Tien Nguyen - Academia.edu (original) (raw)

Papers by Tien Nguyen

Systems of Systems - Engineering, Modeling, Simulation and Analysis [Working Title]

The objective of this chapter is to (i) define System-of-Systems Enterprise (SOSE), SOSE Concept ... more The objective of this chapter is to (i) define System-of-Systems Enterprise (SOSE), SOSE Concept of Operations (CONOPS), and SOSE Architecture (SOSEA) CONOPS assessment, and (ii) discuss their differences using examples from existing space and airborne systems. The chapter also describes the SOS design challenges and presents an SOSE Architecture design approach addressing these challenges. In addition, DOD Architecture Framework Version 2.02 (DODAF-v2.02) views will be discussed along with a recommendation for a set of key DODAF views to capture system architecture artifacts with practical examples involving SOS Enterprise architectures for notional space-based communications system and manned airborne Intelligence, Surveillance, and Reconnaissance (ISR) platform.

Phytochemistry, Jan 10, 2018

As part of our continuing research to obtain pharmacologically active compounds from Morus alba L... more As part of our continuing research to obtain pharmacologically active compounds from Morus alba L. (Moraceae), four Diels-Alder type adducts (DAs) [morusalbins A-D], one isoprenylated flavonoid [albanin T], together with twenty-one known phenolic compounds were isolated from its root bark. The chemical structures were established using NMR, MS, and ECD spectra. The DAs including morusalbins A-D, albasin B, macrourin G, yunanensin A, mulberrofuran G and K, and albanol B exhibited strong inhibitory activities against both protein tyrosine phosphatase 1B (PTP1B) (IC, 1.90-9.67 μM) and α-glucosidase (IC, 2.29-5.91 μM). In the kinetic study, morusalbin D, albasin B, and macrourin G showed noncompetitive PTP1B inhibition, with K values of 0.33, 1.00, and 1.09 μM, respectively. In contrast, these DAs together with yunanensin A produced competitive inhibition of α-glucosidase, with K values of 0.64, 0.42, 2.42, and 1.19 μM, respectively. Furthermore, molecular docking studies revealed that ...

Current opinion in structural biology, Jan 6, 2018

Recent achievements in development of protein assembles within cells have extended biosupramolecu... more Recent achievements in development of protein assembles within cells have extended biosupramolecular composites into a new era with versatile applications in the fields of biomaterial and biotechnology. Using methods with biological and physicochemical routes has made this era of research more interesting and challenging. Further advances in protein engineering have facilitated efficient fabrication of supramolecular complexes within living cells. Here, we provide a review of recent efforts to engineer protein assemblies within cells and describe the promising properties of these assemblies.

Bioresource technology, Jan 28, 2015

Membrane adsorption hybrid system (MAHS) was evaluated for the removal of phosphate from a high r... more Membrane adsorption hybrid system (MAHS) was evaluated for the removal of phosphate from a high rate membrane bioreactor (HR-MBR) effluent. The HR-MBR was operated at permeate flux of 30L/m(2)h. The results indicated that the HR-MBR could eliminate 93.1±1.5% of DOC while removing less than 53% phosphate (PO4-P). Due to low phosphate removal by HR-MBR, a post-treatment of strong base anion exchange resin (Dowex(∗)21K-XLT), and zirconium (IV) hydroxide were used as adsorbent in MAHS for further removal of phosphate from HR-MBR effluent. It was found that the MAHS enabled to eliminate more than 85% of PO4-P from HR-MBR effluent. Hence, HR-MBR followed by MAHS lead to simultaneous removal of organics and phosphate in a reliable manner. The experiments were conducted only for a short period to investigate the efficiency of these resins/adsorbents on the removal of phosphorus and high rate MBR for organic removal.

