• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 총회 및 춘계학술발표회
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• pp.408-412
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• 2004

A total of 23 springs distributed in the southern and northern sides of Mt. Hala in Jeju Island were seasonally sampled and analyzed for their major ion chemistry and oxygen and hydrogen isotope compositions to investigate their hydrogeochemical and isotopic characteristics. Dissolved ion concentrations of the south-side springs slightly increase with decreasing altitude. This indicates that dissolved ion concentrations of groundwater recharged at higher altitudes increase by water-rock interaction during the downgradient migration of groundwater through highly permeable volcanic aquifer. Dissolved ion concentrations of the north-side springs also slightly increase with decreasing altitude, but dramatically increase at ～300 m.a.s.l. This may indicate a sudden input of contaminants to the north-side groundwater system around ～300 m.a.s.l. Springs located in areas above ～300 m.a.s.l. have very low concentrations of dissolved ions, showing little seasonal variations. Whereas springs located in areas below ～300 m.a.s.l. show a big seasonal variation in the concentration of dissolved ions. Seasonal variation of oxygen isotope compositions of springs is ～3$\textperthousand$ for high-altitude springs (～1700 m.a.s.l.) and is ～2$\textperthousand$ near shore, indicating an attenuation of the variation through mixing with other groundwater bodies during migration.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.299-300
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• 2011

• 동력기계공학회지
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• 제6권4호
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• pp.30-35
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• 2002

This study represents the effects of the material of the air cleaner on the performance in a 4-stroke spark-ignition engine for motorcycles. This study is mainly focused on the possibility of the adopting the STS wire mesh air cleaner of a S.I engine. For investigating the possibility of that, the engine power, the fuel consumption and the exhaust gas analysis were carried out for the synthetic fiber air cleaner and the different size of 200 mesh, 250 mesh, 300 mesh of STS wire mash air cleaner. As the results of this study, the performance of STS wire air cleaner was similar to the fiber air cleaner at 9000 rpm but 300 mesh of STS air cleaner had a high engine power and torque at 9500 rpm. In the case of the synthetic fiber air cleaner the concentration of CO was low at 6500 rpm and in the case of the 300 mesh in STS wire mesh air cleaner the concentration of HC was lowest at all experimental regions.

• 한국진공학회지
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• 제6권1호
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• pp.97-102
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• 1997

이온-고체 표면 사이의 상호작용에 관한 연구를 수행하기 위하여 중 에너지 이온산 란 분광장치를 개발하였고 그 특성 평가를 수행하였다. 제작된 MEIS의 에너지 분해능은 $4\times 10^{-3}$으로 측정되었다. MEIS의 표면분석의 응용으로 60keVH+을 $Ta_2O_5$(300$\AA$)/Si에 적용하 여 에너지 손실인자와 깊이분해능을 얻은 결과는 42eV/$\AA$와 9.7$\AA$이었다. 또한, Si(100)표면 에 97.5KeV$H^+$이온을 random방향으로 입사시켜 이차원 스펙트럼을 얻었다.

• 정보처리학회논문지D
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• 제11D권2호
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• pp.461-470
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• 2004

반도체 업계에서는 200mm 반도체 웨이퍼 생산공정이 300mm 웨이퍼 생산공정으로 바뀜에 따라, 300mm 반도체 웨이퍼를 이동시키는 로봇을 모니터링하고 시뮬레이션하기 위한 소프트웨어 개발이 필요하다. 이런 소프트웨어는 독립적으로 동작하는 것이 아니라 MCS와 하위 시스템인 로봇과 통신하면서 실행되어야 하므로, 그 구성이 복잡하다. 그러므로, 이 시스템을 체계적으로 개발하기 위해서는 객체지향 개발 방법론인 UML을 적용할 필요성이 있다. 본 논문은 반도체 웨이퍼를 생산공정에서 이동시키는 로봇을 모니터링하고 시뮬레이션하기 위한 소프트웨어 개발에 UML 프로세스를 적용하였다. UML을 적용하여 UML을 기반으로 한 개발 프로세스 정의와 개발 단계별 업무들에 대한 구체적인 산출물들을 만들어 내었다.

