• 한국약용작물학회지
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• 제26권1호
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• pp.55-63
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• 2018

Background: The present study assessed the response of kenaf (Hibiscus cannabinus L., Jangdae) seed to NaCl and the effects of polyethylene glycol (PEG) on kenaf seed germination and vigor. Methods and Results: Seed germination ranged from 11.3% to 58.8% after 24 hours of immersion in NaCl concentrations from 0% to 0.5%. The priming treatments had lower electrical conductivity (EC) values for the seeds than for the control and a deteriorated palisade layer. Priming in 10% PEG for 48 hours increased the germination upto 96.3% in $H_2O$ solution and 98.8% in 0.3% NaCl solution compared to that of the control (78.8%). Germination synchronization, and shoot and root growth of the primed seeds were greater than those of the control. The $T_{50}$ of the control in $H_2O$ and 0.3% NaCl solution was 22 and 28 times, respectively. After priming, nine times was sufficient to reach $T_{50}$ in both solution. The mean number of days to germination (MDG) decreased from 1.43 days for the control to 0.55 days for 0% PEG in $H_2O$ solution and from 1.57 days for the control to 0.56 days for 0% PEG in 0.3% NaCl solution. The dry weight after the 10% PEG treatment was higher than that of the control. Conclusions: Taken together, 10% PEG treatment for 24 hours is recommended for kenaf seed invigoration before planting.

• Nutrition Research and Practice
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• 제5권5호
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• pp.389-395
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• 2011

In the present study, a suitable drying method was developed for citrus press cakes (CPCs), which are produced as a by-product in citrus juice plants, and the protective effect of methanol extract of CPCs prepared by far-infrared radiation (FIR) drying against $H_2O_2$-induced DNA damage was evaluated versus that of freeze-dried CPCs. Methanol extract of FIR-dried CPCs exhibited comparatively good ROS scavenging activity versus the freeze-dried CPCs at the concentration of 100 ${\mu}g$/mL. The extract strongly enhanced the cell viability against $H_2O_2$-induced oxidative damage in Vero cells. Lipid peroxidation inhibitory activity of the extract from FIR-dried CPCs was comparable to that of the extract from freeze-dried CPCs. This sample also exhibited good protective effects against $H_2O_2$-mediated cell apoptosis as demonstrated by decreased apoptotic body formation in the nuclear staining with Hoechst 33342. In the comet assay, the CPC extracts exhibited strong inhibitory effects against $H_2O_2$-mediated DNA damage in a dose-dependent manner. Thus, this study demonstrated that FIR drying effectively preserves CPC as a functionally important natural antioxidant source and the FIR drying can be adapted for drying CPCs and is more economical for massive production than freeze drying.

• 보건의료산업학회지
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• 제6권4호
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• pp.27-36
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• 2012

This study was to identify oral health status, O'Leary index and OIDP for the preventive oral prophylaxis among adults who visited dental hospitals or clinics from 30th September in 2011 to 31th May in 2012. The results are as follows. In DMFT, female(8.79) was higher than male(7.65)(p<.05). Housewife(9.70) and agriculture fishery industry was higher than others(p<.01). In O'Leary index, male(47.41), over 50 years old and 200~300 million won were higher than others. but these results wasn't significantly different. The majority answer about discomfort feeling in OIDP was during meal(66.7), and period of discomfort was 1~2 time/month(29.6). The discomfort feeling in OIDP effected on meal(40.8)and teeth brushing(50.0). The difficulty in daily life were toothache(21.0), cold feeling(20.8), and crowding(19.3). In conclusion, the negative factor of oral health status didn't effect daily life. These findings are require of development of oral health management program which included the prevention of toothache and cold feeling.

