Tracking individuals and households: longitudinal features of Danseong household register data

Household registers, which were compiled every three years and contained a variety of demographic information, are invaluable sources with which to investigate family and demographic behaviors of historical populations in Korea, especially during the period of the eighteenth and nineteenth centuries. Linking three sets of household registers that covered the area of Danseong from 1780 to 1786, in this study we examine longitudinal features of Korean household registers. We assess the degree of attrition over six years at both individual and household level, and identify social and demographic characteristics associated with attrition. Our investigation shows a considerable degree of attrition of individuals and households over six years which is significantly associated with the social status of individuals and the household heads. We supplement the analysis of exits with the analysis of new entrances, which shows that in each year of register a substantial number of individuals, comparable to the size of individuals and households lost, were newly added. Those who newly entered the registers are very similar in their characteristics to those who exited the registers. We discuss the implications of our findings for studies that rely on Korean household registers to examine family and demographic behaviors of historical populations in Korea and East Asia.     

Marital fertility during the Korean demographic transition: child survival and birth spacing

In this paper, we examine marital fertility patterns during the demographic transition in Korea. The demographic transition was a fundamental transformation in human societies, and has been a key topic in demographic research. However, our understanding of the demographic transition in Korea is limited, largely due to a lack of adequate data. By using individual longitudinal data drawn from the population registers in a rural Korean village between 1920 and 1977, we attempt to contribute to this literature. We first discuss conceptual and data issues, and the historical context. We then test a key exposition of demographic transition theory: an improvement in child survival was a prerequisite for fertility decline. We find that: (1) an improvement in child survival was crucial for marital fertility changes across birth cohorts; (2) the relationship between child survival and marital fertility remained stable; (3) parity-specific fertility control emerged early and birth spacing became important later as ways of limiting marital fertility; and (4) the sex of the deceased offspring became important for marital fertility. The implications of these findings for the Korean demographic transition and future study topics are discussed.     

Rural migration in Korea: a transition to the modern era

Because industrialization and modernization have been stressed as characteristics of an advanced society, pre-industrial and early industrial societies have often been depicted as sedentary and stable in the literature on migration; however, findings have begun to appear that question such depictions. In this paper, we examine the migration patterns of the rural Korean population during Japanese colonial rule (1910–1945), the period immediately preceding full-scale industrialization. In order to determine whether the population can be characterized as mobile or sedentary, we examine patterns of geographic mobility in association with migration distances and in association with migrants' ages. Our results suggest that during this era, as Korea headed down the road to modernity, individual movements followed mixed migration patterns. Specifically, migration in Korea prior to modernization exhibited both a stable-oriented pattern and a life-at-stake-oriented pattern. These findings confirm the context-specific diversity of migration processes across different societies and historical periods.     

Using cadastral maps in historical demographic research: Some examples from the Netherlands

Historical cadastral maps can be a very useful additional source in historical demographic research. As an increasing range of geospatial data and tools have become available to researchers, it becomes easier to combine, link and analyse historical micro level demographic data within a small-scale spatial context. This study shows some examples of linked cadastral map data, population census data, and population register data of the Dutch city of Leeuwarden halfway the nineteenth century. The spatial methods and techniques used vary from relatively easy visualisation in maps and basic spatial statistics to more advanced spatial modelling.     

Surnames: History of the family and history of populations

A meeting on surnames was recently held in Lyons, gathering searchers from different scientific horizons such as sociology, history, anthropology, demography and population genetics. We selected the six following papers because of their major interest to history of the family and history of populations. Surnames appear as an important and convenient tool for the study of marriage patterns or of geographical mobility. We also provide some general comments about the different uses of surnames in the current works in the field of historical demography and population genetics. We also mention some examples revealing the social significance of surnames in some specific historical context.     

Surnames

A meeting on surnames was recently held in Lyons, gathering searchers from different scientific horizons such as sociology, history, anthropology, demography and population genetics. We selected the six following papers because of their major interest to history of the family and history of populations. Surnames appear as an important and convenient tool for the study of marriage patterns or of geographical mobility. We also provide some general comments about the different uses of surnames in the current works in the field of historical demography and population genetics. We also mention some examples revealing the social significance of surnames in some specific historical context.     

