• 대한의용생체공학회:의공학회지
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• 제44권2호
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• pp.147-156
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• 2023

Efforts to employ smart home sensors to monitor the indoor activities of elderly single residents have been made to assess the feasibility of a safe and healthy lifestyle. However, the bathroom remains an area of blind spot. In this study, we have developed and evaluated a new edge computer device that can automatically detect water usage activities in the bathroom and record the activity log on a cloud server. Three kinds of sound as flushing, showering, and washing using wash basin generated during water usage were recorded and cut into 1-second scenes. These sound clips were then converted into a 2-dimensional image using MEL-spectrogram. Sound data augmentation techniques were adopted to obtain better learning effect from smaller number of data sets. These techniques, some of which are applied in time domain and others in frequency domain, increased the number of training data set by 30 times. A deep learning model, called CRNN, combining Convolutional Neural Network and Recurrent Neural Network was employed. The edge device was implemented using Raspberry Pi 4 and was equipped with a condenser microphone and amplifier to run the pre-trained model in real-time. The detected activities were recorded as text-based activity logs on a Firebase server. Performance was evaluated in two bathrooms for the three water usage activities, resulting in an accuracy of 96.1% and 88.2%, and F1 Score of 96.1% and 87.8%, respectively. Most of the classification errors were observed in the water sound from washing. In conclusion, this system demonstrates the potential for use in recording the activities as a lifelog of elderly single residents to a cloud server over the long-term.

• 한국식품영양학회지
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• 제9권3호
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• pp.259-264
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• 1996

Five different liquid sugars, invert sugar, corn syrup, high fructose corn syrup, sorbitol and oligosaccharide were compared to improve the shelf life of sponge cake and to decrease the contamination of microorganisms in the baking plant. Sucrose was used as a control. The use of 40% of liquid sugar was more effective than that of 20% on the staling and softness. Invert sugar showed the lowest water activity and the highest water holding capacity. Oligosaccharide showed the highest water activity and the lowest water holding capacity among loquid sugars used. 20% of replacemint of sucrose with invert sugar decreased the contamination more than 100% of sucrose.

• 한국식품영양학회지
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• 제34권2호
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• pp.137-145
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• 2021

This study was conducted in order to investigate the antioxidant and antimicrobial activity of Solanum nigrum L. fruit powder after undergoing different extraction solvent processes. The total phenolic content of Solanum nigrum L. fruit powder measured a 14.66 GAE mg/g after undergoing ethanol extraction, and the total flavonoid content measured at 201.23 mg CE/g when undergoing ethanol extraction. The ABTS radical scavenging activity was 160.38~209.53 TEAC umol/g, and the DPPH radical scavenging activity was 53.99~90.76 TEAC umol/g, which indicated a higher level of antioxidant power in the ethanol extract as opposed to in the water extract. The FRAP (ferric reducing antioxidant power) of Solanum nigrum L. fruit powder was 115.58~194.58 TEAC umol/g, and B. subtilis KCTC 2189 showed greater antimicrobial activity in the ethanol extract (concentration 200 ug/uL) as opposed to the water extract. Solanum nigrum L. fruit powder revealed differences in antioxidant and antimicrobial activity between the different extraction solvents. In particular, ethanol extract had higher antioxidant and antibacterial activity, meaning it is more favorable for usage as a functional food material.

• Spatial Information Research
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• 제19권1호
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• pp.61-72
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• 2011

전 지구적 기후변화인 지구온난화의 주원인으로 지목되고 있는 온실가스는 공간적으로 주로 도시에서 발생하고 있기 때문에 도시차원에서의 대책이 무엇보다 필요하다. 본 연구는 도시형태와 탄소발생량과의 관계를 분석하여 기후변화에 대응한 탄소배출저감형 도시의 형태를 제시하는 것을 궁극적인 목표로 삼고 있다. 이를 위해, 첫째로 도시형태에 대한 이론고찰을 수행하여 도시공간의 물리적 규모, 이용현황, 활동강도와 관련된 도시형태요소를 선정하였다. 둘째, 서울시를 사례로 전력, 도시가스, 지역난방, 석유, 상수도 사용량 자료를 이용하여 이산화탄소 배출량 지도를 작성하였다. 셋째, 이산화탄소 배출량과 도시형태요소와의 관계를 분석하여 도시공간에서 에너지 사용량에 영향을 주는 도시형태를 밝혀내고, 도시계획 측면에서의 시사점을 도출하였다. 본 연구에서 도시형태 요소와 이산화탄소 배출량간의 관계를 분석한 결과는 실제 에너지 사용량에 기반하여 이산화탄소 배출량을 산정하여 활용하였다는 점에서 기존 연구가 지닌 한계를 극복하고, 사례분석을 통해 구체적이고도 결과를 도출하였다는데 그 의의가 있다.

