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Analysis of opto-thermal interaction of porcine stomach tissue with 808-nm laser for endoscopic submucosal dissection

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Journal of Innovative Optical Health Sciences 2015年第6期8卷 81-91页

作者： Seongjun Kim M.Tamim Hossain don Haeng Lee Jung Kyung Kim Department of Mechanical Engineering Graduate School Kookmin University Seoul 136-702Republic of Korea Department of Integrative Biomedical Science and Engineering Graduate SchoolKookmin University Seoul 136-702Republic of Korea Division of Gastroenterology Department of Internal Medicine Inha University School of Medicine National Center of Efficacy Evaluation for the Development of Health Products Targeting Digestive Disorders Utah-Inha DDS&Advanced Therapeutics Research Center 27 Inhang-ro Jung-guIncheon 400-711Republic of Korea Department of Mechanical Engineering Kookmin University Seoul 136-702 Republic of Korea

In endoscopic submucosal dissection(ESD),the narrow gastrointestinal space can cause difficulty in surgical *** ablation apparatuses with high-power CO_(2) lasers or Nd:YAG lasers have been developed to facilitate endoscopic surgical *** studied the interaction of 808-nm laser light with a porcine stomach tissue,with the aim of developing a therapeutic medical device that can remove lesions at the gastrointestinal wall by irradiating a near-infrared laser light incorporated in an endoscopic *** perforation depths at the porcine fillet and the stomach tissues linearly increased in the range of 2–8mm in proportion to the laser energy density of 63.7–382 kJ/cm^(2).Despite the distinct structural and compositional di®erence,the variation of the perforation depth between the stomach and the fillet was not found at 808-nm wavelength in our *** further studied the laser–tissue interaction by changing the concentration of the methyl blue solution used conventionally as a submucosal fluidic cushion(SFC)in ESD *** temperature of the mucosal layer increased more rapidly at higher concentration of the methyl blue solution,because of enhanced light absorption at the SFC *** insertion of the SFC would protect the muscle layer from thermal *** confirmed that more effective laser treatment should be enabled by tuning the opto-thermal properties of the *** study can contribute to the optimization of the driving parameters for laser incision techniques as an alternative to conventional surgical interventions.

关键词： Near-infrared laser surgical intervention laser-tissue interaction submucosal fluid cushion temperature distribution

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Educational psychology windows on classrooms Paul Eggen, don Kauchak 6th ed.

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2004年

作者： Paul Eggen don Kauchak

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多结果三值图像多重构(英文)

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华南理工大学学报（自然科学版） 2013年第7期41卷 114-119页

作者： Chuanlin Liu Jeanpierre Guédon LUNAM Université Université de NantesIRCCyN UMR CNRS 6597 (Institut de Recherche en Communications et Cybernétique de Nantes) Polytech Nantes

少量的投影数据不能保证重构的完成,即使所研究的图像内只有3种质地.此前提出的Line Mojette算法能够在少量投影数据状况下完成重构,但仅限于单个且完全精确的重构结构能够得到的状况.为此,文中在Line Mojette算法的基础上,采用树分解... 详细信息

少量的投影数据不能保证重构的完成,即使所研究的图像内只有3种质地.此前提出的Line Mojette算法能够在少量投影数据状况下完成重构,但仅限于单个且完全精确的重构结构能够得到的状况.为此,文中在Line Mojette算法的基础上,采用树分解来推演出一个名为Tree Line Mojette的算法来对三值图像进行重构,该算法可以在Line Mojette算法不能完成重构的情况下给出所有可能的重构结果.

