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- 저자 : Mun-Jang Jeon (검색결과 76 건)
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간접접착술식에서 접착제의 종류에 따른 전단결합강도와 파절 양상
장문주,이대희,김현덕,전영미,김정기 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4
The purpose of this study was to compare the shear bond strength and failure type of various adhesives in indirect bonding technique. Five types of orthodontic bonding adhesives - ES(Excel sealant), EP(Excel paste), EA(sealant and past), T(Transbond XT sealant), L(Light bond sealant) - were used in this study. Metal bars(70×7×7㎜) were milled and sand-blasted with 50㎛ alumina and then coated with resin. resin blocks(3×4×5㎜) were made and bonded to the resin-coated metal bars with various adhesives. Shear bond strengths were measured by an universal testing machine. The film thickness, interface region. Self-curing resin, EX(Excel sealant) showed the greatest shear bond strength(22.82±3.05 ㎫) and self-curing resin, EP(Excel paste) showed the lowest shear bond strength(13.91±2.70 ㎫). The shear bond strength of self-curing resin, EA(sealant and past : 20.94±0.92 ㎫) was similar to those of light-curing resins, T(Transbond XT sealant : 20.90±2.34 ㎫), L(Light bond sealant : 18.12±1.63 ㎫) group. Most of the failure occurred between the resin coated metal bars and sealant regardless of the adhesives.
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솔잎혹파리의 寄生蜂인 혹파리등뿔먹좀벌(Inostemmahockpari)의 發育生態에 關한 硏究
전문장 대구대학교 산업기술연구소 1987 産業技術硏究 Vol.6 No.-
This study was carried out to elucidate the embryonic and postembryonic development of inostemma hockpari, an egg-larval parasite of the pine needle gall midge. Thecodiplosis japonensis, at Muan-gun, Chollanamdo, Korea, from 1984 through 1985. Inostemma hockpari and its host, Thecodiplosis japonensis are univoltine. The egg of Inostemma hockpare are pro-ovigenic and hydropic. The first instar larva of Inostemma hockpari was found in the nervous system of its host larva, and it was encysted by the tissues of thoracic and abdominal ganglia of the host. Inostemma hockpari has two larval instars.
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전문장 대구대학교 농업과학연구소 1987 農業科學硏究論文集 Vol.1 No.-
The role of parasites in the Japanese black pine(Pinus thunbergii) stands infested by the pine needle gall midge, Thecodiplosis japonensis, was studied at Nijino-Matsubara, Saga Prefecture, Japan, from March 1980 through April 1982. The density of host and its parasites in the pine stands where T.japonensis population decreased to non-injurious levels following an outbreak that peaked several years ago, is in a natural balance because they repeat their population oscillations, alternately.
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Mun-Jang Jeon,Won Il Choi,Kwang-Sik Choi,Yeong-Jin Chung,Sang-Chul Shin 한국응용곤충학회 2006 Journal of Asia-Pacific Entomology Vol.9 No.3
To understand influence of two species of parasitoids on host population dynamics, adult population dynamics of pine needle gall midge (PNGM), Thecodiplosis japonensis and two species of parasitoids, Inostemma matsutama and Inostemma seoulis were observed using emergence traps from 1986 to 2005. Density of PNGM decreased after outbreaks in 1986 and 1987 and showed density-dependent regulation. Relationships between density of PNGM and its parasitoids were linear except the period of outbreak regardless of parasitoids species. Relationships between host density and parasitism of I. matsutama and I. seoulis were density-independent and inverse density -dependent, respectively. I. seoulis was the dominant parasitoid against PNGM. Interspecific competition between two parasitoids was not strong and temporal niche segregation between two parasitoids was a possible mechanism for coexistence of two parasitoids. The parasitoid complex responded to changes in host density more sensitively than single parasitoid species. These results suggested that two parasitoid can stabilize PNGM population density without strong negative effects on each species of parasitoids.
