• 대한한의학회지
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• 제38권1호
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• pp.1-7
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• 2017

Objectives: This paper is focused on the development of supporting device for the direct moxibustion. This device makes one help to do moxibustion on one's head and back for oneself. Without this device, one can't avoidthe other's help to do moxibustion on one's head and back. Methods: The design protocols of the supporting device for the direct moxibustion are determined. And 3 dimensional simulation using Ultimaker's 3D printer was carried out. The parts of the supporting device for direct moxibustion are followings: 1. preparing of the main parts which are divided into an acupuncture touching sting and moxa holder. 2. preparing a grip part. Results: 3 different lengths of the acupuncture touching sting such as 3mm, 4mm, and 5mm were experimented for the perfect burning of moxa. Among them, the acupuncture touching sting with 4mm length was best for the perfect burning and for the organic functional tests. Conclusion: The supporting device for direct moxibustion will be helpful to minimize of the burning of skin, the pain, and the smoke.

• 대한한의진단학회지
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• 제20권2호
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• pp.77-84
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• 2016

Objectives This paper is focused on the development of supporting device for the direct moxibustion. This device makes one help to do moxibustion on one's head and back for oneself. Without this device, one can't avoid the other's help to do moxibustion on one's head and back. Methods The design protocols of the supporting device for the direct moxibustion are determined. And 3 dimensional simulation using Ultimaker's 3D printer was carried out. The parts of the supporting device for direct moxibustion are followings: 1. preparing of the main parts which are divided into an acupuncture touching sting and moxa holder. 2. preparing a grip part. Results 3 different lengths of the acupuncture touching sting such as 3mm, 4mm, and 5mm were experimented for the perfect burning of moxa. Among them, the acupuncture touching sting with 4mm length was best for the perfect burning and for the organic functional tests. Conclusion The supporting device for direct moxibustion will be helpful to minimize of the burning of skin, the pain, and the smoke.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2004년도 추계학술대회 논문집
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• pp.406-410
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• 2004

Rapid prototyping technologies have been widely used to reduce the development cost of new products. Manufacturing industries are nowadays characterized by the flexibility and complexity of products. This to due to the rapid development of manufacturing technology and diverse needs of customers. In this paper, the burning condition for getting casting product of resin pattern have been examined experimentally. In generally, the burning conditions have effect on the casting products. Using the direct casting. we directly producted the jewelry.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2004년도 제29회 KOSCI SYMPOSIUM 논문집
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• pp.62-69
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• 2004

Zone conditional formulations for the Reynolds average reaction progress variable are used to derive an asymptotic expression for turbulent burning velocity. New DNS runs are performed for validation in a statistically one dimensional steady state configuration. Parametric study is performed with respect to turbulent intensity, integral length scale, density ratio and laminar flame speed. Results show good agreement between DNS results and the asymptotic expression in terms of measured maximum flame surface density and estimated turbulent diffusivity in unburned gas.

• 한국연소학회지
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• 제9권4호
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• pp.1-8
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• 2004

Zone conditional formulation for the Reynolds average reaction progress variable is used to derive an asymptotic expression for turbulent burning velocity. New DNS runs are performed for validation in a statistically one dimensional steady state configuration. Parametric study is performed with respect to turbulent intensity, integral length scale, density ratio and laminar flame speed. Results show good agreement between DNS results and the asymptotic expression in terms of measured maximum flame surface density and estimated turbulent diffusivity in unburned gas.

• 한국표면공학회지
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• 제50권1호
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• pp.17-23
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• 2017

This work demonstrates arc generation and anodic film formation behaviors on Al1050 alloy during PEO (plasma electrolytic oxidation) treatment under a constant direct current in an alkaline electrolyte containing silicate, carbonate and borate ions. Only one big arc more than 2 mm diameter was generated first at the edges and it was moving on the fresh surface or staying occasionally at the edges, resulting in the local burning due to generation of an extremely big orange colored arc at the edges. Central region of the flat surface was not fully covered with PEO films even after sufficiently long treatment time because of the local burning problem. The anodic oxides formed on the flat surface by arcing once were found to consist of a number of small oxide nodules with spherical shape of $3{\sim}6{\mu}m$ size and irregular shapes of about $5{\sim}10{\mu}m$ width and $10{\sim}20{\mu}m$ length. The anodic oxide nodules showed uniform thickness of about $3{\mu}m$ and rounded edges. These experimental results suggest that one big arc observed on the specimen surface under the application of a constant direct current is composed of a number of small micro-arcs less than $20{\mu}m$ size.