The effect of social status on women's age at first childbirth in the late seventeenth- to early eighteenth-century Korea

While records on historical population are available and do exist, the fact that they are so limited in nature is a critical problem. We applied the method of family reconstitution to a Korean household register to deal with these limitations. Based on family reconstitution from five successive registers, we calculated women's age at first childbirth for each social status in two ways: “observed woman's age” at first childbirth = woman's current age–age of her first child, and “estimated woman's age” at first childbirth, which uses linear regression analysis on the basis of positive association between women's age and the age of their firstborn. Our results shed light on the effects of social status and cultural factors on the age at which women in pre-industrial Korea bore their first child.     

The effect of social status on women's age at first childbirth in the late seventeenth- to early eighteenth-century Korea

While records on historical population are available and do exist, the fact that they are so limited in nature is a critical problem. We applied the method of family reconstitution to a Korean household register to deal with these limitations. Based on family reconstitution from five successive registers, we calculated women's age at first childbirth for each social status in two ways: “observed woman's age” at first childbirth = woman's current age–age of her first child, and “estimated woman's age” at first childbirth, which uses linear regression analysis on the basis of positive association between women's age and the age of their firstborn. Our results shed light on the effects of social status and cultural factors on the age at which women in pre-industrial Korea bore their first child.     

Classification of the Y-haplogroup distributions of Western Eurasian populations using a self-learning algorithm

The understanding of historical relationship between populations is a core aspect of human population history studies. We have compared the frequency of 18 different Y-SNP haplogroups in 90 Western Eurasian populations. Classification of haplogroup distribution vectors using a new self-learning classification algorithm so called “self-organizing cloud (SOC)” proved to be an effective tool to identify population groups, which share common paternal genetic features. By means of the algorithm, we have determined 10 different classes of populations based on the similarity of haplogroup composition. The analysis showed that paternal genetic markers tend to reflect geographical proximity of populations better than linguistic relationship, although certain Y-SNP haplogroups have relatively good correlation with specific language families. These observations are based on the comparative analysis of the Hg distributions of contemporary populations may reflect demographic history of them in the past.     

Identification of document paper using hybrid feature extraction

Document forgery is a significant issue in Korea, with around ten thousand cases reported every year. Analyzing paper plays a crucial role in examining questionable documents such as marketable securities and contracts, which can aid in solving criminal cases of document forgery. Paper analysis can also provide essential insights in other types of criminal cases, serving as an important clue for solving cases such as the source of a blackmail letter. The papermaking process generates distinct forming fabric marks and formations, which are critical features for paper classification. These characteristics are observable under transmitted light and are created by the forming fabric pattern and the distribution of pulp fibers, respectively. In this study, we propose a novel approach for paper identification based on hybrid features. This method combines texture features extracted from images converted using the gray-level co-occurrence matrix (GLCM) approach and a convolutional neural network (CNN), with another set of features extracted by the CNN using the same images as input. We applied the proposed method to classification tasks for seven major paper brands available in the Korean market, achieving an accuracy of 97.66%. The results confirm the applicability of this method for visually inspecting paper products and demonstrate its potential for assisting in solving criminal cases involving document forgery.     

Organizational Climate, Perceived Citizen Support, and Job Satisfaction of Police Officers: Findings from the Post-Grand Reform Era in South Korea

Two major police reforms were introduced in South Korea in 1991 and 1999 to help bring about a shift from a colonial style of policing to a form more prevalent in developed economies pursuing the rule of law, observance of human rights, and the practice of democratic policing. We conclude that the findings from the present study, drawing on a survey of a national sample of 406 South Korean police officers, offer modest support for the efforts of the Grand Reform in its impact on police officers?? satisfaction with promotion and salary and benefits. While few demographic characteristics, with the exception of age and years of experience, were associated with job satisfaction, there is strong evidence for the relationship between organizational characteristics and job satisfaction. Management support and perceived citizen support of police are associated with both measures of satisfaction, promotion and salary/benefits, while the police officers?? relationship with their supervisors is less than stellar. Finally, officers who believe that the primary operating philosophy of the police is to serve the government appear to be satisfied with their jobs relative to their opportunity for promotion, which is perhaps a more critical measure for them than salary and benefits, reflecting the presence of a police organizational climate that is still rooted in the historical military culture of Korean police. The findings from this study suggest that more efforts are warranted in improving organizational climate if officers are to believe their primary goal is to serve the citizen, a fundamental element of democratic policing.     

