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Pyloric Gland Adenoma of the Esophagus Treated by Endoscopic Submucosal Dissection: A Case Report
Park Kwangbeom,Kim Do Hoon,Lee Sung Duck,Lee Hyun,Jung Hwoon-Yong 거트앤리버 소화기연관학회협의회 2022 Gut and Liver Vol.16 No.3
A pyloric gland adenoma is a rare neoplasm that occurs most frequently in the stomach and should be removed because of its precancerous potential. Although there have been case reports of pyloric gland adenomas in extragastric areas such as the duodenum, pancreas, and bile duct, esophageal pyloric gland adenoma has never been reported in Korea. Herein, we report a case of esophageal pyloric gland adenoma that was successfully treated by endoscopic submucosal dissection.
An analysis of CH4/N2 rich biogas production, fuel treatment process and microturbine application
Jungkeuk Park,Kwangbeom Hur,Sanggyu Rhim,Ho Kang 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.1
Biogas usually contains CH_4 and CO_2 as main components with the ratio of 6 : 4, and its composition varies with wide range depending on digester conditions. In addition to concentration change of each constituent, biogas composition could be changed due to the variations in the organic matter treatment process. The aim of the study is to analyze the production and application to a microturbine system of CH_4/N_2 rich biogas produced from Gong-Ju wastewater treatment plant. CH_4/N_2 rich biogas is produced due to the internal wastewater recirculation. The internal wastewater recirculation is intended to enhance NO_3^− removal without additional carbon source input. As a result, the digester was shown to be the highest contributor for nitrogen removal and average CH_4 concentration was lowered compared to the typical biogas composition. Nitrate removal rate was influenced by the internal recirculation ratio. Content of N_2has no effect on biogas clean-up system performance. Besides, adaptability of CH_4/N_2 rich biogas to microturbine was satisfactory with very low NOx and SO_2 concentration in microturbine exhaust gas. Influence of high N_2 concentration of biogas on NOx concentration was limited due to the low combustion temperature.
소규모 매립가스 자원화를 위한 마이크로터빈 열병합발전 및 유리온실 CO<sub>2</sub> 농도 증가 시스템의 타당성 연구
박정극 ( Jungkeuk Park ),허광범 ( Kwangbeom Hur ),임상규 ( Sanggyu Rhim ),이인화 ( Inhwa Lee ) 한국신재생에너지학회 2009 신재생에너지 Vol.5 No.2
As new small scale LFG (landfill gas) energy project model which can improve economic feasibility limited due to the economy of scale, LFG-Microturbine combined heat and power system with CO<sub>2</sub> fertilization into greenhouses was proposed and investigated including basic design process prior to the system installation at Gwang-ju metro sanitary landfill. The system features CH<sub>4</sub> enrichment for stable microturbine operation, reduction of compressor power consumption and low CO emission, and CO<sub>2</sub> supplement into greenhouse for enhancement plant growth. From many other researches, high CO<sub>2</sub> concentration was found to enhance CO<sub>2</sub> assimilation (also known as photosynthesis reaction) which converts CO<sub>2</sub> and H<sub>2</sub>O to sugar using light energy. For small scale landfills which produce LFG under 3 ㎥/min, among currently available prime movers, microturbine is the most suitable power generation system and its low electric efficiency can be improved with heat recovery. Besides, since its exhaust gas contains very low level of harmful contaminants to plant growth such as NOx, CO and SOx, microturbine exhaust gas is a suitable and economically advantageous CO<sub>2</sub> source for CO<sub>2</sub> fertilization in greenhouse. The LFG-Microturbine combined heat and power generation system with CO<sub>2</sub> fertilization into greenhouse gas to enhance plant growth is technologically and economically feasible and improves economical feasibility compared to other small scale LFG energy project model.
Clinical course of asymptomatic duodenal subepithelial lesions
Seokin Kang,Kwangbeom Park,Do Hoon Kim,Yuri Kim,Hee Kyong Na,Jeong Hoon Lee,Ji Yong Ahn,Kee Wook Jung,Kee Don Choi,Ho June Song,Gin Hyug Lee,Hwoon-Yong Jung 대한내과학회 2024 The Korean Journal of Internal Medicine Vol.39 No.4
Background/Aims: There is limited knowledge regarding the management of duodenal subepithelial lesions (SELs) owing to a lack of understanding of their natural course. This study aimed to assess the natural course of asymptomatic duodenal SELs and provide management recommendations. Methods: Patients diagnosed with duodenal SELs and followed up for a minimum of 6 months were retrospectively investigated. Results: Among the 443,533 patients who underwent esophagogastroduodenoscopy between 2008 and 2020, duodenal SELs were identified in 0.39% (1,713 patients). Among them, 396 duodenal SELs were monitored for a median period of 72.5 months (interquartile range, 37.7–111.3 mo). Of them, 16 SELs (4.0%) showed substantial changes in size or morphology at a median follow-up of 35.1 months (interquartile range, 21.7–51.4 mo). Of these SELs with substantial changes, tissues of two SELs were acquired using endoscopic ultrasound-guided fine needle aspiration biopsy: one was a lipoma and the other was non-diagnostic. Three SELs were surgically or endoscopically removed; two were diagnosed as gastrointestinal stromal tumors, and one was a lipoma. An initial size of 20 mm or larger was associated with substantial changes during follow-up (p = 0.016). Conclusions: While the majority of duodenal SELs may not exhibit substantial interval changes, regular follow-up with endoscopy may be necessary for cases with an initial size of 20 mm or larger, considering a possibility of malignancy.