• Journal of Ecology and Environment
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• 제41권12호
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• pp.328-335
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• 2017

Background: Some researchers have attempted to evaluate the ecological function of various additional services, away from the main point of view on the timber production of Korean forests. However, basic data, evaluation models, or studies on the absorption of air pollutants related to major plant communities in Korea are very rare. Therefore, we evaluated the functional value of the forest ecosystem in Gongju-city. Plantation manual for air purification, supplied from the Ministry of Environment in Japan, was referred to process and method for assessment of air pollutant absorption. Results: Gross primary production was calculated about average 18.2 t/ha/year. It was a relatively low value in forests mixed with deciduous broad and evergreen coniferous compared to pure coniferous forest. Net primary production was the highest value in deciduous coniferous and was the lowest value in mixed forest with deciduous broad and evergreen broad. And the mean sequestration amount of each air pollutant per unit area per year assessed from gross primary production and concentration of gas was the highest with 75.81 kg/ha/year in $O_3$ and was 16.87 and 6.04 kg/ha/year in $NO_2$ and $SO_2$, respectively. In addition, total amounts of $CO_2$ absorption and $O_2$ production were 716,045 t $CO_2$/year and 520,760 t $O_2$/year in all forest vegetation in Gongju-city. Conclusions: In this study, we evaluated the absorption ability of air pollutant in 2014 on forest in Gongju-city area. Gongju-city has the broad mountain area about 70.3%, and area of deciduous broad leaves forest was established the broadest with 47.4% of genus Quercus. Pg was calculated about average 18.2 t/ha/year. The mean sequestration amount of each air pollutant per unit area per year assessed from Pg and $C_{gas}$ was the highest with 75.81 kg/ha/year in $O_3$ and were 16.87 and 6.04 kg/ha/year in $NO_2$ and $SO_2$, respectively. Absorption rates of $O_3$, $NO_2$, and $SO_2$ were the highest in evergreen coniferous forest about $14.87kgO_3/ha/year$, $3.30kgNO_2/ha/year$, $1.18kgSO_2/ha/year$, and the lowest were $5.95kgO_3/ha/year$, $1.32kgNO_2/ha/year$, and $0.47kgSO_2/ha/year$ in deciduous broad forest. In conclusion, it was evaluated that Japanese model is suitable for estimating air pollutants in Japan to Korean vegetation. However, in Korea, there is a very limited basic data needed to assess the ability of forests to absorption of air pollutants. In this study, the accuracy of a calculated value is not high because the basic data of trees with similar life form are used in evaluation.

• 한국정보과학회논문지:시스템및이론
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• 제30권1호
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• pp.12-21
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• 2003

본 논문에서는 가치함수를 가지면서 동적으로 도착하는 IRIS(Increasing Reward with Increasing Service) 실시간 태스크들의 총 가치를 최대화하기 위한 온-라인 스케줄링 알고리즘을 제안한다. 본 논문은 스케줄링 알고리즘의 성능향상에 역점을 두고 있으며, 이는 다음 두 가지 아이디어를 기반으로 한다. 첫째, 총가치를 최대화하는 문제는 가치함수들의 최대 도함수 값들 중 최소 값을 찾는 문제를 해결함으로써 풀 수 있다는 것이다. 둘째, 새로운 태스크가 도착하기 전까지 이 전에 스케줄된 태스크들 중 소수만이 실제 실행되고, 나머지는 새로 도착한 태스크와 함께 다시 스케줄링 된다는 사실을 발견하고, 매 스케줄링 시 모든 태스크들을 스케줄링하는 것이 아니라, 일부 태스크들만 스케줄링하자는 것이다. 제안 알고리즘의 성능은 다양한 경우에 대한 모의실험으로 검증되었다. 실험 결과 제안 알고리즘의 계산 복잡도는 최악의 경우 기존 알고리즘과 동일한 $O(N_2)$이지만, 평균적으로 이 보다 낮은 O(N)에 가까운 것으로 확인되었다.

• 한국통신학회논문지
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• 제37권6B호
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• pp.405-413
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• 2012

