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계면접촉압력에 따른 열-마찰전기 에너지하베스팅 성능향상
장광엽(Kwang Yeop Jang),이동건(Dong-Gun Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this paper, an entirely new approach for thermal energy harvesting is developed by paring triboelectric effect to magneto-thermoelectric generator. The magneto-thermo-triboelectric generator(MTTG) proposed can provide costeffective thermal energy conversion of low grade thermal energy to electrical energy. Its design is based on the concept of triboelectric effect and active ferromagnetic materials with second order phase transition. Increasing the interface contact area of triboelectric layers can raise the efficiency of triboelectric conversion. We characterize the interface contact pressure properties of the developed device. We also demonstrate an example of tunable design for enhanced device with the improved interface contact pressure.
장광엽(Kwang-Yeop Jang),이동건(Dong-Gun Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The focus of this paper is on the design and development of a generation of thermal energy harvesting systems that could make electrical energy from the low temperature wasted heat environment. Conventional thermoelectric devices to harvest low-temperature heat are limited due to low ZT for small temperature difference. In contrast, the proposed approach of pairing magneto-thermoelectric generator technology to triboelectric effect will provide high potential for efficient power harvesting from low-temperature waste heat generated in such as human skin. Experiments on fabricated prototype devices are conducted to measure the fundamental power properties with temperature differences as small as 5 degree Celsius. The results successfully demonstrate feasibility of efficient low-temperature energy harvesting.
제주도 숨은물벵뒤 습지 서식 Alphaproteobacteria 및 Gammaproteobacteria 강에 속하는 신변이주의 특성
김하늘 ( Ha Neul Kim ),강지영 ( Ji Young Kang ),최재희 ( Jae Hee Choi ),최정욱 ( Jeong Uk Choe ),이상훈 ( Sang Hoon Lee ),김태의 ( Tae Ui Kim ),이하나 ( Ha Na Yi ),장광엽 ( Kwang Yeop Jahng ),조장천 ( Jang Cheon Cho ),이현환 ( Hyu 한국환경생물학회 2011 환경생물 : 환경생물학회지 Vol.29 No.3
In this study, samples were collected from the Sumummulbangdui wetland at the Halla Mountain in Jeju Island in order to isolate novel bacterial strain. Bacterial strains belonging to the class Alphaproteobacteria, and Gammaproteobacteria were isolated after spreading samples onto solid agar media. The 16S rRNA gene sequences of the strains assigned to the two classes were compared to those of type strains of the species. The strains that showed less than 98.7% 16S rRNA gene sequence similarity to the validly published species were considered to be novel species candidates. A total of 19 strains were regarded as novel strains which can be regarded as novel species candidates. In the Alphaproteobacteria, 6 novel strains were affiliated with the genera Novosphingobium, and Rhizobium. A total of 13 novel strains belong to Gammaproteobacteria that assigned to the family Moraxellaceae, Pseudomonadaceae, and Enterobacteriaceae were identified. Cultural, physiological, chemotaxonomic characteristics and fatty acids compositions have been determined for the novel species candidates, and the characteristics are described in this study.
慶南 漆西面 自然늪의 水質과 周邊 土壤의 微生物學的 및 理化學的 性質에 對하여
張光燁,鄭奉佑 全北大學校 基礎科學硏究所 1983 基礎科學 Vol.6 No.1
For obtaining the information of environmental conditions of a natural swamp at Chilseo-Myeon Kyungnam, where was peoposed as a site for garbage dump from Pusan and Kyungnam area, physicochemical and microbiological properties of the and soil of that site were investigated. The results are as follows : 1. Water quality of the site 2 where had been dumped with garbage was somewhat polluted such that BOD, COD and SS value were 14.6, 41.5 and 57.0 mg/1 respectively. 2. The microbial population density of the site 2 was relatively high, it showed that much orgnic waste was elucidated from garbage. Especially, the density of coloform that much organic waste was elucidated from garbage. Especially, the density of coliform bacteria was higher than other water environments. 3. The microbial population density of the soil of Chilseo-Myon area was similar to that other soil environments. From the above results, when the natural swamp is dumped with garbage, it will influence on the water environments of the Nakdong River.