Biodiversity Data Journal, 2015

Background The genus Hoplolaimus Daday, 1905 belongs to the subfamily Hoplolaimine Filipiev, 1934... more Background The genus Hoplolaimus Daday, 1905 belongs to the subfamily Hoplolaimine Filipiev, 1934 of family Hoplolaimidae Filipiev, 1934 (Krall 1990). Daday established this genus on a single female of H. tylenchiformis recovered from a mud hole on Banco Island, Paraguay in 1905 (Sher 1963, Krall 1990). Hoplolaimus species are distributed worldwide and cause damage on numerous agricultural crops (Luc et al. 1990Robbins et al. 1998). In 1992, Handoo and Golden reviewed 29 valid species of genus Hoplolaimus Dayday, 1905 (Handoo and Golden 1992). Siddiqi (2000) recognised three subgenera in Hoplolaimus: Hoplolaimus (Hoplolaimus) with ten species, is characterized by lateral field distinct, with four incisures, excretory pore behind hemizonid; Hoplolaimus (Basirolaimus) with 18 species, is characterized by lateral field with one to three incisures, obliterated, excretory pore anterior to hemizonid, dorsal oesophageal gland quadrinucleate; and Hoplolaimus (Ethiolaimus) with four species is characterized by lateral field with one to three incisures, obliterated; excretory pore anterior to hemizonid, dorsal oesophageal gland uninucleate (Siddiqi 2000). Since then, Hoplolaimus puriensis Ali, Shaheen & Pervez, 2009 has been ‡ ‡ ‡ © Nguyen T et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. described (Ali et al. 2009). Up to now, there have been two species of genus Hoplolaimus reported in Vietnam, viz H. seinhorsti and H. chambus (Nguyen and Nguyen 2000). New information Hoplolaimus bachlongviensis sp. n. was isolated from banana soil in Bach Long Vi Island, Vietnam. The female of this species is described and illustrated below. Some diagnostic characters of this species include body slightly curved ventrally, offset lip region exhibiting three to four annules, lateral field reduced, pharyngeal glands with six nuclei, excretory pore anterior to hemizonid, epiptygma absent, intestine not overlapping rectum and male was not found.

Workshop on Requirements Engineering for Systems, Services and Systems-of-Systems, 2011

This paper addresses the challenges of large commercial and government that struggle with require... more This paper addresses the challenges of large commercial and government that struggle with requirements understanding, increasing delivery quality and estimating costs. The paper discusses Smarter Architecture & Engineering (SmarterAE) as an approach that applies scrutiny, metrics and analysis to architecture, requirements management and engineering as is historically given to development, testing and operations. SmarterAE facilitates business agility by capturing the

IETE Journal of Research, 2005

This paper presents an overview of physical (PHY) and medium access control (MAC) layers for IEEE... more This paper presents an overview of physical (PHY) and medium access control (MAC) layers for IEEE 802.11a, which is a standard of a broadband high-speed wireless local area network (WLAN). IEEE 802.11a uses 5 GHz frequency band and its PHY is based on orthogonal frequency division multiplexing (OFDM). In this paper, we evaluate the OFDMbased PHY and MAC performance of IEEE 802.11a under various practical wideband channel models, which are abstracted from actual propagation measurements. The effects of different transmission modes defined in PHY on the IEEE 802.11 system performance are investigated. We also discuss the impact of link adaptation, which attempts to choose the best-suited transmission mode according to channel conditions, on the overall system performance.

Molecular Therapy, 2006

Abstract Cardiomyopathy is an important cause of morbidity and mortality in children. Deficiency ... more Abstract Cardiomyopathy is an important cause of morbidity and mortality in children. Deficiency of very-long-chain acyl-CoA dehydrogenase (VLCAD), one of several nuclear encoded mitochondrial enzymes that catalyze the initial step in the beta-oxidation of ...

Lecture Notes in Electrical Engineering, 2013

ABSTRACT In this paper, we propose a new method for massive false positive reduction in. Our goal... more ABSTRACT In this paper, we propose a new method for massive false positive reduction in. Our goal is to distinguish between the true recognized masses and the ones which actually normal parenchyma. Our proposal is based on Block Difference Inverse Probability (BDIP) and Support Vector Machine (SVM) for classifying the detected masses. The proposed approach is evaluated in about 2700 ROIs detected from Mini-MIAS database. An accuracy of Az = 0.91 (area under the curve) is obtained.

