알로에 추출물이 모발보호에 미치는 영향

이영조,장창곡 중소기업융합학회 2019 융합정보논문지 Vol.9 No.11

To protect healthy and beautiful hair, the hair protection effect was tested by adding an aloe extract from the hair solution. The treatment groups were grouped into four categories: Group II (Famma Treatment Only), Group III (Oxidase+aloe), Group IV (Reduce+aloe), and Group V (Oxidase+aloe, Release+aloe). The test hair is collected from women's hair in their 20s, 30s and 40s who have not undergone chemical treatment such as permanent and dying for one year and use 100% aloe stock solution. In order to evaluate hair thickness, cuticles, tensile strength, elongation and formation rate, the experiment environment was 28.9 degrees and 72% humidity. All statistical tests were done at 5% significant level. Cuticle, elongation, and formation rate were significantly improved (P<.05) and cuticle was best in group Ⅴ, elongation was group Ⅲ. In conclusion, aloe added to perm treatment were effective in improving cuticle, elongation rate, and formation of hair. 건강하고 아름다운 모발을 보호하기 위해 펌 제에 알로에 추출물을 첨가해 모발보호 효과를 알아보고자 한다. 처치 군은 그룹 II(파마 약만 사용한 그룹), 그룹 III(알로에 추출물을 1제에만 첨가), 그룹 IV(알로에 추출물을 2제에만 첨가), 그룹 V(알로에 추출물을 1제와 2제에 첨가)로 나누어 진다. 실험 모발은 1년간 영구 염색 등 화학치료를 받지 않은 20대, 30대, 40대 여성의 모발에서 채취해 100% 알로에 추출용액을 사용한다. 머리카락 굵기와 큐티클, 인장강도, 신장 및 연신율을 측정하기 위해 실험 환경은 28.9도, 습도는 72%로 유지했다. 모든 통계 시험은 5% 유의수준에서 수행되었다. 큐티클, 연신율, 형성률이 현저히 향상되었고(P<.05) 큐티클은 그룹 V에서, 연신율은 그룹 Ⅲ에서 가장 좋았다. 결론적으로 파마 치료에 첨가된 알로에는 큐티클, 신장률, 모발 형성에 효과적이었다.

건축용 실링재의 바탕면 변위에 따른 연신율과 부착강도

차연주,이수용 대한건축학회지회연합회 2005 대한건축학회지회연합회 학술발표대회논문집 Vol.1 No.1

Sealants cause problem that exfoliation with surface and breaking of sealants by a change of temperature, humidity and wind pressure according as time passes. In this study, it was intended to provide solution for choose a sealant which satisfy the requirement on the joint when sealing construction. For this purpose, after producing experimental specimens, tests were performed to analyze the elongation and adhesive strength according to the kind of sealants and surface. The result of this study, the elongation, adhesive strength and modulus of elasticity show wide difference depending on the kind of sealant without related surface material. Therefore, sealing construction need appropriate use according to sealant type.

원형강관 제작시 발생하는 변형을 경험한 강판의 구조적 성능분석

오재열,이세정,정진안,박대곤,양일승 한국복합신소재구조학회 2019 복합신소재구조학회논문집 Vol.10 No.6

For structural steel, experiencing a large deformation above yield strain results in changes in structural performance such as yield strength, extreme strength and ductility. Since these in material properties occur during the fabrication process of the circular tube, it is necessary to identify the effects of deformation on the structural performance. Therefore, in this study, a number of tensile experiments were conducted by collecting test pieces in the direction of longitudinal and transverse of steel tube with parameter of the diameter and the thickness of the circular steel tube. Based on the results of the experiment, it was found that the test piece taken from the circular steel plate had greater yield strength and tensile strength compared to the test piece taken from the coil, and the elongation rate decreased. 일반적인 구조용 강재의 경우 항복변형률의 이상의 변형을 경험한 이후에 하중을 제거하면 재가력되는 시점에 따라서 재료의 항복강도는 증가하고 연성이 감소하는 현상을 보인다. 원형강관의 경우 철판을 말아서 제작하는 과정에서 철판의 두께와 원형강관의 직경에 따라서 항복변형률이상의 큰 변형을 경험하게 되고 이러한 변형은 제작된 강관의 구조적인 성능에 많은 영향을 미친다. 이러한 이유에서 제작과정에 발생하는 변형이 원형강관의 구조성능에 미치는 영향을 파악할 필요가 있다. 따라서, 이 연구에서는 원형강관을 제작하는 경우에 발생하는 변형에 의한 철판의 항복강도, 인장강도 및 연성 등의 영향을 파악하기 위해서 강관의 직경 및 두께와 시험편을 채취한 방향을 변수로 다수의 인장실험을 수행하고 이를 분석하였다. 실험 결과를 바탕으로 원형강판에서 채취한 시험편은 코일에서 채취한 시험편에 비해 항복강도와 인장강도가 더 높았고, 연신율은 낮아진 것으로 나타났다.

