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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
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.
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.
You, Young-Ah,Mohamed, Elsayed A.,Rahman, Md Saidur,Kwon, Woo-Sung,Song, Won-Hee,Ryu, Buom-Yong,Pang, Myung-Geol Elsevier 2018 Reproductive toxicology Vol.77 No.-
<P><B>Abstract</B></P> <P>2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a reproductive and developmental toxicant that can alter the sex ratio of offspring (proportion of male offspring). We hypothesized that the alteration of sex ratio is associated with sex chromosome ratio of live spermatozoa affected by exposure to TCDD. After exposure to TCDD we analyzed simultaneously sperm sex chromosome constitution and viability, and evaluated sperm sex chromosome ratio association with embryo sex ratio in mice. Short-term exposure to TCDD affects the decreased sperm motility and viability, and the increased acrosome reaction. Interestingly, Y spermatozoa survived shorter than X spermatozoa at high concentrations of TCDD. Moreover, the decreased sex ratio of embryos was associated with the short lifespan of Y spermatozoa. Our results suggest that TCDD may affect the fertility of Y spermatozoa more than X spermatozoa. Further studies are needed to compare the difference of fertilizing capability between X and Y spermatozoa by the effect of TCDD.</P> <P><B>Highlights</B></P> <P> <UL> <LI> TCDD causes defects in fertilizing ability of mice spermatozoa. </LI> <LI> TCDD affects the lifespan of live X- and Y- bearing spermatozoa. </LI> <LI> Spermatozoa exposed to TCDD can alter the embryo sex ratio. </LI> </UL> </P>
상업스포츠센터 종사원의 서비스품질과 커뮤니케이션이 갈등, 관계결속, 관계해지의도 및 관계지속의도에 미치는 영향
이영훈(Lee, Young-Hoon),정정희(Jung, Jung-Hee),김범(Kim, Buom) 한국사회체육학회 2018 한국사회체육학회지 Vol.0 No.73
The purpose of this research is to empirically analyze the influence (relationship) of commercial sports center employees’ service quality & communication on conflict, relationship commitment and dissolution intention & continuity intention through structural equation model analysis. For this purpose, the study set 238 members at the five commercial sports centers located in Cheonan as the research subjects. In an effort to verify the proposed structural model, the study used IBM SPSSWIN Ver. 21.0 and AMOS 18.0. As a result, first, the results showed that service quality didn’t have a positive effect on conflict. Second, it was found that service quality had a positive effect on relationship commitment. Third, the results showed that communication didn’t have a positive effect on conflict. Fourth, communication was found to have a positive effect on relationship commitment. Fifth, the results showed that conflict didn’t have a positive effect on relationship commitment. Sixth, the results showed that relationship commitment didn’t have a positive effect on dissolution intention. Seventh, relationship commitment was found to have a positive effect on continuity intention.
정전분사법에 의한 Al/CuO 복합체 분말 제작 및 점화 특성 연구
안지영(Ji Young Ahn),김지훈(Ji Hoon Kim),김상범(Sang Buom Kim),정훈(Hoon Jung),조명훈(Myung Hoon Cho),김수형(Soo Hyung Kim) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
고에너지 물질은 연료물질과 산화제로 구성되어진 물질로 일반적으로 연료물질과 산화제 물질이 혼합되어 있는 형태를 지닌다. 일반적으로 연료물질과 산화제 물질을 혼합하는 방법은 볼밀 혹은 초음파 에너지를 사용하여 혼합한다. 본 연구에서는 알루미늄 나노입자를 연료물질로 사용하고, 산화구리를 산화제 물질로 사용하여 고에너지물질을 제작하고 점화 특성에 대한 연구를 진행하였다. 본 연구에서는 중공노즐과 정전분사법을 사용하여 알루미늄-산화구리 코어-쉘 입자를 만들고자 하였다. 생성된 최종 입자의 알루미늄과 산화구리의 비율은 정전분사시 노즐에 공급하는 용액의 양을 조절함으로써 조절하였다. 정전분사법을 사용하여 제작한 입자의 물리적 특성은 SEM과 TEM을 사용하여 분석하였으며, 생성된 입자의 점화 특성은 고속카메라를 사용하여 측정하였다.
