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A Study on High-resolution Numerical Simulation with Detailed Classification of Landuse and Anthropogenic Heat in Seoul Metropolitan area (수도권지역의 지표이용도 및 인공열 상세적용에 따른 고해상도 수치실험 연구)

  • Lee, Hankyung;Jee, Joon-Bum;Min, Jae-Sik
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.19 no.4
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    • pp.232-245
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    • 2017
  • In this study, the high-resolution numerical simulation results considering landuse characteristics are analyzed by using single layer Urban Canopy Model (UCM) in Weather Research Forecast (WRF). For this, the impact of urban parameters such as roughness length and anthropogenic heat in UCM is analyzed. These values are adjusted to Seoul metropolitan area in Korea. The results of assessment are verified against observation from surface and flux tower. Forecast system equipped with UCM shows an overall improvement in the simulations of meteorological parameters, especially temperature at 2 m, surface sensible and latent heat flux. Major contribution of UCM is appreciably found in urban area rather than non-urban. The non-urban area is indirectly affected. In simulated latent heat flux, applying UCM is possible to simulate the change similarly with observations on urban area. Anthropogenic heat employed in UCM shows the most realistic results in terms of temperature and surface heat flux, indicating thermodynamic treatment of UCM could enhance the skills of high resolution forecast model in urban and non-urban area.

An Analysis of High School Korean Language Instruction Regarding Universal Design for Learning: Social Big Data Analysis and Survey Analysis (보편적 학습설계 측면에서의 고등학교 국어과 교수 실태: 소셜 빅데이터 및 설문조사 분석)

  • Shin, Mikyung;Lee, Okin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.1
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    • pp.326-337
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    • 2020
  • This study examined the public interest in high school Korean language instruction and the universal design for learning (UDL) using the social big data analysis method. The observations from 10,339 search results led to the conclusion that public interest in UDL was significantly lower than that of high school Korean language instruction. The results of the Big Data Association analysis showed that 17.22% of the terms were found to be related to "curriculum." In addition, a survey was conducted on a total of 330 high school students to examine how their teachers apply UDL in the classroom. High school students perceived computers as the most frequently used technology tool in daily classes (38.79%). Teacher-led lectures (52.12%) were the most frequently observed method of instruction. Compared to the second-year and third-year students, the first-year students appreciated the usage of technology tools and various instruction mediums more frequently (ps<.05). Students were relatively more positive in their response to the query on the provision of multiple means of representation. Consequently, the lesson contents became easier to understand for students with the availability of various study methods and materials. The first-year students were generally more positive towards teachers' incorporation of UDL.

