As model waterborne acrylic coatings, mono-dispersed poly(butyl acrylate-methyl methacrylate) copolymer latexes of random copolymer and core/shell type graft copolymer were prepared by seeded multi-staged emulsion polymerization with particle size of 180~200 nm using semi-batch type process. Sodium lauryl sulfate and potassium persulfate were used as an emulsifier and an initiator, respectively. The effect of particle texture including core/shell phase ratio, glass transition temperature and crosslinking density, and film forming temperature on the film formation and final properties of film was investigated using SEM, AFM, and UV in this study. The film formation behavior of model latex was traced simultaneously by the weight loss measurement and by the change of tensile properties and UV transmittance during the entire course of film formation. It was found that the increased glass transition temperature and higher crosslinking degree of latex resulted in the delay of the onset of coalescence of particles by interdiffusion during film forming process. This can be explained qualitatively in terms of diffusion rate of polymer chains. However, the change of weight loss during film formation was insensitive to discern each film forming stages-I, II and III.

Two new species of Torodorinae-Hyperochtha acanthovalva sp. nov., and Antiochtha pycnotarsasp. nov.-and five new species of Lecithocerinae-Alciphanes clavata sp. nov., Frisilia ceylonica sp. nov., Carodista grypotatos sp. nov., C. tribrachia sp. nov., and C. wilpattuaesp. nov.-are described, with illustrations of their genitalia. Some generic relationships are discussed, Technographa Meyrick, syn. nov. with Timyra Walker and Stelechoris Meyrick, stat. rev. is proposed. Two species previously placed in Thubana Meyrick are transferred to the genus Stelechoris Meyrich, and ten species of Lecithocera are transferred to Carodista Meyrick.

Sri Lanka의 Lecithoceridae과 정리의 제6편으로 Alciphanes Meyrick, Parelliptis Meyrick, Carodista Meyrick, Synesarga Gozmany, Kalocyrma Wu, Technographa Meyrick, Mnesteria Meyrick, Teucrodoxa M Meyrick, Heterodeltis Meyrick, Pseudocrates Meyrick, Oxygnostis Meyrick, Dinochares Meyrick, and Dolchotorna Meyrickt속의 29종을 정리하였다. 그중 3종의 신종, Carodista fabajuxta sp. nov., Kalocyrma epileuca sp. novo and K. oxygonia sp. nov.,을 기재하였으며, 다음 12종의 학명은 그 속을 재구성 (new combination)하였다: Alciphanes tetraclina (Meyrick), A. holocona (Meyrick), A. palathodes (Meyrick), A. isochra (Meyrick), A. latycapna (Meyrick), Carodista paroristis (Meyrick), C. lycopis (Meyrick), C. geraea (Meyrick), C. epigompha (Meyrick), C. nubigena (Meyrick), C. paroristis (Meyrick), and Synesarga paroena (Meyrick).그리고 Catacreagra Gozmany은 Carodista Meyrick의 새로운 synonym으로 정리하며, Pseudocrates soritica Meyrick은 Sri Lanka 미기록종으로 확인되었다.

To find characteristics and areas of greater risk of oil spill at the coastal waters in Korea, some of risk factors were analyzed with historical data of oil spill and marine traffic. As a result, it is characterized that frequency of oil spill is increasing year by year and greatest percentage of spill source is fishing boat. It is proposed that the ports of Ulsan, Yeosu, Incheon and Pusan will be designated as primary area of risk as they have a higher risk of oil spills and its response authority is required to maintain appropriate regional response capability for prompt and effective response to a future spill incident. In addition, the regional response equipments at Ulsan are examined under a assumption of a medium size spill and it is found that the use of chemical dispersant can be an alternative when mechanical containment and recovery is not feasible in this area, and the existing response equipments may be appropriate to address that size of spill. However, the response authority is required to maintain more numbers of stronger boom for unsheltered waters and more quantity of concentrate dispersant to disperse all spilled oils on the water, furthermore the response authority should be prepared for a possible future catastrophic spill with sufficient equipments.

Sri Lanka의 Lecithoceridae과 정리의 제 4편으로 3속 30종에 대해 정리하였다. 그 중 Homaloxestis속 2종, Lecithocera속 4종, 그리고 Quassitagma속 1종 등 모두 7종의 신종을 기재하였다. 그리고 Lecithocera mazina Meyrick와 Quassitagma duplicata Meyrick 등 2종은 Sri Lanka 미기록종으로 확인되었다. 대상종 중 Homaloxestis ochrosceles와 Lecithocera속의 4종은 금번 연구에서 표본이 확인되지 않았다.

