• 한국산림과학회지
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• 제95권6호
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• pp.672-679
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• 2006

밤의 이용가치를 높이기 위하여 밤 과실의 등급화 및 규격화에 필요한 정확한 품질평가 기준을 확립하고자 대보 등 13개 주요 재배품종을 대상으로 수확직후의 과실품질 및 저온저장 기간에 따른 밤 과실의 당도와 과육정도의 변화를 조사하였다. 2001년부터 2005년까지 수확 직후의 밤 과실을 대상으로 밤의 품질을 크게 좌우하는 입중, 당도, 과육경도, 열과율, 다배율을 조사한 결과, 각 형질에 있어서 품종간에 큰 차이가 있었으며 동일한 품종에서도 해마다 상당한 변이가 관찰되어 유전적인 요인 외에도 환경적인 영향을 많이 받는 것으로 나타났다. $2^{\circ}C$에서 16주간 저장하면서 4주 간격으로 당도변화를 조사한 결과 저장기간에 따라 상당한 차이가 나타났으며, 출운 품종의 경우 당도가 저장 16주째에 수확직후보다 8%나 증가되었다. 조생종을 제외한 대부분의 품종에 있어 저온저장 12주까지는 당도가 증가하였으나 그 이후에는 점차 감소하였다. 저온저장 중 과육정도는 석추품종을 제외하고는 기간이 경과함에 따라 약간 증가하였으나 유의성은 인정되지 않았다. 이상의 연구결과로부터 얻어진 주요 재배품종에 대한 과실품질 자료는 밤 재배지는 물론 육종가 등에게 유용한 정보가 될 수 있으리라 생각된다.

• 한국토양환경학회지
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• 제2권3호
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• pp.23-30
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• 1997

본 연구의 목적은 슬러리상 생물반응기를 이용한 석유계탄화수소 오염토양의 처리에 있어서 고형물함량 및 혼합강도의 영향을 평가하는 것이다. 디이젤오염토양의 슬러리상 생물학적 처리에 대한 수행결과는 실험실규모에서 얻어졌고 TPH(총 석유계탄화수소)는 생물학적 처리와 연관하여 평가되었다. TPH의 생물학적 및 비생물학적 거동은 디이젤내의 화합물에 의해 이전에 노출되지 않은 토양을 이용하여 결정되었다. 투입량에 대한 반응기부피는 고형물함량을 최대화함으로써 줄여질 수 있다. 고형물함량 50% 및 20%를 적용한 결과 생물학적 TPH 제거율에 있어서 약간의 차이(57.5%:61.6%)를 보여주었다. 혼합과 토양입자의 부유는 오염물의 탈착 및 생물학적 분해에 있어서 매우 중요하다. 이러한 관점에서 본 연구는 두가지 혼합강도를 이용하여 수행되었다. 70rpm을 이용한 반응기의 경우 20rpm을 적용한 반응기에 비하여 토양입자의 부유 및 TPH의 제거율에 있어서 더 좋은 결과를 나타내었다. 20rpm을 적용한 반응기의 경우 토양입자의 완전한 부유가 일어나지 않았다.

• 한국응용과학기술학회지
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• 제19권4호
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• pp.311-319
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• 2002

Environmental friendly acrylic/urea high-solid paint(MUHC) were prepared through the curing reaction of acrylics resin(EBHC) containing 70wt% of solids content and butylated urea curing agent. The synthesis of EBHC Was done at $150^{\circ}C$ for 6 hours, and the results were obtained as follows : $M_{n}=1830{\sim}2190$, $M_{w}$ $3290{\sim}4000$, $M_{w}/M_{n}$=1.80{\sim}1.83$ viscosity=$110{\sim}352$ cps, and conversion=$82{\sim}92$%. After the film was coated with MUHC, the various physical properties were measured. They showed that enhancement of the coating properties such as adhesion, flexibility, abrasion resistance, impact resistance, and water resistance could be expected through introdl1cing caprolactone acrylate component in acrylics resin for the high-solids content acrylics/urea coatings.

• 한국식품저장유통학회지
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• 제8권2호
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• pp.157-163
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• 2001

Optimal conditions for hot water extraction of Liriope spicata tuber were investigated with changes in solvent ratio(2∼6 fold) and heating time(1∼5 hr) by response surface methodology. The content of extractable solids increased with an increased in solvent ratio, and the highest content showed at heating time of 3 hr. The content of total steroid saponin increased with a decrease in solvent ratio, and increased with an increase in heating time at increasing the solvent ratio. The content of non-reducing sugar containing oligosaccharides at a lower solvent ratio didn’t show changes depending on heating time, while that at a higher ration decreased with an increase in heating time. Optimal extraction conditions using hot water as the limited conditions of 15∼18% extractable solids, 1.5∼2.0% total steroid saponin, 6∼8% reducing sugar, 6∼7% non-reducing sugar and 13∼15 brix were 3 hrs of heating time and 4 fold of solvent ratio.

