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김민지(Minji Kim),장지원(Jiwon Jang),전승진(Seungjin Jeon),김창균(Changgyun Kim),김남철(Namchul Kim),허설(Searle Huh),염세경(Sekyoung Youm) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
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金南喆,金昌浩 동국대학교 농림과학연구소 1989 農林科學 論文集 Vol.13 No.-
Study on the determination for degree of Green naturality(D.G.N) was surveyed in Kadog island in Euichang-gun, Kyongsangnam-do from April to July 1988. The obtainned results were as followed ; 1. The flora of this island consisted of 138families, 475genera, 722 species, 1 subspecies, 126 varietis, and 21 forms, or total 870 kinds. 2. Investigations based on the D.G.N. that the grade 6,7,8 which naturality was high was must widely distributied(70%), followed by the grade 2(23%) and the grade5(7%) 3. The dominant species in this island was pinus thunbergii PARL, Carpinus laxiflora BL, Camellia japonica L, Eurya emarginate (THUNB)MAKINO. 4. The biomass and the production in this island was 113,095tons/㏊ and 19.330tons/㏊/Year 5. The amount of Oxygen production and the amount of So_2 absorbed by the vegetation of this island was estimated as 20,489.8tons and 24.3tons
BaO-Nd₂O₃-TiO₂계 유전재료에서 하소온도 및 분쇄시간 변화에 따른 유전특성 고찰
김남철 公州大學校工科大學生産技術硏究所 1998 論文集 Vol.6 No.-
This paper presents a dielectric and phase behavior of the BaO-Nd₂O₃-TiO₂ ceramic system by the effect of calcination temperature and milling time. Over the temperature range of 1000∼1150℃, the phase of Nd₂Ti₄O11 was found to be decreased, whereas the phases of Nd₂Ti₂O7 and BaNd₂Ti5O14 were increased, resulting in only two phases(Nd₂Ti₂O? and BaNd₂Ti5O14) to be co-existed at the temperature of 1150℃. In addition, the I.R(Insulation Resistance) was found to be strongly affected by the calcination temperature, rather than other dielectric characteristics (dielectric constant, quality factor, etc.). As increasing the calcination temperature, the phase separation between reacted and unreacted particles was occurred and accelerated, giving rise to fine-grained and uniform microstructures after sintering with those powder. The milling time was found to have an effect on dielectric characteristics; dielectric constant, loss factor, temperature coefficient of capacitance, and sintered density, etc. In the range of 10∼240 minutes, dielectric and physical characteristics were found to be improved by increasing the milling time. In this study, dielectric capacitors were successfully fabricated with good dielectric properties; sintered density ρ=5.2g/cc (98% theoretical), dielectric constant ε=63~65, quality factor Q>5000, temperature coefficient of capacitance TCC=-24∼-30ppm/C. Insulation Resistance I.R>10¹⁴Ωcm. These ceramic capacitors with properties are promising for the application of temperature compensation and microwave dielectrics.