Xiaojun Hu - Academia.edu (original) (raw)

Papers by Xiaojun Hu

Research paper thumbnail of Hibernators, their awakeners and the roles of subsequent authoritative citers

Malaysian Journal of Library & Information Science, 2018

Research paper thumbnail of A comparative study of the difference in research performance in biomedical fields among selected Western and Asian countries

Scientometrics, 2009

In this study, a series of relative indicators are used to compare the difference in research per... more In this study, a series of relative indicators are used to compare the difference in research performance in biomedical fields between ten selected Western and Asian countries. Based on Thomson's Essential Science Indicators (ESI) 1996-2006, the output of papers and their citations in ten biomedical fields are compared at multiple levels using relative indicators. Chart diagrams and hierarchical clustering are applied to represent the data. The results confirm that there are many differences in intra-and interdisciplinary scientific activities between the West and the East. In most biomedical fields Asian countries perform below world average.

Research paper thumbnail of An outgrow index

Proposes a relative index measuring the amount by which an article outgrows, in terms of citation... more Proposes a relative index measuring the amount by which an article outgrows, in terms of citations, the publications on which it is based. The study involves citations collected from Web of Science during the last week of April 2010 along with the number of citations received (also in WoS) by each of the references.

Research paper thumbnail of A simple approach to describe a company’s innovative activities and their technological breadth

Scientometrics, 2014

ABSTRACT Technological breadth, as an indicator of knowledge integration, and breadth of technolo... more ABSTRACT Technological breadth, as an indicator of knowledge integration, and breadth of technological diffusion are two sides of a coin when studying the value of patents. In this contribution some h-type indices are developed, and applications in the field of technological innovation are provided. The obtained results suggest that these h-type indices can be used to describe two-dimensions of a firm’s vitality with respect to technological innovation and technological breadth of patents. Hence, patent-related h-indices can serve as simple alternative indicators to describe a firm’s performance in technological innovation. They can, moreover, be used to compare firms active in the same industry.

Research paper thumbnail of Structural indicators in citation networks

Research paper thumbnail of Synthetic biology: From a word to a world

Research paper thumbnail of Metrics: a fetish for high-profile journals

Research paper thumbnail of A new approach for measuring the value of patents based on structural indicators for ego patent citation networks

Journal of the American Society for Information Science and Technology, 2012

Research paper thumbnail of On the definition of forward and backward citation generations

Journal of Informetrics, 2011

A publication exerts direct and indirect influence on other articles (by citing articles and by a... more A publication exerts direct and indirect influence on other articles (by citing articles and by articles that cite citing articles) and is itself influenced directly as well as indirectly (by references and references of references). This citation network leads to generations of citing and cited publications. In this contribution we show that these generations can be defined in different ways.

Research paper thumbnail of Time series of outgrow indices

Journal of Informetrics, 2011

Research paper thumbnail of Two time series, their meaning and some applications

Journal of Informetrics, 2013

ABSTRACT Introducing and studying two types of time series, referred to as R1 and R2, we try to e... more ABSTRACT Introducing and studying two types of time series, referred to as R1 and R2, we try to enrich the set of time series available for time dependent informetric studies. In a first part we focus on mathematical properties, while in a second part we check if these properties are visible in real data. This practical application uses data in the social sciences related to top Chinese universities. R1 sequences always increase over time, tending relatively fast to one, while R2 sequences have a decreasing tendency tending to zero in practical cases. They can best be used over relatively short periods of time. R1 sequences can be used to detect the rate with which cumulative data increase, while R2 sequences detect the relative rate of development.The article ends by pointing out that these time series can be used to compare innovative activities in firms. Clearly, this investigation is just a first attempt. More studies are needed, including comparisons with other related sequences.

Research paper thumbnail of In those fields where multiple authorship is the rule, the h-index should be supplemented by role-based h-indices

Journal of Information Science, 2009

Collaboration patterns among scientists are becoming more and more complicated. Even sophisticate... more Collaboration patterns among scientists are becoming more and more complicated. Even sophisticated methods for taking the number of co-authors into account do not solve all problems related to the calculation of citation measures such as the h -index. In this article we introduce role-based h-indices and in particular the major contribution h-index, denoted as h-maj, which takes only those articles into account in which the scientist plays a major or core role. As an example we provide major contribution indices for scientists in the health sciences in China. Differences between the h-index and h-maj are shown for data based on the Web of Science (WoS), and separately, based on the China National Knowledge Infrastructure (CNKI) database. It is suggested to use the major contribution h-index as a supplementary index, especially in those fields where multiple ‘first authors’ and/or corresponding authors are common.