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Jeon, Mun-Jang,Choi, Won-Il,Choi, Kwang-Sik,Chung, Yeong-Jin,Shin, Sang-Chul Korean Society of Applied Entomology 2006 Journal of Asia-Pacific Entomology Vol.9 No.3
To understand influence of two species of parasitoids on host population dynamics, adult population dynamics of pine needle gall midge (PNGM), Thecodiplosis japonensis and two species of parasitoids, Inostemma matsutama and Inostemma seoulis were observed using emergence traps from 1986 to 2005. Density of PNGM decreased after outbreaks in 1986 and 1987 and showed density-dependent regulation. Relationships between density of PNGM and its parasitoids were linear except the period of outbreak regardless of parasitoids species. Relationships between host density and parasitism of I. matsutama and I. seoulis were density-independent and inverse density-dependent, respectively. I. seoulis was the dominant parasitoid against PNGM. Interspecific competition between two parasitoids was not strong and temporal niche segregation between two parasitoids was a possible mechanism for coexistence of two parasitoids. The parasitoid complex responded to changes in host density more sensitively than single parasitoid species. These results suggested that two parasitoid can stabilize PNGM population density without strong negative effects on each species of parasitoids.
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Jeon, Mun-Jang 대구대학교 생명과학연구소 2003 생명과학연구 Vol.2 No.1
This paper deals with the emergence periods and annual fluctuations of the number of emergence of the pine needle gall midge, Thecodiplosis japonensis and its important parasites, Inostemma matsutama and Inostemma seoulis. This study was conducted to investigate the effect of parasites on the density-fluctuation of the pine needle gall midge, and the difference of emergence periods and sex ratios of each generation for these species, in the pine stand located in Namsung-dong, Keumho-eup, Youngchon-shi, Kyongsangbuk-do, Korea, for 3 years. Thecodiplosis japonensis and its parasites, Inostemma matsutama and Inostemma seoulis, are univoltine. T japonensis adults emerged in the field from May 16 to July 23 and peak emergence period was between June 9 and June 13. The adults of I. matsutama, an egg-larval parasite of T. japonensis, emerged from May 16 to June 17(peak between May 28 and June 5), whereas those of I. seoulis, an egg-larval parasite of T. japonensis, emerged from June 9 to July 23(peak between June 26 and June 30). The sex ratios of T. japonensis, I. mutsutama and I. seoulis obtained from field emergence trap were 5842, 52148 and 60140, respectively. Parasites were dependent on T. japonensis density during this study period.
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Mun Jang Jeon 한국산림과학회 1988 한국산림과학회지 Vol.77 No.1
This paper deals with the fundamental biology of the pine needle gall midge, Thecodiplosis japonensis and its important parasites, Platygaster matsutama and Inostemma seoulis. This study was conducted at Nijino-Matsubara, Saga Prefecture, Japan, for three and a half years in order to establish control measures for the pine needle gall midge, which had been causing serious damage to pine forests in Korea. The results obtained are summarized as follows : 1. The pine needls gall midge, T. japonensis has 1 generation per year. The adults emerge from early May until mid-July, and females lay eggs on the developing needles. Newly hatched larvae immediately move down between the needles to feed at their bases, which subsequently cause the formation of a gall. Mature larvae begin leaving the galls and dropping to the soil in mid -November, and overwinter in the soil or litter. Overwintering larvae begin pupation in late March, and the adult midges emerge about 5 weeks later. 2. Adults are much observed at twilight on sunny days, but are not observed on rainy days. Mating and oviposition take place soon after emergence. Eggs are laid in masses 2 to 3 ㎜ from the tips of the developing needles. Peak oviposition occurs between 17:00 and 20:00. Individual adults survive only 1 to 2 days in the laboratory. 