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$Mn_{0.05}Mg_{11.9-2x}Fe_{4x}O_{4+r}$+2wt%$Al_{2}O_{3}$ 조성내 Fe량 변화에 따른 마이크로파 손실 특성 연구
김성재,정명덕 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.6
In order to study the effect of D.C resistivity of sample on electromagnetic loss of ferrite at microwave frequency, samples were prepared for having differences in resistivity of an order of two. Microwave permeability($\mu$), permitivity($\varepsilon$) and effective linewidth(${\Delta}H_{eff}$), and ferromagnetic resonance linewidth(${\Delta}$H) were characterized. Tan${\delta}{\mu}$, tan${\delta}{\varepsilon}$ and ${\Delta}H_{eff}$ were decreased with increasing the resistivity and (${\Delta}$H) was increased with increasing Fe concentration, which was due to an increase of anisotropy magnetic field (=Ha).
지진대응 교육 및 훈련을 위한 Serious Game 시나리오 설계방법론 개발 - 경상북도를 사례로 -
김성재,최지향,남광현 한국재난정보학회 2021 한국재난정보학회 논문집 Vol.17 No.4
연구목적: 지진재난은 다양한 변수와 돌발상황들로 예측할 수 없는 상황이 빈번하게 발생하게 때문에 업무과정 자체가 일률적이지 못해 재난안전부서 공무원들은 지진 대응 행동 매뉴얼 숙지에 어려움을 겪고 있다. 이에 본 연구는 경상북도청 재난안전대책본부에 한하여 이루어지고 있는 현재의 업무 상황을 구 체적이고 정확하게 파악하여 업무 진행 과정에 필요한 매뉴얼 학습의 시리어스 게임 시나리오 설계방 안을 제시하고자 한다. 연구방법: 본 연구에서는 GBS(Goal Based Scenarios)모형을 기반으로 시나리오 를 설계하고, 경상북도 재난 현장조치 행동 매뉴얼을 기반으로 미션과 역할을 부여하는 과정에서 경상 북도청 지진관련 공무원들이 실제적인 과제를 해결하는 지식과 기능을 습득할 수 있도록 하였다. 연구 결과: 제안된 기법의 시나리오 데이터는 지진관련 다양한 정보를 논리적 데이터로 가공하여 지진상황 훈련을 위한 게임상 표현을 위하여 단순화, 추상화하여 체계적인 절차로 구현하였다. 결론: 시리어스 게임을 통한 학습으로 지진 상황 발생 시, 경상북도청 재난안전대책본부의 관련 공무원들은 다양한 지 진재난에 신속한 대응이 가능할 것으로 기대된다. Purpose: Earthquake disasters are frequently occur unpredictable situations due to various variables and unexpected situations. As a result, the work process itself is not uniform, making it difficult for public officials in the disaster safety department to familiarize themselves with the earthquake field manual. This paper is specifically and accurately grasp the current work situation conducted by the Disaster and Safety Countermeasures Headquarters of the Gyeongsangbuk-do Office and present a plan for designing serious game scenarios necessary for field manual learning. Method: In this study, scenarios were designed based on the GBS(Goal Based Scenario) model, and in the process of assigning missions and roles based on the Gyeongsangbuk-do earthquake field manual, public officials related to earthquakes were able to acquire knowledge and skills to solve practical tasks. Result: Scenario data of the proposed technique was implemented as a systematic procedure by processing various earthquake-related information into logical data and simplifying and abstracting it for game expression for earthquake situation training. Conclusion: In the event of an earthquake due to learning through serious games, related public officials of Gyeongsangbuk-do provincial are expected to be able to respond quickly to various earthquake disasters.
자가 슬개건을 이용한 전방십자인대 재건술 후에 발생한 슬개골 골절 - 4례 보고 -
김성재,최용기,전철홍,최정기,이춘택 대한슬관절학회 2000 대한슬관절학회지 Vol.12 No.2
Autogenous bone-patellar tendon-bone is popular ligament substitute used in anterior cruciate ligament(ACL) reconstructions. Fracture of the patella is a rare but serious complication unique to this type of reconstruction. We report 4 cases of patellar fracture after autogenous bone-patellar tendon-bone ACL reconstruction.
유리결정화에 의한 Ferroxplana Ba2Zn2Fe12O22 미세 단결정의 제조
김성재,김동호,김태옥 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.10
As the fundamental research of preparation of fine single crystalline ferroxplana by means of glass-crystallization methods using steel twin-roller the properties of ferroxplana extracted from cyrstallized glass were studied. Most of all the specimens quenched by twin-roller at about 1350$^{\circ}C$ were glass phase, the crystallization of these glass had multi-steps and ferroxplana phase was only stable untill 900$^{\circ}C$, began to be decomposed from about 950$^{\circ}C$ in glass. The morphology of particle could be controlled by the composition and crystallization condition, and Zn2+ was replaced by reduced Fe2+ which is 2∼3% contents of total Fe. Ferroxplana extracted had such magnetic properties as Ms=34 emu/g, mHc=10 Oe and Curie Temperature, Tc=425K.
공침법에 의한 $\delta$-FeOOH의 제조 및 자기 특성
김성재,김태옥 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.3
$\delta$-FeOOH was prepared by rapid oxidation method of Fe(OH)2 using H2O2. The effects of reaction temperature and mole ratio ([OH-]/[Fe2+])의 몰비를 제조 변수로 하여 최종 생성된 $\delta$-FeOOH의 입자크기 입자형태, 자기특성을 조사하였다. Fe(OH)2 의 반응온도 및 [OH-]/[Fe2+] 비가 $\delta$-FeOOH의 입자크기 및 형상에 많은 영향을 미침을 알수 있었으며 입자 크기는 이 두인자에 비례하여 증가하였다 Fe(OH)2 의 반응온도가 4$0^{\circ}C$ [OH-]/[Fe2+]=5 Fe(OH)2 숙성 시간 2시간에서 제조된 $\delta$-FeOOH를 TEM, VSM으로 입자의 크기 및 자기특성을 조사한결과 평균 입경이 630$\AA$ 정도이고 입도 분포가 양호하였으며 포화자화 및 보자력은 각각 20.8emu/g 210 Oe였다.
원료 분말의 혼합 시간에 따른 소결 Mg-Ferrite의 전기.자기적 특성 변화
김성재,백종규 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.3
As the results of the study on the effects of mixing time for raw materials to the electric and magnetic properties of Mg-ferrite, the fraction of spinel phase after calcination and the geometry density of sintered Mg-ferrite increased from 30% to 100% and from 2.5g/cc to 4.25g/cc respectively due to mixing-homobenity of raw materials. The AC resistivity of grains decreased and lattice parameter, saturation magnetization increased due to the increase in Fe+2 of sintered body. conclusively the characteristic of powder after calcination had strong influence on the microstructure, electric, and magnetic properties in Mg-ferrite sintered body.
미세 구조가 Mg-페라이트 소결체의 자성에 미치는 영향
김성재,정명득,백종규 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.4
Effects of microstructure of two Mg-ferrite specimens with the same starting composition and relative density but with different grain size on B-H hysteresis loop, natural resonance frequency, and ferromagnetic resonance line width are reported. Such properties as B-H hysteresis loop, saturation magnetization, natural resonance frequency, and ferromagnetic resonance line width were influenced by the microstructure development during sintering. Large grain size specimen showed high saturation magnetization, low coercive force, low natural resonance frequency, and low ferromagnetic resonance line width compared with the specimen of small grain size. The main reason for the changes in properties can be explained by the variation in anisotropic characteristics due to Fe+2 content generated during sintering process.