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DSS: Distributed SINR-Based Scheduling Algorithm for Multihop Wireless Networks
Jiho Ryu,Changhee Joo,Kwon, Ted Taekyoung,Shroff, Ness B.,Yanghee Choi IEEE 2013 IEEE transactions on mobile computing Vol.12 No.6
<P>The problem of developing distributed scheduling algorithms for high throughput in multihop wireless networks has been extensively studied in recent years. The design of a distributed low-complexity scheduling algorithm becomes even more challenging when taking into account a physical interference model, which requires the SINR at a receiver to be checked when making scheduling decisions. To do so, we need to check whether a transmission failure is caused by interference due to simultaneous transmissions from distant nodes. In this paper, we propose a scheduling algorithm under a physical interference model, which is amenable to distributed implementation with 802.11 CSMA technologies. The proposed scheduling algorithm is shown to achieve throughput optimality. We present two variations of the algorithm to enhance the delay performance and to reduce the control overhead, respectively, while retaining throughput optimality.</P>
Jiho Ryu,Chang-Gun Lee,Kwon, T.T.,Junghee Han IEEE 2009 IEEE SENSORS JOURNAL Vol.9 No.10
<P>Wireless sensor networks have great potentials to be applied to mission critical real-time applications such as target tracking, emergency detection, and disaster management. For such real-time applications, sensory data should be delivered within the end-to-end deadlines; otherwise, the data may become useless or misleading. In order to provide such deterministic guarantee of end-to-end deadlines, not only packet scheduling within a single hop but also routing across multiple hops have to be jointly considered. In this paper, we propose a combined scheduling and routing mechanism that provides a deterministic guarantee of end-to-end deadlines leveraging real-time scheduling and analysis techniques. Our experimental study shows that the proposed mechanism can accommodate a larger workload meeting all the end-to-end deadlines than a pretty comprehensive set of other possible solutions of scheduling and routing that are known to deterministically guarantee end-to-end deadlines.</P>
Ji Ho Ryu,Jonu Pradhan,Dhiraj Maskey,Myeung Ju Kim 대한체질인류학회 2021 대한체질인류학회 학술대회 연제 초록 Vol.64 No.-
The term “circling mouse” refers to an animal model of deafness, in which the mouse exhibits circling, head tossing, and hyperactivity, with pathological features including degenerated spiral ganglion cells in the cochlea, and the loss of the organ of Corti. The cochlear nuclear (CN) complex, a part of the auditory brain circuit, is essential to process both ascending and descending auditory information. Considering calcium’s (Ca<sup>2+</sup>) importance in homeostasis of numerous biological processes, hearing loss by cochlear damage, either by ablation or genetic defect, could cause changes in the Ca<sup>2+</sup> concentration that might trigger functional and structural alterations in the auditory circuit. However, little is known about the correlation of the central nervous system pathology in circling mice, especially of the auditory pathway circuit and Ca<sup>2+</sup> changes. This present study investigates the distribution of Ca<sup>2+</sup>-binding proteins (CaBPs), calbindin D-28k (CB), parvalbumin (PV), and calretinin (CR) by using a free floating immunohistochemical method in the CN of the wild-type mouse (+/+), the heterozygous mouse (+/cir), and the homozygous (cir/cir) mouse. CaBPs are well known to be an important factor that regulates Ca<sup>2+</sup> concentrations. Compared with the dorsal and ventral cochlear nuclei of +/+ and +/cir mice, prominent decreases of CaBPs’ immunoreactivity (IR) in cir/cir mice were observed in the soma, as well as in the neuropil. The present study reportson the overall distribution and changes in the IR of CaBPs in the CN of cir/cir mice because of a hearing defect. This data might be helpful to morphologically elucidate central nervous system disorders and their relation to CaBPs IR related to hearing defects.
( Jiho Ryu ),( Hyun Jae Lee ),( Su Hyun Park ),( Asaduzzaman Sikder ),( Ju Ock Kim ),( Jang Hee Hong ),( Jeong Ho Seok ),( Choong Jae Lee ) 대한결핵 및 호흡기학회 2013 Tuberculosis and Respiratory Diseases Vol.75 No.5
Background: We investigated whether prunetin significantly affects tumor necrosis factor-α (TNF-α)-induced MUC5AC mucin gene expression, production, inhibitory kappa B (IkB) degradation and nuclear factor kappa B (NF-kB) p65 translocation in human airway epithelial cells. Methods: Confluent NCI-H292 cells were pretreated with prunetin for 30 minutes and then stimulated with TNF-α for 24 hours or the indicated periods. MUC5AC mucin gene expression and mucin protein production were measured by reverse transcription polymerase chain reaction and enzyme-linked immunosorbent assay, respectively. The effect of prunetin on TNF-α-induced degradation of IkB and translocation of NF-κB p65 was investigated by western blot analysis. Results: We found that incubation of NCI-H292 cells with prunetin significantly inhibited mucin production and down-regulated the MUC5AC gene expression induced by TNF-α. Prunetin inhibited TNF-α-induced degradation of IkB and translocation of NF-κB p65. Conclusion: This result suggests that prunetin inhibits the NF-κB signaling pathway, which may explain its role in the inhibition of MUC5AC mucin gene expression and production regulated by the NF-κB signaling pathway.
Ji Ho Ryu 한국호텔외식관광경영학회 2010 호텔경영학연구 Vol.19 No.5
It has long been discussed that organization citizenship behavior promotes the effective functioning of the organization, thus increasing shareholder value of a company. This research aims to reveal the antecedents of organization citizenship behavior and causal relationships among the concepts. Based on the literature review, this study found three key antecedents of organization citizenship behavior (LMX, cooperation, and empowerment) and moderating function of a gender. Accordingly, the purpose of this study was to examine the structural relationships among LMX, cooperation, empowerment, and OCB with the moderating role of gender. The proposed model was tested using the data collected from 178 hotel employees. According to structural equation modeling analysis, it was revealed that LMX directly/indirectly influences organization citizenship behavior via cooperation and empowerment. Also, moderating role of empowerment in the relationship between LMX and empowerment was revealed. More importantly, a moderating function of gender was found, indicating differential effect of LMX on empowerment and organization citizenship behavior. Based on data analysis, theoretical/empirical implications were discussed.
A Transparent Failover Mechanism for a Mobile Network with Multiple Mobile Routers
Nakjung Choi,JihoRyu,Eunkyoung Paik,Taekyoung Kwon,Yanghee Choi IEEE 2007 IEEE communications letters Vol.11 No.7
<P>In a mobile network that is multihomed by multiple mobile routers, a mobile router that loses link connectivity can be replaced by the other mobile routers. We propose a transparent failover mechanism (TFM) to provide seamless Internet services to nodes in the mobile network, which is validated by implementing a real test-bed. Compared to the network mobility basic support protocol, TFM does not require the nodes attached to the failed mobile router to change their addresses, and hence has two advantages: (a) IP connectivity is maintained transparently, and (b) failover is quickly accomplished by avoiding the address re-configuration process in each node.</P>