• 분석과학
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• 제8권2호
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• pp.181-186
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• 1995

저온처리로 자엽과 상배축(hypocotyl)에서 설탕의 농도와 환원당(reducing sugar)의 농도가 약간 증가되었다. 저온처리 동안 총 아미노산의 농도는 계속 증가되었다. 그러나 Asp/Asn, Glu/Gln Thr, Ser, Ala 등에 친수성 아미노산과 양전하를 가진 아미노산인 Lys과 Arg들은 저온처리 동안 계속 변화되었다. 이 변화는 단백질의 합성과 분해에 관계된다. 저온처리로 자엽에서는 24, 52, 55, 56과 73.5kD 단백질이 증가되었고, 줄기에서는 55, 56, 73.5kD 단백질이 증가되었다. 자엽과 줄기에서 유도된 24, 42, 49와 52kD 단백질들은 $100^{\circ}C$에서 끓여도 변성되지 않은 채로 남아 있어서 끓임에 강한 단백질들이다. 이 단백질들이 저온에 대한 저항력을 증가시키는 역할을 한다고 본다.

• 한국식품과학회지
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• 제45권4호
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• pp.466-472
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• 2013

전처리 방법에 따른 냉풍감압건조 복숭아의 이화학적 및 기능적 특성을 조사한 결과 수분함량은 0.3% NaCl 처리에서 유의적인 낮은 수분함량을 나타내었다. pH의 경우 전처리 구에서 낮아지는 경향을 보였고, 당도 및 당산비는 0.1% Vit-C 처리에서 높은 값을 나타내었다. 색도는 전반적으로 건조가 진행될수록 밝기를 나타내는 L 값은 감소하는 경향을 보였으며 색차는 Vit-C>NaCl>Sol-Ca>non-treated 순으로 낮은 값을 나타내었다. 갈변도 또한 색차의 결과와 일치하는 경향을 나타내었다. 총당은 무처리, NaCl, Vit-C 및 Sol-Ca 처리구가 무처리에 비해 높은 함량을 나타내어 향기 및 감미 유지 효과가 있는 것으로 관찰되었고, 유리당은 Vit-C 및 Sol-Ca 처리구에서 fructose, glucose 및 sucrose의 함량이 높은 것으로 나타났다. 절단력은 무처리에 비해 전처리구에서 증가하는 결과를 나타내었으며, Sol-Ca 처리구에서 가장 높은 값을 나타내었다. 관능특성에서는 전처리 구가 무처리에 비하여 외관, 색, 맛, 종합적 기호도가 높아지는 결과를 나타내었으며 특히, Vit-C 처리에서 가장 높은 기호특성을 나타내었다. 전처리방법에 따른 폴리페놀, 플라보노이드 및 프로안토시아니딘 함량에서는 전반적으로 전처리 구에서 높은 함량을 나타내었으며 프로안토시아니딘 함량에서 Vit-C 처리에서 가장 높은 함량을 나타내었다. 항산화능에서는 유용성분 함량이 높을수록 라디칼 소거능이 높아지는 양적 상관관계를 나타내었다.

• 열처리공학회지
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• 제27권1호
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• pp.1-9
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• 2014

For connector material applications, the influence alloying elements of Mn, Cr, Fe, and Ti and cold rolling reduction on the mechanical property, electrical conductivity and bendiability of Cu-Ni-Si-P alloy was investigated. The hot rolled plates were solution treated at $980^{\circ}C$ for 1.5 h, quenched into water, cold rolled by 10% and 30% reduction in thickness, and then aged at $440{\sim}500^{\circ}C$ for 3, 4, 5 times. respectively. Cu-Ni-Si-P-x alloys cold rolled by 10 reduction before heat treatment have a good bendability compare to cold rolled by 30 reduction. Cu-3.4Ni-0.8Si-0.03P-0.1Ti shows the peak strength value of 759 MPa, an electrical conductivity of 39%IACS, an elongation of 10% and a hardness of 256 Hv aged at $440^{\circ}C$ for 6 hrs. Thus it is suitable for lead frame and connector.

• 대한기계학회논문집
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• 제19권3호
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• pp.877-885
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• 1995

Cold forging die for metal scissor is made by electric discharge machine. The impression of female die is made by electric discharge machine, the heat treatment is applied, and the impression is polished. When we forge goods by using this kind of die, the abrasion is severe and the crack occurs after forging about 240 strokes. Because the die should be frequently produced in the case, the cost rises, the work is delayed, and the precesion of goods is not good. Therefore, the electric discharge machine was not used in this study. Main die was produced by making hob, installing the hob to cold hobbing press, indenting the die material, and cold hobbing the impression. The die life was increased to 5,000-6,000 strokes in this case. In the future study, the die life will be increased to 10,000 strokes by changing the following : (1) the pre-treatment of slug, (2) the structure of die block, (3) the heat treatment of die material

• 한국해양공학회지
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• 제22권6호
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• pp.46-51
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• 2008

The effect of the addition of Co and N and subzero treatment on tensile strength and damping capacity was investigated in Fe-Cr-Mn alloy. Austenite was transformed into martensite by cold rollins increasing the degree of cold rollins led to an increase in the volume fraction of martensite. The damping capacity linearly increased with increasing volume fraction of ${\varepsilon}$ martensite in cold rolled specimens and subzero treated specimens after cold rolling. The volume fraction of ${\varepsilon}$ martensite, tensile strength and damping capacity was also increased by the addition of Co, while this treatment decreased the elongation. However, the volume fraction of ${\varepsilon}$ martensite, elongation and damping capacity were reduced by the addition of N, although the tensile strength increased. Tensile strength and damping capacity werealso increased by subzero treatment, while elongation decreased.

