저 소음형 디젤엔진 발전기 세트에 관한 연구

주현돈 대한건축학회 1996 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.16 No.2

A Study on the Characteristics of Smoke Control Using Lower Part Pressurization with an Opening in a Large Scale Space

주현돈,안대영 한국방재학회 2013 한국방재학회논문집 Vol.13 No.6

Smoke control systems of an atrium keep occupants safe from smoke generated during unwanted fires. The two-zone layerinterface of the atrium is clearer than small room or corridor. Smoke control in large spaces are achieved using pressurization ofthe lower layer by mechanical ventilation. The objective of this study are to calculate the inflow and outflow mass rates throughthe upper and lower opening of the atrium, to study the lower part pressurization with or without the lower opening of the atrium,and to predict the steady-state smoke layer height which the mass outflow rate through the upper opening is more or less equal tothe mass rate of fire plume. The smoke layer height are analyzed by FDS developed by the National Institute of Standard andTechnology, USA. The part of analyzed results by FDS are compared with the experimental results performed by Yamana andTanaka. It is known that the lower part pressurization smoke control for the mass flow of the lower opening directing into theatrium from outside were superior to the smoke control directing into the outside from the atrium.

Analysis of Transient Ceiling Jet Waves in a Corridor

주현돈 한국방재학회 2011 한국방재학회논문집 Vol.11 No.6

As the examples of smoke spread in a corridor, the burn rooms are generally connected through a corridor to environment and a lobby. The wave amplitudes of the velocity of transient jet waves are very important in fire protection systems. The objectives of this study are to estimate mathematically the parameters of the transient jet wave velocities flowing through the unconfined ceiling of the corridor and to derive various related equations with the parameters. The parameters vary according to the wave induced velocity, the natural frequency, the wave number and the mean flow velocity. The transient ceiling jet waves are analyzed by FDS software developed by the National Institute of Standards and Technology, USA. The analyzed results of the smoke layer temperature are compared with the experimental results performed by Jones et al.. The relation of the mean velocity, the heat release rates and the door width is expressed by vm( Q· 1 ⁄3Wd1 ⁄3 )≅0.2the relation of the wave induced velocity, the heat release rates and the door width is expressed by vr( Q· 1⁄ 3Wd1⁄ 2⁄ )≅0.07

Flow Coefficients of Doorway Flow Field in Two-room Building Fires

주현돈,김현희 한국방재학회 2012 한국방재학회논문집 Vol.12 No.4

In the case of a fire of two-room’s enclosure, the inflow and outflow mass rates through the doorway located between a burn room and an adjacent room have been researched. The objective of this study are to calculate the flow rates through the doorway of the burn room, to study the inflow and outflow coefficients of the doorway, and accurately to predict the neutral-plane height from the floor of the room in the stratified fire cases of the two-room’s enclosure. The inflow and outflow mass rates are analyzed by FDS developed by the National Institute of Standard and Technology, USA. The analyzed results by FDS are compared with the experimental results performed by Nakaya et al. By our study it is known that the flow coefficients vary according to fire size and opening configuration and the mean values of the inflow and outflow coefficients are 0.8 and 1.0 respectively.

Experience with Elizabethkingia meningoseptica Infection in Adult Patients at a Tertiary Hospital

주현돈,Sun Young Ann,Sung Hyeok Ryou, M.D.,김윤섭,김종완,김도형 대한중환자의학회 2015 Acute and Critical Care Vol.30 No.4

Background: Few reports have documented the clinical characteristics and treatment outcomes of adult patients with Elizabethkingia meningoseptica infection. Methods: Medical records of patients over 18 years of age and suspected of having an E. meningoseptica infection from March 1, 2006 to February 28, 2013 were reviewed retrospectively. Their clinical characteristics, antimicrobial susceptibility results, and treatment outcomes were analyzed. Results: E. meningoseptica was isolated from 30 patients. Median age was 68.5 years, and infections were more frequent in males (17, 56.7%). The most common isolation source was sputum (23, 76.7%), and pneumonia was the most common condition (21, 70%) after excluding two cases of colonization. This bacterium was most susceptible to minocycline (27, 90%) and fluoroquinolones, including levofloxacin (20, 66.7%) and ciprofloxacin (18, 60%). The mortality rate due directly to E. meningoseptica infection was 20% (6/30), and uncontrolled pneumonia was the only cause of death. After isolating E. meningoseptica, the numbers of patients with pneumonia (9/9, 100% vs. 12/21, 57.1%), history of hemodialysis (5/9, 55.6% vs. 3/21, 14.3%), tracheostomy (8/9, 88.9 vs. 10/21, 47.6%), and median Charlson comorbidity index score (6 [range, 3–9] vs. 4 [range, 0–9]) were significantly higher in non-survivors than those in survivors (p < 0.05, for each). However, only 12 (40%) patients received appropriate antibiotics. Conclusions: E. meningoseptica infection most commonly presented as pneumonia in adults with severe underlying diseases. Despite the high mortality rate, the rate of appropriate antibiotic use was notably low.