인터넷 기반 원스톱서비스 시스템 개발에 관한 연구+ -수출컨테이너화물 원스톱서비스 시스템 개발-

  • 박남규;최형림;김현수;박영재;조재형;이철우
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 1999.10a
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    • pp.299-308
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    • 1999
  • 오늘날 우리 나라가 당면한 최우선 경제과제중 하나는 물류부분의 혁신을 통한 국가경쟁력 강화라고 할 수 있으며, 이를 위해 정부도 1993년 물류체계 개선을 위한 장기구상으로 ‘화물유통체계 개선 10개년 기본계획’을 수립하여 적극 추진 중에 있다. 그러나 이러한 노력에도 불구하고 PORT-MIS사용자를 상대로 한 설문조사에서는 선박입출항 업무 관련 서류의 40%, 항만시설 사용 업무와 관련된 서류의 31%, 하역업무 관련 서류의 10%만이 EDI를 활용하고 있었다. EDI 활용이 저조한 사유로는 전송시간이 많이 걸리며, EDI 소프트웨어가 작동되지 않으며, 수신확인이 되지 않기 때문이라 응답을 하였다. 이처럼 오늘날 항만물류산업이 겪고 있는 물류 데이터 흐름이 단절적 현상은 시간이 흐를수록 해결 될 기미가 보이고 있지 않다. 따라서 본 논문에서는 우리 나라가 겪고 있는 물류관련 업무를 한번의 데이터 입력으로 해결할 수 있는 원스톱 서비스 시스템개발을 목표로 우선 PORT-MIS EDI 업무를 처리할 수 있는 시스템을 구축하였다. 이는 향후 화주, 운송사, 선사, 포워더, 창고업자,하역회사, 철도청, 화물터미널, 컨테이너 터미널, 해양수산청, 관세청, 출입국관리사무소, 검역소 사이에 서로 교환되는 적하목록, Booking List, 컨테이너 Pick up정보, 위험물 정보, COPINO 정보를 비롯하여 대 관세청 신고 등 수출컨테이너 화물업무의 전반적인 영역으로까지 쉽게 확대할 수 있을 것이다. 본 연구결과 구축된 시스템은 원천정보를 중앙의 통합데이터베이스에 저장하여 이를 사용자의 요구에 의해 인터넷을 통해 전달하는 FTP와 웹 EDI 방식을 결합한 하이브리드 형태이다.CS Cell 방식에 의한 위치결정방식을 채택하였는데, 이것은 PCS망을 기반으로 데이터를 주고받이며 인터넷 단말기로 확장 가능한 PCS 단말기를 사용해서 위치추적을 하는 시스템이다. 이러한 시스템을 선정하게된 배경은 단말기아 망 이용료의 가격이 저렴하여 현실적으로 트럭이 쉽게 부착할 수 있다는 장점이 있으며 나아가 인터넷 단말기를 활용하여 차량과 관제센터사이에 메시지 전송 등 부가적인 서비스가 가능하기 때문이다.비교한 결과 토사 유출 억제효과는 한지형과 나지형잔디들의 혼합형(MixtureIII)과 자생처리구(MixtureV), Italian ryegrass와 자생식물의 혼합형(MixtureIV)등에서 비교적 낮은 수치를 토사유출량을 기록하였다. 이러한 결과는 자생식물들이 비록 초기생육속도는 외래도입초종에 떨어지지만 토사유출의 억제효과면에서는 이들 외래초종에 필적할 수 있음을 나타낸다고 할 수 있겠다.중량이 약 115kg/$m^2$정도로 나타났다.소 들(환경의 의미, 사람의 목적과 지식)보다 미학적 경험에 주는 영향이 큰 것으로 나타났으며, 모든 사람들에게 비슷한 미학적 경험을 발생시키는 것 이 밝혀졌다. 다시 말하면 모든 사람들은 그들의 문화적인 국적과 사회적 인 직업의 차이, 목적의 차이, 또한 환경의 의미의 차이에 상관없이 아름다 운 경관(High-beauty landscape)을 주거지나 나들이 장소로서 선호했으며, 아름답다고 평가했다. 반면에, 사람들이 갖고 있는 문화의 차이, 직업의 차 이, 목적의 차이, 그리고 환경의 의미의 차이에 따라 경관의 미학적 평가가 달라진 것으로 나타났다.corner$적 의도에 의한 경관구성의 일면을 확인

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RFID Tag Identification with Scalability Using SP-Division Algorithm on the Grid Environment (그리드 환경에서 SP분할 알고리즘을 이용한 확장성 있는 RFID 태그 판별)

  • Shin, Myeong-Sook;Ahn, Seong-Soo;Lee, Joon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.10
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    • pp.2105-2112
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    • 2009
  • Recently RFID system has been adopted in various fields rapidly. However, we ought to solve the problem of privacy invasion that can be occurred by obtaining information of RFID Tag without any permission for popularization of RFID system To solve the problems, it is Ohkubo et al.'s Hash-Chain Scheme which is the safest method. However, this method has a problem that requesting lots of computing process because of increasing numbers of Tag. Therefore, We suggest the way (process) satisfied with all necessary security of Privacy Protection Shreme and decreased in Tag Identification Time in this paper. First, We'll suggest the SP-Division Algorithm seperating SPs using the Performance Measurement consequence of each node after framing the program to create Hash-Chain Calculated table to get optimized performance because of character of the grid environment comprised of heterogeneous system. If we compare consequence fixed the number of nodes to 4 with a single node, equal partition, and SP partition, when the total number of SPs is 1000, 40%, 49%, when the total number of SPs is 2000, 42%, 51%, when the total number of SPs is 3000, 39%, 49%, and when the total number of SPs is 4000, 46%, 56% is improved.

