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( Sungjun Choi Daein Choi ),( Seulggie Choi ),( Sang Min Park ),( Hyun-sun Yoon ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: There is emerging evidence that rosacea is associated with various systemic diseases. However, its association with cardiovascular disease (CVD) remains controversial. Objectives: We aimed to investigate whether patients with rosacea are at increased risk of developing CVD. Methods: This retrospective cohort study from the Korean National Health Insurance Service-Health Screening Cohort included patients with newly diagnosed rosacea (n=2,681) and age-, sex-, and index year-matched controls without rosacea (n=26,810) between 2003 and 2014. The primary outcome was subsequent CVD including coronary heart disease and stroke. Multivariable Cox regression analyses were used to evaluate adjusted hazard ratios (aHRs) for subsequent CVD adjusted for major risk factors of CVD. Results: Compared to controls, patients with rosacea were more likely to have more comorbidities and were less likely to smoke, consume alcohol, and exercise regularly. Rosacea patients displayed an increased risk for CVD (aHR 1.20, 95% CI 1.03-1.40) and coronary heart disease (aHR 1.29, 95% CI 1.05-1.60) compared to controls. The risk for stroke was not significantly increased (aHR 1.12, 95% CI 0.91-1.37). Conclusion: Patients with rosacea are more likely to develop subsequent CVD adjusted for major CVD risk factors.
Leukemia cutis mimicking banal folliculitis of the face and upper torso
( Sungjun Choi ),( Soyun Cho ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Various skin findings can be observed in leukemia but leukemia cutis (LC) is rarely seen. LC, defined as the infiltration of leukemic cells into the skin, occurs more commonly in acute myeloid leukemia (AML), especially M4 and M5 variants. Multiple erythematous nodules, papules or plaques distributed on the extremities and trunk is the typical presentation. However, LC sometimes can masquerade as benign inflammatory skin diseases such as rosacea and contact dermatitis. We report a case of 83-year-old man with AML who presented with a month history of severely pruritic scaly erythematous patches and papules on the face and upper torso that clinically mimicked eczema and folliculitis, respectively. Skin biopsy from a facial papule revealed atypical lymphocytic infiltration in the superficial and deep dermis. On immunohistochemical stain, the tumor cells were positive for CD43 and myeloperoxidase, which confirm the diagnosis of LC. He refused chemotherapy and only received symptomatic treatment with oral and topical steroid, topical tacrolimus and oral anti-histamine. The lesions and symptoms partially resolved in a month. It should be noted that benign-looking skin lesions in a patient with hematologic malignancy may actually be associated with malignant cell infiltration. However benign the skin lesions may appear, the possibility of malignancy should be kept in mind when it comes to a patient with hematologic malignancy.
Choi, Sungjun,Yun, Bin-Na,Jung, Wo Dum,Kim, Tae Hyun,Chung, Kyung-Yoon,Son, Ji-Won,Sang, Byoung-In,Jung, Hun-Gi,Kim, Hyoungchul Elsevier 2019 Scripta materialia Vol.165 No.-
<P><B>Abstract</B></P> <P>We demonstrated the use of three-dimensional (3D) atom-probe tomography (APT) for analyzing the electrochemical lithiation/delithiation in the composite cathodes of all-solid-state batteries (ASSBs). 3D APT provides direct determination of the Li-ion contents, having difficult by X-ray excitation. Compared with various cathodes, they showed a significant variation in the Li-ion concentration during lithiation/delithiation because of the poor solid-to-solid interfaces, which is an inherent problem in ASSBs. In addition, the loss of transition-metal content was quantitatively verified. We have confirmed that our APT can be effectively applied to ASSB systems and it would be provide a deeper understanding of electrochemistry in ASSBs.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Choi, Hojung,Won, Sungjun,Lee, Kichang,Choi, Mincheol,Yoon, Junghee The Korean Society of Veterinary Science 2004 大韓獸醫學會誌 Vol.44 No.2
This study was performed to evaluate echocardiographic parameters in dogs with experimental mitral regurgitation subjected to dobutamine stress testing. In 8 beagle dogs, a 4-prong grasping forceps was inserted into the left ventricle through the carotid artery with fluoroscopic guidance. The disruption of chordae or mitral valve leaflet was performed. Echocardiographic protocols included quantitative Doppler echocardiography and M-mode measurement for evaluating left ventricle function. After all measurement was obtained at rest, dobutamine was infused incrementally. In stress testing, all measurement also was performed at rest as the same method. In stress Doppler echocardiography, regurgitant fraction and aortic stroke volume was increased significantly (P<0.001). Effective regurgitant orifice and regurgitant volume was not changed. In M-mode examination, fractional shortening was increased significantly at stress test (P<0.001). From the results obtained in this study, it could be suggested that dobutamine stress echocardiography increase left ventricle performance in non-functional mitral regurgitation and quantitative Doppler echocardiography is non-invasive, accurate method in valvular regurgitation.
