• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.1A
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• pp.1-8
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• 2009

Stay cable is easily exposed to vibration induced rainy wind effects. There are some problems for not only unexpected vibration but also well-known vibration. An outbreak of displacement by the said effects brings damages such as over-tension of cables and barriers, fatigue of anchorages and dampers, and additional shear force variation of stiffening girders. This study suggests analytic methodology for dynamic tension variation of cables and shear force variation of stiffening girders. Additionally this study announces with dynamic problems for cable stayed bridge briefly. To realize this subject, we divide restoring force into chord component and normal component and then make up the differential equations which can satisfy physical phenomenon for each component. Finally we apply adequate functions such as sinusoidal and parabola in order to reduce these differential equations. Therefore we can meet with good results through a series of above process. As a remarkable result, CIP recommendations (2002) give inadequate solution with over 10% error. However it gives very good solution if parts of our study are reflected at the said recommendations. The fact means that CIP recommendations (2002) well-known as international standard of stay cables are not even concern about this subject yet. For verification of this study, F.E. analysis using E.C.C. with external forces was fulfilled, and the accuracy and conciseness of this study were shown.

• Food Science of Animal Resources
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• v.24 no.4
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• pp.319-325
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• 2004

The objective of the present study was to investigate the effect of processing conditions on the physical and sensory properties of pork cutlet produced from chilled pork loin (T1), the cured and massaged chilled pork loin (T2), the cured and massaged frozen pork loin (T3), frozen pork loin (T4), massaged frozen pork loin (T5). Water holding capacity (WHC) of pork cutlets were not significantly different among the treatments. In chilled pork loin, WHC of T2 were slightly higher than that of T1. T4 showed the lowest WHC among all treatment group. In meat color, CIE L$\^$*/, a$\^$*/. b$\^$*/ values in chilled pork loin were not significantly different between T1 and T2. L$\^$*/ values of T3 and T5 were higher than that of T4. a$\^$*/ values were not significantly different among the all treatments. T3 produced through the curing and massaging treatment showed the highest tenderness in shear force (p< 0.001), while force value (kg/㎤) of T4 were the highest among all treatments. Separation ratio of wheat dough from pork cutlet was highest (p.<0.001) in T4. In triangle test, T1 : T3 combination was higher than that of other pairs. No differences in acceptability of sensory evaluation were observed among T1, T2, T3, and T5 groups, while the frozen pork showed the lowest (p<0.001) acceptability. In conclusion, pork cutlets from T4 with the curing and/or massaging process showed similar acceptance than those from chilled pork loins, and this treatments may contribute to promote the consumption of frozen pork loins.

• Journal of Service Research and Studies
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• v.9 no.4
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• pp.63-80
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• 2019

This study presents strategic implications for enhancing the competitiveness of the comprehensive health examination center through the study of its impact on the switching barrier with medical service value and medical service satisfaction as parameters. In order to achieve the purpose of this study, a total of 324 questionnaires were analyzed for customers who received health examinations at the general examination center. Covariance structure analysis was performed to test hypotheses and causal relationships. The results showed that the physical environment had a significant effect on the medical service value and medical service satisfaction. The value of medical service also had a significant effect on medical service satisfaction. The value of medical service was found to affect the transition barrier, but the satisfaction of medical service did not affect the transition barrier. The implications of this study are that physical environment has a significant effect on medical service value and medical service satisfaction. Therefore, modern medical equipment should be equipped with the latest medical equipment to minimize accurate examination and misdiagnosis through modernization of medical examination center. In addition, since the value of medical service has a significant effect on the switching barrier, it is necessary to establish a plan to enhance the value of medical service. We need to promote sustainable customer retention and creation of new customers through differentiated screening items and cost advantages over competitors. In addition to check-up services, efforts should be made to enhance the value of services such as strengthening medical communication and medical complex cultural spaces, and at the same time, establish an organizational culture of customer-first examination centers through the placement of excellent personnel and continuous education.

• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.98-98
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• 2010

그라우팅은 지반의 공학적인 강도증가를 통한 지지력 향상 및 암반의 투수성 저감을 통해 지하수 유동을 억제하기 위하여 대규모 토목공사 현장의 균열암반 및 댐 또는 제방 등의 지역에서 많이 시행되고 있다. 본 연구는 균열암반지역에서 그라우팅 효과 확인을 위하여 보통 포틀랜드 시멘트(OPC)와 마이크로 시멘트(MC)를 사용하여 그라우팅을 수행하였으며, 그라우팅 전후에 물리검층(시추공영상촬영, 초음파 텔레뷰어검층)을 이용하여 그라우팅 효과 정도를 파악하였다. 연구지역은 경상북도 영주시 평은면 지역으로, 지질은 선캠브리아기 안구상편마암에 시대미상의 흑운모 화강암이 관입을 하였고, 이를 제4기의 충적층이 부정합으로 피복되어 있다. 그라우팅은 일반구간과 단층대구간으로 구분하여 실시하였으며, 두 구간의 이격거리는 서로의 간섭을 피하기 위해 약 40m 간격으로 선정하였다. 주입재(OPC, MC)는 5개의 주입공에서 triangle 방향으로 주입하였으며, 주입정도를 확인하기 위하여 각 구간에 2공씩 확인시추를 하였다. 두 개의 site중 일반구간의 보통 포틀랜드시멘트 주입결과 평균주입량은 48.2kg/공이며 주입 1m당으로 환산하면 Lugeon값 10미만의 지층에서는 1.62kg/m이며, 마이크로시멘트의 평균주입량은 49.6kg/공이며 주입 1m당으로 환산하면 Lugeon값 10미만의 지층에서는 3.86kg/m로 나타났다. 단층대 구간에서는 보통 포틀랜드시멘트의 평균주입량이 40.0kg/공이며, 1m당으로 환산하면 Lugeon값 10미만의 지층에서는 2.75kg/m이며, 마이크로 시멘트는 평균주입량이 56.5kg/공, 주입 1m당으로 환산하면 Lugeon값 10미만의 지층에서는 3.15kg/m로 나타났다. 마이크로시멘트의 주입압은 보통 포틀랜드시멘트에 비해 상대적으로 낮았으며, 그라우팅 개선효과 역시 상대적으로 양호한 것으로 나타났다. 그라우팅 효과확인을 위한 물리검층의 초음파텔레뷰어 해석결과 상대암반강도는 주입전 $250{\sim}750\;kgf/cm^2$, 주입후는 $400{\sim}800\;kgf/cm^2$으로 그라우팅에 의한 암반강도의 상승을 확인할 수 있었고, 시추공영상촬영 분석에서는 시추코어만으로 얻기 힘든 시멘트 충진구간을 직접 확인할 수 있었다. 초음파텔레뷰어의 경우 파쇄대의 분포 및 암반강도 측정을 통한 그라우팅 파악은 가능하였으나 파쇄대 충진물을 확인할 수가 없는 단점이 있었고 이를 시추공영상촬영을 통해 보완할 수 있었다. 다만 물리검층의 경우 그라우팅에 의한 공의 손실로 동일공에 의한 반복 조사가 아닌 경우가 대부분이어서 그라우팅 효과에 대한 정확한 비교가 어려웠으며 추후 이를 보완하기 위한 계속적인 연구가 필요할 것으로 사료된다.

• Journal of Food Hygiene and Safety
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• v.34 no.1
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• pp.106-114
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• 2019

The effect of physical and chemical treatments to reduce staphylococcal phages was investigated. To determine impact of physical treatment on viability of phages, two staphylococcal phages (SAP84 and SAP89) were treated with multiple heat ($55^{\circ}C$ and $60^{\circ}C$) and pH (pH4, 7, 10) conditions. Viability of SAP 84 was dramatically reduced at 60C and SAP 89 was completely inactivated at 60C within 25 min. Overall, the two phages were stable under all the pH conditions tested except for the SAP 89 at pH 10. Treatments, a 10% FAS (Ferrous Ammonium Sulfate) solution and various density of ethanol and sodium hypochlorite were used to reduce the two phages. SAP 84 was unstable in 50% and 70% ethanol. However, SAP 84 and SAP 89 showed high tolerance after exposure to 100 ppm of sodium hypochlorite which is known as an effective sterilizer. As soon as the two phages were treated with 10% FAS, which is used as a virucidal agent, they were inactivated and did not form any plaque. The result of this study provides additional evidence that staphylococcal phages can be controlled by various physicochemical treatments.

