• 한국도로학회논문집
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• 제19권2호
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• pp.97-102
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• 2017

PURPOSES : Emulsified asphalt is critical for road construction. The objective of applying asphalt emulsion as an adhesive is to prevent the phenomenon of debonding between the upper and lower layers. The quantity and veriety of bituminous material can be varied according to the type of pavement and site conditions. The objective of this study is to reveal the optimum application rates of the emulsified asphalt materials by types of tack-coats using Interface Shear Strength(ISS). METHODS : In the research, emulsified asphalt was paved on the surface of the divided mixture. The specimens of paving asphalt emulsion were utilized to evaluate the bond strength of tack-coat materials. In the evaluation process, NCHRP Report 712 was utilized to investigate the Interface Shear Strength, which reflects the bond capacity of asphalt emulsion. Then, the optimum residual application rates by tack-coat types were determined using regression analysis. RESULTS :As a consequence of squared R values investigated from 0.7 to 1 as part of the regression analysis, the tendency of predicted ISS values was compared with the results. The optimum residual application rates of AP-3, RS(C)-4, QRS-4, and BD-Coat were determined to be $0.78{\ell}/m^2$, $0.51{\ell}/m^2$, $0.53{\ell}/m^2$, and $0.73{\ell}/m^2$, respectively, utilizing 4th regression analysis. CONCLUSIONS :Based on the result of this study, it was not feasible to conclude whether higher residual application of tack-coat material leads to improved bond capacity. Rather, the shearing strength varies depending on the type of pavement.

• 한국방재학회 논문집
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• 제9권1호
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• pp.27-32
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• 2009

본 연구의 주목적은 아스팔트 포장층간의 접착전단강도를 측정하는 실험법과 평가 방법을 개발하고 배수성 포장에 사용되는 택코트 재료의 특성과 적정 살포량을 평가하고자 하였다. 실험에는 두 종류(RSC-4, 개질유화)의 유화아스팔트와 가열 아스팔트바인더 타입(HM-1) 한 종류로 실시하였으며, HM-1은 배수성 포장에 사용하기 위해 새로 개발된 제품이다. 접착전단강도를 측정하기 위해 직접전단실험을 다양한 실험 조건에서 수행하였다. 실험을 통해 얻은 접착전단강도 값은 결과의 변별력이 떨어 졌으며 하중-변위 곡선의 면적인 터프니스가 접착전단강도를 평가하는데 보다 유용한 것을 확인 할 수 있었다. 배수성 포장의 경우 RSC-4의 경우는 $0.8l/m^2$ 이상, 개질유화아스팔트의 경우는 $0.5{\sim}0.6l/m^2$의 살포량이 적당한 것으로 나타났다. Trackless 성능이 우수한 HM-1은 유화 아스팔트 택코트에 비해 월등히 좋은 접착전단성능을 발휘하는 것으로 나타났다.

• 한국식품조리과학회지
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• 제11권3호
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• pp.237-243
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• 1995

"Woomegi Dduck" is one of Korean traditional pan fried rice cake made from glutinous rice by Tack-joo(rice wine) or boiling water. The optimum conditions for the preparation of "Woomegi Dduck" were investigated. The Hardnes, Cohesiveness, Gumminess, Chewiness, Adhesiveness of "Woomegi Dduck" added Tack-joo or boiling water measured by Rheometer, didn′t have significant difference between samples. The result of color test was L-Value, a-Value, b-Value and E Value of Woomegi Dduck added boiling water and 20％ rice flour were high. The best recipe of Woomegi Dduck was glutinous rice flour 50g, rice flour 20g, Tack-joo 30$m\ell$, or boiling water 25$m\ell$, sugar 10g.

• The Korean Journal of Pain
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• 제11권2호
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• pp.343-345
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• 1998

Stellate ganglion block and cervical epidural nerve block are frequently practiced in pain clinics because of simple procedure and good effect. Nerve block at head and neck may produce serious complication such as loss of consciousness and cardiac arrest. Blood supply is rich in neck and inadvertent arterial injection of local anesthetics may enter directly into brain. We experienced convulsion and respiratory arrest during SGB and cervical epidural block. The patients were resuscitated successfully and recovered without any adverse effects.

• 한국인쇄학회지
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• 제10권1호
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• pp.23-33
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• 1992

The negative pressure distribution curves of the exit of printing nip were obtained by the transducer type tackometer. As the results, found that the elasticity of rubber rollers and pastic viscosity affect to the maximum negative and positive pressure but, the gap of the printing nip didn`t affects to the tack values of ink and ink film thickness. Ink spritting is accured by negative pressure and inks viscoelasticity. And the tack value is affect by properties of the vehicle component in the inks.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2012년도 제46차 학술발표회
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• pp.74-74
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• 2012

섬유 프리프레그(Prepreg)는 강화섬유를 수지에 함침하여 B-stage로 만든 복합재료의 중간성형재료이다. 최종적으로 프리프레그를 금형에 적층하여 가열 가압하여 수지를 경화함으로써 최종제품이 완성된다. 본 연구에서는 직물형 프리프레그를 사용하였는데, 사용되는 직물형태로는 복합재료 성형공정에서 형태안정성이 우수한 평직물과 능직물이 주로 사용된다. 직물형 프리프레그를 사용한 복합재료는 작업성과 형태안정성이 우수하면서 내충격특성이 우수하여 오토바이용 헬멧, 방탄용 헬멧 등에 주로 사용된다. 프리프레그에 요구되는 주요 특성중 하나는 Tack성으로서, 성형 과정에서 프리프레그를 여러 장 적층할 때 적층된 층 간에 미끄러지지 않으면서 잘 고정되어 적층 작업을 원활하게 하는 역할을 한다. Tack성은 수지의 B-stage 경화 후의 점성 거동에 따라 변화될 수 있는 것으로 표면의 끈끈함의 정도로서 알 수 있다. Tack성은 온도에 민감하여 측정 시에 일정한 온도의 유지가 중요하다. 이러한 온도에 대한 민감성 때문에 프리프레그의 저장시 저온에서 저장하는 것이 원칙인데, 상온에 있을 경우 시간경과에 따른 Tack성 변화가 크게 나타나게 된다. 따라서 본 연구에서는 아라미드 섬유와 열경화성수지를 이용하여 프리프레그를 제조하고 이를 상온상태에서 보관 시 일정시간 경과에 따른 Tack성 변화를 알아보고자 하였다.

