• Journal of the Korean Society of Visualization
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• v.9 no.3
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• pp.24-29
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• 2011

The improvement of climatic comfort is crucial not only for passenger comfort but also for driving safety. Therefore, a better understanding on the flow characteristics of ventilation flow inside the passenger compartment is essential. Most of the previous studies investigated the ventilation flow using Computational Fluid Dynamics (CFD) calculations or scale-down water-model experiments. In this study, the ventilation flow inside the passenger compartment of a real commercial automobile was investigated using a Particle Image Velocimetry (PIV) velocity field measurement technique. Under real operating conditions, the velocity fields were measured at several vertical planes for several ventilation modes. The experimental data obtained from this study can be used to understand the detailed flow characteristics in the passenger compartment of a real car and to validate numerical predictions.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.12 no.2
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• pp.1-15
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• 2004

In this study, we analyze technical requirements for a 50m unmanned airship order to assure safety in the test flight operation. The 50m class unmanned airship developed by Airship Group in Korea Aerospace Research Institute(KARI). The 50m class unmanned airship was developed as a scale-down model of 200m class stratosphere unmanned airship. This study reviews specifications and characteristics of 50m class unmanned airship and develops Airworthiness Requirements on the basis of current effective Aviation Act, Airworthiness standards, and relevant international documents. The developed requirements can be applied to the safety assessment of the 200m class stratosphere unmanned airship.

• Journal of Food Hygiene and Safety
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• v.8 no.2
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• pp.13-21
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• 1993

Vibrio septicemia,, resulting in high mortality, has been caused by Vibrio vulnificus. Ingestion of marine products or contact with sea water contaminated with Vibrio vulnificus can cause septicemia. Vibrio vulnificus has been detected world wide and west sea area of Korea, Kum river estuary in particular, showed high detection rate. Higher detection rate of Vibrio vulnificus were reported in the bottom deposit with low depth of water, low salinity, and high COD. Man with the liver disease can easily come down with Vibrio septicemia and the main source is the sliced raw fish dish. The preventive measure for this disease is to wash raw fish material thoroughly with tap water and handle in sanitary conditions. Washing with sea water is strictly prohibited . It may be necessary to forbid the small-scale businessmen from selling the sliced ray fish dish in the vicinity of seashore. Man with the liver disease of diabetes should not swim or consume the raw fish dish in the contaminated area during summer.

• Laser Solutions
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• v.11 no.4
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• pp.1-6
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• 2008

This paper describes microscale laser structuring of electrospun(ES) PCL and PET nanofiber meshes. Electrospinning produces non-woven meshes of synthetic or natural materials fibers with diameters ranging from micron down to the nanometer scales that are advantageous for the supporting the growth of the small scale structures. Ultrashort laser found to be effective on the fabrication of engineeredtissue scaffold with minimum heat affect and ultra precision ablation patterns. The affect of energy range for ablation quality was analyzed and ablation characteristics of PCL and PET were compared.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.155-155
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• 2015

메모리 반도체의 지속적인 scale down을 위해서는 고유전 산화막을 이용한 등가산화막두께(EOT) 스케일링이 이뤄져야 한다. 특히, DRAM의 커패시터의 경우, EOT scaling을 위한 신 물질 및 공정개발이 지연되면서 전극과 유전체 사이의 계면특성 개선, 또는 기존에 사용하던 물질을 지속적으로 사용할 수 있는 방안에 대한 필요성이 대두되고 있다. 본 발표에서는 DRAM 커패시터 소재 개발이 겪고 있는 어려움에 대해 소개하고 기존에 반도체 라인에서 사용하고 있는 물질들을 조합한 다성분계 산화막을 이용하여 EOT 0.5 nm를 구현하기 위한 연구 결과에 대해 보고한다. 또한 앞으로 지속적인 커패시터 유전체 개발을 위해 관심을 갖고 수행해야 하는 연구에 대해 함께 다룬다.

• Journal of the Korean Chemical Society
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• v.8 no.4
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• pp.142-146
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• 1964

The author proposed an equation of fading rate, expressed as ${\Delta}E$=${\Delta}E_{1{\infty}}({{1-e^{-k}}_1}^t)+k_2t$, where ${\Delta}E$=fading of dye (colour difference of N.B.S. unit), ${\Delta}E_{1{\infty}}$=extremity value of fading of molecularly dispersed dye, $k_1$, $k_2$=constants, t=exposure (hours). The validity of above equation, which is connected with the state of dye in fibre, was confirmed by experimental in a range of 2-3 colour fading in grey scale value for assessing change in colour visually, except the case of increasing the fading rate with the time resulted from the break-down of dye particles through the heat effect of light; it was also discussed about possiblity of evaluating of fastness to light of dye in early stage.

• Proceedings of the SAREK Conference
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• 2008.06a
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• pp.277-281
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• 2008

This paper presents the development of a high efficiency transport refrigeration system for sliced-raw fish transportation. The refrigeration system is equipped with heat storage for reverse cycle-hot gas defrost (the stored heat is used during defrost cycle of the system). System performance and container operating conditions are analyzed during experimental investigation on a $3,225{\times}1,740{\times}1,640\;mm$ full-scale refrigerated container under cooling and defrosting conditions. The prototype system indicates better performance in terms of shorter cooling-down time, shorter defrost time and smaller fluctuations of refrigerated container's temperature.

• YAKHAK HOEJI
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• v.55 no.3
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• pp.219-226
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• 2011

This study aimed to understand the perception of pharmacy students (n=92) toward educational clerkship in community pharmaciese. The survey results showed that students perceived the need for clinical pharmacy practice-focused education. Students had a strict criterion for the eligibility of preceptors and a strong preference toward a large scale of hospital-nearby pharmacies for a practice site. Students with a previous training experience tended to hold negative opinions on the necessity of practice guidelines. To settle down community pharmacy practice system, students' needs and expectations should be considered.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2007.04a
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• pp.825-830
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• 2007

For the design and maintenance of highways and road structures, the statistical data are needed for the vehicle, especially heavy truck crossing. So far, static weighing has been used but it needs fixed station, crews, and it takes a lot of time. Also truck mix and headway distances cannot be obtained. Weigh-In-Motion system uses the sensor as a weighing scale and collects the axle weights, axle distances, vehicle types and etc. without stopping or slowing down the vehicle. Objectives of the study is make a determination of WIM Sensor for Implementation of U-Overloaded Vehicle Regulation System.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.445-447
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• 2004

본 논문에서는 H.263과 같은 MC-DCT방법을 사용하는 코덱에서 IDCT와 MC(Motion Compensation, 움직임보상)방법을 부분적으로 수정하여 제한된 비율의 축소영상을 디코딩 과정에서 직접 얻을 수 있는 방법을 제안한다. 제안한 방법에서는 8$\times$8 DCT 블록에 대하여 약간의 연산을 가하여 k$\times$k IDCT를 수행하고, 시간적 중복성을 제거하는 과정에서 근사적 움직임벡터를 이용한 2k$\times$2k MC 를 수행하였다. 기존의 코덱을 사용하고 후처리로 축소를 하는 경우와 비교하였을 때에 추가적인 오버헤드가 매우 경미하고 디코딩 과정이 많이 축소되어 계산효율에 있어서 대략 32%의 개선된 실험결과를 얻었고, 화질저하 현상이 개선됨을 실험적으로 보였다.