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Defect-Detection Model for Underground Parking Lots Using Image Object-Detection Method

Computers, Materials & Continua 2021年第3期66卷 2493-2507页

作者： Hyun Kyu Shin Si Woon Lee goo pyo hong Lee Sael Sang Hyo Lee Ha Young Kim Architectural Engineering Hanyang UniversityERICAAnsan15588Korea Department of Artificial Intelligence Ajou UniversitySuwon16499Korea Division of Architecture and Civil Engineering Kangwon National UniversitySamcheok25913Korea Division of Smart Convergence Engineering Hanyang UniversityERICAAnsan15588Korea Graduate School of Information Yonsei UniversitySeoul03722Korea

The demand for defect diagnoses is gradually gaining ground owing to the growing necessity to implement safe inspection methods to ensure the durability and quality of ***,conventional manpower-based inspection methods not only incur considerable cost and time,but also cause frequent disputes regarding defects owing to poor ***,the demand for an effective and efficient defect-diagnosis model for concrete structures is imminent,as the reduction in maintenance costs is significant from a long-term ***,this paper proposes a deep learning-based image objectidentification method to detect the defects of paint peeling,leakage peeling,and leakage traces that mostly occur in underground parking lots made of concrete *** deep learning-based object-detection method can replace conventional visual inspection methods.A faster region-based convolutional neural network(R-CNN)model was used with a training dataset of 6,281 images that utilized a region proposal network to objectively localize the regions of interest and detect the surface *** defects were classified according to their type,and the learning of each exclusive model was ensured through test sets obtained from real underground parking *** a result,average precision scores of 37.76%,36.42%,and 61.29%were obtained for paint peeling,leakage peeling,and leakage trace defects,***,this study verified the performance of the faster RCNN-based defect-detection algorithm along with its applicability to underground parking lots.

关键词： Faster R-CNN deep learning defect detection concrete structures

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Characteristics of gastric cancer recurrence five or more years after curative gastrectomy

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Chinese Journal of Cancer Research 2016年第5期28卷 503-510页

作者： Chang-Hyun Shin Woo-Yong Lee Seung-Woo hong Yeo-goo Chang Department of Surgery Ilsan Paik HospitalInje University College of Medicine Department of Surgery Seoul Paik HospitalInje University College of Medicine

Objective： To investigate the characteristics of recurrences that occurred 5 or more years after curative resection for gastric ***： We analyzed recurrences among 1,299 patients with gastric cancer who underwent curative operations at the Department of Surgery, Inje University Seoul Paik Hospital between September 1998 and December 2002. Recurrences were classified as within 2 years （early）, 2-5 years （intermediate）, and more than 5 years （late） after gastrectomy. The clinicopathologic findings of the patients with late recurrence were compared with those of patients in the other two recurrence groups, with special reference to the patterns of recurrence. Both univariate and multivariate analyses were performed, incorporating factors such as operation type, T-stage, N-stage, stage, lymphatic invasion, neural invasion, histology, tumor size, and recurrence ***： At the time of last follow-up, recurrence occurred in 266 （20.5%） patients. Recurrence times were classified as 〈2 years （182 patients）, 2-5 years （61 patients）, or 〉5 years （23 patients）. The late recurrence rate was 8.6%. The occurrence of recurrence 〉5 years after gastrectomy was significantly correlated with age, operation type, T-stage, N-stage, stage, lymphatic invasion, neural invasion, histology, tumor size, location and recurrence site （P〈0.05）. The main recurrence patterns in the 23 patients with late recurrence were locoregional metastasis （10 patients, 43.5%）, peritoneal seeding （8 patients, 34.8%）, hematogenous metastasis （2 patients, 8.7%）, and multiple metastasis （3 patients, 13.0%）. A multivariate analysis showed that larger tumor size and younger age were independent prognostic factors for late recurrence. Additionally, locoregional and peritoneal recurrences were significantly more common than hematogenous recurrences. Conclusions： Although late recurrence was uncommon, younger age and larger tumor size were associated with high risk. Follow-up surveillance is recommended

关键词： Curative surgery gastric cancer gastrectomy late recurrence recurrence

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Automorphism groups of some algebras

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Science China Mathematics 2009年第2期52卷 323-328页

作者： PARK hong goo LEE Jeongsig CHOI Seul Hee NAM Ki-Bong Department of Mathematics Hanyang UniversitySeoul 133-791 Korea Department of General Studies and Education SamYuk University Cheongnyangi P.O.Box 118Seoul 130-650 Korea Department of Mathematics University of JeonjuChon-ju 560-759 Korea Department of Mathematics and Computer Sciences University of Wisconsin-WhitewaterWhitewater WI53190 USA

The automorphism groups of algebras are found in many papers. Using auto-invariance, we find the automorphism groups of the Laurent extension of the polynomial ring and the quantum n-plane (respectively, twisting polynomial ring) in this work. As an application of the results of this work, we can find the automorphism group of a twisting algebra. We define a generalized Weyl algebra and show that the generalized Weyl algebra is simple. We also find the automorphism group of a generalized Weyl algebra. We show that the generalized Weyl algebra Am,m+n is the universal enveloping algebra of the generalized Witt algebra W(m,m + n).

