• 한국컴퓨터산업학회논문지
• /
• 제4권10호
• /
• pp.587-598
• /
• 2003

본 연구에서는 학술논문을 대상으로 하여 표제와 초록에 대한 2단계 색인어 유사관계행렬을 구축하였다. 동시출현빈도 기반으로 구축된 색인어 유사관계행렬은 호환관계에 따른 질의 확장으로 재현률을 유지하면서 2단계 내용기반 검색으로 정확률을 향상시키기 위한 색인구조이다. 따라서, 주제 분석을 통해 영역지식을 추출하고 이용자의 정보 요구와 영역지식을 퍼지논리 기반으로 추론하였다. 본 연구는 질의에 본질적으로 가지고 있는 용어 불일치 및 정보표현을 향상시키기 위한 연구이다.

• Journal of Microbiology and Biotechnology
• /
• 제25권6호
• /
• pp.845-855
• /
• 2015

The present study describes the gene cloning and high-level expression of an alkaline and thermostable lipase gene from Trichosporon coremiiforme V3. Nucleotide analysis revealed that this lipase gene has an open reading frame of 1,692 bp without any introns, encoding a protein of 563 amino acid residues. The lipase gene without its signal sequence was cloned into plasmid pPICZαA and overexpressed in Pichia pastoris X33. The maximum lipase activity of recombinant lipase was 5,000 U/ml, which was obtained in fed-batch cultivation after 168 h induction with methanol in a 50 L bioreactor. The purified lipase showed high temperature tolerance, and being stable at 60℃ and kept 45% enzyme activity after 1 h incubation at 70℃. The stability, effects of metal ions and other reagents were also determined. The chain length specificity of the recombinant lipase showed high activity toward triolein (C18:1) and tripalmitin (C16:0).

• 한국환경농학회지
• /
• 제20권5호
• /
• pp.305-309
• /
• 2001

Thirty-day-old rice seedlings, IR-20 variety were transplanted into the experimental plots and were sprayed with endosulfan (35% EC) after 52 days at the rate of 0.64 kg a.i/ha. Residues of endosulfan in the plant, soil, and water were found to decrease steadily upto 15 days. A second application of the pesticide was made on the 31st day and the plant was harvested on 56th day after the first application. The residue level on hay and grains was 0.7 ${\mu}g/g$. This level is seven times higher than FAO/WHO-prescribed tolerance level of 0.1 ${\mu}g/g$. Metabolites of endosulfan were traced out in plants, soil, and water during the pre- and post-harvest period.

• Natural Product Sciences
• /
• 제15권1호
• /
• pp.8-11
• /
• 2009

Blood glucose lowering effects of water extracts from four species of Commelinaceae(Commelina communis, Streptolirion volubile, Tradescantia reflexa, Aneliema keisak) were determined on alloxan-induced hyperglycemic rats. In all the experimental groups, the blood glucose level decreased after loading carbohydrates. The blood glucose level in a group treated with C. communis extract decreased significantly as compared with the normal group. After loading maltose and sucrose separately in different groups, the blood glucose level decreased in the groups treated with the extracts of C. communis and S. volubile, and remained approximately unchanged with the extracts of T. reflexa and A. keisak as compared with the control groups.

• 한국자동차공학회논문집
• /
• 제7권8호
• /
• pp.208-215
• /
• 1999

Using the orthogonal arrays and the occupant analysis software based on the multi-body dynamics , two interactive design algorithms are proposed to improve the initial design of the occupant protection systems. Algorithm 1 sequentially moves the narrow design space within the upper and the lower design limit. Algorithm 2 sequentially reduces the relatively wide design space. Each design algorithm is composed of two levels . The first level is to improve the characteristics of the crash performance considering the noise factors. In order to obtain the robust design, the second level reduces the variations the noise factors. In order to obtain the robust design, the second level reduces the variations due to the tolerance of the design variable. To utilize the algorithm 1, HIC(Head Injury Criterion) , 3 msec criterion value of the chest acceleration and the femur load decreased by 27.4%, 10.4% and 55.8%, respectively. To utilizer the algorithm 2 , the results decreased by 38.0%, 10.5% and 3.0% , respectively.

• 항공우주시스템공학회지
• /
• 제3권2호
• /
• pp.31-38
• /
• 2009

COMS On-board FDIR(Failure Detection, Isolation and Recovery) functions are implemented on the on-board software to satisfy the autonomy and failure tolerance requirements. This paper presents concepts of COMS Failure Management with hierarchical layers and addresses the characteristics of the FDIR layer from low level to high level. It is aimed at giving the reader the understanding how the COMS FDIR was designed and how works. It first recalls what are the system level applicable requirements, which are based on the COMS mission requirements. Then it describes the philosophy and structure of the FDIR and subsequently breaks it down into the several FDIR layers. It could be used as an important and useful reference of the information to design and develop an automatic FDIR mechanism in the future.

