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A Study on the Steering Performance and Turning Radius of Four-Rows Tracked Vehicle on Hard Ground
Oh, Jaewon,Lee, Changho,Min, Cheonhong,Hong, Sup,Cho, Huije,Kim, Hyungwoo Korean Society of Ocean Engineers 2015 Journal of advanced research in ocean engineering Vol.1 No.2
This study proposes a method to determine the effective angular velocity of each motor of a specific four-rows tracked vehicle (FRTV) in order to follow a given turning radius. The configuration of the four-rows tracked vehicle is introduced, and its dynamics analysis model is built using the DAFUL commercial software. The soil has been assumed to be hard ground, and the friction force between the ground and the tracked links is calculated using the Coulomb friction model. This paper uses a simulation to show that the error in the position increased with respect to the angle of the curvatures, so a method is proposed to compensate for the error in the motion of the motors. Various simulations are then carried out to verify the proposed formulation. The effects of the soil characteristics and the driving velocity will be further investigated in future studies.
Jaewon Oh,Dong Seok Kim,Mee-Yi Ryu 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Increasing the size of grain is considered an essential factor for manufacturing high-efficiency perovskite (PS) solar cells [1]. The grain size of PS film strongly depends on annealing temperature and time. We investigated the structural and optical properties of PS film with different grains because of various annealing conditions. As the annealing temperature and time increased, the grain size in PS increase, and a vertically columnar grain was formed. The PS film annealed at 150℃ for 1 min sowed better properties compared with that annealed at 100℃ for 1 min.
Oh, Jaewon,Lee, Beom Seob,Lim, Gibbeum,Lim, Heejung,Lee, Chan Joo,Park, Sungha,Lee, Sang-Hak,Chung, Ji Hyung,Kang, Seok-Min Academic Press 2020 Journal of molecular and cellular cardiology Vol.138 No.-
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Survivin has an anti-apoptotic effect against anthracycline-induced cardiotoxicity. Clinically, statin use is associated with a lower risk for heart failure in breast cancer patients with anthracycline chemotherapy. So, the purpose of our study was to investigate whether survivin mediates the protective effect of statin against anthracycline-induced cardiotoxicity.</P> <P><B>Methods</B></P> <P>Mice were treated once a week with 5 mg/kg doxorubicin for 4 weeks with or without atorvastatin 20 mg/kg every day then heart tissues were analyzed. Molecular and cellular biology analyses were performed with H9c2 cell lysates.</P> <P><B>Results</B></P> <P>Doxorubicin suppressed survivin expression via activation of FOXO1 in H9c2 cardiomyocytes. Whereas, atorvastatin inhibited FOXO1 by increasing phosphorylation and inhibiting nuclear localization. Doxorubicin induced FOXO1 binding to STAT3 and prevented STAT3 from interacting with Sp1. However, atorvastatin inhibited these interactions and stabilized STAT3/Sp1 transcription complex. Chromatin immunoprecipitation analysis demonstrated that doxorubicin decreased STAT3/Sp1 complex binding to survivin promoter, whereas atorvastatin stabilized this binding. In mouse model, atorvastatin rescued doxorubicin-induced reduction of survivin expression and of heart function measured by cardiac magnetic resonance imaging.</P> <P><B>Conclusions</B></P> <P>Our study suggested a new pathophysiologic mechanism that survivin mediated protective effect of atorvastatin against doxorubicin-induced cardiotoxicity via FOXO1/STAT3/Sp1 transcriptional network.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Statin use is associated with a lower risk for heart failure in cancer patients. </LI> <LI> Survivin had an anti-apoptotic effect against doxorubicin-induced cardiotoxicity. </LI> <LI> Statin inhibited FOXO1 binding to STAT3 and restored STAT3 binding to Sp1. </LI> <LI> Transcriptional regulation of survivin was mediated via FOXO1/STAT3/Sp1 network. </LI> </UL> </P>
Effect of Antisolvent Application Volume on CH₃NH₃PbI₃ Films
Jaewon Oh,Mee-Yi Ryu 한국진공학회(ASCT) 2022 Applied Science and Convergence Technology Vol.31 No.1
Antisolvent treatment methods used to manufacture high-quality perovskite films using solution processes vary in terms of the type of antisolvent and processing condition employed. We analyzed the structural dependences of a perovskite film in terms of the applied volume of ethyl acetate as an antisolvent and the optical properties resulting therefrom. The application of an excessive volume of the antisolvent caused excessive pinholes in the entire area of the perovskite film. In addition, the pinholes were found to hinder the transport of charge carriers.