Inorganic Electro-luminescence Device Fabricated with $BaTiO_3$-PVDF Composite Film ($BaTiO_3$-PVDF 복합체로 제작한 무기 EL 소자)

  • Son, Yong-Ho;Jeong, Joon-Seok;Jo, Chan-Woo;Woo, Duck-Hyun;Kim, Young-Min;Kim, Sung-Jin;Yoon, Man-Soon;Ryu, Sung-Lim;Kweon, Soon-Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.299-299
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    • 2007
  • 후막형 무기 EL (electro-luminescence) 소자는 제조공정이 간단하고, 얇고, 가볍고, 유연한 동의 많은 장점들 때문에 휴대폰의 키패드 (key-pad) 및 광고용 back-light용으로 사용되고 있다. 이 무기 EL 소자는 비교적 손쉬운 스크린 프린팅 (screen-printing) 법으로 대면적을 제작할 수 있지만, LED (light emitting diode) 등과 비교하여 밝기가 낮아서 그 응용 분야가 제한되고 있다. EL 소자의 형광층은 전면 전극과 후면 전극 사이에 위치한다. EL은 이 형광층에 고 전기장이 걸릴 때, 전기장에 의해 가속된 전자가 형광층 내부에 첨가된 발광 중심의 전자를 여기시키고, 여기된 전자가 다시 바닥상태로 완화될 때 빛이 방출되는 현상이다. 즉, EL 소자는 이러한 전자 발광 현상을 이용한 소자로서, 전압 인가 시 발광 면 전체가 균일하게 발팡하는 평면 광원이다. 이러한 EL 소자에서 휘도의 증가는 후면 전극과 형광층 사이에 삽입되는 유전체 층의 특성과 밀접한 연관성이 있다. 본 연구에서는 고휘도 무기 EL 소자를 제작하기 위하여 이 유전체 층의 특성과 소자의 성능 사이의 관계를 알아보고자 하였다. 유전체 층에 사용하기 위해서 $BaTiO_3$-PVDF (polyvinylidene fluoride)의 복합체 필름을 제조하였다. 먼저 이 복합체 필름을 스크린 프린팅 (screen printing) 법으로 코팅하기 위한 페이스트 제작을 위해서, PVDF 수지를 용제에 녹였다. 그 다음, 일반 혼합기 및 삼단 롤밀 혼합기 (3-roll milling mixer) 등을 이용하여 $BaTiO_3$ 분말과 PVDF 용액을 다양한 비율로 혼합하여 페이스트를 제조하였다. ITO가 증착된 PET Film에 스크린 프린팅 법을 사용하여 형광층, 유전층, 배면 전극 등을 차례로 코팅하였다. $BaTiO_3$ (BT) 분말과 복합체 필름의 XRD 분석 결과, 분말 시료와 복합체 시료 모두 페로브스카이트 구조의 BT 회절선만 관찰되었다. 복합체의 단면 SEM 관찰에서는, BT 분말의 무게비가 증가할수록 더 치밀한 구조를 보여줌을 확인하였다. 또 EL소자의 유전상수와 휘도도 BT 분말의 혼합비가 증가할수록 증가하였다. 본 연구에서 제작한 무기 EL 소자의 최대 휘도는 약 $130\;cd/m^2$ 정도로 측정되었는데, 이는 휴대폰 키패드의 back-light용 광원으로 사용하기 충분하다고 판단되어진다.

