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SON(Self Organizing Network) 기술 동향
박경민,고정하,윤강진,김영용 한국통신학회 2010 정보와 통신 Vol.27 No.8
본고에서는 통신 기술 발전에 따라 다양화되고 복잡화되는 통신시스템을 효율적으로 관리할 수 있는 SON 기술에 대하여 기본적인 개념을 파악하고, 최근 각 표준화 그룹에서 진행되고 있는 관련 연구내용들을 구체적으로 조사 및 분석한다. 또한 이들 중 주목할 만한 몇 가지 기술들에 관하여 기술함으로써 향후 이동통신 시스템을 위한 SON 기술개발에 있어 기초적인 연구 방향을 제시한다.
권준철,정용규,고정하 한국정보통신설비학회 2016 한국정보통신설비학회 학술대회 Vol.2016 No.09
Evaluation and rating for Smart City is going on in the world. The evaluation indicators known to the world are SSC-KPI and ITU-T indicators. But it is need special way for the attainment of the required indicators. European smart city ranking evaluation index is evaluated by reference to the city of Humanities and Social Assessment Report unrelated to IT such as nation from the city's target rating. However, quantitative evaluation in an objective according to the European Smart City ranking and ITU-T SSC-KPI indicators of is believed unlikely. In this paper, we promoted the idea in a useful way that it can ensure the sustainability of the city to take advantage of the information gathered by the information gathering and various routes of the city each part of utilizing IT and the National Informatization local information, ubiquitous city. It would come to pursue such a policy.
김환,임은극,고정하,황규홍,Kim, Hwan,Lim, Eung-Keuk,Koh, Jeong-Kyu,Hwang, Kyu-Hong 한국세라믹학회 1984 한국세라믹학회지 Vol.21 No.3
The effect of tetragonal $ZrO_2$ phase on the mechanical behavior in 7 mole% calcia partially stabilized zirconia has been studied. The $ZrO_2$ powder containg 7 mole% CaO prepared by Hot Petroleum Drying Method calcined at 80$0^{\circ}C$ for 1 hour was nearly 100% tetragonal but as the calcining temperature increased certain amount of monoclinic phase appeared. The sintered specimen at 1$700^{\circ}C$ for 5 hours was aged at 130$0^{\circ}C$ for 0, 24, 48, 72 hours. X-ray diffraction data showed that in the aged specimen monoclinic tetragonal and cubic phase coexisted. The Kc value of aged specimen for 48 hr was about 4.5MN/m3/2 much greater than unaged sample. But aged for 72 hr the KiC value was decreased. The increasing of toughness in PSZ is based on the Stress-Induced Phase Transformation that is metastable tetra-gonal $ZrO_2$ changes t stable monoclinic phase within the stress field of crack and the mechanical fracture energy absorption is occured But in this case due to certain amount of tetragonal phase transformed to monoclinic phase during cooling the microcrack effect by transformation also considered. Trerefore both Stress-Induced Phase Transformation and inclusion induced microcracking effect contrbute to the increase of fracture toughness of 7 mole% CaO-$ZrO_2$ containing monoclinic and tetragnola phase simulataneously.