• 한국식품과학회지
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• 제33권2호
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• pp.200-204
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• 2001

'부유' 단감의 MA포장 조건에 따라 $0^{\circ}C$ 저온저장 중 포장내 공기조성 및 과실의 품질 변화를 조사하였다. 처리내용은 포장방법을 1개 열접착, 5개 열접착, 5개 손결속으로 하고, 포장지 두께는 각각 0.03 ㎜, 0.05 ㎜, 0.06 ㎜로 하였다. 조사 결과, 저장 중 포장내 free-volume은 감소하는 경향을 보였다. 특히 열접착 처리구의 free-volume은 처리간 시기적 차이는 있었으나 저장 중 완전히 감소하였다. free-volume의 감소 속도는 포장단위가 크고, 포장지 두께가 얇을수록 빨랐다. 저장중 포장내 산소 농도는 $1.1{\sim}17.1%$, 이산화탄소 농도는 $1.1{\sim}8.3%$ 수준이었고, 저장기간 중 산소 농도는 감소하고, 이산화탄소는 증가하는 경향이었고 포장지가 얇을수록 산소 농도는 높고 이산화탄소 농도는 낮았다. 또한 저장중 이산화탄소 농도가 $4.0{\sim}8.3%$ 수준으로 높게 유지되고, 산소 농도가 $1.1{\sim}4.0%$로 낮게 안정상태로 유지된 0.05 ㎜, 0.06 ㎜ 5개 포장구에서 경도가 높게 유지되었으나, 저장 20주 후 이산화탄소 농도가 8.3%까지 높아진 0.06 ㎜ 5개 열접착 포장구에서 과육갈변과의 발생이 가장 많았다. 반면 산소 농도가 상대적으로 높고 이산화탄소 농도가 비교적 낮은 0.03 ㎜ 포장구와 1개 포장구는 과피흑변과의 발생이 많았다.

• 대한소아치과학회지
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• 제25권4호
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• pp.849-857
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• 1998

The purpose of this study was to investigate whether fluoride-releasing pit and fissure sealant was more effective in preventing caries than conventional non-fluoride-releasing sealant. Specimens 8mm in diameter were made from sound bovine enamel. Fluoride-releasing pit and fissure sealant(Helioseal F, Vivadent, Schaan, Liechtenstein) and non-fluoride-releasing sealant(Helioseal, Vivadent, Schaan, Liechtenstein) were applied to the specimens and artificial caries was induced. Microhardness and the depth of the carious lesion was measured. The following results were obtained: 1. In group 2, sealed with fluoride-releasing sealant, there was a 58.4% decrease in microhardness. This was significantly less than the 84.4% decrease observed in group 1, sealed with non-fluoride-releasing sealant(p<0.01). 2. The average depth of the artificial carious lesion in group 2 was $30.1{\pm}9.8{\mu}m$. In group 1, sealed with non-fluoride-releasing sealant, the lesion was significantly deeper with an average depth of $58.5{\pm}4.9{\mu}m$(p<0.01). 3. Fluoride-releasing pit and fissure sealant was more anticariogenic compared to non-fluoride-releasing sealant.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.693-696
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• 2008

실제 FCM 교량에 적용되는 고강도 콘크리트의 시간의 다양한 양생 환경에서의 시간 의존적 거동을 평가하기 위해, 기건 및 도포, 습윤 환경에서의 100${\times}$100${\times}$400mm 각주형 공시체의 수축량을 측정하였다. 또한 상수와 10% CaCl$_2$ 수용액에 노출된 콘크리트의 3일 및 28일 재령에서의 압축크리프를 측정하였고, 일반적인 기건 및 도포 공시체의 실험 결과와 비교하였다. 도포와 습윤 양생 환경에 노출된 콘크리트의 시간 의존적 거동은 건조수축과 크리프 모두 상당한 차이를 보였다. 따라서 기존의 크리프 실험 방법으로 실제 콘크리트 구조물의 크리프와 건조수축을 측정하는 것에 대한 재고가 필요하다고 판단된다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.373-376
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• 2008

New glass compositions for lead free, low temperature sealing glass frit was examined in $ZnO-V_2O_5-P_2O_5$ glass system which can be used sealing material for PDP to be made of soda lime glass substrates. Among many glass compositions, KFS-C glass showed low glass transition point (Tg) and good fluidity and adhesion characteristics when it was tested by flow button method at low temperature of $420^{\circ}C$. Its Tg was $317^{\circ}C$ and thermal expansion coefficient (CTE) was $70{\times}10^{-7}/K$. The glass frit was mixed with an organic vehicle to make a paste and it was dispensed and sealed with soda lime glass substrates at $420^{\circ}C$ for 10min. Sealed glass panels also showed good adhesion strength even sealed at low temperature of $420^{\circ}C$.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.870-873
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• 2003

We have fabricated a carbon nanotube field emission display(CNT FED) panel with a 2 inch diagonal size by using screen printing method and vacuum in-line sealing technology. The sealing temperature of the panel was around 390 $^{\circ}C$ and the leak test was carried out for 72 hrs after sealing process. When field emission properties of fabricated and sealed CNT FED panel were characterized and compared with those of unsealed panel which was located in vacuum chamber of vacuum level similar with the sealed panel, the sealed panel showed more improved field emission properties.