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A Study on the Formation of Hydrate Plugging due to water molecules in High Pressure and Low Temperature Gas Pipeline (고압$\cdot$저온 가스 배관에서 수분에 의한 하이드레이트 플러깅 형성)

  • Lee J. H.;Baek Y. S.;Sung W. M.
    • Journal of the Korean Institute of Gas
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    • v.6 no.1 s.17
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    • pp.38-45
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    • 2002
  • Hydrates are solid cryctallines resembling ice in appearance, which are consist of a gas molecule surrounded by a cage of water molecules. Because of containning a large amount of methane, hydrates have been considered as a future energy resource. However, the formation of hydrates in the oil and gas industries has been known as a serious problem for a long time. The formation of hydrate in pipeline is common in seasonally cold or sub-sea environments with low temperatures and high pressures. Especially, hydrate plug formation becomes a real menace to flow assurance in inadequately protected transmission lines. This study was carried out for the purpose of understanding mechanism of hydrate plugging and examining formation conditions of hydrate in high pressure gas pipeline. In this study, we measured hydrate equilibrium conditions under the various flowing conditions with the methane. The results were presented both the plugging tendency and the effect of flowing velocity.

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The Effect of Stress on SCC of Heat Exchanger Tube for LNG Vessel (LNG선박용 열교환기 세관의 SCC에 미치는 응력의 영향)

  • Jeong Hae Kyoo;Lim Uh Joh
    • Journal of the Korean Institute of Gas
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    • v.7 no.2 s.19
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    • pp.22-32
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    • 2003
  • Al-brass material is generally used at the state of plastic deformation, for example; bending, extension of bell mouth at shell and tube type heat exchanger. And SCC(stress corrosion cracking) of Al-brass material will be affected by residual stress as plastic deformation. SCC results from synergism between mechanical factor and corrosion environment. Mechanical factor is stress that directly relates with stress intensity factor at the crack tip. This paper was studied on the effect of stress on SCC of Al-brass tube under in $3.5\%$ NaCl. + $0.1\%\;NH_4OH$ solution by constant displacement tester. Increasing of acidified water flow into sea and speeds up corrosion rate of Al-brass which is used as a tube material of vessel heat exchanger by polluted coast seawater. The experimental results are as follow The latent time of SCC occurrence gets longer as the initial stress intensity factor($K_{Ii}$) gets lower The main crack was propagated as the initial stress intensity factor($K_{Ii}$) gets higher, and secondary cracks occurred by electro-chemical factor a(ter stage of released stress. Dezincification phase showed around the crack, and the range of dezincification gets wider as the initial stress intensity factor($K_{Ii}$) gets higher.

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Identification and Characterization of Aspergillus oryzae Isolated from Soybean Products in Sunchang County (순창군 장류로부터 분리된 황국균의 동정 및 특성)

  • Lim, Eunmi;Lee, Ji Young;Elgabbar, Mohammed A. Abdo;Han, Kap-Hoon;Lee, Bo-Soon;Cho, Yong Sik;Kim, Hyoun-Young
    • The Korean Journal of Mycology
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    • v.42 no.4
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    • pp.282-288
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    • 2014
  • In this study, we attempted to isolate fungi from soybean fermented foods produced in Sunchang County and to identify Aspergillus oryzae from fungal isolates. Ten fungal isolates were identified with ${\beta}$-tubulin gene. According to the sequences of ${\beta}$-tubulin gene, ten fungal isolates were identified as A. oryzae/flavus complex. For further identification of the ten of fungal isolates, omtA gene, one gene of the aflatoxin biosynthesis gene cluster, was sequenced and the sequences were compared with those of A. oryzae and A. flavus strains from the GenBank database. In addition, identification of the ten fungal isolates was further confirmed using the PCR amplicon of norB and cypA intergenic region, in which a deletion was recognized relative to A. flavus and A. parasiticus. The amplicon size of the ten fungal isolate strains was smaller than those of A. flavus and A. parasiticus, but the same as that of the reference A. oryzae strain. These results indicated that the ten isolates should be identified as A. oryzae. The protease activity in rice koji made with 6, 13, 17, 27, 37 and 38 of strain, respectively was twice higher than that in control. The kojis made with nine of the A. oryzae isolates, respectively, did not produce aflatoxin, suggesting that the strains could possibly be used as starters for soybean products.

