Studies on the Population Dynamics of the Pine Needle Gall Midge , Thecodiposis japonensis Uchida et Inouye , in the Frontal Zones of its infestation

Buom Young Lee 한국산림과학회 1988 한국산림과학회지 Vol.77 No.1

Comparative studies of the population dynamics of the pine needle gall midge, Thecodiplosis japonensis Uchida et Inouye, were made in four Korean red pine forests located in Chungchongnamdo (province), where the midge appeared recently. the results were summarized as follows 1. After of the pine needle gall midge into a red pine forest, its annual changes in patterns of population density reached peak severity gradationally arid then decreased rapidly to non-injurious level thereafter. And the positive correlation-ship between percentages of current needles infested and the number of adults emerged in unit area was not found within a generation. 2. The midge populations reached to low equilibrium Levels within two or three years after the peak. 3. The survivorship curves of the pine needle gall midge showed a stop-like curves representing low mortality in its larval stage within galls at the both sites increasing in population density and stabilized in low level, but those at the sites that its density began to decrease following peak severity of damage showed much straightened survivorship curves having more constant mortality per unit time-intervals. 4. The survivorship differences relating to the state of infestation progress were evident for newly hatched larvae, larvae in galls and larvae or pupae in the soil. 5. The realized fecundity of female adults among tire potential eggs were ranging from 6.6% to 40.4% in accordance with the infestation progress and also the year surveyed. The major mortality in this stage was possibly influenced by the climatic conditions and the shortage of suitable pine needles for oviposition. 6. For the immature stages of newly hatched larvae in the tree crown, the survivorship trends showed obvious differences ranging from 15% to 85% in mortality between the sites with increasing and decreasing populations. The mortality factors in this stage were unfavorable morphological and physiological conditions of host needles ; they are narrowness and consequent flexibility of the needles and high rate of needle divergence in hatching season. 7. The mortality of larvae within galls were 3.4% at the minimum and 88.7% at the maximum, which reflected much heavier mortality at the sites just after peak severity of damage. Most of the mortality occured in this larval feeding period in galls was induced by the early withering of shoots or of galls themselves. 8. For sites with high population levels, intr.aspecific competition for food were recognized at the larva. stage in galls. 9. The total mortality for larvae and pupae in soi habitat was increased along with the stage of infestation progressed as 51.3% at site with. increasing population, 67.8 to 82.5 at site; with decreasing one and 80.7% to 88.7% at stabilized sites respectively. 10. The mortality of overwintering larvae in soi: until late March were higher at the site where follows peak severity as 34.2% to 55.8% in comparison with the figure of 30.9% and 24.8% to 39.0% at sites with increasing and stabilized population respectively. 11. The periodic mortality of larvae and pupae in soil since early April was 29.5% to 37.5% at increasing sites, 35.3% to 60.0% at decreasing sites and 67.3 to 85.3% at stabilized sites. These differences during this period were caused mainly by its parasites. 12. Female/male sex ratio of adults collected in emergence traps varied along with different sites and were correlated with population density. 13. Parasitization by Platygaster matsutama was high at decreasing and stabilized population sites, but that by Inostemma seoulis was negligible at all sites, and coincidental parasite species with host had high parasitism. The density increasing of parasite had delayed-density dependent process following the peak density of the host. 14. The parasites have probably weak functional response in host searching behavior and consequently their realized fecundity was very low. 15. The species composition and dive

Spermatogonial Stem Cells

Buom-Yong Ryu 한국동물생명공학회(구 한국동물번식학회) 2006 Reproductive & developmental biology Vol.30 No.2