• Food Science and Biotechnology
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• 제17권1호
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• pp.46-51
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• 2008

The objective of this study was to investigate antioxidant activities of freeze-dried, main root, and fine root of ginseng (Panax ginseng CA. Meyer), which were extracted with various solvents including ethanol, methanol, and water. Ethanol extracts in both parts showed the most powerful scavenging activities against DPPH radicals. Especially, ethanol extract of fine root had higher reducing power and antioxidant capacity than that of main root. The highest antioxidant activity in linoleic acid emulsion system was also observed in fine root extracted with ethanol, followed by methanol and water. Both ferrous ion chelating activity and ferric reducing antioxidant power (FRAP) of extracts were increased with the increase of extracts concentration. These results suggest that ethanol extract of fine root of ginseng has the most effective antioxidant capacity compared to the methanol and water extracts tested in the present study. Thus it can be applied for the effective extraction of functional material from ginseng for the usage of pharmaceutical and/or food industries.

• 대한토목학회논문집
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• 제39권3호
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• pp.431-439
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• 2019

여의도 샛강은 1997년 국내최초 생태공원으로 조성된 이후 이용 활성화를 위한 다양한 노력이 투입되었음에도 불구하고 현재의 이용 현황은 인근 한강 공원과 비교했을 때 현저히 저조한 상황이다. 본 연구에서는 샛강 방문자 1,000명을 대상으로 면접 설문조사를 진행하였으며, 이용자들의 샛강에 대한 인식과 활동 패턴 등에 대해 조사하였다. 그 결과 전체 이용자 중 약 60 %가 도보를 이용한 인근 주민이었고, 대부분 가벼운 운동이나 산책을 하며 시간을 보내는 등 일반 서울시내 도시공원과 유사한 특성을 갖는 것으로 나타났다. 또한 다양한 통계분석을 통해 응답자 특성에 따른 샛강에 대한 인식과 활동 패턴 차이를 분석하였으며, 샛강에서의 활동 패턴이 샛강에 대한 만족도, 애착심, 참여의식 등에 미치는 영향에 대해 분석하고 고찰하였다.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2019년도 춘계학술대회
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• pp.105-105
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• 2019

Dendropanax morbifera H.Lev is an evergreen tree that lives in subtropical climates. About 75 species of D. morbifera live in East Asia, but only one species live in Korea(Korean dendropanax). D. morbifera belonging to Aralicacae family 98% of D. morbifera are distributed in Jeollanam-do in the Korea and the grow wild in Gyeongsangnam-do and Jeju Island. The harvest time and usage of D. morbifera were recorded in traditional medicinal books. The roots and stems of D. morbifera had been used for traditional medicine to treat migraine, menstrual irregularity and skin disease. And D. morbifera leaves are contain flavonoids and polyacetylene compounds. In this study, we were investigated the physiological activity of D. morbifera by different areas collected at the same time, and compared to characteristics of plants. D. morbifera collected from Jeollanam-do (Goheung-gun), Gyeongsangnam-do (Namhae-gun) and Jeju Island, and dried at $50^{\circ}C$ for three days. We used dried D. morbifera powder for antioxidant tests. Each sample was extracted with hot water under the same conditions. The contents of total polyphenols and total flavonoids from D. morbifera were identified. Also, we performed to DPPH radical scavenging activity, ABTS cation radical scavenging activity and Superoxide anion scavenging activity efficacy for antioxidant activity determination. The contents of total polyphenols and total flavonoids in hot water extract of D. morbifera harvested from Gyeongsangnam-do and Jeollanam-do were higher than Jeju. However, D. morbifera harvested from Gyeongsangnam-do and Jeollanam-do showed no significant difference those content of total polyphenols and total flavonoids. And the antioxidant capacity was showed the similar patterns in antioxidant activity.

