잭업 드릴링 리그 (Jack-up drilling rigs)는 해양자원개발 분야 중 석유 및 가스 탐사 산업에서 널리 사용되는 대표적인 해양구조 물이다. 이러한 잭업 구조물은 대체로 얕은 수심에서 사용하도록 설계되었지만 에너지 산업의 추세로 대수심 및 가혹한 환경 조건에서도 사용이 가능한 설계가 요구되고 있다. 이러한 잭업구조물의 운영환경 확장에 따라서 과도한 설계를 최소화하고 신뢰성 반영된 설계법이 요구되었다. 기존의 해양구조물 산업에서 잭업 구조물의 설계법은 사용(혹은 허용)응력 설계 (WSD: Working (or Allowable) Stress Design) 방법을 사용하여 설계가 되고 있었다. 이러한 설치환경변화에 따라서 충분한 신뢰성을 확보가 가능한 하중 및 저항계수 (LRFD: Load and Resistance Factored Design) 방법을 최근 개발되었고 규정화가 되었다. LRFD 방법은 통계적 기반으로 한 한계상태설계 개념으로 잭업구조 물의 구성구조부재의 하중과 전산수치해석을 이용한 강도의 불확성을 하중 및 저항 계수로 표현하는 설계법이다. 개발된 LRFD 방법은 실제 잭업구조물 설계의 적합성 판단을 위하여 기존의 WSD 방법과의 정량적인 비교 분석이 반드시 필요하다. 따라서 본 연구는 기존의 WSD와 LRFD 방법으로 이용하여 실 잭업 구조물의 레그 구조를 대상으로 상용유한요소해석코드를 이용하여 정량적인 UC (Unity Check) 값을 기반으로 비교 분석하였다. 분석된 결과로 다양한 환경하중조건 하에서 LRFD 방법을 사용하여 잭업구조물의 레그(Leg) 설계에서 상 당히 합리적인 UC 값을 가지고 기존 대표적인 WSD기법 중에 하나인 API-RP 코드 대비 약 31 % 차이가 분석되었다. 따라서 LRFD 설계 방법이 WSD 방법에 비해 구조 최적화 및 합리적인 설계에 더 유리하다는 것을 확인할 수 있었다.

Up to days, 31 species of 7 genera of the tribe Xyleborini have been recorded from Korean peninsula. We have collected the bark beetles with Malaise traps from 2007 to 2009 in the central part of the Korean peninsula. As a result of this study, we report 2 species, Xyleborus japonicus Nobuchi, 1981 and X. pelliculosus Eichhoff, 1878, for the first time from Korea with brief descriptions and illustrations of diagnostic characters.

Recent corpus-based approaches have emphasised autonomous and process-oriented methodologies focused on developing learners’ cognitive skills. This cognitive development is based on consciousness-raising being considered a necessary condition for language learning (Schmidt, 1990). From this viewpoint, the study was aimed at how this kind of corpus-based approach contributes to EFL learners’ interlanguage development. To this end, the study examined advanced Korean learners’ acquisition of English determiners via a corpus-based methodology designed to enhance their cognitive ability and skills. To achieve this, the study contrastively analysed two methodologies: traditional structuralist and corpus-based. The former focused on a product-oriented perspective which is commonly used in Korean grammar classes, while the latter focused on a process-oriented perspective which was based on learners’ exploration of corpus data. The study discovers that both methodologies lead learners to raise their consciousness of knowledge about the grammatical rules of language, but the corpus-based methodology also raises learners’ consciousness of the knowledge of how language is used at the level of noticing. This result suggests that this level of consciousness, raised via a process-oriented corpus methodology, can contribute to EFL learners’ interlanguage development.

Monochamus alternatus and M. saltuarius were reported as the vectors of Bursaphelenchus xylophilus, pine wood nematode in Korea. According to Kwon et al. (2006), each of 2 species has occupied their own regional distribution : M. saltuarius in southern part including Jeju island and M. alternatus in mid-northern part of Korean peninsula. We measured the supercooling point (SCP) of 2 species (laboratory-reared populations) by each of developmental stages. The SCPs of 2nd, 3rd and 5th instar larvae of M. saltuarius were -7.68±0.19℃, -7.02±0.69℃, -4.93±1.34℃ each of stages. On the other hand, the SCPs of 3rd, 4th, 5th instar larvae and pupae of M. alternatus. were -4.46±1.12℃, -5.94±1.33℃, -7.83±1.44℃, -9.53±1.78℃ each of stages. The SCPs of M. saltuarius larvae generally was lower than that of M. alternatus. The pupae of M. alternatus and 2nd instar larvae of M. saltuarius had the lowest SCP among measured samples. On the other hand, the highest SCP were recorded in 2nd and 5th instar larvae, each. This result shows that regional distribution of 2 beetles may be associated with the adaptation capacity to low temperature represented by the SCP as well as the developmental temperature. However, beetles experimented were not collected from pine forest fields. In further study, we are planning experiments with field populations and all developmental stages.

