• Journal of Digital Convergence
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• v.11 no.10
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• pp.123-131
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• 2013

This study aims to investigate development directions for smart contents to support enhancing adaptive behavior skills of children with autistic disorder in elementary school. AHP survey of experts including special education teachers and directors in educational institution for disability children was performed to analyze importance weight for smart contents development necessity and effectiveness in adaptive behavior skills. And the smart contents development suitability through pre-discussion for idea generation for various development method and AHP survey with smart application development experts was evaluated. The results show that the effective and suitable adaptive behavior skills for smart contents development were understanding of languaging, time management and keeping, movement skills, wearing clothes, and personal hygiene in order of importance. Based on this study, education authorities should make an effort not to develop fragmentary educational smart contents but to support development of smart contents and service systems with better effectiveness and usability to meet demand for special education teachers and parents considering characteristics of children with autism.

• Journal of KIISE:Information Networking
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• v.30 no.3
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• pp.316-328
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• 2003

In this paper, we propose and analyze two adaptive channel allocation schemes for supporting multimedia traffics in hierarchical cellular systems. It is guaranteed to satisfy the required quality of service of multimedia traffics according to their characteristics such as a mobile velocity for voice calls and a delay tolerance for multimedia calls. In the scheme 1, only slow-speed voice calls are allowed to overflow from macrocell to microcell and only adaptive multimedia calls can overflow from microcell to macrocell after reducing its bandwidth to the minimum channel bandwidth. In the scheme II, in addition to the first scheme, non-adaptive multimedia calls can occupy the required channel bandwidth through reducing the channel bandwidth of adaptive multimedia calls. The proposed scheme I is analyzed using 2-dimensional Markov model. Through computer simulations, the analysis model and the proposed schemes are compared with the fixed system and two previous studies. In the simulation result, it is shown that the proposed schemes yield a significant improvement in terms of the forced termination probability of handoff calls and the efficiency of channel usage.

• Journal of KIISE
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• v.42 no.8
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• pp.1039-1048
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• 2015

Recently, the web-based adaptive streaming service, DASH (Dynamic Adaptive Streaming over HTTP), is receiving more attention. However, existing network-based and buffer-based video quality control schemes in DASH environments make oscillation of segment throughput, causing degradation of the quality of experience (QoE) with frequent quality changes and playback interruptions because these schemes do not consider the content characteristics. In this paper, we propose a C-DASH (Content Characteristics based Dynamic Adaptive Streaming over HTTP) scheme in order to improve the QoE in DASH environments. The C-DASH scheme performs seamless and smooth quality control based on the segment throughput, buffer status, and segment size of the content. Based on simulation results, it is confirmed that the C-DASH scheme can improve the QoE, when compared with the existing quality control schemes.

• ETRI Journal
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• v.40 no.3
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• pp.318-329
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• 2018

Femtocell (FC) technology envisaged as a cost-effective approach to attain better indoor coverage of mobile voice and data service. Deployment of FCs over macrocell forms a heterogeneous network. In urban areas, the key factor limits the successful deployment of FCs is inter-cell interference (ICI), which severely affects the performance of victim users. Autonomous FC transmission power setting is one straightforward way for coordinating ICI in the downlink. Application of intelligent control using soft computing techniques has not yet explored well for wireless networks. In this work, autonomous FC transmission power setting strategy using Adaptive Neuro Fuzzy Inference System is proposed. The main advantage of the proposed method is zero signaling overhead, reduced computational complexity and bare minimum delay in performing power setting of FC base station because only the periodic channel measurement reports fed back by the user equipment are needed. System level simulation results validate the effectiveness of the proposed method by providing much better throughput, even under high interference activation scenario and cell edge users can be prevented from going outage.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.21-25
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• 2006

As the mobile computing technologies rapidly develops, the mobile phones are evolving into smart phones capable of higher performance. However, it is inevitable that the mobile phones have limited input/output functions in order to maintain the current portability. Because of the limited input and output, the mobile user interfaces currently adopt the inefficient structures based on sequential search and selection. In this paper, an intelligent and adaptive user interface techniques are proposed in order to surmount the current inefficiency of the static interface and to maximize the user convenience. The proposed techniques, based on the users' previous tasks, automatically generate an intelligent and adaptive user interface in order to make users efficiently utilize the mobile services.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.75-79
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• 2006

