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수직자기기록용 Co - Cr - Ta 박막의 자기적 성질에 대한 연구
황충호(C. H. Hwang),박용수(Y.S. Park),장평우(P. W. Jang),이택동(T. D. Lee) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.1
Effects of Ta addition on Co-Cr pependicular magnetic recording media were studied to obtain high perpendicular coercivity at lower substrate temperature. For the purpose, magnetic properties and microstructures of Co-Cr-(Ta) films were studied by varying the Cr contents from 17 to 21 at. % and Ta contents for 0 to 3.2 at. %. Effectiveness of Ta addition in increasing perpendicular coercivity was significant for lower Cr content films. The increasement of perpendicular coercivity was more pronounced for the films deposited on 100℃ heated substrate in the case of (Co_(83)Cr_(17))_(98.4)Ta_(1.6) composition. The cause of the increase of perpendicular coercivity was considered due to not the grain refinement effects and the improvement of c-axis alignments but increase of Ta and Cr segregation.
Co - Cr - (Ta) 수직자기기록용 박막의 자기이방성에 대한 연구
황충호(C. H. HWANG),박용수(Y. S. PARK),신경호(K. H. Shin),이택동(T. D. Lee) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
In order to investigate the origin of an increase in the coercivity with the Ta addition to Co-Cr films, the perpendicular magnetic anisotropy of Co-Cr film and CoCrTa film was measured by a torque magnetometer and VSM. In Co-Cr binary alloy film, the uniaxial anisotropy increased with increasing Cr content. The perpendicular magnetic anisotropy of CO_(81.7)Cr_(16.7),Ta_(1.6) film was larger than that of CO_(81)Cr_(19) film, both of which were deposited at the same substrate temperature of 100 ℃. The change in the perpendicular magnetic anisotropy with annealing was studied to understand the Ta addition effect. The amount of decrease in perpendicular magnetic anisotropy of the CoCrTa film by the annealing was larger than that of Co-Cr film. And the perpendicular magnetic anisotripies of Co-Cr film and CoCrTa film after annealing were almost the same. The cause of this was interpretated as the enhanced segregation of solute atoms in the Ta added thin film in the as-deposited state. The enhanced segregation of solute atoms increases the perpendicular magnetic anisotropy of the film, and causes the increase of perpendicular coercivity of the film.
이순영,황충호,남영호 한국지식정보기술학회 2020 한국지식정보기술학회 논문지 Vol.15 No.5
The aviation software is developed by dividing the object code part and the parameter part into files. This is because various parameters need to be corrected for optimized flight control, so it is possible to correct only by modifying the parameter file without changing the configuration of the object code. As a result, if the changed parameter is within the valid range proved by the test for the code, the test cost can be reduced because the test for the code verification is unnecessary. These parameters are referred to as Parameter Data Items(PDI) in DO-178C, the standard for aviation software conformance. The conversion of this PDI into a binary file is called PDIF. In this paper, We design and implement a PDIF converter that generates an Excel sheet gain set with various flight scenarios for flight control law data and converts it into a PDIF set. The implemented PDIF converter can perform flight test without changing its configuration when a test is applied to the dynamic environment of Hardware In the Loop Simulation(HILS) for flight safety. The use of the Converter improves test convenience and saves test time as it enables continuous testing of various flight scenarios through PDIF set without interruption compared to the conventional sequential test for each single flight scenario. In addition, the (.dat) file can apply to other types of OFP and reduce the impact of OFP modification.
비행 제어 데이터 시험을 위한 디버거용 C 코드 생성기의 설계 및 구현
이순영,황충호,남영호 한국지식정보기술학회 2022 한국지식정보기술학회 논문지 Vol.17 No.6
Currently, society has improved the quality of human life due to rapid technological development and widely uses complex and sophisticated systems to operate high-tech industries. Testing is increasingly crucial as software becomes more critical, especially in developing safety software. It must perform system and software testing to prevent casualties and significant accidents and minimize system problems. Various guidelines for aviation software certification have been established in aviation. In general, it is desirable to perform in a hardware-in-the-loop-simulation (HILS) environment to test the requirements related to control based on DO-178C and DO-330. However, configuring the HILS test environment takes time and money. In this study, Control Law Test data(CLT) Generator was designed and implemented to generate c-formatted structures and codes using flight control test data (.csv) files generated by MATLAB's Simulink to reduce the time and cost of building a test environment. The generated c-type structures and codes may load customized flight control test data on target equipment for high-level testing. It is not necessary to directly modify the code to various target test equipment such as iSYSTEM Debugger to meet the requirements of the test environment for the target, thereby improving the convenience of the test. It can also use the generator for various equipment tests in a test drive environment of type c.