Sclerodermus harmandi populations were collected from 6 Korean regions (Seoul, Gangwon, Chungcheong, Jeolla, Gyeonasang and Jeju provinces), 1 Chinese region (Nanjing) and 1 Japanese region (Tokyo). Above all was identified as the same species based on morphological characteristics. In present study, we compared the intra-specific characteristics of regional isolated populations of S. harmandi based on nucleotide and amino acid sequences of variant genomic and mitochondrial loci: the full length of internal transcribed spacer 1 and 2 (ITS1 & ITS2), the complete cytochrome oxidase subunit I and II (COI & COII) and tRNA genes for aspartate and lysine and 5'end of ATPase 8 genes. There were no significant differences among the analysed 9 populations regardless of regional segregation. The nucleotide and translated amino acid sequences similarities were significantly high, despite some sequence differences were found in same loci. This result support the report based on the morphological characteristics. However, we are conducting further study to identify whether sequence differences in specific loci are the characteristics of individual level in population or population level and to analyse the full sequences of mitochondrial DNA by regional segregation.

We analyzed how foraging area use changed in female Pipistrellus abramus during the breeding season. Radio tracking was used to follow 12 female P. abramus in Gyeongju City, from 2013 to 2015. We followed three bats in each of four stages of reproduction: early pregnancy, late pregnancy, lactation, and post-lactation. Our data showed that the usable area of a foraging site and the area that was actually used by bats in that site were different, and foraging site use also differed according to stage of reproduction. The bats used arable land the most, with use rates of 57%, 40.4%, and 73.2% during early pregnancy, late pregnancy, and lactation, respectively. Bats in a post-lactation state did not use arable areas at all and instead foraged over bodies of water 90% of the time. There was no difference in the use of each foraging environment between bats in early pregnancy and late pregnancy. However, bats in late pregnancy and those that were lactating did use arable land to different extents, and bats that were lactating and those that were post-lactation also used arable land and bodies of water to different extents.

We bred a new green-kerneled glutinous rice variety that can be cultivated in the whole area of Korea, because only one native green-kerneled glutinous rice cultivar, “aengdongchalbyeo” has been cultivated in the southern coastal area due to its late heading. The seeds of “aengdongchalbyeo”were irradiated with 200 Gy of gamma ray in 1995. A promising mutant variety, “ogwonchalbyeo”(“onnong 17” was selected through line selection and regional yield trials. In particular, the new variety revealed at the earlier mid of August compared to that of “aengdongchalbyeo” the early of September, and it was considerably tolerant to a field lodging due to its shortened culm length. Also, “ogwonchalbyeo”had a higher ripened grain ratio and 1,000 grain weight compared to the original variety. The brown grain yield of the new variety was about 5.40 MT/ha, which was 11.3% higher than that of the original variety, in the regional yield trials at 3 different fields during 2000∼2001. The brown and milled grains of the new rice variety contained 20 to 65% higher amount of total amino acids, respectively than that of the original and two checks. For chlorophyll -a, -b and total chlorophyll, the new variety showed nearly two-fold higher than the checks, and for the carotenoid, it had 5.3 –7.6 times higher amount. These results showed that the new variety can be cultivated as a special green-kerneled glutinous rice with high functional compounds.

“Wonchubyeo” is a new japonica rice (Oryza sativatute (KAERI) and was released in 2004. In order to select the mutants of Chucheongbyeo with god traits, the seds were ira-diated with 250 Gy gama ray (83.3 rad/min) emited from 60Co in a radiation facility

“Woncheongbyeo” is a new japonica rice (Oryza sativa L.) cultivar developed by mutation techniques from Chu-cheongbyeo. Chucheongbyeo seeds were irradiated with 300 Gy gama ray (83.3 rad/min) emitted from 60Co at a radiation facil-ity of the Korea Atomic

Rice and weed interference in the paddy field caused by resource competition and allelopathy. Evaluation method of active weed suppressive behavior of rice to weed was developed by eliminating light competition at soil condition. Twenty eight days old rice seedlings (6-7 leaf stage) which was grown at saturated, no drainage pot were clipped above 3~~4cm from the soil surface. Weeds seeded around clipped rice stem, named ratoon seeding screening method, showed varietal suppressive difference to Echinochloa crus-galli, Echinochloa crusgalli var. praticola and Monochoria vaginalis. Potential allelopathic rice varieties, Sathi, AC1423 and PI312777 showed better suppressive activity to weed seedling growth than Nonganbyeo and Keumobyeo. Weed suppression of one plant of rice cultivars could be evaluated by the cell size of 2.5~times2.5cm at rice clipping of seedling 29 days after rice seeding.