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Photonic structures in radiative cooling

Light(Science & Applications) 2023年第7期12卷 1187-1215页

作者： Minjae Lee Gwansik kim Yeongju Jung Kyung Rok Pyun Jinwoo Lee byung-wook kim Seung Hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Electronic Device Research Team Hyundai Motor Group37Cheoldobangmulgwan-roUiwang-siGyeonggi-do 16082South Korea E-drive Materials Research Team Hyundai Motor Group37Cheoldobangmulgwan-roUiwang-siGyeonggi-do 16082South Korea Department of Mechanical Robotics and Energy EngineeringDongguk University30 pildong-ro 1-gilJung-guSeoul 04620South Korea. Department of Civil Engineering and Engineering Mechanics Columbia UniversityNew YorkNY 10027USA. Institute of Advanced Machinery and Design(SNU-IAMD)/lnstitute of Engineering Research Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea

Radiative cooling is a passive cooling technology without any energy consumption,compared to conventional cooling technologies that require power sources and dump waste heat into the *** decades,many radiative cooling studies have been introduced but its applications are mostly restricted to nighttime use ***,the emergence of photonic technologies to achieves daytime radiative cooling overcome the performance *** example,broadband and selective emissions in mid-IR and high reflectance in the solar spectral range have already been *** review article discusses the fundamentals of thermodynamic heat transfer that motivates radiative *** photonic structures such as multilayer,periodical,random;derived from nature,and associated design procedures were thoroughly *** integration with new functionality significantly enhances the effciency of radiative cooling technologies such as colored,transparent,and switchable radiative cooling applications has been *** commercial applications such as reducing cooling loads in vehicles,increasing the power generation of solar cells,generating electricity,saving water,and personal thermal regulation are also ***,perspectives on radiative cooling and emerging issues with potential solution strategies are discussed.

关键词： radiative overcome transparent

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Vehicle Positioning Based on Optical Camera Communication in V2I Environments

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Computers, Materials & Continua 2022年第8期72卷 2927-2945页

作者： Pankaj Singh Huijin Jeon Sookeun Yun byung wook kim Sung-Yoon Jung Department of Electronic Engineering Yeungnam UniversityGyeongsan38541Korea HD Map Development Team Hyundai Autoever Co.Ltd.Seoul06171Korea Department of Information and Communication Engineering Changwon National UniversityChangwon51140Korea

Demand for precise vehicle positioning(VP)increases as autonomous vehicles have recently been drawing *** paper proposes a scheme for positioning vehicles on the move based on optical camera communication(OCC)technology in the vehicle-to-infrastructure(V2I)***-emitting diode(LED)streetlights and vehicle cameras are used as transmitters and receivers *** of streetlights are detected and traced by examining images that are obtained from cameras of ***,a scheme for analyzing visible light data extracted from the images is *** proposed vehicle positioning scheme uses information on angles between vectors that are formed under the collinearity conditions between the absolute coordinates of at least three received streetlights,and the coordinates of an image *** experiments are performed under stationary state and moving state at a speed of 5 and 20 km/*** verify the reliability of the proposed scheme,a comparison is made between the actual and estimated location of the camera in the stationary *** addition,the path of a moving vehicle and the estimated path of the vehicle are compared to check the performance of the *** performance of the proposed technique is analyzed and experimental demonstration confirms that the proposed OCC-based VP scheme achieves positioning accuracy of under 1 m.

关键词： Optical camera communication vehicle-to-infrastructure LED streetlight intelligent transport system vehicle positioning collinearity

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Grasper type scissors for endoscopic submucosal dissection of gastric epithelial neoplasia

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World Journal of Gastroenterology 2013年第37期19卷 6221-6227页

作者： Woo-Chul Chung byung-wook kim Chul-Hyun Lim Tae-Ho kim Jae-Myung Park Joon-Sung kim Division of Gastroenterology Department of Internal MedicineSuwon St.Vincent’s HospitalThe Catholic University of Korea Division of Gastroenterology Department of Internal MedicineIncheon St.Mary’s HospitalThe Catholic University of Korea Division of Gastroenterology Department of Internal MedicineSeoul St.Mary’s HospitalThe Catholic University of Korea Division of Gastroenterology Department of Internal MedicineBucheon St.Mary’s HospitalThe Catholic University of Korea

