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Khophloiklang V, Chanapiwat P, Kaeoket K. Camellia oil with its rich in fatty acids enhances post-thawed boar sperm quality. Acta Vet Scand 2024; 66:6. [PMID: 38347642 PMCID: PMC10863207 DOI: 10.1186/s13028-024-00728-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 02/09/2024] [Indexed: 02/15/2024] Open
Abstract
BACKGROUND Boar sperm are highly susceptible to specific conditions during cryopreservation, leading to a significant decrease in their fertilizing potential due to damage to their membranes. Camellia oil, known for its fatty acids with antioxidant and biological properties, has not been previously explored for the cryopreservation of boar semen. This study aimed to examine the effects of camellia oil on post-thawed boar sperm quality. Boar semen ejaculates (n = 9) were collected and divided into six equal aliquots based on camellia oil concentrations (0, 0.5, 1, 1.5, 2 and 2.5% v/v) in the freezing extender. Semen samples were processed and cryopreserved using the liquid nitrogen vapor method. Thereafter, frozen semen samples were thawed at 50 °C for 12 s and evaluated for sperm morphology by scanning electron microscope, sperm motility using a computer-assisted sperm analyzer, sperm viability, acrosome integrity, mitochondrial function, MDA level and total antioxidant capacity. RESULTS The results demonstrated that the supplementation of 1.5% (v/v) camellia oil showed superior post-thaw sperm qualities such as improved sperm morphology, motility, acrosome integrity and mitochondrial function by 14.3%, 14.3% and 11.7%, respectively, when compared to the control group. Camellia oil at a concentration of 1.5% (v/v) showed the lowest level of MDA (18.3 ± 2.1 µmol/L) compared to the other groups. CONCLUSIONS In conclusion, adding 1.5% (v/v) camellia oil in the freezing extender reduced the oxidative damage associated with cryopreservation and resulted in a higher post-thawed sperm quality.
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Affiliation(s)
- Vassakorn Khophloiklang
- Semen Laboratory, Department of Clinical Sciences and Public Health, Faculty of Veterinary Science, Mahidol University, Phutthamonthon, Nakhon Pathom, 73170, Thailand
- Faculty of Veterinary Science, Rajamangala University of Technology Srivijaya, Thungyai, Nakhon Si Thammarat, 80240, Thailand
| | - Panida Chanapiwat
- Semen Laboratory, Department of Clinical Sciences and Public Health, Faculty of Veterinary Science, Mahidol University, Phutthamonthon, Nakhon Pathom, 73170, Thailand
| | - Kampon Kaeoket
- Semen Laboratory, Department of Clinical Sciences and Public Health, Faculty of Veterinary Science, Mahidol University, Phutthamonthon, Nakhon Pathom, 73170, Thailand.
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González D, Rojas M, Rojano B, Restrepo G. Low-density lipoproteins, resveratrol and quercetin as alternative additives to improve boar semen cooling. Reprod Domest Anim 2023; 58:1420-1427. [PMID: 37587646 DOI: 10.1111/rda.14457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/28/2023] [Accepted: 08/06/2023] [Indexed: 08/18/2023]
Abstract
Low-density lipoproteins (LDL), quercetin (Q) and resveratrol (R) have been used for sperm preservation to improve sperm quality in different species. To evaluate the effects of LDL, Q and R during the cooling of boar semen. Fifteen boar semen samples were diluted in a BTS extender supplemented with the treatments: LDL at 6%, Q at 10 μM (Q10), 30 μM (Q30) and 50 μM (Q50), or R at 10 μM (R10), 30 μM (R30) and 50 μM. A control without supplementation was included. The semen was stored by cooling at 16°C for 96 h. Every 24 h, sperm motility and kinetics were evaluated using a computer-assisted sperm analyzer (IVOS). At 24 and 96 h of cooling, functional membrane integrity and mitochondrial membrane potential (ΔΨM) of sperm were evaluated by the hypoosmotic swelling test (HOST) an flow cytometry with JC-1 probe, respectively, LDL improved progressive motility of sperm during cooling. Likewise, LDL increased average path velocity (VAP) and straight-line velocity (VSL) and/or curvilinear velocity (VCL) during the first 48 h of cooling. The use of Q between 10 and 30 μM caused a reduction in total motility, progressive motility and amplitude of the lateral head displacement during the entire cooling period, as well as a decrease in VAP, VSL and VCL at 96 h of cooling. LDL, Q10, Q30 and Q50 modulated mitochondrial activity by reducing high-ΔΨM sperm at 0 and 96 h of cooling. During the cooling of the boar semen prior to artificial insemination, the parameters of sperm quality that could influence fertility decrease; however, the inclusion of antioxidants and additives that protect the plasma membrane, such as LDL, could mitigate the damaging effects on spermatozoa. It is concluded that LDL can improve the motility and kinetics of boar semen during cooling while it could modulating the sperm's mitochondrial activity. On the contrary, Q could alter the motility and kinetics of boar sperm during the cooling period.
