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Amyloid Deposits and Idiopathic Normal-Pressure Hydrocephalus: An <sup>18</sup>F-Florbetaben Study
Kang, Kyunghun,Yoon, Uicheul,Hong, Jinwoo,Jeong, Shin Young,Ko, Pan-Woo,Lee, Sang-Woo,Lee, Ho-Won S.Karger 2018 European neurology Vol.79 No.3
<P><B><I>Background:</I></B> The first aim of our study was to determine whether cortical <SUP>18</SUP>F-florbetaben retention was different between healthy controls and idiopathic normal-pressure hydrocephalus (INPH) patients. Our second aim was to investigate whether there were any relationships between <SUP>18</SUP>F-florbetaben retention and either hippocampal volume or clinical symptoms in INPH patients. <B><I>Methods:</I></B> Seventeen patients diagnosed with INPH and 8 healthy controls underwent studies with magnetic resonance imaging and <SUP>18</SUP>F-florbetaben positron emission tomography imaging. <B><I>Results:</I></B> Automated region-of-interest analysis showed significant increases in <SUP>18</SUP>F-florbetaben uptake in several brain regions in INPH patients compared to control subjects, with especially remarkable increases in the frontal (bilateral), parietal (bilateral), and occipital (bilateral) cortices. In the INPH group, right hippocampal volume was found to be negatively correlated with right frontal <SUP>18</SUP>F-florbetaben retention. Korean-Mini Mental State Examination scores negatively correlated with right occipital <SUP>18</SUP>F-florbetaben retention. Higher <SUP>18</SUP>F-florbetaben retention correlated significantly with a higher Clinical Dementia Rating Scale score in the right occipital cortex. <B><I>Conclusions:</I></B> Our results indicate that INPH might be a disease exhibiting a characteristic pattern of cortical <SUP>18</SUP>F-florbetaben retention. <SUP>18</SUP>F-florbetaben retention in the frontal cortex may be related to hippocampal neuronal degeneration. Our findings may also help us understand the potential pathophysiology of cognitive impairments associated with INPH.</P>
Kang, Kyunghun,Choi, Woohyuk,Yoon, Uicheul,Lee, Jong-Min,Lee, Ho-Won S. Karger AG 2016 European neurology Vol.75 No.1
<P>We investigated white matter integrity utilizing diffusion tensor imaging in patients with idiopathic normal-pressure hydrocephalus (INPH) who had a positive response to the cerebrospinal fluid tap test and in age- and gender-matched Alzheimer's disease (AD) patients. We enrolled 28 patients with INPH, 28 patients with AD and 20 healthy controls. Tract-based spatial statistics demonstrated that INPH patients had lower fractional anisotropy (FA) in the anterior corona radiate (bilateral), corpus callosum, superior longitudinal fasciculus (bilateral), posterior thalamic radiation (bilateral), external capsule (bilateral) and middle cerebellar peduncle in comparison with the AD and control groups. Volume-of-interest analysis revealed that INPH patients, when compared to the AD and control groups, showed higher mean diffusivity in the anterior corona radiate (bilateral), corpus callosum, superior longitudinal fasciculus (bilateral), posterior thalamic radiation (left), external capsule (bilateral) and middle cerebellar peduncle. And gait dysfunction was significantly correlated with decreased FA in the splenium of the corpus callosum and right external capsule in INPH patients. Our findings may suggest a possibility for considering microstructural changes in white matter integrity in elderly patients as potential imaging markers for differentiation between INPH and AD and may help us understand the potential pathophysiology of gait disturbances associated with INPH. (C) 2016 S. Karger AG, Basel</P>
Kang, Kyunghun,Hwang, Sung Kyoo,Lee, Ho-Won The Korean Neurosurgical Society 2013 Journal of Korean neurosurgical society Vol.54 No.5
The cerebrospinal fluid tap test (CSFTT) is recommended as a key step in the diagnosis of idiopathic normal pressure hydrocephalus (iNPH). While there is no generally accepted evaluation period for ascertaining a CSFTT responder, a substantial number of patients are evaluated only once within 24 hours of the test for improvement in gait. We report an iNPH patient with a favorable response to shunt surgery, who was first judged a non-responder by this standard, though subsequently was judged a responder in virtue of repetitively testing gait over 7 days. A 68-year-old man presented with progressive impairment of gait, balance, and memory. He was diagnosed as iNPH with an Evans' ratio of 0.35. At first hospitalization, change in gait was evaluated 24 hours after the CSFTT. He didn't show any significant improvement and was judged as a non-responder. However, at the second CSFTT, we repetitively tested his change in gait over seven days. Forty-eight hours after the tap, he showed significant improvement in his gait. He was then confirmed as a responder. After the operation, the gait difficulties were almost fully resolved. Further studies developing the standard procedure of the CSFTT should be considered.
설계하중에 대한 수상태양광 구조물 연결체의 응력발생 검토 연구
강경훈(KyungHun Kang) 한국해양환경·에너지학회 2021 한국해양환경공학회 학술대회논문집 Vol.2021 No.5
태양광발전은 다른 재생에너지 산업에 비해 큰 설치면적이 요구된다. 이 문제의 해결방안으로 유휴수면을 활용하는 수상태양광이 주목받고 있다. 수상태양광 발전 기술은 수면 위에 태양광발전 설비를 설치하는 기술로써 산지나 농경지의 훼손을 동반하지 않아 국토가 협소한 우리나라에 적합한 태양광에너지 기술이다. 현재 국내 운영중인 댐, 저수지, 소류지 등의 공유수면을 약 5%만 활용해도 약4GW 규모의 수상태양광 발전소를 건설할 수 있을 만큼 잠재력이 크다. 수상태양광 발전 구조물은 단위 구조물을 여러 개 결합시켜 하나의 커다란 구조로 만들어 계류장치로 결박 시킨다. 각 단위구조물이 연결되는 부분은 응력이 집중되기 때문에 매우 중요한 부분이다. 연결체가 잘못 설계되거나 시공될 경우 단위구조물이 수상에서 상실되거나 파손될 우려가 크기 때문이다. 이에 본 연구는 파랑하중, 풍하중, 설하중 등 설계 시 고려되는 하중에 의해 수상태양광 구조물 연결체에 발생되는 응력 발생정도를 검토하여 안전성을 확보하고자 하였다. Floating solar power technology is a technology that installs solar power facilities on the surface of the water. Solar power generation requires a larger installation area than other renewable energy industries. As a solution to this problem, The Floating solar power technology is in the spotlight. Using only about 5% of the shared water surface of dams, reservoirs operating in Korea, the potential is great enough to build a Floating solar power plant of about 4GW. The Floating solar power generation structure combines several unit structures to form one large structure and binds them with a mooring device. The part where each unit structure is connected is very important because stress is concentrated. This is because there is a high risk that unit structures will be lost or damaged on the water if the connections are incorrectly designed or constructed. Therefore, this study aimed to ensure safety by reviewing the stress generation on the connections of Floating solar power structures by the loads considered during design, such as wave load, wind load, and snow load.