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정승원,김경래,태경,김윤정,Jeong, Seung-Won,Kim, Kyung-Rae,Tae, Kyung,Kim, Yun-Jeong 대한기관식도과학회 2010 大韓氣管食道科學會誌 Vol.16 No.2
We report a case of actinomycotic infection in epiglottis. Actinomycosis in the head and neck area is relatively rare but extremely rare in the larynx. A 63-year old man presented with continuous discomfort of the throat while swallowing. He had a history of oral injury caused by a fish bone a few weeks prior. Upon Examination with a flexible laryngoscope, a whitish round mass was noted at the lingual surface of the epiglottis. Under local anesthesia, a punch biopsy was performed and showed the typical features of actinomycosis. The mass was removed using a Diode laser under suspension laryngoscope. Additive oral antibiotic therapy was done for 2 weeks. No definite recurrence was noted at the operation site and the patient is now free of disease.
폴리머 기판위에 형성된 나노구조제어 알루미나의 캐패시터 특성
정승원,민형섭,한정환,이전국,Jung, Seung-Won,Min, Hyung-Sub,Han, Jeong-Whan,Lee, Jeon-Kook 한국재료학회 2007 한국재료학회지 Vol.17 No.2
Embedded capacitor technology can improve electrical perfomance and reduce assembly cost compared with traditional discrete capacitor technology. To improve the capacitance density of the $Al_2O_3$ based embedded capacitor on Cu cladded fiber reinforced plastics (FR-4), the specific surface area of the $Al_2O_3$ thin films was enlarged and their surface morphologies were controlled by anodization process parameters. From I-V characteristics, it was found that breakdown voltage and leakage current were 23 V and $1{\times}10^{-6}A/cm^2$ at 3.3 V, respectively. We have also measured C-V characteristics of $Pt/Al_2O_3/Al/Ti$ structure on CU/FR4. The capacitance density was $300nF/cm^2$ and the dielectric loss was 0.04. This nano-porous $Al_2O_3$ is a good material candidate for the embedded capacitor application for electronic products.
한강하류의 환경학적 연구 V.식물플랑크톤 군집 대발생의 특징
정승원,이진환,유종수,Jeong, Seung-Won,Lee, Jin-Hwan,Yu, Jong-Su 한국조류학회(藻類) 2003 ALGAE Vol.18 No.4
Ecological characteristics of phytoplankton communities were investigated biweekly at 6 stations from Feb. 2001 to Feb. 2002 at the lower part of the Han River. During the study, a total of 267 taxa which were composed of 114 green algae, 104 diatoms, 22 blue-green algae, 13 chrysophytes and 2 dinoflagellates were observed. The standing crops of phytoplankton communities were ranged from 1.30 ${\times}10^6$ cells ${\cdot}l^{-1}$ to 37.47 ${\times}10^6$ cells ${\cdot}l^{-1}$. The dominant species were 11 taxa including Pediastrum duplex, Scenedesmus quadricauda in green algae, Osillatoria limosa, Microcystis aeruginosa, Merisomorpedia sp., Phormidium sp. in blue-green algae, and Asterionella gracillima, Aulacoseira granulata, Fragilaria crotonensis, Stephanodiscus hantzschii f. tenuis, Synedra acus in diatoms. Asterionella gracillima and Stephanodiscus hantzschii f. tenuis were abundant at every station from winter to spring. Stephanodiscus hantzschii f. tenuis occupied the highest dominant ratio and standing crop. From summer to autumn, dominant species were Aulacoseira granulata at all stations and blue-green algae such as Osillatoria limosa, Microcystis aeruginosa, Merisomorpedia sp. at some stations. These 4 species were mostly present at the lower stations 4, 5, 6 and very few at the upper stations 1, 2, 3.
마산만 표층수에서 물리-화학적 수질요인과 엽록소-a 농도 사이의 관계: 격일 관측 자료
정승원 ( Seung Won Jung ),임동일 ( Dhong Il Lim ),신현호 ( Hyeon Ho Shin ),정도현 ( Do Hyun Jeong ),노연호 ( Youn Ho Roh ) 한국환경생물학회 2011 환경생물 : 환경생물학회지 Vol.29 No.2
In order to investigate water quality factors controlling chlorophyll-a concentrations, the by-daily monitoring was conducted from February to November 2010 in 4 stations of Masan Bay. Seasonal variability in physico-chemical factors was mainly controlled by freshwater loading as a result of precipitation: chemical oxygen demand, suspended solids and nutrient concentrations rapidly increase during the heavy rainy season, whereas they decrease in the dry season. From late winter to mid spring, phosphorus and silica sources relative to Redfield ratio were probably functioned as limiting factor for phytoplankton flourishing in surface waters, but nitrogen concentration during mid-spring to autumn might be responsible for the increase of phytoplankton biomass. The multiple regression analysis revealed that variations in chlorophyll-a concentration may be strongly correlated with changes of water temperature, chemical oxygen demand, dissolved inorganic phosphorus in spring, and salinity, chemical oxygen demand and precipitation in summer. Consequently, in the Masan Bay, a heavy rainfall event is an important factor to determine changes of biotic and abiotic factors, and in addition the dynamics of chlorophyll- a concentration are strongly affected by changes of hydrological factors, especially water temperature, precipitation and nutrients.
정승원(Jeong Seung Won),정원지(Chung Won Jee),김명식(Kim Myung Sik),전주열(Jeon Ju Yeal) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.1
This paper provides a methodology for extracting design data from the three-dimensional design software SolidWorks<SUP></SUP>®<SUP></SUP>, which isbased on the existing trochoid pump design equations thatare used by hydraulic field engineers. The data extracted from the SolidWorks<SUP></SUP>®<SUP></SUP> model are input to a hydraulic analysis software AMESim<SUP></SUP>®<SUP></SUP> model todetermine the design factors that can influence the properties of a trochoid pump. On the basis of the simulation results, this paper proposesa methodto reduce the flow loss by adjusting the outlet angle of the trochoid pump. This proposal was verified by using actual experimental results, which confirmed that adjusting the outlet angle can increase the flow rate. Hence,the results presented in this paper can contribute to the prototyping of a trochoid pump by reducing the cost associated with a trial-and-error design.
정승원 ( Seung Won Jeong ),이노우에유스케 ( Yusuke Inoue ),서영준 ( Young Joon Seo ),김연희 ( Yun Hee Kim ) 한국병원경영학회 2009 병원경영학회지 Vol.14 No.2
This study purports to verify managerial effectiveness of the integrated delivery system(IDS) of Japanese health care institutions through comparing the managerial performance between hospital groups providing with both acute and nursing care and those with acute care only. Data on the managerial performance of 697 hospitals providing with nursing care together and 819 hospitals providing with acute care only were collected from Japanese Central Social Insurance Medical Councils 2001, 2003, 2005, and were analyzed using mean comparison test(t-test) between the two groups. The results revealed that there were significant differences between the two groups in such indicators as ratio of material cost, labor cost, depreciation rate, total margin, operating margin, average number of outpatient per day, average revenue of an inpatient per day, total amount of labor cost, gross revenue per employee, and labor productivity. However, we could not find out any consistent evidence which support the effect of integrated delivery system on the hospital managerial performance. Further discussion was made on the limitation of the study and future research agenda relevant to the topic.