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A Performance Study on a Permanent Magnet Spherical Motor
Hyun-Jong Park,Ho-Joon Lee,Su-Yeon Cho,Han-Woong Ahn,Ki-Doek Lee,Chan-Yeop Park,Sung-Hong Won,Ju Lee IEEE 2013 IEEE transactions on magnetics Vol.49 No.5
<P>To realize the multi-Degree-of-Freedom (multi-DOF) movement, researches on spherical motor have been conducted in many countries. The Spherical motor has a 3-DOF, whose shaft can not only rotate as rotary motor but also tilt in the 2-DOF space. Researches on spherical motor will greatly contribute to 3-DOF systems, because spherical motor can reduce the size and weight of 3-DOF systems. This paper studies a new type of spherical motor that has rotating coils and tilting coils. Also, the current function depending on shaft angles is proposed. Finally, the torque is calculated corresponding to different shaft angles and rotating speeds. Moreover, these performances are validated via experiments.</P>
김종화 ( Jong Hwa Kim ),안재경 ( Jae Kyung Ahn ),이덕주 ( Doek Ju Lee ),이호진 ( Ho Jin Lee ) 대한설비관리학회 2003 대한설비관리학회지 Vol.8 No.1
Introduction of Ka-band systems is expected to enhance broadcasting, internet and business communications Services to provide par-regional broadcast and telecommunication applications. Among them, the mobile broadband satellite market appears to be one of the particularly attractive sectors. In Korea, the growth of the cellular phone subscribers has been so amazing that more than 40% of the total populations are provided with the mobile telephone services. Also, the broadband internet access services are also widespread throughout the country so that eight million subscribers are enjoying faster Internet surfing than ever. The mobile broadband market maturity in this country encourages the development of the mobile broadband satellite systems. In this study, potential market size for the equipments made in Korea are to be estimated and domestic mobile broadband satellite service market size is to be forecasted from 2007 to 2015. Also, spill-over effects brought by the system development are to be estimated
Development of SNP Marker to Authenticate Different Species of Sea Buckthorn by Multiplex ARMS-PCR
Padmanaban Mohanan(모하난 파드마나반),Jong Chan Ahn(안종찬),Hong Tao Wang(왕홍도),Gokulanathan Anandapadmanaban(아난다파드마나반 고클라나탄),Hyun A Lee(이현아),Yu Jin Kim(김유진),Doek Chun Yang(양덕춘) 한국약용작물학회 2017 한국약용작물학회 학술대회논문집 Vol.2017 No.2
Diversity of Fungal Endophytes in Various Tissues of Panax ginseng Meyer Cultivated in Korea
Park, Young-Hwan,Lee, Soon-Gu,Ahn, Doek-Jong,Kwon, Tae-Ryong,Park, Sang-Un,Lim, Hyoun-Sub,Bae, Han-Hong The Korean Society of Ginseng 2012 Journal of Ginseng Research Vol.36 No.2
Endophytic fungi were isolated from various tissues (root, stem, petiole, leaf, and flower stalk) of 3- and 4-year-old ginseng plants (Panax ginseng Meyer) cultivated in Korea. The isolated endophytic fungi were identified based on the sequence analysis of the internal transcribed spacer (ITS), 1-5.8-ITS 2. A morphological characterization was also conducted using microscopic observations. According to the identification, 127 fungal isolates were assigned to 27 taxa. The genera of Phoma, Alternaria and Colletotrichum were the most frequent isolates, followed by Fusarium, Entrophospora and Xylaria. Although 19 of the 27 taxa were identified at the species level, the remainder were classified at the genus level (6 isolates), phylum level (Ascomycota, 1 isolate), and unknown fungal species (1 isolate). Endophytic fungi of 13 and 19 species were isolated from 3- and 4-year-old ginseng plants, respectively, and Phoma radicina and Fusarium solani were the most frequently isolated species colonizing the tissues of the 3- and 4-year-old ginseng plants, respectively. The colonization frequency (CF%) was dependant on the age and tissue examined: the CFs of the roots and stems in the 3-year-old ginseng were higher than the CF of tissues in the 4-year-old plants. In contrast, higher CFs were observed in the leaves and petioles of 4-year-old plants, and endophytic fungi in the flower stalks were only detected in the 4-year-old plants. In conclusion, we detected diverse endophytic fungi in ginseng plants, which were distributed differently depending on the age and tissue examined.
Diversity of Fungal Endophytes in Various Tissues of Panax ginseng Meyer Cultivated in Korea
Young-Hwan Park,Soon-Gu Lee,Doek Jong Ahn,Tae Ryong Kwon,Sang Un Park,Hyoun-Sub Lim,Hanhong Bae 고려인삼학회 2012 Journal of Ginseng Research Vol.36 No.2
Endophytic fungi were isolated from various tissues (root, stem, petiole, leaf, and fl ower stalk) of 3- and 4-year-old ginseng plants (Panax ginseng Meyer) cultivated in Korea. The isolated endophytic fungi were identifi ed based on the sequence analysis of the internal transcribed spacer (ITS), 1-5.8-ITS 2. A morphological characterization was also conducted using microscopic observations. According to the identification, 127 fungal isolates were assigned to 27 taxa. The genera of Phoma, Alternaria and Colletotrichum were the most frequent isolates, followed by Fusarium, Entrophospora and Xylaria. Although 19 of the 27 taxa were identifi ed at the species level, the remainder were classifi ed at the genus level (6 isolates), phylum level (Ascomycota, 1 isolate), and unknown fungal species (1 isolate). Endophytic fungi of 13 and 19 species were isolated from 3- and 4-year-old ginseng plants, respectively, and Phoma radicina and Fusarium solani were the most frequently isolated species colonizing the tissues of the 3- and 4-year-old ginseng plants, respectively. The colonization frequency (CF%) was dependant on the age and tissue examined: the CFs of the roots and stems in the 3-year-old ginseng were higher than the CF of tissues in the 4-year-old plants. In contrast, higher CFs were observed in the leaves and petioles of 4-year-old plants, and endophytic fungi in the fl ower stalks were only detected in the 4-year-old plants. In conclusion, we detected diverse endophytic fungi in ginseng plants, which were distributed differently depending on the age and tissue examined.
Hae Il Jung,Hyoung Uk Lee,Tae Sung Ahn,Jong Eun Lee,Hyun Yong Lee,Hyon Doek Cho,Sang Cheol Lee,Sang Ho Bae 대한외과학회 2016 Annals of Surgical Treatment and Research(ASRT) Vol.91 No.6
Primary malignant peripheral nerve sheath tumor (MPNST) in a young female patient, not associated with neurofibromatosis type-I is extremely rare in the liver. A 33-year-old female was admitted with a right flank pain for a weak. The CT scan showed 12.5-cm-sized mass located at the right hepatic lobe. At laparotomy, about 20.0-cm-sized mass was on the right hepatic lobe with attachment to right diaphragmatic pleura. Right hepatic lobe and adherent part of diaphragmatic pleura were resected. On histology and immunohistochemistry, it was diagnosed MPNST. Adjuvant radiotherapy for the right diaphragmatic pleura and adjuvant chemotherapy with adriamycin, ifosfamide and cisplatin were sequentially performed. The prognosis of MPNST is generally poor and it is associated with a highly aggressive course of recurrence, metastases, and death. Our case is probably a first report about combination therapy.