Frontiers in Heat Pipes, 2013

In Japan, following a major earthquake, a 15-metre tsunami disabled the power supply and cooling ... more In Japan, following a major earthquake, a 15-metre tsunami disabled the power supply and cooling of three Fukushima Daiichi reactors, causing a nuclear accident on 11 March 2011. All three cores largely melted in the first three days. The accident was rated 7 on the INES (International Nuclear Event Scale) scale, due to high radioactive releases in the first few days. After two weeks the three reactors (units 1-3) were stable with water addition but no proper heat sink for removal of decay heat from fuel. By July they were being cooled with recycled water from the new treatment plant, and reactor temperatures had fallen to below 80ºC at the end of October, and official 'cold shutdown condition' was announced in mid December. In this paper, the nuclear power plant No. 4 at Fukushima was chosen for the analysis-thermal power 2,381 MW; electrical power 784 MW; 658 spent fuel bundles (39,456 spent fuel rods); spent fuel water pool volume 1,400 tonnes. Detail analysis of various heat pipe design cases to determine the best design concept in terms of cooling power, construction and cost are presented. The best design when considering thermal safety margin and cost is the heat pipe cooling 0.9 MW; 1,662 heat pipe modules; water temperature will reach to peak 68 °C after 75 hours, and will be saturated at 50 °C after 2,000 hours. The estimated cost for complete heat pipe cooling system is about 2.16 Millions USD.

Proceedings IEEE International Conference on Communications ICC '95, 1995

This paper presents various communication system architectures for multiple-link communications w... more This paper presents various communication system architectures for multiple-link communications with single aperture (MULSA) ground station. The proposed architectures are capable of supporting a multiplicity of spacecraft that are within the beamwidth of a single ground station antenna simultaneously. Both short and long term proposals to address this scenario are discussed. In addition, the paper also discusses the top-level system

Surgical infections, 2010

Glove powder is used as a lubricant on the inner surface of many surgical gloves to aid in donnin... more Glove powder is used as a lubricant on the inner surface of many surgical gloves to aid in donning. Although surgeons routinely wash or wipe their gloves to remove the powder, studies in patients have shown that, at the conclusion of operations in which powdered gloves have been used, the wound retains a substantial amount of residual powder granules. Furthermore, the amount of residual granules is in proportion to the number of gloves that the operating room staff wear. We determined whether glove powder in combination with Staphylococcus aureus when injected into the subcutaneous tissue of the dorsum of the rat would potentiate abscess formation. We combined methicillin-susceptible S. aureus (MSSA) in concentrations of 0, 10(2), 10(3), 10(4), and 10(5) colony forming units (cfu)/mL and starch powder in concentrations of 0, 10, 50, and 100 mg/mL and injected the inoculum into each flank of 105 Sprague-Dawley rats. Animals were euthanized 7 to 10 days after inoculation and examined ...

MILCOM 2002. Proceedings, 2002

In this paper, the impacts of interference from a satellite ground station on a personal communic... more In this paper, the impacts of interference from a satellite ground station on a personal communication system (PCS) are modeled. A semi-analytical model is first developed to predict the BER performance of a typical PCS base station receiver in the presence of interference from a satellite ground station. The model takes into account the relative transmitted power, waveform structures, antenna

MILCOM 2002. Proceedings, 2002

The Advanced Wideband System (AWS) is being developed to provide worldwide, wideband communicatio... more The Advanced Wideband System (AWS) is being developed to provide worldwide, wideband communications capabilities to address the long term needs of the DoD for information transmission, reception, and handling. This system will require wideband fixed-to-fixed, fixed-to-mobile, mobile-to-mobile and other tactical communications services, with maximum data rates on the order of hundreds of megabits per second. Based on the design methodology

Proceedings of the 2012 IEEE Global Engineering Education Conference (EDUCON), 2012

