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전기자동차와 플러그인 하이브리드 자동차를 위한 넓은 ZVS 범위를 갖는 단일단 차량탑재형 충전기
박준성(Junsung Park),박요한(Yohan Park),박찬수(Chansoo Park),최세완(Sewan Choi),박성식(Sungsik Park) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
본 논문에서는 일반 가정용 전원으로 친환경 차량의 배터리를 충전할 수 있는 On-board charger를 위한 단일단 능동클램프 하프브리지 컨버터를 제안한다. 제안하는 컨버터는 4개의 스위칭 소자를 가지며 전 듀티영역에서 ZVS가 성취되므로 스위칭 주파수를 높일 수 있다. 시뮬레이션을 통하여 타당성 및 성능을 검증하였다.
Secure and Scalable Key Aggregation Scheme for Cloud Storage
Park, YoHan,Park, YoungHo Korea Society of Industrial Information Systems 2015 한국산업정보학회논문지 Vol.20 No.2
As the communication technology and mobile devices develop, the need for the efficient and secure remote storage is required. And recently, many companies support cloud storages to meet the requirements of the customers. Especially in the business field where various companies collaborate, data sharing is an essential functionality to enhance their work performance. However, existing researches have not fully satisfied the requirement either efficiency and security. This paper suggests efficient and secure data sharing scheme for cloud storage by using secret sharing scheme. Proposed scheme can be applied to business collaborations and team projects.
Three-dimensional (3D) printing of mouse primary hepatocytes to generate 3D hepatic structure
Yohan Kim,Kyojin Kang,Jaemin Jeong,Seung Sam Paik,Ji Sook Kim,Su A Park,Wan Doo Kim,Jisun Park,Dongho Choi 대한외과학회 2017 Annals of Surgical Treatment and Research(ASRT) Vol.92 No.2
Purpose: The major problem in producing artificial livers is that primary hepatocytes cannot be cultured for many days. Recently, 3-dimensional (3D) printing technology draws attention and this technology regarded as a useful tool for current cell biology. By using the 3D bio-printing, these problems can be resolved. Methods: To generate 3D bio-printed structures (25 mm × 25 mm), cells-alginate constructs were fabricated by 3D bio-printing system. Mouse primary hepatocytes were isolated from the livers of 6–8 weeks old mice by a 2-step collagenase method. Samples of 4 × 10<SUP>7</SUP> hepatocytes with 80%–90% viability were printed with 3% alginate solution, and cultured with well-defined culture medium for primary hepatocytes. To confirm functional ability of hepatocytes cultured on 3D alginate scaffold, we conducted quantitative real-time polymerase chain reaction and immunofluorescence with hepatic marker genes. Results: Isolated primary hepatocytes were printed with alginate. The 3D printed hepatocytes remained alive for 14 days. Gene expression levels of Albumin , HNF-4α and Foxa3 were gradually increased in the 3D structures. Immunofluorescence analysis showed that the primary hepatocytes produced hepatic-specific proteins over the same period of time. Conclusion: Our research indicates that 3D bio-printing technique can be used for long-term culture of primary hepatocytes. It can therefore be used for drug screening and as a potential method of producing artificial livers.
Highly Enantioselective Total Synthesis of (+)-Isonitramine
Park, Yohan,Lee, Young Ju,Hong, Suckchang,Lee, Myungmo,Park, Hyeung-geun American Chemical Society 2012 Organic letters Vol.14 No.3
<P>A new efficient enantioselective synthetic method of (+)-isonitramine is reported. (+)-Isonitramine was obtained in 12 steps (98% ee and 43% overall yield) from δ-valerolactam <I>via</I> enantioselective phase-transfer catalytic alkylation, Dieckman condensation, and diastereoselective reduction as key steps.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2012/orlef7.2012.14.issue-3/ol2033042/production/images/medium/ol-2011-033042_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol2033042'>ACS Electronic Supporting Info</A></P>
( Yohan Park ),( Tae Hyun Ban ),( Hyung Duk Kim ),( Eun Jeong Ko ),( Jongmin Lee ),( Seok Chan Kim ),( Cheol Whee Park ),( Chul Woo Yang ),( Yong-soo Kim ),( Byung Ha Chung ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.2
Background/Aims: We investigated whether serum neutrophil gelatinase-associated lipocalin (NGAL) can predict mortality in patients with acute kidney injury (AKI) requiring continuous renal replacement therapy (CRRT). Methods: This study enrolled 169 patients who underwent serum NGAL testing at CRRT initiation from June 2017 to January 2019. The predictive power of serum NGAL level for 28-day mortality was compared to the Acute Physiology and Chronic Health Evaluation-II (APACHE-II) score and Sequential Organ Failure Assessment (SOFA) score via area under the receiver operating characteristic curve (AuROC) value. Results: There were 55 survivors and 114 non-survivors at 28 days post-CRRT initiation. Median serum NGAL level was significantly higher in the non-survivor group than in the survivor group (743.0 ng/mL vs. 504.0 ng/mL, p = 0.003). The AuROC value of serum NGAL level was 0.640, which was lower than APACHE-II score and SOFA score values (0.767 and 0.715, respectively). However, in the low APACHE-II score group (< 27.5), AuROC value of serum NGAL was significantly increased (0.698), and it was an independent risk factor for 28 day-mortality (hazard ratio, 2.405; 95% confidence interval, 1.209 to 4.783; p = 0.012). Conclusions: In patients with AKI requiring CRRT, serum NGAL levels may be useful for predicting short-term mortality in those with low APACHE-II scores.