• 천문학회보
• /
• 제38권2호
• /
• pp.87.2-87.2
• /
• 2013

We studied a fine-scale half ring-like structure around a pore seen from the high spectral and the high spatial resolution data. Our observations were carried out using the Fast Imaging Solar Spectrograph (FISS) and the InfraRed Imaging Magnetograph (IRIM) installed at the 1.6 meter New Solar Telescope of Big Bear Solar Observatory (BBSO) on 2012 July 19. During the observations, we found a fine-scale half ring-like structure located very close to a pore (~0.4 arcsec apart from the pore). It was seen in the far wing images of the $H{\alpha}$ and Ca II $8542{\AA}$ lines, but it was not seen in the line center images of two lines. The length of the structure is about 4200 km and the width is about 350 km. We determined its line-of-sight velocity using the Doppler shift of the centroid of the Ti II line ($6559.6{\AA}$, close to the $H{\alpha}$ line) and determined horizontal velocity using the NAVE method. we also investigated the magnetic configurations using the Stokes I, Q, U, and V maps of the IRIM. As a results, we found that it has a high blue-shift velocity (~2km) faster than the photospheric features and has a strong horizontal component of the magnetic field. Based on our findings, we suggest that it is associated with small flux emergence, which occurs very close to the pore. Even though it is very small structure, this kind of magnetic configuration can be in chare of the upper chromosphere heating, especially above the pore.

• 한국식품위생안전성학회지
• /
• 제30권3호
• /
• pp.249-257
• /
• 2015

위생적인 수확후처리를 통하여 안전한 농산물 생산을 유도하기 위하여 영양부추를 대상으로 수확후 처리시설 모델을 개발하였으며 개발된 수확후 처리시설 설치와 위생교육이 미생물 안전에 미치는 효과를 검증하고자 본 연구를 수행하였다. 이를 위하여 양주지역 영양부추 생산 농가의 수확 후 처리시설 환경과 영양부추에서 위생지표세균(일반세균수, 대장균군, E. coli)과 병원성미생물(Escherichia coli O157:H7, Salmonella spp., Staphylococcus aureus, Listeria monocytogenes, Bacillus cereus)을 조사하였다. 그 결과, 빗, 칼, 도마 등 수확후 처리시설에서 사용하는 작업도구의 일반세균수 오염수준은 수확후 처리시설 설치농가(A, B)에서 수확후 처리시설 비설치농가(C) 보다 1.44~2.33 log CFU / 100$100cm^2$ 정도 낮았다. 특히 도마의 경우 A농가에서 1.00 log CFU / 100$100cm^2$이하, B 농가에서 2.23 log CFU / $100cm^2$인데 반해 C 농가에서는 6.03 log CFU / $100cm^2$로 농가간의 위생 상태에 따라 B. cereus의 오염수준이 차이가 크게 나타났다. 또한 지하수에 침지 한 영양부추에서 침지 전 보다 대장균군이 0.57~1.89 log CFU/g이 증가하였다. E. coli는 영양부추, 침지한 후 지하수, 토양에서 검출되었으며, E. coli O157:H7, Salmonella spp., L. monocytogenes는 검출되지 않았다. 따라서 본 연구의 결과를 통하여 소규모 수확 후 처리시설 설치와 위생교육을 통하여 농가 내 수확후처리 환경의 위생을 개선하는데 효과적이라 판단된다. 이와 더불어 유해미생물에 의한 식중독사고를 사전에 예방하기 위해서는 수확 후에 오염된 유해미생물을 저감화 할 수 있는 세척, 소독 기술의 개발과 도입이 필요할 것으로 사료된다.

• 농촌지도와개발
• /
• 제18권4호
• /
• pp.861-877
• /
• 2011

The purpose of this study is to survey job stress and Musculoskeletal Disorder(MSDs) of workers in small plants with agricultural products. The subjects were comprised of 69 workers participated in "Helping the rural women to get the small businesses" project. The questionnaire surveys were Korean Occupational Stress Scale(KOSS), and Legal Risk Assessment of Musculoskeletal Disorders(KOSHA CODE H-30-2003). As a result of the survey, scores of KOSS 8 sub-items except for job demand were similar to that of Korea workers. Prevalence of MSDs symptoms of small plants workers was high percent (44.9%). And the rate according to kinds of product was significant difference at neck (p<0.01), lumbar (p<0.01), and leg (p<0.01). There was no significant difference between view person sign of MSDs and non MSDs according to sex, year, the number of workers, working years, working time per one day, rest time per one day, and subjective working intensity, but there were significant difference between high stress group and low stress group about MSDs at interpersonal conflict(p<0.05). Job stress and MSDs were important factor to workers of small plants producted agricultural products. Therefore, starting a business with small plats, workers consider interpersonal conflict and body part showing MSDs.

• 소성∙가공
• /
• 제19권3호
• /
• pp.167-172
• /
• 2010

Roll-to-roll forming process is one of important metal processing technology because the process is simple and economical. These days, with these merits, roll-to-roll forming process is tried to be employed in manufacturing the circuit board, barrier ribs and solar cell plate. However, it is difficult to apply to the forming of micro scale or sub-micro scale pattern. In this study, the roll forming processing for the micro scale is designed and analyzed. The forming of micro pattern for small electric device such as LCD panel by incremental roll forming process is analyzed. Firstly, the optimum analysis conditions are found by several analyses. And then, formability is analyzed for various protrusion shapes at various forming temperatures. The formability is evaluated in terms of filling ratio and damage value. The filling ratio is defined from the tool geometry and critical damage is determined from the analysis of uniaxial tensile test. Finally, optimum forming conditions that guarantee the successful forming are found.