Sri Lanka의 Lecithoceridae과, Torodorina아과중 다음 3속을 정리한 결과 Deltoplastis속 11종, Hygroplasta속 7종, 그리고 Antiochtha속 9종 등 27종이 밝혀졌으며, 그 중 Deltoplastis figurodigita, D. lamellospina, D. cognata, Hygroplasta canitiana, H. promyctra, H. monila, H. onyxijuxta, H. utricula, H merinxa, and Antiochtha longivincula 등 10종을 신종으로 기재, 발표한다. Deltoplasta속의 commodata (Meyrick)는 clerodotis (Meyrick)의 synonym으로 그리고 D. tetradelta (Meyrick)는 cremnaspis (Meyrick)의 synonym으로 정리하며, amicella (Meyrick)는 Deloplastis속으로 소속시켰다. 신종의 기재를 비롯하여 이들 신종 및 기지종 중 아직 알려지지 않았던 암수 생식기를 처음으로 도해하였으며, 상기의 3속 종들 분 류동정을 위한 검색표를 작성하였다.

The local instabilities of accretion disks were extensively studied, with the considerations of radial advection, thermal diffusion and different disk geometry, dominated pressure and optical depth. Two inertial-acoustic modes in a geometrically thin, radiative cooling dominated disk depart from each other if very little advection is included. A geometrically slim, advection-dominated disk is found to be always stable if it is optically thin. However, if it is optically thick, the thermal diffusion has no effect on the stable viscous mode but has a significant contribution to enhance the thermal instability.

Based on the database of 128 disk galaxies (66 SO, 62 S and Irr) mailnly compiled from Kent and Gunn (1982) and Doi et a1.(1995) which is complete down to m < 15.6 mag within a radius of 3°, the orientation of spin vectors of disk galaxies of the Coma cluster has been analyzed. The results confirm the morphological dependence of the orientation of disk galaxies found from the analsis of the Virgo cluster. Common features of orientation of disk galaxies of both clusters are outlined.

A possible cosmic X-ray background(XRB) radiation related to original antimatter is considered. If the universe is made of separating domains of antimatter and matter, the photons produced by the annihilation of electron-positron and proton-antiproton on the last scattering surface would reach us in the energy ~0.45 keV and ~60 keV respectively because of the redshift. The spectrums of X-ray radiation from annihilation are deduced and a possible observational figure is described also.

COBE's results on the anisotropy of the cosmic microwave background radiation (CMBR) is discussed. Some ambiguities in the linear GI cosmic perturbation theory are clarified. The problem of the last scattering surface and the deficiencies of the linear cosmic perturbation theory are mentioned. The possible ways to overcome the theoretical difficulties are discussed also.

사용후핵연료 저장조는 지진하중에 대하여 운영기간중 자체의 구조적 건전성 및 저장된 사용후핵료의 안전성을 확보할 수 있어야 한다. 본 연구에서는 LRB 면진장치를 설치한 사용후핵연료 면진저장조의 지진시 거동특성을 파악하기 위하여 서로 다른 특성을 갖는 두종류의 지진에 대하여 지진해석을 하여 그 결과를 비면진 저장조에서의 응답과 비교하였다. 면진장치를 사용함으로써 지진시 상부구조로 전달되는 지진력과 응답을 크게 감소시켜 저장조와 저장된 사용후액연료의 안전성 확보에 유리한 것으로 나타났다.

초 록 한국, 중국, 필리핀산 흰등멸구의 계량형태학적 차이를 분석하기를 위하여 총 89개 부분의 형태적 특징(촉각 34, 다리45, 주둥이10)을 조사하고 계량형태적 분석을 위하여 정준 판별분석법을 이용하였다. Scatter plot diagram 상에서 3개 집단의 중심점은 분리현상이 뚜렷하였고 그 정도는 단시형 암컷에서 크게 나타났다. Mahalanobis distance(MD)는 단시형 암컷의 경우 3개 집단 모두 5%에서 유의성이 있었고, 장시형 암컷의 경우 MD는 중국산 대 필리핀산, 한국산 대 필리핀산이 각각 0.1%, 1%에서 유의성이 있었으나, 중국산 대 한국산은 유의성이 없었다.

Increasing resource use is the primary motivator for the development of technology industries, which is leading to severe consequences, such as the release and disposal of radioactive waste containing radionuclides in the environment. Cesium (137Cs) is one of the most hazardous radionuclides in the environment. In particular, the steel manufacturing process produces hazardous waste in the form of electric arc furnace dust contaminated with 137Cs. In this study, the tolerances of five legume species to different activity concentrations of 137Cs in both seed germination and initial seedling growth were compared. To determine 137Cs tolerance, several parameters related to the growth and development of legumes were measured. Among the five legumes studied, Crotalaria juncea L. was the most 137Cs tolerant at 50,000 Bq·L−1. Sesbania javanica Miq. and Vigna mungo L. Hepper were moderately tolerant to 30,000 Bq·L−1 137Cs. After 10 days, the stress tolerance indices in all legume species decreased by more than 50% at activity concentrations greater than or equal to 20,000 Bq·L−1 137Cs. This approach allows the selection of desirable traits, making more-effective application possible in the phytoremediation of 137Cs through stress tolerance. In conclusion, legumes are promising candidates for the phytoremediation of environmental pollutants.