Characteristics and Practical Application of Spermatogonial Stem Cells

Buom-Yong Ryu 한국동물생명공학회(구 한국동물번식학회) 2011 발생공학 국제심포지엄 및 학술대회 Vol.2011 No.1

Spermatogenesis is a series of complex processes that produce spermatozoa in male testis and it occurs through consecutive cell divisions and differentiation of germ cells (Russell et al., 1990). This process is initiated by a small number of spermatogonial stem cells (SSCs) that are only two or three per 104 testis cells in mouse case, and finally gives rise to many functional spermatozoa. Similar to the characteristics found in other adult stem cells, SSCs have the capability of self‐renewal and differentiation (Meistrich and van Beek, 1993). SSCs that have these two capabilities are the source of maintaining male postnatal fertility for lifetime. SSCs that exist inside the male testis maintain the numerical equilibrium through self‐renew after birth and they are the only germ‐line stem cell that can transfer the genetic information to the next generation through spermatogenesis. Therefore, when genetic modification is performed at the SSC stage, it can produce transgenic offspring in the next generation as well as germ‐line modification so that it can deliver the transformed character stably to the descendants. Past studies regarding the SSC had been dependent on morphological observations due to the absence of a marker system that can distinguish the SSCs. Brinster et al. (1994) published a groundbreaking turning point in identifying characteristics of SSC by developing SSC transplantation technique (Brinster and Avarbock, 1994; Brinster and Zimmermann, 1994). Utilizing the SSC transplantation technique, the self‐renew and production capability of differentiated tissue derived from transplanted SSC within the recipient’s seminiferous tubule can be directly analyzed. The biological activity of SSCs can also be investigated objectively by the SSC transplantation technique. Since the advent of the SSC transplantation technique, there have been a lot of progresses in the biological field of SSC. Recently, the enrichment technique of SSCs using FACS and specific surface marker, in vitro culture, and genetic modification techniques of SSCs have been developed in rodents. These techniques have potential to enhance the practical applications of SSCs. Characterization and development of useful technique for SSCs are now extending to livestock species.

Spermatogonial Stem Cells

Buom-Yong Ryu 한국동물번식학회 2006 Reproductive & Developmental Biology(Supplement) Vol.30 No.2s

SURVIVORSHIP AND OTHER FACTORS RELATING TO POPULATION FLUCTUATION OF THE PINE GALL MIDGE Thecodiplosis japonensis

Buom Young Lee 한국산림과학회 1985 한국산림과학회지 Vol.71 No.1

Comparative studies of the population dynamics of the pine gall midge, Thecodiplosis japonensis, were made in four Japanese red pine forests having different initial infestation year respectively. Survivorship curves developed from these studies indicate that most gall midge mortality occurs in three periods of the larval stage: 1) in newly hatched larvae, prior to gall formation, 2) in young larvae, after the: galls have formed, and 3) in mature larvae that have dropped to the soil. At sites where midge populations were decreasing following a period of severe damage, mortality rates were much higher in all developmental stages than at sites with increasing populations. Examples of density dependent mortality which can combine `to suppress populations or stabilize them are: mortality of newly hatched larvae induced by physiological changes of needles resulting from severe midge damage; larval mortality resulting from early gall withering; and mortality caused by Platygaster matsutama, a parasite that attacks the midge larvae very early but kills them after they have dropped to the soil.

Stage-specific effects of glutathione, hypoxanthine and cadmium on preimplantation embryo development between mouse strains

류범용 ( Buom Yong Ryu ),( Myung Geol Pang ),( Byeong Jun Jung ),( Chang Suk Suh ),( Seok Hyun Kim ),( Young Min Choi ),( Jung Gu Kim ),( Shin Yong Moon ),( Jin Yong Lee ) 대한산부인과학회 1998 대한산부인과학회 학술대회 Vol.82 No.-

상업스포츠센터 종사원의 공감이 직무만족, 고객지향성, 서비스품질 및 조직충성도에 미치는 영향

김범 ( Buom Kim ),정정희 ( Jung-hee Jung ) 한국스포츠정책과학원(구 한국스포츠개발원) 2020 체육과학연구 Vol.31 No.2