关键词： Laurent extension quantum n-plane (generalized) Weyl algebra automorphism auto-invariant 17B40 17B56

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Clinical analysis of patients with hepatocellular carcinoma recurrence after living-donor liver transplantation

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World Journal of Gastroenterology 2016年第25期22卷 5790-5799页

作者： Gun Hyung Na Tae Ho hong Young Kyoung You Dong goo Kim Department of Surgery Seoul St. Mary’s Hospital College of Medicine The Catholic University of Korea

AIM: To evaluated patterns and outcomes of hepatocellular carcinoma (HCC) recurrence after living donor liver transplantation (LDLT).METHODS: From 2001 to 2014, 293 patients underwent LDLT for HCC at our transplant center. We retrospectively reviewed 54 (18.4%) patients with HCC recurrence after LDLT. We evaluated patterns and outcomes of HCC recurrence after LDLT, with particular attention to the Milan criteria at transplantation, treatments for HCC-recurrent patients, and factors related to survival after HCC recurrence. Furthermore, we evaluated the efficacy of combination treatment of sorafenib and an mTOR ***: The 1-, 2-, and 3-year overall survival rates after HCC recurrence were 41.1%, 20.5%, and 15.4%, respectively. The median time interval between LDLT and HCC recurrence was 6.5 mo. Although recurrence rates according to the Milan criteria at LDLT were significantly different, HCC recurrence patterns and survival rates after HCC recurrence were not significantly different between the two groups. Time to recurrence < 12 mo (P = 0.048), multiple recurrences at HCC recurrence (P = 0.038), and palliative treatment for recurrent tumors (P = 0.003) were significant independent prognostic factors for poor survival after HCC recurrence in a multivariate analysis. The combination treatment of sorafenib and sirolimus showed survival benefits in the palliative treatment group (P = 0.005).CONCLUSION: Curative treatment for recurrent HCC after LDLT is the most important factor in survival rates after HCC recurrence and combination treatments of sorafenib and an mTOR inhibitor could have survival benefits in patients with HCC recurrence after LT in the palliative treatment group.

关键词： Hepatocellular carcinoma Living donor liver transplantation mTOR inhibitor Recurrence Selection criteria

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A Strategy of Signal Detection for Performance Improvement in Clipping Based OFDM System

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Computers, Materials & Continua 2020年第7期64卷 181-191页

作者： Jae-Hyun Ro Won-Seok Lee Min-goo Kang Dae-Ki hong Hyoung-Kyu Song Department of Information and Communication Engineering Sejong UniversitySeoulKorea Department of IT Contents Hanshin UniversityOsan-siKorea Department of System Semiconductor Engineering SangMyung UniversityCheonan-si31066Korea

In this paper,the supervised Deep Neural Network(DNN)based signal detection is analyzed for combating with nonlinear distortions efficiently and improving error performances in clipping based Orthogonal Frequency Division Multiplexing(OFDM)*** of the main disadvantages for the OFDM is the high Peak to Average Power Ratio(PAPR).The clipping is a simple method for the PAPR ***,an effect of the clipping is nonlinear distortion,and estimations for transmitting symbols are difficult despite a Maximum Likelihood(ML)detection at the *** DNN based online signal detection uses the offline learning model where all weights and biases at fully-connected layers are set to overcome nonlinear distortions by using training data ***,this paper introduces the required processes for the online signal detection and offline learning,and compares error performances with the ML detection in the clipping-based OFDM *** simulation results,the DNN based signal detection has better error performance than the conventional ML detection in multi-path fading wireless *** performance improvement is large as the complexity of system is increased such as huge Multiple Input Multiple Output(MIMO)system and high clipping rate.

