• Conservation Science in Museum
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• v.14
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• pp.7-12
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• 2013

The conservation has been conducted for the fragments of an wooden boat in the Neolithic Age, excavated from Bibong-ri, Changnyeong, Korea. The vacuum-freeze drying have been applied to mostly to the small relics, such as wooden lacquerwares or small wooden goods etc.. Therefore, the large objects like a wooden boats have been treated almost by air-drying after impregnation with aqueous PEG solution. The air-drying is needed to impregnate with PEG aqueous solution during long period and run the risk of the fault generation. This report explain an example adapted for the fragments of the wooden boat by humidity-controlled drying(HCD) with slow adjusting moisture content. We did the chemical pre-treatment, PEG aqueous solution. The concentration of the aqueous solution was increased gradually from 10% to 80%. After the impregnation, the objects were dried by the HCD. The dimensional stability of the fragments after treatment was good.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2011.06a
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• pp.298-298
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• 2011

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2011.06a
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• pp.299-299
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• 2011

• Journal of Conservation Science
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• v.17 s.17
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• pp.65-72
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• 2005

To preserve straw sandals excavated at Goongnamji site, this study examined the weight change rate by applying the methods of Primal MC-76 and vacuum freeze-drying used mostly as a earth-layer hardening material among PEG and acrylic resin, which are applied widely for preservation of waterlogged archaeological wood, as a means to preserve plant-based cultural properties along with the examination of the subject material. An experiment was also performed on moisture absorption after treatment. The materials of sandals were identified as Typha spp. The weight change experiment revealed that the vacuum freeze-drying after being treated with PEG 2-Step showed the most stabilized changes in weight, while it offered the smallest change in color as well.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.28 no.5
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• pp.208-215
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• 2016

This study was conducted to improve the performance of low-temperature vacuum dryer by applying desiccant to cold trap. Performance evaluation was carried out using several desiccants. The amounts of absorption and diffusivity were measured based on analytic model. Results of desiccant performance evaluation revealed that silica-gel had the most excellent performance for conditions of low-temperature vacuum drying process. Silica-gel was applied to cold trap for evaluating the drying performance. The experiment results showed that the drying time was extended as the thickness of sample was increased due to increased heat and mass transfer resistance of drying sample. In addition, as heating plate temperature was increased, drying time was decreased due to increased evaporation pressure of drying sample. Furthermore, drying time with desiccant was decreased approximately 20% than that without desiccant.

• Conservation Science in Museum
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• v.12
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• pp.47-52
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• 2011

The authors did conservation treatment of wooden objects excavated from Isong Sanung Fortress upon request of the Museum of Hanyang University. The authors investigated types of the trees prior to conservation treatment to find out 1 Pinus spp. and 11 Querus spp. The authors investigated paint coating of 1 wooden ware to find out No.4 of the exterior and No.3 of the interior and about 100㎛ thickness of the lacquer layer. The. conservation treatment was done to immerse wooden ware into high molecular PEG#3,350 in water solution (10 ~ 45%) and to give physical strength and to do vacuum freeze drying.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.324-324
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• 2010

핵융합의 고체형 증식(Helium Cooled Solid Breeder : HCSB) 블랑켓(Blanket Module)은 삼중수소 증식을 위해서 Li4SiO4, Li2TiO3, Li2O 및 Li2ZrO3 등의 페블이 고려되고 있다. 이러한 페블을 제조하기 위해서는 먼저 각각의 분말 제조가 선행되어야 한다. 한국의 Test Blanket Module(TBM)은 Li4SiO4 페블을 개발을 개발하여 사용할 예정이고 옵션으로 Li2TiO3 페블을 개발하는 것으로 되어 있다. Li4SiO4 페블을 개발하기 위해서 먼저 분말합성이 필수적이다. Li4SiO4 분말을 합성에 하기 위해서는 Lithium 금속염과 실리카 졸을 용매 및 폴리머 캐리어로서의 두 가지 기능을 하는 에틸렌글리콜에 첨가한 후 가열하여 완전히 용해시킨 후 혼합 용액을 건조시켜 겔형의 전구체를 제조한다. 이를 하소한 후 결정화시켜 Silicate 분말을 얻는데 이때의 건조, 하소 및 결정화 온도의 조건에 따른 분말의 크기 및 특성이 각각 다르다. 즉, 바인더 물질의 비율과 합성온도에 따라 특성이 약간씩 다른 분말을 얻을 수 있었다. 이렇게 얻어진 Silicate 분말은 지르코니아 볼을 이용하여 약 24 시간 동안 볼 밀링 과정을 통해 입도가 작은 미세한 Silicate 분말로 만들었다. 합성된 분말은 여러 가지 시험 및 분석을 통해서 검증되었으며, 불순물 등은 관찰되지 않았다.

