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Yangjin Shin,Sungyoul Park,Sewan Choi,Suyeon Cho,Hochang Jung,Junsung Park,Waegyeong Shin,Deokjin Kim 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper propose a novel winding changeover circuit that can maximize the average efficiency in the wide speed range to extend the driving distance of the Electric Vehicle and improve the fuel efficiency. Proposed circuit is Series-Parallel changeover circuit based thyristor. Due to the characteristics of the thyristor, it is possible to achieve a seamless transient state without interruption. So no additional snubber circuit is required and high efficiency and light weight of AC motor system can be expected because of low switch loss. The proposed winding changeover circuit is validated through simulation and experimental results with 80kW AC motor.
Non-infected and Infected Bronchogenic Cyst: The Correlation of Image Findings with Cyst Content
Jeon, Hong Gil,Park, Ju Hwan,Park, Hye Min,Kwon, Woon Jung,Cha, Hee Jeong,Lee, Young Jik,Park, Chang Ryul,Jegal, Yangjin,Ahn, Jong-Joon,Ra, Seung Won The Korean Academy of Tuberculosis and Respiratory 2014 Tuberculosis and Respiratory Diseases Vol.76 No.2
We hereby report a case on bronchogenic cyst which is initially non-infected, then becomes infected after bronchoscopic ultrasound (US)-guided transesophageal fine-needle aspiration (FNA). The non-infected bronchogenic cyst appears to be filled with relatively echogenic materials on US, and the aspirate is a whitish jelly-like fluid. Upon contrast-enhanced MRI of the infected bronchogenic cyst, a T1-weighted image shows low signal intensity and a T2-weighted image shows high signal intensity, with no enhancements of the cyst contents, but enhancements of the thickened cystic wall. The patient then undergo video-assisted thoracic surgery 14 days after the FNA. The cystic mass is known to be completely removed, and the aspirate is yellowish and purulent. To understand the image findings that pertain to the gross appearance of the cyst contents will help to diagnose bronchogenic cysts in the future.
Ten year outcomes after bypass surgery in aortoiliac occlusive disease
Gwan-Chul Lee,Shin-Seok Yang,Keun-Myoung Park,Yangjin Park,Young-Wook Kim,Kwang Bo Park,Hong Suk Park,Young-Soo Do,Dong-Ik Kim 대한외과학회 2012 Annals of Surgical Treatment and Research(ASRT) Vol.82 No.6
Purpose: Most outcome studies of bypass surgery are limited to five years of follow-up. However, as human life expectancy has increased, analyses of more long-term outcomes are needed. The aim of this study is to evaluate 10-year outcomes of anatomical bypasses in aortoiliac occlusive disease. Methods: From 1996 to 2009, 92 patients (82 males and 10 females) underwent aortic anatomical bypasses to treat aortoiliac occlusive disease at Samsung Medical Center. The patients were reviewed retrospectively. Kaplan-Meier survival analyses were performed using PASW ver. 18.0 (IBM Co). Results: A total of 72 patients (78.3%) underwent aorto-femoral bypasses (uni- or bi-femoral), 15 patients (16.3%) underwent aorto-iliac bypasses (uni- or bi-iliac), and 5 patients (5.4%) underwent aorto-iliac and aorto-femoral bypasses. The overall primary patency rates of the 92 patients were 86.2% over 5 years and 77.6% over 10 years. The 10-year limb salvage rate and overall survival rate were 97.7% and 91.7%, respectively. Conclusion: The overall patency rates of bypass graft and limb salvage rates decreased as time passed. The analysis of results after bypass surgery to treat arterial occlusive disease will be needed to extend for 10 years of follow-up.
Jo Woori,Seo Kwang Won,Jung Hwa Sik,Park Chui Yong,Kang Byung Ju,Kang Hyeon Hui,Ra Seung Won,Jegal Yangjin,Ahn Jong Joon,Park Soon Eun,Jung Moon Sik,Park Ju Ik,Park Eun Ji,Sim Chang Sun,Kim Tae-Bum,Le 대한천식알레르기학회 2021 Allergy, Asthma & Immunology Research Vol.13 No.2
Purpose: Work-related asthma (WRA) occupies about 10%–30% of all asthma cases. Among 2 subtypes of WRA (occupational asthma [OA] and work-exacerbated asthma [WEA]), the rate of WEA has been reported to increase recently. WRA is described as having worse characteristics than non-WRA (NWRA), while WEA is known to show similar severity to OA in terms of symptoms and exacerbations. However, these data were mainly based on indirect surveys. Ulsan is a highly industrialized city in Korea; therefore, it is estimated to have a high incidence of WRA. This study aimed to identify the characteristics of WRA in the city. Methods: This was a prospective asthma cohort study of individuals diagnosed with asthma and treated at Ulsan University Hospital between Jan 2015 and Dec 2016. Baseline characteristics and work-related inquiry (9 questionnaires) were investigated at enrollment. Various severity indices and job change were then investigated for the longitudinal analysis at 12 months after enrollment. Results: In total, 217 asthma patients completed the study. WRA accounted for 17% (36/217), with an equal number of WEA and OA (18 patients each). Before the work-related survey, only 33% (n = 12) of WRA patients (22% [4/18] of WEA and 44% [8/18] of OA) were diagnosed with WRA by the attending physicians. Compared to the NWRA group and the OA subgroup, the WEA subgroup had more outpatient visits, more oral corticosteroids prescriptions, and trends of low asthma control test scores and severe asthma. The rate of job change was markedly lower in the WEA subgroup than in the OA subgroup (20% vs. 5%). Conclusions: The overall prevalence of WRA (17%) was similar to those of previous studies, but the share of WEA was high (50% of WRA). WEA was more severe than OA or NWRA. The possible reason for this severity is ongoing workplace exposure.