The international community is heavily reliant on the Internet to provide services such as video ... more The international community is heavily reliant on the Internet to provide services such as video phones, video conferences, video-on-demand, tele-shopping, web-advisement and virtual reality. Tertiary networks and telecommunications engineering students are required to learn all aspects about the Internet and Internet services. The open-source, research and teaching platform, Network Simulator (NS) was integrated with the open-source Joint Model (JM) H.264/AVC encoder-decoder to educate students about computer networks. On this integrated educational platform, videos can be encoded and encapsulated into network packets with modifications to JM encoder source code. These packets are sent across a NS simulated network with a simulated NS multicast server. NS multicast clients subscribe to NS multicast servers. Other network traffic can compete with the multicast packets and cause congestion. Traffic shaping, fairness and other networking techniques can be simulated with real video data. Packet loss in such an environment is inevitable. Multicast clients receive the video stream with some losses. Clients' data can be decoded using a modified JM decoder. Lost data can be concealed using error concealment techniques or reconstructed with losses. The integration of NS and JM is ideal to teach the next generation's network and telecommunications engineers, all aspects of network traffic including streaming media, streaming protocols, subscription, traffic congestion, traffic shaping and fairness. This paper describes the necessary modifications to JM and NS and gives examples of educational exercises and discussions.

Proceedings of the 7th joint meeting of the European software engineering conference and the ACM SIGSOFT symposium on The foundations of software engineering on European software engineering conference and foundations of software engineering symposium - ESEC/FSE '09, 2009

Abstract The interplay of multiple objects in object-oriented programming often follows specific ... more Abstract The interplay of multiple objects in object-oriented programming often follows specific protocols, for example certain orders of method calls and/or control structure constraints among them that are parts of the intended object usages. Unfortunately, the information is not always documented. That creates long learning curve, and importantly, leads to subtle problems due to the misuse of objects.

2009 IEEE International Conference on Software Maintenance, 2009

Code clone management has been shown to have several benefits for software developers. When sourc... more Code clone management has been shown to have several benefits for software developers. When source code evolves, clone management requires a mechanism to efficiently and incrementally detect code clones in the new revision. This paper introduces an incremental clone detection tool, called ClemanX. Our tool represents code fragments as subtrees of Abstract Syntax Trees (ASTs), measures their similarity levels based on their characteristic vectors of structural features, and solves the task of incrementally detecting similar code as an incremental distance-based clustering problem. Our empirical evaluation on large-scale software projects shows the usefulness and good performance of ClemanX.

The 2011 International Conference on Advanced Technologies for Communications (ATC 2011), 2011

In this paper, a support vector machine (SVM) classifier has been used to detect a face in an aut... more In this paper, a support vector machine (SVM) classifier has been used to detect a face in an authentication application. A face candidate is first allocated from the input frame and then normalized to 200x200 pixels images. The textureness of candidates is then measured by the combination of BDIP and BVLC moments and classified into face and non-face ones by a SVM classifier which is known as efficient classification tool. In SVM learning, a DB of 2500 faces and 2500 non faces has been created under different light conditions and face expressions. The experiments showed that the effectiveness of the used features for SVM based classification issue in the face-detection system.

Proceedings of the 12th international workshop on Software configuration management - SCM '05, 2005

Versioned hypermedia has shown its success in promoting better understanding and management of ev... more Versioned hypermedia has shown its success in promoting better understanding and management of evolving document collections in many domains. However, providing versioning capability for a hypermedia system raises several important structural and cognitive issues. Our research has produced Molhado, the first hypermedia infrastructure that applies the product versioning model to versioned hypermedia. Molhado not only supports configuration management for hypermedia structures in a fine-grained manner, but also provides version control for individual hyperlinks and document nodes. This paper explains how the product versioning model in Molhado addresses serious issues identified by earlier research on versioned hypermedia. We will also discuss the new issues raised by using this versioning model.

Bioorganic & Medicinal Chemistry Letters, 2014

In this article, we report a convenient and efficient method for the synthesis of new simplified ... more In this article, we report a convenient and efficient method for the synthesis of new simplified derivatives of hemiasterlin in which the α,α-dimethylbenzylic moiety A is replaced by α,β-unsaturated aryl groups as Michael acceptor. Most of these derivatives have a strong cytotoxic activity on three human tumor cell lines (KB, Hep-G2 and MCF7). Analogs 17b and 17f showed a high cytotoxicity against KB and Hep-G2 cancer cell lines comparable to paclitaxel and ellipticine.

