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Journal of Bionic Engineering 2016年第2期13卷 261-270页

作者： Loan Thi Kim Au Hoang Vu Phan hoon Cheol park Department of Advanced Technology Fusion Konkuk University Seoul 143-701 South Korea

This paper provides a parametric study to obtain the optimal wing rotation angle for the generation of maximum transla- tional force in an insect-mimicking Flapping-Wing Micro Air Vehicle （FWMAV） during hovering. The blade element theory and momentum theory were combined to obtain the equation from which the translational aerodynamic force could be esti- mated. This equation was converted into a non-dimensional form, so that the effect of normalized parameters on the thrust coefficient could be analyzed. The research showed that the thrust coefficient for a given wing section depends on two factors, the rotation angle of the wing section and the ratio of the chord to the travel distance of the wing section in one flapping cycle. For each ratio that we investigated, we could arrive at an optimal rotation angle corresponding to a maximum thrust coefficient. This study may be able to provide guidance for the FWMAV design.

关键词： FWMAV optimal rotation angle parametric study blade element theory momentum theory

Complication after nipple-areolar complex tattooing performed by a non-medical person:A case report

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World Journal of Clinical Cases 2022年第34期10卷 12781-12786页

作者： Je Yeon Byeon tae hoon Kim Hwan-Jun Choi Plastic and Reconstructive Surgery Soonchunhyang University HospitalCheonan KS002South Korea

BACKGROUND Compared to earlier,there has been an increase in the tattoo procedures for cosmetic purposes;and there has also been an increase in the tattoo procedures performed by non-medical *** South Korea,only tattoos performed by a doctor are considered legal;however,there is still some debate over whether tattoo procedures performed by non-healthcare providers should be considered *** SUMMARY A 28-year-old woman visited our hospital with pain in both nipples and heat sensation over the last 4 *** had a history of a nipple tattoo performed by an unlicensed *** bleeding was noted in both areolar areas,and the exudate mixed with pus and orange color ink was *** medication and tulle with foam dressing were performed under the impression of cellulitis and allergic *** 4 wk,nipples remained dark brown in color,resulting in a color mismatch between the nipple and orange-colored *** size of the areola was also found to be distinctly asymmetrical after *** complication may have been caused by the use of illegal ink or unsanitary procedures,or a problem may have occurred in the post-tattoo management *** Doctors use approved ink,aseptic procedure and appropriate postoperative care,and appropriate management can be performed in case of complications.

关键词： Infections Nipples Tattooing Licensure Case report

Longitudinal Flight Dynamic Analysis on Vertical Takeoff of a Tailless Flapping-Wing Micro Air Vehicle

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Journal of Bionic Engineering 2018年第2期15卷 283-297页

作者： Loan Thi Kim Au Vu Hoang Phan hoon Cheol park Department of Advanced Technology Fusion and Artificial Muscle Research Center Konkuk University Seou105029 Korea

This paper first analyzed the longitudinal dynamic behavior during vertical takeoff without control of a Flapping-Wing Micro Air Vehicle （FW-MAV）. The standard linear flight dynamics based on small disturbances from trim condition was not applicable for our analysis because the initial flight condition, which was at rest on the ground, could be such a large disturbance from the trim condition that the linearization is invalid. Therefore, we derived linearized Equations of Motion （EoM） which can treat an untrimmed flight condition as a reference for disturbances. The Computational Fluid Dynamic （CFD） software ANSYS Fluent was used to compute the aerodynamic forces and pitching moments. Three flight modes were found： a fast subsidence mode, a slow subsidence mode and a divergence oscil- latory mode. Due to divergence oscillatory mode, the deviation from the reference flight grew with time; the FW-MAV tumbled without control. The simulation showed for the first 0.5 second after leaving the ground （the time that is long enough for delay of feedback control）, the FW-MAV flew up to a height of 6 cm with small horizontal and pitching motion, which is close to a vertical flight.

