Stereotactic Body Radiation Therapy in Stage I Non-small Cell Lung Cancer Patients with Peripheral Tumors in Vietnam

( Luan Pham Van ),( Tien Nguyen Dinh ),( Ha Le Ngoc ),( Son Mai Hong ),( Bieu Bui Quang ),( Tuan Nguyen Van ) 대한결핵 및 호흡기학회 2021 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.129 No.-

Objective Stereotactic Body Radiation Therapy (SBRT) was indicated for early-stage non-small cell lung cancer (NSCLC) patients inoperable. The purpose of the study was evaluated the result of SBRT in stage I NSCLC patients (T1-2aN0M0) with peripheral tumors. Methods Prospective, follow-up 23 patients with stage T1-2aN0M0 NSCLC with peripheral tumor, who were received SBRT, followup and evaluated from January, 2015 to January, 2020. The primary endpoints were Objective Response Rate (ORR), Disease Control Rate (DCR), Progression Free Survival (PFS), the second endpoints were Overall Survival (OS) and Toxicity. Results The average age was 65.13 years-old, the mean of diameter was 3.31cm, the mean of SUVmax value was 7.77. The stage of the tumor is mostly T2a (60,9%). The median of follow-up was 26 months, ORR was 91.3%, DCR was 95.7%. The median PFS was 26 months, median OS was 58 months, the ratio of OS in 1 year, 2 years, 3 years, 4 years, 5 years were 95.7%, 65.2%, 39.1%, 26.1% and 17.4%, respectively. The common of adverse events was pneumonitis due to SBRT at 9 patients, but mainly was grade 1, no patients have pneumonitis grade 4 and 5. No clinically significant changes in pulmonary function following SBRT for earlystage NSCLC. Conclusion SBRT was a good option for patients with stage I NSCLC, there was no significant difference in survival between patients who refused surgery and those who have medical inoperable and this is a safe treatment for patients.

A Comparison of Computation Offloading Schemes in Multi-Access Edge Computing

Luan N.T. Huynh,Xuan-Qui Pham,Tri D.T. Nguyen,Eui-Nam Huh 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.6

Identifying New Technologies in Product and Processes through Patent Databanks

Luan Carlos Santos Silva,Carla Schwengber ten Caten,Silvia Gaia,Renata Tilemann Facó,Lidiana Zocche,Rosana Travessini 한국유통과학회 2015 The Journal of Industrial Distribution & Business( Vol.6 No.3

Purpose - This paper’s aim is to analyze the technological information in patent databanks as a strategy in prospecting for new technologies. Research design, data, and methodology - We detail the major free electronic database sources for patent information, the patent documents, the patent document structures, INID codes (Internationally Agreed Numbers for the Identification of Data), indexation, references, and classification notions. Additionally, we review and analyze information on the activities of the Center of Dissemination Documentation and Technological Information (CEDIN) from the National Institute of Intellectual Property (INPI) of Brazil for the period 2000 to 2011. Results - The research shows that the technological information contained in the patents could provide a wide range of functionality within companies and universities. Conclusions - In recent years, (CEDIN), a specialist in intellectual property, has been serving internal and external users by providing guidance on the basis of patents and other literature, but the number of users served is still small. In order to familiarize more potential users of such technological information, task forces should be created among INPI, universities, and companies.

Strain rate sensitivity in commercial pure titanium: The competition between slip and deformation twinning

Luan, Qinmeng,Britton, T. Benjamin,Jun, Tea-Sung Elsevier 2018 Materials science & engineering. properties, micro Vol.734 No.-

<P><B>Abstract</B></P> <P>Titanium alloys are widely used in light weight applications such as jet engine fans, where their mechanical performance under a range of loading regimes is important. Titanium alloys are mechanically anisotropic with respect to crystallographic orientation, and remarkably titanium creeps at room temperature. This means that the strain rate sensitivity (SRS) and stress relaxation performance are critical in predicting component life. In this work, we focus on systematically exploring the macroscopic SRS of Grade 1 commercially pure titanium (CP Ti) with varying grain sizes and texture using uniaxial compression. Briefly, we find that Ti samples had positive SRS and samples compressed along the sheet rolling direction (RD) (i.e. soft grains dominant) were less rate sensitive than bars compressed along the sheet normal direction (ND) (i.e. hard grains dominant). We attribute this rate sensitivity to the relative activity of slip and twinning. Within the grain size range of ~ 317 ± 7 μ m , we observe an increase in the rate sensitivity, where volume fraction of { 10 1 ̅ 2 } < 10 1 ̅ 1 > T1 tensile twins was low, and the twin width at different strain rates were similar. These observations imply that the macroscopic rate sensitivity is controlled by the ensemble behaviour of local deformation processes: the amount of slips accumulated at grain boundaries affects the SRS, which is grain size and texture dependent. We hope that this experimental study motivates mechanistic modelling studies using crystal plasticity, including strain rate sensitivity and twinning, to predict the performance of titanium alloys.</P>

Application of Independent Finance Certification Agency in the Decision Process of Vendor Selection

Luan Chunxiao 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.5

This paper introduces independent finance certification agency to supervise the vendor selection process under the circumstance of the dynamic and incomplete information market. Using the signaling theory under unsymmetric information of game theory, a multidimension signaling model of the strategic choice is established. The game model is set up and the equilibrium calculated out following the description of the key elements of the buyer and vendor in above market. Upon separating equilibrium, the provider dispatches the signal stands for his actual category to maintain the performance of the market. Upon pool equilibrium, the inefficient provider rather than efficient one occupies the core position which results in loss of the latter. Case result shows that the buyer can adopt the signals from the Independent finance certification agency as a significant element when making decision. As a result the introduction of independent finance certification agency can effectively and efficiently supervise the vendor selection process in incomplete information market.