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Affiliation(s)
- Darío González
- Faculty of Sciences, Universidad Nacional de Colombia, Medellín, Colombia
| | - Mauricio Rojas
- Faculty of Medicine, Cell Immunology and Immunogenetics Group, Universidad de Antioquia, Medellín, Colombia
- Flow Cytometry Unit, University Research Headquarters, Universidad de Antioquia, Medellín, Colombia
| | - Benjamín Rojano
- Faculty of Sciences, Universidad Nacional de Colombia, Medellín, Colombia
| | - Giovanni Restrepo
- Faculty of Agricultural Sciences, Universidad Nacional de Colombia, Medellín, Colombia
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Lee S, Kim YM, Cheong HT, Park CK, Lee SH. Effect of Magnetized Freezing Extender on Membrane Damages, Motility, and Fertility of Boar Sperm Following Cryopreservation. Animals (Basel) 2023; 13:ani13040634. [PMID: 36830421 PMCID: PMC9951754 DOI: 10.3390/ani13040634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 02/09/2023] [Accepted: 02/09/2023] [Indexed: 02/15/2023] Open
Abstract
Magnetized water is defined as the amount of water that has passed through a magnet. The magnetic field weakens the hydrogen bonds between the water molecules, leading to the magnetized liquid acquiring special characteristics such as easy supercooling and forming smaller ice crystals. We researched the influences of a magnetized freezing extender on cell membrane damage and in vitro fertilization of boar sperm during cryopreservation. The freezing extenders were passed through 0, 2000, 4000, and 6000 gausses (G) of magnetic devices using a liquid cycling pump system and then used for the sperm freezing process. The damage to plasma, acrosomal, and mitochondrial membranes in frozen-thawed spermatozoa was investigated by flow cytometry, and motility was assessed using the CASA system. The fertility of frozen-thawed sperm was estimated using in vitro fertilization. The damage to the membranes was significantly decreased in the magnetized freezing extender by the 6000 G magnetic field compared to that of the control in frozen-thawed sperm, and motility was increased in the 6000 G group. Although there were no significant differences in the cleavage rates of in vitro fertilized oocytes among the treatment groups, the ratio of blastocyst formation increased in the magnetized freezing extender groups compared with that in the control group. The number of blastocysts was significantly higher in the 4000 G group than in the 0 G group. In conclusion, these results suggest that a magnetized freezing extender could improve the freezability of sperm and the development of oocytes fertilized in vitro with frozen-thawed sperm.
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Affiliation(s)
- Seunghyung Lee
- College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Yong-Min Kim
- Swine Science Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea
| | - Hee-Tae Cheong
- College of Veterinary Medicine, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Choon-Keun Park
- College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Sang-Hee Lee
- College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
- Correspondence:
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Gautier C, Aurich C. "Fine feathers make fine birds" - The mammalian sperm plasma membrane lipid composition and effects on assisted reproduction. Anim Reprod Sci 2022; 246:106884. [PMID: 34776291 DOI: 10.1016/j.anireprosci.2021.106884] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 10/28/2021] [Accepted: 10/29/2021] [Indexed: 12/14/2022]
Abstract
The sperm plasma membrane is important in modulating many sperm functions. The sperm membrane is composed of a complex mixture of lipids including phospholipids, glycolipids and sterols. There are differences of sperm membrane composition among mammalian species with two groups differing in the most abundant polyunsaturated fatty acid (PUFA), either docosahexaenoic (ω-3 PUFA) or docosapentaenoic acid (ω-6 PUFA). During testicular and epididymal maturation, composition of the sperm plasma membrane evolves with spermatozoa gaining the capacity for fertilization. The importance of fatty acid metabolism for complete spermatogenesis has been elucidated using gene knockout mice. During epididymal transit cholesterol content decreases and PUFA content increases, conferring more fluidity properties to the sperm membrane. The relatively lesser content of antioxidant enzymes and the relatively larger content of PUFA make the spermatozoa particularly susceptible to lipid peroxidation during sperm preservation. In numerous studies, there was adding of PUFA and antioxidants to the diet of animals or to semen extenders with the aim to improve sperm membrane integrity. This review highlights the current knowledge on the sperm membrane composition and effects on sperm function in mammalian domestic animals.
