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반도성 $BaTiO_3$ 세라믹스의 미세구조 및 PTCR 특성에 미치는 $MnO_2$ 첨가 효과
김준수,김홍수,백남석,이병하 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.5
The effect of MnO2 addition to 0.1mol% Sb2O3-doped BaTiO3 ceramics on microstructure and PTCR characteristics was studied. The PTCR characteristics was observed when 0.01 and 0.02 wt% MnO2 were added and sintered at 132$0^{\circ}C$ for 1 hour. The characteristics can be explained by the changes in the number and size of the abnormal grain growth due to the liquid phase during sintering. when the amount of MnO2 addition was 0.03 wt%, the sample showed NTCR characteristics with room-temperature resistivity over 109 Ωm regardless of the sintering temperature. This behavior can be described by the microstructure change due to the abnormal grain growth and charge compensation effect by MnO2 added. The room-temperature resistivity was increased as the amount of MnO2 was increased. And the specific resistivity ratio (pmax/pmin) showed maximum at 0.02wt% MnO2.
척추 분리증과 경도의 척추 전방 전위증에 대한 수술적 치료
김준수,황수현,김은상,박용규,백선하,박인성,정진명,한종우 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.8
As an alternative method to posterior fusion techniques to eliminate a motion segment, a modified repair of a defect in spondylolysis or minimal isthmic spondylolisthesis. by pedicle screw, segmental wire fixation and bone graft(a modified Scott method) had been done. There were seven patients who underwent modified Scott technique Two had only spondylolysis or grade I spondylolisthesis of the isthmic type. Three had spondylolysis with herniated intervertebral disc. One had L5 spondylolysis with spondylolisthesis in the L4-5 level. The other patient had instrument failure with S1 spondylolysis All patients underwent the modified Scott method, consisting of tension wire banding around the spinous process and a short cortical screw in the pedicle, or other procedure for their accompanying spinal disease. All patients experienced disappearance or decrease of low back pain soon after operation. The authors believe that this technique offers the advantages of maintaining all motion segments and avoiding the risks of damaging the exciting nerve root just beneath the transverse process during the Scott method reported by Richard.
김준수,김정엽,현기호 영산대학교 2004 영산논총 Vol.13 No.-
The development and spread of multimedia services require authentication techniques to prove the originality and integrity of multimedia data and to localize the alterations made on the media. A wide variety of authentication techniques have been proposed in the literature. In this paper, We study the embeding watermark of the compressed video sequence for copyright protection. We does compare and analyse two watermarking method using spread spectrum scheme in DCT frequence domain. This methods that the object detect using motion vector and transformation of codeword in VLC domain is show the robustness to the attacks like average operation or statistical analysis.
자동화 생산기술에서 자기학습 및 창의적 문제해결 촉진을 위한 통합적 학습방안 연구
김준수 한국기술교육대학교 2002 論文集 Vol.9 No.1
Since a pretty long years ago all of machines and equipments are connected and controlled in one automatized production system, the electricians in the production field should understand the interaction among the electrical and mechanical components of the production process, and also be able to recognize the small change and the results in the whole system. The technical subjects should be then integrated with the working process in the same production field for the training students. It must be also trained so that the students might be able to analyse the technical problems in the economical and ecological perspectives. They are often confronted with the new situations, in which they should collect the related practical and technical informations and try to reconstruct their knowledge for creative problem-solving in the confronted situations. The students should be also trained so that they might be able to objectively collect and arrange the information in the appropriative knowledge-structuring system for problem-solving. It is studied here on the structuring of learning contents for the practice-oriented electrical training in the field of automatized production, in which the student could learned the knowledge-structuring method for the new problem-solving. These learning steps are made up with the following learning process; analysis of the confronted situation and recognition of the problem, knowledge coding for knowledge-structuring, setting-up the strategy for knowledge-structuring, idea finding, application and verification, reporting and evaluation.