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金哲聖(Kim Chul Sung) 국민대학교 교육연구소 1982 교육논총 Vol.1 No.-
For studies on the magnetic properties of spinel crystals, both microscopic measurements by the M?ssbauer spectra method and macroscopic measurements by the magnetic susceptibility method have been made on a number of compounds in the family Fe<SUB>x</SUB>Cu<SUB>1-x</SUB> Rh₂Se₄. The Fe<SUB>x</SUB>Cu<SUB>1-x</SUB> Rh₂Se₄ were prepared by the direct composition method from the X-ray diffraction studies lattics parameters have been shown with Vegad law. The M?ssbauer spectra were analyzed by the Non linear regression least square fitting method using a computer. Temperature dependence of inverse magnetic susceptibility show that the values of θ indicate -150K and -182Kfor Fe<SUB>0.1</SUB> Cu<SUB>0.9</SUB> Re₂ Se₄ and FeRh₂Se₄ respectively. Spinel crystals Fe<SUB>x</SUB>Cu<SUB>1-x</SUB> Rh₂Se₄ are antiferromagnetic exhibiting negative superexchange interaction. The isomer shift indicate that Fe ion tend toward Fe?³ and Fe?² values respectively.
대구,경북지역 요양보호사의 직무소진이 서비스 질에 미치는 영향
김철성 ( Chul Sung Kim ),조만복 ( Man Bok Jo ),김일범 ( Il Bum Kim ) 한국노인의료복지학회 2013 노인의료복지연구 Vol.5 No.1
This research showed that low-educational singles or divorced persons have a high job burnout according to general characteristics. And the worse health a person falls into, the higher job burnout a person gets by the difficulty of job performance. It is necessary to make job burnout low through responsible improvement of labor conditions. The improvement of appropriate job environment is required too because it showed that the long time work makes job burnout high. The systematic support is needed to maintain continuously the service with good quality because it showed that care workers with long-time work experience and good health are skilled in service. Also because it showed that care workers have usually provided the efficient service if the daily work hour is shorter, the long-time work should be avoided. The political support is required to provide the service with good quality through improvement of labor conditions because a person with the higher salary has usually provided the service of higher quality. According to the analysis result about the influence to service quality by job burnout, it was verified that burnout has an influence to the service quality. It showed that especially the lack of personal sense of accomplishment has a great effect to the service. Therefore the consolidation between workers and supporting welfare practice are really required to inspire personal sense of accomplishment of care workers through job condition improvement of facilities and emotionally stable work.
NdFe10.7TiM0.3(M = B, Ti)의 Mossbauer 연구
김철성(Chul Sung Kim),이용종(Young Jong Lee),김윤배(Y. B. Kim),김창석(C. S. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The authors have studied crystallographic and magnetic properties of NdFe_(10.7)TiM_(0.3)(M = B, Ti) by X-ray diffraction, VSM magnetometer, and Mossbauer spectrometer. The Alloys were prepared by arc-melting under argon atmosphere. The NdFe_(10.7)TiM_(0.3) has pure single phase, whereas the NdFe_(10.7)TiM_(0.3) contains some α-Fe, from powder X-ray diffractometry. The NdFe_(10.7)TiM_(0.3) has the ThMn₁₂-type tetragonal structure with α_0=8.587 A and C_0= 4.788 Å. The Curie temperature (Tc) is 570 ± 3 K from Mossbauer spectroscopy performed at various temperatures ranging from 13 to 770 K. Each spectrum of below Tc was fitted with five subspectra of Fe sites in the structure (8i₁,8i₂, 8j₁, 8j₂ and 8f). The area fraction of the subspectra at room temperature are 16.4, 8.2, 14.8, 21.3 and 39.3 %, respectively. Magenetic hyperfine fields for the Fe sites decrease in the order, Hhf(8i)>Hhf(8f)>Hhf(8f).