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Affiliation(s)
- Camille Gautier
- Artificial Insemination and Embryo Transfer, Department for Small Animals and Horses, Vetmeduni Vienna, 1210 Vienna, Austria
| | - Christine Aurich
- Artificial Insemination and Embryo Transfer, Department for Small Animals and Horses, Vetmeduni Vienna, 1210 Vienna, Austria.
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Zhang W, Min L, Li Y, Lang Y, Hoque SAM, Adetunji AO, Zhu Z. Beneficial Effect of Proline Supplementation on Goat Spermatozoa Quality during Cryopreservation. Animals (Basel) 2022; 12:ani12192626. [PMID: 36230367 PMCID: PMC9558967 DOI: 10.3390/ani12192626] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 09/23/2022] [Accepted: 09/28/2022] [Indexed: 11/16/2022] Open
Abstract
Sperm cryopreservation contributes to the extensive utilization of artificial insemination (AI) in the daily livestock industry. However, due to the presence of few sperm with good biological function in post-thaw goat sperm, its use has been limited for AI purposes. Hence, its improvement has been the focus of many research studies. This study aimed to investigate the effects of proline supplementation of the freezing medium on goat sperm. The goat semen was cryopreserved with freezing medium supplementation of different concentrations of proline (0, 0.5, 1, 2 and 4 mM). The post-thaw sperm motility patterns, membrane integrity, acrosome integrity, lipid peroxidation (LPO) levels, malondialdehyde (MDA) levels, total antioxidant capacity (T-AOC), proline dehydrogenase (PRODH) activity, superoxide dis-mutase (SOD) activity, glutathione (GSH) levels and GSH/GSSG were evaluated. Likewise, the expression and immunofluorescent localization of PRODH in post-thaw goat sperm was also detected. It was observed that addition of 2 mM proline to the freezing medium significantly enhanced post-thaw goat sperm total motility, progressive motility, straight-linear velocity (VSL), curvilinear velocity (VCL), average path velocity (VAP), straightness (STR), linearity (LIN), membrane integrity and acrosome integrity. Interestingly, PRODH was expressed in post-thaw goat sperm, especially in the post-acrosome and sperm tail. Addition of 2 mM proline also significantly increased the post-thaw sperm PRODH activity compared to the control. Moreover, post-thaw goat sperm LPO levels and MDA levels were reduced by supplementation of 2 mM proline. Furthermore, compared to the control, the values of post-thaw goat sperm T-AOC, SOD activity, GSH level and GSH/GSSG were also significantly increased in 2 mM proline treatment. Reduction of post-thaw goat sperm apoptosis in 2 mM proline treatment was also observed as the levels of Caspase3 and Caspase9 were decreased by the supplementation with 2 mM proline. These observations suggest that the addition of 2 mM proline to the freezing medium increased post-thaw goat sperm quality by reducing oxidative stress during cryopreservation. These findings also provide novel insights into the use of proline as an efficient additive to enhance post-thaw goat sperm quality during cryopreservation.
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Affiliation(s)
- Weijing Zhang
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China
| | - Lingjiang Min
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China
| | - Yajing Li
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China
| | - Yaning Lang
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China
| | - S. A. Masudul Hoque
- Department of Animal Breeding and Genetics, Faculty of Veterinary Medicine and Animal Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
| | - Adedeji Olufemi Adetunji
- Department of Animal Sciences, North Carolina Agricultural and Technical State University, Greensboro, NC 27411, USA
| | - Zhendong Zhu
- College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China
- Correspondence:
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Ebrahimi B, Matavos-Aramyan H, Keshtgar S. The cryoprotective effect of vitamins on human spermatozoa quality: a systematic review and meta-analysis. Cell Tissue Bank 2021; 23:213-225. [PMID: 34476664 DOI: 10.1007/s10561-021-09953-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 08/18/2021] [Indexed: 01/19/2023]
Abstract
The Cryopreservation of spermatozoa ensures preserving fertility potential after some medical treatments such as chemotherapy and radiotherapy in cancer patients. However, many spermatozoa encounter serious damages, and their motility and viability decrease considerably after thawing. The excessive production of reactive oxygen species is one of the major causes of these damages. The supplementation of cryopreservation media with vitamins, which are well-known antioxidants, can reduce cryopreservation-induced damages. In this systematic review, we aimed to evaluate the cryoprotective effect of various vitamins on the quality of cryopreserved-thawed human spermatozoa. Two researchers searched PubMed, ISI, and Scopus databases up to March 2020. All original articles using vitamins in human spermatozoa cryopreservation media were included. We used a standardized form to extract sample size and to determine sample quality, the type and dose of vitamins, and the cryopreservation methods and their effects. We performed a meta-analysis on studies with available data (Mean + SD in cryoprotectant and cryoprotectant + cryoprotectant groups). We also performed a test of between-study heterogeneity, subgroup analysis, and meta-regression. Out of 258 studies, 16 articles were included for the analysis. Our meta-analysis revealed that using vitamins in cryopreservation media could increase motility by 4.60% (95% CI 6.16, 3.05; P = 0.0001), viability by 5.71% (95% CI 9.71, 1.72; P = 0.0001), and DNA integrity by 10.20% (95% CI 12.98, 7.42; P = 0.0001) in cryopreserved-thawed spermatozoa. We found a significant correlation between using vitamins and improved spermatozoa quality; the sperm motility and viability were improved and DNA fragmentation was reduced after thawing by vitamins. However, we could not emphasize on any type or dose of vitamins but we conclude that the anti-oxidative function of vitamins is the main reason for these benefits.