Research paper thumbnail of Describing the development of molecular research in the context of nervous system diseases using year-based h-cores

Journal of Information Science, 2013

This article introduces year-based h-indices as a tool to produce easy-to-use research overviews.... more This article introduces year-based h-indices as a tool to produce easy-to-use research overviews. Based on PubMed data, a general framework is constructed to study the development of molecular research in the context of nervous system diseases. It is shown which molecular substances are the centre of attention and which have passed their peak. Year-based h-indices have the following interesting features for representing changes in a field or discipline: flexibility, sensitivity to dynamic changes, fluctuation detection and trend detection.

Research paper thumbnail of From a word to a world: the current situation in the interdisciplinary field of synthetic biology

PeerJ, 2015

Using a carefully designed search query, we describe the field of synthetic biology in terms of l... more Using a carefully designed search query, we describe the field of synthetic biology in terms of leading countries, organizations and funding sources. Besides articles we also paid some attention to patents. The USA is the leading country in this field, followed by China. There is a clear exponential growth in the field of synthetic biology over the latest 14 years. Keywords were analyzed using the notion of year-based h-indices, core gap and relative core gap. We conclude that the term "synthetic biology" hides a large world ready to be explored by interdisciplinary research.

Research paper thumbnail of Time series of outgrow indices

JOURNAL OF INFORMETRICS, 2011

The outgrow index measures to which extent an article outgrows -in terms of citations -the refere... more The outgrow index measures to which extent an article outgrows -in terms of citations -the references on which it is based. In this article, three types of time series of outgrow indices and one outgrow index matrix are introduced. Examples of these time series are given illustrating the newly introduced concepts. These time series expand the toolbox for citation analysis by focusing on a specific subnetwork of the global citation network. It is stated that citation analysis has three application areas: information retrieval, research evaluation and structural citation network studies. This contribution is explicitly placed among structural network studies.

Research paper thumbnail of Hibernators, their awakeners and the roles of subsequent authoritative citers

Malaysian Journal of Library & Information Science, 2018

Research paper thumbnail of A comparative study of the difference in research performance in biomedical fields among selected Western and Asian countries

Scientometrics, 2009

In this study, a series of relative indicators are used to compare the difference in research per... more In this study, a series of relative indicators are used to compare the difference in research performance in biomedical fields between ten selected Western and Asian countries. Based on Thomson's Essential Science Indicators (ESI) 1996-2006, the output of papers and their citations in ten biomedical fields are compared at multiple levels using relative indicators. Chart diagrams and hierarchical clustering are applied to represent the data. The results confirm that there are many differences in intra-and interdisciplinary scientific activities between the West and the East. In most biomedical fields Asian countries perform below world average.

Research paper thumbnail of An outgrow index

Proposes a relative index measuring the amount by which an article outgrows, in terms of citation... more Proposes a relative index measuring the amount by which an article outgrows, in terms of citations, the publications on which it is based. The study involves citations collected from Web of Science during the last week of April 2010 along with the number of citations received (also in WoS) by each of the references.

Research paper thumbnail of A simple approach to describe a company’s innovative activities and their technological breadth

Scientometrics, 2014

ABSTRACT Technological breadth, as an indicator of knowledge integration, and breadth of technolo... more ABSTRACT Technological breadth, as an indicator of knowledge integration, and breadth of technological diffusion are two sides of a coin when studying the value of patents. In this contribution some h-type indices are developed, and applications in the field of technological innovation are provided. The obtained results suggest that these h-type indices can be used to describe two-dimensions of a firm’s vitality with respect to technological innovation and technological breadth of patents. Hence, patent-related h-indices can serve as simple alternative indicators to describe a firm’s performance in technological innovation. They can, moreover, be used to compare firms active in the same industry.