서비스 품질을 보장하기 위해 널리 사용되는 WFQ(Weighted Fair Queuing)는 엄격한 지연한계를 요구하는 저속 트래픽 흐름의 경우 자원 이용도가 아주 나빠지는 구조적인 한계를 갖고 있다. 이러한 WFQ의 문제점은 최적화 되지 않은 트래픽 흐름의 레이턴시에 기인하는 것으로 밝혀졌고, 최적 레이턴시를 실현하여 자원 이용도를 높일 수 있는 LOFQ(Latency-Optimized Fair Queuing) 가 도입되었다. 그러나 LOFQ는 새로운 흐름을 수락할 때마다 모든 흐름에 대해 최적의 레이턴시를 재 설정해야 하므로 흐름 수락시 O($N^2$)의 복잡도를 가져 구현에 어려움이 있다. 본 논문은 이러한 복잡도를 O(1) 수준으로 낮추는 방식을 제안한다. 제안된 방식은 가해진 트래픽 부하의 서비스 품질의 통계적인 특성을 이용하여 최적 레이턴시 지수 함수를 구한 후 이 함수를 이용하여 도착 흐름의 최적 레이턴시 지수를 간단하게 구하는 것이다.

• 한국건설순환자원학회논문집
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• 제6권2호
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• pp.108-114
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• 2018

콘크리트 구조물은 사용기간 동안 표면 열화 및 오염으로 인해 미관의 저하 및 내구성 저하가 발생된다. 최근 들어 광촉매(photocatalyst)를 이용하여 유기산화물을 제거하고 표면자기정화(self cleaning) 성능을 개선하려는 연구가 시도되고 있다. 본 논문은 실리케이트 기반 광촉매 함침을 위한 기초연구로서 CS와 SC 두 가지 함침 용액을 대상으로 하였다. 실리케이트 기반 용액의 점성과 표면장력을 평가하였으며 콘크리트에 적용하여 부착강도를 평가하였다. 또한 실리케이트 용액에 침지된 콘크리트에 대하여, 광촉매 용액의 침지 및 분무를 한 후 콘크리트 강도 평가와 SEM을 통한 표면상태를 조사하였다. 실리케이트 용액의 침지 후 30분간 기건 상태를 유지하고 분무하는 방법이 가장 효과적으로 광촉매의 표면 흡착을 유도하는 것으로 평가되었으며, 강도 개선에도 효과적임을 알 수 있다.

• Ocean and Polar Research
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• 제35권3호
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• pp.229-237
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• 2013

We measured two-dimensional (2-D) oxygen distribution in the surface sediment layer of intertidal sediment using a simple and inexpensive planar oxygen optode, which is based on a color ratiometric image approach. The recorded emission intensity of red color luminophore light significantly changed with oxygen concentration by $O_2$ quenching of platinum(II)octaethylporphyrin (PtOEP). The ratios between the intensity of red and green emissions with oxygen concentration variation demonstrated the Stern-Volmer relationship. The 2-D oxygen distribution image showed microtopographic structure, diffusivity boundary layer and burrow in surface sediment layer. The oxygen penetration depth (OPD) was about 2 mm and the one-dimensional vertical diffusive oxygen uptake (DOU) was 12.6 mmol $m^{-2}d^{-1}$ in the undisturbed surface sediment layer. However, those were enhanced near burrow by benthic fauna, and the OPD was two times deeper and DOU was increased by 34%. The simple and inexpensive oxygen planar optode has great application potential in the study of oxygen dynamics with high spatiotemporal resolution, in benthic boundary layers.

• The Korean Journal of Legal Medicine
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• 제42권4호
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• pp.146-152
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• 2018

We investigated the neural correlates of accurate eyewitness memory retrieval using functional near-infrared spectroscopy. We analyzed oxygenated hemoglobin ($HbO_2$) concentration in the prefrontal cortex during eyewitness memory retrieval task and examined regional $HbO_2$ differences between observed objects (target) and unobserved objects (lure). We found that target objects elicited increased activation in the bilateral ventrolateral prefrontal cortex, which is known for monitoring retrieval processing via bottom-up attentional processing. Our results suggest bottom-up attentional mechanisms could be different during accurate eyewitness memory retrieval. These findings indicate that investigating retrieval mechanisms using functional near-infrared spectroscopy might be useful for establishing an accurate eyewitness recognition model.

• 한국수의병리학회:학술대회논문집
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• 한국수의병리학회 2005년도 Proceedings of The 2nd Asian Society of Veterinary Pathology Symposium(Vol.2) and 2005 Annual Meeting of The Korean Society of Veterinary Pathology(Vol.9)
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• pp.72.1-73
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• 2005