• Title, Summary, Keyword: OBE

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What is Outcome-Based Education? (제도적인 관점에서 본 성과중심교육)

  • Kim, Bok Ki;Min, Sang Won;Yoon, Woo Young
    • Korean Medical Education Review
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    • v.15 no.1
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    • pp.1-8
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    • 2013
  • Outcome-Based education (OBE) is reviewed from the institutional perspective. The demand for and international trends in OBE are briefly examined and several term related to OBE, especially educational objective and program outcomes (POs), are introduced. It is stressed that systems for continuous quality improvement and quality assurance should be established to ensure the maintenance of the OBE system. Because the criteria for accreditation contain a criterion regarding the quality assurance related to program outcomes, several critical issues are considered regarding the POs themselves and the reduction of the POs. The core value of OBE is not only to provide appropriate education services to students to prepare them with the minimum skills and abilities for advancing their professional service, but also to guarantee the quality of graduates. In addition, the educational program should be continuously improved by employing the evaluation results acquired during the operation of the OBE systems. It is certain that an OBE system is one important aspect of student-centered education.

Stimulating effect of modified Goa-Gi-Um herbal remedy on melanogenesis in B16F10 melanoma cells (B16F10 멜라노마세포에서 과기음가미방의 멜라닌 생성 촉진 효과)

  • Moon, Na-Rang;Kim, Se Yoon;Lee, Jin Hyuk;Lee, Jung Bok;Park, Sunmin
    • The Korea Journal of Herbology
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    • v.28 no.3
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    • pp.69-74
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    • 2013
  • Objectives : Since hypopigmentation is known to increase the risk of skin cancer, melanogenesis in the skin needs to be regulated. Here, we evaluated the melanogenesis stimulatory effects of a modified Goagium herbal remedy (HR) and HR+ox bile (Bos taurus domesticus) extract (OBE) to address hypopigmentation disorders. Methods : B16F10 melanoma cells were treated with different dosages of HR and HR+OBE for 24 to 48 h after 1 h of 10 nM ${\alpha}$-melanocyte stimulating hormone (${\alpha}$-MSH). After the treatment, cell viability, tyrosinase activity, melanin synthesis and the expression of genes related to melanin synthesis were measured and the regulation of the ${\alpha}$-MSH signalling through cAMP responding element binding protein (CREB) was determined. Results : HR and HR+OBE with the ranges of $15{\sim}100{\mu}g/mL$ did not affect cell viability in melanoma cells. The 1 h treatment of HR+OBE (50 and $100{\mu}g/mL$) potentiated the phosphorylation of CREB by enhancing ${\alpha}$-MSH signaling and its 24 h treatment increased CREB expression. Consistent with CREB potentiation, their treatment for 24 h, the expression of microphthalmia-associated transcription factor (MIFT), tyrosinase, tyrosinase related protein (TRP)-1 and TRP-2 were increased in realtime PCR. Ultimately, the 48 h treatment of HR+OBE (50 and $100{\mu}g/mL$) increased tyrosniase activity and melanin contents in the melanoma cells in comparison to the control. Conclusions : HR+OBE (50 and $100{\mu}g/mL$) increases melanin synthesis in B16F10 melanoma cells via the stimulation of tyrosinase activity and expression of MIFT, tyrosinase, TRP-1 and TRP-2. HR+OBE can be used as the a possible treatment for hypopigmentation of the skin.

Study on Communication Each Other Cars by OBE Terminal (OBE 단말기를 이용한 차량 간 통신시스템)

  • Park, Se-Jun;Yoo, Seung-Sun;Yang, Tae-Kyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.8A
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    • pp.838-845
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    • 2008
  • In this study, we developed a OBE(On Board Equipment) system in which moving cars communicate directly each other to exchange traffic information. this system achieved by using DSRC(Dedicated Short Range Communication). this technology can improve the fidelity of collected information by transferring current state information from a moving car to center in real time. As a consequence of it, moving cars can be offer information service of hight quality even in a shadow zone. and also, in addition to basic ETC function for toll payment, using our newly developed system, delivering traffic information and providing additive service like GPS can be achieved by car-to-car direct communication within shadow areas without additional infra-structure.

Development of RF system for Automatic Container Terminal (한국형 컨테이너 터미널 자동화를 위한 RF 시스템 개발)

  • 윤현성;이창호;변건식
    • Proceedings of the Korea Institute of Convergence Signal Processing
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    • pp.41-44
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    • 2000
  • In this paper, the dedicated short range communication(DSRC) system which used as the automatic gate system(AGS) Donga Univ. RRC developed is applied to yard automation. We proposed the communication algorithm of between roadside equipment(RSE) and on-board equipment(OBE). We analyzed transmitted and received information, classification and feature of between OBE and RSE for automation of the container yard and unloading system.

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Seismic Analysis of Traveling Sea Water Screen (해수여과장치의 내진해석)

  • Kim, Heung-Tae;Lee, Young-Shin;Park, Young-Moon
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.24 no.3
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    • pp.289-294
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    • 2011
  • In this study, the seismic analysis of traveling sea water screen for nuclear power plant was performed using finite element model. For qualification of traveling sea water screen, the response spectrum analysis was performed using the given operating basis earthquake(OBE) and safe shutdown earthquake(SSE) floor response spectrum. Dynamic analysis of water sea traveling screen was performed using finite element method. The analytical maximum displacements of traveling sea water screen were 2.5 mm under OBE condition and 4.6 mm under SSE condition. The maximum stresses of traveling sea water screen were 24 MPa under OBE condition and 44 MPa under SSE condition, that this results were 18 %, 27% of yield strength of material. Thus, it can shown that the structural integrity of traveling sea water screen has a stable structure for seismic load conditions.

