정상 청력인에 있어서 유발이음향방사의 발성에 관한 연구

김정유,노관택 대한이비인후과학회 1989 대한이비인후과학회지 두경부외과학 Vol.32 No.3

LOCAL INTERACTION, ALTRUISM AND THE EVOLUTION OF NETWORKS

김정유,전택승 한국경제학회 2009 The Korean Economic Review Vol.25 No.2

We consider evolving networks on which players interact locally. In an evolutionary environment, players can increase their fitness either by changing their behavior or by changing their neighbors. We propose a static solution concept, what we call Stable Network Configuration (SNC). Roughly speaking, it requires that no player in the population distribution will change his type by imitating his best-performing neighbor, nor change his neighbor by rewiring his links. We characterize the necessary and sufficient conditions for the symmetric SNC in a network formation situation associated with the Prisoner's Dilemma game. Unlike the result by Eshel et al. (1998) that was obtained in a fixed circular network, all altruists and all egoists fare equally well and all altruists have links with some or all egoists in the symmetric SNC. We consider evolving networks on which players interact locally. In an evolutionary environment, players can increase their fitness either by changing their behavior or by changing their neighbors. We propose a static solution concept, what we call Stable Network Configuration (SNC). Roughly speaking, it requires that no player in the population distribution will change his type by imitating his best-performing neighbor, nor change his neighbor by rewiring his links. We characterize the necessary and sufficient conditions for the symmetric SNC in a network formation situation associated with the Prisoner's Dilemma game. Unlike the result by Eshel et al. (1998) that was obtained in a fixed circular network, all altruists and all egoists fare equally well and all altruists have links with some or all egoists in the symmetric SNC.

Law and Economics of Artificial Intelligence: Optimal Liability Rules for Accident Losses Caused by Fully Autonomous Vehicles

김정유 한국경제학회 2024 The Korean Economic Review Vol.40 No.1

We examine the optimal liability rule in accidents involving fully autonomous vehicles. In cases where enforcing due activity is not feasible, it is socially optimal to apply the strict liability rule to the human operator determining the activity level and to apply the negligence rule to the manufacturer and the victim who select care levels under contributory or comparative negligence in the unilateral activity case. Under the joint and several liability rule, both the manufacturer and the victim exercise due care, contingent on regulating the manufacturer’s liability share sufficiently high, and the human operator assuming the remaining risks chooses the socially optimal activity level maximizing the social net benefit. Conversely, if due activity enforcement is possible, an alternative liability rule proves optimal. Under this rule, the human operator engages in efficient activity to comply with the activity standard, the manufacturer exercises efficient care to meet the care standard, and the victim assumes residual liability so as to be induced to take efficient care. Notably, this liability rule achieves the social optimum, even in bilateral activity cases where both the human operator and the victim engage in activity. Our results diverge from previous findings suggesting that achieving the social optimum involves using public sanctions, such as paying a fine to the state.

The Economics of Curiosity

김정유,민인식,이해리 한국경제학회 2013 The Korean Economic Review Vol.29 No.1

We develop the hypothesis that an individual can get some value of information, even if they do not use the information for his subsequent decision, contrary to the expected utility theory. Curiosity is associated with the direct utility from information and is defined formally by using the concept of entropy. We can measure an agent's curiosity level by the maximum amount of money that he is willing to pay in order to obtain the information thereby reducing the entropy. We test the hypothesis from lab experiments and obtain the empirical evidence that people are actually willing to pay a positive amount of money to obtain payoff-irrelevant information. Also, the comparison of the coefficients of variation for our curiosity measure and the IPI (Imaginal Processes Inventory) curiosity measure which is widely used in psychology suggests that our measure is more informative.

착신과금방식의 사회적 후생 효과

김정유,임윤성 에스케이텔레콤 (주) 2002 Telecommunications Review Vol.12 No.1

본 논문에서는 착신과금방식(RPP:Receiver Pays Principle)의 도입 시 사회후생에 미치는 효과를 분석하고자 한다. 착신과금방식을 도입할 경우의 문제점은 착신자가 부담해야 하는 요금이 지나치게 높을 경우 착신자가 수신을 거부할 가능성이 있다는 점이다. 우리는 발신자와 착신자에게 부과되는 이윤 극대화 가격들은 반드시 수신 거부가 발생하지 않을 조건을 만족해야 함을 입증해 보일 것이다. 또한 착신과금방식 하에서 소비자 잉여는 낮은 발신요금에도 불구하고 반드시 증가하지는 않지만 사회 후생은 항상 증가한다는 것을 입증할 것이다.

