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어댑티브 매칭 회로를 이용한 5.8 GHz 고효율 RF-DC 컨버터
양기훈(Kee Hoon Yang),오태섭(Tae Seob Oh),김재빈(Jae Bin Kim),조종완(Jong Wan Jo),이강윤(Kang-Yoon Lee) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
This paper presents a highly efficient RF-DC converter for wireless energy collection applications sensitive to very low input power with a wide dynamic range. Implemented via an adaptive matching network to fine-tune impedance matching across dynamic input ranges. To ensure operation for wide inputs, an adaptive input matching network has been applied to this proposed RF-DC converter. An adaptive matching design circuit has a relatively low conversion efficiency of DC power. To improve the efficiency and DC output of RF-DC converters, reconfigurable cores have been applied to design circuits. As the number of cores in the RF-DC converter increases, the internal impedance decreases, allowing the RF-DC converter to operate at low input power.
Cellular Proliferation and Expression of Proto-Oncogenes in Chicken Embryonic Cells
KIM, YEON WOONG,KIM, CHOOG WON,SUNG, SOON KEE,KANG, KEE RYEON,KANG, YOON-SE 경상대학교 유전공학연구소 1988 遺傳工學硏究所報 Vol.7 No.-
Tyrosine protein kinase has been implicated in the mediation of cellular proliferation and development. Products of several viral oncogenes and growth factors have been shown to be associated with tyrosine kinase activity. Thus we investigated expression of tyrosine kinase-related proto-oncogenes during early chicken embryonic development (from 30 hr to 10 day). Each of four c-onc gene (i.e c-fos, c-src, c-abl, and c-fes/fps) showed characteristic expression depending on the time periods within 10 days, but level of c-erbB appeared very low compared to the other proto-oncogenes. Histone H2B gene was used as control.
Kim, Choong Won,Kim, Yeon Woong,Kang, Kee Ryeon,Eom, Mi-Ok,Jung, Eun Joo,Kim, Jong Chul,Ahn, Hong Joon,Kang, Yoon-Se 경상대학교 유전공학연구소 1992 遺傳工學硏究所報 Vol.11 No.-
Chicken elongation factor 2(EF-2) cDNA was isolated from a chicken intestine cDNA libary and the sequence was determined. The probe for the screening of library was prepared by polymerase chain reaction(PCR) using two degenerate oligonuckeotide primers encoding NH_2-terminal region (residue 9-14) of chicken EF-2 and a conserved GTP binding domain (residue 80-84) of hamster EF-2. The sequence of amplified 228 bp product was identical to that of hamster EF-2(residue 9-84). One of 5 positive clones, pCEK4, consisted of 3,144 nucleotides with 2,574 bp open reading frame coding for 858 amino acid reaidues. The M_r 95,361 of the protein calculated from the amino acid sequence agreed well with the molecular weight of chicken and other mammalian EF-2(95,000) measured by SDS-PAGE. Sequence identity between chicken and other mammalian EF-2s(human, hamster, and rat) was 97%, while the sequence of GTP-binding/-hydrolysis domain was 99% identical. This result indicates that EF-2 is one of the highly conserved proteins and its structure has not been changed significantly during evolution. When expression of EF-2 in various stage of chicken embryo development was estimated by measuring mRNA and protein of EF-2, the result showed that the levels of its EF-2 mRNA and protein levels were the highest in 3 day embryo and then decreased gradually.
KIM, CHOONG WON,KIM, YEON WOONG,KANG, KEE RYEON,JUNG, EUN JOO,KIM, JONG CHUL,KANG, YOON SE 경상대학교 유전공학연구소 1991 遺傳工學硏究所報 Vol.10 No.-
Five cDNA clones of elongation factor 2(EF-2) were isolated from chicken intestine cDNA library. All insert in λgt 10 expect one were found to be 3.2 kb. The size should fully encodes for chicken EF-2 with molecular mass of 95kDa. using one of the clones, designated pCEK4, we determined partial amino acid sequence of EF-2 protein. The sequence included NH_2-terminal 169 amino acids correaponding to the common motif of five regions found in GTP-binding proteins. Comparative sequence analysis of each domain among chicken and hamster EF-2 shpwed a striling homology. ADP-ribosylation of chicken EF-2 in the presence of diphtheria toxin and NAD^+ provided an indirect evidence that ADP-ribosylatable diphthamide, 2-[3-carboxyamide-3-(trimethyl ammonio)-propyl]histidine. Finally measurements of EF-2 in chicken embryo of early developmental stage suggest that expression of EF-2 is correlated with the extent of cell growth and development.
Menetrier 병에 동반된 낭성 심재성 위염 1 예
이방희,박미자,최호순,고정희,최덕례,박강서,박기현,성시경,김덕기,류창수,이현상,강윤중 대한내과학회 1995 대한내과학회지 Vol.48 No.6
Menetrier's disease, hypertrophec gastritis or hypertophic gastropathy, with mucosal hypertrophy in which the enlarged gastric rugae involved part or all of the stomach giving the appearance of cerebral convolutions. The enlarged rugae which characterize this disease are not attributable to lymphoma, infiltrative carcinoma or non-neoplastic disease, such as syphilis, tuberculosis kor sarcoidosis. Most impressive of Histologic features if the expanded or thickened mucosa, are mostly to an elongation of the foveolae, which become tortuous or corkscrew. Often these elongated pits will extended to the base of the mueosa where they may become cystic. On occasion, the deep cysts may apper to penetrate the muscularis mucosae and extend into the superficial submucosa, where they are surrounded by bundles of smooth muscle, another example of gastric cystica profunda. Gastritis cystica profunda is a rare condition in which mature glandular epithelium extends into the tissues beneath the muscularis in which mature glandular epithelium extends into the tissues beneath the muscularis mucosae. Benign gastric pseudotumor, gastritis cystica profunda, posses malignant histological features but functionally benignly. It is an analogous to similiar conditions affecting the small and large intestines that are called, repectively, enteritis and colitis cystica profunda. The proposed pathogenesis of these abnormalities relates to ischemia, chronic inflammation, and the presence of a foreign body. We present a case of Menetrier's disease assocated with gastritis cystica profunda and a brief review of clinical and pathologic pictures and management.