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Search Results: 1 - 10 of 321798 matches for " James J. (Jong hyuk) Park "
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A Secure and Robust Connectivity Architecture for Smart Devices and Applications
Taeshik Shon,Kyusuk Han,James J. (Jong hyuk) Park,Young-Sik Jeong
EURASIP Journal on Wireless Communications and Networking , 2011, DOI: 10.1155/2011/176393
A Novel Approach to Detect Network Attacks Using G-HMM-Based Temporal Relations between Internet Protocol Packets
Taeshik Shon,Kyusuk Han,James J. (Jong Hyuk) Park,Hangbae Chang
EURASIP Journal on Wireless Communications and Networking , 2011, DOI: 10.1155/2011/210746
Throughput Fairness Enhancement Using Differentiated Channel Access in Heterogeneous Sensor Networks
Eui-Jik Kim,Taeshik Shon,James Jong Hyuk Park,Young-Sik Jeong
Sensors , 2011, DOI: 10.3390/s110706629
Abstract: Nowadays, with wireless sensor networks (WSNs) being widely applied to diverse applications, heterogeneous sensor networks (HSNs), which can simultaneously support multiple sensing tasks in a common sensor field, are being considered as the general form of WSN system deployment. In HSNs, each application generates data packets with a different size, thereby resulting in fairness issues in terms of the network performance. In this paper, we present the design and performance evaluation of a differentiated channel access scheme (abbreviated to DiffCA) to resolve the fairness problem in HSNs. DiffCA achieves fair performance among the application groups by providing each node with an additional backoff counter, whose value varies according to the size of the packets. A mathematical model based on the discrete time Markov chain is presented and is analyzed to measure the performance of DiffCA. The numerical results show that the performance degradation of disadvantaged application groups can be effectively compensated for by DiffCA. Simulation results are given to verify the accuracy of the numerical model.
An Emergency-Adaptive Routing Scheme for Wireless Sensor Networks for Building Fire Hazard Monitoring
Yuanyuan Zeng,Cormac J. Sreenan,Lanny Sitanayah,Naixue Xiong,Jong Hyuk Park,Guilin Zheng
Sensors , 2011, DOI: 10.3390/s110302899
Abstract: Fire hazard monitoring and evacuation for building environments is a novel application area for the deployment of wireless sensor networks. In this context, adaptive routing is essential in order to ensure safe and timely data delivery in building evacuation and fire fighting resource applications. Existing routing mechanisms for wireless sensor networks are not well suited for building fires, especially as they do not consider critical and dynamic network scenarios. In this paper, an emergency-adaptive, real-time and robust routing protocol is presented for emergency situations such as building fire hazard applications. The protocol adapts to handle dynamic emergency scenarios and works well with the routing hole problem. Theoretical analysis and simulation results indicate that our protocol provides a real-time routing mechanism that is well suited for dynamic emergency scenarios in building fires when compared with other related work.
Retinoid and Ethanol-Sensitive Benzo(α)Pyrene Induction of Cytochrome P450 in Human Keratinocytes  [PDF]
John J. Wille, Jong Y. Park
Journal of Cancer Therapy (JCT) , 2012, DOI: 10.4236/jct.2012.36141
Abstract: Polycyclic aromatic hydrocarbons (PAHs) induce cytochrome P-450 monoxygenase enzymes that catalyze the formation of DNA adducts. We investigated the effects benzo(α)pyrene (B[α]P) alone or in combination with ethanol on normal human keratinocyte (NHK) growth, induction of cytochrome P-4501A1 (CYP1A1), and modulation of these treatments by retinoic acid (RA) in a serum-free culture medium. Growth-arrested confluent NHK serum-free cultures were treated with B[α]P alone or in combination with ethanol and RA. The effects on CYP1A1 enzyme activity were investigated. B[α]P treatment alone was not toxic to post-confluent cells; sub-toxic ethanol stimulated cell growth regardless B[α]P treatment. No CYP1A1 activity was detected in control or ethanol-treated NHK cell cultures. B[α]P alone induced CYP1A1 activity, and B[α]P plus ethanol treatment further enhanced B[α]P-induced CYP1A1 activity. Pretreatment with all-trans-RA (t-RA) abolished ethanol enhancement of CYP1A1 activity. There is a synergistic action of ethanol in combination with PAH on induction of P-450 cytochrome enzymes. By contrast, RA reverses ethanol enhancement implying a role for retinoid therapy in counteracting the risk posed by combined alcohol and PAH exposure on epidermal cell carcinogenesis.
Cell Cycle Arrest Mediates Global DNA Methylation Patterns in Normal Human Keratinocytes, Epidermoid Carcinoma Cells and Murine Embryonic Fibroblasts  [PDF]
John J. Wille, Jong Y. Park
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.41030