• Journal of Service Research and Studies
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• v.8 no.3
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• pp.63-80
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• 2018

This study empirically analyzed impacts of interaction quality and physical environmental quality on university recommendation intention of Chinese international students in Korea. In addition this study analyzed a direct impact of familiarity toward Korea on university recommendation intention, and a moderating impact of familiarity toward Korea on the relationship among interaction quality, physical environmental quality, and university recommendation intentions of Chinese international students in Korea. For empirical analysis, this study collected 204 questionnaires in final from Chinese international students currently living in the KyungBuk province. The analysis result was that all three antecedents interaction quality, physical environmental quality, and familiarity toward Korea positively affect university recommendation intention. And the familiarity to Korea positively moderated the relationship between physical environmental quality and university recommendation intentions. Finally, this study suggested academic and practical implications.

• Food Engineering Progress
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• v.22 no.4
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• pp.344-352
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• 2018

The effects of chemical compositions (protein, lipid, and dietary fiber) on the physical properties of dried biji powders were investigated. The raw biji was freeze-dried (control) and hot-air dried (untreated). The untreated biji was further defatted and deproteinated. The prepared biji powders were analyzed for the proximate composition, total dietary fiber (TDF), water absorption index (WAI), water solubility index (WSI), swelling power, solubility (including the quantification of soluble carbohydrate and protein fractions), and final viscosity (using a rapid visco analyzer). Control and untreated biji powders exhibited the similar chemical compositions. The defatted biji possessed higher TDF, although its protein content did not significantly differ for control and untreated ones. The deproteinated biji consisted mainly of TDF. WAI and swelling power increased in the order: deproteinated > defatted > control > untreated biji powders. WSI and solubility increased in the order: control > untreated > defatted > deproteinated biji powders. The similar patterns were observed for soluble carbohydrate and protein fractions. The deproteinated biji revealed the highest viscosity over applied temperatures, while the untreated one was lowest. Overall results suggested that the physical properties of the dried biji powder were reduced by protein and fat, but enhanced by dietary fiber.

• Journal of KIISE:Computer Systems and Theory
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• v.29 no.8
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• pp.472-483
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• 2002

This paper presents the design and implementation of a cache file system, umcFS, which is specifically designed to provide an efficient caching and transmission of streaming media. The proposed file system is based on the concept of file disk and implemented as an application level on top of a general-purpose file system. The file disk favors the continuity of cached media and provides an efficient I/O mechanism for cache server. umcFS statically allocates control blocks as well as media cache blocks. These blocks are referenced by the single-level indirect management structure. As the file system is designed as an application level, it is easy to develop and port to other systems. The performance of the implemented system shows that umcFS performs about 13% better than the native file system in randomly accessing the cache blocks of 1024KB.

• Korean Journal of Food Science and Technology
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• v.29 no.2
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• pp.255-260
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• 1997

Glucomannan was isolated from konjac (Amorphophallus konjac) flour by precipitating in aqueous alcohol solution. Konjac glucomannan films were prepared at various concentrations up to 1.0% (w/v) in aqueous glycerol solutions. Tensile strength (TS), percent elongation (E), water vapor permeability (WVP) as the barrier property and the solubility of the films were varied with glucomannan concentrations, glycerol contents and storage humidities. TS was decreased as the glucomannan concentration in the film and relative humidity for storage increased, and E was vice versa. WVP showed better barrier properties compared with other polysaccharides films. Glycerol contents in the film significantly affccted TS and E, but did not affect WVP. The glucomannan films were completely dissolved in the water by 150 min stirring at room temperature.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.1
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• pp.35-43
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• 2002

In the last decade, considerable efforts have been made to make a new class of solid state high power, high speed electronic device, namely, the Photo-Conductive Power Switch(PCPS), and to characterize the high-field performance of PCPS under high power, high voltage conditions. But the problem of surface flashover phenomena persist, preventing the realization of reliable and efficient high-speed, high voltage switching devices. It is essential to have a clear understanding on the physical processes behind the surface flashover problem to develop new technologies and device architectures so as to fabricate PCPS that are capable of high-field high-voltage. Also, it is imperative to identify new materials that could satisfy the requirements for high-field, high-power devices. Since surface flashover, surface breakdown phenomena is observed for all the devices that foiled at the applied field much lower than semiconductor bulk breakdown field, surface passivation is considered one of the important practical methods to improve the high field performance of the devices. Therefore, this paper was studied the main properties and mechanism of the semiconductor surface flashover before and after passivation under high electric-field.