Inferring ethnicity using 15 autosomal STR loci—Comparisons among populations of similar and distinctly different physical traits

The forensic utility of short tandem repeat (STR) polymorphisms for ethnic inference (EI) has recently received limited attention from the research community. The large volume of population specific STR data available from public literature affords us the opportunity to assess the reliability of EIs based on STR profiles, and present significant results. We applied a binary Bayesian approach using 15 autosomal STR loci from computer-simulated and real STR profiles of Han Chinese, Japanese, Korean, American Caucasian, and a South Asian Indian aboriginal tribal group called Lodha. A correct classification rate of ≥90% was achieved via simulation for each East Asian group (Han Chinese, Japanese, and Korean) when paired with the American Caucasian or the tribal Indian group. Similar result was obtained between the Caucasian and the Indian group, while the correct classification rates among the three East Asian groups were much lower (70%). Results based on real profiles closely matched those achieved via simulation, establishing the credibility of our classifier performance metrics. This study shows that binary Bayesian classifier performed best for ethnic groups with distinctly different physical traits. This observation might be due to accidental differences caused by bottlenecks, genetic drift, etc. However, it could also be taken as an indication that STRs, commonly referred to as “junk” DNA, may have an effect on phenotype, a possibility that warrants further research.     

韩国老年人福利法的变迁及对我国的启示

人口老龄化问题在发达国家早已为人所熟知,进入21世纪,一些发展中国家也开始进入老龄化行列之中,而同属东亚的韩国和我国在很多方面,有着惊人的相似之处,在人口老龄化问题上也不例外。由于两国的老龄化进程相对较快,使得两国在应对老龄化问题上面临了新的挑战。自上世纪60年代后,韩国老年人福利法制的发展与完善对我国相关法制的建立提供了可以借鉴的经验和启示。     

Prototypicality analysis of the Comprehensive Assessment of Psychopathic Personality (CAPP): A cross-cultural perspective

The Comprehensive Assessment of Psychopathic Personality (CAPP) model is a new lexically based concept of psychopathy that has potential clinical utility. The main purpose of this research is to investigate the generalizability of the CAPP conceptual model in South Korea. In the current study, 88 experts and 1727 laypeople in South Korea were asked to evaluate the prototypicality of the symptoms of psychopathy (CAPP items) by using a Korean translation of the CAPP model (K-CAPP). In addition, 11 international prototypicality studies were systematically compared to the ratings by experts in the present study. As a result, it indicated that Korean experts and laypeople, on average, rated K-CAPP symptoms as moderately to highly prototypical of psychopathy, and more prototypical of psychopathy than symptoms theoretically unrelated to psychopathy (foils). Also, prototypicality ratings of K-CAPP symptoms made by those two groups were similar to each other as well as to ratings by experts and laypeople using the CAPP in other 11 countries. In conclusion, these results clearly show that both experts and laypeople in the current study conceptualized PPD in almost the same way as experts and laypeople from previous studies using the CAPP model.     

Forensic genetic analysis of mitochondrial DNA hypervariable region I/II sequences: an expanded Korean population database

We have analyzed variation of the mitochondrial DNA (mtDNA) hypervariable segments I and II (HVS-I and HVS-II) in 185 randomly chosen individuals from Korea to provide an expanded and reliable Korean database. Combined sequence comparison of HVS-I and HVS-II led to the identification of 167 different haplotypes characterized by 154 variable sites. One hundred and fifty-one of the haplotypes were individual-specific, 14 were found in two individuals and 2 were found in three individuals. A pairwise comparison of the 185 HVS-I/II sequences found an average of 10.11 +/- 4.63 differences between individuals. The random match probability and gene diversity for the combined hypervariable regions were estimated at 0.66% and 0.9988, respectively. Analyzing the expanded database including three previously reported data sets and the present data using haplogroup-based comparisons and comparison with closely related sequences allowed errors to be detected and eliminated, thus considerably improving data quality. Sample division comparisons based on PhiST genetic distance measures revealed no significant population differentiation in the distribution of mtDNA sequence variations between the present data set and a database in The Scientific Working Group on DNA Analysis Methods (SWGDAM), but did indicate differences from other sets of data. Based on the results of mtDNA profiles, almost all of the mtDNA types studied here could be classified into subsets of haplogroups common in east Asia, and show that the Koreans possess lineages from both the southern and the northern haplogroup complexes of east Asian populations. The new data, combined with other mtDNA sequences, demonstrate how useful comparison with closely related mtDNA sequences can be for improving database quality, as well as providing haplotype information for forensic and population genetic analyses in the Korean population.     