AIM:To evaluate the efficacy and safety of grasper type scissors(GTS)for endoscopic submucosal dissection(ESD)of gastric epithelial ***:The study was performed by 4 endoscopists in 4 institutions affiliated to The Catholic University of *** was performed in 76 consecutive patients with gastric epithelial neoplasia by using the GTS(37 patients)or the hook knife plus coagrasper(HKC)(39 patients).The complete resection rate,complication rate,total time elapsed and elapsed time per square centimeter of the dissected specimen were analyzed between the GTS and HKC ***:The mean age of the GTS group was 62.3±11.4 years and mean age of the HKC group was 65.6±10.1 *** adenocarcinoma was found in32.4%in the GTS group and 33.3%in the HKC *** procedures were performed without interruption in every case in both *** en bloc resection rates of both groups were 100%.The total time elapsed during the procedure was 44.54±21.72 min in the GTS group and 43.77±21.84 min in the HKC group(P=0.88)and the time elapsed per square centimeter of the resected lesion was 7.53±6.35 min/cm2in the GTS group and 6.92±5.93 min/cm2in the HKC group(P=0.66).The overall complication rate was not significantly different between the two ***:GTS is a safe and effective device for ESD compared with *** can be performed with GTS alone,which can reduce the costs for ESD.

关键词： Gastric epithelial neoplasia Endoscopic submucosal dissection Grasper type scissors Hook knife Coagrasper

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Prolapse gastropathy syndrome may be a predictor of pathologic acid reflux

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World Journal of Gastroenterology 2008年第36期14卷 5601-5605页

作者： Jin-Soo kim Hyung-Keun kim Young-Seok Cho Hiun-Suk Chae byung-wook kim Jin-Il kim Sok-Won Han Kyu-Yong Choi Department of Internal Medicine College of Medicine The Catholic University of Korea Uijeongbu St. Mary's Hospital Gyeonggi-do 480-717 South Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Uijeongbu St. Mary’s Hospital Gyeonggi-do 480-717 South Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Our Lady of Mercy Hospital Gyeonggi-do 403-720 South Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Yeoeuido St. Mary’s Hospital Seoul 150-713 South Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Holy Family Hospital Gyeonggi-do 420-717 South Korea

AIM： To assess the occurrence of gastric acid reflux into the esophagus in endoscopically confirmed prolapse gastropathy syndrome （PGS）. METHODS： Using ambulatory esophageal pH measurement （BRAVOTM wireless esophageal pH monitoring system）, twenty-six patients with PGS were compared with twenty-one patients with erosive esophagitis （EE） as controls. We assessed several reflux parameters, including the percentage of total time at pH 〈 4, and the DeMeester score. RESULTS： There were no statistical differences between the PGS group and the EE group as to mean age, sex ratio and pH recording time. The EE group showed more severe reflux than the PGS group, as evaluated in terms of the longest duration of reflux, the number of reflux episodes, the number of reflux episodes lasting 〉 5 min, the total time with pH 〈 4 during acid reflux episodes, and the DeMeester score, but none of these parameters showed statistically significant difference. Although 53.8% （14/26） of the PGS group and 76.2% （16/22） of the EE group demonstrated pathologic acid reflux （DeMeester score 〉 14.72）, there was no statistically significant difference between the two groups in the incidence of pathologic acid reflux （P = 0.11）. CONCLUSION： There was no statistically significant difference in pathologic acid reflux between the PGS and EE group. These data suggest that endoscopically diagnosed PGS might be a predictor of pathologic acid reflux.

关键词： Prolapse gastropathy syndrome Pathologic acid reflux Erosive esophagitis Ambulatory esophageal pH monitoring Retching

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Extraction and clipping repair of a chicken bone penetrating the gastric wall

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World Journal of Gastroenterology 2008年第12期14卷 1955-1957页

作者： Jin-Soo kim Hyung-Keun kim Young-Seok Cho Hiun-Suk Chae Chang-Whan kim byung-wook kim Sok-Won Han Kyu-Yong Choi Department of Internal Medicine College of Medicine The Catholic University of Korea Uijeongbu St. Mary's Hospital Gyeonggi-do 480-717 Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Holy Family Hospital Gyeonggi-do 420-717 Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Our lady of Mercy Hospital Gyeonggi-do 420-717 Korea