• 한국정밀공학회지
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• 제27권5호
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• pp.63-68
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• 2010

The use of aluminum alloy parts in the automotive industry has been increasing recently due to its low weight compared with steel to improve fuel efficiency. Companies in the auto parts' manufacturing sector are expected to meet the government's strict environmental regulations. In this study, manufacturing process of aluminum alloy bolt has been designed from forming to heat treatment. Bolt forming process is composed of cold forging for body and rolling for thread. In this study only cold forging process is considered by employing the finite element method. In the cold forging process, preform shape was designed and damage value was considered for die design. Two steps of forging process has been developed by the simulation and a prototype was manugactured accordingly. As a final process, solution heat treatment and aging process was employed. A final prototype was found to meet the required specifications of tensile strength and dimension.

• 한국산학기술학회논문지
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• 제12권3호
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• pp.1308-1312
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• 2011

CCFL(Cold Cathode Fluorescent Lamp)는 LCD의 BLU와 특수조명용으로 널리 활용되고 있다. CCFL 제조공정에 있어 CCFL 전극 산화막이 형성되어 솔더 불량을 가져오기 때문에 산화 막 제거가 필요하다. 본 논문에서는 CCFL 전극 산화 막 제거를 위하여 플라즈마 처리를 수행하였다. 플라즈마 처리 최적 공정 확보하기위하여 면 저항, XRD, AFM, 솔더링 테스트 등의 분석이 진행되었다. 플라즈마 최적 공정 조건인 사용전력 600W와 처리시간 70초에서 최소의 면 저항과 최대의 솔더 피복 비율이 측정되었다. 이와 같은 현상은 플라즈마 처리로 구리 산화 막 제거에 기인한 것으로 확인되어 플라즈마를 이용한 전극 산화 막 제거 공정은 CCFL 전극 처리 공정에 활용이 기대된다.

• 열처리공학회지
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• 제17권2호
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• pp.101-105
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• 2004

After extrusion, cold rolling and T-6 treatment, texture development of 7x1x Al-alloy with 0.1% Sc is studied. During extrusion the very strong <111>+weak <100> fiber texture is developed, which is Influenced on the formation of rolling texture. The texture after 80% cold rolling can be described by strong{112}<111>(Cu)+{123}<634>(S) component in the cross section of the extruded rod, the strong -fiber+weak{110}<001>(Goss) components in the longitudinal section, and the strong {110}<112>(Bs)+weak{001}<100>(Cube) components in the transverse section. The components of rolling texture are remained after T-6 treatment, but the maximum density of ODF is higher. The calculated mean r-values and the planar anisotropy are relatively high, which are dependent on the texture. After T-6 treatment, recrystallized equiaxed grains with average grain size of $1{\sim}2{\mu}m$ are obtained.

• 대한임상전기생리학회지
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• 제5권2호
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• pp.23-33
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• 2007

Summary of background data: At the wound from life of the human being very regarding at and a healing process the wound in the portion which is important meantime the many research is accomplished and healing process at the wound the research is small very from the physical therapy territory. Purpose: This study was performed to examine the effects of cold therapy and pulsed ultrasound treatment in the process of acute wound healing. To this end, we measured changes in the length of the wounds, and observed tissues through an optical microscope in order to evaluate the healing process of the acute wounds. Methods: We divided twenty Sprague-Dawley rats into four experimental groups of five rats each and treated them for three days after wound creation. Then we extracted tissues from the wounds on day 6th after wound creation and then took them out for hematoxylin-eosin(HE) staining. We measured changes in the length of the wounds every other day. Result: We were able to detect significant statistical differences in the cold therapy and pulsed ultrasound-treated wounds compared with control wounds. We observed tissues through an optical microscope and found the tissues in cold therapy and pulsed ultrasound-treated wounds healed well. Conclusions: Overall results indicated that the use of cold therapy and pulsed ultrasound treatment were effective in the process of acute wound healing.

• 대한한의진단학회지
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• 제18권3호
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• pp.149-174
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• 2014

Objectives to study definition and treatment of dizziness in the books of Cold damage which are classified as symptoms of all time. Methods 1. Quote provisions related to dizziness in "Sanghanlon(傷寒論)" 2. Among the books of Cold damage which are classified as symptoms, select 19 literatures on dizziness with table of contents and collect data and categorize in two perspectives on theories and disease pattern. 3. Compare and draw a chart all data collected in above methods. Results & Conclusions 1. In the books on Cold damage, dizziness is expressed in 2 ways such as head dizziness(頭眩) and fainting(鬱冒). fainting is much more several symptoms than head dizziness and it is the difference that it has mental confusion. 2. The cause of head dizziness after promoting sweating, vomiting and purgation is that source qi(元氣) of upper energizer(上焦) is deficiency, and cause of head dizziness before using method of treatment is wind(風), heat(熱), phlegm(痰), blood deficiency(血虛) and etc. 3. Main cause of fainting is that deficiency is getting severe so that cold invades, and symptoms are blood deficiency, after giving birth and excess pattern of fire and heat. 4. Remedies for head dizziness are using Yeonggyechulgam-tang(苓桂朮甘湯), jinmu-tang(眞武湯), sosiho-tang(小柴胡湯), sagunja-tang(四君子湯), samul-tang(四物湯) and etc. 5. Insamsambaek-tang (人蔘三白湯) and Sayeok-tang(四逆湯) are used for deficiency pattern of fainting, and Dojeok-san(導赤散), Daeseunggi-tang(大承氣湯), and Hwangryeonhaedok-tang(黃連解毒湯) are used for excess pattern(實證).