• Journal of the Korea Society of Computer and Information
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• 제26권8호
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• pp.181-185
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• 2021

Road fine dust is not simply a problem of air pollution, but is threatening the health and life of the public, including pedestrians using sidewalks. There are various policy proposals related to road fine dust reduction, but the actual effect cannot be guaranteed. Therefore, in order to ensure the safe and pleasant passage of the people, the pavement pavement (sidewalk pavement) for fine dust management on the road should be designed by considering the location, use, function, etc., and appropriate paving materials and construction methods should be selected and designed or sidewalk facilities should be prepared. Therefore, this study examines the concept and legal basis of sidewalk pavement, reviews the status of sidewalk pavement-related technologies that purify air pollution, and utilizes sidewalk pavement materials under the revised sidewalk pavement guidelines for reducing fine dust, 「Act on Promotion of Purchasing of Green Products」 We intend to establish a legal basis for early application of sidewalk pavement technology by proposing measures and amendments to local government sidewalk pavement management rules.

• The monthly packaging world
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• 통권16호
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• pp.126-133
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• 1994

배리어성 종이용기는 지난 1950년대에 개발된 이래 특히 우유용 액체용기로 보편화되면서 용도 확대 및 기술 개발에 있어서 큰 진전을 보여왔다. 이 글에서는 종이용기의 소재$\cdot$구성면에서 독자적인 발전을 이룩해 나가고 있는 미국과 일본의 개발 동향을 살펴본다.

• The monthly packaging world
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• 통권223호
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• pp.86-91
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• 2011

• Proceedings of the Korean Society of Disaster Information Conference
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• 한국재난정보학회 2017년 정기학술대회
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• pp.227-228
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• 2017

본 논문에 사용되는 칩들의 결합을 위해 다양한 접착제(바인더)가 나와 있으나, 환경 친화적인 제품이 많지 않고, 접착력이 떨어지고, 탄성이 작고, 경화시간이 길어서 제품 성능과 작업성에 문제가 많다. 본 Soft 포장재의 경우 하부층과 상부층의 2층 구조를 함으로써 보다 견고하고 내구성이 있는 구조를 가질 수 있으나, 하부층의 경화속도가 늦으면 시공이 길어지게 되기 때문에 경화시간을 단축할 접착제(바인더)의 개발이 절실히 요구된다. 또한 재료의 배합비율을 조절하여 Soft한 정도를 용도에 맞추어 그 배합비의 정도나 표준화된 단면을 적용하여야 한다.

• The monthly packaging world
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• 통권172호
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• pp.61-65
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• 2007

디스플레이용 PET필름 시장이 활황을 띌 것으로 보인다. 디스플레이용 PET필름은 확산.보호.반사 필름, 프리즘시트 등 LCD 광학필름의 원재료 격으로 국내 시장(세계약 40% 추정)은 LCD TV 등의 확산에 힘입어 올해 약 32% 정도의 고성장이 예상되고 있다. 그동안 포장재.비디오테이프∙전자부품 등 범용 PET필름 생산에 주력했던 SKC.코오롱.도레이새한 등 주요 화학.섬유 업체들이 LCD광학필름 제조에 필요한 디스플레이용 PET 필름의 생산 인프라를 확대하거나 새롭게 구축하기 시작한 것이다. 특히 그동안 기존 범용 PET 필름 생산라인의 일부를 이용해 생산했던 방식에서 탈피해 디스플레이 전용 라인을 신설, 향후 지속적인 수요확대에 대응한다는 전략을 구체화하고 있어 주목된다. 본 고에서는 (사)한국포장협회 회원사를 대상으로 조사한 내용을 바탕으로 업체별 PET 및 Nylon 시장을 살펴보도록 하겠다.

• International Journal of Highway Engineering
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• 제9권4호
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• pp.205-213
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• 2007

Strength relationships are presented through experimental data from the concrete strength tests in this study. Various strength tests such as the compressive, flexural, and splitting tensile strength and the modulus of elasticity are included. An experimental work was performed to determine the various strength characteristics for various mix designs. Three different coarse aggregates such as granite, limestone, sandstone were used and included were fine aggregates such as natural sand, washed sand and crushed sand. Also included was cement amount as experimental variable. It was confirmed that each strength value with respect to curing time is to follow a typical strength development curve. With this somewhat reliable test results various strength relationships such as flexural strength-compressive strength, splitting tensile strength-compressive strength, modulus of elasticity-compressive strength, splitting tensile strength-flexural strength were analyzed through statistics. Experimental data were well fitted to the 0.5-power relationship of flexural strength and compressive strength which has been commonly accepted. The splitting tensile strength is expected to be best in the linear relationship from the flexural strength data. Finally splitting tensile strength was found to be proportional to the 0.87 power of the cylindrical compressive strength.