• 접착 및 계면
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• 제6권3호
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• pp.19-25
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• 2005

합성 고무계 점착제는 일반적으로 SIS나 SBS 블록 공중합체와 점착부여수지, 가소제, 기타 첨가제를 함유한다. SIS/SBS 계 점착제는 우수한 접착력에도 불구하고 내용제성이나 내열성이 낮아서 그 사용에 한계가 있다. 이에 이러한 단점을 보완하고자 SIS/SBS 점착제에 가교제, 광개시제를 주성분으로 하는 자외선 경화 시스템을 도입하였다. 제조된 점착제는 thiol-ene 광중합 반응에 의해 가교하였으며 점착제의 프로브 택(probe tack), 박리강도(peel strength) 전단접착파괴온도(shear adhsion failure temperature, SAFT)를 측정하여 UV 경화형 점착특성을 고찰하였다. 또한 UV 경화형 점착제의 택 성질을 프로브 택을 이용하여 프로브 재료별, 점착제의 두께별의 영향을 살펴보았고 접촉각 측정을 통해 점착제 표면 변화를 살펴보았다.

• 미생물학회지
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• 제5권2호
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• pp.43-54
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• 1967

The characteristics of enzymic sources and its effective uses concerned with brewing of Yack-Tack Joo which is traditional and popular liquors for all Korean have been studied. Results obtained are as follows; 1)Kock Ja (enrich of fungi and yeast produced in Korean brewery) is found to be weak in its liquifying(600U.) and saccharifying activity(1300U.), so that it is useful to conbine two factors effectively for better brewing. 2) The additional ratio of Kok Ja per materials is seems proper at line of 20 percent for better fermentation and the enzymic preparations inoculated of microorganisms in wheat bran is seems proper at 25 percent line. 3) Adding the enzymic preperation in which the strain Rhyzopus had been inoculated to the experimental mash at 5 percent per material, the rate of fermentation was revealed highest degree than those of else. 4) It is not proper to add a single Bun Kok in fermentation, as it produce much acid in mash during brewing. 5) However, the enzymic preparation composed of Asp usami and Rhyzopus sp. produced less acid in brewing. 6) The increasing of temparature in enzymic samples, temparatures of the mixtured Kuk(Kok Ja and enzymic preparation) are higher than those of single addition at the first stage in pre-fermentation, but there are no differences at the late stage of post-fermentation. 7) Amount of amino acids in the plot of enzymic prepation are found much more than those of single use at late stage of post-fermentation. In the plot of single use of Kock Ja, the amount was the most than else, the proteinase activity is strongest more than else. 8) In the brewing of Korean Tack-Yack-Joo, it is desirable less amount of acidity, more amount of amino acid, stronger liquifaction of starch and vigorous saccharification. Thren it was found that the application of two prepations(Kock Ja and Bun kok) is most effective to get moderate quality in Tack-Yack-Joo brewing.

• 한국압력기기공학회 논문집
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• 제10권1호
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• pp.7-14
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• 2014

There has been extensive experience associated with the operation of SGs wherein it was believed, based on NDE, that throughwall tube indications were present within the tubesheet. The installation of the SG tubes usually involves the development of a short interference fit, referred to as the tack expansion, at the bottom of the tubesheet. The tack expansion was usually effected by a hard rolling process and thereafter, in most instance, by the expansion of a urethane plug inserted into the tube end and compressed in the axial direction. The rolling process by its very nature is considered to be intensive with regard to metalworking at the inside surface of the tube and would be expected to lead to higher residual surface stresses. Alternate repair criteria(ARC) in the tack expansion area have been developed and applied to nuclear power plants in USA, however domestic nuclear power plants have not applied ARC for tubes in tubeheet area yet. In consideration of the degradation characteristics of tubes in the Steam Generator tubesheet, this paper suggests ARC application for tubes in the steam generator tubesheet of the domestic nuclear power plants in order to assure life time of the steam generator as well as nuclear power plants.

• 공업화학
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• 제18권2호
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• pp.121-125
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• 2007

아크릴계 에멀젼의 내수성 및 촉감을 향상시키기 위해 유연하고 낮은 표면에너지를 가지는 실록산 단량체 및 올리고머와의 공중합체를 제조하였다. 아크릴 작용기를 갖는 실록산 단량체와 올리고머를 합성하고, n-butyl acrylate와 methyl methacrylate를 사용하여 실록산 함유 아크릴 삼원공중합체를 제조하고 표면자유에너지의 변화 및 점착특성을 조사하였다. 삼원공중합체의 Tg는 실록산 단량체의 주입 양이 증가함에 따라 감소하였으나, 올리고머의 경우는 양 말단의 아크릴기에 의해 가교반응이 일어남으로써 삼원 공중합체의 Tg는 증가하였다. 실리콘 단량체와 올리고머를 첨가함에 따라 tack 값과 표면에너지가 감소하는 것으로 내수성 및 촉감이 향상된 것을 확인하였다