关键词： bioinspired FW-MAV flight dynamics vertical takeoff CFD linear theory

Use of rotational atherectomy for reducing significant dissection in treating de novo femoropopliteal steno-occlusive disease after balloon angioplasty

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Journal of Geriatric Cardiology 2018年第4期15卷 254-260页

作者： tae-hoon Kim Manny Katsetos Khagendra Dahal Michael Azrin Juyong Lee University of Connecticut Health Center Connecticut USA Sejong General Hospital Bucheon South Korea Louisiana State University Health Science Center Shreveport LA USA

Background Development of arterial dissection is thought to be an important key factor for bailout stenting in femoropopliteal disease. We aimed to evaluate the difference in dissection rate and outcomes between the treatment group with rotational atherectomy and with？out it. Methods From January 2011 to October 2016, we compared the angiography after balloon angioplasty （BA） of de-novo, femoropop？liteal, steno-occlusive lesions whether they were treated by rotational atherectomy prior to the BA or not. Fifty-nine lesions （8 occlusions; 3 involving popliteal segment; lesion length： 86.3 ± 66.8 mm） in 44 patients （29 males; mean age 66.9 ± 9.7 years） were enrolled for this review. Results Forty-two lesions were treated using rotational atherectomy, prior to BA while 17 were recanalized firstly by BA. Clinical and lesion characteristics were not different between the groups. However, the rate of significant arterial dissection （type C to F） was lower in the atherectomy group （88.2% vs. 42.9%; P = 0.001）. In multivariate analysis, use of the atherectomy device was the only risk factor for prevention of development of significant dissection （P = 0.013; OR = 0.12; 95% CI： 0.025？0.642）. Patients were treated either by the angioplasty alone, drug coated balloon or stent insertion. There was lower trend in target vessel revascularization and primary patency toward the atherectomy group （low rank P = 0.108 and 0.166）, however secondary patency was significantly better （low rank P = 0.001）. Conclusions Rotational atherec？tomy before BA reduced the rate of significant dissection and therefore, might be a valuable option for minimizing need of bailout stenting.

关键词： Arterial dissection Atherectomy Femoropopliteal disease Peripheral arterial disease

Modular Timing Constraints for Delay-Insensitive Systems

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Journal of Computer Science & Technology 2016年第1期31卷 77-106页

作者： hoon park Anping He Marly Roncken Xiaoyu Song Ivan Sutherland Asynchronous Research Center Portland State University Portland OR 97201 U.S.A. Department of Electrical and Computer Engineering Portland State University Portland OR 97201 U.S.A. School of Information Science and Engineering Lanzhou University Lanzhou 730000 China

This paper introduces ARCtimer, a framework for modeling, generating, verifying, and enforcing timing constraints for individual self-timed handshake components. The constraints guarantee that the component＇s gate-level circuit implementation obeys the component＇s handshake protocol specification. Because the handshake protocols are delayinsensitive, self-timed systems built using ARCtimer-verified components are also delay-insensitive. By carefully considering time locally, we can ignore time globally. ARCtimer comes early in the design process as part of building a library of verified components for later system use. The library also stores static timing analysis （STA） code to validate and enforce the component＇s constraints in any self-timed system built using the library. The library descriptions of a handshake component＇s circuit, protocol, timing constraints, and STA code are robust to circuit modifications applied later in the design process by technology mapping or layout tools. In addition to presenting new work and discussing related work, this paper identifies critical choices and explains what modular timing verification entails and how it works.