Systems of Systems - Engineering, Modeling, Simulation and Analysis [Working Title]

The objective of this chapter is to (i) define System-of-Systems Enterprise (SOSE), SOSE Concept ... more The objective of this chapter is to (i) define System-of-Systems Enterprise (SOSE), SOSE Concept of Operations (CONOPS), and SOSE Architecture (SOSEA) CONOPS assessment, and (ii) discuss their differences using examples from existing space and airborne systems. The chapter also describes the SOS design challenges and presents an SOSE Architecture design approach addressing these challenges. In addition, DOD Architecture Framework Version 2.02 (DODAF-v2.02) views will be discussed along with a recommendation for a set of key DODAF views to capture system architecture artifacts with practical examples involving SOS Enterprise architectures for notional space-based communications system and manned airborne Intelligence, Surveillance, and Reconnaissance (ISR) platform.

Phytochemistry, Jan 10, 2018

As part of our continuing research to obtain pharmacologically active compounds from Morus alba L... more As part of our continuing research to obtain pharmacologically active compounds from Morus alba L. (Moraceae), four Diels-Alder type adducts (DAs) [morusalbins A-D], one isoprenylated flavonoid [albanin T], together with twenty-one known phenolic compounds were isolated from its root bark. The chemical structures were established using NMR, MS, and ECD spectra. The DAs including morusalbins A-D, albasin B, macrourin G, yunanensin A, mulberrofuran G and K, and albanol B exhibited strong inhibitory activities against both protein tyrosine phosphatase 1B (PTP1B) (IC, 1.90-9.67 μM) and α-glucosidase (IC, 2.29-5.91 μM). In the kinetic study, morusalbin D, albasin B, and macrourin G showed noncompetitive PTP1B inhibition, with K values of 0.33, 1.00, and 1.09 μM, respectively. In contrast, these DAs together with yunanensin A produced competitive inhibition of α-glucosidase, with K values of 0.64, 0.42, 2.42, and 1.19 μM, respectively. Furthermore, molecular docking studies revealed that ...

Current opinion in structural biology, Jan 6, 2018

Recent achievements in development of protein assembles within cells have extended biosupramolecu... more Recent achievements in development of protein assembles within cells have extended biosupramolecular composites into a new era with versatile applications in the fields of biomaterial and biotechnology. Using methods with biological and physicochemical routes has made this era of research more interesting and challenging. Further advances in protein engineering have facilitated efficient fabrication of supramolecular complexes within living cells. Here, we provide a review of recent efforts to engineer protein assemblies within cells and describe the promising properties of these assemblies.

Bioresource technology, Jan 28, 2015

Membrane adsorption hybrid system (MAHS) was evaluated for the removal of phosphate from a high r... more Membrane adsorption hybrid system (MAHS) was evaluated for the removal of phosphate from a high rate membrane bioreactor (HR-MBR) effluent. The HR-MBR was operated at permeate flux of 30L/m(2)h. The results indicated that the HR-MBR could eliminate 93.1±1.5% of DOC while removing less than 53% phosphate (PO4-P). Due to low phosphate removal by HR-MBR, a post-treatment of strong base anion exchange resin (Dowex(∗)21K-XLT), and zirconium (IV) hydroxide were used as adsorbent in MAHS for further removal of phosphate from HR-MBR effluent. It was found that the MAHS enabled to eliminate more than 85% of PO4-P from HR-MBR effluent. Hence, HR-MBR followed by MAHS lead to simultaneous removal of organics and phosphate in a reliable manner. The experiments were conducted only for a short period to investigate the efficiency of these resins/adsorbents on the removal of phosphorus and high rate MBR for organic removal.

