• 농촌계획
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• 제21권2호
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• pp.127-135
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• 2015

In recent years, meteorological disasters have frequently occurred in rural areas. As a result, there have been growing concerns over the protective measures needed. In order to avoid natural risks and damage, and to strengthen countermeasure to meteorological disasters, local governments needs to be prepared. Therefore, this paper seeks to prevent meteorological disasters through mapping of inundation vulnerability in agricultural land, Chungcheongnam-do. In doing so, this study were considered 5 variables (i.e. precipitation, region of altitude below 50m, region of slope gradient is below 10 degree, distance from river within less 50m) for creating vulnerability map. The precipitation was excluded in five variables. Since, the precipitation which include Daily maximum precipitation, 2-Daily maximum precipitation, summer precipitation was not any correlation among them. The results of analysing four variables, exclusive of precipitation, were showed that the agricultural lands where located in Dangjin, Buyeo, Hongseong and Asan were low correlation of inundation vulnerability by overlapping analysis. Moreover, The correlation analysis was showed low correlation between each factors and the annual average area of agricultural lands' inundation, whereas, the correlation analysis which was overlapping each factor showed high correlation. In conclusion, in order to create reliable vulnerability map in agricultural lands, Chungcheongnam-do, it must be considered to overlap analysis of the four main factors such region of altitude below 50m, region of slope gradient is below 10 degree, distance from river within less 50m. We suppose that this study's analysis can help to set the preparedness site of agricultural lands inundation.

• 한국식품과학회지
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• 제31권5호
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• pp.1295-1299
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• 1999

CA 저장 중 후지 사과의 내부 기체 농도에 의한 저장 조건의 적합성을 신속하게 판단하기 위한 지표를 얻기 위하여 과실 내부 에틸렌과 이산화탄소의 농도에 따른 과육경도, 적정산도 및 과피 녹색의 유지정도를 조사하였다. 저장 중 사과의 내부 에틸렌 농도가 10ppm 이하에서는 과육경도, 적정산도 및 과피의 녹색이 거의 손실되지 않았으나 약 10ppm 이상에서는 급격하게 손실되었다. 저장 중 사과의 내부 이산화탄소 농도는 낮을수록 높은 과육경도, 적정산도 및 과피의 녹색을 유지하였는데 특히 내부 이산화탄소 농도가 2% 이하인 사과에서 높은 품질특성을 유지하였다 따라서 후지 사과의 CA저장에 적합한 저장조건은 사과의 내부 에틸렌과 이산화탄소 농도를 각각 약 10 ppm과 약 2% 이하로 유지할 수 있는 조건으로 판단되고, 사과의 내부 에틸렌과 이산화탄소 농도는 저장조건의 적합성을 판단하는 지표로 사용 가능하였다.

• Journal of Ecology and Environment
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• 제33권4호
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• pp.351-361
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• 2010

The primary purposes for using fire are to enhance marsh vegetation to support waterfowl, and to manage invasive plant species. The study was conducted for two consecutive years in 2004 and 2005, investigating the effects of prescribed fire regimes on vegetation biomass in tidal brackish marsh areas of the Blackwater National Wildlife Refuge located on the eastern shore of Maryland, USA, that are under relatively similar environmental conditions. Four different burn regimes (i.e., annual burn, 3-5 year burn, 7-10 year burn, and no burn) were applied in the study. Above- and below-ground vegetation biomass samples as affected by the different burn regimes were harvested in each year for five plant species native to the marsh; Distichlis spicata, Spartina alterniflora, Schoenoplectus americanus, Spartina cynosuroides and Spartina patens. No significant difference was found either in total above-ground biomass or in above-ground biomass by species between burn regimes in 2004. However, more total above-ground biomass was produced in annual burn regime in 2005 than in the other burn regimes. There were no consistent effects of burning on vegetative biomass production by species, but it seemed D. spicata was somewhat benefited by prescribed burning for its biomass production. Moreover, the stem density for D. spicata under annual burn regime was significantly higher than that in the other burn regimes, showing some positive effects of burning on vegetation. The below-ground biomass was significantly greater in 2004 than in 2005, yet with no significant difference between burn regimes in either year. A longer-term monitoring is strongly recommended.

