• Survey Research
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• v.5 no.1
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• pp.27-49
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• 2004

Recently, in several countries including South Korea, the percentage of households having fixed telephones, which is often called the fixed telephone coverage rates, has decreased due to a rapid spread of mobile phones. It is generally assumed that the lower the rates of coverage, resulting in a major frame undercoverage problem, the greater the possibility of the bias. In this paper, we first take a look at the changes of coverage rates in both fixed telephones and mobile phones in South Korea and examine the coverage rates by sociodemographic characteristics of households. Also, we refer to a change in the level of fixed telephone noncoverage and the resulting problems in the situation. Second, we provide a comparison of the coverage rates for households for some European countries, the United States, Canada etc. Finally, we suggest further research to rise to our research environments increasingly troublesome, owing to the wide spread of mobile phones.

• Journal of the Korean earth science society
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• v.33 no.2
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• pp.113-125
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• 2012

The estimations of the surface rain intensity and rain-related physical variables derived from two independent Tropical Rainfall Measuring Mission (TRMM) satellite sensors, TRMM Microwave Imager (TMI) and Precipitation Radar (PR), were compared over four different oceans. The precipitating clouds developed most frequently in the warmest sea surface temperature (SST) region of the west Pacific, which is 1.5 times more frequent than in the east Pacific and the tropical Atlantic oceans. However, the east Pacific exhibited the most intense rain intensity for the convective and mixed rain types while the tropical Atlantic showed the most intense rain intensity for all TMI rainy pixels. It was found that the deviation of TMI-derived rain rate yielded a big difference in region-to-region and rain type-to-type if the PR rain intensity value is assumed to be closer to the truth. Furthermore, the deviation by rain types showed opposite signs between convective and non-convective rain types. It was found that the region-to-region deviation differences reached more than 200% even though the selected tropical oceans have relatively similar geophysical environments. Therefore, the validation for the microwave rain estimation needs to be performed according to both rain types and climate regimes, and it also requires more sophisticated TMI algorithm which reflects the locality of rainfall characteristics.

• Survey Research
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• v.6 no.2
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• pp.51-74
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• 2005

The internet survey methods have been more and more widely used as the coverage of the fixed-line telephone is being reduced due to the diffusion of mobile phone. So, there is a need to know the accuracy of this new survey method. This study aims to estimate the accuracy of the internet survey method and identify the factors affecting the accuracy of this method, For this purpose, we analyzed the election poll data during the 17th general election period. These data include fixed-line telephone survey data, internet survey data, mobile phone survey data and the election voting data. The analysis shows that the prediction errors of the internet survey were a little more than those of the telephone or mobile phone survey. But the differences are not significant. It follows from this result that we can use the internet survey method in social survey context. This study also found that the respondent's willingness to participate in the survey, the probability of being at home during survey and the respondent's educational level were affecting the accuracy of the internet survey. Further studies to develop weighting method with these factors are needed.

• Journal of Digital Convergence
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• v.19 no.8
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• pp.161-171
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• 2021

According to the equity home bias theory, foreign investors are considered to have less information than native investors. However, as the economy becomes liberalized and overseas economic innovation has a great influence on the local economy, it is possible for foreign investors to invest as informed traders. This study analyzes whether information on trade amount by nationality has specific characteristics. The findings are summarized as follows. First, the increase in trading by foreign investors has negative effects on stock returns. There is no significant difference in these negative effects by nationality. This means that foreign investors show strong herd behavior regardless of nationality. Second, foreigners' investment activities increase stock price volatility, but the impact is not significant. Third, the behavior of foreign investors is still positive feedback. However, there are signs that positive feedback behavior may be changing, especially for funds from the United States and the Cayman Islands. Finally, tax haven zone funds have different investment strategies than other foreign investors. However, Cayman Islands funds, which are estimated to be closely related to Korea, are different from Luxembourg and Ireland funds. These findings undermine the fundamentals of the equity home bias theory.

• Journal of Intelligence and Information Systems
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• v.29 no.3
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• pp.125-144
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• 2023

Recently, the use of Large Language Models (LLMs) such as ChatGPT has been increasing in various fields such as interactive commerce and mobile financial services. However, LMMs, which are mainly created by learning existing documents, can also learn various human biases inherent in documents. Nevertheless, there have been few comparative studies on the aspects of bias and discrimination in LLMs. The purpose of this study is to examine the existence and extent of nine types of discrimination (Age, Disability status, Gender identity, Nationality, Physical appearance, Race ethnicity, Religion, Socio-economic status, Sexual orientation) in LLMs and suggest ways to improve them. For this purpose, we utilized BBQ (Bias Benchmark for QA), a tool for identifying discrimination, to compare three large-scale language models including ChatGPT, GPT-3, and Bing Chat. As a result of the evaluation, a large number of discriminatory responses were observed in the mega-language models, and the patterns differed depending on the mega-language model. In particular, problems were exposed in elder discrimination and disability discrimination, which are not traditional AI ethics issues such as sexism, racism, and economic inequality, and a new perspective on AI ethics was found. Based on the results of the comparison, this paper describes how to improve and develop large-scale language models in the future.