• 비파괴검사학회지
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• 제26권3호
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• pp.169-173
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• 2006

In-service diagnoses of pipeline facilities are important for a systematic maintenance of them. Field applications by using sealed gamma-ray sources $(^{60}Co,\;^{137}Cs)$ were performed to identify the heterogeneous zone in the pipelines of a distillation tower and a flare stack respectively. From the results, the heterogeneous zones in the pipelines were successfully identified. In the case of the pipeline connected to the distillation tower, a vapor pocket was detected in the fluid under hydrodynamic conditions, which could explain the reason for a decrease of the flow rate. In another case, an area with some amount of catalyst deposits was found at the bottom of the gas pipeline which was connected to the flare stack. And these findings provided important information for the process operators. Diagnosis technique by using gamma radiation sources has been proven to be an effective and reliable method for providing information on a media distribution in a facility.

• 대한기계학회논문집A
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• 제27권8호
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• pp.1371-1379
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• 2003

RP&M (Rapid Prototyping and Manufacturing) is the most appropriate technology for the small-lot production system, because the production cycle is getting shorter owing to various needs of the consumer. In this paper, rapid tooling technology is applied to the casting process. The casting process has the ability to reflect complicated shapes in one process. But it has not been widely used to make a die and mold because of the poor surface quality caused by air bubbles on the surface of the casting product. In this study, the porous casting mold is fabricated from a mixture of plaster and water-soluble binder. The porous casting mold can improve the characteristics of casting products with the help of the vacuum sealed casting process. The vacuum sealed casting process is an advanced technology that removes the air bubbles between the porous casting mould and the liquid metal, thus making the surface of the casting product finer. The purpose of this paper is to develop a high quality shoe mold using porous casting mold and to apply the RP&M technology to the shoe industry.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권12호
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• pp.5616-5642
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• 2016

Different from traditional auctions, electronic auctions provide a platform to allow bidders and auctioneers merchandise to each other over network anytime and anywhere. Auctioneers can publish information of goods, and bidders can choose the interested targets through this bidding platform. To ensure the fairness and security of electronic auctions, Li et al. have proposed a practical electronic auction scheme which can confirm the requirement of strong anonymity, bidding privacy, and secret bidding price. However, we have found out that Li et al.'s scheme may lurk the risk of the denial-of-service attack during the bidding phase in a sealed-bid auction. Thus, we propose a brand-new sealed-bid auction mechanism, in which the essentials of e-auction can be firmly preserved. In particular, each bidder only needs to register at the center once and then can join to multiple plays launched by different auctioneers. Moreover, the correctness of mutual authentication is confirmed according to the BAN logic model.

• Journal of Information Display
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• 제4권3호
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• pp.6-11
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• 2003

We have fabricated a carbon nanotube field emission display (CNT-FED) panel with a 2-inch diagonal size by using a screen printing method and vacuum in-line sealing technology. The sealing temperature of the panel was around 390$^{\circ}C$ and the vacuum level was obtained with 1.4x$10^{-5}$torr at the sealing. When the field emission properties of a fabricated and sealed CNT-FED panel were characterized and compared with those of the unsealed panel which was located in a test chamber of vacuum level similar with the sealed panel. As a result, the sealed panel showed similar I-V characteristics with unsealed one and uniform light emission with very high brightness at a current density of 243 ${\mu}A/cm^2$, obtained at the electric field of 10 V/${\mu}m$.

• Restorative Dentistry and Endodontics
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• 제7권1호
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• pp.41-45
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• 1981

A 19-year-old Korean woman presented with left mandibular dental pain and swelling. Periapical radiolucencies were associated with the mandibular left first molar, second molar and the mandibular right second molar. The mandibular right second molar root developed incompletely and has the open apex. Clinical examination revealed worn accessory occlusal cusps of premolars. A diagnosis of dens evaginatus with associated periapical lesion secondary to pulpal necrosis was made. The root canal of the lower right second premolar was sealed with Calcium hydroxide paste for apexification. About two months later Calcium hydroxide paste was removed and the canal was resealed with new Calcium hydroxide paste. After four months the canal was sealed permanently with guttapercha and zinc oxide-eugenol sealer. The root canals of the lower left premolars were irrigated every week with 3.5% NaOCl solution for and half month. And the canals were sealed with gutta-percha and ZOE sealer. Preventive endodontic treatment for the lower right first premolar was undertaken.