상업스포츠센터 상호작용성이 스포츠센터동일시, 지각된 서비스품질, 스포츠센터명성 및 고객충성도에 미치는 영향
김범(Kim, Buom),김원경(Kim, Won-Kyeong),윤영구(Yun, Young-Goo) 한국사회체육학회 2015 한국사회체육학회지 Vol.0 No.59
The purpose of this study is to analyze the following in an empirical manner through a structural equation modeling analysis: the correlation among the interactivity, identification, perceived service quality, reputation, and the customer loyalty of commercial sports centers. To accomplish the objective, 281 male and female adults who used a commercial sports center located in Seoul for more than 3 months were surveyed. In terms of sampling method, convenience sampling method was used, and the questionnaires were filled out with self-administration method. To verify the structural model proposed in this study, SPSSWIN Ver. 15.0 and AMOS 7.0 were used. The findings are as follows. First, the interactivity of the sports centers did not have a significant impact on sports center identification. Second, the identification had a significant impact on the perceived service quality. Third, the identification had a significant impact on the reputation of the sports centers. Fourth, the service quality perceived by customers did not have a significant impact on the customer loyalty. Fifth, the reputation of sports centers had a significant impact on the customer loyalty.
Mbd2-CP2c loop drives adult-type globin gene expression and definitive erythropoiesis
Kim, Min ,Young,Kim, Ji ,Sook,Son, Seung ,Han,Lim, Chang ,Su,Eum, Hea ,Young,Ha, Dae ,Hyun,Park, Mi ,Ae,Baek, Eun ,Jung,Ryu, Buom-Yong,Kang, Ho ,Chul,Uversky, Vladi Oxford University Press 2018 Nucleic acids research Vol.46 No.10
<P><B>Abstract</B></P><P>During hematopoiesis, red blood cells originate from the hematopoietic stem cell reservoir. Although the regulation of erythropoiesis and globin expression has been intensively investigated, the underlining mechanisms are not fully understood, including the interplay between transcription factors and epigenetic factors. Here, we uncover that the Mbd2-free NuRD chromatin remodeling complex potentiates erythroid differentiation of proerythroblasts via managing functions of the CP2c complexes. We found that both Mbd2 and Mbd3 expression is downregulated during differentiation of MEL cells <I>in vitro</I> and in normal erythropoiesis in mouse bone marrow, and Mbd2 downregulation is crucial for erythropoiesis. In uninduced MEL cells, the Mbd2-NuRD complex is recruited to the promoter via Gata1/Fog1, and, via direct binding through p66α, it acts as a transcriptional inhibitor of the CP2c complexes, preventing their DNA binding and promoting degradation of the CP2c family proteins to suppress globin gene expression. Conversely, during erythropoiesis <I>in vitro</I> and <I>in vivo</I>, the Mbd2-free NuRD does not dissociate from the chromatin and acts as a transcriptional coactivator aiding the recruitment of the CP2c complexes to chromatin, and thereby leading to the induction of the active hemoglobin synthesis and erythroid differentiation. Our study highlights the regulation of erythroid differentiation by the Mbd2-CP2c loop.</P>
Gd-Doped CeO<sub>2</sub> 분말의 마이크로파 소결
김영균,김석범,Kim, Young-Goun,Kim, Seuk-Buom 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.3
10 mol% $Gd_{2}O_{3}-CeO_{2}$ powder was sintered by microwave in a 2.45 GHz multimode cavity to develop a dense electrolyte layer for intermediate temperature solid oxide fuel cells (IT-SOFCs). Samples were sintered from $1100^{\circ}C$ upto $1500^{\circ}C$ by $50^{\circ}C$ difference and kept for 10 min and 30 min at the maximum temperature respectively. Theoretical density of the sample sintered at $1200^{\circ}C$ for 10 min was 95.4% and increased gradually upto 99% in the sample sintered at $1500^{\circ}C$ for 30 min. All of sintered samples showed very fine microstructures and the maximum average grain size of the sintered sample at $1500^{\circ}C$ for 30 min was $(0.87{\pm}0.42){\mu}m$. Ionic conductvity of the samples were measured by DC 4 probe method.