Biodiversity Data Journal, 2015

Background The genus Hoplolaimus Daday, 1905 belongs to the subfamily Hoplolaimine Filipiev, 1934... more Background The genus Hoplolaimus Daday, 1905 belongs to the subfamily Hoplolaimine Filipiev, 1934 of family Hoplolaimidae Filipiev, 1934 (Krall 1990). Daday established this genus on a single female of H. tylenchiformis recovered from a mud hole on Banco Island, Paraguay in 1905 (Sher 1963, Krall 1990). Hoplolaimus species are distributed worldwide and cause damage on numerous agricultural crops (Luc et al. 1990Robbins et al. 1998). In 1992, Handoo and Golden reviewed 29 valid species of genus Hoplolaimus Dayday, 1905 (Handoo and Golden 1992). Siddiqi (2000) recognised three subgenera in Hoplolaimus: Hoplolaimus (Hoplolaimus) with ten species, is characterized by lateral field distinct, with four incisures, excretory pore behind hemizonid; Hoplolaimus (Basirolaimus) with 18 species, is characterized by lateral field with one to three incisures, obliterated, excretory pore anterior to hemizonid, dorsal oesophageal gland quadrinucleate; and Hoplolaimus (Ethiolaimus) with four species is characterized by lateral field with one to three incisures, obliterated; excretory pore anterior to hemizonid, dorsal oesophageal gland uninucleate (Siddiqi 2000). Since then, Hoplolaimus puriensis Ali, Shaheen & Pervez, 2009 has been ‡ ‡ ‡ © Nguyen T et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. described (Ali et al. 2009). Up to now, there have been two species of genus Hoplolaimus reported in Vietnam, viz H. seinhorsti and H. chambus (Nguyen and Nguyen 2000). New information Hoplolaimus bachlongviensis sp. n. was isolated from banana soil in Bach Long Vi Island, Vietnam. The female of this species is described and illustrated below. Some diagnostic characters of this species include body slightly curved ventrally, offset lip region exhibiting three to four annules, lateral field reduced, pharyngeal glands with six nuclei, excretory pore anterior to hemizonid, epiptygma absent, intestine not overlapping rectum and male was not found.

Workshop on Requirements Engineering for Systems, Services and Systems-of-Systems, 2011

This paper addresses the challenges of large commercial and government that struggle with require... more This paper addresses the challenges of large commercial and government that struggle with requirements understanding, increasing delivery quality and estimating costs. The paper discusses Smarter Architecture & Engineering (SmarterAE) as an approach that applies scrutiny, metrics and analysis to architecture, requirements management and engineering as is historically given to development, testing and operations. SmarterAE facilitates business agility by capturing the

IETE Journal of Research, 2005

This paper presents an overview of physical (PHY) and medium access control (MAC) layers for IEEE... more This paper presents an overview of physical (PHY) and medium access control (MAC) layers for IEEE 802.11a, which is a standard of a broadband high-speed wireless local area network (WLAN). IEEE 802.11a uses 5 GHz frequency band and its PHY is based on orthogonal frequency division multiplexing (OFDM). In this paper, we evaluate the OFDMbased PHY and MAC performance of IEEE 802.11a under various practical wideband channel models, which are abstracted from actual propagation measurements. The effects of different transmission modes defined in PHY on the IEEE 802.11 system performance are investigated. We also discuss the impact of link adaptation, which attempts to choose the best-suited transmission mode according to channel conditions, on the overall system performance.

Molecular Therapy, 2006

Abstract Cardiomyopathy is an important cause of morbidity and mortality in children. Deficiency ... more Abstract Cardiomyopathy is an important cause of morbidity and mortality in children. Deficiency of very-long-chain acyl-CoA dehydrogenase (VLCAD), one of several nuclear encoded mitochondrial enzymes that catalyze the initial step in the beta-oxidation of ...

Lecture Notes in Electrical Engineering, 2013

ABSTRACT In this paper, we propose a new method for massive false positive reduction in. Our goal... more ABSTRACT In this paper, we propose a new method for massive false positive reduction in. Our goal is to distinguish between the true recognized masses and the ones which actually normal parenchyma. Our proposal is based on Block Difference Inverse Probability (BDIP) and Support Vector Machine (SVM) for classifying the detected masses. The proposed approach is evaluated in about 2700 ROIs detected from Mini-MIAS database. An accuracy of Az = 0.91 (area under the curve) is obtained.

