Brugada-like electrocardiographic pattern induced by fever in a patient with tuberculous pericarditis

Young Youp Koh(Young Youp Koh) 조선대학교 의학연구원 2023 The Medical Journal of Chosun University Vol.48 No.1

The Brugada syndrome (BS) is an inherited cardiac disease, which can lead to ventricular tachyarrhythmias and sudden cardiac death in patients with structurally normal hearts. The BS is characterized by distinctive ST-segment elevation in the right precordial leads frequently associated to right ventricular conduction delay on electrocardiogram (ECG). This report presents a patient with tuberculous pericarditis, in whom a transient Brugada-like ECG pattern was induced by fever.

An Enhanced Biometric-Based Three Factors User Authentication Scheme for Multi-server Environments

Youping Lin,Kaihui Wang,Baocan Zhang,Yuzhen Liu,Xiong Li 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.1

Authentication is an important and basic security service for many network based applications, which allows the registered user access remote services after the validity of his/her identity is verified by the remote server. Password, smart card and biometric are three frequently used factors in authentication, and some remote user authentication schemes for different environments had been presented based on these factors by researchers. Recently, Baruah et al. pointed out the weaknesses of Mishra et al.’s three factors user authentication scheme for multi-server environments, and they proposed an enhanced scheme. They claimed that their scheme has many security features and can resist some common attacks. However, based on our analysis, Baruah et al.’s scheme cannot resist stolen smart card attack, cannot protect user’s anonymity, and it is also vulnerable to Denial of Service attack. In this paper, an enhanced three factors user authentication scheme for multi-server environments based on fuzzy extractor technology is proposed, and the analysis show that the proposed scheme is more security and efficient than other related schemes.

Assessment and comparison of three different air quality indices in China

Youping Li,Ya Tang,Zhongyu Fan,Hong Zhou,Zhengzheng Yang 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.1

Air pollution index (API) is used in Mainland China and includes only SO₂, NO₂ and PM10. In 2016, air quality index (AQI) replaced API. AQI contains three more air pollutants (CO, O₃ and PM2.5). Both the indices emphasize on the effect of a single pollutant, whereas the contributions of all other pollutants are ignored. Therefore, in the present work, a novel air quality index (NAQI), which emphasizes on all air pollutants, has been introduced for the first time. The results showed that there were 19 d (5.2%) in API, 28 d (7.7%) in AQI and 183 d (50.1%) in NAQI when the indices were more than 100. In API, PM10 and SO₂ were regarded as the primary pollutants, whereas all five air pollutants in AQI were regarded as primary. Furthermore, four air pollutants (other than the CO) in NAQI were regarded as primary pollutants. PM10, as being the primary pollutant, contributed greatly in these air quality indices, and accounted for 51.2% (API), 37.0% (AQI) and 52.6% (NAQI). The results also showed that particulate matter pollution was significantly high in Luzhou, where stricter pollution control measures should be implemented.

Control Growth of Euphorbia pulcherrima Willd. ex Klotzsch ‘Sonora Jingle’ and ‘Sonora White’ Using Ethephon

Youping Sun,Lois Berg Stack,Donglin Zhang,Zhanying Gu 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.4

Ethephon was sprayed on Euphorbia pulcherrima Willd. ex Klotzsch (poinsettia) ‘Sonora Jingle’ and ‘Sonora White’ to control their height and produce more compact potted plants. The results showed that Ethephon could effectively control the growth of ‘Sonora Jingle’ and ‘Sonora White’ poinsettia. Height was reduced by was 33.4 ± 0.8% for ‘Sonora Jingle’ and 30.8 ± 1.3% for ‘Sonora White’ poinsettia, when 700 mg・L^(-1) Ethephon was sprayed three times on 29 August, 20September, and 13 October 2005, respectively. Similar to other plant growth retardants, side effects including phytotoxicity and delays to first bract color were also observed on Ethephon treated poinsettia. However, all plants produced were still of a marketable quality.

