선박용 무선 LAN은 설비의 용이성, 원가절감, 다양한 기능성으로 각광받고 있다. 본 논문에서는 스텝 스터브를 부가하여 2.4 GHz대역과 5.2 GHz대역에서 동작하는 이중 대역통과 필터를 설계하는 방법을 제안한다. 스텝 스터브를 부가한 새로운 형태의 이중 대역통과 필터는 개방 스터브를 부가한 이중 대역통과 필터보다 10 dB 이상 성능이 개선되었고, 기존의 대역통과 필터보다 설계치와 측정치의 오차가 감소됨에 따라 실제 사용할 경우의 성능이 향상되는 효과를 확인하였다. 제작된 이중 대역통과 필터의 설계결과와 측정결과가 거의 일치함을 보임으로써, 본 논문에서 제안한 설계 방법이 타당함을 확인하였다.

The impact of midlatitude synoptic system (upper-level trough) on typhoon intensity change was investigated by analyzing the spatial and temporal characteristics of vertical wind shear (VWS), relative eddy momentum flux convergence (REFC), and potential vorticity (PV). These variables were computed over the radial mean 300~1,000 km from the typhoon center by using GDAPS (Global Data Assimilation and Prediction System) data provided by the Korea Meteorological Administration (KMA). The selected cases in this study are typhoons Rusa (0215) and Maemi (0314), causing much damage in life and property in Korea. Results show that the threshold value of VWS indicating typhoon intensity change (typhoon to severe tropical storm) is approximately 15 m/s and of REFC ranges 6 to 6.5 ms-1day-1 in both cases, respectively. During the period with the intensity of typhoon class, PVs with 3 to 3.5 PVU are present in 360K surface-PV field in the cases. In addition, there is a time-lag of 24 hours between central pressure of typhoon and minimum value of VWS, meaning that the midlatitude upper-level trough interacts with the edge of typhoon with a horizontal distance less than 2,000 km between trough and typhoon. That is, strong midlatitude upper-level divergence above the edge of the typhoon provides a good condition for strengthening the vertical circulation associated with the typhoons. In particular, when the distance between typhoon and midlatitude upper-level trough is less than 1,000 km, the typhoons tend to weaken to STS (Severe Tropical Storm). It might be mentioned that midlatitude synoptic system affects the intensity change of typhoons Rusa (0215) and Maemi (0314) while they moves northward. Thus, these variables are useful for diagnosing the intensity change of typhoon approaching to the Korean peninsula.

The characteristics of meteorological conditions relevant to Asian dust (AD) outbreaks and their occurrence frequencies were analyzed in four source regions (R1 to R4) during spring months (March to May) of 1998-2002. Moreover, the concentration variations of AD (e.g., PM10) observed in Korea were investigated during the study period. In the relationship between AD outbreaks and three meteorological parameters (i.e., air temperature, wind speed, and aridity), the largest AD outbreaks in April (～250 observations) mostly occurred in R2 when air temperature ranging from 10.0 to 15.0℃ and surface wind speed from 7 to 9 m s-1 were recorded. Moreover, the aridity (≥ 4) in April was significantly high in R2 with the maximum frequency of AD outbreaks (i.e., 206 observations). On the other hand, the number (percentage) of days belonging to AD events observed in five Korean cities were found to be 116 (44%), 121 (46%), and 26 days (10%) in March, April, and May, respectively. The mean PM10 concentrations were found to range from 150 to 220, 150 to 200, and 95 to 120 ㎍ m-3 in March, April, and May, respectively. Consequently, this implied that the AD events in Korea were found to be gradually frequent in early spring and to be affected from the large AD outbreaks observed in the source regions.

The genetic base was defined as the ancestral pool from which crop varieties were derived, and was used to characterize genetic diversity in crop breeding. Number of primary parents used between 1913 and 2002 in Korean soybean breeding programs was 65 and

쌀에 존재하며 토양미생물인 Pseudomonas putida 21025를 미강에 배양하여 생성되는 bacteriocin을 미강 필름에 첨가하여 미강필름의 저상성향상을 조사하였다. Pseudomonas putida 21025를 접종한 미강 액체배지는 초기배지 pH 6.48로 자연그대로의 미강 액체배지를 이용하여 항온 배양기에 3, 150 rpm으로 33시간 배양하여 bacteriocin을 생성하였다. bacteriocin 첨가 후, 필름 가공시에는

2002년도 국내에서 실시된 가축의 수정란이식 현황을 파악하기 위하여 전국의 수의ㆍ축산분야의 대학, 국ㆍ공립 축산관련 연구소, 농업기술센터, 가축인공수정소 및 동물병원 등의 168개 관련기관에 2002년 1월 1일부터 12월 31일까지 소, 돼지 및 기타 동물의 수정란 생산, 이식 및 임신진단 결과에 대하여 설문서를 통하여 조사하였으며, 설문서를 작성하여 제출한 32개기관의 자료를 분석한 결과는 다음과 같다. 가축의 수정란이식을 실시하고 있는 기관은 국

Chomsky (2000) proposes that the operation Attract-F of Chomsky (1995) be replaced by the operation Agree, in which there is, in principle, no movement at all. In the Agree theory, agreement between a Probe P and its Goal G can lead to feature checking in situ. Lasnik (2002), however, argues that feature movement (or attract) is to be preferred to agreement at a distance, presenting three pieces of evidence: pseudo-gapping, sluicing, and remnant movement. The purpose of this article is to show that the agreement-at-a-distance theory of Chomsky (2000) can still be maintained if we adopt Pesetsky and Torrego`s (2001) conception of the EPP property as a "subfeature of a feature." Furthermore, if we assume Boeckx and Stjepanovic´`s (2001) claim that head movement is a PF phenomenon, the persuasiveness of Lasnik`s (2002) argument becomes even weaker. Following Chomsky`s (2001b) assumption that internal Merge can apply either before or after Spell-Out, I have demonstrated that even the remnant movement phenomenon, the most powerful piece of evidence for Lasnik`s (2002) argument, can naturally be accounted for with the feature checking in situ of the Agree theory.