• Information Systems Review
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• v.20 no.3
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• pp.51-71
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• 2018

Many studies in the field of information security reveal the need to increase awareness. However, although awareness of information security has been raised to a considerable extent, actual security behavior has been shown to fall short of that. Therefore, we wanted to identify the role of psychological factors in making information security decisions by conducting a experimental study. The results show that there are differences in perception of information security risks according to the probabilistic distance and the degree of relative optimism due to social distance. In relation to their relative optimism and intention of information security, they reduced the level of perceived risk compared to those close to them and found that their influence varied according to their probabilistic distance. This study has made valuable attempt in terms of methodology and it is meaningful that the psychological factor is taken into consideration for the information protection behavior, so that the range of relative optimism that actually affects the perception of risk is narrowed. It is expected to contribute to the improvement of information security level of information technology users and protection of information assets by empirically identifying necessity of various approaches to decision making process for information security.

• Korean Journal of Childcare and Education
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• v.8 no.5
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• pp.231-252
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• 2012

This study examined the influence of job stress and personal resources (hardiness, optimism) of child counselors on their burnout and work engagement. For the study, 171 child counselors were surveyed. The main effects of job stress and personal resources on burnout and engagement were tested using hierarchical multiple regression analysis. The findings of this study were as follows: First, the study showed that both job stress and personal resources were related to burnout and work engagement. Specially, job stress was more closely related to burnout, whereas personal resources were more closely related to work engagement. Second, hardiness as personal resources reduced the level of burnout in child counseling. Third, although job stress negatively affected the level of work engagement, personal resources (hardiness, optimism) were relevant predictors of work engagement. Hardy and optimistic child counselors are less likely to experience burnout, they are more likely to experience vigor, dedication, and absorption on their job. Based on the results of this study, the practical implications for child counselors were discussed.

• Journal of Digital Convergence
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• v.20 no.5
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• pp.23-29
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• 2022

Digital services improve existing ways of purchasing contracts. In this study, we empirically analyzed the effects of individual technology readiness (optimism, innovation, inconvenience, anxiety) on the acceptance intention of cloud computing technology for users with relatively high understanding of cloud service. Also, the effect of technology readiness on acceptance intention was verified by the mediating effect of digital conversion. As a result, optimism and innovation had a positive effect on digital conversion, and discomfort and anxiety had a negative effect on digital conversion. And although the partial mediating effect of digital conversion was verified in the relationship between optimism, anxiety and acceptance intention, it was verified that there was no mediating effect of digital conversion in the relationship between innovation, discomfort and acceptance intention. Through these results, the practical implications and future research directions of cloud services were presented to companies.

• Journal of KIISE:Databases
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• v.28 no.3
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• pp.458-467
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• 2001

Optimistic Two-Phase Locking(O2PL) performs as well as or better than the other approaches because it exploits client caching well and also has relatively lower network bandwidth requirements. However, O2PL leads to unnecessary waits, because, it can not be commit a transaction until the transaction obtains all requested locks. In addition, Optimistic Concurrency Control(OCC) tends to make needless aborts. This paper suggests an efficient optimistic cache consistency protocol that overcomes such shortcomings. Our scheme decides whether to commit or abort a transaction without wait and it adopts transaction re-ordering in order to minimize the abort rate. Our scheme needs only one version for each data item in spite of the re-ordering mechanism used. Finally, this paper presents a simulation-based analysis that shows superiority in performance of out scheme to O2PL and OCC.

• Journal of KIISE:Databases
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• v.29 no.6
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• pp.477-491
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• 2002

The broadcast environment has asymmetric communication aspect that is typically much greater communication bandwidth available from server to clients than in the opposite direction. In addition, mobile computing systems generate mostly read-only transactions from mobile clients for retrieving different types of information such as stock data, traffic information and news updates. Since previous concurrency control protocols, however, do not consider such a particular characteristics, the performance degradation occurs when previous schemes are applied to the broadcast environment. In this paper, we propose optimistic concurrency control based on timestamp interval for broadcast environment. The following requirements are satisfied by adapting weak consistency that is the appropriate correctness criterion of read-only transactions: (1) the mutual consistency of data maintained by the server and read by clients (2) the currency of data read by clients. We also adopt the timestamp Interval protocol to check the weak consistency efficiently. As a result, we improved a performance by reducing unnecessary aborts and restarts of read-only transactions caused when global serializability was adopted.