Sungjun Choi,Yong-Rae Jang,Hak-Sung Kim,Caroline Sunyong Lee 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.2
The flashlight sintering characteristics of inkjet-printed nanosized copper ink on paper substrates with varying pattern widths and intervals were studied. The copper nano particles (CNPs) synthesized using vapor self-assembled multilayer (VSAM) method to prevent oxidation, were produced with ink and patterned on a paper substrate through inkjet printing. The width and interval of the Cu patterns were varied from 350 to 550 μm to investigate the flashlight sintering tendency. It was confirmed that the Cu pattern resistivity decreased as the width of the Cu pattern increased, with decreasing interval between the Cu patterns. For the Cu pattern with the largest width and narrowest interval, the lowest specific resistivity was 6.43 × 10–6 Ω∙m. For auxiliary heating at 80 °C, the lowest resistivity of the Cu pattern was 7.10 × 10–6 Ω∙m with improved adhesion to the substrate, and this resistivity was 6.2 times lower than that without auxiliary heating. The temperature gradient of the CNP pattern during the flashlight sintering process was predicted using custom made simulation program. Therefore, the experiments and simulations confirmed that the wider the width and the narrower the interval between patterns, the flashlight sintering characteristics improved through higher heat generation by minimizing heat spreading.
Kaposi’s varicelliform eruption after chemotherapy
( Sungjun Choi ),( Soo Ick Cho ),( Dong-wan Kim ),( Dong Hun Lee ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Kaposi’s varicelliform eruption (KVE) is a disseminated cutaneous herpes simplex virus (HSV) infection that usually appears in patients with preexisting skin diseases. When KVE occurs in a patient with eczema, particularly atopic dermatitis which is the most common case, it is called eczema herpeticum. KVE is characterized by disseminated monomorphic dome-shaped vesiculopustular eruptions, usually over the head and neck area. We describe a 61-year-old man without any history of skin diseases presenting a prickling erythematous maculopapular rash on the face and neck. The first diagnosis was drug eruption for his recent history of chemotherapy but it was changed to KVE after new punched-out lesions appeared, which was confirmed by Tzanc smear, punch biopsy, and vesicle fluid culture. Intravenous acyclovir and additional oral valacyclovir cured him and only post inflammatory hyperpigmentation left. The clinical practitioner should be aware that even patients without a current or past history of skin diseases may develop KVE after chemotherapy.
Choi, Sungjun,Jeon, Minjae,Ahn, Junsung,Jung, Wo Dum,Choi, Sung Min,Kim, Ji-Su,Lim, Jaemin,Jang, Yong-Jun,Jung, Hun-Gi,Lee, Jong-Ho,Sang, Byoung-In,Kim, Hyoungchul American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.28
<P>The composite cathode of an all-solid-state battery composed of various solid-state components requires a dense microstructure and a highly percolated solid-state interface different from that of a conventional liquid-electrolyte-based Li-ion battery. Indeed, the preparation of such a system is particularly challenging. In this study, quantitative analyses of composite cathodes by three-dimensional reconstruction analysis were performed beyond the existing qualitative analysis, and their microstructures and reaction interfaces were successfully analyzed. Interestingly, various quantitative values of structure properties (such as the volume ratio, connectivity, tortuosity, and pore formation) associated with material optimization and process development were predicted, and they were found to result in limited electrochemical charge/discharge performances. We also verified that the effective two-phase boundaries were significantly suppressed to ∼23% of the total volume because of component dispersion and packing issues.</P> [FIG OMISSION]</BR>