关键词： self-timed circuit delay-insensitive system model checking timing analysis design pattern

Diagnostic evaluation of endoscopic ultrasonography with submucosal saline injection for differentiating between T1a and T1b early gastric cancer

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World Journal of Gastroenterology 2022年第46期28卷 6564-6572页

作者： Ji Young park tae Joo Jeon Department of Internal Medicine Inje University College of MedicineSanggye Paik HospitalSeoul 01757South Korea Department of Internal Medicine Yonsei University College of MedicineSeoul 03722South Korea

BACKGROUND Endoscopic ultrasonography(EUS)has become a reliable method for predicting the invasion depth of early gastric cancer(EGC).However,diagnostic accuracy of EUS is affected by several *** particular,it is difficult to differentiate between T1a and T1b EGC through *** To confirm whether submucosal saline injection(SSI)could improve the accuracy of EUS in distinguishing T1a and T1b lesions in *** Twenty-four patients with EGC were examined by EUS and subsequently by SSI combined EUS to compare the degree of tumor ***,they underwent endoscopic or surgical resection within 7 *** diagnostic accuracy of EUS and SSI combined EUS was evaluated based on the final pathological findings *** injected into the submucosa acted as an echoic contrast enhancing agent and had the effect of distinguishing the mucosal and submucosal layers *** Of total 24 patients,23 were diagnosed with EGC(T1 cancer:13 as T1a,and 10 as T1b).Standard EUS identified 6 of 13 T1a cancer patients and 3 of 10 T1b cancer ***,EUS-SSI identified 12 of 13 T1a cancer patients and 6 of 10 T1b cancer *** this study,SSI combined EUS was more accurate than EUS alone in diagnosing T1a and T1b lesions of EGC(75.0%and 37.5%,respectively).CONCLUSION SSI improved the diagnostic accuracy of EUS in distinguishing between the T1a and T1b stages in EGC.

关键词： Endoscopic ultrasonography Gastric cancer Endoscopy Surgery

Microstructural characteristics of AZ31 alloys rolled at room and cryogenic temperatures and their variation during annealing

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Journal of Magnesium and Alloys 2020年第2期8卷 537-545页

作者： Sang Won Lee Sang-hoon Kim Sung Hyuk park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

This study investigates the microstructural characteristics of AZ31 Mg alloys rolled at room temperature(RT)and cryogenic temperature(CT)and the variation in their microstructure and hardness during subsequent *** induces the formation of more side cracks than does RT rolling,because of the reduction in the ability of the material to accommodate deformation at ***{10-11}contraction and{10-11}-{10-12}double twins are formed in both the material rolled at RT and that rolled at CT,because the grains of the initial material are favorably oriented for{10-11}twinning under *** RT-rolled material has a higher dislocation density than the cryorolled material,and more twins are uniformly distributed throughout the former *** a result,static recrystallization during subsequent annealing is more pronounced in the RT-rolled material,which results in the formation of a highly recrystallized homogeneous microstructure after *** contrast,the formed twins are predominantly present along the shear bands in the cryorolled material,as a result of which this material has an inhomogeneous bi modal structure containing a large amount of coarse unrecrystallized grains after *** hardness of the annealed RT-rolled material is higher than that of the annealed cryorolled material owing to the finer grain structure of the former.

关键词： Magnesium Rolling Cryogenic temperature Annealing Microstructure

Progress of Materials and Devices for Neuromorphic Vision Sensors

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Nano-Micro Letters 2022年第12期14卷 239-271页

作者： Sung Woon Cho Chanho Jo Yong-hoon Kim Sung Kyu park Department of Electrical and Electronics Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Advanced Components and Materials Engineering Sunchon National UniversitySunchŏnJeonnam 57922Republic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwon 16419Republic of Korea

The latest developments in bio-inspired neuromorphic vision sensors can be summarized in 3 keywords:smaller,faster,and smarter.(1)Smaller:Devices are becoming more compact by integrating previously separated components such as sensors,memory,and processing *** a prime example,the transition from traditional sensory vision computing to in-sensor vision computing has shown clear benefits,such as simpler circuitry,lower power consumption,and less data redundancy.(2)Swifter:Owing to the nature of physics,smaller and more integrated devices can detect,process,and react to input more *** addition,the methods for sensing and processing optical information using various materials(such as oxide semiconductors)are evolving.(3)Smarter:Owing to these two main research directions,we can expect advanced applications such as adaptive vision sensors,collision sensors,and nociceptive *** review mainly focuses on the recent progress,working mechanisms,image pre-processing techniques,and advanced features of two types of neuromorphic vision sensors based on near-sensor and in-sensor vision computing methodologies.