Longitudinal Assessment of Intravoxel Incoherent Motion Diffusion Weighted Imaging in Evaluating the Radio-sensitivity of Nasopharyngeal Carcinoma Treated with Intensity-Modulated Radiation Therapy

Youping Xiao,Ying Chen,Yunbin Chen,Zhuangzhen He,Yiqi Yao,Jianji Pan 대한암학회 2019 Cancer Research and Treatment Vol.51 No.1

Purpose Intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) was evaluated regarding its ability to preliminarily predict the short-term treatment response of nasopharyngeal carcinoma (NPC) following intensity-modulated radiation therapy. Materials and Methods IVIM-DWI with 14 b-factors (0-1,000 sec/mm2) was performed with a 3T MR system on 47 consecutive NPCs before, during (end of the 5th, 10th, 15th, 20th, and 25th fractions), and after fractional radiotherapy. IVIM parametrics (D, f, and D*) were calculated and compared to the baseline and xth fraction. Patients were categorized into responders and non-responders after radiotherapy. IVIM parametrics were also compared between subgroups. Results After fractional radiations, the D (except D5 and D at the end of the 5th fraction) after radiations were larger than the baseline D0 (p < 0.05), and the post-radiation D* (except D*5 and D*10) were smaller than D*0 (p < 0.05). f0 was smaller than f5 and f10 (p < 0.001) but larger than fend (p < 0.05). Furthermore, greater D5, D10, D15, and f10 coupled with smaller f0, D*20, and D*25were observed in responders than non-responders (all p < 0.01). Responders also presented larger D10, f10, D*20, and D*20 than non-responders (p < 0.05). Receiver operating characteristic curve analysis indicated that the D5, D*20, and f10 could better differentiate responders from non-responders. Conclusion IVIM-DWI could efficiently assess tumor treatment response to fractional radiotherapy and predict the radio-sensitivity for NPCs.

Synthesis of Cathode Materials LiNi1-yCoyO2 from various Starting Materials and their Electrochemical Properties

Myoung Youp Song,Ho Rim,Eui Yong Bang,Seong Gu Kang,Soon Ho Chang 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.6

CHMP1A suppresses the growth of renal cell carcinoma cells via regulation of the PI3K/mTOR/p53 signaling pathway

Wu Youping,Wu Yueguo,Xu Cong,Sun Wei,You Zhenqiang,Wang Yin,Zhang Sheng 한국유전학회 2022 Genes & Genomics Vol.44 No.7

Background: CHMP1A, a member of the ESCRT-III complex family, has been indicated as a brand-new inhibitor gene of tumors. Our previous research has revealed that CHMP1A plays a vital role in the development and progression of renal cell carcinoma (RCC). Objective: To investigate the potential target pathway of the regulation of the tumor cell growth by CHMP1A. Methods: The effect of CHMP1A on mTOR pathway was elucidated by western blotting. The effect of CHMP1A on the expression of p53 was evaluated, and A498 cell growth was assessed by colony formation and MTT assays. The expression of p53 was knocked down by shRNA-p53, and the effect of CHMP1A on mTOR after knockdown of p53 was evaluated. The effect of CHMP1A on apoptosis and its relationship with MDM2 pathway were detected by western blotting and FCM. Finally, the relationship between the regulation of p53 by CHMP1A and the PI3K/mTOR pathway was detected. Results: This study showed that the mTOR pathway was suppressed significantly in CHMP1A-overexpressing A498 and 786-0 cells; moreover, the enhanced expression of p53 and the reduced proliferation were shown in CHMP1A-overexpressing A498 cells. Furthermore, CHMP1A was able to regulate the PI3K/PTEN/mTOR and MDM2/p53 pathways in order to suppress RCC. In addition, CHMP1A regulated Bax and Bcl-2 via MDM2/p53 to induce the apoptosis of tumor cells and upregulated the expression of p53 via the PI3K/mTOR pathway. Conclusions: The results convey that CHMP1A-related suppression of RCC is closely related to the PI3K/mTOR/p53 pathway.