Wealth stratification and reproduction in Northeast China, 1866–1907

Although the importance of material wealth to population growth is the core of Malthusian theory about population dynamics in pre-transitional societies, our understanding of the relationship between wealth and reproductive success in China is still limited. Until recently, there was little in the way of relevant data. In the absence of empirical evidence to the contrary, conceptions of the Chinese demographic regime were largely Malthusian, in that they did not account for the possible role of a fertility-based preventive check. In this study, we examine wealth differentials in reproduction in historical rural China by using newly available longitudinal individual level demographic and household level land holding data for 108,100 immigrants and their descendants living in 120 villages in Shuangcheng, Northeast China, between 1866 and 1907. Our study demonstrates a positive correlation between land holding status and marital fertility among the population under study. In addition, there is also a clear pattern of fertility differentials according to household context and other measures of socioeconomic status. Our findings suggest that these fertility differentials are not only results of certain social institutions and customs but also the consequences of couple's behavior of fertility control in response to socioeconomic and other household conditions.     

Assessing the correctional orientation of corrections officers in South Korea

The correctional goal in South Korea has recently changed from the straightforward punishment of inmates to rehabilitation. Currently, emphases are being placed on education, counseling, and other treatment programs. These changes have consequently begun to also change the corrections officers' roles from a purely custodial role to a human service role, in which officers are expected to manage rehabilitation and treatment programs. Despite these changes, few studies have examined the attitudes of corrections officers toward rehabilitation programming. This is an important dimension to examine in rehabilitation programming, as corrections officers play a major role in the delivery of institutional programs. This study examines the attitudes of South Korean corrections officers toward rehabilitation programs. Approximately 430 corrections officers were sampled. Results show that correctional attitudes are largely influenced by not only officers' own motivations for joining corrections but also by institutional factors such as job stress. Policy implications are discussed.     

Molecular characterisation and population genetics of the DYS458 .2 allelic variant

We recently found a number of intermediate DYS458 alleles, indicated as .2. This allelic variant is distributed in several populations, but currently no information is available regarding the molecular structure and the genealogical correlation of chromosomes with this variant. The molecular characterisation of such allele, its worldwide distribution and the correlated evolutionary history are the subject of the present paper. Molecular and genealogical data are suggestive of a single origin for the .2 variant. Phylogeographic analysis points to either a Middle East or East African origin, but additional data is necessary to clarify this point. Our results suggest that the .2 variants is a stable polymorphism and that it could be used for population studies.     

Criminal victimization in South Korea: A multilevel approach

A growing number of studies in criminal victimization had integrated the individual model and the context model to examine the dynamics of influences from the predictors at different levels. Only a few studies, however, had explored the impact of multilevel factors upon criminal victimization outside the U.S. context. Using the survey data gathered in Seoul, South Korea, the current study tested the applicability of the multilevel approach in criminal victimization to the Korean context. The results were mixed. At the macro level, poverty and community cohesion were positively associated with victimization by street crime and residential crime, respectively. Inconsistent with the findings in the U.S. studies, however, community cohesion increased the chance of residential crime victimization, and residential mobility was not significantly associated with criminal victimization. At the micro level, avoidance behaviors and target hardening efforts were associated with more criminal victimization, contrary to the proposition by opportunity theory. These unexpected findings could be explained by the unique social and cultural characteristics of Korean society. The unique contexts of modern Korean society as well as the limitation of the current study are discussed.