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Yongjun Kwon,Sejin Kim,Marana Park,Juwon Yoo,Joon-Ho Lee 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
Effectiveness of Encarsia formosa (Hymenoptera: Aphelinidae) to control Trialeurodes vaporariorum (Hemiptera: Aleyrodidae) was investigated in the commercial tomato greenhouse from January to June, 2010. Densities of T. vaporariorum were monitored using the yellow sticky trap for adult, and a lupe (x10) for 4th instar nymph and pupa at 1 week interval. Tomato seedlings were transplanted in mid-January and the nymph and adult of T. vaporariorum were first discovered in February 4th. E. formosa was applied as a mummy card at a recommended density (3 parasitoids per 1m2) at 2 weeks interval for 8 times. Mummy cards were collected 2 weeks later and the emergence and survival ratio of E. formosa were examined. Density of adult T. vaporariorum was significantly lower in the treatment plot (F=42.48, p=0.0001). The control efficiency ranged from 57.3% to 88.5%. The nymphal density was also significantly lower in the treatment plot (F=8.85, p=0.0053). The control efficiency was 84% on 25th March, 75% on 18th May and 95% on 25th May. Maximum 50% parasitism by E. formosa occurred in the treatment plot. The emergence and survival rates of E. formosa on mummy cardboards that were released in the greenhouse during February to March were only 53% and 41%, respectively. These rates increased to >70% as the temperature rises.
YongJun Kwon,JeongJoon Ahn,TaeGyun Kim,Joon-Ho Lee 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
This study was conducted to determine whether trichome density affects the oviposition behavior of adult female Tetranychus urticae Koch on host plant leaves. Experiments were conducted with twenty replications on the leaf discs of each plant (Pear, 'Niitaka'; Apple, 'Fuji'; Strawberry, 'Meahyang'; 3cm diameter) at 25℃, 60-70% RH and a photoperiod of 16:8 (L:D) h. One female T. urticae was placed on each disc. The number and locations of laid eggs were recorded at 24 h intervals until T. urticae died. The trichomes were distributed along the midrib of abaxial surface of pear leaves but were evenly distributed on that of apple and strawberry leaves. Eggs were mostly laid along the midrib of pear leaf disc, but eggs were laid not only along the midrib but also randomly over the leaf disc of apple and strawberry. Therefore, it appeared that T. urticae preferred to lay eggs on the specific location where trichomes were densely distributed. Further study is needed to quantify how different distribution patterns of T. urticae eggs on different plant leaves affect the efficacy of predatory mites to control T. urticae.
청소년의 행복감과 관련 변인들의 구조적 관계 분석: 비행경험 여부에 따른 집단 간 비교
권용준(Kwon, Yongjun),윤현정(Yun, Hyunjeong) 한국청소년정책연구원 2020 한국청소년연구 Vol.31 No.1
본 연구는 청소년이 지각한 행복감 관련 변인들로 부모관계, 또래관계, 교사관계, 그릿과 정서문제의 구조적 관계는 어떠한지 검증하고자 하였다. 또한 청소년의 비행경험 여부에 따라 행복감 관련 구조모형에는 어떠한 차이가 있는지 검증해보았다. 이를 위해 한국아동․청소년패널조사(KCYPS, 2018)의 중학교 1학년 패널 1차년 데이터 1,129명의 자료를 활용하였다. 자료분석은 SPSS 22.0과 AMOS 22.0을 활용하여 구조방정식 모형의 검증을 실시하였다. 주요 연구결과를 요약하면 다음과 같다. 첫째, 부모관계와 또래관계는 그릿과 정서문제, 행복감에 직접적인 영향력이 있었으나, 교사관계는 그릿에만 직접적인 영향력이 있는 것으로 나타났다. 또한 그릿은 정서문제와 행복감, 정서문제는 행복감에 직접적인 영향력을 미치는 것으로 나타났다. 둘째, 부모관계와 또래관계는 행복감과의 관계에서 그릿과 정서문제를 통한 각각의 부분매개효과가 있었고, 그릿과 정서문제를 순차적으로 거쳐 행복감에 간접적인 영향을 미치는 것으로 나타났다. 또한 교사관계는 행복감의 관계에서 그릿을 통한 완전 매개효과가 있었고, 그릿과 정서문제를 순차적으로 거쳐 행복감에 간접적인 영향을 미치는 것으로 나타났다. 끝으로 비행경험에 따른 집단 간 비교에서 비행집단에서는 또래관계가 행복감과 정서문제에 직접적인 영향력이 있었지만, 일반집단에서는 유의하지 않았다. 이러한 본 연구결과는 청소년들의 행복감에 관련 변인들의 구조적 관계를 비행경험 여부에 따라서 그 차이를 살펴보았다는 점에서 의의가 있다. 이를 바탕으로 청소년기 행복감과 관련하여 주요 시사점 및 후속연구를 제안하였다. The purposes of this study were to investigate the structural relationships among adolescent’s perception of parental relationships, peer relationships, teacher relationships, grit, emotional problems, happiness, and to find out whether there were differences in the structural relationships among such variables by delinquency behavior. A total of 1,129 middle school students, whose data was taken from the Korea Children & Youth Panel Survey(KCYPS, 2018) were used in this study. The results of the analysis were as follows. First, adolescent`s perception of parental relationships, and peer relationships had a direct and significant effect on grit, emotional problems, and happiness. Additionally, student-teacher relationships had a direct and significant effect on grit, but it had not a direct effect on happiness. Second, the results of the analysis demonstrated that grit and emotional problems partially mediated the relationships between parental relationships and happiness, and peer relationships and happiness. Moreover, grit fully mediated the relationships between student-teacher relationships and happiness. Furthermore, grit and emotional problems double-mediated between social relationships (parental, peer, student-teacher) and happiness. Finally, there was a significant difference in the structural relationships of the variables influencing happiness between the ordinary and delinquent groups. Based on these results, the implications were discussed and further studies were suggested.
