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Extremely Rare CT and MRI Findings of Peritoneal Leiomyoma Mimicking Hepatic Mass: A Case Report
Jonghun Woo,Seo-Youn Choi,Hee Kyung Kim,Ji Eun Lee,Min Hee Lee,Sanghyeok Lim 대한영상의학회 2023 대한영상의학회지 Vol.84 No.4
Leiomyoma is a common benign tumor from smooth muscle cells, mostly in the uterus. Peritoneal leiomyomas (PLs) are extremely rare and mostly reported as disseminated peritoneal leiomyomatosis. However, to the best of out knowledge, radiologic findings of isolated PL are not reported in English literature. Herein, we introduce the radiologic findings of PL mimicking hepatic mass in a 34-year-old female. CT showed a mass with curvilinear heterogeneous enhancement at the liver’s peripheral area. On MRI, the mass showed gradual and heterogeneous enhancement on gadoxetic acid-enhanced MRI and diffusion restriction. The radiologic diagnosis was a benign hepatic tumor, such as degenerated hemangioma, adenoma, and inflammatory myofibroblastic tumor; however, the mass was diagnosed as PL pathologically.
Hangoeunbi Kang(Hangoeunbi Kang),Bo-Hyun Yoon(Bo-Hyun Yoon),Won-Myong Bahk(Won-Myong Bahk),Young Sup Woo(Young Sup Woo),Won Kim(Won Kim),Jonghun Lee(Jonghun Lee),InKi Sohn(InKi Sohn),Sung-Yong Park(Su 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.1
Objective: The Functioning Assessment Short Test (FAST) is a relatively specific test for bipolar disorders designed to assess the main functioning problems experienced by patients. This brief instrument includes 24 items assessing impairment or disability in 6 domains of functioning: autonomy, occupational functioning, cognitive functioning, financial issues, interpersonal relationships, and leisure time. It has already been translated into standardized versions in several languages. The aim of this study is to measure the validity and reliability of the Korean version of FAST (K-FAST). Methods: A total of 209 bipolar disorder patients were recruited from 14 centers in Korea. K-FAST, Young Mania Rating Scale (YMRS), Bipolar Depression Rating Scale (BDRS), Global Assessment of Functioning (GAF) and the World Health Organization Quality of Life Assessment Instrument Brief Form (WHOQOL-BREF) were administered, and psychometric analysis of the K-FAST was conducted. Results: The internal consistency (Cronbach’s alpha) of the K-FAST was 0.95. Test-retest reliability analysis showed a strong correlation between the two measures assessed at a 1-week interval (ICC = 0.97; p < 0.001). The K-FAST exhibited significant correlations with GAF (r = −0.771), WHOQOL-BREF (r = −0.326), YMRS (r = 0.509) and BDRS (r = 0.598). A strong negative correlation with GAF pointed to a reasonable degree of concurrent validity. Although the exploratory factor analysis showed four factors, the confirmatory factor analysis of questionnaires had a good fit for a six factors model (CFI = 0.925; TLI = 0.912; RMSEA = 0.078). Conclusion: The K-FAST has good psychometric properties, good internal consistency, and can be applicable and acceptable to the Korean context.