• 한국산업보건학회지
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• 제20권1호
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• pp.63-69
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• 2010

This study was conducted to compare the concentration of various air contaminants in nine different laboratories during routine activities. Volatile organic compounds (VOC) were sampled and analyzed using NIOSH Method 1500 and asbestos fibers were sampled and analyzed using NIOSH Method 9002 and 7400. Detectable levels of acetone, toluene and ethanol were found in all the laboratories and xylene and n-hexane were detected in eight of the nine laboratories. All the VOC concentrations were well below the Korean Ministry of Labor's Exposure Limit and American Conference of Governmental Industrial Hygienists' (ACGIH) Threshold Limit Values (TLVs). Total VOC concentrations at the university laboratories were significantly higher than those at governmental agency laboratories. Airborne fiber concentrations were below 0.01 fibers/cc, while the concentration of chrysotile was 2% in insulation materials sprayed on the ceiling of one laboratory. While all the governmental agency laboratories (n=4) had fume hoods, two out of the five university laboratories did not have fume hoods. The capture velocity of half of the fume hoods were below the maintenance standard(0.4 m/sec). In conclusion, the study suggests that the current controls in place at both university and government agency laboratories are not sufficient in limiting exposure to harmful chemicals to non-detectable levels, though they appear to be adequate in protecting workers to levels below applicable occupational exposure limits. The study also suggests that researchers working in university laboratories may be exposed to greater levels of contaminant than those working in government agency laboratories.

• 한국전기전자재료학회논문지
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• 제23권5호
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• pp.397-402
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• 2010

In this paper, we studied WVTR(water vapor transmission rate) properties of $Si_3N_4$ thin film that was deposited using TCP-CVD (transformer coupled plasma chemical vapor deposition) method for the possibility of OLED(organic light emitting diode) encapsulation. Considering the conventional OLED processing temperature limit of below $80^{\circ}C$, the $Si_3N_4$ thin films were deposited at room temperature. The $Si_3N_4$ thin films were prepared with the process conditions: $SiH_4$ and $N_2$, as reactive gases; working pressure below 15 mTorr; RF power for TCP below 500 W. Through MOCON test for WVTR, we analyzed water vapor permeation per day. We obtained that WVTR property below 6~0.05 gm/$m^2$/day at process conditions. The best preparation condition for $Si_3N_4$ thin film to get the best WVTR property of 0.05 gm/$m^2$/day were $SiH_4:N_2$ gas flow rate of 10:200 sccm, working pressure of 10 mTorr, working distance of 70 mm, TCP power of 500 W and film thickness of 200 nm. respectively. The proposed results indicates that the $Si_3N_4$ thin film could replace metal or glass as encapsulation for flexible OLED.

• 한국축산시설환경학회지
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• 제2권2호
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• pp.147-154
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• 1996

In an attempt to recycle as feed or fertilizer, broiler litter containing rice hull was manually composted under the control of peak temperature of piles(uncontrolled or controlled below $70^{\circ}C$ or below $60^{\circ}C$) in each of three $1.0\;{\times}\;1.0\;{\times}\;1.2m$ dimensional facilities. Changes of nutritional and microbiological parameters were evaluated throughout the 8 weeks of processing period. The initial content of crude protein(29.6%) decreased to 17.8% after 8 weeks of composting. The rapid nitrogen(N) loss observed in the early phase was attributed mainly to non-protein-N(NPN) loss. The initial content of ash(19.1%) increased to $26{\sim}29%$ after 8 weeks. For toxic heavy metals, Cr, Pb, and Hg contents of final composts were far less than the maximum tolerance levels allowed in food or compost. Bacterial growth was rather depressed until the second week, increased thereafter, and reached to peak($10^{12}cfu$ level) at the 4th week of composting. With composting, actinomycetes were active at the level of $10^7\;to\;10^9$. Fungi were active during the first to third week of composting. In general, control of pile temperature below $70^{\circ}C$ did not remarkably alter the nutritional and microbiological parameters of broiler litter compost, compared to that of pile temperature below $60^{\circ}C$. Further researches on prevention from the rapid loss of NPN in the early phase of composting are required for more effective recycling of broiler litter.

• Journal of Periodontal and Implant Science
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• 제47권3호
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• pp.154-164
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• 2017

Purpose: Measurement of the root surface area (RSA) is important in periodontal treatment and for the evaluation of periodontal disease as a risk factor for systemic disease. The aim of this study was to measure the RSA at 6 mm below the cementoenamel junction (CEJ) using the Mimics software (Materialise, Leuven, Belgium). Methods: We obtained cone-beam computed tomography (CBCT) data from 33 patients who had visited the Department of Oral and Maxillofacial Radiology of Dankook University Dental Hospital. The patients comprised 17 men and 16 women aged from 20 to 35 years, with a mean age of 24.4 years. Only morphologically intact teeth were included in our data. Because the third molars of the maxilla and mandible have a high deformation rate and were absent in some participants, they were not included in our research material. Results: The CBCT data were reconstructed into 3-dimensional (3D) teeth models using the Mimics software, and the RSA at 6 mm below the CEJ was separated and measured using 3-Matic (Materialise). In total, 924 3D teeth models were created, and the area at 6 mm below the CEJ could be isolated in all the models. The area at 6 mm below the CEJ was measured in all teeth from the 33 patients and compared based on sex and position (maxilla vs. mandible). Conclusions: In this study, we demonstrated that it was feasible to generate 3D data and to evaluate RSA values using CBCT and the Mimics software. These results provide deeper insights into the relationship between periodontal inflammatory burden and systemic diseases.

