, G. J., Lamers, S. M. A., & de Jong, F. M. G. (2013). Multidisciplinary analysis of oral history collections: emotions in narrative psychology and automatic human behaviour analysis. Proceedings of Digital Testimonies on War and Trauma.
Truong, K. P., Westerhof, G. J., Lamers, S. M. A., de Jong, F. M. G., & Sools, A. M. (2013). Emotion expression in oral history narratives: Comparing results of automated verbal and nonverbal analyses. Proceedings of Computational Models of Narrative, 310–314.
Trouvain, J., & Truong, K. P. (2013). Exploring sequences of speech and laughter activity using visualisations of conversations. Proceedings of the Workshop on Affective Social Speech Signals.
Poppe, R. W., Truong, K. P., & Heylen, D. K. J. (2013). Perceptual evaluation of backchannel strategies for artificial listeners. Autonomous Agents and Multi-Agent Systems, 27(2), 235–253.
Truong, K. P., & Trouvain, J. (2012). On the acoustics of overlapping laughter in conversational speech. Proceedings of Interspeech, 851–854.
Truong, K. P., & Trouvain, J. (2012). Laughter annotations in conversational speech corpora - possibilities and limitations for phonetic analysis. Proceedings of the LREC Workshop on Corpora for Research on Emotion Sentiment and Social Signals, 20–24.
Trouvain, J., & Truong, K. P. (2012). Convergence of laughter in conversational speech: effects of quantity, temporal alignment, and imitation. Proceedings of the International Symposium on Imitation and Convergence in Speech.
Truong, K. P., van Leeuwen, D. A., & de Jong, F. M. G. (2012). Speech-based recognition of self-reported and observed emotion in a dimensional space. Speech Communication, 54(9), 1049–1063.
Truong, K. P., & Heylen, D. K. J. (2012). Measuring prosodic alignment in cooperative task-based conversations. Proceedings of Interspeech, 843–846.
Trouvain, J., & Truong, K. P. (2012). Comparing non-verbal vocalisations in conversational speech corpora. Proceedings of the LREC Workshop on Corpora for Research on Emotion Sentiment and Social Signals, 36–39.
Trouvain, J., & Truong, K. P. (2012). Acoustic, morphological, and functional aspects of yeah/ja in Dutch, English, and German. Proceedings of the Interdisciplinary Workshop on Feedback Behaviors in Dialog.
Sun, X., Truong, K. P., Nijholt, A., & Pantic, M. (2011). Automatic anderstanding of affective and social signals by multimodal mimicry recognition. Proceedings of the 4th International Conference on Affective Computing and Intelligent Interaction (ACII), 6975, 289–296.
Sun, X., Nijholt, A., Truong, K. P., & Pantic, M. (2011). Automatic visual mimicry expression analysis in interpersonal interaction. IEEE Computer Vision and Pattern Recognition Workshops (CVPRW), 40–46.
Vinciarelli, A., Salamin, H., Mohammadi, G., & Truong, K. P. (2011). More than words: inference of socially relevant information from nonverbal vocal cues in speech. In A. M. Esposito, R. Martone, V. Muller, & G. Scarpetta (Eds.), Toward Autonomous, Adaptive, and Context-Aware Multimodal Interfaces. Theoretical and Practical Issues (Vol. 6456, pp. 23–33). Springer Verlag.
Sun, X., Truong, K. P., Pantic, M., & Nijholt, A. (2011). Towards visual and vocal mimicry recognition in human-human interactions. Proceedings of the IEEE International Conference on Systems, Man, and Cybernetics (IEEE SMC 2011): Special Session on Social Signal Processing, 367–373.
ter Maat, M., Truong, K. P., & Heylen, D. K. J. (2011). How agents' turn-taking strategies influence impressions and response behaviors. Presence: Teleoperators and Virtual Environments, 20(5), 412–430.
Poppe, R. W., Truong, K. P., & Heylen, D. K. J. (2011). Backchannels: quantity, type and timing matters. Proceedings of the International Conference on Intelligent Virtual Agents (IVA), 6895, 228–239.
Reidsma, D., de Kok, I. A., Neiberg, D., Pammi, S., van Straalen, B., Truong, K. P., & van Welbergen, H. (2011). Continuous interaction with a virtual human. Journal on Multimodal User Interfaces, 4(2), 97–118.
Truong, K. P., Poppe, R. W., de Kok, I. A., & Heylen, D. K. J. (2011). A multimodal analysis of vocal and visual backchannels in spontaneous dialogs. Proceedings of Interspeech, 2973–2976.
Neiberg, D., & Truong, K. P. (2011). Online detection of vocal listener responses with maximum latency constraints. Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 5836–5839.
Truong, K. P. (2010). Measuring affective and social signals in vocal interaction. Proceedings of Measuring Behavior.
op den Akker, H. J. A., Theune, M., Truong, K. P., & de Kok, I. A. (2010). The organisation of floor in meetings and the relation with speaker addressee patterns. Proceedings of the 2nd International Workshop on Social Signal Processing (SSPW), 35–40.
ter Maat, M., Truong, K. P., & Heylen, D. (2010). How turn-taking strategies influence users' impressions of an agent. Proceedings of the International Conference on Intelligent Virtual Agents (IVA), 441–453.
Reidsma, D., Truong, K. P., van Welbergen, H., Neiberg, D., Pammi, S., de Kok, I. A., & van Straalen, B. (2010). Continuous interaction with a virtual human. Proceedings of the 6th International Summer Workshop on Multimodal Interfaces (ENTERFACE'10), 24–39.
Poppe, R. W., Truong, K. P., Reidsma, D., & Heylen, D. K. J. (2010). Backchannel strategies for artificial listeners. Proceedings of the International Conference on Intelligent Virtual Agents (IVA), 6356, 146–158.
