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스마트그리드 상호운용성 확보를 위한 유스케이스 방법론에 따른 전기자동차 계통지원 모델에 관한 연구
조명진(Myeongjin Jo),김준기(Jungi Kim),오미림(Mirim Oh) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.10-3
As the spread of electric vehicles continues, various approaches to research, demonstration, and commercialization are being made to use electric vehicles as system flexibility resources. However, the requirements for discharging the vehicle’s battery to bring the research or demonstration into the commercialization stage are still insufficient, and models for grid support functions necessary for integration to the grid should be presented and considered in advance. In this study, models were analyzed and described so that electric vehicles can be used as flexible resources according to the smart grid use case methodology and the requirements were reviewed through the analysis of use cases including grid support functions to ensure interoperability of electric vehicles and charging infrastructures.
Early implant failure: a retrospective analysis of contributing factors
Kang, Dae-Young,Kim, Myeongjin,Lee, Sung-Jo,Cho, In-Woo,Shin, Hyun-Seung,Caballe-Serrano, Jordi,Park, Jung-Chul Korean Academy of Periodontology 2019 Journal of Periodontal & Implant Science Vol.49 No.5
Purpose: The aim of this retrospective study was to determine the prevalence of early implant failure using a single implant system and to identify the factors contributing to early implant failure. Methods: Patients who received implant treatment with a single implant system ($Luna^{(R)}$, Shinhung, Seoul, Korea) at Dankook University Dental Hospital from 2015 to 2017 were enrolled. The following data were collected for analysis: sex and age of the patient, seniority of the surgeon, diameter and length of the implant, position in the dental arch, access approach for sinus-floor elevation, and type of guided bone regeneration (GBR) procedure. The effect of each predictor was evaluated using the crude hazard ratio and the adjusted hazard ratio (aHR) in univariate and multivariate Cox regression analyses, respectively. Results: This study analyzed 1,031 implants in 409 patients, who comprised 169 females and 240 males with a median age of 54 years (interquartile range [IQR], 47-61 years) and were followed up for a median of 7.2 months (IQR, 5.6-9.9 months) after implant placement. Thirty-five implants were removed prior to final prosthesis delivery, and the cumulative survival rate in the early phase at the implant level was 95.6%. Multivariate regression analysis revealed that seniority of the surgeon (residents: aHR=2.86; 95% confidence interval [CI], 1.37-5.94) and the jaw in which the implant was placed (mandible: aHR=2.31; 95% CI, 1.12-4.76) exerted statistically significant effects on early implant failure after adjusting for sex, age, dimensions of the implant, and type of GBR procedure (preoperative and/or simultaneous) (P<0.05). Conclusions: Prospective studies are warranted to further elucidate the factors contributing to early implant failure. In the meantime, surgeons should receive appropriate training and carefully select the bone bed in order to minimize the risk of early implant failure.
Kim, Jung Yong,Noh, Seunguk,Nam, Young Min,Kim, Jun Young,Roh, Jeongkyun,Park, Myeongjin,Amsden, Jason J.,Yoon, Do Y.,Lee, Changhee,Jo, Won Ho American Chemical Society 2011 ACS APPLIED MATERIALS & INTERFACES Vol.3 No.11
<P>The effect of a nanoscale boron subphthalocyanine chloride (SubPc) interfacial layer on the performance of inverted polymer solar cells based on poly (3-hexyl thiophene) (P3HT) and [6,6]-phenyl-C<SUB>71</SUB>-butyric acid methyl ester (PC<SUB>71</SUB>BM) was studied. When a 1 nm SubPc layer was introduced between the active layer (P3HT:PC<SUB>71</SUB>BM) and MoO<SUB><I>x</I></SUB> in the device with ITO/ZnO/P3HT:PC<SUB>71</SUB>BM/SubPc/MoO<SUB><I>x</I></SUB>/Al configuration, the power conversion efficiency (PCE) was increased from 3.42 (without SubPc) to 3.59%. This improvement is mainly attributed to the enhanced open-circuit voltage from 0.62 to 0.64 V. When the Flory–Huggins interaction parameters were estimated from the solubility parameters through the contact angle measurement, it revealed that the interaction between SubPc and PC<SUB>71</SUB>BM is more attractive than that between SubPc and P3HT at the interface of P3HT:PC<SUB>71</SUB>BM/SubPc, through which charges are well transported from the active layer to the anode. This is supported by a decrease of the contact resistance from 5.49 (SubPc 0 nm) to 0.94 MΩ cm (SubPc 1 nm). The photoelectron spectra provide another evidence for the enhanced PCE, exhibiting that the 1 nm thick SubPc layer extracts more photoelectrons from the active layer than other thicknesses.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2011/aamick.2011.3.issue-11/am2009458/production/images/medium/am-2011-009458_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am2009458'>ACS Electronic Supporting Info</A></P>