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골격성 III급 부정교합자의 체질량지수에 따른 술후 연조직 변화
김은철,이상철,Kim, Eun-Cheol,Lee, Sang-Chull 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.3
This study has been carried out in order to measure the thickness of soft-tissue on lateral cephalographs based on body mass index(BMI) and the change in soft-tissue thickness after surgical correction of mandibular protrusion. The control material in cephalometric study comprised students at The Dental College, 38 persons, aged 21~24 years and the patient material comprised 20 women and 12men, aged 19~28 years with mandibular protrusion.The thickness of the soft-tissue based on BMI in control and study groups, the comparison between them, immediate postoperative change in the thickness, 6 months after surgery, ratio of soft-tissue response and correlation was established through various statistical methods. The result were as follows : 1. The groups based on BMI showed significant differences each other as regards the linear measurements. The thickest soft-tissue was measured 13.6mm, 15.47mm, 16.76mm at Ss, the thinnest at G' 6.0mm, 6.7mm, 7.26mm respectively. 2. The differences between control and experimental groups based on BMI showed to be significant. There were no differences at G'. The soft-tissue in prognathic patients was thicker at Ss, Ls and thinner at Li, Ls, Pg', Gn', Me'. Differential gap was greater in overweight groups. 3. The immediate soft-tissue change after surgery showed the increase at Li, Ls, Pg', Gn', Me' except G', Ls in all groups. 4. The postoperative soft-tissue change 6 months after surgery was similar with immediate change. The soft-tissue shows the increase in the thickness at Li, Pg', Gn', Me' and the greatest difference occurred at Li, 1.1mm, 0.98mm, 1.2mm respectively. 5. The patients with lower BMI index showed higher soft-tissue response to bony movement at Pg'. The immediate response ratio was 91%, 87%, 81% in A,B,C groups respectively, the response 6 months after surgery showed 96%, 91%, 84%.
김은철,Kim, Eun-Cheol 사단법인 한국당뇨협회 2008 당뇨 Vol.221 No.-
당뇨병은 인슐린 분비 부족이나 내성에 의해 체내의 고혈당이 생기는 질환으로 주로 미세혈관계에 이상이 발생하여 우리 몸의 모든 곳에 합병증이 생기는 질환이다. 당뇨로 인한 합병증이 주로 나타나는 곳은 신경, 콩팥, 그리고 눈이며 특히 최근에 선진국에서 실명의 가장 큰 원인은 당뇨병성 망막증이다. 당뇨로 인하여 생기는 눈의 변화는 각막진무름, 백내장, 녹내장, 망막증, 외안근마비, 시신경염 등 다양하게 나타날 수 있으며 조기에 치료하지 않으면 결국 실명에 까지 갈 수 있는 무서운 결과를 초래한다.
순환천이변조 주파수도약대역확산/시분할다중접속 시스템의 성능 개선에 관한 연구
김은철,김승춘,이형근,Kim, Eun-Cheol,Kim, Seung-Chun,Lee, Hyung-Keun 한국전기전자학회 2012 전기전자학회논문지 Vol.16 No.1
In this paper, we propose to employ a ternary sequence as a cyclic code shift keying (CCSK) modulation sequence. And we simulate the performance in a frequency hopping spread spectrum/time division multiple access (FHSS/TDMA) system with CCSK. Wireless channel is modeled as Rayleigh fading channel. From the simulation results, it is demonstrated that the system adopting the ternary sequence as a CCSK sequence has higher performance than that with a random sequence. 본 논문에서는 순환천이변조 (CCSK: cyclic code shift keying) 시퀀스로 삼진 시퀀스를 적용하는 것을 제안하였다. 그리고 순환천이변조를 적용한 주파수도약대역확산/시분할다중접속 (FHSS/TDMA: frequency hopping spread spectrum/time division multiple access) 시스템에서 성능을 모의실험 하였다. 실험에서 무선 채널은 레일레이(Rayleigh) 페이딩 채널로 모델링하였다. 모의 실험 결과로부터 순환천이변조 시퀀스로 무작위 시퀀스를 사용한 시스템보다 삼진 시퀀스를 적용한 시스템이 더 높은 성능을 보이는 것이 증명되었다.