[목적] 이 연구의 목적은 상업스포츠센터 종사원의 공감이 직무만족, 고객지향성, 서비스품질 및 조직충성도에 미치는 영향 관계를 구조방정식모형을 통해 실증적으로 분석하는 것이다. [방법] 서울지역에 소재한 11개소의 남녀 종사원 205명을 대상으로 하였다. 표본추출은 편의표본추출법과 설문지작성은 자기기입식으로 하였다. 제안한 구조모형을 검증하기 위해 IBM SPSSWIN Ver. 21.0과 AMOS 18.0을 사용하였다. [결과] 첫째, 인지적공감은 직무만족에 긍정적인 영향을 미쳤다. 둘째, 정서적공감은 직무만족에 긍정적인 영향을 미쳤다. 셋째, 커뮤니케이션공감은 직무만족에 긍정적인 영향을 미쳤다. 넷째, 직무만족은 고객지향성에 긍정적인 영향을 미쳤다. 다섯째, 직무만족은 서비스품질에 긍정적인 영향을 미쳤다. 여섯째, 직무만족은 조직충성도에 긍정적인 영향을 미쳤다. 일곱째, 고객지향성은 조직충성도에 긍정적인 영향을 미치지 않았다. 여덟째, 서비스품질은 조직충성도에 긍정적인 영향을 미쳤다. [Purpose] The purpose of this study was to empirically analyze the relationship between a commercial sports centers employees’ empathy, job satisfaction, customer orientation, service quality & organization loyalty through structural equation model analysis. [Methods] For this purpose, this study set 205 employees’ at the eleven commercial sports centers located in Seoul as the research subjects. In an effort to verify the proposed structural model, this study used IBM SPSSWIN Ver. 21.0 and AMOS 18.0. [Results] First, cognitive empathy had a positive effect on job satisfaction. Second, emotional empathy had a positive effect on job satisfaction. Third, communication empathy had a positive effect on job satisfaction. Fourth, job satisfaction had a positive effect on customer orientation. Fifth, job satisfaction had a positive effect on service quality. Sixth, job satisfaction had a positive effect on organization loyalty. Seventh, customer orientation didn’t had a positive effect on organization loyalty. eighth, service quality had a positive effect on organization loyalty.

상업스포츠센터 종사원의 유머지향성과 고객지향성이 종사원신뢰, 서비스품질, 스포츠센터관계의 질 및 관계유지와의 관계

김범 ( Buom Kim ),정정희 ( Jung-hee Jung ) 한국스포츠정책과학원(구 한국스포츠개발원) 2017 체육과학연구 Vol.28 No.3

[목적] 이 연구의 목적은 상업스포츠센터 종사원의 유머지향성과 고객지향성, 종사원신뢰, 서비스품질, 스포츠센터관계의 질 및 관계유지와의 관계를 구조방정식모형을 통해 실증적으로 분석하였다. [방법] 이를 위해 천안지역에 소재한 상업스포츠센터 5개소에서 3개월 이상 이용하고 있는 성인 남녀 224명을 대상으로 설문조사를 실시하였다. 표집방법은 편의표본추출법과 설문지 작성은 자기기입식으로 하였다. 제안한 구조모형을 검증하기 위해 IBM SPSSWIN Ver. 21.0과 AMOS 18.0을 사용하였다. [결과] 첫째, 유머지향성은 종사원 신뢰에 긍정적인 영향을 미쳤다. 둘째, 고객지향성은 종사원신뢰에 긍정적인 영향을 미쳤다. 셋째, 종사원신뢰는 서비스품질에 긍정적인 영향을 미쳤다. 넷째, 종사원신뢰는 스포츠센터관계의 질에 긍정적인 영향을 미치지 않았다. 다섯째, 종사원신뢰는 관계유지에 긍정적인 영향을 미쳤다. 여섯째, 서비스품질은 스포츠센터관계의 질에 긍정적인 영향을 미쳤다. 일곱째, 서비스품질은 관계유지에 긍정적인 영향을 미치지 않았다. [Purpose] The purpose of this study is to empirically inquire into the relationship between a commercial sports center employee's humor orientation & customer orientation and employees' trust, service quality, sports center relationship quality and relationship retention through structural equation model analysis. [Methods] For this purpose, the survey targeted 224 adult men and women who have used any one of the three commercial sports centers in Chungcheong for over three months. For sampling method, convenience sampling method was used, while the questionnaire was self-administered. In an effort to verify the proposed structural model, this study used IBM SPSSWIN Ver. 21.0 and AMOS 18.0. [Results] First, humor orientation was found to have a positive influence on employees' trust. Second, customer orientation was found to have a positive influence on employees' trust. Third, employees' trust was found to have a positive influence on service quality. Fourth, employees' trust was found not to have a positive influence on sports center relationship quality. Fifth, employees' trust was also found not to have a positive influence on relationship retention. Sixth, service quality was found to have a positive influence on sports center relationship quality. Seventh, service quality was also found not to have a positive influence on relationship retention.