Jochems, B., Larson, M. A., Ordelman, R. J. F., Poppe, R. W., & Truong, K. P. (2010). Towards affective state modeling in narrative and conversational settings. Proceedings of Interspeech, 490–493.
Truong, K. P., Poppe, R. W., & Heylen, D. K. J. (2010). A rule-based backchannel prediction model using pitch and pause information. Proceedings of Interspeech, 3058–3061.
Salamin, H., Viciarelli, A., Truong, K. P., & Mohammadi, G. (2010). Automatic role recognition based on conversational and prosodic behaviour. Proceedings of the ACM International Conference on Multimedia, 847–850.
Neerincx, M. A., Cremers, A. H. M., Kessens, J. M., van Leeuwen, D. A., & Truong, K. P. (2009). Attuning speech-enabled interfaces to user and context for inclusive design: technology, methodology and practice. Universal Access in the Information Society, 8(2), 109–122.
Truong, K. P., van Leeuwen, D. A., Neerincx, M. A., & de Jong, F. M. G. (2009). Arousal and valence prediction in spontaneous emotional speech: felt versus perceived emotion. Proceedings of Interspeech, 2027–2030.
Strik, H., Truong, K., de Wet, F., & Cucchiarini, C. (2009). Comparing different approaches for automatic pronunciation error detection. Speech Communication, 51, 845–852.
Reuderink, B., Poel, M., Truong, K. P., Poppe, R. W., & Pantic, M. (2008). Decision-level fusion for audio-visual laughter detection. Proceedings of the 5th International Workshop on Machine Learning for Multimodal Interaction (MLMI), 5237, 137–148.
Truong, K. P., & Raaijmakers, S. (2008). Automatic recognition of spontaneous emotions in speech using acoustic and lexical features. Proceedings of the 5th International Workshop on Machine Learning for Multimodal Interaction (MLMI), 161–172.
Truong, K. P., Neerincx, M. A., & van Leeuwen, D. A. (2008). Measuring spontaneous vocal and facial emotion expressions in real world environments. Proceedings of Measuring Behavior.
Truong, K. P., Neerincx, M. A., & van Leeuwen, D. A. (2008). Assessing agreement of observer- and self-annotations in spontaneous multimodal emotion data. Proceedings of Interspeech, 318–321.
Raaijmakers, S., Truong, K., & Wilson, T. (2008). Multimodal subjectivity analysis of multiparty conversation. Proceedings of the 2008 Conference on Empirical Methods in Natural Language Processing, 466–474.
Grootjen, M., Neerincx, M. A., van Weert, J. C. M., & Truong, K. P. (2007). Measuring cognitive task load on a naval ship: implications of a real world environment. Proceedings of the 3rd International Conference on Foundations of Augmented Cognition, 147–156.
Truong, K. P., & van Leeuwen, D. A. (2007). An "open-set" detection evaluation methodology for automatic emotion recognition in speech. Proceedings of ParaLing'07: The International Workshop on Paralinguistic Speech, 5–10.
van Leeuwen, D. A., & Truong, K. P. (2007). An open-set detection evaluation methodology applied to language and emotion recognition. Proceedings of Interspeech, 338–341.
Truong, K. P., & van Leeuwen, D. A. (2007). Visualizing acoustic similarities between emotions in speech: an acoustic map of emotions. Proceedings of Interspeech, 2265–2268.
Truong, K. P., & van Leeuwen, D. A. (2007). Evaluating laughter segmentation in meetings with acoustic and acoustic-phonetic features. Proceedings of the Interdisciplinary Workshop on the Phonetics of Laughter, 49–53.
Truong, K. P., & van Leeuwen, D. A. (2007). Automatic discrimination between laughter and speech. Speech Communication, 49, 144–158.
Melder, W. A., Truong, K. P., Den Uyl, M., van Leeuwen, D. A., Neerincx, M. A., Loos, L. R., & Plum, B. S. (2007). Affective multimodal mirror: sensing and eliciting laughter. Proceedings of the International Workshop on Human-Centered Multimedia, 31–40.
Truong, K. P., van Leeuwen, D. A., & Neerincx, M. A. (2007). Unobtrusive multimodal emotion detection in adaptive interfaces: speech and facial expressions. Proceedings of the 3rd International Conference on Foundations of Augmented Cognition, 354–363.
Merkx, P. P. A. B., Truong, K. P., & Neerincx, M. A. (2007). Inducing and measuring emotion through a multiplayer first-person shooter computer game. Proceedings of the Computer Games Workshop.
Strik, H., Truong, K., de Wet, F., & Cucchiarini, C. (2007). Comparing classifiers for pronunciation error detection. Proceedings of Interspeech, 1837–1840.
Truong, K. P., & van Leeuwen, D. A. (2005). Automatic detection of laughter. Proceedings of Interspeech, 485–488.
Neri, A., Truong, K., & de Wet, F. (2005). An acoustic-phonetic approach to automatic error detection in non-native Dutch speech. Proceedings of the 1st ASA Workshop on Second Language Speech Learning.
Truong, K., Neri, A., de Wet, F., Cucchiarini, C., & Strik, H. (2005). Automatic detection of frequent pronunciation errors made by L2-learners. Proceedings of Interspeech, 1345–1348.
Truong, K., Neri, A., Cucchiarini, C., & Strik, H. (2004). Automatic pronunciation error detection: an acoustic-phonetic approach. Proceedings of the InSTIL/ICALL 2004 Symposium on Computer Assisted Learning.
Truong, K. P. (2004). Automatic pronunciation error detecion in Dutch as a second language: an acoustic-phonetic approach [Master thesis, Radboud University Nijmegen/Utrecht University].