• 한국토양비료학회지
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• 제50권4호
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• pp.215-225
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• 2017

Kiwifruit is prone to damage by frost in the harvest season and the occurrence of postharvest diseases. Accordingly, new cultivars overcoming these disadvantages have been developed. Compared to existing cultivars, studies on diseases in new cultivars are very limited. Thus, goal of this study was investigation of fungal infection occurrences in new cultivars. Kiwifruit was harvested in 2014 and 2015 year, respectively. In both years, cvs. Goldone and Redvita showed more resistance against fungal infection but cv. Gamrok was more sensitive compared with cv. Hayward. Major fungi were identified as Botryosphaeria dothidea, Phomopsis sp., Alternaria alternata and Nigrospora sp. Firmness and soluble solids content were also influenced by the occurrences. This study's findings are important for providing practical information on new cultivars in the kiwifruit industry.

• Preventive Nutrition and Food Science
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• 제12권3호
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• pp.185-189
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• 2007

Quality characteristics of kochujang prepared with strawberry puree (10, 20, and 30% on the total weight basis) were investigated after 30 and 300 days of storage. The moisture content of strawberry kochujang at 300 days was considerably higher than that of strawberry kochujang at 30 days and increasing strawberry content from 0 to 30% significantly increased moisture content of kochujang progressively (p<0.05). Water activity and titratable acidity also showed similar trends, but pH showed the reverse trend with the highest value in control at 30 days and the lowest value in 30% strawberry kochujang at 300 days. As the strawberry puree content increased, amino-nitrogen content consistently and correspondingly decreased. Amino-nitrogen content at 300 days was higher than that of strawberry kochujang at 30 days. Soluble solids content also showed a similar trend, but soluble solid content at 300 days was considerably lower than that of strawberry kochujang at 30 days. Reduction in soluble solids content with increasing strawberry concentration was more evident at 30 days than at 300 day.

• 미생물학회지
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• 제24권4호
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• pp.385-388
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• 1986

고상 발효의 기초적인 애커니즘을 규명하기 위하여 고행화된 배지속에 8앙 효모을 증식시켰마. 이때 실험 배지는 Maxon ] Johnson배지 이었으며, 고형화 물질로는 갈근에서 얻은 전분을 푸깨비로 6-12%를 첨가하였다. 전분이 6-8% 첨가 될때 보 다도 10←12% 첨가될 때 효모의 증식이 8-24시간에서 훨씬 빨랐으며, 단백잘의 분바양도 전분을 10% 첨가 하었을때 10-24시 간에서 가장 높았다.

• 한국식품저장유통학회지
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• 제5권1호
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• pp.1-6
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• 1998

Physicochemical properties of early cultivar of Satsuma mandarin(Citrus unshiu Marc. var. miyagawa) according to harvesting year during 1990 to 1995 were investigated. Climatic conditions of every year affected the quality of citrus fruits. Compared to other harvesting years, flesh ratio and soluble solids were higher, but acid content was lower on citrus fruits produced in 1994, as for good climatic conditions during growth of fruits. Especially, acid content of fruits produced in 1993 was higher, compared to those of years, as for low mean temperature and high rainfalls. Fruit weight, peel thickness and soluble solids had a good linear correlation to fruits size, but acid content and flesh ratio had not correlation derived from difference of individual fruits. From the climatic data, the prediction of fruit quality would be possible in some degree before harvest. It seemed recommend to ably the flexibe method by harvesting year for the quality stanardization of citrus fruit.

• 한국식품저장유통학회지
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• 제5권1호
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• pp.41-47
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• 1998

Physicochemical properties and microbiological quality chanties were investigated on mixed fruit and vegetable juices (apple, carrot and cucumber) stored at 4$^{\circ}C$ without pasteurization(NT), with light piasteurization (LP; 66$^{\circ}C$, 10 sec) and with full pasteurization(FP; 90$^{\circ}C$, 60 sec). Effects of ultrafiltration (UF) on the changes during storage were also examined. pH, viscosity, a-value and b-value remained relatively constant and all samples revealed Newtonian characterisitics. Total acidity and turbidity tended to increase slightly; however, total vitamin C content and L-value slowly decreased during storage up to about 2 months. During the first 4 weeks storage, soluble solids content slowly increased and then decreased. Mold and Yeast and Bacteria were not detected in LP, UP and UF treated samples during storage studied; however, E. coli were detected after 24 days storage. No distinctive storage effects were found among samples prepared; however, ultrafiltration had a considerable effect on the color and soluble solids content of mixed fruit and vegetable juice.

• 상하수도학회지
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• 제19권2호
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• pp.155-160
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• 2005

Gravity thickening process has been widely used in WTP sludge thickening at domestic water treatment plant. The operation method of the process is very simple, however, the process requires long detention time about 24~48 hours for sludge thickening, uses polymer, and low total solids of thickened sludge to increase sludge thickening efficiency. To solve there problems, we studied about flotation process, especially, electro-flotation (EF) process in WTP sludge thickening. Electro-flotation process is simpler than dissolved-air-flotation(DAF) process because EF needs only electrode and current to generate micro-bubbles and the operation is easy. This study was performed at two batch columns to compare interface height, total solids, effluent turbidity between an electro-flotation thickening and a gravity thickening. According to the result, an electro-flotation thickening was that interface height was decreasing, total solids had high concentration, and effluent turbidity was low in comparison with a gravity thickening. Also, it will make the high efficiency of following process, such as a dehydrating process and digestive process. because of high total solids and low moisture content in the sludge.