• 동아시아식생활학회지
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• 제16권4호
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• pp.481-487
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• 2006

Coupons that restaurants are competitively issuing have considerable effects on company profits, depending on the performance of redemption rate. The purpose of the study is to identify the coupon type that consumers most prefer, among coupon types the most frequently issued restaurants, and to investigate consumers' coupon redemption rate and revisit intention based on brand familiarity. In this study, freshmen and sophomores in the 2-year colleges and the universities located in Seoul and Kyoungi province were sampled by convenience sampling, and surveyed about 3 coupon types (free meal coupon, discount rate coupon, discount price coupon) with 150 copies of questionnaire for each type, totally 450 copies randomly distributed. As a result, relationship between coupon redemption intention and revisit intention based on brand familiarity was that, the higher brand familiarity was, the higher coupon redemption intention and revisit intention were, regardless of coupon types. This study lies in that it approached to discount method, one of the coupon types, by further subdividing into discount rate and discount price, and that redemption intention and revisit intention were studied by taking account of coupon familiarity.

• 한국경영과학회지
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• 제36권4호
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• pp.17-27
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• 2011

The coupon issued by Korail (Korail's coupon) is characterized by the properties such as a discount rate, an issuing region, a selling region, and a practically discounted rate. The purpose of this study is to investigate their impacts on the redemption time using Log-Normal distribution, and to derive managerial implications for improving Korail's discount program. The result showed that the redemption time was shorter or longer depending a discount rate, an issuing region, a selling region, and a practically discounted rate.

• Corrosion Science and Technology
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• 제4권1호
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• pp.1-7
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• 2005

An alternating current (AC) corrosion on buried pipeline has been studied using coupon and ER probe. Coupons and ER probes were applied to the sites from high value of AC voltage to low value based on the survey of AC voltages on buried gas transmission pipeline over the country. Parameters such as AC current density of coupon, AC voltage, cathodic protection potential, soil resistivity and frequency were monitored continually. Corrosion induced by AC was observed even under cathodically protected condition that met cathodic protection criterion (; below -850 mV vs. CSE). Corrosion rate was affected mainly not by AC voltage but by both of frequency and AC current density. An experimental corrosion rate relation could be obtained according to effective AC current density, in which AC corrosion rate increased linearly with effective AC current density, and its slope was 0.619 in coupon method and 0.885 in ER probes.

• Communications for Statistical Applications and Methods
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• 제29권1호
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• pp.85-101
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• 2022

Derivative-linked securities (DLS) is a type of derivatives that offer an agreed return when the underlying asset price moves within a specified range by the maturity date. The underlying assets of DLS are diverse such as interest rates, exchange rates, crude oil, or gold. A German 10-year bond rate-linked DLS and a USD-GBP CMS rate-linked DLS have recently become a social issue in Korea due to a huge loss to investors. In this regard, this paper accounts for the payoff structure of these products and evaluates their prices and fair coupon rates as well as risk measures such as Value-at-Risk (VaR) and Tail-Value-at-Risk (TVaR). We would like to examine how risky these products were and whether or not their coupon rates were appropriate. We use Hull-White Model as the stochastic model for the underlying assets and Monte Carlo (MC) methods to obtain numerical results. The no-arbitrage prices of the German 10-year bond rate-linked DLS and the USD-GBP CMS rate-linked DLS at the center of the social issue turned out to be 0.9662% and 0.9355% of the original investment, respectively. Considering that Korea government bond rate for 2018 is about 2%, these values are quite low. The fair coupon rates that make the prices of DLS equal to the original investment are computed as 4.76% for the German 10-year bond rate-linked DLS and 7% for the USD-GBP CMS rate-linked DLS. Their actual coupon rates were 1.4% and 3.5%. The 95% VaR and TVaR of the loss for German 10-year bond rate-linked DLS are 37.30% and 64.45%, and those of the loss for USD-GBP CMS rate-linked DLS are 73.98% and 87.43% of the initial investment. Summing up the numerical results obtained, we could see that the DLS products of our interest were indeed quite unfavorable to individual investors.

