• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.470-472
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• 2000

본 논문은 Layered Transmission(LT)기법의 단점인 세밀하지 못한(coarse-grained) QoS 확장성을 보완하기 위해서 계층 단위로 세션을 떠나기 이전에 각 계층 내에서 프레임을 생략하는 기법을 제안한다. 이 기법은 기존의 LT 기법보다 네트워크 상태 변화에 따라서 좀 더 세밀한 QoS 확장성을 제공해 준다. 따라서 네트워크 대역폭의 활용도를 최대화하고 패킷 손실을 최소화할 수 있다. 또 사용 가능한 네트워크 대역폭을 최대한 활용함으로써 사용자들에게 최적의 서비스를 제공해 준다.

• Journal of the HCI Society of Korea
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• v.7 no.2
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• pp.43-48
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• 2012

Usability assessment has been installed into a wide range of software that focuses on assessing product usage from the user's perspective. Usability assessment of the quality of life technology for individuals with disability is being discussed and tentatively designed which is also expanded to the products for non-disabled people with minor adjustment of the usability assessment protocol. Designing an appropriate usability assessment protocol by referencing the currently available international standards on software usability tests with number of modifications to produce valuable feedbacks is under evaluation process regarding product usability enhancement. The feasibility study on usability assessment protocol into quality of life technologies is presented with discussions on further research.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.7
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• pp.153-161
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• 2015

In the present study, as part of the technology development (Quality of Life Technology, QoLT) to improve the socio-economic status of people with disabilities as an extension of these studies, we propose the development of the smart wheelchair system and navigation technology for stable and safe driving in various environments. For the disabled and the elderly make driving easy and convenient with manual/autonomous driving condition, we firstly develop the user-oriented smart wheelchair system with optimized sensors for environment recognition, and then we propose a navigation framework of a hierarchical structure to ensure real-time response, as well as driving stability when traveling to various environmental changes, and to enable a more efficient operation. From the result of several independent experiments, we ensure efficiency and safety of smart wheelchair and its navigation system.

• Journal of Digital Convergence
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• v.15 no.2
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• pp.155-163
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• 2017

South Korea has experienced various social problems during rapid economic development, and now attempts to address them through social economy and advanced technologies. This approach, however, requires comprehensive research on not only phenomenal issues but also their fundamental causes and regional/cultural contexts as Design Thinking Process does. This study aims to draw implications for applying Design Thinking Process into the entire process of solving social problems, from field research, idea refinement, and solution design. Limitations of Design Thinking-based social problem solving are also drawn through comparative analysis on various cases. In conclusion, the process of refining ideas and developing product/service can be utilized by social enterprises, ventures, NGOs, etc. as a guideline in addressing social problems.

• Phonetics and Speech Sciences
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• v.13 no.2
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• pp.45-55
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• 2021

This study aims to analyze the acoustic characteristics of Korean affricates produced by dysarthric speakers with cerebral palsy. Korean fricatives and affricates are the consonants that are prone to errors in dysarthric speech, but previous studies have focused only on fricatives. For this study, three affricates /tɕ, tɕ^h, ͈tɕ/ appearing at word initial and intervocalic positions produced by six mild-moderate male speakers of spastic dysarthria are selected from a QOLT database constructed in 2014. The parameters representing the acoustic characteristics of Korean affricates were extracted by using Praat: frication duration, closure duration, center of gravity, variance, skewness, kurtosis, and central moment. The results are as follows: 1) frication duration of the intervocalic affricates produced by dysarthric speakers was significantly longer than that of the non-disordered speakers; 2) the closure duration of dysarthric speakers was significantly longer; 3) in the case of the center of gravity, there was no significant difference between the two groups; 4) the skewness of the dysarthric speakers was significantly larger; and 5) the central moment of dysarthric speakers was significantly larger. This study investigated the characteristics of the affricates produced by dysarthric speakers and differences with non-disordered speakers.