휘트니스센터 고객의 자기결정성과 관계몰입, 고객지향성, 서비스품질 및 관계지속의도와의 관계

김범 ( Buom Kim ),정정희 ( Jung-hee Jung ) 한국스포츠정책과학원(구 한국스포츠개발원) 2018 체육과학연구 Vol.29 No.1

[Purpose] The purpose of this research is to empirically analyze the relationship between self-determination and relationship commitment, customer orientation, service quality, and relation continuity intention of fitness center customers through structural equation model analysis. [Methods] For this purpose, this study set 242 members at the five fitness centers located in Seoul as the research subjects. In an effort to verify the proposed structural model, this study used IBM SPSSWIN Ver. 21.0 and AMOS 18.0. [Results] As a result, first, autonomy had a positive effect on relationship commitment. Second, competence didn’t had a positive effect on relationship commitment. Third, relatedness had a positive effect on relationship commitment. Fourth, relationship commitment had a positive effect on customer orientation. Fifth, relationship commitment had a positive effect on service quality. Sixth, customer orientation had a positive effect on relation continuity intention. Seventh, service quality had a positive effect on relation continuity intention. [목적] 이 연구의 목적은 휘트니스센터 고객의 자기결정성 요인과 관계몰입, 고객지향성, 서비스품질 및 관계지속의도와의 관계를 구조방정식모형을 통해 실증적으로 분석하는 것이다. [방법] 서울지역에 소재한 5개소의 휘트니스센터 회원 242명을 대상으로 하였다. 표본추출은 편의표본추출법과 설문지작성은 자기기입식으로 하였다. 제안한 구조모형을 검증하기 위해 IBM SPSSWIN Ver. 21.0과 AMOS 18.0을 사용하였다. [결과] 첫째, 자율성은 관계몰입에 긍정적인 영향을 미쳤다. 둘째, 유능성은 관계몰입에 긍정적인 영향을 미치지 않았다. 셋째, 관계성은 관계몰입에 긍정적인 영향을 미쳤다. 넷째, 관계몰입은 고객지향성에 긍정적인 영향을 미쳤다. 다섯째, 관계몰입은 서비스품질에 긍정적인 영향을 미쳤다. 여섯째, 고객지향성은 관계지속의도에 긍정적인 영향을 미쳤다. 일곱째, 서비스품질은 관계지속의도에 긍정적인 영향을 미쳤다.

백강균을 처리한 소나무림의 낙엽과 토양에 서식하는 무척주동물 군집에 대한 다변량분석

이범영(Buom Young Lee),신상철(Sang Chul Shin),박영석(Young Seuk Park),권태성(Tae Sung Kwon) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.5

We tested if the treatment of Beauveria bassiana would influence invertebrate communities in litter and soils by multivariate analysis. The PCA (principal components analysis) was used for the analysis. Using the distances between communities in the ordination space, we carried out statistical tests whether any factors would influence structures of the communities. We did not found any significant effects of the Beauveria treatment on invertebrate communities in both litter and soils.