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SrTiO₃첨가에 따른 (x)BaTiO₃-(1-x)SrTiO₃의 유전적, 전기적 특성
정해덕,장동환,김덕근,홍경진,최창주 木浦大學校 工業技術硏究所 1998 工業技術硏究誌 Vol.8 No.-
In this paper, a ferroelectric material BaTiO3 was added to SrTiO3, then (x)BaTiO3-(1-x)SrTiO3(0.7≤x≤1) ceramics were fabricated with stable electrical properties in high voltage. Microstructures and electrical properties were investigated according to mixing conditions of addition material SrTiO3. As a result of the investigation of all experiments, the shrinkage was excellent in 0.9BaTioO3-0.1SrTiO3. The grain size was increased, the curie temperature was shifted low temperature. The 0.9BaTiO3-0.1SrTiO3 was appeared stable property in temperature vs. permittivity. Also, 0.9BaTiO3-0.1SrTiO3 was showed stable dielectric properties at 25~85[C]. V-I properties of specimen were observed in the temperature range of 21~143[C], were divided into three regions. the region I below 10[kV/cm] was shown Ohmic conduction, the region II from 10 to 30[kV/cm] was explained by the poole-Frenkel emission theory and the region III above 30[kV/cm] was analysed by the tunneling effect.
박동만,이정윤,김경택,손성근 대한골절학회 1994 대한골절학회지 Vol.7 No.2
A pilon fracture, which is defined as a comminuted intraarticular fracture of distal tibia, involve the articular surface and metaphysis with occasional extension in the diaphysis. The management has been notoriously difficult due to the associated injury, intraarticular fracture, severe communition of distal tibia, joint incongruity and soft tissue trauma. Most authors has reported good results after a surgical treatment by a priociple of AO group treatment. Rescently, Bone et all reports that ROM and outcomes of the severly comminuted or open fractures of the distal intraarticular tibia were very good in using the external fixator. The result of treatment of 22 cases were analysed at the Department of Orthopedic Surgery, Dong-A University hospital from Mar. 1990 to Feb. 1993. The results were as follows; 1. The incidence of pilon fracture is 8.3% of all anlle fracture treated during same period. 2. The most common cause of injury is fall down(63.3%). 3. The most frequent type is type 3 (54.6%).(by Rudei & Allgower) 4. The most common associated injury is compression fracture of spine and calcaneal fracture(4 cases) 5. There are eight cases open Pilon fracture(36.3%) 6. We had treated severe communited fracture and open fracture by using external fixator, we achived good ROM and outcomes. 7. The more accurate reduction, the better clinical result. 8. Complication of the Pilon fracture were traumatic arthritis, non-union, malunion, wound int, etc.
박동만,이정윤,김경택,손성근,김성수 대한골절학회 1995 대한골절학회지 Vol.8 No.1
The lateral condyle fracture of humerus in children is the second most common fracture among the elbow fractures. In dealing with this fracture, we have frequently encountered the various complications due to physeal plate and intraarticular involvement. Change of the carrying angle is one of the common complications, but many authors reported different results about the change of carrying angle. Also, it is too difficult to measure the carrying angle during the early stage of the treatment because of cast immobilization, motion limitation of elbow, and wide variations of radiologic carrying angle according to elbow position changes. We performed this study to find the more stable and predictable new radiologic measuring mothod about the carrying angle, and then analysed the factors affecting the changes of carrying angle of the 23 patients of the lateral condyle fractures of the humerus in children who were treated and followed up more than twelve months at the Department of Orthopaedic Surgery, Dong-A University Hospital from May 1990 to April 1993. The results were as follows. 1. Carrying angles by Beals method showed variable values according to the elbow positions, but A-angles by the new measuring method were relatively stable repudless of the elbow positons. 2. Increase of clinical carrying sngle was 3 cases, decrease was 9 cases, and ranges of clinical carrying angle change were from -7 degress to +4 depees. Imease of A-angle was 7 cases, decrease was 4 cases, and ranges of A-angle change were form -10 degrees to +10 degrees. 3. The change of carrying angle showed no correlation with Jacob stage, follow up duratian, metaphyseal height and interval between injury and treatment. But the incidence and the amount of carrying angle change were increased accarding to the inaeaaed age at injury(r=0.62, P$lt;0.01). 4. Tbere were statistical significant correlation(r= -0.65, P$lt;0.01) and regreasion between the change of carrying angle and A-angle: Y -0.99X + 0.56(Y:change of clinical carrying angle, X: A- angle change), (r2=0.42, P$lt;0.01).
全北地域의 人口의 長期 豫測 : A modle of Chonbuk
徐東均,朴正根 全北大學校 1990 論文集 Vol.32 No.-
In this paper the population of Chonbuk province is projected by the survival method. The population projection is the essential factor to establish the long-run developing plan for regional economy. The accuracy of the estimated population is required to accomplish the developing plan efficiently. The estimated population (1990-2001) will be 2,172,015(1990),2,169,948(1995) and 2,247,593(2001) respectively. In the characteristics of population structure, the portions of the young age(0―14) and the old age(60―) to the total population will be over 23% and 13% in 2001. The population structure of Chonbuk will change to the types of the developed country step by step. When the decrease of the young age group and the increase of the old age group are anticipated, the welfare plan for the old age will be gradually required. The rapid decrease of Meon-level population results in the lack of labor forces in rural area. The counterplan to it should be considerated.