We report a case of gastric penetration caused by accidental ingestion of a chicken bone in a 42-year old woman with a partially wearing denture. Three days ago, she accidentally swallowed several lumps of poorly-chewed chicken. Physical examination disclosed mild tenderness in the periumbilical area. Abdominal Computed tomography (CT) showed a suspicious penetration or perforation of the stomach wall measuring about 3 cm, by a linear radiopaque material at the lesser curvature of the antrum. The end of a chicken bone was very close to but did not penetrate the liver. Endoscopic examination revealed a chicken bone that penetrated into the prepyloric antrum. The penetrating chicken bone was removed with grasping forceps. Five endoscopic clips were applied immediately at the removal site and the periumbilical pain resolved promptly. After removal of the chicken bone, the patient was treated with conservative care for three days, after which she was completely asymptomatic and discharged without complication. To treat gastric penetration by a foreign body, endoclipping can be a useful method in patients with no signs or symptoms of peritoneal irritation.

关键词： Gastric penetration Chicken bone Hemoclip

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Endoscopic band ligation and endoscopic hemoclip placement for patients with Mallory-Weiss syndrome and active bleeding

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World Journal of Gastroenterology 2008年第13期14卷 2080-2084页

作者： Young-Seok Cho Hiun-Suk Chae Hyung-Keun kim Jin-Soo kim byung-wook kim Sung-Soo kim Sok-Won Han Kyu-Yong Choi Department of Internal Medicine Uijeongbu St. Mary's Hospital The Catholic University of Korea Ujeongbu 480-717 Korea Department of Internal Medicine Our Lady Mercy Hospital The Catholic University of Korea Bupyeong 403720 Korea Department of Internal Medicine Uijeongbu St. Mary’s Hospital The Catholic University of Korea Ujeongbu 480-717 Korea Department of Internal Medicine Holy Family Hospital The Catholic University of Korea Bucheon 420717 Korea

AIM: To compare the hemostatic efficacy and safety of two mechanical endoscopic methods: endoscopic band ligation (EBL) and endoscopic hemoclip placement (EHP) in patients with actively bleeding Mallory-Weiss syndrome (MWS). METHODS: A prospective randomized study to compare the efficacy and safety of EHP with EBL was performed from January 2002 to August 2005. Forty-one patients with active bleeding from MWS were treated with EHP (n = 21) or EBL (n = 20). RESULTS: There were no significant differences between groups with respect to clinical and endoscopic characteristics. The mean number of hemoclips applied was 3.2 ± 1.5 and the mean number of bands applied was 1.2 ± 0.4. Primary hemostasis was achieved in all patients. Recurrent bleeding was observed in one patient from the EHP group and two from the EBL group. Patients with recurrent bleeding were treated by the same modality as at randomization and secondary hemostasis was achieved in all. There were no significant differences between the two groups in total transfusion amount or duration of hospital stay. No complications or bleeding-related death resulted. CONCLUSION: EHP and EBL are equally effective and safe for the management of active bleeding in patients with Mallory-Weiss syndrome, even in those with shock or comorbid diseases.

关键词： Mallory-Weiss syndrome Hemostasis Endoscopic band ligation Endoscopic clipping

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A squamous metaplasia in a gastric ulcer scar of the antrum

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World Journal of Gastroenterology 2008年第8期14卷 1296-1298页

作者： Young-Seok Cho Jin-Soo kim Hyung-Keun kim Jeong-Seon Ji byung-wook kim Hiun-Suk Chae Sok-Won Han Kyu-Yong Choi In-Sik Chung Department of Internal Medicine College of Medicine The Catholic University of Korea Uijeongbu St. Mary's Hospital Gyeonggi-do 480-717 Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Our Lady of Mercy Hospital Gyeonggi-do Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Holy Family Hospital Gyeonggi-do Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Kangnam St. Mary’s Hospital Seoul Korea

An 81-year-old man presented with epigastric pain and weight loss for one month. He had a past history of pulmonary tuberculosis, 10 years ago. We performed a gastroscopy, which showed a linear depressed whitish gastric ulcer scar (0.8 cm in length) in the posterior wall of the prepyloric antrum. The result of biopsy was reported as squamous epithelium. Immunohistochemical staining using an antibody to high molecular weight cytokeratin (HMC) revealed positive staining in the squamous epithelium. Two years later, the lesion was followed up. The lesion remained at same site endoscopically, but no squamous epithelium could be seen microscopically.