• Proceedings of the KAIS Fall Conference
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• 2011.12a
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• pp.140-143
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• 2011

지역박물관은 규모와 재정의 영세성이라는 한계와 더불어 수도권에 극심한 집중을 보이는 우리나라의 사회 문화적 특성에 따라 상대적으로 운영에 어려움을 겪고 있다. 지역 박물관은 교통 수단의 발달과 지방자치제의 시행으로 낙관적인 시각에서 개관이 이루어진 경우가 많다. 그러나 저출산과 인구의 노령화 등으로 우리나라도 성장이 둔화되고 과거와 같은 성장을 기대하기 어려운 상황에서 지역박물관은 나름의 자구책을 찾고 있는 상황이다. 문화기관의 마케팅은 과거에는 생소한 개념이었으나 치열해진 경쟁 속에서 이제는 박물관 경영의 필수 요소로 요구되는 시점이다. 본 연구는 지역 박물관의 공간 마케팅을 소비자 이해의 관점에서 고찰하였다.

• The Korean Journal of Financial Studies
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• v.9 no.1
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• pp.163-187
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• 2003

본 연구는 옵션가격 및 거래량 자료를 이용하여 옵션시장의 가격발견 기능에 대해서 분석을 시도하였다. 이를 위해 먼저 옵션가격과 거래량 정보가 현물시장을 선행하는 현상에 대해서 분석해 보았다. 옵션가격은 실제 현물지수를 약 1시간 정도 선행하는 것으로 관찰되었다. 콜옵션 가격이 풋옵션에 비해서 상대적으로 옵션시장에서 높게 거래되는 경우 이는 현물주식시장에서의 주가상승을 예고하는 것으로 나타났다. 옵션 거래량 정보 역시 현물시장의 가격움직임을 예측하는데 유효한 것으로 관찰되었다. 콜옵션의 풋옵션 대비 상대적인 거래증가는 투자자의 낙관적인 장세전망을 반영해 일단 현물지수의 상승을 야기하는 것으로 나타났으나 이후 투자자의 풋옵션을 통한 헤지(hedge) 수요의 증가로 이어지는 것으로 조사되었다. 두 번째로 본 연구는 이러한 옵션시장의 가격발견 기능을 이용하여 매매전략을 수립하고 이를 통하여 투자이익을 극대화시킬 수 있는지에 대해서 살펴보았다. 콜옵션 가격(거래량)이 풋옵션 가격(거래량)에 비해 고평가(증가) 되었을 경우 이는 주가상승을 미리 예고하고 있는 신호로 받아들어져 주식을 매입하고 반대로 콜옵션 가격(거래량)이 풋옵션 가격(거래량)에 비해 저평가(감소) 되었다면 주가하락을 예측하기 때문에 주식을 매도함으로써 투자이익을 증대시킬 수 있을 것이다. 실증분석 결과는 우선 옵션 가격정보를 이용하여 현물시장에서 지수 바스켓 포트폴리오를 매매하려는 전략은 30분 내외의 단기 투자에는 유효하나 그 이상의 투자기간을 가지는 경우에는 예상과는 다른 결과를 초래하였다. 반면 옵션시장에서의 콜옵션과 풋옵션의 상대적인 거래량 정보는 현물주식시장의 움직임을 예측하는데 옵션 가격정보에 비해서 보다 효과적인 것으로 판단되었다. 조사한 모든 일중 및 1일(overnight) 투자수익률에서 옵션 거래량의 상대적 비율에 의거한 투자전략은 통계적으로 유의한 투자수익률의 차이를 가져왔다.