关键词： In-sensor computing Near-sensor computing Neuromorphic vision sensor Optoelectronic synaptic circuit Optoelectronic synapse

Clinical significance of the neutrophil-lymphocyte ratio as an early predictive marker for adverse outcomes in patients with acute pancreatitis

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World Journal of Gastroenterology 2017年第21期23卷 3883-3889页

作者： tae Joo Jeon Ji Young park Division of Gastroenterology Department of Internal Medicine Inje University College of Medicine Sanggye Paik Hospital

AIM To investigated the prognostic value of the neutrophillymphocyte ratio(NLR) in patients with acute pancreatitis and determined an optimal cut-off value for the prediction of adverse outcomes in these *** We retrospectively analyzed 490 patients with acute pancreatitis diagnosed between March 2007 and December 2012. NLRs were calculated at admission and 24, 48, and 72 h after admission. Patients were grouped according to acute pancreatitis severity and organ failure occurrence, and a comparative analysis was performed to compare the NLR between groups. RESULTS Among the 490 patients, 70 had severe acute pancreatitis with 31 experiencing organ failure. The severe acute pancreatitis group had a significantly higher NLR than the mild acute pancreatitis group on all 4 d(median, 6.14, 6.71, 5.70, and 4.00 vs 4.74, 4.47, 3.20, and 3.30, respectively, P < 0.05). The organ failure group had a significantly higher NLR than the group without organ failure on all 4 d(median, 7.09, 6.72, 6.27, and 6.24 vs 4.85, 4.49, 3.35, and 2.34, respectively, P < 0.05). The optimal cut-off value for baseline NLR was 4.76 in predicting severity and 4.88in predicting organ failure in acute pancreatitis. CONCLUSION Elevated baseline NLR correlates with severe acute pancreatitis and organ failure.

关键词： Acute pancreatitis Neutrophil-lymphocyte ratio Organ failure Severe acute pancreatitis

Anti-integrin therapy for inflammatory bowel disease

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World Journal of Gastroenterology 2018年第17期24卷 1868-1880页

作者： Sung Chul park Yoon tae Jeen Division of Gastroenterology and Hepatology Department of Internal Medicine Kangwon National University School of Medicine Division of Gastroenterology and Hepatology Department of Internal Medicine Korea University Anam Hospital orea University College of Medicine

In inflammatory bowel disease(IBD), tumor necro-sis factor plays an important role in mediating infla-mmation, but several other pathways are also involved in eliciting an inflammatory response. One such pathway is the invasion of the intestinal mucosa by leukocytes. Leukocytes within the systemic circulation move to sites of inflammation, and blocking this pathway could be an important treatment strategy for IBD. Anti-integrin therapy blocks the action of integrin on the surface of circulating immune cells and endothelial cell adhesion molecules, thereby inhibiting the interactions between leukocytes and intestinal blood vessels. Natalizumab, which acts on α4-integrin, was the first such drug to be approved for Crohn's disease, but its use is limited due to the risk of progressive multifocal leukoencephalopathy. Vedolizumab produces few systemic adverse effects because it acts on gut-trophic α4β7 integrin, and has been approved and is being used to treat IBD. Currently, several anti-integrin drugs, including etrolizumab, which acts on β7-integrin, and PF-00547569, which targets mucosal addressin cell adhesion molecule-1, are undergoing clinical trials and the results are being closely watched.

关键词： Integrin Ulcerative colitis Crohn’s disease Natalizumab Abrilumab Etrolizumab PF-00547659 Inflammatory bowel disease AJM300 Vedolizumab