The Experimental Study on Antithrombotic activities of Saegeumsan(瑞金散) (서금산(瑞金散)의 항혈전작용(抗血栓作用)에 대(對)한 실험적(實驗的) 연구(硏究))

  • Lee, Bo-ra;Kim, Eui-il;Lee, Jung-eun;Yoo, Dong-Youl
    • The Journal of Korean Obstetrics and Gynecology
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    • v.18 no.1
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    • pp.1-14
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    • 2005
  • This study was performed to evaluate antithrombotic activities of Saegeumsan (瑞金散, SGS) which has effects of activating blood, removing thrombus. This study is designed to measure the effect which was given to blood flow rate through the regular volume of glass tube after the blood was diluted five times with ACD solution. Antithrombotic effect was calculated as a percentage of the experimental animal figure protected from the paralysis of hind legs or death of the mouse that is caused from the administration of platelet aggregation regent. We standardized the time when the experimental animals were incapable of functioning the hind legs more than 20 minutes or maintained trembling. Being classified one group of eight mice, each of them was divided into Normal, Control, and SGS. The normal group supplied a saline solution and the control group brought the dextran extravasated blood after an hour of administering the saline solution. Also, SGS was dissolved in $2m{\ell}$ saline solution and then we dosed it to the experimental mice with Oral Zonde one day before the experiment. After that, the mice were abstained from food. And then we gave a measured amount of it before an hour. Finally, it gave rise to dextran extravasated blood in the same way as the Control group. The results were obtained as follows, SGS significantly inhibited platelet aggregation induced by ADP and epinephrine when analyzed by the Sigmoid $E_{max}$ model in WinNonlin. $EC_{50}$ values of SGS were 4.61 mg/ml and 12.41 mg/ml for ADP and epinephrine respectively. SGS showed fibrinolytic activity insignificantly as compared with the control group. SGS increased blood flow rate significantly as compared with the control group in vitro. SGS inhibited pulmonary embolism induced by collagen and epinephrine(inhibitive rate is 37.5 %). SGS increased number of platelet and fibrinogen amount significantly, and shortened PT and APTT as compared with the control group in thrombus model induced by dextran. According to, SGS is effective antithrombotic activity from experimental result.

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Groundwater Flow Analysis around Hydraulic Excavation Damaged Zone (수리적 굴착손상영역에서의 지하수유동 특성에 관한 연구)

  • Park, Jong-Sung;Ryu, Dong-Woo;Ryu, Chang-Ha;Lee, Chung-In
    • Tunnel and Underground Space
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    • v.17 no.2 s.67
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    • pp.109-118
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    • 2007
  • The excavation damaged zone (EDZ) is an area around an excavation where in situ rock mass properties, stress condition. displacement. groundwater flow conditions have been altered due to the excavation. Various studies have been carried out on EDZ, but most studies have been focused on the mechanical bahavior of EDZ by in situ experiment. Even though the EDZ could potentially form a high permeable pathway of groundwater flow, only a few studies were performed on the analysis of groundwater flow in EDZ. In this study, the' hydraulic EDZ' was defined as the rock Lone adjacent to the excavation where the hydraulic aperture has been changed due to the excavation. And hydraulic EDZ (hydraulic aperture changed zone) estimated by two-dimensional DEM program was considered in three-dimensional DFN model. From this approach the groundwater flow characteristics corresponding to hydraulic aperture change were examined. Together. a parametric study was performed to examine the boundary conditions that frequently used in DFN analysis such as constant head or constant flux condition. According to the numerical analysis, hydraulic aperture change induced by the hydraulic-mechanical interaction becomes one of the most important factors Influencing the hydraulic behavior of jointed rock masses. And also from this study, we suggest the proper boundary condition in three-dimensional DFN model.