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액체 전해질형 리튬 설퍼전지의 양극 바인더로 PTFE의 특성 조사
김남인 ( Kim Nam In ),서재만 ( Seo Jae Man ),이채봉 ( Lee Chae Bong ),이원재 ( Lee Won Jae ),홍태기 ( Hong Tae Gi ) 한국공업화학회 2003 공업화학 Vol.14 No.8
바인더로 carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), 그리고 polytetrafluoroethylene (PTFE)을 혼합한 형태와 polyethylene oxide (PEO) 만을 사용한 양극을 제조하였다. 제조된 양극에 대해 morphology와 전기화학적 특성 및 전지성능을 조사하여 바인더의 영향을 고찰하였다. 혼합된 바인더에 따라 양극내의 세공분포 양상은 변하고 이는 전지의 성능에 영향을 미쳤다. 양극에서 PTFE 함량이 높을수록 비표면적은 증가하였고 계면 저항은 감소하여 전지의 출력성능을 향상시키는 효과가 있었다. PTFE (15 wt%)를 혼합한 양극에서 가장 우수한 방전 특성을 보였고 이 때 비표면적과 설퍼 이용률은 각각 16 m²/g과 70% 이상이었다. The cathodes with various binders such as carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), polytetrafluoroethylene (PTFE), and polyethylene oxide (PEO), in different combinations including sole component in the case of PEO, were prepared. These cathodes were examined by morphology measurement, electrochemical characteristics, and discharge performance to inspect the effect of binder on Li-S battery. The morphology of cathode varies with various binder combination and the performance of battery is greatly affected by the morphology. The specific surface area (SSA) of cathode composite material increases and the interface resistance reduces with increasing content of PTFE introduced into the cathode. The battery with cathode including F`TFE (15 wt%) showed the distinguished power enhancement, compared with those composed of other binder combinations. The cathode with predominant results was able to increase SSA and sulfur utilization by 16m^(2)/g and more than 70%, respectively.
김병준(Byeong-Jun Kim),권기철(Ki-Chul Kwon),양용만(Young-Man Yang),김남(Nam Kim) 한국콘텐츠학회 2018 한국콘텐츠학회논문지 Vol.18 No.1
본 논문에서는 눈을 깜빡(eye-blink)일 때 발생하는 안전도(EOG, electro-oculogram) 신호를 이용하여 손을 사용하지 않는 가상현실 HMD(head mounted display)용 키보드 시스템을 제안하였다. 본 시스템은 디스플레이 소자, 자이로스코프센서, 중력센서, 뇌전도(EEG, electro-encephalogram) 센서 등으로 구성되며, 시스템의 제어 및 그래픽 처리 등을 위한 Unity3D 엔진으로 가상현실 HMD용 키보드 시스템을 구현하였다. 구현된 키보드의 방식은 한글의 경우 천지인 키보드 방식을 사용하였으며 영어, 숫자, 기호의 경우 3×4 방식을 사용하여 공간상의 문제를 해결하였다. 구현된 시스템을 통해 손을 사용하지 않고 목의 움직임과 안전도만으로 가상현실 HMD의 키보드 입력이 가능함을 확인하였다. A keyboard system for hands-free virtual reality head mounted display using electrooculogram (EOG) signal which occurs during the eye-blinking is proposed. This system consists of display device, gyroscope sensor, gravity sensor and electro-encephalogram (EEG) sensor, and it is implemented with Unity3D engine for system control and graphic processing. If the input language of proposed keyboard system is Korean, i.e. Hangul, the Chonjiin keyboard method is utilized; but for the English spelling, numbers or special characters, 3×4 keyboard method is used in order to solve the spatial problem. By the implemented method, it can be verified that the user can handle the keyboard input of virtual reality head mounted display with only neck movement and EOG, instead of using hands.
