Ja Kyung Koo

408 total citations
57 papers, 203 citations indexed

About

Ja Kyung Koo is a scholar working on Geometry and Topology, Algebra and Number Theory and Mathematical Physics. According to data from OpenAlex, Ja Kyung Koo has authored 57 papers receiving a total of 203 indexed citations (citations by other indexed papers that have themselves been cited), including 38 papers in Geometry and Topology, 35 papers in Algebra and Number Theory and 23 papers in Mathematical Physics. Recurrent topics in Ja Kyung Koo's work include Algebraic Geometry and Number Theory (31 papers), Advanced Algebra and Geometry (21 papers) and Analytic Number Theory Research (21 papers). Ja Kyung Koo is often cited by papers focused on Algebraic Geometry and Number Theory (31 papers), Advanced Algebra and Geometry (21 papers) and Analytic Number Theory Research (21 papers). Ja Kyung Koo collaborates with scholars based in South Korea, Russia and Canada. Ja Kyung Koo's co-authors include Daeyeoul Kim, Chang Heon Kim, Freydoon Shahidi, Jae Hoon Cho, So Young Choi, Young Min Park, Byeong-Kweon Oh, Min Ju Kang, Mi‐Yeon Kim and Hoon Kang and has published in prestigious journals such as SHILAP Revista de lepidopterología, Mathematics of Computation and Journal of Mathematical Analysis and Applications.

In The Last Decade

Ja Kyung Koo

50 papers receiving 178 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Ja Kyung Koo South Korea	8	143	127	79	38	24	57	203
Kurt Girstmair Austria	9	140 1.0×	132 1.0×	69 0.9×	45 1.2×	50 2.1×	58	221
Herbert Gangl United Kingdom	8	97 0.7×	104 0.8×	78 1.0×	68 1.8×	17 0.7×	19	187
Roberto Dvornicich Italy	8	159 1.1×	78 0.6×	85 1.1×	49 1.3×	36 1.5×	37	199
Matilde Laĺın Canada	7	100 0.7×	111 0.9×	89 1.1×	57 1.5×	28 1.2×	42	170
Edward Dobrowolski Canada	5	156 1.1×	99 0.8×	81 1.0×	51 1.3×	55 2.3×	14	238
Ivan Fesenko United Kingdom	7	231 1.6×	100 0.8×	164 2.1×	41 1.1×	68 2.8×	31	293
Masato Kurihara Japan	12	270 1.9×	119 0.9×	222 2.8×	33 0.9×	20 0.8×	25	293
Árpád Tóth Hungary	10	93 0.7×	143 1.1×	137 1.7×	28 0.7×	6 0.3×	24	217
Luís Dieulefait Spain	8	183 1.3×	77 0.6×	164 2.1×	30 0.8×	30 1.3×	43	215
Lenny Jones United States	9	154 1.1×	90 0.7×	50 0.6×	59 1.6×	58 2.4×	62	225

Countries citing papers authored by Ja Kyung Koo

Since Specialization

Citations

This map shows the geographic impact of Ja Kyung Koo's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ja Kyung Koo with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ja Kyung Koo more than expected).

Fields of papers citing papers by Ja Kyung Koo

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ja Kyung Koo. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ja Kyung Koo. The network helps show where Ja Kyung Koo may publish in the future.

Co-authorship network of co-authors of Ja Kyung Koo

This figure shows the co-authorship network connecting the top 25 collaborators of Ja Kyung Koo. A scholar is included among the top collaborators of Ja Kyung Koo based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Ja Kyung Koo. Ja Kyung Koo is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Koo, Ja Kyung, et al.. (2025). Class fields and form class groups for solving certain quadratic Diophantine equations. Journal of Number Theory. 275. 1–34.

Koo, Ja Kyung, et al.. (2019). On a problem of Hasse and Ramachandra. SHILAP Revista de lepidopterología. 2 indexed citations

Koo, Ja Kyung, et al.. (2018). Generation of ray class fields modulo 2, 3, 4 or 6 by using the Weber function. Journal of the Korean Mathematical Society. 55(2). 343–372. 3 indexed citations

Koo, Ja Kyung, et al.. (2018). Primitive and totally primitive Fricke families with applications (II). Journal of Mathematical Analysis and Applications. 472(1). 432–446. 1 indexed citations

Koo, Ja Kyung, et al.. (2016). Primitive and Totally Primitive Fricke Families with Applications. Results in Mathematics. 71(3-4). 841–858. 4 indexed citations

Koo, Ja Kyung, et al.. (2011). Ray class invariants over imaginary quadratic fields. Tohoku Mathematical Journal. 63(3). 5 indexed citations

Kim, Daeyeoul, et al.. (2010). Divisor functions arising from $q$-series. Publicationes Mathematicae Debrecen. 76(4). 495–508. 5 indexed citations

Koo, Ja Kyung, et al.. (2009). Generation of ray class fields by elliptic units. Bulletin of the London Mathematical Society. 41(5). 935–942. 1 indexed citations

Kang, Min Ju, Jae Hoon Cho, Ja Kyung Koo, et al.. (2009). The Expression of NMDA Receptor 1 Correlates with Clinicopathological Parameters in Cutaneous Squamous Cell Carcinoma. Annals of Dermatology. 21(4). 382–382. 8 indexed citations

10.

Koo, Ja Kyung, et al.. (2008). On some arithmetic properties of Siegel functions. Mathematische Zeitschrift. 264(1). 137–177. 17 indexed citations

11.

Koo, Ja Kyung, et al.. (2008). Arithmetic of the Ramanujan–Göllnitz–Gordon continued fraction. Journal of Number Theory. 129(4). 922–947. 22 indexed citations

12.

Choi, So Young & Ja Kyung Koo. (2007). Estimation of genus of arithmetic curves and applications. The Ramanujan Journal. 15(1). 1–17. 1 indexed citations

13.

Park, Young Min, Ja Kyung Koo, Mi Yeon Kim, et al.. (2006). Espression of Toll-like Receptor 4 on Human Keratinocytes by Lipoteichoic Acid. Linchuang pifuke zazhi. 44(1). 15–21. 1 indexed citations

14.

Kim, Chang Heon & Ja Kyung Koo. (2005). More on super-replication formulae. Journal of Algebra. 290(2). 295–321. 1 indexed citations

15.

Choi, So Young & Ja Kyung Koo. (2005). CLASS FIELDS FROM THE FUNDAMENTAL THOMPSON SERIES OF LEVEL N = o(g). Journal of the Korean Mathematical Society. 42(2). 203–222. 1 indexed citations

16.

Kim, Chang Heon & Ja Kyung Koo. (2004). Estimation of Genus for Certain Arithmetic Groups. Communications in Algebra. 32(7). 2479–2495. 2 indexed citations

17.

Koo, Ja Kyung, et al.. (2002). Self-recursion formulas of certain monstrous functions. Journal of Pure and Applied Algebra. 171(1). 27–40. 1 indexed citations

18.

Koo, Ja Kyung, et al.. (2001). Self-recursion formulas satisfied by Fourier coefficients of some modular functions. Journal of Pure and Applied Algebra. 160(1). 53–65. 6 indexed citations

19.

Kim, Daeyeoul & Ja Kyung Koo. (2001). Algebraic integers as values of elliptic functions. Acta Arithmetica. 100(2). 105–116. 8 indexed citations

20.

Koo, Ja Kyung, et al.. (2000). The normalizer of γ₁(N) in psl₂(R). Communications in Algebra. 28(11). 5303–5310. 3 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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