Hexaferrite 쉬트자석의 개발과 자기적 성질에 관한 연구
김철성(Chul Sung Kim),박승일(Seung IeI Park),오영제(Young Jei Oh) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.4
In order to study the effect of additives SiO₂ on the magnetic properties of hexaferrite sheet magnet, we used X-ray diffractometer, Mossbauer spectrometer, and VSM magnetometer. We have prepared Ba_(0.25)Sr_(0.75)Fe₁₂O_(19) green sheets by the Dr. Blade method. Most of samples have a magnetoplumbite crystal structure of typical M-type hexaferrite. The lattice parameters are found not to be affected by the addition of SiO₂. α-Fe₂O₃ phase develops above SiO₂ 2.0 wt. %. Isomer shifts indicate that the valence of Fe ions is trivalent. Curie temperatures decrease slightly with increasing SiO₂ concentrations. It means that the Si⁴+ subsitution for 12k-site Fe³+ has an effect on the superexchange interactions Fe-O-Fe, which change the distance and the angle between cations and anions. It was suggested that α-Fe₂O₃ phase results from the excessive Fe produced by subsituting Si⁴+ for Fe³+. Based upon the results of Ba_(0.25)Sr_(0.75)Fe₁₂O_(19) added with SiO₂, we concluded that Hc, Ms and Mr depend more strongly on the microstructure characteristics than on the cation substitution.
졸겔 합성에 의한 LiFeO₂ 분말의 Mossbauer 연구
안성용(Sung Yong An),김철성(Chul Sung Kim) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.2
α-LiFeO₂ powders have been prepared by a sol-gel method. The crystallographic and magnetic properties were characterized with a x-ray diffractometry, Mossbauer spectroscopy, and vibrating Samples magnetometry. The γ-LiFeO₂+LiFe_5O_8 phase is observed in the Samples annealed at 600 ℃ for 3h in air and α-LiFeO₂ phase is observed in the Samples annealed at 600 ℃ for 3 h in H₂(5%)/Ar(Bal.) gas atmosphere. The crystal structure of α-LiFeO₂ is found to be cubic with a lattice a=4.193±0.0005 Å. The Neel temperature of α-LiFeO₂ is found to be 130±3 K.
원격 비접촉식 목표 추적형 생체신호측정시스템에 관한 연구
최광욱,김철성,양철승,이정기,Choi, Kwang-Wook,Kim, Cheol-Sung,Yang, Chul-Seung,Lee, Jeong-Gi 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.9
전 세계적으로 통신발달, 수명연장 등의 이유로 1인 가구가 급증하고 있으며 그에 따라 고독사 등의 문제점이 발생하고 있다. 이러한 문제점을 해결하고 사생활 침해가 없이 혼자서도 건강한 삶을 유지할 수 있도록 본 논문은 IR-레이더 및 레이저 변위센서를 이용하여 원거리 비접촉 생체신호 측정이 가능한 시스템을 제안하였다. 제안된 시스템은 원거리에서 비접촉으로 생체신호를 측정하는 방법으로, 실내 위치추적을 위한 IR 레이더 시스템과 비접촉 생체신호 측정을 위한 변위센서, 그리고 센서를 목표지점으로 이동하는 구동부로 구성되며 기존의 1m에 불과하던 생체신호 측정거리를 8m이상으로 늘릴 수 있는 시스템이다. 제안된 시스템을 실험을 통하여 타당성을 검증한 결과 정상적으로 측정이 가능하였다. As Single households increases for reason of communication development, extending human life, there are many problems occuring all over the world. In order to solve this problem with an invasion of privacy and manintain a healthy life, this paper suggest non-contact type bio-signal measurement system using IR-Radar, displacement sensor and Pan-Tilt system. The proposed system can increse the distance of measured respiration from 1m to over 8m, which is comprised of two IR-Radar for location tracking, one displacement sensor for non-contact type bio-signal measurement and one stepping motor drive system. The proposed system is verified through experiments and were confirmed the possibility.