Oh, Jaewon,Lee, Chan Joo,Kim, Doo Il,Rhee, Moo-Yong,Lee, Byoung-Kwon,Ahn, Youngkeun,Cho, Byung Ryul,Woo, Jeong-Taek,Hur, Seung-Ho,Jeong, Jin-Ok,Jang, Yangsoo,Lee, Sang-Hak Wiley (John WileySons) 2017 Clinical cardiology Vol.40 No.12
<P>Conclusions: The target achievement of LDL-C < 100 mg/dL was low, and 50% LDL-C reduction was moderately achieved in Korean patients with FH receiving maximal statin-based LLT. Pretreatment LDL-C levels and diabetes mellitus were associated with target achievement. Our results provide rare and informative data on FH treatment in Asian patients.</P>
Sodium-glucose Co-transporter 2 Inhibitors: a New Path for Heart Failure Treatment
Jaewon Oh,이승현,Chan Joo Lee,Seok-Min Kang 대한심장학회 2021 Korean Circulation Journal Vol.51 No.5
Results from cardiovascular outcome trials (CVOT) with 5 different sodium-glucose co-transporter 2 inhibitors (SGLT2i; empagliflozin, canagliflozin, dapagliflozin, ertugliflozin, sotagliflozin), initially developed for their glucose-lowering effect by blocking tubular glucose reabsorption in kidney, have been shown to decrease the risk of heart failure hospitalization (HFH) across a range of patients with and without atherosclerotic cardiovascular disease in patients with type 2 diabetes mellitus (T2DM). Following these CVOT results, SGLT2i (dapagliflozin, empagliflozin, sotagliflozin) also were reported to reduce HFH and cardiovascular death in patients with heart failure with reduced ejection fraction (HFrEF), regardless of existence or absence of T2DM. Ongoing studies have been conducted to evaluate the clinical benefit of SGLT2i (empagliflozin, dapagliflozin) in patients with heart failure with preserved ejection fraction (HFpEF). Although SGLT2i brought us to the entrance of a new era for prevention of HF incidence and worsening of HF, the search for pivotal mechanism of SGLT2i to improve our pharmacological armamentarium should continue in order to protect every HF patient from fatal progression of HF disease. In this review, we summarized the updated clinical evidences on SGLT2i (rather than basic and translational evidence) for reduction of HF risk in T2DM patients and favorable clinical outcomes in both HFrEF and HFpEF patients.
Oh, Jiyun,Kwak, Jae-Hwan,Kwon, Do-Young,Kim, A-Young,Oh, Dal-Seok,Je, Nam Kyung,Lee, Jaewon,Jung, Young-Suk Korean Society of ToxicologyKorea Environmental Mu 2014 Toxicological Research Vol.30 No.4
Environmental pollutants such as polycyclic aromatic hydrocarbons (PAHs) have been implicated in cancer development and progression. However, the effects of PAHs on carcinogenesis are still poorly understood. Here, we characterized a mouse cancer cell line BNL 1ME A. 7R.1 (1MEA) derived by transformation of non-tumorigenic liver cell line BNL CL.2 (BNL) using 3-methylcholanthrene (3MC), a carcinogenic PAH. RT-PCR and immunoblot analysis were used to determine the expression level of mRNA and proteins, respectively. To determine functionality, cell motility was assessed in vitro using a transwell migration assay. Both mRNA and protein levels of E-cadherin were significantly decreased in 1MEA cells in comparison with BNL cells. While the expression levels of mesenchymal markers and related transcription factors were enhanced in 1MEA cells, which could lead to increase in cell motility. Indeed, we found that 7-day exposure of BNL cells to 3-MC reduced the level of the adhesion molecule and epithelial marker E-cadherin and increased reciprocally the level of the mesenchymal marker vimentin in a dose-dependent manner. Taken together, these results indicate that the process of epithelial-mesenchymal transition (EMT) may be activated during premalignant transformation induced by 3-MC. A mechanism study to elucidate the relation between 3-MC exposure and EMT is underway in our laboratory.