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무료 전환이 소비자 행동에 미치는 영향: 모바일 로그 데이터를 중심으로
한수현,정나영,장수령 한국경영과학회 2022 한국경영과학회지 Vol.47 No.3
As the mobile application market continues to grow and competition intensifies, many companies seek to change their pricing strategies (e.g., discounting) to attract competitors’ customers. However, empirical studies examining the related issues in the mobile app context are still lacking. This study investigates how making paid apps free of charge affects consumer behavior, especially app usage of competitors’ customers. Based on mobile log data analysis, our study shows that the transition from a paid to a free app makes competitors’ customers use the focal app more frequently. Furthermore, we find that consumer characteristics and online search interest have moderating effects. Our study provides crucial managerial implications for practitioners who manage mobile applications and mobile marketing.
한수현,김윤아,김성헌,이승환,이서영 대한수면연구학회 2019 Journal of sleep medicine Vol.16 No.2
Objectives: Cheyne-Stokes respiration (CSR) is frequently observed in acute stroke patients. In case of heart failure, CSR has been reported to be a poor prognostic factor. However, whether CSR has negative predictive value in stroke is not established yet. We aimed to investigate the relation between the presence of CSR and the outcome of acute stroke. Methods: We investigated the patients who were admitted with acute ischemic stroke and received sleep apnea test. We collected data on demographics, risk factors, etiologic subtypes and the parameters associated with respiratory events in sleep apnea test. Primary outcome was the occurrence of early neurologic deterioration (END) within 3 weeks. Secondary outcome included the modified Rankin Scale (mRS) score at 3 months after stroke. We assessed the risk of poor outcome associated with CSR using multivariate logistic regression. Results: Among 182 patients, 35 (19.2%) showed CSR in sleep apnea test. The presence of CSR in acute stroke was not associated with END, but associated with increased risk of 3 or higher mRS score at 3 months (odds ratio, 3.02; 95% confidence interval, 1.39 to 6.55) in univariate analysis. The association was still significant in large artery atherosclerosis group in stratified analysis. However, this association was insignificant in multivariate analysis which revealed that poor outcome at 3 months was associated with obstructive sleep apnea, as well as territory of internal carotid artery or basilar artery, initial National Institutes of Health Stroke Scale, and history of previous stroke. Conclusions: The presence of CSR was associated with poor functional outcome after acute stroke. However, large scaled study is needed to confirm the role of CSR as an independent prognostic factor of stroke.
한수현,정해봉,유일한,안석원 대한임상신경생리학회 2017 Annals of Clinical Neurophysiology Vol.19 No.1
The spinal segmental myoclonus by viral radiculitis has been rarely reported and the pathophysiology remains to be elucidated. However, the hyperactivity of contiguous anterior horn neurons induced by viral irritation has been suggested to be a possible patho-mechanism. In general, spinal segmental myoclonus is not well-controlled by medication and the patient suffers from continuous involuntary movement. We recently experienced a case of spinal segmental myoclonus induced by herpes zoster radiculitis, and which was successfully relieved by epidural injections.
우울 집단의 정서조절 전략과 정서 변화저항성의 관계 : 긍정반추, 가라앉히기 및 반추를 중심으로
한수현,김은정 한국청소년학회 2018 청소년학연구 Vol.25 No.2
Emotional inertial is an important emotion dynamical feature of depression, which is a concept that shows the tendency for emotional states to be resistant to change. The purpose of this study is to examine whether there is a difference in emotional inertia between two groups with different levels of depression, and to examine the variables that affect emotional inertia. Specifically, we first examined whether the depressed group and non-depressed group had different emotional inertia, and second, we examined the effects of positive emotion regulation strategies, positive rumination and dampening, and negative emotion regulation strategies, rumination on emotional inertia. 474 university students were screened for the high depressive group(N=26) and low depressive group(N=25), and the participants were asked to rate their positive and negative emotional states five times a day for three consecutive days through experience sampling method, and emotional inertia was calculated using these data. As a result of the hierarchical Linear Modeling, first, the high depressive group showed a higher emotional inertia in both positive and negative emotions than the low depressive group. Second, positive rumination was positively associated with emotional inertia of negative emotions in the high depressive group, and negatively associated with emotional inertia of positive emotions in the low depressive group. Third, Dampening does not have a significant effect on emotional inertia in both groups. On the other hand, rumination was positively associated with emotional inertia of negative emotions in the high depressive group, and negatively associated with emotional inertia of negative emotions in the low depressive group. Finally, the implication and limitations of this study and direction of future research were discussed. 정서 변화저항성이란 우울의 중요한 정서 역동적 특징으로서, 정서가 시간에 걸쳐 변화하지 않는 경향성을 나타내는 개념이다. 본 연구의 목적은 우울 수준이 다른 집단을 대상으로 정서 변화저항성에서 차이가 있는지를 확인하고, 정서 변화저항성에 영향을 주는 변인들을 검증하는 데 있다. 구체적으로 첫째, 우울한 집단과 그렇지 않은 집단이 정서 변화저항성에서 차이가 있는지를 확인하고, 둘째, 긍정정서 조절 전략인 긍정반추 및 가라앉히기와 부정정서 조절 전략인 반추가 정서 변화저항성에 미치는 영향을 살펴보았다. 474명의 대학생을 대상으로 우울 고집단(26명)과 우울 저집단(25명)을 선별하여, 경험표집법을 통해 하루에 5번씩 연속 3일간 긍정․부정 정서를 보고하게 하였고, 이를 통해 정서 변화저항성이 계산되었다. 위계적 선형모형을 통해 분석한 결과, 첫째, 우울 고집단은 우울 저집단에 비해 긍정정서와 부정정서 모두에서 더 높은 변화저항성을 나타냈다. 둘째, 우울 고집단은 긍정반추를 더 많이 할수록 부정정서에서 더 높은 변화저항성을 보였고, 우울 저집단은 긍정정서의 변화저항성이 감소하였다. 셋째, 가라앉히기는 두 집단 모두에서 정서 변화저항성에 유의한 영향을 미치지 않는 것으로 나타났다. 마지막으로, 우울 고집단은 반추 수준이 높을수록 부정정서의 변화저항성이 더 높아진 반면, 우울 저집단은 부정정서의 변화저항성이 감소하였다. 끝으로, 본 연구의 의의와 제한점 및 후속 연구의 방향에 관해 논의하였다.