Plerocercoid의 표피 및 그 관련조직의 구조에 관한 연구
金鍾煥,劉寬凞,金南萬 충남대학교 자연과학연구소 1984 忠南科學硏究誌 Vol.11 No.1
The tegument of the plerocercoid stage of Spirometra sp. from Natrix tigrina was examined by electron microscopy to determine whether the most anterior level was similar to the trunk portion of the integumental structure. Significant differences were observed in the shape and arrangement of microtriches, distribution of mitochondria and the different types of bodies in the tegument. A few and short microtriches were observed at the most anterior portion, while many microtriches with long and broad proximal portion were arranged densely in the trunk portion. Many mitochondria are distributed just beneath the microtricheal layer in the anterior portion, but they were observed on the basement layer in the trunk. In the tegument of the anterior portion the most cytoplasmic bodies were showed round and oval vesicular shape, while they were rod-shape in trunk portion. The basement layer of the trunk portion was thicker than that of the anterior portion and the location of muscular layers was replaced with circular and longitudinal muscle in the anterial and trunk portion.
金鐘煥,金南萬,朴塡淑,崔鶴鳳 忠南大學校 環境問題硏究所 1986 環境硏究 Vol.4 No.2
This study was undertaken to elucidate the status of trematodes infection at the several localities along the Gagok Stream-side area, Wondeog Eup, Samcheok Gun, Gangwon Do, Korea from February 1985 to July 1986. A total of 2,195 snails was examined for cercaria, and individuals 74(3.4%) were infected with cecaria of trematoda: Cercaria nipponensis, cercaria of Metagonimus yokogawai, M.takahashii and Pseudexorchis major. A total of 105fishes, 10species, 6families was examined for metacercaria, and 4fished (4%), 3 species, 3families were infected with metacercaria of Metagonimus yokogawai, M.takahashii and hasegawa A. A total of 1,014 crayfishes was examind, only one crayfish was positive with metacercaria of Paragonimus westermani. The parasite eggs and cysts from domestic animals (11cats and 13dogs) were found Paragonimus westermani, Dihpyllobothrium spp., Toxocara cati, Toxocara canis and Iso pora rivolta.
錦江上流産 다슬기(Semisulcospira spp.)에 奇生된 吸蟲類 幼生에 關한 硏究
朴塡淑,金鐘煥,金南萬 忠南大學校 環境問題硏究所 1987 環境硏究 Vol.5 No.1
The studies on cercarial fauna and identifications from Semisulcospira snails were carried out in the 3 localities along the upper stream and 2 tributaries of Kumgang, other locality of Kagokchon, Kangwon-do. The emerging cercariae were found from 172(4.9%) among 3,489 snails and were classified as the following 9 species; Metagonimus yokogawai Katurada, 1913, Metagonimus yokogawai Miyata type, one identified Metagonimus spp., Pseudexorchis major Yamaguti, 1938, Cercaria yoshidae Cort et Nichols, 1920, Cercaria nipponensis Faust, 1924, Cercaria incerta Faust, 1924, Cercaria innominatum Faust, 1924, Pseudobilharziella corvi Yamagusti, 1941. The geographical distribution of cercaria was shown that the highest incidence was observed in the snails collected at Soch'on-ri station 10.0-10.3%, and followed Muju station 7.7-8.0%, Sutong station 5.0-6.5%, Kasuwon-dong station 2.0-3.3%, Hwanggan station 2.0-2.8% and Kagok Ch'on 2.6-4.8%. The monthly fluctuation of cercaria from the snails 8.2% in July 1985, 15.2% in August, 11.1% in September, 4.5% in October, 2.8% in November, 3.4% in April 1986, 5.0% in May, 6.5% in June. Experimental infection of the cercariae of Metagonimus spp. to the goldfish was carried out in order to identify the cercarial species of adult worms. The infection rate of metacercaria in the fished was 22.9% and was fin of the fish(86.7%) the highest metacercarial infection site, the next was scale (13.3%), however, no metacercaria was found in muscle as well as another parts of the body. Adult worms were removed from the small intestine of albino rat after 10days from the infection with metacercariae from the goldfish. The morphological characteristics of the worms was the same species as Metagonimus yokogawai Miyata type.