关键词：三值图像重构 Mojette变换 LineMojette变换树分解

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Coastal eutrophication, land use changes and Ceratium furca (Dinophyceae) blooms in Pago Pago Harbor, American Samoa 2007-2009

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Chinese Journal of Oceanology and Limnology 2011年第4期29卷 790-794页

作者： Steve L. MORTON Andrew SHULER Jeff PATERNOSTER Sharon FANOLUA don VARGO NOAA/National Ocean Service Marine Biotoxins Program Charleston SC 29412 USA American Samoa Community College Community and Natural Resources Pago Pago American Samoa 96799 USA

The bloom forming dinoflagellate, Ceratium furca, has been linked with coastal eutrophication worldwide in tropical and subtropical locations. During the summer of 2007, an unusual 6-month long bloom of C. furca was observed in Pago Pago Harbor, Tutuila Island, American Samoa. Incidents of dinoflagellate blooms in this area have not been previously reported. The bloom was first reported in May and dissipated in November 2007. In February-March 2009, a similar C. furca bloom was observed. During both blooms, no fish mortality events were reported. Maximum cell counts were observed on September 20, 2007 at 9 200 cell/mL. At this time, total nitrogen was measured at 1.2 mg/L while total phosphate was below detection limits. Changes in land use practices may have been the primary driver of these blooms. Intense fertilization of athletic fields coupled with ineffective management strategies is hypothesized to have a direct link to the increase in nutrients found in the Pago Pago Harbor and may have been the trigger for the initialization of these blooms. During 2008, the fields were not used due to an infestation of the fire ant, Solenopsis geminata. Once controlled, the fields were opened again in 2009 and fertilizers were applied in January, a month before the bloom was observed.

关键词： eutrophication American Samoa Ceratium furca

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Two-Dimensional Multi-Domain Hybrid Spectral-WENO Methods for Conservation Laws

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Communications in Computational Physics 2006年第3期1卷 548-574页

作者： Bruno Costa Wai Sun don David Gottlieb Radislav Sendersky Departamento de Matem´atica Aplicada IM-UFRJCaixa Postal 68530Rio de JaneiroRJC.E.P.21945-970Brazil Division of Applied Mathematics Brown UniversityProvidenceRhode Island 02912USA

The multi-domain hybrid Spectral-WENO method(Hybrid)is introduced for the numerical solution of two-dimensional nonlinear hyperbolic systems in a Cartesian physical domain which is partitioned into a grid of rectangular *** main idea of the Hybrid scheme is to conjugate the spectral and WENO methods for solving problems with shock or high gradients such that the scheme adapts its solver spatially and temporally depending on the smoothness of the solution in a given *** as a multi-domain method,an adaptive algorithm is used to keep the solutions parts exhibiting high gradients and discontinuities always inside WENO subdomains while the smooth parts of the solution are kept inside spectral ones,avoiding oscillations related to the well-known Gibbs phenomenon and increasing the numerical efficiency of the overall scheme.A higher order version of the multi-resolution analysis proposed by Harten is used to determine the smoothness of the solution in each *** also discuss interface conditions for the two-dimensional problem and the switching procedure between WENO and spectral *** Hybrid method is applied to the two-dimensional Shock-Vortex Interaction and the Richtmyer-Meshkov Instability(RMI)problems.

关键词： Spectral WENO multi-resolution multi-domain hybrid conservation laws

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Metachronous squamous cell carcinoma of pancreas and stomach in an elderly female patient:A case report

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World Journal of Clinical Cases 2021年第31期9卷 9680-9685页

作者： Ji Hyun Kim Chang don Kang Kyungyul Lee Kyu-Hyoung Lim Department of Internal Medicine Kangwon National University School of MedicineChuncheon 24341Kangwon DoSouth Korea Department of Pathology Kangwon National University School of MedicineChuncheon 24341Kangwon DoSouth Korea