关键词： Clipping DNN ML nonlinear distortion OFDM

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Middle cerebral artery occlusion methods in rat versus mouse model of transient focal cerebral ischemic stroke

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Neural Regeneration Research 2014年第7期9卷 757-758页

作者： Seunghoon Lee Minkyung Lee Yunkyung hong Jinyoung Won Youngjeon Lee Sung-goo Kang Kyu-Tae Chang Yonggeun hong Department of Rehabilitation Science Graduate School of Inje University Ubiquitous Healthcare & Anti-aging Research Center Inje University Cardiovascular & Metabolic Disease Center Inje University National Primate Research Center (NPRC) Korea Research Institute of Bioscience and Biotechnology (KRIBB) Ochang School of Biological Sciences College of Biomedical Science & Engineering Inje University Department of Physical Therapy Graduate School of Inje University

Experimental stroke research commonly employs focal cerebral ischemic rat models （Bederson et al., 1986a; Longa et al., 1989）. In human patients, ischemic stroke typically results from thrombotic or embolic occlusion of a major cerebral artery, usually the mid- dle cerebral artery （MCA）. Experimental focal cerebral ischemia models have been employed to mimic human stroke （Durukan and Tatlisumak, 2007）. Rodent models of focal cerebral ischemia that do not require craniotomy have been developed using intraluminal suture occlusion of the MCA （MCA occlusion, MCAO）（Rosamond et al., 2008）. Furthermore, mouse MCAO models have been wide- ly used and extended to genetic studies of cell death or recovery mechanisms （Liu and McCullough, 2011）. Genetically engineered mouse stroke models are particularly useful for evaluation of isch- emic pathophysiology and the design of new prophylactic, neuro- protective, and therapeutic agents and interventions （Armstead et al., 2010）. During the past two decades, MCAO surgical techniques have been developed that do not reveal surgical techniques for mouse MCAO model engineering. Therefore, we compared MCAO surgical methods in rats and mice.

关键词： MCAO CCA Middle cerebral artery occlusion methods in rat versus mouse model of transient focal cerebral ischemic stroke

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Clinical advantages of single port laparoscopic hepatectomy

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World Journal of Gastroenterology 2018年第3期24卷 379-386页

作者： Jae Hyun Han Young Kyoung You Ho Joong Choi Tae Ho hong Dong goo Kim Division of Hepatobiliary-Pancreas Surgery and Liver Transplantation Department of SurgerySeoul St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea

AIM To evaluate the clinical advantages of single-port laparoscopic hepatectomy(SPLH) compare to multiport laparoscopic hepatectomy(MPLH).METHODS We retrospectively reviewed the medical records of 246 patients who underwent laparoscopic liver resection between January 2008 and December 2015 at our hospital. We divided the surgical technique into two groups; SPLH and MPLH. We performed laparoscopic liver resection for both benign and malignant disease. Major hepatectomy such as right and left hepatectomy was also done with sufficient disease-free margin. The operative time, the volume of blood loss, transfusion rate, and the conversion rate to MPLH or open surgery was evaluated. The post-operative parameters included the meal start date after operation, the number of postoperative days spent in the hospital, and surgical complications was also *** Of the 246 patients, 155 patients underwent SPLH and 91 patients underwent MPLH. Conversion rate was 22.6% in SPLH and 19.8% in MPLH(P = 0.358). We performed major hepatectomy, which was defined as resection of more than 2 sections, in 13.5% of patients in the SPLH group and in 13.3% of patients in the MPLH group(P = 0.962). Mean operative timewas 136.9 ± 89.2 min in the SPLH group and 231.2 ± 149.7 min in the MPLH group(P < 0.001). The amount of blood loss was 385.1 ± 409.3 m L in the SPLH group and 559.9 ± 624.9 m L in the MPLH group(P = 0.016). The safety resection margin did not show a significant difference(0.84 ± 0.84 cm in SPLH vs 1.04 ± 1.22 cm in MPLH, P = 0.704). Enteral feeding was started earlier in the SPLH group(1.06 ± 0.27 d after operation) than in the MPLH group(1.63 ± 1.27 d)(P < 0.001). The mean hospital stay after operation was non-significantly shorter in the SPLH group than in the MPLH group(7.82 ± 2.79 d vs 7.97 ± 3.69 d, P = 0.744). The complication rate was not significantly different(P = 0.397) and there was no major perioperative complication or mortality case in both groups. CONCLUS

关键词： Hepatectomy Laparoscopy Minimally invasive surgery Treatment outcome Feasibility study

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The High Nitrogen Pressure Synthesis of Manganese Nitride

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Chinese Physics Letters 2012年第12期29卷 228-231页

作者： SI Ping-Zhan JIANG Wei WANG Hai-Xia Zhong Min GE hong-Liang CHOI Chul-Jin LEE Jung-goo School of Materials Science and Engineering China Jiliang UniversityHangzhou 3100182Korea Institute of Materials ScienceChangwonGyeongnam641-831R.Korea

We report on the structural transformation and unique magnetic properties of manganese nitrides prepared by nitriding Mn under N_(2) pressures of up to 25 MPa with varying *** N_(2) pressure not only makes nitridation more efficient at lower temperatures,but also enhances the N-content in the nitride lattices,which were expanded with increasing *** N-rich nitrides,includingε-Mn_(4)N,ζ-Mn6N_(2).58 andη-Mn_(3)N_(2),exhibit unique thermal *** N-richε-phase exhibits much larger coercivity and lower saturation magnetization in comparison with theε-phase prepared under ambient N_(2) *** coercivity of the N-richζ-phase reaches up to 45054 A/m.A saturation magnetization as large as 31 Am^(2)/kg is observed in the N-richη-*** are quite different from the conventional antiferromagneticζ-andη-phase obtained under ambient N_(2) *** ascribe the unconventional magnetic properties of the nitrides to the lattice distortion originating from the N-enrichment.