• 반도체디스플레이기술학회지
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• 제5권2호
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• pp.33-36
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• 2006

Many issues arose to use the Pb-free solder as adhesive materials in MEMS ICs and packaging. Then this study for easy and simple sealing method using adhesive materials was carried out to maintain hermetic characteristic in MEMS Package. In this study, Hermetic characteristic using negative PR (XP SU-8 3050 NO-2) as adhesive at the interface of Si test coupon/glass substrate and Si test coupon/LTCC substrate was examined. For experiment, the dispenser pressure was 4 MPa and the $200\;{\mu}m{\Phi}$ syringe nozzle was used. 3.0 mm/sec as speed of dispensing and 0.13 mm as the gap between Si test coupon and nozzle was selected to machine condition. 1 min at $65^{\circ}C$ and 15 min at $95^{\circ}C$ as Soft bake, $200\;mj/cm^2$ expose in 365 nm wavelength as UV expose, 1 min at $65^{\circ}C$ and 6 min at $95^{\circ}C$ as Post expose bake, 60 min at $150^{\circ}C$ as hard bake were selected to activation condition of negative PR. Hermetic sealing was achieved at the Si test coupon/ glass substrate and Si test coupon/LTCC substrate. The leak rate of Si test coupon/glass substrate was $5.9{\times}10^{-8}mbar-l/sec$, and there was no effect by adhesive method. The leak rate of Si test coupon/LTCC substrate was $4.9{\times}10^{-8}mbar-l/sec$, and there was no effect by dispensing cycle. Better leak rate value could be achieved to use modified substrate which prevent PR flow, to increase UV expose energy and to use system that controls gap automatically with vision.

• 한국가스학회지
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• 제5권3호
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• pp.63-72
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• 2001

천연가스 공급용 고압 지하 매설배관에 교류가 유도될 때 쿠폰과 전기저항형 박막센서를 이용하여 교류에 의한 부식속도를 평가하고 주요한 인자를 규명하고자 하였다. 전국에 걸쳐 조사된 교류전압 측정결과를 바탕으로 쿠폰과 전기저항형 박막센서를 설치하고, 주요인자를 고찰하기 위하여 다양한 인자들 (교류전압, 교류전류, 토양 비저항, 주파수, 방식전위)을 정기적으로 기록하였다. 황산동 전극기준 -850mV의 방식전위를 충분히 만족하는 상황에서도 교류에 의한 부식이 진행하였으며, 교류에 의한 부식속도는 교류전압과는 관계없이 교류전류밀도와 주파수에 의존하는 것으로 나타났다. 교류에 의한 부식속도는 유효교류전류밀도에 따라 직선적으로 증가하였으며, 쿠폰에 의한 평가결과 직선의 기울기는 0.619, 전기저항형 센서에 의한 직선의 기울기는 0.885로 나타났다.

• 대한가정학회지
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• 제46권10호
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• pp.107-117
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• 2008

The purpose of this study was to analyze customer attraction effects of restaurant promotion for kids. The questionnaires were distributed to 300 parents who have children under 12 years old and a total of 269 questionnaires were collected and used in analysis(usage rate 90.0%). The data was analyzed using SPSS 12.0 for descriptive analysis and paired t-test. The major results were as follows; First, customers mainly got information on coupon from mail. In case of premium and membership, the information was obtained when customers were visiting restaurants. Second, among the types of promotion for kids, coupon was mostly preferred by customers. 'Discount coupon' for the coupon, 'free gift' for the premium and 'pay-back' program for the membership were more preferable than other types of kids promotion. Third, A 'discount coupon' was more effective than 'free coupon'(p<.0l) in term of customer inducement. In case of premium, 'free gift' was more effective than 'lottery'(p<.05) and in case of membership, the customer attraction effect was not significantly different according to the types of membership. In case of coupon and membership, it was more effective in family restaurant than fastfood restaurant(p<.05), but the effect of premium was not significantly different in family vs fastfood restaurant. The results of the study revealed that 'coupon' was the most preferred type of promotion for kids and specifically customers preferred 'discount coupon', 'free gift' and 'pay-back program'.