• 한국토양비료학회지
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• 제46권6호
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• pp.570-574
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• 2013

This study was conducted to assess $N_2O$ emissions in agricultural soils of Korea under the 1996 IPCC (Intergovernmental Panel on Climate Change) methodology. $N_2O$ emissions in agricultural soils were calculated the sum of direct emission and indirect emission by the N sources and emissions by field burning of crop residues. $N_2O$ emission was highest in animal manure as 1,547 $CO_2$-eq Gg. Indirect emissions by atmospheric deposition and leaching and runoff were 1,463 and 1,753 $CO_2$-eq Gg, respectively. $N_2O$ emission by field burning of crop residues was highest in pepper due to the residue/crop ratio and field burning ratio.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집B
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• pp.704-709
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• 2000

Laminar burning velocities of propane- and iso-octane-air mixtures have been numerically modelled over a wide range of equivalence ratio, pressure and temperature. These correlations are applicable to the modelling of stratified charged combustion like that of lean bum and GDI engine combustion. The numerical models are based on the results calculated by PREMIX code with Sloane's detailed chemical reaction mechanism for propane and FlameMaster code with Peters' for iso-octane. Laminar burning velocity for two fuels showed a pressure and temperature dependence in the following form, in the range of $0.1{\sim}4MPa$, and $300{\sim}1000K$, respectively. $S_L={\alpha}\;{\exp}[-\xi({\phi}-{\phi}_m)^2-{\exp}\{-{\xi}({\phi}-{\phi}_m)\}-{\xi}({\phi}-{\phi}_m)]$ where ${\phi}_m=1.07$, and both of ${\alpha}$ and ${\xi}$ are functions of pressure and temperature. Compared with the results of the existing models, those of the present one showed the good agreement of the recent experiment data, especially in the range of lean and rich sides. Judging from the calculated results of the stratified charged combustion by using STAR-CD, the above modelling prove to be more suitable than the other ones.

• 한국터널지하공간학회 논문집
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• 제7권2호
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• pp.109-117
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• 2005

본 연구는 터널내 화재시 배연속도가 연소율 변화에 미치는 영향을 파악하기 위하여 Froude scaling에 의해 1/20 크기로 축소한 모형화재 실험을 수행하였다. 화원으로는 4.5cm~8.5cm의 헵탄을 사용하였으며 발열량은 3.71~15.6 kW이다. 연소율은 로드셀을 이용하여 산출하였고, 연기거동을 파악하기 위하여 K형 열전대를 이용하여 온도분포를 측정하였다. 풍동은 터널 상류 한쪽부분과 연결하였고, 터널 공간의 배연속도를 제어하기 위하여 풍동의 인버터를 조정하였다. 헵탄 풀화재인 경우 배연속도가 증가할수록 충분한 산소의 공급으로 연소율은 증가하였으며, 같은 무차원 속도($\bar{V}$) 일때 화원 크기가 작아짐에 따라 연소율은 증가하였다.

• 한국대기환경학회지
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• 제34권2호
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• pp.259-268
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• 2018

The $PM_{2.5}$ samples were collected for every 6th day during one year at a suburban site in the Namwonsi, Jeollanamdo, Republic of Korea. Samples were analyzed for elemental carbon (EC), organic carbon (OC), and water-soluble organic carbon (WSOC), and levoglucosan. Although the water-soluble fraction of fine particulate OC consistently showed over a year, levoglucosan fraction of WSOC varied considerably from month to month. In this study, non-biomass-burning WSOC ($WSOC_{NBB}$) and biomass-burning $WSOC_{BB}$ were calculated with measurements of organic source tracer, levoglucosan, to better understand the temporal distribution and sources of WSOC. Two methods of predicting the secondary organic carbon from the biomass-burning $WSOC_{BB}$ Method and the EC-tracer Method were compared. Poor correlations between SOC estimated between two methods suggested that the use of the EC tracer method to estimate SOC may be significantly flawed. Direct measurements of levoglucosan and WSOC can provide a reasonable estimate of secondary organic carbon concentrations.