• Journal of the Korean Recycled Construction Resources Institute
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• 제3권3호
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• pp.277-282
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• 2015

This study is conducted to utilize waste concrete powder (WCP) made as a by-product manufacturing high quality recycled aggregate. The blaine fineness of the used waste concrete powder was $928cm^2/g$. As the main characteristic of waste concrete powder, it showed an angular type similar to cement, but hydrated products were attached on the surface of particles. In addition, the size of the particles of waste concrete powder was larger than OPC and in terms of chemical components it had higher $SiO_2$ contents. For using WCP in soil cement-based pavement, the qualities, physical and chemical properties, of WCP should be researched. In the first step, the specified compressive strength of mortar for two types of clay sand soil and clay soil respectively was experimented to be 15 MPa and then optimum mixing ratio of chemical solidification agent were decided in the range of 1.5 - 3.0% in the replacement with cement weight content. In the second step, based on the prior experimental results, recycling possibility of WCP in soil cement-based pavement was studied. In the result of experiment the mixing ratio of WCP were 5, 10, 15 and 20% in the replacement with soil weight and the compressive strength of mortar was somewhat decreased according to the increase of the mixing ratio of WCP.

• Journal of Mushroom
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• 제13권2호
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• pp.119-124
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• 2015

This study was carried out to characterize the chemical components of Flammulina velutipes during storage by different packaging film application for developing export winter mushroom to south east asia area. Changes of weight and growth rate from Flammulina velutipes were the lowest in testing packaging film at $15^{\circ}C$ among the films. The pH changes of Flammulina velutipesg was the highest in imported packaging film at $25^{\circ}C$. The changes of colors was measured by Hunter's color value, L value and yellowness (+b) were slightly decreased during storage. But the L value and yellowness (+b) were not affected by packaging films. Six organic acids were detected such as oxalic acid, lactic acid, malic acid, citric acid, acetic acid and succinic acid. The content of total organic acids were increased by storage period.

• Journal of the Korean Recycled Construction Resources Institute
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• 제5권2호
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• pp.91-96
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• 2010

The purpose of this study is to find problems about pedestrian road of tourist resort and to make new type of sidewalk pavement with wood chip and binder using urethane resin on the parks and tourist resort. The wood chip pavement has new economics and durability with comfortable texture. Samples of these pavement materials were tested for tensile strength, permeability and ball rebound value. Also, after immersion for 24 hours, tensile strength, samples' thickness and weight were measured and discussed the strength reduction according to the water immersion. Tensile strength experimentation was examined on dry condition and water immersion. The result of examination on dry condition was 1.06MPa and on water immersion was 0.67MPa. The results showed 36.8% decreasing rate of tensile strength. Permeability experiment test based on field permeability method of pavement were conducted as a result, permeability coefficients were in the range of 0.67~0.78mm/s that all exceeds object permeability coefficient. Elasticity experiment was based on elasticity test method of Japan road association. GB coefficient was 21% and SB coefficient was 10%. GB coefficient and SB coefficient increased if fine aggregate were increased.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• 제19권2호
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• pp.87-94
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• 2013

To investigate the effects of functional MA films (FMA) masterbatched by zeolite powder treated with 1 N HCl, 0.5 N NaCl solution and anti-fogging agent (NA) compared with control on the freshness extension of 'Fuji' apples during storage at $15^{\circ}C$. Preference, weight loss, total ascorbic acid, sugar content, acidity, change of gas composition in package were measured. After 150 days of storage, the weight loss of control (L) apples was 1%, that of apple in FMA film (NA) was 1.5% after 150 days. Total ascorbic acid content of apples in control (L) after 150 days was 2.09 mg%, those of apple in FMA film (NA) was 2.72 mg%. The titratable acidity of apple in FMA film was higher than that in control, while soluble solids content of apples in FMA film was lower than that in control after 150 days. Ethylene gas adsorbability in control was 192.2 ppm and those in FMA film was 141.4 ppm after 150 days. Overall, apples in FMA film was better than that of control. It was verified that apples packed with LLDPE film (control) lasted about 130days, while those with FMA films lasted about 170 days. Also, FMA films treated with anti-fogging agent few different compare to nontreated film, but commerdity on the display in market was considered higher than that of non-treated anti-fogging agent.