드라이빙핀이 사용된 강재의 기계적 특성

김원일(Kim Won-Il),정용훈(Jung Yong-Hoon),황성철(Hwang Sung-Chul),양일승(Yang Il-Seung),김순철(Kim Soon-Chul) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)

Metallurgical connection methods, such as stud weld and puddle weld, have been used for a long time to attach a steel beam and a steel deck. Recently, the mechanical connection method has been used as an alternative to the metallurgical connection method. This method uses the explosive power of gunpowder to instantaneously drive a pin to combine a steel deck and a steel beam. This mechanical connection method has many advantages over metallurgical connection methods. First of all, a power supply is unnecessary and there are no concerns about an electrical accident. However, the handling of the mechanical connection method takes severs caution. Since the sound at the time of installation is loud, discretion is needed in a quiet place. Above all, when a pin is installed in a steel beam, the cross-section of the steel beam is reduced. Therefore, the effect of the pin on the tensile properties of the steel beam is the focus of this research. The main parameters are steel plate thickness, notch thickness, steel type, and damage types, that is, non-damage, drilled hole, and driving pin. This research supplies the fundamental data to the design criterion of this mechanical method by clarifying the influence of the mechanical method on the tensile property of the structural steel member. In a results, the strength and stiffness specimens using driving pin was raised but decreased deformation capacities and elongation.

방호 ∙ 방폭 보강용 복합섬유 패널 제작을 위한 기초연구

Woonhak Kim,Seokwon Kang,Seunggyu Yun 한국재난정보학회 2015 한국재난정보학회 논문집 Vol.11 No.2

콘크리트 구조물의 방호․방폭성능을 향상시키기 위한 보강방법으로 배면보강이나 콘크리트 재료의 물성보강에 따른 방법과, 구조 부재나 지지물 등을 추가로 설치하여 저항성능을 향상 시키는 방법 등을 고려하였을 때 경제적인 측면과 구조적인 측면에서 효율성이 떨어진다. 본 논문에서는 패널의 각 단층 구성 재료에 고인장, 경량화, 부착성능, 내화성능 등을 향상시켜 단층 각각의 개별적인 특수 성능과 복합패널 구성물로서의 방호방폭 성능을 극대화 할 수 있는 섬유복합패널 외피와 충전제로서 나노복합소재 및 접착제에 대한 기초 연구를 수행하였다. 그 결과 섬유복합패널 외피(아라미드-폴리에스터 비 6:4, 6.5:3.5)의 최대 인장강도 2,348MPa, 최대 신율 1.8%의 값을 얻었고, 나노복합소재와 접착제를 혼합한 충전제의 최대 인장전단접착강도 4MPa을 얻었다. 또한 나노복합소재로 제작한 충전제는 보통포틀랜드시 멘트의 30%의 경량화의 결과를 얻었다. The methods to improve the protection and explosion-proof performance of concrete structures include the backside reinforcement or concrete material property improvement and the addition of structural members or supports to increase the resistance performance, but they are inefficient in terms of economics and structural characteristics. This study is about the basic study on the fiber composite panel cover, and the nano-composite material and adhesive as the filler, to maximize the specific performance of each layer and the protection and explosion-proof performance as the composite panel component by improving the tensile strength, light weight, adhesion and fire-proof performances. The fiber composite panel cover (aramid-polyester ratios of 6:4 and 6.5:3.5) had a 2,348 MPa maximum tensile strength and a 1.8% maximum elongation. The filler that contained the nano-composite material and adhesive had a 4 MPa maximum tensile shear adhesive strength. In addition, the nano-composite filler was 30% lighter than the normal portland cement

중변형률 속도에서의 강판의 파단 연신율 연구

임지호(Jiho Lim),김석봉(Seokbong Kim),김진성(Jinsung Kim),허훈(Hoon Huh),권순용(Sunyong Kwon),윤치상(Chisang Yoon),박성호(Sungho Park) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

While the formability is important and indispensable for success in very complicated sheet metal forming, it seems that few studies has been carried out about the formability of sheet metal at the high strain rate. The present experimental results report that the elongation is dependent on the crosshead speed in tensile tests. In this paper, the tensile elongation has been obtained from various steel sheets for an auto-body at the intermediate strain rate. The strain rate in the experiment is ranged from 0.003/sec to 200/sec. The experimental result demonstrates that the tensile elongation does not decrease as the strain rate increases. This tendency has varieties depending on the microstructure and forming history of sheet metal. Some high strength steels have the tendency that the tensile elongation increases as the strain rate increases, while others not. This phenomenon is very important not only in sheet metal forming but also in the crash worthiness evaluation to predict the fracture and tearing of sheet metal members.

