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이두현,김현택,류재욱,김기석 한국심리학회 1990 한국심리학회지 생물 및 생리 Vol.2 No.1
해마에서만 발견되는 뇌전도는 낮은 주파수, 높은 진폭의 특징을 갖고 동기화가 잘 이루어져 마치 정현파에 가까운 형태를 보인다. 이러한 뇌전도에 대해 서파리듬 또는 θ파라 부르고 전기 생리학적인 연구가 많이 진행되고 있다. θ파의 주파수 특성, 발생기전, 행동과의 관련성 등에 대해 집중적 연구가 이루어졌고, 그러한 연구를 기초로 θ파의 기능에 관한 여러가설이 도출되었다. 본 연구에서는 이러한 해마의 서파리듬이 행동과 어떤 관계를 갖고 있는지를 알아보기 위하여 토끼의 순막반응을 고전적으로 조건화시키는 동안에 미리 해마에 삽입한 전극으로부터 뇌전도와 다단위활동을 기록하였다. 해마 서파리듬에 대해서는 주파수 분석을 실시하고 다단위 활동은 시간단위당 발화 횟수를 측정하여 조건화과정과의 관련성을 살펴보았다. 실험 결과, 해마의 다단위 활동은 순막의 조건 반응과 높은 상관관계를 보여주었다. 해마 서파리듬은 조건화 절차와 관계없이 조건자극, 무조건자극 제시 기간에 제2유형인 4,5㎐의 감소와 제1유형인 7,8㎐의 증가를 보였다. 이는 해마 서파리듬의 기능이 조건화된 반응보다는 조건자극과 무조건자극의 제시와 관련이 있음을 시사하는 것이었다. 이러한 결과를 해마 θ파의 기능에 관한 여러 가설에 비추어 논의하였다. This study was investigated to hippocampal θ rhythm and multiple unit response during classical conditioning of rabbit's nictitating membrane response. Hippocampal θ rhythm usually was classified into type 1 and type 2. According to various electrophysiological researches, type 1 θ rhythm was highly correlated with voluntary behavior and type 2 θ rhythm with automatic behavior, but there were studies which assert that type 1 θ rhythm was correlated with sensory information processing. So, this study was an attempt to investigate those results as compared paired conditioning group with unpaired control group. Paired group was presented 500msec tone CS followed 100msec air puff US after 400msec interstimulus interval. But unpaired group was presented 500msec tone and 100msec air puff independently. There was no difference in distinction of θ rhythm between the two group. Again, there was no correlation between θ rhythm and conditioned response. But, there was high correlation between multiple unit response and conditioned response. The result indicated that type 1 θ rhythm was highly correlated with presentation of tone and air puff in both group, this result suggest that type 1 θ rhythm is correlated with subject's information processing.
Kim, Hyun Jeong,Kim, Ji Eun,Choo, Jiyeon,Min, Jeonghee,Chang, Sungho,Lee, Sang Chul,Pyun, Woong Beom,Seo, Kwang-Suk,Karm, Myong-Hwan,Koo, Ki-Tae,Rhyu, In-Chul,Myoung, Hoon,Heo, Min-Suk Korean Academy of Oral and Maxillofacial Radiology 2019 Imaging Science in Dentistry Vol.49 No.4
Purpose: This clinical pilot study was performed to determine the effectiveness of dual-energy cone-beam computed tomography (DE-CBCT) in measuring bone mineral density (BMD). Materials and Methods: The BMD values obtained using DE-CBCT were compared to those obtained using calibrated multislice computed tomography (MSCT). After BMD calibration with specially designed phantoms, both DE-CBCT and MSCT scanning were performed in 15 adult dental patients. Three-dimensional (3D) Digital Imaging and Communications in Medicine data were imported into a dental software program, and the defined regions of interest (ROIs) on the 3-dimensional surface-rendered images were identified. The automatically-measured BMD values of the ROIs (g/㎤), the differences in the measured BMD values of the matched ROIs obtained by DE-CBCT and MSCT 3D images, and the correlation between the BMD values obtained by the 2 devices were statistically analyzed. Results: The mean BMD values of the ROIs for the 15 patients as assessed using DE-CBCT and MSCT were 1.09±0.07 g/㎤ and 1.13±0.08 g/㎤, respectively. The mean of the differences between the BMD values of the matched ROIs as assessed using DE-CBCT and calibrated MSCT images was 0.04±0.02 g/㎤. The Pearson correlation coefficient between the BMD values of DE-CBCT and MSCT images was 0.982 (r=0.982, P<0.001). Conclusion: The newly developed DE-CBCT technique could be used to measure jaw BMD in dentistry and may soon replace MSCT, which is expensive and requires special facilities.
전자기 유도방식의 부상력을 이용한 오프 더 그라운드 모빌리티용 구동모듈 기술개발
이기덕(Ki-Doek Lee),서정무(Jung-Moo Seo),유세현(Se-Hyun Rhyu) 대한전기학회 2022 전기의 세계 Vol.71 No.7
전자기 유도(Electromagnetic Induction)현상을 기반으로 부상력을 발생시켜 자유롭게 이동할 수 있는 퍼스널 모빌리티용 자기부상 구동모듈 기술. Magnetic levitation driving module technology for personal mobility that can move freely by generating levitation force based on electromagnetic induction.
EVALUATION OF BONE RESPONSE BY RESONANCE FREQUENCY ANALYSIS OF ANODIZED IMPLANTS
Roh Hyun-Ki,Heo Seong-Joo,Rhyu In-Chul The Korean Academy of Prosthodonitics 2005 대한치과보철학회지 Vol.43 No.6
Statement of problem. Resonance frequency analysis has been increasingly served as a non-invasive and objective method for clinical monitoring of implant stability. Many clinical studies must be required for standardized data using RFA. Purpose. This study was performed to evaluate RFA value changes in two anodized implant groups. Material and method. Among a total of 24 implants, twelve screw shaped implants as a test group (H2-R8.5) were manufactured, which had a pitch-height of 0.4 mm, an outer diameter of 4.3 mm, a length of 8.5 mm, and external hexa-headed, were turned from 5 mm rods of commercially pure titanium (ASTM Grade IV, Warantec Co., Seoul, Korea), and another twelve implants as a control group were $Br{\aa}nemark$ Ti-Unite MK4 (diameter 4.0 mm, length 8.5 mm). Each group was installed in tibia of rabbit. Two implants were placed in each tibia (four implants per rabbit). Test two implants were inserted in right side and control two in left side. ISQ values were measured using $Osstell^{TM}$ (Integration Diagnostics Ltd. Sweden) during fixture installation, and 12 weeks later and evaluated the RFA changes. Results. Mean and SD of baseline ISQ values of test group were $75.0{\pm}3.4$ and $68.7{\pm}8.1$ for control group. Mean and SO of ISQ values 12 weeks after implant insertion were $73.2{\pm}4.7$ for test group and $72.6{\pm}3.9$ for control group. There were no statistically significant differences between groups in ISQ values after 3 months (P>0.05). From the data, RFA gains after 3 months were calculated, and there was statistically significant difference between groups (P<0.05). Conclusion. Although there were RFA changes between groups, implant stability after experimental period shows alike tendency and good bone responses.