• Journal of Service Research and Studies
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• v.11 no.3
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• pp.1-16
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• 2021

Recently, crowdfunding has been receiving increased attention due to the variety of novel ways it provides for connecting funders and fundraisers. Concurrently, however, it has been criticized on the grounds of information asymmetry. We are interested in whether information collected from an asymmetric information source significantly influences crowdfunding success. Through this study, we would like to establish a social field of convergence pursued by Serve Science and to conduct practical research and practice together. First, we investigated the importance of interaction between funders and fundraisers within the crowdfunding platform. In the "comments" section, communication between funders and fundraisers reduces the degree of asymmetric information. In the aspect of presumable funders, they should make the best of the "comments" section to collect more solid information without losing return on their investment. Second, we analyze sentiment-based optimistic and pessimistic information from the "story" (asymmetric source) and "comments" sections. In conclusion, it shows that the optimistic and pessimistic information of the "comments" section has a great impact on crowdfunding success and that the influence of the "story" section is limited to pessimistic information under certain conditions. The crowdfunding platform is an innovative and productive way for startups and entrepreneurs to start a business, and since information an important role in the success of crowdfunding, It can be seen that it is essential to focus on establishing the best communication methods.

• The Korean Journal of Financial Management
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• v.27 no.1
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• pp.31-62
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• 2010

This paper analyzes empirically how analysts' forecasts affected by ownership structure. This study examine a sample of 1,037~1,629 the analysts' forecasts of firms registered in Korean Stock Exchange in the period from 2000 to 2006. The empirical results are summarized as follows. First, from the analysis, companies which have higher major shareholder's holdings tend to increase earnings forecast errors and earnings forecast accuracy. Meanwhile, companies which have higher institution shareholder's holdings tend to decrease earnings forecast errors and earnings forecast accuracy. This result is in line with the view of previous works that companies with higher major shareholder's holdings look towards more of analysts' optimistic forecasts in order to maintain friendly relations with major shareholders. Because of analysts' private information use from major shareholders, earnings forecast accuracy is higher in high major shareholder's holdings firm than in high institution shareholder's holdings it. Second, this analysis is whether the minimal required selection condition of outside directors, audit committee adoption and audit quality affect the relation between ownership structure and analysts' forecasts. This result is that variables related corporate governance do not affect statically the relation between ownership structure and analysts' forecasts. The meanings of this paper is to suggest the positive relations between ownership structure and analysts' forecasts. After this, if analysts will notice forecasts of more many firms, capital market will be more efficient and this field works are plentiful. Also it will need monitoring systems not to distort market efficiency by analysts' dishonest forecasts.

• The Journal of the Korea Contents Association
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• v.18 no.4
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• pp.60-76
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• 2018

The objective of this study was to determine the effects of self-differentiation and ego-resilience on service maladjustment behaviors of Social Service Agent. To achieve this, we chose these research questions. To verify these research questions, data were collected by distributing 470 questionnaires to Social Service Agent serving in service organizations located in Seoul. Four hundred twenty-seven surveys were used for statistical analysis. The results of this study are as follows: First, Social Service Agents were shown to generally adjust well to service, as self-differentiation and ego-resilience were slightly higher than the median, while service maladjustment behavior was slightly lower than the median. Second, when the effects of sociodemographic characteristics, self-differentiation and ego-resilience on service maladjustment behavior were studied, all values of sociodemographic characteristics, self-differentiation and ego-resilience affected all lower factors of service maladjustment behavior with significance. For social withdrawal, the effectiveness of interpersonal relations, optimistic attitude, and the degree of family regression had a negative correlation, and emotional divorce, education level, and term of service had a positive correlation. The degree of family regression, anger management, and cognitive function vs. emotional function had a negative correlation with hyperactivity while self unity had a positive one. Family regression, cognitive function vs. emotional function, anger management, and family's economic level negatively correlated with aggression. Family regression, optimistic attitude, cognitive function vs. emotional function, family's economic level and term of service had a negative correlation with obsession and compulsion.