Frontiers in Heat Pipes, 2013

In Japan, following a major earthquake, a 15-metre tsunami disabled the power supply and cooling ... more In Japan, following a major earthquake, a 15-metre tsunami disabled the power supply and cooling of three Fukushima Daiichi reactors, causing a nuclear accident on 11 March 2011. All three cores largely melted in the first three days. The accident was rated 7 on the INES (International Nuclear Event Scale) scale, due to high radioactive releases in the first few days. After two weeks the three reactors (units 1-3) were stable with water addition but no proper heat sink for removal of decay heat from fuel. By July they were being cooled with recycled water from the new treatment plant, and reactor temperatures had fallen to below 80ºC at the end of October, and official 'cold shutdown condition' was announced in mid December. In this paper, the nuclear power plant No. 4 at Fukushima was chosen for the analysis-thermal power 2,381 MW; electrical power 784 MW; 658 spent fuel bundles (39,456 spent fuel rods); spent fuel water pool volume 1,400 tonnes. Detail analysis of various heat pipe design cases to determine the best design concept in terms of cooling power, construction and cost are presented. The best design when considering thermal safety margin and cost is the heat pipe cooling 0.9 MW; 1,662 heat pipe modules; water temperature will reach to peak 68 °C after 75 hours, and will be saturated at 50 °C after 2,000 hours. The estimated cost for complete heat pipe cooling system is about 2.16 Millions USD.

Proceedings IEEE International Conference on Communications ICC '95, 1995

This paper presents various communication system architectures for multiple-link communications w... more This paper presents various communication system architectures for multiple-link communications with single aperture (MULSA) ground station. The proposed architectures are capable of supporting a multiplicity of spacecraft that are within the beamwidth of a single ground station antenna simultaneously. Both short and long term proposals to address this scenario are discussed. In addition, the paper also discusses the top-level system

Surgical infections, 2010

Glove powder is used as a lubricant on the inner surface of many surgical gloves to aid in donnin... more Glove powder is used as a lubricant on the inner surface of many surgical gloves to aid in donning. Although surgeons routinely wash or wipe their gloves to remove the powder, studies in patients have shown that, at the conclusion of operations in which powdered gloves have been used, the wound retains a substantial amount of residual powder granules. Furthermore, the amount of residual granules is in proportion to the number of gloves that the operating room staff wear. We determined whether glove powder in combination with Staphylococcus aureus when injected into the subcutaneous tissue of the dorsum of the rat would potentiate abscess formation. We combined methicillin-susceptible S. aureus (MSSA) in concentrations of 0, 10(2), 10(3), 10(4), and 10(5) colony forming units (cfu)/mL and starch powder in concentrations of 0, 10, 50, and 100 mg/mL and injected the inoculum into each flank of 105 Sprague-Dawley rats. Animals were euthanized 7 to 10 days after inoculation and examined ...

MILCOM 2002. Proceedings, 2002

In this paper, the impacts of interference from a satellite ground station on a personal communic... more In this paper, the impacts of interference from a satellite ground station on a personal communication system (PCS) are modeled. A semi-analytical model is first developed to predict the BER performance of a typical PCS base station receiver in the presence of interference from a satellite ground station. The model takes into account the relative transmitted power, waveform structures, antenna

MILCOM 2002. Proceedings, 2002

The Advanced Wideband System (AWS) is being developed to provide worldwide, wideband communicatio... more The Advanced Wideband System (AWS) is being developed to provide worldwide, wideband communications capabilities to address the long term needs of the DoD for information transmission, reception, and handling. This system will require wideband fixed-to-fixed, fixed-to-mobile, mobile-to-mobile and other tactical communications services, with maximum data rates on the order of hundreds of megabits per second. Based on the design methodology

Proceedings of the 2012 IEEE Global Engineering Education Conference (EDUCON), 2012

