• Journal of the Korea Society of Computer and Information
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• v.7 no.2
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• pp.115-123
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• 2002

This thesis proposes a new type of Input-Output Buffered ATM Switch which employs an arbiter and its performance under different traffic conditions studied. The proposed switch is designed with a view to exploit the architecture and other characteristics of the arbiter. The primary aim of the proposed switch is the elimination, or at least, the reduction of HOL blocking phenomenon which occurs in the simple input buffered switch. Several HOL arbitration algorithms have been proposed for this purpose in the literature. The proposed switch attempts to reduce the HOL blocking as it uses the arbiter and the buffer at the output port in an effective manner. The arbiter is designed to work with Three Phase Algorithm which is one of the many well known HOL arbitration algorithms. The Proposed switch acquires control over priority transmission through the REQ signal. As the signals are transmitted to the arbiter, the latter controls the one which is sent by the input buffer. Computer simulation results have been provided to demonstrate the effectiveness of the Proposed switch under uniform traffic conditions.

• Journal of the Korea Society of Computer and Information
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• v.8 no.2
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• pp.97-105
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• 2003

This thesis proposes a new type of Input-Output Buffered ATM Switch which employs an arbiter and its performance under different traffic conditions studied. The proposed switch is designed with a view to exploit the architecture and other characteristics of the arbiter The primary aim of the proposed switch is the elimination, or at least, the reduction of HOL blocking phenomenon which occurs in the simple input buffered switch. Several HOL arbitration algorithms have been proposed for this purpose in the literature. The Proposed switch attempts to reduce the HOL blocking as it uses the arbiter and the buffer at the output Port in an effective manner. The arbiter is designed to work with Three Phase Algorithm which is one of the many well known HOL arbitration algorithms . The proposed switch acquires control over priority transmission through the REd signal. As the signals are transmitted to the arbiter, the latter controls the one which is sent by the input buffer. Computer simulation results have been provided to demonstrate the effectiveness of the proposed switch under non-uniform random traffic conditions.

• Journal of Arbitration Studies
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• v.18 no.1
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• pp.147-165
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• 2008

Appointment of arbitrators is very important in arbitration. As it has been a long laps since Korean peninsula was devided into two parts, South and North, it has come to be too much gaps between South and North in the law, social system, commercial practice and etc.. South Korea is familar to international commercial practice and capitalistic legal system generalized internationally in modern times. On the other hand as North Korea was closed society for a long time, they are not familar to international commercial practice and market economy. In this connection, commercial disputes arising from the transactions between South and North will occur frequently and it will be very difficult to select governing law or commercial practice referred to the disputes. Under the circumstances, when and if an arbitrator from South or North will be appointed as presiding arbitrator in the tribunal composed by three arbitrators, the part from which the presiding arbitrator come will be a majority, and it will be advantageous to the parties came from the part of which the presiding arbitrator come from. Such being the case, sole arbitrator or presiding arbitrator needs to be appointed among foreigner. Otherwise I recommend the tribunal composed by two arbitrators and umpire system. As to arbitrator's fee, as there is a big gap in its economic aspects between South and North, I supposed to need establishing the fund made by corporation with South and North in order to compensate arbitrators from South or abroad for their fee. Finally it is more important to prevent disputes arising from transactions between South and North. In order to prevent the disputes, education for North Korean about international commercial practice and skill to make a contract of international sale of goods and investment are needed.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.5
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• pp.78-87
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• 2009

In the IEEE 802.16 Wireless MAN standard, the best effort service class is ranked on the lowest position in priority and is assisted by a MAC scheme based on reservation ALOHA. In such a MAC scheme, a collision among the requests is unavoidable so that the standard adopted a binary exponential back-off rule to arbitrate a collision. Aiming at improving throughput performance, we present two generic collision arbitration rules based on p-persistence rule, (identified as pristine and metamorphosed rules), as alternatives in a wireless MAN. For each of these rules, we then develop an analytical method to calculate an approximate value of saturated throughput. In comparison with simulation results, we confirm the high accuracy of the analytical method. Also, the pristine and metamorphosed rules are observed to exhibit higher saturated throughput compared with the binary exponential back-off rule.

