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Diagnostic index for acute eosinophilic pneumonia without bronchoscopy in military smokers
( Sunmin Park ),( Deokjae Han ),( Ji Eun Lee ),( Duck Hyun Ryu ),( Hyung-jun Kim ) 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.2
Background/Aims: Acute eosinophilic pneumonia (AEP) is common among military smokers; however, bronchoscopy is required for the diagnosis. We aimed to derive and validate a scoring system to diagnose AEP without bronchoscopy. Methods: We conducted a retrospective study including patients diagnosed with AEP or any other pneumonia among military smokers hospitalized in the Armed Forces Capital Hospital from 15 November 2016 through 25 December 2019. The patients were divided into derivation and validation groups according to their admission day. Patient symptoms, laboratory findings, and computed tomography findings were candidate variables. Least absolute shrinkage and selection operator (LASSO) regression was used to calculate the scores for each variable. Results: Among 414 patients, AEP was confirmed in 54 of 279 patients (19.4%) in the derivation group and in 18 of 135 patients (13.3%) in the validation group. Ten variables were selected using LASSO regression: new-onset or a recently increased smoking (≤ 4 weeks) (8 points), interlobular septal thickening (5 points), absence of sputum (3 points), ground glass opacity (3 points), acute onset (≤ 3 days) (2 points), dyspnea (2 points), chest pain (2 points), leukocytosis (2 points), bronchovascular bundle thickening (2 points), and bilateral involvement (2 points). The area under the receiver-operating characteristic curve of the score to diagnose AEP was 0.997 (95% confidence interval, 0.992 to 1.000) in the derivation group and 0.985 (95% confidence interval, 0.965 to 1.000) in the validation group. Conclusions: We introduce a scoring system that can distinguish AEP from other types of pneumonia in military smokers without the need for bronchoscopy.
Multi-temporal Analysis of Deforestation in Pyeongyang and Hyesan, North Korea
( Sunmin Lee ),( Sung Hwan Park ),( Hyung Sup Jung ) 대한원격탐사학회 2016 大韓遠隔探査學會誌 Vol.32 No.1
Since forest is an important part of ecological system, the deforestation is one of global substantive issues. It is generally accepted that the climate change is related to the deforestation. The issue is worse in developing countries because the forest is one of important natural resources. In the case of North Korea, the deforestation is on the rise from forest reclamation for firewood collection and food production. Moreover, a secondary effect from flood intensifies the damage. Also, the political situation in North Korea presents difficulty to have in-situ measurements. It means that the accurate information of North Korea is nearly impossible to obtain. Thus, assessing the current situation of the forest in North Korea by indirect method is required. The objective of this study is to monitor the forest status of North Korea using multitemporal Landsat images, from 1980s to 2010s. Since the deforestation in North Korea is caused by local residents, we selected two study areas of high population density: Pyeongyang and Hyesan. In North Korea, most of clean Landsat images are acquired in fall season. The fall images have an advantage that we can easily distinguish agriculture areas from forest areas, also have an disadvantage that the forests cannot be easily identified because some of trees have turned red. To identify the forests exactly, we proposed a modified Normalized Difference Vegetation Index (mNDVI) value. The deforestation in Pyeongyang and Hyesan was analyzed by using mNDVI. The dimension of forest has decreased approximately 36% in Pyeongyang for 27 years and approximately 25% in Hyesan for 16 years. The results show that the forest areas in Pyeongyang and Hyesan have been steadily reduced.
Chemical Doping of Graphene by Altretamine(2,4,6-Tris [dimethylamino]-1,3,5-Triazine)
Sunmin Park,Heeseon Lim,양세나,Hangil Lee 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7
The electronic properties of altretamine(2,4,6-tris [dimethylamino]-1,3,5-triazine) adsorbed on epitaxial graphene (EG) were investigated by core-level photoemission spectroscopy (CLPES) in conjunction with low energy electron diffraction (LEED). We found that altretamine molecule adsorbed onto interface layer (S1) of graphene as we confirm decrement of S1 peak using CLPES and haziness of LEED pattern. Moreover, the measured work function changes verified that increased adsorption of the altretamine on graphene layer showed n-type doping characteristics due to charge transfer from altretamine to graphene through the nitrogens. Two distinct nitrogen bonding feature associated with the N 1s peak was clearly observed in the core-level spectra indicating two different chemical environments
Real-time correction system for improving the disparity image
Sunmin Song,SangJun Lee,Jae Wook Jeon 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
A correction method for local stereo matching disparity images is an essential technology in stereo vision. We propose the hardware architecture for correcting a real-time disparity image. This method uses the similarity between the pixel of invalid disparity value and the neighboring pixels to estimate an alternative value for the invalid value. The experimental results showed that the proposed system can correct a disparity image in real time for 60fps image processing.
[P014] Clinical efficacy of laser epilation as an early treatment modality of Becker`s nevus
( Sunmin Yim ),( Junghwa Yang ),( Yun Ho Lee ),( Jung Yup Kim ),( Jae Yun Lim ),( Ju-yeon Choi ),( Han-saem Kim ),( Joon Hong Min ),( Young Jun Choi ),( Jae-hui Nam ),( Ga-young Lee ),( Won-serk Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Background: Becker`s nevus is a relatively common harmatoma that, in adult patients, is usually accompanied with hair growth. Objectives: The purpose of this study is to evaluate the efficacy of epilation laser treatments, namely, long-pulsed 1064-nm Nd:YAG and 755-nm Alexandrite laser, in the treatment of Becker`s nevus Methods: Retrospective chart reviews and photographic analyses were performed for patients treated with epilation lasers. Clinical improvement was assessed by two blinded physicians using 5-point global assessment scale. Results: Total 13 patients (8 males, 5 females) with Fitzpatrick skin types IV, a mean age 2 of 5.0±9.4 years, were included. The most common lesions were on the cheeks (4 patients, 30.8 %) and every lesion showed scattered patterns of hair growth. 8 patients were treated with long-pulsed 1064-nm Nd:YAG laser; 4 patients were treated with 755-nm Alexandrite laser and one patient was treated with both lasers. The mean treatment interval was 28.7±6.0 days. The median total treatment session was 2.0 (interquartile range 1.0). After laser epilation therapy, 11 patients (84.6 %) showed an improvement margin of 50 %. The difference of treatment response between two lasers was not clinically significant. (p=0.80) No persistent and serious adverse events were observed during the follow-up period. Conclusion: Laser epilation can be an effective, early therapeutic option for the treatment of Becker`s nevus.
The Effects of RSVP on Scrolling through Long Lists
Sunmin Son(손선민),Geehyuk Lee(이기혁) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
Lists are regularly used in smartphones in order to display data that cannot fit in one screen. Consequently, smartphone users often experience mental and physical fatigue while browsing through long lists. Although a great amount of effort has been put into developing scrolling methods in mobile devices, the current flicking technique does not seem to be flawless. Rapid serial visual presentation (RSVP), a technique that can be implemented to allow space to be traded off for time, is suggested as a potential solution. A user study is performed, exploring the possibilities of enhancing browsing experiences on mobile devices through the utilization of the RSVP technique.