• Conservation Science in Museum
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• v.26
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• pp.13-24
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• 2021

Two wooden fish excavated from Wiryeseong Fortress on Seonggeosan Mountain in Cheonan-si, Chungcheongnam-do Province were frail due to their deterioration within the burial environment. To prevent further deformation, conservation treatment was conducted on them to strengthen the wooden materials and stabilize the dimensions. Prior to the conservation treatment, the species of wood was determined to be pine and infrared Irradiation on the patterns remaining on the wooden fish revealed that they were depictions of carp. For conservation treatment, the wooden fish were impregnated with PEG #3, 350 in a water solution with a 40% concentration, followed by freeze-drying.

• Korean journal of food and cookery science
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• v.23 no.5
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• pp.626-634
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• 2007

This study investigated the effects of 3% ground fresh paprika (FP) and 5% freeze-dried paprika powder (FDP) on lipid oxidation inhibition and warmed-over flavor (WOF) development in cooked ground pork (CGP; meat:fat = 70:30), using two packaging methods (atmosphere packaging and vacuum packaging) during 8 days at $4^{\circ}C$ and 4 months at $-26^{\circ}C$. In the CGP containing FP with atmosphere packaging, at both $4^{\circ}C\;and\;-26^{\circ}C$, peroxide formation increased sharply, and was similar to that of the CGP without paprika. Peroxide formation, in both the CGP without paprika and with FP and packaged with vacuum packaging, repectively, was much lower than that found with atmosphere packaging. Vacuum packaging was superior to atmosphere packaging for lipid oxidation inhibition. In the CGP containing FP with vacuum packaging and stored at $-26^{\circ}C$, peroxide formation almost didn't occur, which was similar to the CGP containing FDP. The peroxide value and thiobarbituric acid (TBA) value did not increase in the CGP containing FDP over the storage periods ($4^{\circ}C\;and\;-26^{\circ}C$) for both the atmosphere and vacuum packaging. Therefore, FDP was the most effective for lipid oxidation inhibition during refrigerated storage, regardless of the packaging method. Both FP and FDP with vacuum packaging during frozen storage showed similar antioxidant activities. The development of WOF in the CGP containing FDP with vacuum packaging was delayed until 7 days at $4^{\circ}C$ and 3 months at $-26^{\circ}C$, respectively. WOF was highly correlated with TBA value in the CGP stored at $-26^{\circ}C$ with vacuum packaging (r = 0.88, p<0.05). The oxidative stability of the lipid in the CGP containing FDP with vacuum packaging was excellent.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.34 no.2
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• pp.137-143
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• 2010

Complete dryness inside the stator is a necessary and sufficient condition for the leak test. Microcracks caused by high cycle fatigue due to operation are generated in stator windings, and they are interrupted by water molecules during the leak test. For this reason, during leak test, the wrong value is indicated when there are no leaks in stator windings. Generator manufacturers presents unique dryness judgment criteria for the leak test, but there is no actual criterion that accurately indicates the dryness point for the leak test. The reason is because stator winding has a complex structure and the absence of effective dryness equipment in power plants. This paper proposes a dryness judgment criterion to evaluate if inside the stator winding is dried completely and presents experimental results.