Hydrogen Storage Characteristics of Metal Hydro-Borate and Transition Element-Added Magnesium Hydride

( Myoung Youp Song ),( Young Jun Kwak ),( Hye Ryoung Park ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.7

A metal hydro-borate Zn(BH4)2 was prepared by milling ZnCl2 and NaBH4 in a planetary ball mill in an Ar atmosphere. This sample contained NaCl. 95 wt% MgH2-2.5 wt% Zn(BH4)2-2.5 wt% Ni samples [named MgH2-2.5Zn(BH4)2-2.5Ni] were then prepared by milling in a planetary ball mill in a hydrogen atmosphere. The hydrogen absorption and release properties of the prepared samples were investigated. In particular, variations in the initial hydriding and dehydriding rates with temperature were examined. MgH2-2.5Zn(BH4)2-2.5Ni dehydrided at the fourth cycle contained Mg, MgO, and small amounts of -MgH2 and Mg2Ni. The sample after hydriding-dehydriding cycling had a slightly smaller average particle size and a larger BET specific surface area than the sample after milling. Increasing the temperature from 573 K to 623 K led to a decrease in the initial hydriding rate. The initial dehydriding rate increased as the temperature increased from 573 K to 643 K. At 573 K under 12 bar H2, the sample absorbed 3.85 wt% H for 2.5 min, 4.60 wt% H for 5 min, 4.64 wt% H for 10 min, and 4.80 wt% H for 60 min. The MgH2-2.5Zn(BH4)2-2.5Ni had an effective hydrogen storage capacity (the quantity of hydrogen absorbed for 60 min) of near 5 wt% (4.96 wt% at 593 K). †(Received October 7, 2015; Accepted March 7, 2016)

The Effects of C-Rate on the Discharge Capacities of LiNi1-yMyO2 (M=Ni, Ga, Al and/or Ti) Cathodes

( Myoung Youp Song ),( Chan Kee Park ),( Soon Do Yoon ),( Hye Ryoung Park ),( Daniel R. Mumm ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 ELECTRONIC MATERIALS LETTERS Vol.4 No.4

LiNi1-yMyO2 specimens with compositions of LiNiO2, LiNi0.975Ga0.025O2, LiNi0.975Al0.025O2, LiNi0.995Ti0.005O2 and LiNi0.990Al0.005Ti0.005O2 were synthesized by wet milling and solid-state reaction method. All the synthesized samples possessed the α-NaFeO2 structure of the rhombohedral system (space group; R3m) with no evidence of any impurities. Among the LiNiO2 cathodes prepared with the weight ratios of LiNiO2:acetylene black: binder = 85:10:5, 85:12:3 and 90:7:3, the cathode with the weight ratio of 85:10:5 had the best cycling performance, with a discharge capacity degradation rate of 1.06 mAh/g/cycle and a discharge capacity at n=20 of 143.5 mAh/g. Among all the samples, LiNi0.990Al0.005Ti0.005O2 had the highest first discharge capacities at 0.1 C, 0.2 C and 0.5 C rates. That sample had the smallest R-factor value, indicating that it had the lowest degree of cation mixing. Among all the samples, LiNi0.975Al0.025O2 showed the lowest rate of decrease in the first discharge capacity with C rate. The first discharge capacities at 0.1 C, 0.2 C and 0.5 C rates were 170.5 mAh/g, 155.0 mAh/g and 124.2 mAh/g, respectively.

Comparison of Hydrogen Storage Properties of Pure MgH2 and Pure Mg

( Myoung Youp Song ),( Young Jun Kwak ),( Seong Ho Lee ),( Hye Ryoung Park ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.9

At the first cycle (n=1), pure MgH2 absorbed hydrogen extremely slowly at 593 K under 12 bar H2, absorbing 0.04 wt% H for 60 min. Activation of the pure MgH2 was completed after five hydriding- dehydriding cycles. At the 6th cycle, the pure MgH2 absorbed 2.41 wt% H for 5 min, 3.00 wt% H for 10 min, and 4.21 wt% H for 60 min, showing that the activated pure MgH2 had a much higher hydriding rate than the activated pure Mg. The pure Mg absorbed 0.10 wt% H for 5 min, 0.38 wt% H for 30 min, and 0.51 wt% H for 60 min at the first cycle. The activated pure Mg, whose activation was also completed after five hydriding- dehydriding cycles, absorbed 1.76 wt% H for 5 min, 2.17 wt% H for 10 min and 3.40 wt% H for 60 min. The XRD pattern of the pure MgH2 after hydriding-dehydriding cycling (n=7) revealed that the sample contained Mg, a small amount of MgO, and a large amount of MgH2, showing that a large fraction of MgH2 remains even after dehydriding in vacuum at 623 K for 2 h. (Received August 27, 2013)