The international community is heavily reliant on the Internet to provide services such as video ... more The international community is heavily reliant on the Internet to provide services such as video phones, video conferences, video-on-demand, tele-shopping, web-advisement and virtual reality. Tertiary networks and telecommunications engineering students are required to learn all aspects about the Internet and Internet services. The open-source, research and teaching platform, Network Simulator (NS) was integrated with the open-source Joint Model (JM) H.264/AVC encoder-decoder to educate students about computer networks. On this integrated educational platform, videos can be encoded and encapsulated into network packets with modifications to JM encoder source code. These packets are sent across a NS simulated network with a simulated NS multicast server. NS multicast clients subscribe to NS multicast servers. Other network traffic can compete with the multicast packets and cause congestion. Traffic shaping, fairness and other networking techniques can be simulated with real video data. Packet loss in such an environment is inevitable. Multicast clients receive the video stream with some losses. Clients' data can be decoded using a modified JM decoder. Lost data can be concealed using error concealment techniques or reconstructed with losses. The integration of NS and JM is ideal to teach the next generation's network and telecommunications engineers, all aspects of network traffic including streaming media, streaming protocols, subscription, traffic congestion, traffic shaping and fairness. This paper describes the necessary modifications to JM and NS and gives examples of educational exercises and discussions.

Proceedings of the 7th joint meeting of the European software engineering conference and the ACM SIGSOFT symposium on The foundations of software engineering on European software engineering conference and foundations of software engineering symposium - ESEC/FSE '09, 2009

Abstract The interplay of multiple objects in object-oriented programming often follows specific ... more Abstract The interplay of multiple objects in object-oriented programming often follows specific protocols, for example certain orders of method calls and/or control structure constraints among them that are parts of the intended object usages. Unfortunately, the information is not always documented. That creates long learning curve, and importantly, leads to subtle problems due to the misuse of objects.

2009 IEEE International Conference on Software Maintenance, 2009

Code clone management has been shown to have several benefits for software developers. When sourc... more Code clone management has been shown to have several benefits for software developers. When source code evolves, clone management requires a mechanism to efficiently and incrementally detect code clones in the new revision. This paper introduces an incremental clone detection tool, called ClemanX. Our tool represents code fragments as subtrees of Abstract Syntax Trees (ASTs), measures their similarity levels based on their characteristic vectors of structural features, and solves the task of incrementally detecting similar code as an incremental distance-based clustering problem. Our empirical evaluation on large-scale software projects shows the usefulness and good performance of ClemanX.

The 2011 International Conference on Advanced Technologies for Communications (ATC 2011), 2011

In this paper, a support vector machine (SVM) classifier has been used to detect a face in an aut... more In this paper, a support vector machine (SVM) classifier has been used to detect a face in an authentication application. A face candidate is first allocated from the input frame and then normalized to 200x200 pixels images. The textureness of candidates is then measured by the combination of BDIP and BVLC moments and classified into face and non-face ones by a SVM classifier which is known as efficient classification tool. In SVM learning, a DB of 2500 faces and 2500 non faces has been created under different light conditions and face expressions. The experiments showed that the effectiveness of the used features for SVM based classification issue in the face-detection system.

Proceedings of the 12th international workshop on Software configuration management - SCM '05, 2005

Versioned hypermedia has shown its success in promoting better understanding and management of ev... more Versioned hypermedia has shown its success in promoting better understanding and management of evolving document collections in many domains. However, providing versioning capability for a hypermedia system raises several important structural and cognitive issues. Our research has produced Molhado, the first hypermedia infrastructure that applies the product versioning model to versioned hypermedia. Molhado not only supports configuration management for hypermedia structures in a fine-grained manner, but also provides version control for individual hyperlinks and document nodes. This paper explains how the product versioning model in Molhado addresses serious issues identified by earlier research on versioned hypermedia. We will also discuss the new issues raised by using this versioning model.

Bioorganic & Medicinal Chemistry Letters, 2014

In this article, we report a convenient and efficient method for the synthesis of new simplified ... more In this article, we report a convenient and efficient method for the synthesis of new simplified derivatives of hemiasterlin in which the α,α-dimethylbenzylic moiety A is replaced by α,β-unsaturated aryl groups as Michael acceptor. Most of these derivatives have a strong cytotoxic activity on three human tumor cell lines (KB, Hep-G2 and MCF7). Analogs 17b and 17f showed a high cytotoxicity against KB and Hep-G2 cancer cell lines comparable to paclitaxel and ellipticine.