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박원정(Won-Jung Park),류화연(Hwa-Yeon Ryu),임가연(Ga-Yeon Lim),이영덕(Young-Duck Lee),박종현(Jong-Hyun Park) 한국식품과학회 2014 한국식품과학회지 Vol.46 No.2
신선편이식품 소재인 유기농산물의 미생물 분포와 품질을 평가하기 위해서 풋고추, 상추, 토마토, 사과, 배, 쌀 등의 농산물을 47개 지역에서 관행농 농산물과 동시에 현장에서 시료를 수집하였다. 일반 세균수로는 유기농 고추가 평균 4.07 log CFU/g, 관행농 고추는 3.71 log CFU/g 검출되었고 상추는 유기농, 관행농에서 6.76-6.90 log CFU/g로 분석되었다. 토마토와 사과는 2종류 시료에서 각각 2.08-2.92 log CFU/g, 0.70-0.82 log CFU/g로 검출되었다. 쌀도 유기농과 관행농 시료에서 2.92-2.98 log CFU/g 범위의 세균분포를 보여주었으나 유기농 배에서는 4.48 log CFU/g, 관행농 배는 2.84 log CFU/g의 분포도를 보여 주었다. 분석시료에 따라 미생물의 분포에 많은 차이를 보여 주었으며 유기농과 관행농산물의 미생물분포는 거의 차이가 없었다. 병원성 세균인 Cl. perfringens, E. coli O157:H7, L. monocytogenes, Salmonella, S. aureus은 전혀 검출되지 않았다. 그러나 유기농산물 2개(4%)와 관행농산물 3개(6%)에서 E. coil가 1.7 log CFU/g으로 검출되었고 B. cereus는 유기농 6개(13%)가 1.97 log CFU/g수준으로, 관행농 11개(23%)에서 1.04 log CFU/g 수준으로 검출되었다. 그러므로 유기농산물과 관행농산물에서의 일반세균과 병원성 세균의 오염정도는 차이가 거의 없고 이들 병원성 미생물의 오염수준도 비교적 낮아 안전한 것으로 판단된다. To analyze the presence of microbes in organic farm produce, green chillies, lettuce, tomatoes, apples, pears, and rice were collected at 47 production sites with organic and conventional produce. Total average bacterial counts of 4.07 log CFU/g in organic green chillies, 3.71 log CFU/g in conventional green chillies, and 6.76- 6.90 log CFU/g in the both lettuce were detected. Mean bacterial counts of 4.48 log CFU/g and 2.84 log CFU/g were detected in organic and conventional pear produce, respectively. Differences in bacterial counts in tomatoes, apples, and rice in organic and conventional produce were less pronounced. Clostridium perfringens, Escherichia coli O157:H7, Listeria monocytogenes, Salmonella spp., and Staphylococcus aureus were not detected in any produce sample. However, Bacillus cereus was detected with average counts of 1.04 log CFU/g in 11/47 (23%) conventional produce samples and 1.97 log CFU/g in 6/47 (13%) organic produce samples. Therefore, organic and conventional produce showed similar microbial prevalence patterns, and comparable safety in terms of pathogen contamination.
평활관과 낮은 핀관에서 R245fa의 풀 비등 열전달계수
박기정(Ki-Jung Park),이요한(Yohan Lee),임병덕(Byeongdeok Lim),정동수(Dongsoo Jung) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.3
In this work, pool boiling heat transfer coefficients(HTCs) of R22, R123, R134a, and R245fa are measured on both horizontal plain and 26 fpi low fin tubes. The pool boiling temperature is maintained at 7℃ and heat flux is varied from 80 ㎾/㎡ to 10 ㎾/㎡ with an interval of 10 ㎾/㎡. Wall temperatures are measured directly by thermocouples inserted through holes of 0.5 ㎜ diameter. Test results show that HTCs of high vapor pressure refrigerants are usually higher than those of low pressure fluids in both plain and low fin tubes. On a plain tube, HTCs of R245fa are 23.3% higher than those of R123 while on a 26 fpi low fin tube, HTCs of R245fa are 46.3% higher than those of R123. The fin effect is more prominent with low vapor pressure refrigerants than with high vapor pressure ones due to a sweeping effect.