Al6056 볼트의 강도 향상을 위한 실험적 연구

김승우(Seung-Woo Kim),왕촨핑(Chuan-Ping Wang),박재일(Jae-il Park),박정섭(Jung-Sub Park),강종훈(Jong-Hun Kang) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.5

This study investigated the improvement in strength and elongation through the T6 heat treatment of an aluminum 6056 alloy. The tensile strength and elongation results were measured by conducting two tensile tests per condition for 72 T6 heat treatment conditions, and Minitab analysis was used to analyze the influence of changes in tensile strength and elongation due to the T6 heat treatment conditions. The tensile strength was affected by the solution temperature, solution time, aging temperature, and aging time, whereas elongation was affected by the aging temperature and aging time. To derive a condition that satisfies the improvement of strength and elongation simultaneously, we used Minitab analysis to analyze the variables of solution temperature, solution time, aging temperature, and aging time, and a tensile strength of 400 MPa and an elongation of 20% were identified. Scanning electron microscopy and energy dispersive spectroscopy analyses confirmed the distribution of light-colored precipitates, and it is unlikely that the differences in the precipitates due to strength variation can be identified using differences in the specimen location.

시험온도와 열처리 변화가 핵연료 봉의 파열강도에 미치는 영향

김경호(Kyeong Ho Kim),이민구(Min Ku Lee),이창규(Chang Kyu Rhee),위명용(Myeong Yong Wey),김흥회(Whung Whoe Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8

The burst tests of low tin Zircaloy-4 claddings were conducted in order to obtain high temperature deformation behavior and burst strength characteristics with heat treatment condition and testing temperature, which varying room temperature to 50℃. While the uniform burst elongation and total circumferential elongation value of stress-relieved tube is small, the ultimate hoop stress of that tube are larger than that of fully recrystallized tube at all test temperature. The inflection point of elongation was 3000℃ for stress relived tubes and maximum elongation point was 4000℃ for fully recrystallized tube. The burst mechanism was believed that, after deformation was uniformly exerted on circumferentially until maximum circumferential stress reached, pin-hole fractured caused the fracture by the local stress concentration, which results from the decreasing tube thickness.

Ni-Co 합금강의 탄소함량에 따른 기계적 특성에 관한 연구

최병기,정장만,최병희 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1

This study was to evaluate the effect of carbon content on metallic change and fatigue characteristics with Fe-29%Ni-17%Co, low heat expansion alloy, widely using electronic components, precision machines, and sealing with glass and metal etc. The steels were fabricated with variation of carbon content, 0, 0.03, 0.06, 0.1, and 0.20% with VIM and tensile test and fatigue test were performed to achieve the above purpose. The more carbon content, the higher hardness value and yield strength. But elongation of 0.03%C, 0.06%C. and 0.10%C specimen decreased about 2.2%, 1.5% and 0.8% respectively more than that of the base metal. Especially the strength and elongation of 0.20%C specimen increased simultaneously about 14.4% and 7.5%. Fatigue life of 0.03%C specimen decreased but the more carbon content, the higher fatigue life over 0.06% carbon content more than that of base metal.

SABC1470 자동차 판의 기계적 성질과 합금층에 미치는 핫 스탬핑 공정의 영향

허광(Kwang-Heo) 산업기술교육훈련학회 2020 산업기술연구논문지 (JITR) Vol.25 No.1

This study was conducted to obtain the necessary data to develop the optimal manufacturing process for the PHS products using a hot-stamping technique which utilizes an SABC 1470 steel plate alloyed with 5~11% Si-Al. The hardness and tensile property requirements were mostly satisfied with high temperature and long-term heat treatment. The elongation rate and alloyed layer were satisfied under all the conditions tested. Under various conditions, the micro-organization of the hot-stamped steel plates consisted of a small amount of ferrite and martensite over time, and in some cases a very small amount of pearlite was present. All the properties were dependent on the microstructure of the steel plate. As the amount of ferrite increased, the elongation rate increased and the hardness and the intensity decreased. If the required hardness and intensity were not met, the ferrite existed with the martensite. The ferrite significantly influenced the tensile strength and elongation rate; however, its impact on hardness was insignificant. The greater the thickness, the higher the temperature and the longer the time required. Some cracks were created in the alloyed layer under the above-mentioned working conditions. The increase in the heating temperature and the longer heating time increased the thickness of the alloyed layer. This increased thickness has a significant effect on time rather than the heating temperature.