• 한국식품영양학회지
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• 제31권2호
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• pp.272-277
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• 2018

This research was conducted to elucidate the optimum conditions for the antibacterial activity of konjak jelly using the evolutionary operation-factorial design technique. In the first set of experiments, concentration of a coagulation agent, soaking liquid, and temperature of water were set to 0.4%, $0.6{\times}10^{-2}N$, and $65^{\circ}C$ as a central point, respectively. The highest antibacterial activity was acquired at E21, in which the number of bacteria was 1.25 log cfu/g. Because the code of changes in the main effect was (-), it could be decided that the central point of the first set was not the optimum point. Although antibacterial activity in the second set was improved, the values of the main effect were higher than that of changes in the mean effect. The central point of third set was concentration of coagulation agent 0.8%, concentration of soaking liquid $1.0{\times}10^{-2}N$, and temperature of water $65^{\circ}C$. It was found that the antibacterial activity of central point in the third set was highest among all the tested set. Further, all the necessary conditions were appropriate to reach the optimum condition. The antibacterial activity of the central point in third set was more than 1,000 times higher than that of E11, in first set.

• 한국추진공학회지
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• 제24권5호
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• pp.34-42
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• 2020

현대 항공전에서 적외선 신호는 상대방 탐지에 있어 중요한 역할을 하며, 생존성 및 스텔스성 향상을 위해 저감되어야 한다. 특히 항공기 엔진 후류에서 발생하는 적외선 신호는 높은 강도를 가지며 파장이 짧아 대부분의 열 추적 미사일이 이러한 신호를 따라 탐지하게 된다. 이에 따라 본 연구에서는 엔진 후류에서 발생하는 Gas radiation 신호 측정 및 특성 분석을 수행하였다. 실제 항공기 터보팬 엔진을 모사하기 위해 마이크로 터보제트 엔진을 구성하였으며, 바이패스 비 조절을 통한 적외선 신호 저감 특성을 파악하였다. 이를 통해 각 파장 별 적외선 신호 특성을 분석하고 신호 저감 기술들에 대한 검증을 수행한다.

• 통상정보연구
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• 제10권4호
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• pp.221-250
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• 2008

This study investigated and analyzed the export competitiveness of Gyeonggi-Do and the effect of Korea-US FTA on its export competitiveness. By reviewing the current status of trade structure and implementing trade specialization index(TSI) of export commodities of Gyeonggi-Do, the investigation has listed the specific export commodities with competitiveness for increasing the volume of its export in the United States, in the short, mid and long run perspectives. From the findings in this study, it suggests specific trade and commercial policies to Korea-US FTA including implementing commodity-oriented export supporting system, strategic marketing method, economic-free-zone plan, R&D investment, export financing and regional economic cooperation.

• KSTLE International Journal
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• 제1권1호
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• pp.43-47
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• 2000

Oil seals will experience a small amplitude dynamic excitation due to the shaft eccentricity as well as out-of-roundness of the shaft. The direct integration method is selected to analyze the time domain response of the seal lip-shaft contact. The physical properties of rubber seal materials are experimentally analyzed. Effects of both frequency and temperature on the material stiffness behavior are investigated for the linear viscoelastic materials of the seal. Using the nonlinear transient model, a finite element analysis of the lip-shaft contact behaviors under dynamic conditions is presented as a function of the shaft eccentricity, the shaft interference and the garter spring stiffness. The FEM results based on the experimental data indicate that the increased rotating speed may produce the separation conditions. These results will be very useful in predicting the leakage of oil seals under dynamic conditions.

• 아시안잔디학회지
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• 제8권3호
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• pp.179-192
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• 1994

Much attention has been paid recently to environmental destruction by golf course constructions in Koera. An efficiency and up-to-date technology on the planning and design practices has been requested to minimize the environmental impacts. Computerized systems for golf course design in the point of physical conservation of environment were discussed here. Geograpic Information System were applied on the process of geograpical data input and analysis through the final outputs, Simulation works by the total database management make enable to pre-investigate of the design in view of an assessment of environment impacts. It is also possible to evaluate plans easily and propose the alternatives properly. Precise quantity caculation of en-gineering works by computer system should be guarantee scientific, economic, and environme-ntally sound golf course design.