• Preventive Nutrition and Food Science
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• 제16권4호
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• pp.321-327
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• 2011

Water, methanol and ethanol extracts of ginseng leaves were assayed for total phenolics and flavonoids, ascorbic acid, cupric and ferrous ion chelating activities, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, ferric reducing antioxidant power (FRAP) assay and ABTS radical cation decolourization (TEAC) assay for their antioxidant properties. The ethanol extract of ginseng leaves contained significantly (p<0.05) higher amounts of total phenolics and flavonoids (600.57 and 1701 mg/100 g) than methanol (374.43 and 1512.64 mg/100 g) and water extracts (248.30 and 680.05 mg/100 g). Among solvent extracts of ginseng leaves, the ethanol extract showed the most powerful antioxidant activities. However, the ferrous ion chelating activity of ginseng leaf extracts were lower than the cupric ion chelating ability. These differences in concentrations of key antioxidants among various solvent extracts seemed to be responsible for their differences in antioxidant activities. These results suggest that ethanol extract of ginseng leaves has the most effective antioxidant capacity compared to the methanol and water extracts tested in the present study. Thus, it can be applied for the effective extraction of functional material from ginseng leaves for the usage of pharmaceutical and/or food industries.

• 생약학회지
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• 제23권2호
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• pp.89-95
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• 1992

The water extract of Gamidaebo-Tang depressed the lethal toxicity of cis-platin$(45{\mu}M/kg,\;s.c.)$, and mitomycin C (6mg/kg, s.c.). Significant depression of renal toxicity(indicated by an increased blood urea nitrogen value and creatinine value) of cis-platin $(35{\mu}M/kg)\;s.c.)$, was observed in mice treated with Gamidaebo-Tang. In rats treated with mitomycin C and Gamidaebo-Tang, the increased LDH activity and reduced total protein and albumin contents by mitomycin C were significantly depressed. The number of WBC was significantly increased in rats treated with mitomycin C but in the rats treated with mitomycin C and Gamidaebo-Tang, the number of WBC was increased and the hematocrit value and the number of RBC and Hgb were significantly increased in the dose-dependent manner. Therefore, bone marrow toxicity of mitomycin C in the rats treated with Gamidaebo-Tang was depressed. In the end, alleviative effects of the side actions of cis-platin and mitomycin C were acknowledged by combined usage of Gamidaebo-Tang and these anti-neoplastic drugs.

• 생명과학회지
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• 제25권4호
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• pp.425-432
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• 2015

각각의 나라는 민족의 공감성과 문화성이 깃든 고유의 술을 가지고 있으며, 우리나라에는 고유의 전통주 막걸리(탁주)가 있다. 본 연구에서는 주박을 이용한 고부가가치 향장소재 개발을 목표로, 상업적 시설에서 대량생산된 우국생 주박의 ethanol 및 열수 추출물로부터 n-hexane, ethylacetate, butanol을 이용한 순차적 유기용매 분획물과 물 잔류물을 조제한 후, 이들의 혈액응고 저해활성, 혈소판 응집저해 활성 및 인간 적혈구 용혈활성 및 항산화 활성을 평가하였다. 우국생 주박의 수분함량은 80.3%, pH 3.94, brix 13.0 및 알코올 함량은 약 1.8%이었으며, ethanol 추출의 경우 추출효율은 6.62%로 열수 추출의 2.1%보다 3.15배 높은 수율을 나타내었다. 총폴리페놀 및 총플라보노이드 함량 분석결과 주박 ethanol 추출물의 ethylacetate 분획물에서 가장 높은 함량을 나타내었으며, 특히 폴리페놀 함량은 매우 높게 나타났다(128 mg/g). 혈액응고 저해활성을 평가한 결과, ethanol 추출물의 ethylacetate 분획물에서는 5 mg/ml 농도에서 TT, PT, aPTT 모두 15배 이상의 연장된 응고시간을 나타내어 매우 강력한 thrombin, prothrombin 및 coagulation factor 저해활성을 나타내었다. 혈소판 응집저해능 평가에서는 ethanol 추출물의 butanol 분획 및 물 잔류물에서 항혈전제로 사용되고 있는 aspirin 보다 우수한 응집저해능을 확인하였다. 상기 10종 시료들은 0.5 mg/ml 농도까지 적혈구 용혈활성이 나타나지 않았으며, 양호한 radical 소거능을 나타내었다. 본 연구결과는 사료 및 비료로 활용되고 있는 우국생 주박의 활성분획물을 이용하는 경우 고부가가치 항혈전제 개발이 가능함을 제시하고 있다.