BACKGROUND Squamous cell carcinoma(SCC)in pancreas and stomach is a rare histologic subtype with aggressive behavior,poor prognosis,and no standardized *** SCC or gastric SCC has been previously ***,case of SCC occurring in both the pancreas and the stomach has not been reported *** SUMMARY A 75-year-old female with prior history of hypertension and diabetes mellitus visited our hospital with complaint of abdominal pain that started three months *** tomography(CT)scan of the abdomen showed 3.3 cm mass at the distal *** received surgical resection which was histologically found to be SCC of the pancreas with clear resection *** she was discharged,she no longer visited the *** years later,she was referred to our hospital after showing abnormal findings on a gastroscopy performed at another *** revealed a single,2cm sized,ill-defined irregular flat and hyperemic mass at high *** finding of the mass was *** scan and positive emission tomography CT showed metastatic lesions to the liver and the *** received combination chemotherapy with capecitabine and ***,she passed away 6 mo after diagnosis of gastric *** To the best of our knowledge,this is the first case of metachronous SCC of stomach occurring after diagnosis of pancreatic SCC.

关键词： Squamous cell carcinoma Pancreas Stomach Metachronous Pancreatectomy Case report

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Lithofacies modeling by multipoint statistics and economic evaluation by NPV volume for the early Cretaceous Wabiskaw Member in Athabasca oilsands area, Canada

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Geoscience Frontiers 2018年第2期9卷 441-451页

作者： Kwang Hyun Kim Kyungbook Lee Hyun Suk Lee Chul Woo Rhee Hyun don Shin Petroleum and Marine Research Division Korea Institute of Geoscience and Mineral Resources Department of Earth and Environmental Sciences Chungbuk National University Department of Energy Resources Engineering Inha University

The static modeling and dynamic simulation are essential and critical processes in petroleum exploration and development. In this study, lithofacies models for Wabiskaw Member in Athabasca, Canada are generated by multipoint statistics(MPS) and then compared with the models built by sequential indicator simulation(SIS). Three training images(Tls) are selected from modern depositional environments;the Orinoco River Delta estuary, Cobequid bay-Salmon River estuary, and Danube River delta environment. In order to validate lithofacies models, average and variance of similarity in lithofacies are calculated through random and zonal blind-well *** random six-blind-well test, similarity average of MPS models is higher than that of SIS model. The Salmon MPS model closely resembles facies pattern of Wabiskaw Member in subsurface. Zonal blind-well tests show that successful lithofacies modeling for transitional depositional setting requires additional or proper zonation information on horizontal variation, vertical proportion, and secondary *** Wabiskaw Member is frontier oilsands lease, it is impossible to evaluate the economics from production data or dynamic simulation. In this study, a dynamic steam assisted gravity drainage(SAGD)performance indicator(SPIDER) on the basis of reservoir characteristics is calculated to build 3 D reservoir model for the evaluation of the SAGD feasibility in Wabiskaw Member. SPIDER depends on reservoir properties, economic limit of steam-oil ratio, and bitumen price. Reservoir properties like porosity,permeability, and water saturation are measured from 13 cores and calculated from 201 well-logs. Three dimensional volumes of reservoir properties are constructed mostly based on relationships among properties. Finally, net present value(NPV) volume can be built by equation relating NPV and SPIDER. The economic area exceeding criterion of US$ 10,000 is identified, and the ranges of reservoir properties are estimated. NPV-volume-generati

关键词： Oilsands Multipoint statistics (MPS) Reservoir static modeling Economic evaluation Net present value (NPV) SAGD, and SPIDER

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Application of direct laser metal tooling for AISI H13 tool stee

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中国有色金属学会会刊：英文版 2009年第B9期19卷 284-287页

作者： Jae-Ho LEE Jeong-Hwan JANG Byeong-don JOO Hong-Sup YIM Young-Hoon MOON School of Mechanical Engineering Pusan National University

In the die industry, it is commonly agreed that residual tool life can be successfully extended by timely repair of damaged surfaces. Traditionally, the main repair process is tungsten inert gas (TIG) welding, but a new process called direct laser metal tooling (DLMT) emerges. DLMT is a manual process, of which results depend on the materials of the powders and tools, the laser process and parameters. This technology is a direct-metal freeform fabrication technique in which a 200 W fiber laser is used. AISI H13 tool steel is a suitable material for die casting tools because of the high resistance to thermal fatigue and dimensional stability. In this research, AISI H13 tool steel was melted with metal powder by fiber laser. Before melting AISI H13, the powders were analyzed with XRF equipment. Then, hardness distribution of laser melted zone was investigated. The microstructure in laser melted zone was discussed. In order to identify the effect of particle size of powder on the melted zone, two types of particle sizes of powders were used. Experimental results show that the mold repair process using DLMT can be applied in the mold repair industry.