Kim, Jonghun,Park, Sungmin,Nam, Gyungmok,Choi, Young,Woo, Seungpyo,Yoon, Sang-Hee Elsevier 2018 Journal of the mechanical behavior of biomedical m Vol.78 No.-
<P><B>Abstract</B></P> <P>A mosquito is known to precisely and easily insert its proboscis to the human skin by pressing down a labium and vibrating a fascicle bundle. Its advanced skin-piercing mechanisms indicate that skin resistance to the insertion of needle-like objects can be changed by the application of mechanophysical stimuli. Here, we characterize the effect of the application of mechanophysical stimuli on skin resistance to microneedle insertion to find clues for inserting a microneedle in a deep and precise fashion with low force. Microneedles with a diameter of 60–140µm are inserted at a velocity of 0.1–2.0mm/s to full-thickness porcine skins while either <I>uniaxial/equibiaxial stretch</I> of 0–20% or <I>mechanical vibration</I> at a frequency of 1 to 1000Hz and an amplitude of 1–10µm is applied to the skins as static or dynamic mechanophysical stimulus, respectively. The values of force and depth at two events of skin puncture and maximum penetration are measured to explore changes in skin resistance induced by the application of external stimuli. The static mechanophysical stimulus applied to the skin mainly affects the precision of microneedle insertion; the application of dynamic mechanophysical stimulus controls the value and deviation of skin resistance to microneedle insertion. The application of mechanophysical stimuli, inspired from a mosquito, therefore allows a microneedle to be deeply and easily inserted to the skin in a controlled way. The findings will have broad impacts on microneedle-mediated applications and lead to an in-depth understanding of skin biomechanics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mechanophysical stimuli are applied to the skin during microneedle insertion. </LI> <LI> Stretch and mechanical vibration are considered as mechanophysical stimuli. </LI> <LI> Changes in skin resistance caused by the application of stimuli are investigated. </LI> <LI> The method allows deep, easy microneedle insertion to the skin in a controlled way. </LI> <LI> This study elucidates the biological mechanisms used by mosquito and honey bee. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
하돈우 ( Don-woo Ha ),이기순 ( Gi-soon Lee ),백종훈 ( Jonghun Baek ),최지연 ( Ji Yeon Choi ),이영재 ( Youngjea Lee ),신동석 ( Dong Seok Shin ) 한국환경기술학회 2023 한국환경기술학회지 Vol.24 No.1
With the introduction of the Total Water Pollution Load Management System(TPLMS), the water quality tendency and the contribution rate of tributaries to pollution load at Yeongbon B point, a river basin, were analyzed by using and expanding observation data for water quality management. The BOD tendency was in a no trend state, but showed a tendency to decrease as a whole. T-P was found to repeat increases and decreases. It was analyzed that the reduction effect of Total Water Pollution Load Management System(TPLMS) was small. As a result of analyzing the contribution rate of the load amount of the tributary observation point in the unit basin, it was analyzed that the contribution rates of Yeongbon B1, Yeongbon B2, and Yeongbon B3, which are owned river points, were low. Gwangjucheon, Hwangnyeong river, and Pyeongdongcheon, which are Water Quality Forecasting System observation points, were analyzed to have a high contribution rate. The result of analyzing the proportion of contribution of pollutants was analyzed that the contribution rate of T-P was higher than that of BOD. It was analyzed that the tendency of water quality in the Yeongbon B unit basin was highly related to the change in the contribution rate of tributaries. In order to manage the water quality in Yeongbon B unit basin of the future, it will be necessary to focus on Gwangjucheon and Hwangryong river. The results of study are intended to contribute to basic data for water quality management.
Tail asymptotics of fluid queues in a distributed server system fed by a heavy-tailed ON-OFF flow
Lee, Byeongchan,Yoon, Jonghun,Shin, Yang Woo,Hwang, Ganguk AMERICAN INSTITUTE OF MATHEMATICAL SCIENCES 2016 JOURNAL OF INDUSTRIAL AND MANAGEMENT OPTIMIZATION Vol.12 No.2
<P>The appearance of heavy-tailedness in users' traffic significantly degrades the performance of communication systems, and a distributed server system is considered as a good solution to this problem because of its distributed service characteristic by multiple servers. So we tackle the question in this paper that a distributed server system can alleviate heavy-tailedness, so that users experience good QoS as if there were no heavy-tailedness. To this end, we first mathematically model a distributed server system and obtain a heavy-tailed random sum with the help of the theory of perturbed random walk. We then analyze the tail asymptotic of the heavy-tailed random sum to find a condition with which the distributed server system can alleviate heavy-tailedness.</P>