무선 데이터 통신 과금체계에 대한 경제학적 고찰

김정유 한국조세연구원 2004 재정연구 Vol.10 No.2

청년여성의 출산·육아서비스만족도와 지역생활만족도가 삶의 만족도에 미치는 영향 - 사회안전인식도의 조절된 매개효과 검증 -

김정유,엄광진 사단법인 한국안전문화학회 2024 안전문화연구 Vol.- No.28

The purpose of this study is to examine the moderated mediating effect of perception of social safety and the mediating effect of satisfaction with community life on the relationship between satisfaction with childbirth·childcare social service and life satisfaction among young women. To do this, this study used the 2022 Gangwon provincial social survey data conducted by Gangwon provincial office. The sample consisted of 296 young women(20s-30s), and the data were analyzed using SPSS 21.0 and PROCESS Macro 4.2(Model 4 and Model 14). The main results of this study are as follows: First, this study found that a higher level of satisfaction with childbirth·childcare social service was associated with a higher level of life satisfaction among young women. Second, a fully mediating effect of satisfaction with community life was found on the relationship between satisfaction with childbirth·childcare social service and life satisfaction among young women. Third, the mediating effect of satisfaction with community life on the relationship between satisfaction with childbirth·childcare social service and life satisfaction was moderated by perception of social safety. Based on those study results, this study discussed practical and policy implications for enhancing life satisfaction among young women.

보완제품시장에서의 진입저지와 진입유도

김정유 한국규제학회 1997 규제연구 Vol.6 No.4

團束에 관한 事前豫告의 事故豫防效果에 대하여

김정유 홍익대학교 경제연구소 1994 經濟硏究 Vol.10 No.-

우리는 安全規制 模型에 있어서의 事前的 對話(pre-play communication, cheap talk)의 역할을 고찰하고자 한다. 만약 정부가 국민들의 안전을 위하여, 그들의 不注意한 행위를 단속하리라는 것을 事前에 公表할 경우, 이러한 團束에 관한 公表는 그 이행여부에 대한 法的拘束力이 전혀 없는 行政措置임에도 불구하고, 국민들로 하여금 사회적으로 보다 더 바람직한 수준의 主義를 기울이게 하는 실질적 효과를 가져올 수 있는 바, 이 이 論文에서는 이를 가능하게 하는 起作(mechanism)을 규명하고자 한다.

보건소 금연클리닉의 금연치료 결과에 대한 자가보고와 요중 코티닌 검사 간의 일치도

김정유,권민,조근호,채숙희,원왕연,김대진 대한정신약물학회 2010 대한정신약물학회지 Vol.21 No.4

자가보고는 국내 보건소의 금연클리닉에서 금연 성공 여부를 평가하기 위한 여러 연구에서 사용되고 있다. 본 연구에서는 금연 프로그램 시행 후 금연 여부에 대한 자가보고와 요중 코티닌 농도 검사를 시행하여 두 검사 결과 간의 일치도와 현재 흡연 여부의 판단에 있어 자가보고의 유용성을 평가하였다. 결과로는 흡연 여부에 대한 자가보고와 요중 코티닌 검사 결과의 일치도와 자가보고의 민감도, 음성 예측도는 낮았다. 따라서 자가보고만으로는 금연 치료의 성공을 평가하는 데 있어 충분하지 못하며 요중 코티닌 검사와 같은 객관적인 평가 방식이 추가적으로 사용되어야 할 것이다. Objective Self-report is being used in most of studies investigating the therapeutic effect of smoking cessation clinics of public health centers in Korea instead of cotinine or other chemical markers of nicotine exposure. This study was conducted to evaluate the agreement between self-report and urinary cotinine test after smoking cessation program. Methods The study subjects were 333 adult male who visited public health center and participated in 12-week scheduled smoking cessation program. Questionnaires including demographic data and information about cigarette use, blood test, and urinary cotinine test were performed to all subjects during initial evaluation. At the end of the program, smoking status of subjects was assessed by an oral self-report and additional blood and urinary cotinine tests were done to the subjects who agreed. Results 52 participants who gave both self-report on smoking status and urine sample were included in the final analysis. The overall percentage agreement was 67.3%, and the overall Kappa index was 0.367. The sensitivity, specificity, positive predictive value, and negative predictive value of self-report in detecting smoking state were 46.43%, 91.67%, 86.67%, and 59.46%, respectively. Conclusion The agreement between self-report and urinary cotinine test in detecting smoking status after smoking cessation program was relatively low on account of participants who failed to quit smoking but reported their smoking status incorrectly. Therefore, the use of objective measures such as urine cotinine should be considered in evaluation of successful smoking cessation.