기니 픽 회장 운동 기능에 미치는 Phosphodiesterase 4 형과 5 형 억제제의 효과
박효진(Hyo Jin Park),최성우(Sung Woo Choi),이영호(Yong Ho Lee),임정현(Jung Hyun Lim),이상인(Sang In Lee),박인서(In Suh Park) 대한소화기학회 2002 대한소화기학회지 Vol.39 No.5
Background/Aims: Intracellular cAMP or cGMP is degraded by cyclic nucleotide phosphodiesterase ( PDE) . We hypothesized that PDE inhibitors modulate the peristalsis and nerve- induced responses of the smooth muscle of the guinea pig ileum. Methods: To examine the effect of rolipram ( type 4 inhibitor of PDE) and zaprinast ( type 5 inhibitor of PDE) , we measured peristaltic amplitude, area under curve ( AUC) , and frequency of contractions from ileal preparation using the peristaltic bath. The mechanical activity of the circular muscle was measured with a clip attached, via the three sites of serosal surface, to the underlying circular muscle of intact ileum in the peristaltic chamber. In another set of experiment, muscle strips from the ileum were stimulated by an electrical field. The effects of rolipram, and zaprinast, on peristalsis and nerve- induced contraction were explored. Results: The amplitude and AUC of peristaltic contractions were significantly decreased in rolipram or zaprinast-treated group and frequency of contractions was significantly delayed in rolipram or zaprinast-treated group. The nerve- induced contraction of smooth muscle was significantly decreased in rolipram-treated group. Conclusions: These observations suggest that PDEs may play a role in the modulation of peristaltic behavior of the ileum and PDE inhibitors may be used in the treatment of hyperkinetic bowel disorders. ( Korean J Gastroenterol 2002; 39: 343- 349)
공개공지효용성제고(公開空地效用性提高)를 위한 설계지침개선방안(設計指針改善方案)
박정임 ( Jung Lim Park ),김현준 ( Hyun Jun Kim ),권영휴 ( Young Hyoo Kwon ) 한국환경복원기술학회 2011 한국환경복원기술학회지 Vol.14 No.3
In urban space, public space is publicly or privately owned space freely accessible by the public. Privately owned public space to the public hosts small-scale rest facilities to serve the public in buildings of certain purposes and sizes for the sake of pleasant urban environment. The Building Act and building ordinances formulate a set of criteria for management and easement of construction standards as well as the area. When creating privately owned public space, one can get incentives through the easement of floor space index and height limit. The purposes of this study were to investigate and analyze privately owned public open space, which is freely accessible by the public, and its adjacent streets and to propose plans to improve the regulations for securing privately owned public space for more rational and practical legal applications. The study then proposed some plans to help to increase the quality of privately owned public space including applying the coefficient to suggest the type of privately owned public space fit for the features of the streets and measure the appropriate utility level differently and distinguishing the mandatory items according to the facility regulations in privately owned public space from the ones qualified for additional points in case of installation. The types of privately owned public open space should be applied differently and the content of facilities intended should be different according to whether it will serve as a resting place or grant more importance on traffic by walking, depending on the features of its adjacent streets. The privately owned public space, the frontage space of building, and the adjacent sidewalks should become a whole and be regarded as one space from the integrated perspective. The results of the study claim further significance in that it investigated privately owned open space and roadside across Seoul. They will serve as useful data to solve the problems with the privately owned public space of the city, which destroys spatial continuity by focusing on the quantitative increase of privately owned open space and creating individual privately owned open spaces and builds high-rise buildings alienated from the existing spaces, and to increase the quality of future privately owned public space.