• Animal Systematics, Evolution and Diversity
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• 제8권2호
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• pp.301-324
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• 1992

제주도 연안과 부근 섬을 1991년 3월 부터 10월까지 5회에 걸쳐 채집한 재료와 그동안 한남대학교 생물학과와 이화여자대학교 생물학과에 보관되어 있던 제주도 표본들을 동정. 분류한 결과 30 과 40 속 67 종이 분류 되었고, 이 중 11 종은 한국미기록종이었다. 특기를 요하는 기록종에는 간단한 기재를 하였고, 미기록종에 대하여는 기재와 도판을 첨가 하였다.

• Animal Systematics, Evolution and Diversity
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• 제38권1호
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• pp.1-13
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• 2022

Three Pleuromamma copepods were newly collected from the South Sea of Korea in the summer when the Tsushima Warm Current was strong. They were identified as Pleuromamma abdominalis(Lubbock, 1856), P. indica Wolfenden, 1905, and P. xiphias (Giesbrecht, 1889). Although these species have been reported in world oceans, they were first reported from Korean waters. So far, four species of Pleuromamma (P. borealis Dahl, 1893, P. gracilis Claus, 1863, P. piseki Farran, 1929, and P. robusta (Dahl, 1893)) have been recorded in Korean waters. We provided re-description of these three species insufficiently described by previous authors and key characters for species identification in addition to species hitherto known in Korea.

• 대한음성학회:학술대회논문집
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• 대한음성학회 2000년도 7월 학술대회지
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• pp.165-165
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• 2000

In the phoneme level, English stop sounds are classified with the feature of 'voicing': voiceless and voiced (p/b, t/d, k/g). But when realized, a voiceless stop is not alwats the same sound. For example, the two 'p' sounds in 'people' are different. The former is pronounced with much aspiration, while the latter without it. This allophonic differnece between [$P^h$] and [p] out of an English phoneme /p/ can be well explained to Koreans because in Korean these two sounds exist as two different phonemes {/ㅍ/ and /ㅃ/ respectively). But difficulties lie in teaching the English voiced stop sounds (/b, d, g/) to Koreans because in Korean voiced stops do not exist as phonemes but as allophones of lenis sounds (/ㅂ, ㄷ, ㄱ/). For example, the narrow transcription of '바보' (a fool) is [baboo]. In the word initial position, Korean lenis stops are pronounced voiceless and even with a slight aspiration while in the inrervocalic environments they become voiced, That is in Korean voiced stops do not occur independently and neither they have their own letters. To explain all these more effectively to Koreans, it is very helpful to use Korean Phenetic Alphabet (KPA) which is devised by Dr. LEE Hyunbok (a professor of phonetics at Seoul National Univ. and chairman of Phonetic Society of Koera.)(omitted)

• Journal of Korean Society for Atmospheric Environment
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• 제18권E3호
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• pp.129-142
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• 2002

This paper provides a long-term perspective for ozone concentrations at 20 national air quality monitoring sites in Seoul from 1989 to 1998, which were managed by the Korean Ministry of Environment. Ozone episodes occurred more frequently in the east areas (Bangi, Guui, Seongsu, and Ssangmun) than in the west area (Guro and Oryu). When an ozone episode happened, hourly ozone concentrations over 80 ppb continued for an average of 4.0 hours at all sites. Annual variations in daily mean and maximum oBone concentrations showed broadly consistent upward trends at Ssangmun and Gwanaksan. Monthly mean ozone concentrations were the highest from May to June and the 99$^{th}$ and 95$^{th}$ percentile levels appeared higher during June, July, and August. The diurnal patterns of hourly mean ozone levels in urban areas showed typical photochemical formation and destruction, while the flat diurnal shape before 1996 at Gwanaksan indicated few significant photochemical reactions due to a lack of precursors of ozone. The occurrence of ozone over 80 ppb was ascribed to meteorological conditions such as high temperature, strong solar radiation, low relative humidity, and low wind speed with winds most frequently in a westerly direction.

• 한국통신학회논문지
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• 제40권3호
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• pp.478-490
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• 2015

정보화 시대에 도래함에 있어서 많은 양의 데이터가 인터넷 상에 쌓이게 되었다. 이러한 정보를 공유하기 위해 유무선 네트워크를 통해서 데이터를 전달하고자 하는 요구가 증대되었다. 특히, 베터리 기반으로 동작하는 모바일 장치를 사용하는 무선 네트워크에서는 많은 양의 데이터 업로드, 다운로드로 인해서 에너지 소모가 많이 발생하였다. 이와 같은 문제를 해결하기 위해서 본 논문에서는 대부분 네트워크 프로토콜 동작에서 사용되는 전송계층인 TCP 혼잡제어 방법을 수정하여 에너지를 절감해 보고자 한다.