关键词： transformation magnetization saturation

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Comparative long-term outcomes for pancreatic volume change, nutritional status, and incidence of new-onset diabetes between pancreatogastrostomy and pancreatojejunostomy after pancreaticoduodenectomy

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Hepatobiliary Surgery and Nutrition 2020年第3期9卷 284-295页

作者： Bong Jun Kwak Ho Joong Choi Young Kyoung You Dong goo Kim Tae Ho hong Department of Hepatobiliary and Pancreas Surgery Seoul St. Mary's Hospital College of Medicine The Catholic University of Korea Seoul Republic of Korea

Background:The difference in volume change in a pancreatic remnant according to the type of pancreaticoenterostomy after pancreaticoduodenectomy(PD)for long-term follow-up is ***,there are few studies that evaluate the difference in general nutritional status and pancreatic endocrine function,including new-onset diabetes mellitus(NODM)depending on the type of *** study aimed to compare serial pancreatic volume changes in pancreatic remnants between pancreatogastrostomy(PG)and pancreatojejunostomy(PJ)after PD and to evaluate the difference in general nutritional status and incidence of NODM between PG and ***:This study enrolled 115 patients who had survived for more than 3 years after *** were divided into the PG group and the PJ *** clinicopathologic factors were collected and *** calculated serial pancreas volume and pancreatic duct size precisely from preoperative stage to 5 years after surgery by image-processing software specifically designed for navigation and visualization of multimodality and multidimensional *** changes of albumin and body mass index(BMI)as related to general nutritional status were compared between the PG and PJ *** evaluate the incidence and risk factors of NODM following PD,subgroup analysis was performed in 88 patients who did not have diabetes ***:Most patient demographics were not significantly different between the PG group(n=45)and PJ group(n=70).There was no significant difference in volume reduction between the groups from postoperative 1 month to 5 years(PG group?18.21±14.66 mL versus PJ group?14.43±13.05 mL,P=0.209).But there was a significant difference in increased pancreatic duct size between the groups from postoperative 1 month to 5 years(PG group 1.66±2.20 mm versus PJ group 0.54±1.54 mm,P=0.007).There was no significant difference in the increase of total serum albumin between the groups for 5 years after surgery(PG group 0

关键词： Pancreaticojejunostomy pancreaticoduodenectomy(PD) nutritional status diabetes mellitus

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Variation in Summer Surface Air Temperature over Northeast Asia and Its Associated Circulation Anomalies

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Advances in Atmospheric Sciences 2016年第1期33卷 1-9页

作者： Wei CHEN Xiaowei hong Riyu LU Aifen JIN Shizhu JIN Jae-Cheol NAM Jin-Ho SHIN Tae-Young goo Baek-Jo KIM State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 University of Chinese Academy of Sciences Beijing 100049 Department of Geography Yanbian University Yanji 133002 National Institute of Meteorological Research Korea Meteorological Administration deju Korea

This study investigates the interannual variation of summer surface air temperature over Northeast Asia（NEA） and its associated circulation *** leading modes for the temperature variability over NEA are obtained by EOF *** first EOF mode is characterized by a homogeneous temperature anomaly over NEA and therefore is called the NEA *** anomaly extends from southeast of Lake Baikal to Japan,with a central area in Northeast *** second EOF mode is characterized by a seesaw pattern,showing a contrasting distribution between East Asia（specifically including the Changbai Mountains in Northeast China,Korea,and Japan） and north of this *** mode is named the East Asia（EA） *** modes contribute equivalently to the temperature variability in *** two leading modes are associated with different circulation anomalies.A warm NEA mode is associated with a positive geopotential height anomaly over NEA and thus a weakened upper-tropospheric westerly *** the other hand,a warm EA mode is related to a positive height anomaly over EA and a northward displaced *** addition,the NEA mode tends to be related to the Eurasian teleconnection pattern,while the EA mode is associated with the East Asia-Pacific/PacificJapan pattern.

关键词： surface air temperature Northeast Asia East Asia circulation anomaly interannual variability

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