( Yangjin Jegal ),( Jong Sun Park ),( Song Yee Kim ),( Hongseok Yoo ),( Sung Hwan Jeong ),( Jin Woo Song ),( Jae Ha Lee ),( Hong Lyeol Lee ),( Sun Mi Choi ),( Young Whan Kim ),( Yong Hyun Kim ),( Hye 대한결핵 및 호흡기학회 2022 Tuberculosis and Respiratory Diseases Vol.85 No.2
Background: The Korea Interstitial Lung Disease Study Group has made a new nationwide idiopathic pulmonary fibrosis (IPF) registry because the routine clinical practice has changed due to new guidelines and newly developed antifibrotic agents in the recent decade. The aim of this study was to describe recent clinical characteristics of Korean IPF patients. Methods: Both newly diagnosed and following IPF patients diagnosed after the previous registry in 2008 were enrolled. Survival analysis was only conducted for patients diagnosed with IPF after 2016 because antifibrotic agents started to be covered by medical insurance of Korea in October 2015. Results: A total of 2,139 patients were analyzed. Their mean age at diagnosis was 67.4±9.3 years. Of these patients, 76.1% were males, 71.0% were ever-smokers, 14.4% were asymptomatic at the time of diagnosis, and 56.9% were at gender-agephysiology stage I. Occupational toxic material exposure was reported in 534 patients. The mean forced vital capacity was 74.6% and the diffusing capacity for carbon monoxide was 63.6%. Treatment with pirfenidone was increased over time: 62.4% of IPF patients were treated with pirfenidone initially. And 79.2% of patients were treated with antifiboritics for more than three months during the course of the disease since 2016. Old age, acute exacerbation, treatment without antifibrotics, and exposure to wood and stone dust were associated with higher mortality. Conclusion: In the recent Korean IPF registry, the percentage of IPF patients treated with antifibrotics was increased compared to that in the previous IPF registry. Old age, acute exacerbation, treatment without antifibrotics, and exposure to wood and stone dust were associated with higher mortality.
Corrugated cooling unit for accelerated cooling of rebar subjected to Tempcore process
Park, Chun Su,Bae, Seh Wook,Cho, Jin Rae,Lee, Habeom,Kim, Yangjin,Moon, Young Hoon Elsevier 2020 Applied thermal engineering Vol.167 No.-
<P><B>Abstract</B></P> <P>An advanced cooling unit was developed and characterized to accelerate the cooling of steel rebars during the Tempcore process. Compared to conventional flat-surfaced coolers, the newly developed cooling unit uses a corrugated surface to generate turbulence. To estimate the cooling performance of the corrugated cooler, the heat transfer coefficient during the Tempcore process was obtained using a finite-volume method. The turbulence induced by the corrugated cooler reduces the vapor volume fractions and increases the heat transfer coefficient by up to 10%. The obtained heat transfer coefficient for convective and nucleate boiling was then applied in the model to predict the volume of martensite formed in the outer layer of the bar after the Tempcore process. The corrugated cooling unit was assembled and incorporated into an experimental simulator to evaluate its ability to accelerate cooling of rebars. For rebars treated in the corrugated cooler, a 6.54% increase in the martensite volume fraction with a 13 °C decrease in the self-tempering temperature was achieved. This result confirms that the developed corrugated cooler can be a reasonable alternative to increase cooling efficiency of Tempcore facility without upgrading the capacity of the water supplying system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The turbulence induced by the corrugated cooler increases the cooling capacity. </LI> <LI> Heat transfer coefficient for convective and nucleate boiling is numerically obtained. </LI> <LI> RPI boiling model and realizable k-epsilon model are extended to the Tempcore process. </LI> <LI> 6.54% increase in the martensite volume fraction is achieved by the corrugated cooler. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Nanoscale Thickness Control of Pulse-Plated Gold Layer on Leadframe by Tuning Anode Shield
Hwang, Yangjin,Park, Yong Ho,Lee, Soo Wohn,Lee, Kyu Hwan American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.11
<P>To enhance the uniformity of pulse-plated Au deposited on Pd/Ni preplated Cu leadframes, the dimensions of the anode-insulating shield were varied and optimized using numerical simulation. The Au thickness distribution was highly uniform when the ratio of shield to anode length was 0.595. In addition, the total consumption of Au plated on Pd/Ni/preplated Cu leadframes for quad flat no-lead packages in an existing deposition line was reduced from 1.19 to 0.96 mu g/cm(2), indicating a reduction of 19% Au when the shield was used.</P>