TaeGyun Kim,YongJun Kwon,JeongJoon Ahn,Joon-Ho Lee 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
The objective of this study was to evaluate the effective inoculation position of Neoseiulus californicus for control of Tetranychus urticae on apple branch. This study was conducted under green house conditions. N. californicus was inoculated at different position (Top, Middle and Bottom) of apple branch with a 20:1 ratio (T. urticae:N. californicus). Overall, N. californicus significantly reduced T. urticae numbers in the treatment branches than in the control branch. At 10th day, the T. urticae population was most significantly reduced in the treatment ‘Top’ in which N. californicus were inoculated on the leaf positioned in the top of a branch than in other treatments. At 20th day, most of T. urticae were exterminated in all treatment branches. The daily movement of N. californicus and T. urticae,and their coexistence on apple branch was monitored. Adult N. californicus disappeared from the branch as soon as T. urticae were exterminated in the treatment branches. The result indicates that N. californicus disperse downwards more than upwards in the tree, and the most effective inoculation position for N. californicus for control of T. urticae is the leaves positioned in the top of a branch.
TaeGyun Kim,Jeongjoon Ahn,YongJun Kwon,Joon-Ho Lee 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
This study was conducted to compare the effectiveness of single and combination use of N. californicus and N. womersleyi for control of Tetranychus urticae. The experiment was conducted with 5 replications in kidney bean leaf disc (2.5cm diameter) at 25℃, 60-70% RH, a photoperiod of 16:8 (L:D) h. The inoculation ratio was 5:1 for T. urticae:pytoseiidae mite and treatments are: a, N. californicus:T. urticae (4 adult female:20 adult female) b, N. womersleyi:T. urticae (4:20) c, (N. californicus+N. womersleyi):T. urticae ((2+2):20) d, Only T. ulticae (20). T. urticae population became significantly lower in the treatment plots than in the control plot but the higher egg number of T. urticae was observed in the treatment "b" plot than in "a" and "c" plots. In the "c" plot, lower number of N. womersleyi was observed than N. californicus. The result indicates that single use of N. californicus and combination use of N. californicus and N. womersleyi were more effective than single use of N. womersleyi but, there was no significantly difference between single use of N. californicus and combination use of N. californicus and N. womersleyi for control of T. urticae. Also, N. californicus appears to interfere or outcompete N. womersleyi.
Seasonal Occurrences of Peach Pyralid Moth and Persimmon Fruit Moth in Persimmon Orchards
Hunsung Kim,Taegyun Kim,Yongjun Kwon,Sejin Kim,Joon-Ho Lee 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
This study was conducted to identify the seasonal occurrence patterns of peach pyralid moth, Dichocroscis punctiferalis (Guenee), and persimmon fruit moth, Satthmopoda masinissa Meyrick, in persimmon orchards in four different regions, Ulsan and Jinyeong in Gyeongsangbuk-do, and Naju and Yeongam in Jeollanam-do. Three pheromone traps (Delta trap, GreeAgro Tech) for each moth species were installed at each site and checked with 1 week intervals. Peach pyralid moth and persimmon fruit moth occurred in all four study sites. Two moth species exhibited two distinctive peaks, but there were some time differences in the peak among sites. Peach pyralid moth first occurred in late May to early June in Ulsan, Jinyeong and Naju but occurred in late July in Yeongam. Overall, the first peak appeared in mid- to late June but the time of the second peak varied widely among sites. Persimmon fruit moth first occurred in early to mid-June in Ulsan, Jinyeong and Naju but occurred in mid-May in Yeongam. The first peak appeared in mid- to late June in Ulsan, Jinyeong and Naju but it appeared in late May in Yeongam. The time of the second peak was around late August in the study sites except Ulsan where the second peak time was in late September.
Kim Woo Jae,Bang In Young,Kim Ji Hwan,Park Yeon Soo,Kwon Hee Tae,Shin Gi Won,Kang Min-Ho,Cho Yongjun,Kwon Byung-Hyang,Kwak Jung Hun,Kwon Gi-Chung 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.3
Reactive ion etching of silicon oxide and silicon nitride was conducted by the injection of nitrogen trifluoride (NF3) and nitrogen oxide trifluoride gas (F3NO). The etching process was studied using a residual gas analyzer (RGA) and optical emission spectroscopy (OES); this included confirming and comparing the characteristics of the F3NO plasma to that of the NF3 plasma by discharging and measuring the pure NF3 plasma and F3NO plasma. Furthermore, silicon oxide and silicon nitride etching were performed using a process gas (NF3, F3NO) and an argon mixture. The plasma etching process was similarly diagnosed by RGA and OES, and the etch rate was calculated by measuring the reflection. The etch rate of silicon oxide during F3NO/Ar plasma etching is approximately 94% of that for NF3/Ar plasma etching and the etch rate of silicon nitride is approximately 76% of that for NF3/Ar plasma etching under the same conditions. The RGA and OES measurements confirmed that more O+, NO+, and O2 + ions were generated in the F3NO plasma than in the NF3 plasma. This difference makes it possible to confirm the variation in etch rates between silicon oxide and silicon nitride.