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Affiliation(s)
- Bahareh Ebrahimi
- Shiraz Geriatric Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Hedieh Matavos-Aramyan
- Department of Physiology, School of Medicine, Shiraz University of Medical Sciences, 71348-45794, Shiraz, Iran
| | - Sara Keshtgar
- Department of Physiology, School of Medicine, Shiraz University of Medical Sciences, 71348-45794, Shiraz, Iran.
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Effects of astaxanthin on plasma membrane function and fertility of boar sperm during cryopreservation. Theriogenology 2021; 164:58-64. [PMID: 33550092 DOI: 10.1016/j.theriogenology.2021.01.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 01/15/2021] [Accepted: 01/15/2021] [Indexed: 01/06/2023]
Abstract
Mammalian sperm is highly susceptible to reactive oxygen species (ROS) during the cryopreservation process. Astaxanthin (AST), a red pigment of the carotenoid family, is recognized as having a variety of beneficial biological activities and effects, including antioxidant, anticancer, anti-diabetic, and anti-inflammatory. The present study aimed to investigate whether the presence of AST protected boar sperm from ROS stress during cryopreservation. Boar sperm was diluted with a freezing medium supplemented with different concentrations of AST (0, 0.5, 1, 2, or 5 μM). The addition of AST, especially at a concentration of 2 μM, exerted positive effects on post-thaw sperm motility parameters. Meanwhile, sperm plasma membrane integrity and acrosome integrity of post-thaw sperm were significantly increased, while lipid peroxidation was inhibited in response to 2 μM AST treatment. Interestingly, compared to the control, supplementation with 2 μM AST increased unsaturated fatty acids (UFAs) levels and decreased saturated fatty acids (SFAs) content in post-thaw sperm, leading to a decreased ratio of SFAs/UFAs in the AST group. In conclusion, the addition of AST to freezing extenders inhibited lipid peroxidation and regulated fatty acid composition of the sperm membrane, improved post-thaw sperm quality, and had no adverse effect on boar sperm in vitro fertilization (IVF) capacity and potential for embryonic development. Our data provide a novel insight into understanding the mechanisms of AST concerning protecting boar sperm quality against ROS damage during cryopreservation.
