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Susceptibility of Two Species of Agricultural Pest Using Carbonyl sulfide
JeongSun Park,Eun-Mi Shin,Yeon-Jeong Woo,Bong Soo Kim,Jeong Oh Yang 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
Carbonyl sulfide is a chemical that is registered as a crop protection product in Australia due to microorganisms such as soil, plant roots, branches, fertilizers and compost. In order to develop new fumigants for domestic use, the susceptibility of Carbonyl sulfide fumigants to two agricultural pests was evaluated. The susceptibility of peach aphid and spotted mite, which is an agricultural pest, was evaluated. After 5 hours of treatment (10, 20, 40, 60, and 80 mg / L) . As a result, peach aphid larvae showed a high mortality rate of 97.6% at 10 mg / L and 100% at 20 mg / L or more. Larvae were found to have a rate of 95.8% at 80 mg / L. The insect mortality rate was 91.8% at 60 mg / L and 94.1% at 80 mg / L.
Jeongsun Kim,Seon-Ho Cho,Jong-Tae Park,Sun-Kyoung Yu,Su-Gwan Kim,Do Kyung Kim KOREAN ACADAMY OF ORAL BIOLOGY 2014 International Journal of Oral Biology Vol.39 No.2
Sambucus sieboldiana (SS) is a member of the familyCaprifoliaceae and has been recommended as a functionalmaterial because of its several bioactivities. Althoughnumerous literatures are available on the pharmacological andbiological activities, the biological activity of SS in boneregeneration process has not yet been well-defined. Therefore,in this study, the effect of SS was investigated in the proliferationand differentiation of MC3T3-E1 osteoblastic cell line. Thetreatment of SS did not significantly affect the cell proliferationin MC3T3-E1 cells. SS significantly accelerated themineralization and significantly increased the expression ofalkaline phosphatase (ALP) and osteocalcin (OC) mRNAs,compared to the control, in the differentiation of MC3T3-E1cells. SS significantly accelerated the decrease of osteonectin(ON) mRNA expression as compared with the control in atime-dependent manner in the differentiation of MC3T3-E1cells. These results suggest that the SS facilitate the osteoblastdifferentiation and mineralization in MC3T3-E1 osteoblastic cells. Therefore, there may be potential properties fordevelopment and clinical application of bone regenerationmaterials.
Managerial Entrenchment and the Valuation Effects of Toehold Acquisitions
Jeongsun Yun,Ki Beom Binh 한국재무학회 2007 한국재무학회 학술대회 Vol.2007 No.04
This paper examines the market reactions to toehold acquisitions to determine whether and under what circumstances the formation of a new large outside shareholder contributes to the shareholder value of the firm. We argue that although toehold acquisitions signal imminent challenges to the control of the management of the target firms, the challenges do not necessarily contribute to the shareholder value if the management is likely to resist ferociously. We find that while voting premium increases in response to toehold acquisitions for the entire sample, it depends on firm characteristics such as dual class stocks and the asset size whether shareholder value increases. Dual class targets exhibit a positive market reaction only if the controlling shareholders do not have sufficient corporate resources under their control, whereas single class targets show a significantly positive cumulative abnormal return regardless of the asset size. The results are consistent with the hypothesis that dual-class stocks are an outcome of the managerial incentives for entrenchment.
A Contrastive Study on the Polysemy Structure of the Preposition over and the Prefix over
Jeongsun Lee 한국중원언어학회 2017 언어학연구 Vol.0 No.42
This study aims to analyze polysemous tendencies in the use of prefix over and preposition over by identifying a semantic parameter that differentiates the two. This study first compares different semantic structures of polysemy over in them in terms of prototypicality based on a cognitive-semantic approach. This study further examines semantic differences expressed in the two distinct structures; ‘over (prefix) + head’ and ‘head + over (preposition).’ As for the prototypicality of the two, the data analysis of this study reveals that the notion of ‘excess’ is the most prototypical type in the use of prefix over while the notion of ‘spatial above’ is the most salient type in the use of preposition over, thus suggesting that the prototype of prefix over denotes a conceptual derivation from the spatial notion of the prepositional prototype. The findings also suggest that there exist semantic variations between expressions of phrasal verbs with preposition over and those of compounds with prefix over despite the same morphemes. Their differences seem to be significantly affected by the versatile semantic function of polysemy over.
