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Duong Trieu Trieu,An Huu Ho,Trinh Thi The Nguyen,Quoc Van Le 대한소화기학회 2023 대한소화기학회지 Vol.81 No.5
Gastrointestinal arteriovenous malformations (AVMs) are a rare disease. Sigmoid-anorectal AVM has only been reported in a few cases. The condition is usually detected when patients have gastrointestinal bleeding complications. The diagnosis and treatment of colorectal AVMs are still challenging. This paper presents a case of an Asian 32-year-old female patient admitted to hospital because of lower gastrointestinal bleeding lasting 17 years. The patient was diagnosed with sigmoid-rectal arteriovenous malformation and failed with other medical treatments. The damaged gastrointestinal tract was removed by a laparoscopic low anterior resection. The results were positive after a three-month follow-up; the bleeding was resolved, and the anal sphincter function was intact. Laparoscopic low anterior resection is a safe, less invasive, and effective approach for managing patients with digestive tract bleeding due to extensive colorectal AVM and preservation of the anal sphincter.
Nguyen, Van Trieu,Hwang, Seho,Jang, Seonghyung,Hoang, Ngoc Dong,Pham, Huy Giao Elsevier 2018 Marine and petroleum geology Vol.93 No.-
<P><B>Abstract</B></P> <P>Cuu Long Basin, which is located in southeast offshore Viet Nam, has a number of well fractured granitic basement reservoirs. Though dozens of wells have been drilled in the pre-Tertiary basement, the actual number of wells in which hydrocarbons were discovered is approximately 30% of the total. Therefore, understanding fracture characteristics in the fractured basement is very important and plays a critical role in designing the well path. This study proposes a method to optimize well path design in the fractured granitoid basement rock. Available information, including basin tectonic evolution, basin geological characteristics, seismic interpretation, and wireline logs, especially image and sonic logs, are analyzed in order to understand the fracture characteristics and the distribution of fractures in the study area, which is referred to as Thuy Trieu Do (TTD) structure. There are two key factors related to the flow in basement of TTD structure, namely are solution-enhanced fractures and faults interpreted from seismic images. Solution-enhanced fractures from images are considered to be open fractures that contribute to flow. Within the TTD basement, the solution-enhanced fractures trend in the east-west and sub east-west directions. Faults interpreted from seismic images are complex with different fault directions, having been active in several tectonic phases. They are evaluated and classified, then the faults those are NE-SW 60–70°, E-W, and sub E-W 80–280° have potential in creation fault-related fractures of solution-enhanced fracture type. Fractures are mostly distributed in fracture zones along the fault zone. By displaying faults and fractures together both along the well path and on rose diagrams, combined with production logs analysis, it appears that surrounding faults have increased fracture density and the presence of solution-enhanced fractures in every flow zone. The above relationships were taken in analyses for the next well design in the TTD structure. In this study, for optimal well path design in the fractured basement reservoir, a systematic procedure of interpretation of various geophysical data in Cuu Long Basin has been proposed, and this approach is expected to be applicable to other fractured reservoirs in Viet Nam.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Permeable fractures in granitoid basement are mostly distributed in fracture zones along faults. </LI> <LI> Solution-enhanced fractures are considered to be the main fracture for drainage. </LI> <LI> The proposed drilling well path should cut through faults and solution-enhanced fractures. </LI> </UL> </P>
Displacement measurement of floating model using PhotoModeler scanner program
Trieu, Thi-Hang,Han, Dongyeob 대한토목학회 2013 대한토목학회 학술대회 Vol.2013 No.10
Displacement measurement is particularly important in investigating and designing of floating architecture structures. In this paper, a methodology using close-range photogrammetry was conducted to determine the displacement of floating model. For this purpose, there has been a special focus on the application of PhotoModeler scanner program in tracking a 2D floating model carried out at the harbor experiment central in Chonnam national university. The observed results of floating model can be easily obtained by the proposed method. This study indicated that the close-range photogrammetry is an efficient method in floating structure and further purposes in general construction.
Investigation of processing parameters in micro-thermoforming of micro-structured polystyrene film
Trieu Khoa Nguyen,이봉기 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.12
In this study, a thermoforming process for manufacturing micro-structured polystyrene (PS) films is investigated to characterize the effects of significant processing parameters. The present micro-thermoforming process utilizes a mold core with five concave rectangular grooves (each of width 0.4–1.2 mm and a depth of 1 mm). Two types of PS films (thicknesses of 50 and 190 μm) are employed to examine the effect of film thickness. Three main processing parameters namely heating temperature, heating time, and mold core temperature are analyzed. The results show that as the width of the groove in the mold core decreases, the forming ratio (depth-to-width ratio of the thermoformed micro-feature) slightly reduces, consequently indicating poor thermoforming. Both thin and thick PS films exhibit similar forming results under favorable conditions. However, when the processing conditions are not suitably applied, the thick film shows the worst result. From the design of experiment analysis using a normalized forming ratio, the mold core temperature is found to be the most influential factor in the thermoforming process of manufacturing micro-structured PS films.
Numerical Investigation of Warpage in Insert Injection- Molded Lightweight Hybrid Products
Trieu Khoa Nguyen,이봉기,황철진 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.2
In this study, a numerical investigation of warpage found within insert injection-molded frame parts was carried out based on the Taguchi method in conjunction with a response surface methodology. An integrated mold frame unit was recently developed by integrating a conventional mold frame, metal reflector, and bezel together, to be used in a back light unit system of a liquid crystal display. Such an integrated plastic-metal hybrid part could be successfully manufactured through the insert injection molding process. However, minimization or even elimination of warpage, one of the severe defects found in injection-molded products, is required for reliable mass production. Therefore, a numerical analysis was performed to reveal the effects of the relevant processing parameters, showing that packing pressure played the most significant role, originated from temperature difference between corners of the final product. Furthermore, a double optimization process combining the Taguchi method and the response surface methodology was employed to determine accurate and optimal processing conditions. The results clearly verified that the current combination technique can overcome the Taguchi method’s limitation, resulted from a discrete optimization nature, and also effectively give more accurate optimum solutions without complicated algorithms and software.