• 생물환경조절학회지
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• 제22권3호
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• pp.228-233
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• 2013

본 실험은 식물공장시스템에서 인공광원인 백색 LED의 광도와 광주기에 따른 '선홍적축면'의 생육조건을 구명하고자 수행하였다. 그리고 각각의 챔버에 백색 LED를 설치 후 완전임의배치법으로 $20cm{\times}20cm$ 간격으로 재식하였다. 광도는 100, 200, $300{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$로 처리하였고, 광주기는 12/12, 18/6, 24/0(명기/암기)으로 처리하였다. 온도는 $21{\pm}2^{\circ}C$, 상대습도는 $60{\pm}10%$로 조절하여 22일간 재배하였다. 엽폭과 엽장, 생체중과 건물중, 총 안토시아닌 함량은 24/0(명기/암기) 처리에서 좋았다. 최대근장, 생체중과 건물중, 엽수는 100, $300{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$보다 $200{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ 처리에서 좋았다. 엽록소는 광주기 18/6과 24/0 처리 보다 12/12(명기/암기) 처리에서 높았다. 본 실험의 결과로 광도는 200, $300{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, 광주기는 12/12 또는 18/6(명기/암기) 처리를 하는 것이 좋을 것으로 판단된다.

• 한국정보통신학회논문지
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• 제11권12호
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• pp.2343-2351
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• 2007

본 논문은 시변 펄스형 자기장(Time-varying Magnetic field)을 반복적으로 발생시키는 전원장치 및 전원장치에서 발생된 에너지를 자기장으로 발생키시기 위한 자기유도 코일 probe의 설계 및 구현을 통하여 짧은 시간($300{\mu}s$이하) 동안 고자기장(${\sim}1.2Tesla$)을 발생시켰다. 시간과 펄스 주기를 순차적으로 조정 할 수 있는 다단 메쉬 방식으로 설계하여 고반복적($0.1Hz{\sim}20Hz$)으로 스위칭했을 경우에도 동일한 출력세기를 발생시킬 수 있는 자기장 의료기기 시스템을 구현하였다.

• 통합자연과학논문집
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• 제7권1호
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• pp.62-66
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• 2014

This study aims to implement the emergency monitoring robot system which predicts the current state of the patients without visiting the medical institutions by measuring the basic health status of the user's blood pressure, heartbeat, and basic health status of body temperature in the disaster emergency situation based on the Smart Grid. By arranging a large number of sensor(blood pressure, heartbeat, body temperature sensor) and measuring the bio signs, so the attached wireless XBee sensor can be stored in DB of robot, and it aims to draw the current state of the patients by analysis of stored bio data. Among 300 data obtained from the sensor, 1st data to 100th data were used for learning, and from 101st data to 300th data were used for assessment. 12 results were different among the total 300 assessment data, so it shows about 96% accuracy.

• Fisheries and Aquatic Sciences
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• 제13권2호
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• pp.150-156
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• 2010

The separation performance of a low-pressure hydrocyclone (LPH) was evaluated for suspended-solids removal in a recirculating aquaculture system (RAS). The dimensions of the LPH were 335 mm cylinder diameter, 575 mm cylinder height, 60 mm overflow diameter, 50 mm underflow diameter, and $68^{\circ}$ cone angle. The inflow rate varied (400, 600, 800, and 1,000 mL $s^{-1}$) with 25%, 25%, 20%, and 10% of bypass ($R_f$), respectively. The maximum total separation efficiency (Et) and reduced separation efficiency (E't) for suspended solids from the effluent of the second settlement tank (before biofiltration) were 58.9% and 45.2%, respectively, at an inflow rate of 600 mL $s^{-1}$ and 25% of $R_f$. The maximum Et and E't for suspended solids from the water supply channel (after biofiltration) were 24.4% and 16%, respectively, at an inflow rate of 1,000 mL $s^{-1}$ and 10% of $R_f$. The maximum grade efficiency (Ei) was 51.6% for a 300 ${\mu}m$ particle size at an inflow rate of 600 mL $s^{-1}$ with 23% of $R_f$. The maximum reduced grade efficiency (E'i) was 37.6% for a 300 ${\mu}m$ particle size at an inflow rate of 1,000 mL $s^{-1}$ with 11% of $R_f$. The results indicate that the separation performance of the LPH for suspended solids removal was size selective and that maximum removal occurred at particle sizes ranging from 300 to 500 ${\mu}m$.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(3)
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• pp.51-54
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• 2000

In this paper, an compiler system is ported and modified for register allocation experiments. This compiler system will enable various global register allocation. Lcc is introduced and Chaitin's graph coloring algorithm is executed with cmcc on DEC ALPHA 255/300. Several functions of SPEC921NT is used as inputs of the compiler system.