• 대한의생명과학회지
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• 제8권1호
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• pp.7-11
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• 2002

This study was performed to investigate the infection status with Clonorchis sinensis metacercariae in Pseudorasbora parva from a tributary stream of Naktonggang (River) in Kangso-gu, Pusan. A total of 325 P. parva was collected in 4 sites using fish traps. They were transferred in the laboratory, measured the length and examined by artificial digestion method. In the site I, a total of 72 (80.0%) out of 90 fish examined was infected with 1~665 (112 in average) metacercariae of C. sinensis. The average number of metacercariae infected by the size of fish was 146 in the group of over 8 cm, 61 in 7.0~7.9 cm and 86 in below 6.9 cm. In the site II, a total of 50 (83.3%) out of 60 fish examined was infected with 1~178 (31 in average) metacercariae. The average number of metacercariae was 40 in the group of over 8 cm 35 in 7.0~7.9 cm, 23 in 6.0~6.9 cm and 25 in below 5.9 cm. In the site III, a total of 68 (97.1%) out of 70 fish examined was infected with 1~2,662 (508 in average) metacercariae. The average number of metacercariae was 679 in the group of over 7.0 cm, 444 in 6.0~6.9 cm and 426 in below 5.9 cm. In the site IV, a total of 103 (98.1%) out of 105 fish examined was infected with 1~1,536 (416 in average) metacercariae. The average number of metacercariae was 532 in the group of over 7 cm, 353 in 6.0~6.9 cm and 262 in below 5.9 cm. From the above results, it is confirmed that there are wide differences in the infection status of C. sinensis metacercariae in P. paeva according to investigation sites, and P. parva collected from the lower stream are more heavily infected than those from the upper stream.

• 동의생리병리학회지
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• 제23권3호
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• pp.723-733
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• 2009

The purpose of this study is to evaluate the difference about pathogenesis of normal group and depression group(who' pulmonary function is below expected value). Author used DSOM to investigate oriental pathogenesis. Depression group is consisted of people who's FVC%(forced vital capacity)is below 80% or $FEV_1$/FVC%(Forced Expiratory Volume in 1sec/FVC) is below 70%, and they don't have history of lung disease(Athma, tuberculosis, COPD, suchlike). Normal group is consisted of people who's FVC%(Forced Vital Capacity) is in 80-120% and $FEV_1$/FVC%(Forced Expiratory Volume in 1sec/FVC) is above 70%. they also don't have history of lung disease. Author carried out each group's PFT(pulmonary function test) by ATS(American Thoracic Society) method. DSOM was used for oriental pathogenesis investigation of two groups. There was significant difference between normal group and depression group in Kidney(p<0.05). In depression group comparison of sex, there was significant difference between male and female in stagnation of qi, cold, heat, spleen, phlegm(p<0.05). In Normal group there was significant difference between male and female in stagnation of qi, blood stasis, cold, heat, spleen(p<0.05). In depression group comparison of smoke, there was no significant difference between smoker and non-smoker(p<0.05). In Normal group comparison of smoke, there was significant difference between smoker and non-smoker in heat(p<0.05). This result showed difference of the pathogenesis between Depression group and Normal group.

• Fisheries and Aquatic Sciences
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• 제8권3호
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• pp.161-166
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• 2005

We examined the variation in survival and the respiration and filtration rates of Tresus keenae in response to changes in water temperature and salinity. The survivorship of animals exposed to temperatures below $25^{\circ}C$ for 7 days was $80\%$; however, all test animals died on the fourth day at $28^{\circ}C$. The upper lethal temperature over 7 days was $25.9^{\circ}C$. After exposure to lower temperatures, $93\%$ ofthe animals survived at temperatures over $5^{\circ}C$ for 10 days. Survivorship rapidly decreased below $4^{\circ}C$ with all test animals dying at $2^{\circ}C$ on the eighth day. The $LT_{50}$ over 10 days was $4.8^{\circ}C$. The respiration and filtration rates of T. keenae increased as temperature increased. It is believed that energy consumption increases as a result of the increased respiration rate at temperatures above the upper lethal temperature. At temperatures below the lower lethal temperature, the metabolic rate of T. keenae was substantially lowered. In response to changes in salinity, the survivorship of T. keenae was $90\%$ at 30.2 psu after exposure for 5 days; at below 26.8 psu, all test animals died by the fifth day. The $LS_{50}$ was 29.1 psu. As salinity decreased, both the respiration rate and the filtration rate decreased. At 23.5 psu, the respiration and filtration rates decreased by 48 and $34\%$, respectively. These data have implications for increasing efficiency in the production and management of shellfish aquaculture farms.