• The Journal of the Korea Contents Association
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• v.17 no.2
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• pp.623-636
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• 2017

The use of virtual reality(VR)-based interventions for students with autism spectrum disorders(ASD) has received special attention as evidence-based practices for its feasiblity, practicality, and appropriateness. However, there is little research to investigate the effects of VR-based intervention for students with ASD in Korea. This study identifies and reviews studies applying VR-based interventions. In total, 13 experimental studies were found that examine the effects of VR interventions published from 1990 to 2016. The selected studies were analyzed by 6 variables including publication year, participants, research design, independent variable, dependent variable, and outcome. The results of this study showed the feasibility of the implementing VR-based interventions in various age group students with ASD. In addition, the utilization of VR techniques was particularly effective in improving a wide range of social communication skills including facial recognition, empathy, joint attention, understanding social context, and resolving issues due to limited cognitive abilities. Several recommendations for the future study on VR-based intervention for students with ASD such as interdisciplinary approach to VR-based interventions, support needs regarding characteristics of ASD, generalization and maintenance of acquired technology, and consideration for participants' cultural background. were discussed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.1A
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• pp.122-131
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• 2000

In this paper, we propose a cell scheduling algorithm for input queueing ATM switch. The input queueing architecture is attractive for building an ultra-high speed ATM (Asynchronous Transfer Mode) switch. We proposea WMUCS (Weighted Matrix Unit Cell Scheduler) based on the MUCS which resolves HOL blocking and outputport contention. The MUCS algorithm selects an optimal set of entries as winning cells from traffic matrix (weightmatrix). Our WMUCS differs from the MUCS in generating weight matrices. This change solves the starvationproblem and it reduces the cell loss variance. The performance of the proposed algorithm is evaluated by thesimulation program written in C++. The simulation results show that the maximum throughput, the average celldelay, and the cell loss rate are significantly improved. We can see that the performance of WMUCS is excellentand the cost-effective implementation of the ATM switch using proposed cell scheduling algorithm.

• The Journal of the Korea Contents Association
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• v.16 no.9
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• pp.590-599
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• 2016

This study aims to examine the effect of adolescents' life stress and smartphone use on academic impairment and to investigate the impact of parents involvement on smatphone use. Online survey are performed among Korean adolescents from 13 to 18 years old. The results show that entertainment use of smartphone and high level of smartphone addiction are significant predictors of adolescent academic impairment. In addition, significant relationships were found between academic impairment and the dimensions of life stress, such as family conflict, academic, and pressure on the future. With respect to the impact of parent involement on academic impairment and smartphone use, time limit has the positive relationship with entertainment use of smartphone, while restriction on the specific smartphone application use has the negative relationship with information use of smartphone.

• Journal of Korea Entertainment Industry Association
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• v.15 no.7
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• pp.45-57
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• 2021

The purpose of this study is to identify what factors have impacts on the amount of YouTube viewing. In doing so, usage type, children's levels of self-control on viewing, parent's perception of media contents, and parental mediation style were investigated by age. The result of the study showed no significant differences of the amount of use by the different age groups. There were, however, significant differences in terms of subscription status(non subscription based vs. subscription-based viewing), level of self-control, perception of content, and parent's mediations (technology, supervision, and guidance). Given the amount of YouTube use, the subscription status and parent's supervision were significantly influential factors for the age group of 3-4 years old. For the age group of 5-6, subscription status, levels of self-control, and mediation of parent's supervision and guidance were influential factors. For the age of 7-9, subscription status, the level of self control, and premium service were significantly influential. Finding similarities and differences in meaningful variables by age group suggests that different strategies should be used to reduce the amount of children's YouTube use. In addition, it raises the need for a more detailed classification of children's YouTube usage methods, which have not been addressed so far, and the need for research on the influence of these methods.

• KIPS Transactions on Software and Data Engineering
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• v.5 no.8
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• pp.351-360
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• 2016

Sensors equipped in Internet-of-Thing (IoT) devices are used to measure the surrounding contexts, and IoT applications analyze the contexts to infer situations and provide situation-specific smart services. There are different context acquisition schemes including pulling, pushing, and broadcasting. Most IoT devices support only one of the schemes. Hence, there can be an incompatible issue on data acquisition schemes between applications and devices, and consequently it could result in an increased development cost and inefficiency on application maintenance. This paper presents design patterns which can effectively remedy the incompatibility problem. By applying the patterns, IoT applications with incompatibility can be systematically and effectively developed. And, also its maintainability is expected to increase.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.502-504
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• 2002

JavaSpace는 쉽고 단일화된 방식으로 분산 어플리케이션간의 객체공유, 중재 및 동적인 통신서비스를 제공한다. 현재 Javaspace글 이용한 응용 프로그램들이 계속적으로 등장하고 있다. 기존의 JavaSpace는 중앙 집중적인 클라이언트/서버 방식으로 구현되었기 때문에 성능이 제한적이다. 본 논문에서는 그룹 참여자들간의 상태를 일관성 있게 유지시켜주는 그룹통신 시스템을 이용하여 분할가능한 분산환경에 적합한 복제된 Javaspace 시스템을 설계하였다. 복제된 JavaSpace 시스템을 이용하는 웅용 프로그램들은 효율성과 확장성을 증대시킬 수 있다.