• 한국조경학회지
• /
• 제22권1호
• /
• pp.101-110
• /
• 1994

A field study was carried out to investigate the visual injury of zoysiagrass and creeping bentgrass by the application of various herbicides the result were as follows. 1. Trifluralin + benefin and dithiopyr did not injure creeping bentgrass and zoysiagrass. 2. Creeping bentgrass was safe while zoysiagrass was slightly injured within acceptable level with benefin. 3. Oryzalin caused injury both on creeping bentgrass and zoysiagrass. However, the injury of zoysigrass was within acceptable level while the injury of creeping bentgrass increased without acceptable level when applied at>5kg/ha. 4. Creeping bentgrass was tolerant to pendimethalin only when treated at<3.4kg/ha whereas zoysiagrass was tolerant regardless of rate. 5. Creeping bentgrass treated with fenoxaprop, oxadiazon, and bensulide were severely injured. However, turfgrasses treated with bensulide recovered rapidly when compared with fenoxaprop and oxadiazon. 6. Zoysiagrass treated with 2,4-D, dicambe, bentazon was safe when applied at mid summer.

• Communications for Statistical Applications and Methods
• /
• 제17권3호
• /
• pp.319-326
• /
• 2010

In this paper, a new group sampling plan for the lot acceptance is proposed for the time truncated life test, which can be utilized when multi-item testers are implemented. The design parameters are found using the two-point approach such that the producer's and consumer's risks are satisfied simultaneously at the acceptable reliability level and the lot tolerance reliability level, respectively. The case of Weibull distribution is described to illustrate the procedure that can be used when the quality level is expressed by a multiple of the specified life. The advantage of the proposed plan is demonstrated by comparing with the existing plan in terms of the sample size required. The tables are constructed and some examples are given to illustrate the procedure developed here.

• 환경생물
• /
• 제40권3호
• /
• pp.247-254
• /
• 2022

본 연구는 자연에서 채집한 불볼락(Sebastes thompsoni)을 대상으로 고 수온 노출에 따른 생물의 행동반응 및 내성 한계(tolerance limit)를 규명하기 위하여 연속적으로 행동관찰이 가능한 추적시스템을 사용하여 노출 수온구간별 행동패턴의 변화, 임계 수온범위 및 아치사 행동반응을 분석하였다. 실험 결과, 대조수온(15.0℃)을 20.0℃로 높였을 때, BI (behavioral index)는 노출 초기 10시간 동안 일시적으로 증가하였으나 60~70시간 동안 뚜렷한 행동의 변화 없이 일정한 속도로 안정된 유영 패턴을 보였다. 그러나, 25℃에서는 활동량의 급격한 저하, 30℃에서는 활동성 지연과 정지행동 등과 같은 비정상적 유영 및 대사활동 교란이 확인되었으며, 온도의 상승에 따라 개체의 사망률이 높아지는 경향을 보였다. 이러한 결과는, 불볼락의 수온에 대한 내성한계는 25.0~30.0℃이며 생존에 큰 영향을 미치는 수온은 30.0℃ 부근임을 나타낸다. 본 연구의 결과가 효과적인 불볼락의 양식을 위한 환경 조건 설정에 도움을 줄 것으로 기대한다.

• 한국노년학
• /
• 제28권4호
• /
• pp.953-968
• /
• 2008

본 연구는 노인들을 대상으로 노후불안 수준이 어떠한지 알아보며, 규칙적인 체육활동을 실시하기 전과 후의 노후불안 수준을 파악할 것이며, 구체적으로 노후불안 수준이 체육활동을 통해 얼마큼 감소되는지 밝혀내는데 본 연구의 목적이 있다. 본 연구의 대상은 서울, 경기 지역에 위치한 L노인대학, S노인대학, J노인대학, Y(a)노인대학, Y(b) 노인대학, D노인대학에 체육활동 강좌(건강체조, 게이트볼, 스포츠댄스) 수강생을 모집단으로 선정하였으며, 비확률표집방법(nonprobability)의 편의표본추출법(convenience sampling)을 이용하여 총 200명을 연구대상자로 선정하였다. 조사대상자의 연령을 고려하여, 직접 기입방법과 일대일 면접법을 병행하여 총 200부의 자료를 수집하였다. 자료처리는 SPSS 12.0 Version통계 패키지를 이용하였으며, 모든 통계치의 유의 수준은 .05로 정하였다. 분석방법은 빈도분석(Frequency Analysis), 대응표본 t-test (Paired t-test), 독립표본 t-test(Independent t-test)를 실시하였다. 노인들이 규칙적인 체육활동을 실시하기 전과 후의 노후불안 인식수준의 차이를 분석한 결과, 노후불안은 4가지 요인으로 구분된다. 첫째, 체육활동 실시 전 상실에 대한 두려움은 (M=3.756), 실시 후에는 (M=1.942)으로 나타났다. 둘째, 노인에 대한 두려움은 체육활동 실시 전 (M=3.443), 실시 후 (M=2.243)으로 나타났다. 셋째, 신체적 외모에 대한 걱정에서는 체육활동 실시 전 (M=3.253), 실시 후 (M=2.310)으로 나타났다. 마지막 요인인 심리적 불안정 요인에서는 체육활동 실시 전 (M=3.060), 실시 후 (M=1.666)으로 나타났으며, 모든 요인이 유의수준 .001에서 통계적으로 유의한 차이가 나타났으며, 전체적인 요인 모두 사전테스트 전 보다 노후불안점수가 낮게 나타나 체육활동이 노인의 불안수준을 낮추는 것으로 나타났다.