탄약고 폭발 사고로 기인한 환경영향권 검토에 관한 연구
박정봉(Jung Bong Park),조상호(Sang Ho Cho),박훈(Hoon Park),임대규(Dae Gyu Lim),신영철(Young Cheol Shin) 한국방재안전학회 2016 한국방재안전학회 학술대회 논문집 Vol.2016 No.-
대량의 고성능 폭약 및 폭탄이 저장된 저장소(이하 탄약고)는 예기치 않은 폭발사고가 인접한 보안물건에 미치는 피해를 최소화하기 위하여 다양한 안전장치를 구비하고, 일정 안전거리를 확보하도록 법으로 규제하고 있다. 국내의 경우, 탄약고의 폭발사고로부터 발생할 수 있는 지반진동 및 폭풍압 등과 같은 환경 피해에 대한 정량적인 평가 및 3차원 예측 시뮬레이션 관련 연구결과가 극히 제한적으로 공개되어 있어 현행 관련 법규에서 제시된 규제내용의 적합성 여부를 판단하기 어렵다. 이에 따라 본 연구는 탄약고 내 일정 정체량의 폭약이 폭발 시 발생될 수 있는 환경 영향적인 요소를 정량적으로 평가하는데 그 목적이 있다. The storage structure of large amount of high explosives and bombs (hereinafter referred to as ammunition ) is regulated by law to ensure a safety distance which minimizes the environmental damage by unexpected explosions in the storage. In Korea, there are a few case studies on quantitative evaluation and 3 dimensional simulation of environmental damages by explosion induced ground motion and air blast from explosion accident in ammunition storage. The purpose of this study is to quantitatively evaluate the environmental impacts caused by explosives accident in the ammunition.
박정일(Park Jung Il),박민호(Park Min Ho),임이택(Lim Ri Teak) 한국지적정보학회 2010 한국지적정보학회 학술발표대회 논문집 Vol.2010 No.11
신ㆍ재생에너지는 오염원이 없는 천연에너지다. 오늘날 에너지 가격의 급등과 지구 온난화에 대비하기 위해 각국은 에너지 효율화와 절약, 원자력발전소의 증설, 신재생에너지의 개발과 보급 확대 정책 등을 추진하고 있다. 신재생에너지의 개발과 투자 못지않게 중요한 것이 발전 효율성이다. 신재생에너지는 초기 설비 투자비용이 많이 소요되는 것이 단점인데, 장기적으로 투자비용 이상의 에너지를 생산해 낼 수 있어야 한다. 신재생에너지의 대부분이 청정연료인 자연을 이용하고 있는 것이 많기 때문에 자연 환경적인 요인이 많이 작용하게 된다. 본 연구는 다양한 신재생에너지 중 지형요인 및 기후요인과 관련이 높은 태양광, 풍력의 입지 선정에 초점을 맞추어 입지 요인 선정, 기준 수립, 적지분석에 이르기까지 GIS를 활용하는 과정에 대하여 연구하고, 적용하고자 하였다. New renewable energy is the natural source energy without pollution. Recently, the necessity new renewable energy is emerging since of less green hose gas emissions. However, a survey or research on the new renewable energy system has been hardly performed. It’s not easy to find a appropriate location in consideration of environment. In this study, we intended to analyze the spatial equity and distribution characteristics of new renewable energy and to select several potential facility sites required in the study area using GIS’s spatial analysis functions. Finally this study analyzes the possible location of the new renewable energy in terms of objective criteria and Spatial Correlation Analysis techniques.
박민재(Minjae Park),김대경(Dae-Kyung Kim),김종운(Jong-Woon Kim),박동호(Dong Ho Park),박병노(Byoung-Noh Park),박종훈(Jong Hun Park),송미옥(Mi-Ok Song),성시일(Si-Il Sung),정기문(Ki Mun Jung),임재학(Jae-Hak Lim) 한국신뢰성학회 2021 신뢰성응용연구 Vol.21 No.3
Purpose: We developed a multicriteria decision model to assist decision-makers in determining the optimal inspection intervals based on a set of competing criteria, such as cost, downtime, and availability. Methods: A procedure based on multiattribute utility theory is proposed for developing the model. The proposed approach can simultaneously determine the optimal inspection intervals for monitoring the failure behavior of systems trails to be inspected, maintainability features, and decision-maker preferences for cost, downtime, and availability. Results: We determined the optimal inspection intervals for periodic condition monitoring based on delay time analysis and a multicriteria framework. Conclusion: We developed a multicriteria decision model that includes cost, downtime, and availability for consequences that have multiple dimensions to be considered.