关键词：金属模具应用激光工具钢 H13 社会光纤激光器粉末材料修复过程

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Effect of Laser Parameters on Sintered Powder Morphology

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Journal of Materials Science & Technology 2010年第4期26卷 375-378页

作者： Byeong-don Joo Jeong-Hwan Jang Jae-Ho Lee Young-Myung Son Young-Hoon Moon Engineering Research Center for Net Shape and Die Manufacturing School of Mechanical EngineeringPusan National University

Selective laser sintering is a kind of rapid prototyping process whereby a three-dimensional part is built layerwise by laser scanning a powder. This process is highly inffuenced by powder and laser parameters such as laser power, scan rate, spot size and layer thickness. Therefore a study on fabricating a line with Fe-Ni-Cr powder on AISI H13 tool steel has been performed by selective laser sintering. In this study, fabrication was performed by experimental facilities consisting of a 200W fiber laser which can be focused to 0.08 mm and atmospheric chamber which can control atmospheric pressure with argon. The line was fabricated with various laser power, scan rate and layer thickness. Line width and surface quality were investigated. With power increase or layer thickness decrease, line width was decreased and line surface quality was improved with scan rate optimization.

关键词： Selective laser sintering Direct fabrication Fiber laser

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Classifying forest inventory data into species-based forest community types at broad extents： exploring tradeoffs among supervised and unsupervised approaches

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Forest Ecosystems 2018年第1期5卷 91-107页

作者： jennifer k.costanza don faber-langendoen john w.coulston david n.wear Department of Forestry and Environmental Resources North C arolina State University3041 Cornwalis RdResearch Triangle ParkRaleighNC 27709USA NatureServe 4600 N.Fairfax Dr7th FloorArlingtonVA 22203USA Southern Research Station USDA Forest ServiceBlacksburgVAUSA Southern Research Station USDA Forest ServiceRaleighNCUSA

Background： Knowledge of the different kinds of tree communities that currently exist can provide a baseline for assessing the ecological attributes of forests and monitoring future changes. Forest inventory data can facilitate the development of this baseline knowledge across broad extents, but they first must be classified into forest community types. Here, we compared three alternative classifications across the United States using data from over 117,000 U.S. Department of Agriculture Forest Service Forest Inventory and Analysis （FIA） plots. Methods： Each plot had three forest community type labels：（1）＂FIA＂ types were assigned by the FIA program using a supervised method; （2）＂USNVC＂ types were assigned via a key based on the U.S. National Vegetation Classification; （3）＂empirical＂ types resulted from unsupervised clustering of tree species information. We assessed the degree to which analog classes occurred among classifications, compared indicator species values, and used random forest models to determine how well the classifications could be predicted using environmental variables. Results： The classifications generated groups of classes that had broadly similar distributions, but often there was no one-to-one analog across the classifications. The Iongleaf pine forest community type stood out as the exception： it was the only class with strong analogs across all classifications. Analogs were most lacking for forest community types with species that occurred across a range of geographic and environmental conditions, such as Ioblolly pine types, indicator species metrics were generally high for the USNVC, suggesting that LJSNVC classes are floristically well-defined. The empirical classification was best predicted by environmental variables. The most important predictors differed slightly but were broadly similar across all classifications, and included slope, amount of forest in the surrounding landscape, average minimum temperature, and other climate variab

关键词： Big data Correspondence analysis Dominant species Forest communities Global change,Hierarchical classification Indicator species Random forests Species assemblages

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