关键词： Squamous metaplasia Gastric ulcer scar High molecular weight cytokeratin

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Dual-priming oligonucleotide-based multiplex PCR using tissue samples in rapid urease test in the detection of Helicobacter pylori infection

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World Journal of Gastroenterology 2014年第21期20卷 6547-6553页

作者： Woo Chul Chung Sung Hoon Jung Jung Hwan Oh Tae Ho kim Dae Young Cheung byung wook kim Sung Soo kim Jin Il kim Eun Young Sin Department of Internal Medicine the Catholic University of KoreaSeoul 130-709South Korea The Research Institute of St. Vincent Hospital the Catholic University of KoreaSuwon 442-723South Korea

AIM: To investigate whether tissue samples processed by the rapid urease test (RUT) kit are suitable for dual-priming oligonucleotide-based multiplex polymerase chain reaction (DPO-PCR) to detect Helicobacter pylori (... 详细信息

关键词： Helicobacter pylori Diagnosis Dual-priming oligonucleotide-based multiplex polymerase chain reaction

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Concomitant therapy achieved the best eradication rate for Helicobacter pylori among various treatment strategies

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World Journal of Gastroenterology 2015年第1期21卷 351-359页

作者： Hyun Jeong Lee Jin Il kim Jin Soo Lee Eun Jung Jun Jung-Hwan Oh Dae Young Cheung Woo Chul Chung byung-wook kim Sung Soo kim Division of Gastroenterology Department of Internal MedicineCollege of MedicineThe Catholic University of KoreaSeoul 150-713South Korea

AIM: To compare the Helicobacter pylori(***) eradication rate of clarithromycin-based triple therapy,metronidazole-based triple therapy,sequential therapy and concomitant ***: A total of 680 patients infected with *** were divided into 4 groups and each group was treated with a different eradication ***-based triple therapy was applied to the first group [rabeprazole,amoxicillin and clarithromycin(PAC) group: proton pump inhibitor(PPI),amoxicillin,clarithromycin],whereas the second group was treated with metronidazole-based triple therapy [rabeprazole,amoxicillin and metronidazole(PAM) group: PPI,amoxicillin,metronidazole].The third group was treated with rabeprazole and amoxicillin,followed by rabeprazole,clarithromycin and metronidazole(sequential group).The final group was simultaneously treated with rabeprazole,amoxicillin clarithromycin and metronidazole(concomitant therapy group).In the case of a failure to eradicate ***,second-line quadruple and third-line eradication therapies were ***: The per protocol(PP) analysis was performed on 143,139,141 and 143 patients in the PAC,PAM,sequential and concomitant groups,*** excluded patients who did not receive a C13-urea breath test(22,20,23 and 22 patients,respectively) and patients with less than an 80% compliance level(5,11,6 and 5 patients,respectively).The eradication rates were 76.2%(109/143) in the PAC group,84.2%(117/139) in the PAM group,84.4%(119/141) in the sequential group and 94.4%(135/143) in the concomitant group(P = 0.0002).All 14 patients who failed second-line therapy were treated with thirdline eradication *** these 14 patients,6 infections were successfully eradicated with the thirdline *** PP and intention-to-treat analysis showed an eradication rate of 42.9%(6/14).In the PAC group,3 of 4 patients were successfully cured(3/4,75%); 2 of 2 patients in the PAM group(2/2,100%) and 1 of 5 patients in the seque

关键词： Helicobacter pylori Eradication Drug resistance Co

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Fabrication of SiC_p/AA5083 composite via friction stir welding

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中国有色金属学会会刊：英文版 2012年第S3期22卷 634-638页

作者： byung-wook AHN Don-Hyun CHOI Yong-Hwan kim Seung-Boo JUNG School of Advanced Materials Science and Engineering Sungkyunkwan University

Microstructure and mechanical properties of SiCp /AA5083 composite fabricated by friction stir welding (FSW) were *** influence of the number of FSW passes on the distribution of SiC particles and mechanical properties in the joint was *** one pass,the SiC particles were entangled in the upper side of the stir zone (SZ).However,the particle distribution became more uniform after two passes due to the repeated stirring of the *** the SiC particles facilitate the grain refinement in the SZ by the pinning effect,the particle including region has much smaller grain size than the SZ without SiC *** SiCp /AA5083 composite region exhibits a Vickers hardness of HV90,which is much higher than the value of HV80 in the SZ produced by FSW without SiC particles.

关键词： metal matrix composite SiC particle friction stir welding mechanical property

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