EXAMPLES OF SIMPLY REDUCIBLE GROUPS

Luan, Yongzhi Korean Mathematical Society 2020 대한수학회지 Vol.57 No.5

Simply reducible groups are important in physics and chemistry, which contain some of the important groups in condensed matter physics and crystal symmetry. By studying the group structures and irreducible representations, we find some new examples of simply reducible groups, namely, dihedral groups, some point groups, some dicyclic groups, generalized quaternion groups, Heisenberg groups over prime field of characteristic 2, some Clifford groups, and some Coxeter groups. We give the precise decompositions of product of irreducible characters of dihedral groups, Heisenberg groups, and some Coxeter groups, giving the Clebsch-Gordan coefficients for these groups. To verify some of our results, we use the computer algebra systems GAP and SAGE to construct and get the character tables of some examples.

Polyurethane sponges decorated with reduced graphene oxide and silver nanowires for highly stretchable gas sensors

Luan, Yange,Zhang, Shaolin,Nguyen, Thuy Hang,Yang, Woochul,Noh, Jin-Seo Elsevier 2018 Sensors and actuators. B Chemical Vol.265 No.-

<P><B>Abstract</B></P> <P>Unlike the stretchable physical sensors such as stretchable pressure sensors, strain sensors, and temperature sensors, few works have been reported on the stretchable gas sensors. This study presents that stretchable gas sensors can be fabricated by decorating reduced graphene oxide/silver nanowires (rGO/AgNWs) hybrids on the porous polyurethane (PU) sponges using a facile dip-coating method. The sensors show good room-temperature responses to NO<SUB>2</SUB> gas under both a bending strain (r = 3 mm) and a large tensile strain up to 60%. The response of about −15% is measured at a 50 ppm of NO<SUB>2</SUB> under a 60% strain. Furthermore, reducing gases like acetone and ethanol can also be detected under the large strains. The results of this study offer a new insight into realization of highly stretchable and easy-to-fabricate gas sensors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly stretchable gas sensors are fabricated by the dip-coating method. </LI> <LI> The electrical properties of the sensors can be easily tuned. </LI> <LI> The sensors can detect an oxidizing gas, NO<SUB>2</SUB>, and reducing gases, acetone and ethanol. </LI> <LI> The stretchable gas sensors work stably even under large strains up to 60%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Overview of Environmental Issues in China

Luan, Sheng Ji 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1

This report assesses several environmental problems in which environmental pollution plays a major role in China. The focus of this report is on the delivery of information on pressures, state and impact. Furthermore the trends in the main driving forces are described influencing the state of the environment. For each problem, the DPSIR approach is followed in this report.

Energy Efficiency Assessment in Plunge-Face Grinding of Cemented Tungsten Carbide Cutting Inserts

Luan Carreira,Amauri Hassui,Carlos Ventura 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.6

Due to the high demand for electricity in the manufacturing industry and the efforts to reduce environmental impact, investigations to increase energy efficiency in machining processes have been increasingly carried out. However, information on the behavior of insert grinding process is rarely found. Within this context, this work presents results related to the influence of grinding parameters and abrasive tool characteristics on the energy efficiency during plunge-face grinding of cemented tungsten carbide cutting inserts. For this, grinding forces and consumed electrical energy were measured during the process and sustainability indexes to analyze the relation between insert quality (surface and edge roughness) and consumed energy were calculated in different process conditions. As a result, it was observed that grinding parameters had little influence on insert quality, but an increase in the axial feed speed reduced the consumed energy in approximately 60%, leading to sustainability indexes next to one, i.e., to a greater equilibrium between energy consumption and quality properties.

Efficient Single Vessel Multi-enzymatic Glycosylation for Bioconversion of Tetracyclines Antibiotics to Novel Glucoside Derivatives

Luan Luong Chu,Ramesh Prasad Pandey,Tae-Su Kim,Van Thuy Thi Pham,Jae Kyung Sohng 한국당과학회 2018 한국당과학회 학술대회 Vol.2018 No.01

Single vessel multi-enzyme UDP-α-D-glucose recycling system was coupled with a forward glucosylation reaction to produce glucose moiety conjugated novel derivatives of different tetracycline antibiotic analogues. Among five tetracycline analogues used for the reaction, four molecules (chlorotetracycline, doxytetracycline, meclotetracycline, and minotetracycline) were accepted by a glycosyltransferase enzyme, YjiC, from Bacillus licheniformis to produce glucoside derivatives. However, the enzyme was unable to conjugate sugar unit to rolitetracycline. All glucosides of tetracycline derivatives were characterized by ultraviolet absorbance maxima, ultra-pressure liquid chromatography coupled with photo-diode-array, and high-resolution quadruple time-of-flight electrospray mass spectrometry analyses. These synthesized glucosides are novel tetracycline derivatives. The conversion of tetracycline analogues to respective glucosides has been found to be very low yet. This gives the clue that the enzyme has low preferences toward tetracycline molecules. Attachment of bulky group in rolitetracycline might have prevented the molecule to reach the catalytic cleft of GT enzyme. Results of this research could become a basis to explore the possibility of synthesizing glucosylated derivatives of different tetracyclines using GT enzyme.