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Effect of Anti-glaucoma Agents on Myopic Retinoschisis
Kyuhwan Jang,Junghwa Lee,Kyungmin Lee,Mi Jeung Kim,Joonhong Sohn 대한안과학회 2020 Korean Journal of Ophthalmology Vol.34 No.6
Purpose: To evaluate the effect of intraocular pressure (IOP)-lowering medications on myopic retinoschisis. Methods: The medical records of 33 patients (36 eyes) with myopic retinoschisis associated with pathologic myopia werereviewed retrospectively. The patients were divided into two groups: the study group comprising patients undergoing treatmentwith anti-glaucoma medications for suspected glaucoma; the control group comprising patients who did not use anyIOP lowering medications. The changes in retinoschisis in the two groups were compared using the Spectralis domain opticalcoherence tomography thickness map protocol. Results: The study group included 18 eyes (17 patients), and the control group included 18 eyes (16 patients). There were nosignificant differences between the 6-month and 12-month improvement or aggravation rates of the two groups (p = 0.513and 0.137, respectively). However, after 18 months, the aggravation rate of retinoschisis was significantly lower in the studygroup (p = 0.003). The improvement / aggravation rate was 58.33% / 16.67% in the study group and 0% / 57.14% in the controlgroup. Conclusions: The use of IOP-lowering medications for more than a year may be useful for the management of retinoschisisassociated with pathologic myopia.
다중 안테나 다중 사용자 환경에서 최대 전송율에 근접하는 선형 precoding 기법
장승훈(Seunghun Jang),양장훈(Janghoon Yang),장규환(Kyuhwan Jang),김동구(Dong Ku Kim) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.4C
본 논문은 최대 전송률에 가까운 성능을 보이는 선형 precoding 기법을 제안한다. MMSE precoding은 ZF precoding 방식보다 우수한 평균 자승 오차 성능을 가진다. 반면 MMSE precoding 방식의 전송률은 낮은 SNR 범위에서는 ZF 방식에 비해 개선된 성능을 보여주지만 높은 SNR에서는 오히려 성능 열화현상을 보인다. 이와 같은 사실에 착안하여 본 논문에서는 최대 전송률에 근접하는 선형 precoding 기법을 제안한다. 제안된 방식은 ZF precoding방식에서 사용되는 역행렬 연산을 전송율이 최대화될 수 있도록 정규화하는 방식이고 이를 위한 간단한 수치 알고리즘이 제안된다. 또한 그 과정에서 낮은 복잡도를 가지는 간단한 전력 재할당에 의한 정규화 방식이 제안된다. 시뮬레이션과 성능분석을 통해 제안된 방식이 모든 SNR 범위에서 기존의 ZF precoding 방식과 MMSE precoding방식보다 높은 전송률을 가짐을 보인다. 또한 제안된 방식은 채널 추정 오차가 존재하는 경우에도 기존의 선형 precoding 방식들과 비교하여 성능 이득을 유지하면서 채널 추정 오차에 강인함을 가진다. This paper considers a linear precoding scheme that achieves near optimal sum rate. While the minimum mean square error (MMSE) precoding provides the better MSE performance at all signal-to-noise ratio (SNR) than the zero forcing (ZF) precoding, its sum rate shows superior performance to ZF precoding at low SNR but inferior performance to ZF precoding at high SNR, From this observation, we first propose a near optimal linear precoding scheme in terms of sum rate. The resulting precoding scheme regularizes ZF precoding to maximize the sum rate, resulting in better sum rate performance than both ZF precoding and MMSE precoding at all SNR ranges. To find regularization parameters, we propose a simple algorithm such that locally maximal sum rate is achieved. As a low complexity alternative, we also propose a simple power re-allocation scheme in the conventional regularized channel inversion scheme. Finally, the proposed scheme is tested under the presence of channel estimation error. By simulation, we show that the proposed scheme can maintain the performance gain in the presence of channel estimation error and is robust to the channel estimation error.
Lee, Chaeyeon,Jose, Leeja,Shim, KyuHwan,An, Seong Soo A.,Jang, Sunah,Song, Jae Kwang,Jin, Jun-O,Paik, Hyun-jong The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.29
<P>Stimulation of dendritic cells (DCs) by antigens (Ags) promotes an Ag-specific immune response that kills Ag-expressing pathogens. These biologically inspired nanocarriers have received much attention as tools to deliver cancer Ags to DCs. A polymer-templated protein nanoball having hemagglutinin (H1-NB) that mimics the influenza virus can be used as a cancer Ag delivery vehicle, as DCs show effective phagocytic activities against H1-NB without any adjuvant. In the present study, H1-NB containing ovalbumin (OVA), a model Ag (H1-OVA-NB), was prepared as an anti-cancer agent and evaluated for its effect on anticancer immunity. H1-OVA-NB treatments in C57BL/6 mice enhanced OVA-specific immune activation and efficiently inhibited B16-OVA tumor growth compared to control groups. Our results indicate that H1-NB is an effective carrier for Ag delivery to DCs and promotes immunotherapy to fight cancer.</P>
Virus-mimetic polymer nanoparticles displaying hemagglutinin as an adjuvant-free influenza vaccine
Lee, Chaeyeon,Jeong, Jonghwa,Lee, Taeheon,Zhang, Wei,Xu, Li,Choi, Ji Eun,Park, Ji Hyun,Song, Jae Kwang,Jang, Sinae,Eom, Chi-Yong,Shim, KyuHwan,Seong Soo, A.An,Kang, Young-Sun,Kwak, Minseok,Jeon, Hyeon Elsevier 2018 Biomaterials Vol.183 No.-
<P><B>Abstract</B></P> <P>The generation of virus-mimetic nanoparticles has received much attention in developing a new vaccine for overcoming the limitations of current vaccines. Thus, a method, encompassing most viral features for their size, hydrophobic domain and antigen display, would represent a meaningful direction for the vaccine development. In the present study, a polymer-templated protein nanoball with direction oriented hemagglutinin1 on its surface (H1-NB) was prepared as a new influenza vaccine, exhibiting most of the viral features. Moreover, the concentrations of antigen on the particle surface were controlled, and its effect on immunogenicity was estimated by <I>in vivo</I> studies. Finally, H1-NB efficiently promoted H1-specific immune activation and cross-protective activities, which consequently prevented H1N1 infections in mice.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>