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Silva LKX, Lourenço JDB, da Silva AOA, de Sousa JS, Silva AGME, Dos Reis AN, Miranda MDS, Santos SDSD, Ohashi OM, Martorano LG, da Rocha GN, Faturi C, de Morais E, Mares ÉKL, Garcia AR. Increased quality of in natura and cryopreserved semen of water buffaloes supplemented with saturated and unsaturated fatty acids from the palm oil industry. Anim Reprod 2020; 17:e20200522. [PMID: 33791028 PMCID: PMC7995264 DOI: 10.1590/1984-3143-ar2020-0522] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Ruminant energy supplementation with vegetable oils or fats has been standing out worldwide and oil palm processing has been receiving growing interest. This study assessed the effect of supplementation with saturated and unsaturated fatty acids from the palm oil industry on the lipid profile of seminal plasma and of the sperm membrane, as well as on the morphological and functional characteristics of raw and cryopreserved buffalo semen. Twelve purebred Murrah bulls (Bubalus bubalis) were assigned to the experimental groups and fed diets for 120 days with no added lipids (CONT, four bulls), or with an extra amount of 3% lipids from crude palm oil (PALM, four bulls), or from palm oil deodorizer distillate (PODD, four bulls). Semen was collected and cryopreserved every 15 days. The lipid composition of membranes and semen quality were determined after collections. Lipid supplementation did not impact feed intake (P>0.05). Diet enrichment with PALM increased the linoleic acid (C18:2,ω6) in seminal plasma. Lipid supplementation did not increase the polyunsaturated fatty acids in the sperm membrane composition, but significantly increased the lignoceric acid (C24:0). Cryopreserved semen of the supplemented bulls presented higher progressive motility (60.2 vs. 67.9 vs. 65.2%; P<0.05) and sperm viability detected by eosin-nigrosin staining (61.1 vs. 69.4 vs. 67.8%; P<0.05). Palm oil reduced major sperm defects in both raw (12.2 vs. 9.3 vs. 13.2%; P<0.0001) and cryopreserved semen (12.4 vs. 9.4 vs. 11.2%; P<0.0001). The lipids added to the diet did not impact the population of spermatozoa with intact plasma and acrosomal membranes (PI-/PSA-), but significantly increased the percentage of spermatozoa with high mitochondrial potential (25.6 vs. 31.5 vs. 32.0%; P=0.008). The results suggest that lipid supplementation based on crude palm oil or palm oil deodorizer distillate can be safely used to feed buffalo bulls and may increase sperm attributes related to male fertility.
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Affiliation(s)
| | | | | | - José Silva de Sousa
- Centro de Biotecnologia em Reprodução Animal, Universidade Federal do Pará, Castanhal, PA, Brasil
| | | | - Adriana Novaes Dos Reis
- Centro de Biotecnologia em Reprodução Animal, Universidade Federal do Pará, Castanhal, PA, Brasil
| | - Moysés Dos Santos Miranda
- Laboratório de Fertilização in Vitro, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brasil
| | | | - Otávio Mitio Ohashi
- Laboratório de Fertilização in Vitro, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brasil
| | | | | | - Cristian Faturi
- Instituto de Saúde e Produção Animal, Universidade Federal Rural da Amazônia, Belém, PA, Brasil
| | - Eziquiel de Morais
- Instituto de Medicina Veterinária, Universidade Federal do Pará, Castanhal, PA, Brasil
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Lee SH, Kim YJ, Kang BH, Yun YS, Park CK. The relationship between acrosome reaction and polyunsaturated fatty acid composition in boar sperm. Reprod Domest Anim 2020; 55:624-631. [PMID: 32108385 DOI: 10.1111/rda.13661] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 02/18/2020] [Indexed: 01/29/2023]
Abstract
This study investigated the relationship between acrosome reactions and fatty acid composition with respect to fertility in boar sperm. The acrosome reaction was induced more than 85% by 60 mM methyl-beta-cyclodextrin (MBCD), and plasma membrane integrity was significantly reduced dependent on the MBCD level in boar sperm (p < .05). The acrosome-reacted sperm exhibited significantly higher saturated fatty acids (SFAs) and lower polyunsaturated fatty acids (PUFAs) composition compared to the non-acrosome reaction group (p < .0001). In addition, the PUFAs, C22:5n-6 (docosapentaenoic acid [DPA]; p < .01) and C22:6n-3 (docosahexaenoic acid [DHA]; p < .0001) were significantly decreased, and cleavage and blastocyst formation of oocytes were significantly (p < .0001) decreased in acrosome-reacted sperm relative to non-acrosome-reacted sperm. Moreover, acrosome reaction was positively correlated with SFAs, whereas negatively correlated with PUFAs, of the PUFAs, the DPA (p = .0005) and DHA (p = <.0001) were negatively correlated with the acrosome reaction. Therefore, these results suggest that the PUFAs composition of sperm is closely involved in acrosome reaction in pigs.
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Affiliation(s)
- Sang-Hee Lee
- Discipline of Information and Communication Technology, University of Tasmania, Hobart, Tasmania, Australia
| | - Yu-Jin Kim
- College of Animal Life Sciences, Kangwon National University, Chuncheon, Korea
| | - Byeong Ho Kang
- Discipline of Information and Communication Technology, University of Tasmania, Hobart, Tasmania, Australia
| | - Yong Sik Yun
- Department of Mathematics and Research Institute for Basic Sciences, Jeju National University, Jeju, Korea
| | - Choon-Keun Park
- College of Animal Life Sciences, Kangwon National University, Chuncheon, Korea
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