In a VoIP(Voice over IP) system which support the realtime speech service, speech quality is deteriorated by the delay, the jitter, the loss, and the reversed packet order. In this thesis, APBC for receiver site is proposed, which compensate the jitter by the adaptive playout algorithm and conceal the packet loss, and align the packet order. Also, a VoIP application system is implemented, and the performance of APBC is verified on the implemented system by measuring the processing speed and the speech quality. From the result, processing speed is 257$\mu$sec, which is fast enough to deal with packet being received in realtime. Also, the speech quality by MOS(Mean Opinion Score) is improved as 18 percent compared with algorithm of fixed playout delay.

• Korean Journal of Child Studies
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• v.32 no.4
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• pp.185-202
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• 2011

The purpose of this study was to examine the effects of the Seesaw & Swing Early Intervention Program on the positive changes of young children from low-income families. The Seesaw & Swing program was developed by the Community Chest of Korea (Hwang et al., 2009). The subjects for this study consisted of 534 3~6-year olds (177 in the service group, 357 in the control group) from low-income families. The instrument used was the Vineland Adaptive Behavior Scales, second edition (Sparrow, Cicchetti, & Balla, 2005). The results of this study indicated that the Seesaw & Swing intervention program produced positive effects in all of the domain areas under examination : namely, the communication abilities, life skills, socialization, physical development, and adaptive behaviors of young children. In conclusion, the Seesaw & Swing Early Intervention Program for young children from low-income families can be said to be an effective early intervention program which goes some way towards ending the intergenerational transition of poverty in Korea.

• ETRI Journal
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• v.30 no.2
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• pp.227-237
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• 2008

In this paper, an algorithm that provides absolute and proportional differentiation of packet delays is proposed with the objective of enhancing quality of service in future packet networks. It features an adaptive scheme that adjusts the target delay for every time slot to compensate the deviation from the target delay, which is caused by prediction error on the traffic to arrive at the next time slot. It predicts the traffic to arrive at the beginning of a time slot and measures the actual arrived traffic at the end of the time slot. The difference between them is utilized by the delay control operation for the next time slot to offset it. Because the proposed algorithm compensates the prediction error continuously, it shows superior adaptability to bursty traffic and exponential traffic. Through simulations we demonstrate that the algorithm meets the quantitative delay bounds and is robust to traffic fluctuation in comparison with the conventional non-adaptive mechanism. The algorithm is implemented with VHDL on a Xilinx Spartan XC3S1500 FPGA, and the performance is verified under the test board based on the XPC860P CPU.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.6
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• pp.1229-1234
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• 2012

In this paper, we analyze the problems that the DDS middleware, which is a standard data-centric communication interface, uses the fixed packet transmission method by the pre-defined protocol for exchanging data packets. The packet transmission method selected in a fixed manner cannot handle appropriately the increasing of resource overhead in an environment where the load of the DDS network changes dynamically. If the load on the node and network exceeds the threshold, the performance of the packet transmission may be degraded rapidly. This results in a failure of ensuring the real-time characteristic of DDS middleware. To solve this problem, we propose the scheme of the adaptive packet transmission for adjusting the transmission method in real-time based on the overhead on the DDS network.

• KIISE Transactions on Computing Practices
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• v.20 no.11
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• pp.592-597
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• 2014

In this paper, we propose an adaptive transformation engine that provides smart devices with optimal user interfaces and media contents to their characteristics so as to conveniently control home networks remotely using smart devices in the wired and wireless home networks which various kinds of smart devices and home network devices are connected. The proposed engine dynamically transforms UI contents and transfers them using device profiles and UI transformation policies to make it suitable for smart devices. Moreover, the proposed engine offers suitable media contents for smart devices through capabilities of real-time media transcoding and streaming considering device and media profiles.