• 한국노년학
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• v.39 no.4
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• pp.921-939
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• 2019

According to the social selectivity theory (SST), despite the disadvantages of life conditions, older adults experience less negative emotions because they regulate their emotions by avoiding negative stimuli or situations. Based on the SST, this study attempted to find out whether older adults are better able to regulate negative emotions than young adults in the Ultimatum Game (UG). In an UG, if the proposer proposes to distribute a portion of the money to the responder, the responder must decide whether to accept or reject it. If the responder accepts the offer, the proposer and the responder can each have their own share as proposed, but if s/he reject the offer, both get nothing. Thus, if the responder considers own economic benefits, it is a more reasonable decision to accept the unfair offer no matter how low, than to reject it. To accept an unfair offer, the responder must regulate the anger felt at the proposer. If older adults could regulate anger better than young adults, they would be less likely to reject the unfair offer than young adults. Fifty-seven olders and 60 university students participated in this study. Both the older and young adults accepted most of the fair offers. In contrast, older adults accepted unfair offers at a significantly higher rate than young adults. In addition, compared to young adults, older adults reported anger less frequently at the unfair offers. Accepting unfair offers was negatively correlated with anger report, but positively correlated with the emotion regulation measured by ERQ. The ERQ score was negatively correlated with anger report. Emotion regulation partially mediated the relationship between the age groups and acceptance of unfair offers. The present results showed that older adults accepted the unfair offers at a higher rate than young adults because they could regulate the negative emotions felt at the unfair offer better than young adults. This study provided new evidence for the claim that improving emotional regulation is a major developmental change in adulthood.

• Journal of Internet Computing and Services
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• v.6 no.3
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• pp.121-128
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• 2005

Recently, as the research of effective resource management for supporting of various next generation internet service, the admission control mechanisms using the dynamic provisioning methods in differentiated service networks are studied. However, even though admission control mechanism is applied to the network, there exits the unfairness of call blocking probability among the different bandwidth requested services. In this paper, we propose the new admission control policy heuristic algorithm that provides fairness of call blocking probability between the large bandwidth requested service and the small bandwidth requested service. The simulation results show that the proposed algorithm provides not only blocking probability fairness but also high bandwidth utilization.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.9
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• pp.849-858
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• 2012

We proposed a scheme to accurately detect elephant flows. Along the ever increasing traffic trend, certain flows occupy the network heavily in terms of time and network bandwidth. These flows are called elephant flows. Elephant flows raises complicated issues to manage for Internet traffics and services. One of the methods to identify elephant flows is the Landmark LRU cache scheme, which improved the previous method of Least Recently Used scheme. We proposed a cache update algorithm, to further improve the existing Landmark LRU. The proposed scheme improves the accuracy to detect elephant flow while maintaining efficiency of Landmark LRU. We verified our algorithm by simulating on Sangmyung University's wireless real network traces and evaluated the improvement.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.10
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• pp.27-35
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• 2010

In wireless packet networks, energy and wireless resource efficiency is critical issue to addressed for wide deployment. To achieve the both goals of saving the mobile station's energy and increasing the wireless capacity, transmission power control is introduced to wireless packet networks. In the transmission power controled networks, it is not deeply studied on unfairness among transmissions with different power levels that reaches starvation. Through the performance analysis, this paper explains the throughput unfairness of high power transmission with the unfair media access probability owing to the contending node number difference and proposes a simple PHY-MAC cross layer approach.

• The KIPS Transactions:PartC
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• v.12C no.2 s.98
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• pp.217-222
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• 2005

The IEEE 802.11 based wireless local area networks are candidates to lead the broadband connectivity in the home and office scenarios. Recently IEEE proposed the 802.11e as a new standard to provide appropriate Quality of Services to a plethora of emerging real-time multimedia and high demanding applications such as high definition movie and audio distribution, video-conference and voice over IP. This paper studies the IEEE 802.11e/IEEE 802.11b interactions focusing on potential unfairness problems that might appear in networks with heterogeneous wireless LAN technologies as well as in the IEEE 802.11e deployment phase.