The 5-methylationcytosine (5-MC) DNA content of murine embryonic fibroblasts arrested in G1 by four growth conditions (Gc, Gn, Gd, and Gs) were hypermethylated relative to rapidly growing (RG) fibroblasts. Normal human keratinocytes (NHK) arrested in G1 by suspension were hypermethylated relative to RG cultures. Four RG cultures of epidermoid carcinoma cells (ECC) were hypomethylated relative to RG NHK cultures, and two cultures (SCC25 and A431) were further hypomethylated by SUS-induced arrest. Linear regression analyses established a positive linear correlation between growth rate and 5-MC content for three murine fibroblasts lines, and a negative correlation for both NHK and ECC lines.

Effects of Okadaic Acid, Retinoic Acid, and Phorbol Myristate Acetate Tumor Promoter on Oncogene Expression  [PDF]
John J. Wille, Jong Y. Park
Journal of Cancer Therapy (JCT) , 2014, DOI: 10.4236/jct.2014.56068

The effect of okadaic acid (OA) on proto-oncogene protein expression of c-neu, c-myc, v-rasH, EGFR, and phosphotyrosine-containing phosphoproteins (P-Tyr) was investigated in rapidly growing (RG) normal human keratinocytes (NHK) and in SV-40 virally-transformed keratinocytes (SVK) cultured in a growth factor supplemented serum-free medium as assessed by indirect immunofluorescence microscopy. P-Tyr positively stains cell surface antigens (cytoplasm) diffusely at monopolar sites in RG NHK cultures. OA-treatment intensifies cytoplasmic P-Tyr staining at localized monopolar intercellular focal adhesion (IFA) sites with reduced cytoplasmic staining. P-Tyr expression was predominate at IFA sites with little cytoplasmic staining in RG SVK cultures. OA-treatment increased monopolar P-Tyr staining and cytoplasmic staining. OA-treatment in RG NHK cultures intensified cytoplasmic staining of c-myc and EGFR (epidermal growth factor receptor) expression. OA-treatment in RG NHK and SVK cultures intensified c-neu staining at monopolar IFA sites and intensified c-neu staining at both cytoplasmic and bipolar IFA sites in RG SVK cells. OA was especially cytotoxic for SVK cells. RA treatment decreased c-neu expression in RG NHK cultures while TPA treatment has a lesser effect on both cytoplasmic and IFA sites. RA treatment also decreased P-Tyr staining in both NHK and SVK cells. Again, TPA had a lesser inhibitory effect on P-Tyr staining pattern. RA-treatment had a similar effect on P-Tyr staining of RG cultures of a mouse fibroblast cell line. These results confirm the generality of OA, RA and TPA on the regulation of oncogene expression in both normal and malignantly transformed keratinocytes.

An Emergency-Adaptive Routing Scheme for Wireless Sensor Networks for Building Fire Hazard Monitoring
Yuanyuan Zeng,Naixue Xiong,Jong Hyuk Park,Guilin Zheng
Sensors , 2010, DOI: 10.3390/s100606128
Abstract: This paper has been retracted on 4 March 2011. The paper is republished with the authorship and acknowledgements fully disclosed as Sensors 2011, 11, 2899-2919; doi:10.3390/s110302899. Available at http://www.mdpi.com/1424-8220/11/3/2899/.
Power-Aware and Reliable Sensor Selection Based on Trust for Wireless Sensor Networks
Guangjie Han,Lei Shu,Jianhua Ma,Jong Hyuk Park
Journal of Communications , 2010, DOI: 10.4304/jcm.5.1.23-30
Abstract: Wireless Sensor Networks (WSNs) is temporarily formed, operated and managed by the nodes themselves. In a complex WSN, malicious nodes are well disguised, and they can attack the entire network on specific purpose by utilizing the natural cooperation of nodes. The error-prone characteristic of sensor nodes can also cause instability in WSN. Therefore, how to choose one or more suitable sensor nodes to collaborate towards a better system performance is a critical issue. In this paper, we construct a new trust model for WSNs based on the trust mechanism in human society. Based on this trust model, we propose a novel power-aware and reliable scheme for sensor selection (PRS). The remaining energy of a node can be considered as an important restrictive factor for the proposed scheme. Simulation results show that PRS scheme can improve the system stability, defend against the attacks of malicious nodes, and prolong the lifetime of WSNs, effectively.
Intelligent Systems for Future Generation Wireless Networks
Jong Hyuk Park,Yuh-Shyan Chen,Athanasios V. Vasilakos
EURASIP Journal on Wireless Communications and Networking , 2008, DOI: 10.1155/2008/370586
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