Fumigant susceptibility to Cigarette beetle (Lasioderma serricorne, Fabricius)
JeongSun Park,Eun-Mi Shin,Bong Soo Kim,Young Mi Moon,Young-Ju Park,Jeong Oh Yang 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
The susceptibility of the Cigarette beetle, which are pests in tobacco, to methyl bromide and phosphine fumigants was evaluated. Five concentrations of each methyl bromide were selected for all stages and treated for 4 hours. As a result, 100% larvae were observed in eggs CT 51.20, late larva CT 73.61, pupa CT 71.87 and adult 52.87 mg h / L, respectively. The LCT50 values for methyl bromide were 13.896 for eggs, 36.038 for late larvae, 25.172 and 21.758 mg / l, respectively. The phosphine treatment was carried out for 5 to 6 concentrations (0.025, 0.051, 0.099, 0.501, 0.999 and 1.500 mg / L) for 20 hours. As a result, egg and late larvae showed 100% larvae at CT 5.137 and 6.435 mg h / L, respectively, and 61.9% and 98.9% of larvae and adult larvae were similar to each other. Pupae showed 86.4% larvae at CT 10.520 and 100% larvae at over 13.777 mg / h of CT. The LCT50 values for phosphine were 0.317 for eggs, 0.649 for late larvae, 3.748 for pupa and 0.703 mg / l for adults.
A Study on the Present Perfect used for Topic Communication in CNN and Yonhap News Reports
Jeongsun Lee 한국중원언어학회 2021 언어학연구 Vol.0 No.58
The purpose of this research is to figure out the features of the present perfect tense used in news reports especially from a perspective of topic flow. Based on two data sets, we analyzed topic types that the present perfect carried and reached following results. First, the present perfect was used for four topic types such as ‘topic introduction’ in the head, ‘topic shift’ and ‘topic elaboration’ in the middle, and ‘topic termination’ in the end texts. Second, the present perfect was found to convey more general information than specific information. The present perfect conveying general information includes the types used for ‘topic introduction’ delivering hot news in the lead, ‘topic shift’ providing other new information derived from the lead, and ‘topic termination’ expressing the final summary in the end. The present perfect carrying specific information includes ‘topic elaboration’. Third, the present perfect was also used for ‘topic emphasis’ as the present perfect, a more marked type than simple tenses, entered various locations amongst multiple past and present simples to highlight the gist of news topics in a variety of contexts.
( Jeongsun Bang ),( Sungmook Choi ) 글로벌영어교육학회(구 호남영어교육학회) 2018 Studies in English education Vol.23 No.2
The present study investigates the effects of pictures on short and long-term retention of English collocations. It also explores whether retention ability varies according to Korean-English collocational congruency. Participants in the study were Korean elementary school students who learn English as a foreign language (N = 64). These students were assigned to either a Picture or No-Picture condition, and were instructed to remember eight congruent English collocations (i.e., collocations that have Korean translation equivalents) and eight incongruent collocations (i.e., collocations that do not have Korean translation equivalents). Their short- and long-term retention of these collocations was assessed using collocation tests, both immediately and one week after learning. Overall findings indicate that pictures may be useful in promoting both short and long-term retention of English collocations. The study also found that the effects of pictures on collocational recall may not vary according to Korean-English collocational congruency. Given that this study is the first to examine the role of pictures in collocation learning, its findings appear to make significant contributions to existing L2 acquisition literature. Additionally, findings from this study could have an important influence on collocation teaching and learning for young EFL learners.
INEFFICIENT CORPORATE TAKEOVERS UNDER MULTIDIMENSIONAL SIGNALS
Jeongsun Yun 한국재무학회 2011 한국재무학회 학술대회 Vol.2011 No.05
This paper presents a model of corporate takeovers in a framework of auctions with multidimensional signals. The model considers a target firm whose value for each bidder is composed of both common and private values. A key novel feature of our model is that bidders privately observe a noisy signal that is positively but imperfectly correlated with the common value. Absent a noisy signal, which is true in most extant studies of common value auctions, bidders would be informed of a common value factor that is independent of each other. A symmetric equilibrium is developed where inefficient takeovers may take place because information regarding common value cannot be aggregated. Furthermore, we show that there is a non-monotonic relationship between the probability of inefficient takeovers and the precision of information.