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개인정보 유출사고 이후 기업의 주가변동 패턴에 대한 고찰
김태환,이해니,유진호 한국경영정보학회 2014 한국경영정보학회 학술대회논문집 Vol.2014 No.1
최근 발생하고 있는 개인정보유출 사고는 더 이상 개인의 피해만으로 끝나지 않으며 기업의 가치와 신 뢰도에 큰 영향을 미치게 되었다. 따라서 개인정보 유출사고가 기업에 어떤 영향을 미치는지에 대한 다 양한 연구들이 진행되어 왔으며, 기존 연구들에서는 개인정보유출 사고가 기업 가치에 부정적인 영향을 끼치는 것으로 분석되었다. 본 연구에서는 기존 연 구에서 더 발전시켜 개인정보 유출사고 발생 직후에 나타나게 되는 기업 주가 변화를 7가지 패턴으로 분 류하였다. 또한 이 패턴을 개인정보유출사고 기업에 적용하여 수치화하였다.
김태환,Kim, Tae-Hwan Society of Korea Industrial and System Engineering 2018 한국산업경영시스템학회지 Vol.41 No.3
While the term online shopping refers to all online transactions, cross-border online shopping means shopping activities purchasing products or services over the internet for the customers abroad. As Internet use for the international shopping activity increasing, cross border online shopping has grown substantially for last decade. This study is about the problem regarding the cross border online shopping for two different countries and the variables that influence their shopping behavior. The cross border online shopping has been increased by the growth of Internet access. However, the growth of the Internet use does not guarantee a successful development of cross border e-commerce for every country. To find out the perception for cross-border online shopping for two different cultures, shoppers from two countries with different cultural background were chosen, and the perception for cross-border online shopping from each culture is contrasted. For statistical Analysis, ANOVA is used to find the relationship between a single non-metric independent variable, and multiple metric dependent variables. Hofstede's cultural dimensions model is adopted for this study as a tool to find out the patterns of cross border online shopping. This study showed what the variables would affect the perception in cross border online shopping. The results of this study indicated that cross border online shoppers with different culture were notably different on two variables identified-timeliness and ease of use.
척추마취시 수액의 가온, 감각차단의 높이 및 피부온도가 마취후 전율에 미치는 영향
김태환,안승원 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.37 No.5
Background: Shivering, which occurs in the postanesthetic period, annoys many patients, so we examined the correlation of postanesthetic shivering (PAS) and warming intravenous fluids, the level of sensory blockade, and skin temperature during spinal anesthesia. Methods : 65 patients undergoing an operation on a lower extremity were randomly allocated to 2 groups. The patients in group 1 and 2 received 500 ml of the unwarmed (ambient temperature) and warmed fluids prior to spinal anesthesia, respectively. All patients were anesthetized with 0.5% bupivacaine in 8% glucose. We measured the decrements of mean blood pressure (MBP) and heart rate, the highest sensory block level, and the increment of skin temperature 30 min after anesthesia, and the operating room temperature. After the operation we also evaluated the PAS by using the 10-mm visual anlalogue scale. Results : The decrement of MBP was higher in group 2 than in group 1 (13 mmHg vs 5 mmHg, P< 0.05). The highest sensory block level was higher in grou 2 than in group 1 (T6.4 vs T7.6, P< 0.05). However, there was no significant difference in heart rate decrement, skin temperature increment, ambient temperature, and PAS between groups. The more the MBP decrement, the less the PAS in all patients (r = 0.326, P = 0.008) and in group 1 (r = 0.480, P = 0.005), but there was no correlation between PAS and MBP decrement in group 2. The more the ambient temperature, the less the PAS in all patients (r = 0.334, P = 0.007), in group 1 (r = 0.386, P = 0.027), and in group 2 (r = 0.394, P = 0.026). The heart rate decrement, skin temperature increment, and sensory blockade level did not correlate with PAS. Conclusions : PAS lowers as MBP decreases and operating room temperature increases during spinal anesthesia, but warming intravenous fluids, sensory block level, and skin temperature change doesn't affect PAS. (Korean J Anesthesiol 1999; 37: 787∼792)
미추마취시 첨가한 Fentanyl 혹은 Clonidine 이 술후 진통과 요정체에 미치는 영향
김태환,김미운,안승원,김웅,추동훈,김형태 대한마취과학회 2001 Korean Journal of Anesthesiology Vol.40 No.5
Background: Caudal administration of local anesthetics, opioids, and the a2 adrenergic agonists is effective for postoperative pain. Intrathecal and epidural opioids may commonly result in urinary retention. The purpose of this study was to evaluate the effects of fentanyl or clonidine on postoperative analgesia and urinary retention. MethodsL: Forty patients undergoing a hemorrhoidectomy were randomly assigned to receive 20ml of 2% lidocaine and 1:200,000 epinephrine plus clonidine 100 ㎍(group C100,n=10), clonidine 150 ㎍(group C150,n=10), fentanyl 50 ㎍(group F50,n=10), or fentanyl 100 ㎍(group F100,n=10) for caudal anesthesia. Mean arterial pressure (MAP) and heart rate (HR) were measured before anesthesia and immediately postanesthesia, and every 5 min after caudal administration for 30 min. The following variables were recorded; onset time, analgesic time, voiding time, and urinary retention. Results: The MAP at 20, 25, and 30 min in group C150 (91±7, 91±6, and 90±7 mmHg, respectively) was less than in group F50 (99±4, 101±6, and 101±5 mmHg, respectively) (P<0.05). There was no difference in HR and onset time of anesthesia among the groups. Analgesic times in groups C150, F50, and F100 (270±22, 265±23, and 323±82 min, respectively) were longer than in group C100(207±59 min), (P<0.05). The number of patients using a urinary catheter to void was much higher in group F100 (7 patients) than in the groups C100, C150, or F50 (4, 5, and 3 patients, respectively) (P<0.05). The voiding time was longer in group C150 than in group C100 (369±122 min vs 266±83 min, P<0.05). No side effects were reported. Conclusions: We conclude that clonidine 150㎍ is adequate to provide effective analgesia and a low incidence of urinary retention during caudal anesthesia.
변조 도핑된 InAsxP₁-x/InP 변형된 단일 양자 우물에서의 전자 부띠에 관한 연구
김태환 광운대학교 기초과학연구소 1996 기초과학연구소논문집 Vol.25 No.-
Shubnikov-de Haas (S-dH) and Van der Pauw Hall effect measurements on modulation-doped ??/InP strained quantum wells have been carried out in order to investigate the electrical properties in ??/InP strained quantum wells. The S-dH measurements at 4.2 K and fast Fourier transformation of the data showed that a two-dimensional electron gas was occupied by one subband in the ?? well. Electronic subband energies and wavefunctions in the ?? strained quantum well were calculated by a self-consistent method taking into account the exchange-correlation effects together with the strain effects. The calculated subband carrier density in the ??/InP highly strained quantum well taking into account the strain effect was in very good agreement with that obtained from the measurements.