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Three-Port Converters with a Flexible Power Flow for Integrating PV and Energy Storage into a DC Bus
Tian Cheng,Dylan Dah-Chuan Lu 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6
A family of non-isolated DC-DC three-port converters (TPCs) that allows for a more flexible power flow among a renewable energy source, an energy storage device and a current-reversible DC bus is introduced. Most of the reported non-isolated topologies in this area consider only a power consuming load. However, for applications such as hybrid-electric vehicle braking systems and DC microgrids, the load power generating capability should also be considered. The proposed three-port family consists of one unidirectional port and two bi-directional ports. Hence, they are well-suited for photovoltaic (PV)-battery-DC bus systems from the power flow viewpoint. Three-port converters are derived by combining different commonly known power converters in an integrated manner while considering the voltage polarity, voltage levels among the ports and the overall voltage conversion ratio. The derived converter topologies are able to allow for seven different modes of operation among the sources and load. A three-port converter which integrates a boost converter with a buck converter is used as a design example. Extensions of these topologies by combining the soft-switching technique with the proposed design example are also presented. Experiment results are given to verify the proposed three-port converter family and its analysis.
Mineral-rich Solar Sea Salt Generates Less Oxidative Stress in Rats than Mineral-deficient Salt
Tiancheng Gao,조정용,Ling-Yun Feng,Saoraya Chanmuang,박선영,오정균,Tong-Kun Pai,함경식 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.3
Certain solar sea salts have a high content ofessential minerals other than NaCl. The effects of mineralsin sea salts on oxidative stress in rats were investigated. Mineral-rich salt (MRS) and mineral-deficient salt (MDS)did not scavenge DPPH radicals. When MRS and MDS(equivalent to 1.8 g NaCl/kg/day) and a saline control wereorally administered to rats for 7 weeks, MRS group ratsshowed lower levels of plasma lipid oxidation than MDSgroup rats. MRS group rats exhibited significantly lowerlevels of protein carbonyls and 8-hydroxy-2'-deoxyguanosinein the liver than MDS group rats. MRS group rats showedlower protein expression of NF-κB p65 in adipose tissuethan MDS group rats. Intake of MRS may generate lessoxidative stress than intake of MDS.
김천성(TIANCHENG JIN),정은희(Eun-Hee Jeong) 한국정보전자통신기술학회 2021 한국정보전자통신기술학회논문지 Vol.14 No.3
최근 소셜미디어에서 관광지에 관한 게시글과 의견이 활발하게 공유된다. 이러한 소셜 빅데이터는 소비자가 인식하는 관광지의 객관적인 이미지를 파악할 수 있는 유의미한 정보를 제공한다. 이에 따라 본 연구는 소셜미디어의 빅데이터를 이용해서 강원도 지역에 대한 관광 이미지를 분석하는 것이다. SNS 및 빅데이터의 대표적인 분석 방법인 텍스트마이닝과 의미연결망 분석 절차를 사용해서 강원도의 관광 이미지를 분석하고 차별화된 경쟁력을 확보할 수 있는 이미지 향상에 대한 방안을 제공하고자 하였다. 분석결과에 따르면, 강원도 지역의 관광으로 속초, 강릉, 양양 순으로 지명 언급이 높은 수준으로 나타났고, 여행목적은 맛집투어, 식도락, 가족여행, 휴가, 체험 등으로 나타났다. 특히, 당일여행, 주말, 체험 등을 선호하는 것으로 나타났다. 분석결과를 바탕으로 네 가지 제안을 하였다. 첫째, 강원도 관광의 활성화를 위하여 가격대별로 다양한 호텔, 숙박 시설과 체험 관광 마케팅이 필요하다. 둘째, 강원도의 자연경관과 수도권 근접성을 활용한 당일상품을 개발할 필요가 있다. 셋째, 강원도 향토음식과 전통식당의 홍보가 필요하다. 마지막으로 힐링과 가족여행에 적합한 관광 마케팅 개발이 필요하다. 본 연구 결과를 통해 강원도의 관광 이미지를 현황을 파악하고 경쟁력을 향상할 수 있는 마케팅 전략을 제시하였다. 또한, 관광 소비자의 빅데이터를 관광사업 분야에서 활용할 수 있는 이론적 근거를 제공하였다. Recently, posts and opinions on tourist attractions are actively shared on social media. These social big data provide meaningful information to identify objective images of tourist destinations recognized by consumers. Therefore, an in-depth understanding of the tourist image is possible by analyzing these big data on tourism. The study is to analyze destination images in Gangwon-do using big data from social media. It is wanted to understand destination images in Gangwon-do using semantic network analysis and then provided suggestions on how to enhance image to secure differentiated competitiveness as a destination for tourists. According to the frequency analysis results, as tourism in Gangwon-do, Sokcho, Gangneung, and Yangyang were mentioned at a high level in that order, and the purpose of travel was restaurant tour, gourmet food, family trip, vacation, and experience. In particular, it was found that they preferred day trips, weekends, and experiences. Four suggestions were made based on the results. First, it is necessary to develop various types of hotels, accommodation facilities and experience-oriented tour packages. Second, it is necessary to develop a day-to-day travel package that utilizes proximity to the Seoul metropolitan area. Third, it is necessary to promote traditional restaurants and local food. Finally, it is necessary to develop tourist package suitable for healing and family travel. Through this research, the destination image of Gangwon-do was identified and a tourism marketing strategy was presented to improve competitiveness. It also provided a theoretical basis for the use of the big data of tourism consumers in the field of tourism business.
( Yujen Tseng ),( Lili Ma ),( Tiancheng Luo ),( Xiaoqing Zeng ),( Feng Li ),( Na Li ),( Yichao Wei ),( Shiyao Chen ) 대한간학회 2018 Gut and Liver Vol.12 No.5
Background/Aims: Gastroesophageal variceal hemorrhage is a common complication of portal hypertension. Endoscopic therapy is currently recommended for preventing gastroesophageal variceal rebleed. However, the rate of variceal rebleed and its associated mortality remain concerning. This study is aimed at differentiating patient response to endoscopic therapy based on endoscopic ultrasound (EUS) findings. Methods: One-hundred seventy patients previously treated with repeat endoscopic therapy for secondary prophylaxis were enrolled and classified into two groups based on treatment response. Prior to consolidation therapy, all patients received an EUS examination to observe for extraluminal phenomena. All available follow-up endoscopic examination records were retrieved to validate study results. Results: Of the 170 subjects, 106 were poor responders, while 64 were good responders. The presence of para-gastric, gastric perforating, and esophageal perforating veins was associated with poor patient response (p<0.001). The odds ratio for para-gastric veins was 5.374. Follow-up endoscopic findings for poor responders with incomplete variceal obliteration was closely correlated with the presence of para-gastric veins (p=0.002). Conclusions: The presence of para-gastric veins is a characteristic of poor response to endoscopic therapy for treating gastroesophageal varices. Early identification of this subgroup necessitates a change in course of treatment to improve overall patient outcome. (Gut Liver 2018;12:562- 570)