• 비료회보
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• s.546
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• pp.16-25
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• 2003

2002년 중국이 상당히 증가된 분량의 비료를 수입하기로 한 약속을 취소할 것처럼 보였을 때, 세계무역기구(WTO)의 중국 가입을 돕기 위해 미국 의회에서 매우 열심히 로비를 해 온 Fertilizer Institute(TFI)는 실망을 감출 수 없었다. 불공평하다, 중국은 이렇게 대답했다 : 중국의 비료 수요는 무한하지 않고 우리는 시장을 늪에 빠져서는 안 된다. 그런데 미국은 더 심한 충격을 주었다 : 수입 비료의 금속함유량에 대한 새로운 규정은 세계의 어느 지역에서 제안된 것보다 엄격하다. 이러한 규정은 향후의 미국 비료 수출에 상당한 위협을 줄 것이다. 의지의 본격적인 전쟁에 대비한 방법은 분명한 것처럼 보였다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.307-309
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• 2002

멀티캐스트는 네트워크 대역폭을 효율적으로 사용하기 위한 방법으로써, 한번의 전송으로 동일한 데이터의 수신을 원하는 여러 수신자들이 동시에 받을 수 있도록 해줌으로써, 동일한 데이터를 여러 번 전송함으로써 발생하는 대역폭의 낭비를 줄인다. 그와는 달리 혼잡 제어 기술은 어떻게 대역폭을 여러 사람들이 공평하게 나누어 사용할 것이며, 대역폭의 이용률을 최대화할 것인가를 주된 연구 대상으로 한다. 특히, 혼잡 제어 기술은 인터넷에서 더욱 중요한 부분으로 혼잡 제어 메커니즘이 적용되어 있지 않은 플로우는 네트워크 사용의 불공평성과 혼잡으로 인한 네트워크 동작 중단(congestion collapse)을 초래한다〔1〕.따라서 새로운 프로토콜을 제안하는 데 있어서 핵심 기능 중 하나는 효율적인 혼잡 제어 메커니즘의 유무이며, 그 혼잡 제어 기법이 인터넷 트래픽의 대부분을 차지하고 있는 TCP와 공평하게 대역폭을 나누어서 사용할 수 있는가가 프로토콜 평가의 중요한 기준중 하나이다. 본 연구에서는 기존의 일대다 신뢰적 멀티캐스트를 위한 혼잡제어 기법들의 비교 분석을 통하여, 각각의 특성을 밝히며, 각 기법들의 특징을 비교함으로써 다대다 멀티케스트 혼잡 제어를 위한 가장 적합한 방법을 알아본다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.45 no.2
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• pp.55-60
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• 2008

Packet-switched wavelength division multiplexing (WDM) ring networks have been extensively studied as solutions to the increasing amount of traffic in metropolitan area networks, which is widely expected to be a mix of unicast and multicast traffic. In this paper we study the fairness between unicasting and multicasting in slotted packet-switched WDM ring networks that employ a tunable transmitter and fixed tuned receiver at each node and a posteriori buffer selection. We find that single-step longest queue selection algorithm generally results in unfairness between unicasting and multicasting or a lilted relative priority for multicast vs. unicast traffic. We present the various virtual output queue structures and their performance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.3A
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• pp.230-236
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• 2007

This paper presents a resource management mechanism for the mesh networking in IEEE 802.15.3 High-rate WPAN. IEEE 802.15 TGS is standardizing the MAC and PHY for mese networking. This task group researches the mechanism that are extension of network coverage without increasing transmit power of receive sensitivity, and studies the enhanced reliability via route redundancy. In this paper we propose the distributed resource management scheme that is fairly using the channel resource in the piconet without centralized piconet coordinator. Each DEV reserves the channel time and broadcasts its information. This scheme has unfairness for later associated DEV because of preoccupation of earlier associated DEVs. This paper presents the method that fairly allocates the channel time in MAC layer. And we evaluate the performance enhancement using simple simulations.