Research paper thumbnail of Structural indicators in citation networks

Research paper thumbnail of Synthetic biology: From a word to a world

Research paper thumbnail of Metrics: a fetish for high-profile journals

Research paper thumbnail of A new approach for measuring the value of patents based on structural indicators for ego patent citation networks

Journal of the American Society for Information Science and Technology, 2012

Research paper thumbnail of On the definition of forward and backward citation generations

Journal of Informetrics, 2011

A publication exerts direct and indirect influence on other articles (by citing articles and by a... more A publication exerts direct and indirect influence on other articles (by citing articles and by articles that cite citing articles) and is itself influenced directly as well as indirectly (by references and references of references). This citation network leads to generations of citing and cited publications. In this contribution we show that these generations can be defined in different ways.

Research paper thumbnail of Time series of outgrow indices

Journal of Informetrics, 2011

Research paper thumbnail of Two time series, their meaning and some applications

Journal of Informetrics, 2013

ABSTRACT Introducing and studying two types of time series, referred to as R1 and R2, we try to e... more ABSTRACT Introducing and studying two types of time series, referred to as R1 and R2, we try to enrich the set of time series available for time dependent informetric studies. In a first part we focus on mathematical properties, while in a second part we check if these properties are visible in real data. This practical application uses data in the social sciences related to top Chinese universities. R1 sequences always increase over time, tending relatively fast to one, while R2 sequences have a decreasing tendency tending to zero in practical cases. They can best be used over relatively short periods of time. R1 sequences can be used to detect the rate with which cumulative data increase, while R2 sequences detect the relative rate of development.The article ends by pointing out that these time series can be used to compare innovative activities in firms. Clearly, this investigation is just a first attempt. More studies are needed, including comparisons with other related sequences.

Research paper thumbnail of In those fields where multiple authorship is the rule, the h-index should be supplemented by role-based h-indices

Journal of Information Science, 2009

Collaboration patterns among scientists are becoming more and more complicated. Even sophisticate... more Collaboration patterns among scientists are becoming more and more complicated. Even sophisticated methods for taking the number of co-authors into account do not solve all problems related to the calculation of citation measures such as the h -index. In this article we introduce role-based h-indices and in particular the major contribution h-index, denoted as h-maj, which takes only those articles into account in which the scientist plays a major or core role. As an example we provide major contribution indices for scientists in the health sciences in China. Differences between the h-index and h-maj are shown for data based on the Web of Science (WoS), and separately, based on the China National Knowledge Infrastructure (CNKI) database. It is suggested to use the major contribution h-index as a supplementary index, especially in those fields where multiple ‘first authors’ and/or corresponding authors are common.

Research paper thumbnail of Describing the development of molecular research in the context of nervous system diseases using year-based h-cores

Journal of Information Science, 2013

This article introduces year-based h-indices as a tool to produce easy-to-use research overviews.... more This article introduces year-based h-indices as a tool to produce easy-to-use research overviews. Based on PubMed data, a general framework is constructed to study the development of molecular research in the context of nervous system diseases. It is shown which molecular substances are the centre of attention and which have passed their peak. Year-based h-indices have the following interesting features for representing changes in a field or discipline: flexibility, sensitivity to dynamic changes, fluctuation detection and trend detection.

Research paper thumbnail of From a word to a world: the current situation in the interdisciplinary field of synthetic biology

PeerJ, 2015

Using a carefully designed search query, we describe the field of synthetic biology in terms of l... more Using a carefully designed search query, we describe the field of synthetic biology in terms of leading countries, organizations and funding sources. Besides articles we also paid some attention to patents. The USA is the leading country in this field, followed by China. There is a clear exponential growth in the field of synthetic biology over the latest 14 years. Keywords were analyzed using the notion of year-based h-indices, core gap and relative core gap. We conclude that the term "synthetic biology" hides a large world ready to be explored by interdisciplinary research.

Research paper thumbnail of Time series of outgrow indices

JOURNAL OF INFORMETRICS, 2011

The outgrow index measures to which extent an article outgrows -in terms of citations -the refere... more The outgrow index measures to which extent an article outgrows -in terms of citations -the references on which it is based. In this article, three types of time series of outgrow indices and one outgrow index matrix are introduced. Examples of these time series are given illustrating the newly introduced concepts. These time series expand the toolbox for citation analysis by focusing on a specific subnetwork of the global citation network. It is stated that citation analysis has three application areas: information retrieval, research evaluation and structural citation network studies. This contribution is explicitly placed among structural network studies.