• Journal of Microbiology and Biotechnology
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• 제13권6호
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• pp.937-941
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• 2003

Microbiologically influenced corrosion (MIC) is an electrochemical process where the participation of microorganisms initiates, facilitates, or accelerates the corrosion reaction. Sulfate-reducing bacteria (SRB) reduce sulfate to sulfide and are known to be the most destructive microorganisms in anaerobic MIC. Accordingly, the current study attempted to elucidate the mechanisms involved and the relative importance of the corrosive products in SRB-induced corrosion. The measured rate of anaerobic corrosion of iron coupons by Desulfovibrio desulfuricans was $89.9{\;}\mu\textrm{g}{\;}\textrm{m}^{-2}{\;}d^{-1}$. Direct contact between the cells and the iron coupon did not seem to be necessary for corrosion to occur, since the corrosion rate was similar ($100.8{\;}\mu\textrm{g}{\;}\textrm{m}^{-2}{\;}d^{-1}$) when the coupon was enclosed in a dialysis bag. The participation of sulfide in the corrosion process was only marginal, as the specific corrosion rate was 2.5 times higher in a sulfate-free pyruvate medium than in an $H_2S-producing$ lactate medium. Acetate (18.8-22.1 mM), the end-product of pyruvate and lactate metabolism, was identified in the culture medium and thus presumed to play a major role in the corrosion process involving Desulfovibrio desulfuricans.

• 한국가스학회:학술대회논문집
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• 한국가스학회 2001년도 추계학술발표회 논문집
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• pp.45-57
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• 2001

An alternating current (AC) corrosion using coupon has been studied. Coupons were applied in terms of AC voltage from high value to low value through the survey of AC voltages on buried gas transmission pipeline over the country. Parameters such as AC current density of coupon, AC voltage, cathodic protection potential, soil resistivity and frequency were monitored continually. Corrosion induced by AC was observed even under cathodically protected condition that met cathodic protection criterion(: below -850mv vs. CSE). Corrosion rate was affected mainly not by AC voltage but by both of frequency and AC current density. An experimental corrosion rate relationship could be obtained statistically, in which AC corrosion rate increased linearly with effective AC current density and its slope was 0.619.

• 한국식품위생안전성학회지
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• 제29권4호
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• pp.253-259
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• 2014

본 연구는 polyvinyl chlroride (PVC)와 stainless steel 표면에서 B. cereus의 온 습도에 따른 생존율을 조사하고, B. cereus이 오염된 작업대 표면에서 상추로의 교차오염도 조사를 통하여 B. cereus에 오염된 작업대가 상추의 미생물학적 안전성에 미치는 영향을 평가하고자 수행하였다. 작업대 재질별 B. cereus의 생존은 온도 $20^{\circ}C$, $30^{\circ}C$, 습도 43%, 69%, 100%에서 각각 노출 시켰을 때, 습도 43%, 69% 조건에서 24시간 이내에 전체 세포수는 약 3.53~4.00 log CFU/coupon이 감소한데 반해 포자수는 약 3.00 log CFU/coupon 수준을 일정하게 유지하였다. 한편 온도 $30^{\circ}C$, 상대습도 100%에서는 노출 12시간 후에 포자수가 2.29~2.59 log CFU/coupon정도 증가하였다. 유기물이 작업대 표면에 존재 시, B. cereus의 감소 속도가 느렸다. B. cereus에 오염된 작업대에 상추를 접촉시키고 상추의 오염도를 조사한 결과, 상추 표면에 수분이 존재할 때 B. cereus오염된 작업대 표면에서 B. cereus의 이동수준이 상추에 수분이 없을 때 보다 10배 이상 증가하는 것으로 나타났다. 따라서 B. cereus에 오염된 작업대는 상추의 안전성에 직접적인 영향을 미칠 수 있어 작업 후에 세척, 소독을 통하여 작업대를 위생적으로 관리하는 것이 필요하다.