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정우성 ( Jung¸ Woo-sung ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
For security of dam safety, a variety of expert skills such as geotechnical engineering, structural engineering, geology, hydraulics, hydrology, mechanical engineering, electricity, environmental engineering and so on are needed. So, it is important to develop the guideline which is easy to understand and available. Especially, the guideline for dam safety could provide the information about the items which are considered in case of design, construction and post-construction and could increase the life of the existing dam by the proper management actions. The purpose of this research is to develop the technical guideline for dam safety, which is needed to prevent the dam safety problems and mitigate the disaster risk for dam safety, and to recommend the skill for investigation, analysis and application included in the developed guideline.
장애가 있는 바리스타를 위한 작업 동선을 최소화하는 작업 공간 배치에 관한 연구: 유전 알고리즘의 응용
김우성 ( Kim¸ Woo-sung ),박경수 ( Park¸ Kyungsu ) 한국경영공학회 2021 한국경영공학회지 Vol.26 No.3
Purpose The goal is to find an optimal workspace design for the convenience of workers and improvement of the work environment in coffee shops where mentally disabled people perform their duties as baristas. Methods A genetic algorithm is applied to find the optimal arrangement, and chromosome representation, chromosome variation, and crossover operations are presented. Results By applying the algorithm using the actual data, it was found that the optimal layout reduces the total movement of a worker by 50% compared to the existing one. Conclusion The results illustrate that the method can help to reduce the fatigue of the worker since total movement of a worker can be reduced.
Speckle Reduction in Near-field Image of Multimode Fiber with a Piezoelectric Transducer
Woosung Ha,Sejin Lee,오경환,Yongmin Jung,김준기 한국광학회 2008 Current Optics and Photonics Vol.12 No.3
We propose and experimentally demonstrate an effective method to reduce near-field speckle noise at the output of a 50 μm graded index multimode fiber using a short cylindrical piezoelectric transducer (PZT) vibrating in the radial direction. The fiber was coiled as tightly as possible around the mandrel of the PZT and a periodic stretching effect was caused by the radial oscillations of the actuator. The output of the optical fiber using the He-Ne laser source was intensively observed by a CCD camera. By counting all the pixels corresponding to relative intensity graded into 256 levels in the selected area and by calculating standard deviation and mean value of the intensity, we could measure the speckle contrast and vibration effect quantitatively with reduction ratio of pixels and line profile of the illuminated region. It was clearly observed that the characteristics of the speckle pattern in the vibration-on state were significantly improved over that of the vibration-off state due to time-averaged smoothing.
Bakhtin’s View on Language and Discourse and Its Implications for ESL Students’ English Writing
Woosung Kim 한국중앙영어영문학회 2011 영어영문학연구 Vol.53 No.3
This paper investigates Bakhtin’s view on a language and provides implications for ESL students’ English writing in the era of globalization. Bakhtin’s primary concern on a language is the ‘word’ which he places in a dialogic condition. In his terms, the word is organic and contextual in its nature and is not a fixed entity. Consequently, he situates utterances in a culturally and historically specific environment. Bakhtin also makes a distinction between authoritative discourse and internally persuasive discourse. Within the realm of the authoritative discourse, which is the words of father, no dialogic relationship is possible, and the participants only succumbs to its authority. On the other hand, the internally persuasive discourse has become a place where words from different people clashes each other and contacts to other discourses are freely made. Individuals who are in the area of internally persuasive discourse are apt to create new words through the interactions with new materials and contexts. Bakhtin’s socio-culturally specific view on a language helps us to understand ESL student’s peculiar epistemological dimension. Also his distinction of two discourses provides an effective way to approach ESL students whose positions are situated in a politically and also ideologically complex plane.
Woosung Lee,심유식,정준호 대한뇌혈관외과학회 2016 Journal of Cerebrovascular and Endovascular Neuros Vol.18 No.2
Objective : The purpose of this study was to report our preliminary experience with endovascular treatment (EVT) for life-threatening bleeding from branches of the external carotid artery (ECA) in patients with traumatic maxillofacial fractures. Materials and Methods : A total of 12 patients seen between March 2010 and December 2014 were included in this study. All subjects met the following criteria: 1) presence of maxillofacial fracture; 2) continuous blood loss from oronasal bleeding; and 3) EVT to stop bleeding. Various clinical factors were recorded for each patient and the correlations between those factors and clinical outcome (Glasgow Outcome Scale, GOS) were evaluated. Results : Four patients were injured in traffic accidents, five in falls, and three by assaults. Mean initial Glasgow Coma Scale (GCS) was 6.9 ± 2.1 and the lowest hemoglobin measured was mean 6.3 ± 0.9 g/dL. GOS at discharge was 4 in five patients, 3 in three patients, and 1 (death) in four patients. GOS on follow-up (mean 13.7 months) was 5 in two patients, 4 in three patients, and 3 in three patients. Initial GCS (p = 0.016), lowest systolic blood pressure (p = 0.011), and lowest body temperature (p = 0.012) showed a significant positive correlation with good clinical outcomes. The number of units of red blood cells transfused (p = 0.030), the number of units of fresh frozen plasma transfused (p = 0.013), and the time from arrival to groin puncture (p < 0.001) showed significant negative correlation with good clinical outcomes. Conclusion : It might be suggested that rapid transition to EVT could be preferable to struggling with other rescue strategies to stop life-threatening bleeding from branches of the ECA in patients with traumatic maxillofacial fractures.
The short-term mean reversion of stock price and the change in trading volume
( Woosung Jung ),( Mhin Kang ) 한국파생상품학회 2021 선물연구 Vol.29 No.3
This study aims to analyze the effect of change in trading volume on the short-term mean reversion of the stock price in the Korean stock market. Through the variance ratio test, this paper finds that the market shows the mean reversion pattern after 2000, but not before. This study also confirms that the mean reversion property is significantly reduced if the effect of change in trading volume is excluded from the return of a stock with a significant contemporaneous correlation between return and change in trading volume in the post-2000 market. The results appear in both the Korea Composite Stock Price Index and Korea Securities Dealers Automated Quotation. This phenomenon stems from the significance of the return response to change in trading volume per se and not the sign of the response. Additionally, the findings imply that the trading volume has a term structure because of the mean reversion of the trading volume and the return also has a partial term structure because of the contemporaneous correlation between return and change in trading volume. This conclusion suggests that considering the short-term impact of change in trading volume enables a more efficient observation of the market and avoidance of asset misallocation.