경계요소법과 유한요소법에 의한 흡음판을 가진 구조물의 소음해석

주현돈,양승호 진주여자전문대학 2001 論文集 Vol.24 No.-

In many practical problems, the use of finite elements to discretize the fluid region leads to large stiffness and mass matrices. But, since the acoustic boundary element discretization requires to put elements only on the surface of structure, the size of matrices is reduced considerably. Here, we developed a numerical analysis program for the structural-acoustic coupling problems of the multi-region cavity, using boundary elements for the fluid regions and finite elements for the structure. By considering sound transmission through layered systems placed in a cavity, the accuracy of the coupled acoustical-structural finite element model has been verified by comparing its transmission loss predictions with analytical sloutions. Example problems are included to investigate the characteristics of the multi-region structural-acoustic coupling system with porous material.

디젤엔진 발전기 세트의 저소음화에 관한 연구

주현돈,양승호 진주여자전문대학 2002 論文集 Vol.25 No.-

Diesel engine generator sets in heavy industry plants and residential/official buildings can cause serious noise problem. In this paper, a low noise diesel engine generator set is developed through constructing an acoustic enclosure with ventilation duct silencers that effectively block the acoustic flow but guarantee good thermal flow. Acoustic design of the enclosure which is initially layout by rule of thumb, is evolved systematically through numerical reanalysis procedure, based on indirect boundary element method(IBEM) with a commercial acoustic analysis code. The acoustic and cooling performances of the developed low noise diesel engine generator set are confirmed by the experiment.

흡음영역의 소음저감에 관한 구조·음향 연성해석

주현돈 진주여자전문대학 2000 論文集 Vol.23 No.-

A structural-acoustic coupling problem involving fluid in a cavity divided with flexible walls and porous materials is investigated in this paper. We developed a numerical analysis program for the structural-acoustic coupling problems of the multi-domain cavity, using boundary elements for the fluid regions and finite elements for the structure. By considering sound transmission through layered systems placed in a cavity, the accuracy of the coupled acoustical-structural finite element model has been verified by comparing its transmission loss predictions with analytical solutions. Example problems are included to investigate the characteristics of the multi-domain structural-acoustic coupling system with porous material.

A Study on the Characteristics of Smoke Control Using Mechanical Ventilation with or without Lower Part Opening in a Large Scale Space

주현돈 한국방재학회 2015 한국방재학회논문집 Vol.15 No.1

Smoke control systems of an atrium keep occupants safe from smoke generated during unwanted fires. Smoke controls in large spacesare achieved by mechanical ventilation in the upper layer of two-zone layer. The objective of this study are to study the mechanicalventilation with or without the lower opening of the atrium, to predict the smoke layer heights according to the mass outflow ratesthrough the upper opening supplied by fan, and to predict the steady-state smoke layer height. The steady-state smoke layer heightsare analyzed by FDS. And the parts of results analyzed by FDS are compared with the experimental results performed by Yamana andTanaka. The smoke mechanical ventilation for the mass outflow directing into the outside from the atrium by fan without the loweropening was superior to the smoke ventilation with the lower opening. And the effect of the exhaust fan start-up time was small whenthe lower opening was closed. And in the mechanical venting system with a lower opening it is surely not to increase the smokeexhaustion efficiency at the upper part of the atrium by increasing the mechanical power of the fan.

치매전문요양병원 병동부의 공간구성 특성에 관한 연구 : 공용생활공간을 중심으로

주현돈,박재승 한국의료복지시설학회 2007 의료·복지 건축 Vol.13 No.1

As the population of the elderly increases drastically year by year in Korea, this phenomenon is being a serious problem because of the increasing speed not having been showed ever all over the world. This thesis would propose the space organizing features for well-organized dementia hospital focused on the public living space. The way arranging each function is very important because values of the physical and functional accessibility have a wide range of value as each type of facility. Moreover, if the arranged function unit is the same as the territory of the space, it could be a good guideline on architectural planning.