• 열처리공학회지
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• 제26권6호
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• pp.293-299
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• 2013

A specimen of weld metal was prepared by GTA welding with weld wire of super duplex stainless steel. Aging treatment was conducted for the sample at the temperature range of 700 to $900^{\circ}C$ for 5 to 300 minutes. The effect of volume fraction of ${\sigma}$-phase to intergranular corrosion of weld metal has been investigated and the results were derived as follows. The volume fraction of ${\sigma}$ phase tends to increase with an increase of aging temperature and time and intergranular corrosion of weld metal was increased by an increase of ${\sigma}$ phase. Degree of sensitization representing intergranular corrosion was found to tend to increase with an increase of aging time at 700 to $800^{\circ}C$, while it decreased by an increase of aging time at $900^{\circ}C$.

• Journal of Oral Medicine and Pain
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• 제20권2호
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• pp.399-406
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• 1995

The author studied to determine the tooth-age according to the degree of attrition. This study was performed on 247 subjects over forties. Upper and lower posterior teeth were clinically examined and transferred to a store model on which degree of attrition was measured with a magnifier respectively. The obtained results were as follows : The attrition by aging was increased in both male and female. The degree of attrition in male was higher than that in female for same age group. The coefficients of correlation and relation equations by the degree of attrition were obtained.

• 한국경제지리학회지
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• 제17권3호
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• pp.538-553
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• 2014

본 연구는 인구감소 고령화지역에서의 소매판매활동 특성을 고령화 정도와 관련시켜 고찰하는 것을 목적으로 한다. 분석결과 고령화 사회 고령사회는 유사한 주요 소매판매업종을 구성하는데 대해 초 고령사회는 다른 지역과 달리 주요 업종수도 적고, 업종구성도 다르게 나타난다. 이와 같은 특성에서 고령화가 심할수록 사업체당 종사자수와 인구 1인당 연간판매액은 적어지지만 사업체 밀도는 높게 나타나는데, 이는 농산어촌지역에 소매업사업체가 분산 입지하기 때문이고, 고령사회 초 고령사회에서의 노동생산성이 높은 소매구조의 배경은 사업체당 종사자수가 적은데서 기인한 것이다. 인구감소 고령화지역에서 높은 판매액의 구성비를 나타내는 종합소매업, 연료소매업, 음식료품 및 담배소매업에 대해 수급의 정도를 파악한 결과, 먼저 종합소매업은 고령 초 고령사회에서, 연료소매업은 대체로 판매액이 적은 고령 초 고령사회에서, 음식료품 및 담배소매업은 초 고령사회에서 '수급균형지역'으로 나타난다. 그리고 고령화의 정도가 높을수록 수급의 지역 간 격차는 작은데, 이는 지역 간의 구매력의 차이에서 기인한 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.578-580
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• 2004

Substation facilities have become large and complex in the electric power systems. Development of condition monitoring and diagnosis techniques have been very important to improve the security of substation transformers. This paper presents a method to analyze the cause and the degree of aging of power transformers by Self organizing map(SOM). Dissolved gas data were non-linearly transformed by sigmoid function to make determination of SOM close to that of human. Potential of a failure and the degree of aging of a normal transformer are identified by using the proposed quantitative criterion. Furthermore, transformer aging is monitored by the proposed criterion for a set of transformers. To demonstrate the validity of the proposed method, a case study is performed and its results are presented.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 추계학술발표대회 논문집
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• pp.24-28
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• 2002

Composite reinforced fiber materials are used in lots of fields such as a part of aeronautic space, ship, machinery and so on because can make structure wished for necessary condition by control fiber direction and laminated sequence. As the use of advanced composites increase, specific techniques have been developed to repair changed composite structures. In order to repair the damaged part production high quality composite reinforced fiber are completed by control the surrounding temperature and press in autoclave. The quality is influenced heat exposure degree by chemical reaction for precessing. This study considerated influence limit of using by repair structure part and change of properties according to heat exposure degree for repairing.

• 대한한방부인과학회지
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• 제21권1호
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• pp.168-178
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• 2008

Purpose: To verify the relationship of SA2000E results and acupuncture treatment efficacy on postmenopausal women. Methods: Longitudinal analyze relationship of the SA2000E results and hot flush VAS score changes of a clinical trial participants in 2006. Results: Someone who has high Vaso-aging degree by SA2000E represented better hot flash VAS decreasing efficacy. And the diminution rate of hot flash VAS, after 1week from the 1st treatment day was 0.311(p=0.0001), and finally 0.672(p = 0.0396). There are no statistical differences between study group and control group. Conclusion: Clinical trial participant who has better Vaso-physiological function present more hot flash reduce efficacy by acupuncture therapy. Vaso-aging degree by SA2000E could be use as a predictor of acupuncture hot flash treatment result.

• Macromolecular Research
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• 제16권6호
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• pp.561-566
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• 2008

NR composites with different curing systems were aged thermally at 60, 70, 80, and $90^{\circ}C$ for 2-185 days in a convection oven, and the changes in the crosslink density were investigated as a function of the accelerated thermal aging. The overall crosslink densities increased with increasing aging time irrespective of the aging temperatures and curing systems. The changes in crosslink density were enhanced by increasing the aging temperature. The degree of the increased crosslink density was in the following order: "the conventional cure system > the semi-EV system > the EV system". For short term thermal aging, the change in crosslink density with the aging time was complicated, particularly for low temperature aging. The activation energies of the change in crosslink density with thermal aging using the conventional and semi-EV cure systems increased and then remained relatively constant with increasing aging time, whereas that of the specimen with an EV cure system tended to increase linearly. The experimental results were explained by the dissociation of the existing polysulfidic linkages and the formation of new cross links through the crosslinking-related chemicals remaining in the sample.

• 한국식품영양과학회지
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• 제23권5호
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• pp.805-810
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• 1994

Relationship between pungency and allicin content of pickled garlic during aging was examined . Degree of pungency of pickled garlic during aging at 20 $^{\circ}C$ was determined by the sensory evaluation. A panel of 10 members evaluated seven samples of pickled garlic which were aged for 0, 10 , 20, 40 , 50 or 60 days by using scoring test (seven point scale). The sensory evaluation results showed that pungency of pickled garlic decreased gradually during aging, and scored at 3.07 on the 40 th day of aging. Content of allicin, which was a major pungent component of garlic homogenate, was quantitatively analyzed by HPLC. The level of allicin in homogenate of pickled garlic was found to decrease gradually, and to 5.9% on the 40 th day of aging compared with that of fresh garlic. Relationship between the pungency score results and the content of allicin demonstrated a highly positive correlation (r=0.9648).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1948-1950
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• 2000

Polymeric composite insulators have been in use for outdoor insulation. However, our knowledge about their long-term performance in an outdoor environment is still very limited. Especially, these insulators are subjected to the environmental stress such as ultraviolet radiation, electrical stress, mechanical load, etc.. Hence, in this paper, we simulated the factors having influence on aging of polymer insulators using the combined aging test chamber. In order to evaluate an aging characteristics with time, we measured leakage current on these insulators to make out the degree of aging.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.1009-1010
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• 2008

This paper presents a real-time aging measurement and feasible compensation system for the prolonged lifetime of OLED panel. The proposed system is composed of four parts, a PC with a man-machine interface, a measurement block, an adaptive amplifier block, and a compensation block. We apply a tree algorithm for less complexity and convenience of measurement on the degree of aging. An adaptive multi-stage differential amplifier is also implemented to deal with a various range of input voltages at the same spot.