An Experimental Study on Seismic Damage Indicator Considering Cumulative Absolute Velocity Concept (누적절대속도 개념을 고려한 지진손상표시기의 실험적 연구)

  • 이종림;권기주;이상훈
    • Journal of the Earthquake Engineering Society of Korea
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    • v.5 no.3
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    • pp.65-71
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    • 2001
  • The nuclear power plant(NPP) should be shut down for inspection and tests prior to a return to power if the earthquake exceeds the operating basis earthquake(OBE). The OBE at the plant is considered to have been exceeded if the computed cumulative absolute velocity(CAV) from the earthquake record is greater than 0.16g-sec. However, the CAV criterion should be determined considering the seismic and structural characteristics of the plant. An experimental study using shaking table is conducted in this study to evaluate intensity of CAV criterion. Appropriate level of CAV is evaluated based on the test results using the developed seismic damage indicator(SDI) model. The model consists of stacked acrylic cylinders and is developed to behave consistently for each directional seismic load. The result of the experimental study in dicates that the CAV criterion of 0.16g-sec is conservative enough to be applied to Korean NPPs since the CAV value of the seismic input motion of the Korean standard NPPs ranges from 0.3 to 0.5 g-sec. The developed SDI is expected to be useful not only in easily determining OBE exceedance but also in evaluating earthquake damage quantitatively to provide guidelines for better post-shutdown inspection and test.

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Seismic Test of the Control Rod Drive Mechanism for JRTR (JRTR 제어봉구동장치의 내진시험)

  • Choi, Myoung-Hwan;Kim, Gyeong-Ho;Sun, Jong-Oh;Cho, Yeong-Garp
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.5
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    • pp.552-558
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    • 2016
  • A control rod drive mechanism(CRDM) is a reactor regulating system, which inserts, withdraws or maintains a control rod within a reactor core to control the reactivity of the core. The CRDM for Jordan Research and Training Reactor with 5MW power has been designed and fabricated based on the HANARO’s experience through KAERI and DAEWOO consortium. This paper describes the seismic test results to demonstrate the operability, the drop performance and the structural integrity of CRDM during or after seismic excitations. The seismic tests are carried out under 5 OBE and 1 SSE loads at three Test Rigs simulating the reactor structure and the pool top. From the tests, the CRDM is smoothly driven without a malfunction of stepping motor under OBE load. The pure drop time under OBE and SSE loads is measured as 1.169s and 1.855s to meet the design requirement. Also, it is found that the CRDM maintains the structural integrity without a change of the function and natural frequency before and after seismic loads.

Seismic and Structure Analysis of a Temporary Rack Construction in a Nuclear Power Plant (원자력 발전소 공사용 임시받침대의 내진 및 구조해석)

  • Kim, Heung-Tae;Lee, Young-Shin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.10
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    • pp.1265-1271
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    • 2011
  • In this study, the safety of a rack structure was evaluated through seismic analysis considering fluid-structure interactions using a finite-element model. The rack structure was immersed under water, so it was influenced by the water. The fluid-structure interaction can be specified in terms of the hydrodynamic effect, which is defined as the added mass per unit length. Modal analysis and seismic analysis using the Floor Response Spectrum (FRS) were carried out under Operating Basis Earthquake (OBE) and Safe Shutdown Earthquake (SSE) conditions. The analytical maximum displacements of the rack structure were 0.29 and 0.36 mm under OBE and SSE conditions, respectively. The maximum stresses were 17.9 MPa under OBE conditions and 19.6 MPa under SSE conditions; these results corresponded to 23 % and 14% of the yield strength of the applied material, respectively.

Seismic Analysis of Traveling Sea Water Screen (해수 여과장치의 내진해석)

  • Kim, Heung-Tae;Lee, Young-Shin;Park, Young-Moon
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.462-465
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    • 2011
  • 본 논문에서는 유한요소모델을 사용하여 원자력 발전용 해수 여과장치에 대한 동적 내진해석을 수행하였다. 장치의 검증을 위해서 운전기준지진(Operating Basis Earthquake, OBE)과 안전정지지진(Safe Shutdown Earthquake, SSE)이 설계하중으로 작용하였을 때 부재에 미치는 영향을 평가하였다. 해석대상은 유한요소법을 사용하여 수학적 모델링을 완성하였고, 층응답스펙트럼(Floor Response Spectrum, FRS)에 따른 지진하중과 사하중등을 적용하여 해석을 수행하였다. 해석된 해수여과장치의 최대변위는 OBE 조건에서 2.5 mm 이고, SSE 조건에서 최대변위는 4.6 mm 이다. 최대응력은 OBE 조건에서 24 MPa, SSE 조건에서 44 MPa이며, 이 값은 재료의 항복강도의 각각 18%, 27% 수준이다. 이에 따라 지진하중조건에 따른 해수여과장치의 구조적 안전성이 제시되었다.

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