3. The sex ratio obtained from field emergence trap and sweeping samples was 46 : 54 and 28 : 72, respectively. That obtained from laboratory -rearing was 59 : 41. 4. The average number of ovarian eggs per newly -emerged virgin female was 140.16±2.94(186 females), and the average number of eggs laid in the field was 110 (66 females). The average number of eggs per egg-mass was 7.5, and usually only one egg-mass is found on a needle pair. 5. The egg stage lasted 5-7days under the weather conditions of late May in the field, and the hatching percentage was very high. Hatching larvae immediately entered the bases of developing needles. 6. There are 3 larval instars, all of which are spent inside the developing gall. The average body lengths of instars 1, 2, and 3 were 0.49㎜ (August 26), 1.37㎜ (September 20) and 2.30 ㎜ (November 9), respectively. The average number of larvae per gall was 5.50 in July and 4. 96 in November. There was a linear relationship between the number of larvae per gall and the length of a gall, but there was no correlation between the number of larvae per gall and the length of an infested-needle. Larval body length was inversely related to the number of larvae per gall. Full-grown larvae(3rd-instar) leave the galls and drop to the soil from mid-November through January. Larval dropping is greatly intensified following rain. The larvae overwinter beneath the trees from which they drop at depths of 2-5㎝ in the soil or litter, and they begin pupating in late March. The population density of hibernating larvae decreased remarkably after mid-April. 7. Overwintering larvae pupate in their hibernation sites in the soil from late March through mid-June. Pupation occurs in the cocoon formed just prior or in a state of exposure, depending upon soil conditions. The pupal stage lasted 24-31 days at a laboratory temperature of about 20℃. 8. The damage of pine needles by T. japonensis begins with the entrance of the larvae into the base of needles. The elongation of infested needles ceases in July, and in August the bases of they needles begin to enlarge. Thereafter, galls rapidly enlarge, and during September and October the inner tissues of galls are completely destroyed by the feeding of the larvae. In November, the infested needles, which are only about half as only as healthy ones, turn yellow and wither. Most larvae are induced to leave the galls at that time. 9. Both parasites have 1 generation per year. Platygaster matsutama adults emerge from early May to mid-June, whereas those of Inostemma seeulis emerge from late May to mid-July. Soon after emergence the parasites mate and oviposition follows immediately.
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과수의 생육환경 모니터링을 위한 유비쿼터스 센서 네트워크의 적용 : 사과나무를 대상으로
전문장 ( Mun Jang Jeon ),심규원 ( Kyu Won Sim ),김민 ( Min Kim ) 한국지리정보학회 2009 한국지리정보학회지 Vol.12 No.3
본 연구는 유비쿼터스 센서 네트워크 기술을 이용하여 과수 생육환경의 모니터링 시스템을 구현하고, 또한, 수세활력도 차이에 따른 과실의 각종 품질을 조사하기 위하여 경상북도 영주시 풍기읍에 위치한 사과 과수원에서 이루어졌다. 사과나무의 수세활력도는 일사량, 온도 및 습도에 영향을 많이 받는 것으로 나타났으며, 또한, 수세활력도는 사과의 과중, 당도 그리고 미네랄 함량 등에 영향을 미치는 것으로 나타났다. 그리고 본 연구를 통해 구현된 과수의 생육환경 모니터링 시스템은 과학적인 재배 방법을 통해 과수의 품질 개선에도 기여할 뿐 만 아니라, 향후 유비쿼터스 적용분야의 확대에도 기여할 것으로 사료된다. This study was carried out to embody monitoring system of growing environments of fruit tree with Ubiquitous Sensor Network and to analyze various fruit qualities by the tree`s vigor in the apple orchard located in Poonggi-eup, Yeongju-shi, Gyeongsangbukdo, Korea. The tree`s vigor of apple trees was influenced to insolation, temperature, and humidity and it had influence on the weights, sugar contents and the quality(especially in mineral contents) of apples. The use of Ubiquitous Sensor Network will not only contribute to improve the quality of fruit by the offer of scientific fruit-cultivation method, but also to expand its application more and more.
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