• 동력기계공학회지
• /
• 제13권6호
• /
• pp.129-136
• /
• 2009

A motor cylinder is widely used as an apparatus for transportation of a small scale load. It is, however, difficult for only one motor cylinder to transfer a large scale load such as a weir. The large scale load is transferred by two motor cylinders which are mounted on right and left of load itself. In this case, the displacement difference generated between two motor cylinders, namely, the synchronous error has a bad influence on the transportation. In this study, a synchronous control system is designed to restrain synchronous error caused by skew disturbance. The control system is composed of two disturbance observers and one synchronous controller. Each disturbance observer is designed to restrain the skew disturbance. And the synchronous controller is designed to achieve stable and accurate synchronization. Finally, the simulation results show that the designed control system is effective for the skew disturbance which lead to synchronous error.

• Journal of Forest and Environmental Science
• /
• 제30권1호
• /
• pp.91-100
• /
• 2014

This research was conducted on the conservation area of Baekdudaegan, Kangwondo under the purpose of evaluating bio-diversity according to the changes of spatial scale, using GIS data and spatial filtering method. The diversity index was calculated based on the information of species of The $5^{th}$ forest type map using Shannon-weaver index (H'), evenness index ($E_i$) and richness index ($R_i$). The diversity index was analyzed and compared according to the changes of 12 spatial scales from Kernel size $3{\times}3$ to $73{\times}73$ and basin unit. As for H' and $R_i$, spatial scale increased as diversity index decreased, while $E_i$ decreases gradually. H' and $R_i$ was highest; each 1.1 and 0.6, when the Kernel size was $73{\times}73$, while $E_i$ was 0.2, the lowest. When you look at according to the basin unit, for large basin unit, 'YeongDong' region shows higher diversity index than 'YeongSeo' region. For middle basin unit, 'Gangneung Namdaecheon' region, and for small basin unit, 'Gangneung Namdaecheon' and 'Gangneung Ohbongdaem' region shows high diversity index. When you look at the relationship between diversity index and Geographic factors, H' shows positive relation to curvature and sunshine factor while shows negative to elevation, slope, hillshade, and wetness index. Also $E_i$ was similar to the relationship between H' and Geographic factor. Meanwhile, $R_i$ shows positive relationship to curvature and sunshine factor, while negative to elevation, slope, hillshade, and wetness index. macro unit diversity index evaluation was possible through the GIS data and spatial filtering, and it can be a good source for local biosphere conservation policy making.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2008년도 하계학술대회 논문집
• /
• pp.547-549
• /
• 2008

This paper presents a implementation of the monitoring program for the analysis of electric consumption characteristics in home appliances, which uses a Labview program from National Instruments Corporation. It is can provide to be easy for small-scale researcher, development groups or individual researcher to analyze electric power consumption characteristics. Also, this paper apply to actual private home and then, analyze result of monitoring and a database result of power quality etc, like the power consumption form, power factor and harmonic which follow season, and time zone. For this measured the apartment where the family which is four lives in the object.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2001년도 하계학술대회 논문집 A
• /
• pp.112-115
• /
• 2001

Eigenvalue perturbation theory of augmented system matrix(AMEP) is a useful tool in the analysis and design of large scale power systems. This paper describes the application results of AMEP algorithm with respect to all controller parameter of KEPCO systems. AMEP for interarea and local mode can be used for turning controller parameter, and verifying system data and linear model of controller.

• 공업화학
• /
• 제10권7호
• /
• pp.1092-1095
• /
• 1999

기존의 혼산 공정으로 방향족 니트로 화합물을 얻는 방법은 묽은 황산이 주성분인 폐산을 처리해야 한다. 폐황산이 발생하지 않는 질산, 이산화질소와 오존을 사용하는 새로운 니트로화 공정을 3 mol 규모로 시험하였다. 디클로로에탄, p-니트로톨루엔 3 mol과 질산 6 mol의 혼합용액에 이산화질소 14.3 mol을 3번에 나누어 투입하고 오존을 0.871 mol/h의 유속으로 주입시키면 5.5시간만에 97% 이상의 전환율을 보였다. 이 방법은 일부 방향족 화합물의 니트로화 반응에서 기존의 혼산 공정을 대체할 수 있을 것이다.

• Wind and Structures
• /
• 제25권3호
• /
• pp.233-259
• /
• 2017

Investigations on simulated near-surface atmospheric boundary layer (ABL) in an open-jet facility are carried out by conducting experimental tests on small-scale models of low-rise buildings. The objectives of the current study are: (1) to determine the optimal location of test buildings from the exit of the open-jet facility, and (2) to investigate the scale effect on the aerodynamic pressure characteristics. Based on the results, the newly built open-jet facility is well capable of producing mean wind speed and turbulence profiles representing open-terrain conditions. The results show that the proximity of the test model to the open-jet governs the length of the separation bubble as well as the peak roof pressures. However, test models placed at a horizontal distance of 2.5H (H is height of the wind field) from the exit of the open-jet, with a width that is half the width of the wind field and a length of 1H, have consistent mean and peak pressure coefficients when compared with available results from wind tunnel testing. In addition, testing models with as large as 16% blockage ratio is feasible within the open-jet facility. This reveals the importance of open-jet facilities as a robust tool to alleviate the scale restrictions involved in physical investigations of flow pattern around civil engineering structures. The results and findings of this study are useful for putting forward recommendations and guidelines for testing protocols at open-jet facilities, eventually helping the progress of enhanced standard provisions on the design of low-rise buildings for wind.