• Korean Journal of Environment and Ecology
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• v.38 no.3
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• pp.230-245
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• 2024

Amphibians, sensitive to external environmental changes, serve as bioindicator species for assessing alterations or disturbances in local ecosystems. It is known that one-third of amphibian species within the order Anura are at risk of extinction due to anthropogenic threats such as habitat destruction and fragmentation caused by urbanization. To develop effective protection and conservation strategies for anuran amphibians, species surveys that account for population characteristics are essential. This study aimed to investigate the potential for citizen participation in ecological monitoring using the mating calls of anura species. We also proposed suitable quality control measures to mitigate errors and biases, ensuring the extraction of reliable species occurrence data. The Citizen Science project was carried out nationwide from April 1 to August 31, 2022, targeting 12 species of anura amphibians in Korea. Citizens voluntarily participated in voice signal monitoring, where they listened to anura species' mating calls and recorded them using a mobile application. Additionally, we established a quality control process to extract reliable species occurrence data, categorizing errors and biases from citizen-collected data into three levels: omission, commission, and incorrect identification. A total of 6,808 observations were collected during the citizen participation in anura species vocalization monitoring. Through the quality control process, errors and biases were identified in 1,944 (28.55%) of the 6,808 data. The most common type of error was omission, accounting for 922 cases (47.43%), followed by incorrect identification with 540 cases (27.78%), and commission with 482 cases (24.79%). During the Citizen Science project, we successfully recorded the mating calls of 10 out of the 12 anuran amphibian species in Korea, excluding the Asian toads (Bufo gargarizans Cantor), Korean brown frog (Rana coreana). Difficulties in collecting mating calls were primarily attributed to challenges in observing due to population decline or discrepancies between the breeding season of non-emergent individuals and the timing of the citizen science project. This study represents the first investigation of distribution status and species emergence data collection through mating calls of anura species in Korea based on citizen participation. It can serve as a foundation for designing future bioacoustic monitoring that incorporates citizen science and quality control measures for citizen science data.

• Survey Research
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• v.2 no.1
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• pp.37-57
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• 2001

Much effort has been made to measure regional difference showing the pattern of regionalism in Korea. Focusing the concept of social distance. this paper examines various election and regional preference data. The paper presets three major findings. First. current election data show clear regional cleavage. Second. regional discrimination and prejudice is often found in one's everyday life. Third, political aspect of regionalism is strongly related to social aspect of regionalism. These findings suggest that regionalism in Korea will survive for the time being. The regionalism is rooted in everyday life . To political elites. it became an attractive and economic way to maintain their power. This tendency will promote the preference for parliamentary system among political elites and the possibility of appearance of regional party

• Korean journal of communication and information
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• v.82
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• pp.7-28
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• 2017

This paper argues that media criticism should be reestablished as an academic movement leading to the maintenance and maturity of democracy. Korean democracy has been withdrawn both procedurally and practically. However, the Korean media do not properly monitor democratic retreat. The purpose of journalism is to provide people with the information they need to be free and self-governed, and the public sphere is a condition of deliberative democracy. This paper proposed three practical strategies for media criticism. First, it is the overcoming of the conservative-progressive frame. It is important to look at what kind of media is responsible for democratic retreat. Second, media criticism should be expanded on workers and capitalists. Korea's labor relations are as distorted as the public sphere. Korean journalism did not set agenda for labor relations. Most reports were 'capitalist bias'. Finally, Media criticism should be the empowerment of the people who are the sovereigns of the media.

• Proceedings of the Korean Association for Survey Research Conference
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• 2001.04a
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• pp.37-57
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• 2001

Much effort has been made to measure regional difference showing the pattern of regionalism in Korea. Focusing the concept of social distance, this paper examines various election and regional preference data. The paper presets three major findings. First current election data show clear regional cleavage. Second, regional discrimination and prejudice is often found in one' s everyday life. Third, political aspect of regionalism is strongly related to social aspect of regionalism. These findings suggest that regionalism in Korea will survive for the time being. The regionalism is rooted in everyday life. To political elites, it became an attractive and economic way to maintain their power. This tendency will promote the preference for parliamentary system among political elites and the possibility of appearance of regional party.

• Korean Journal of Social Welfare
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• v.59 no.1
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• pp.275-300
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• 2007

This study explores the trends and implications of social welfare qualitative research in Korea. The results are follows. At present, social welfare qualitative research is entering in the quickening period. The characteristics of configuration of social welfare qualitative research in Korea are overwhelming inferiority in post-positivism and heuristics, wide differences between universities in metropolitan area and in local area at the aspect of amounts of qualitative research products, rapid increase in the interests of qualitative research in doctoral candidates, and distinguishment of doctoral candidates as a leader group in qualitative research. The results of critics of qualitative researches are follow: 1) initiative of naturalistic interpretism 2) inclination of methodicism 3) poorness of critical themes 4) propensity in grounded theory. These trends of social welfare qualitative research in Korea, in spite of the limits, have various implications: 1) Trying to critics of social welfare knowledge based on positivism and formation of opposing discourse to positivism 2) diversification in paradigm of inquiry 3) spread of narrative thinking of social welfare phenomenon.