• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2007.06a
• /
• pp.531-531
• /
• 2007

현재 널리 사용되고 있는 X선 영상 검출기의 문제점을 해결하기 위해 새로운 연구가 활발히 진행되고 있다. 본 논문에서는 새로운 X선 검출기로써의 가능성 제시를 위해 Display용 PDP(Plasma Display panel)를 디지털 X-ray Detector로 적용하기 위한 기본적인 X-ray에 대한 반응성을 검증하였다. PDP의 X-ray Detector로의 사용 가능성을 보기 위하여, 실험에 사용된 panel은 상용화된(commercial) Display용 PDP의 기본적인 구조와 똑같은 구조의 sample을 제작하여 사용하였다. 제작된 panel은 상판에 Substrate glass와 유전체층, 투명전극을 형성하고, 버스 전극층과 MgO층을 형성하였다. 하판에는 격벽을 제작하고 형광체(R.G.B)층을 형성하고, 어드레스 전극을 형성하여 기존의 Display용 PDP와 똑같은 구조를 지니게 하였다. 이렇게 제작된 panel의 X-선 검출기로서의 전기적 특성물 조사하기 위해 누설전류(Dark current), X선 민감도(X-ray sensitivity), 그리고 선형특성(Linearity)을 측정하였다. 측정 결과, 누설전류가 낮고 X-선 검출기로서의 가능성이 충분한 민감도를 보이며, 선형적 특성 또한 우수한 결과를 보이는 등 안정된 전기적 동작특성을 보였다. 이러한 결과로부터 기존에 사용되어오던 디스플레이용 PDP의 구조적 변경을 통하여 상용화된 PDP룰 디지털 X-선 검출기로서의 적용 가능성을 확인할 수 있었다.

• Nuclear Engineering and Technology
• /
• v.26 no.3
• /
• pp.411-419
• /
• 1994

The containment failure probability due to hydrogen burning during severe accidents proceeding in a low pressure sequence is calculated using Monte Carlo method. The probability distribution functions for this Monte Carlo calculation is obtained from the statistical method. The calculations are performed for Kori unit 2, and the sensitivity studies on the input variables-the amount of hydrogen generated at SFD, cerium diameter, cerium length, oxidation rate at FCI, and the amount of hydrogen generated during MCCI-are also performed. It is revealed that SFD is the main factor in hydrogen generation, but the other sources also cannot be neglected. The containment failure probability due to the hydrogen burning lies within 6% in case of Kori unit 2.

• Journal of Korean Society of Environmental Engineers
• /
• v.28 no.9
• /
• pp.926-934
• /
• 2006

In this study, nitrate uptake rate(NUR) and oxygen uptake rate(OUR) tests were conducted for the assessment of application of Terephtalic acid(TPA) by-product as an alternative external carbon source for sewage treatment plant(STP). With the ASM1 installed in GPS-X the substrate removal characteristic was investigated with simulation by obtained data from NUR and OUR test. As a result, the fraction of RBDCOD(readily biodegradable COD) was mort than 90% and specific denitrification rate was observed about 8.00 mg $NO_3^-$-N/g VSS/hr that was similar to conventional external carbon source. In the next step, sensitivity analysis for heterotrophic biomass in ASM1 was conducted. Optimized parameters of ${\mu}_{max,H}$, $K_s$, ${\eta}_g$, and $b_H$ were 6.60/day, 23.3 mg/L, 0.88, and 0.54/day, respectively. Then, relative mean squared error(RMSE) was reduced to about 40%. Optimized parameters value were well corresponded with the substrate removal characteristics of high maximum and final endogenous specific OUR and high specific NUR.

• Korean Journal of Microbiology
• /
• v.41 no.3
• /
• pp.168-176
• /
• 2005

Vibrio vulnificus, one of the marine bacterial pathogens causing septicemia, was detected using molecular methods, namely, PCR and/or Southern hybridization, and real-time PCR. Extracted and purified total DNAs by using commercial kits were used as templates for PCR. Multiplex-PCR was conducted by employing three sets of primers for the genes, hemolysin (vvhA), phosphomannomutase (pmm), and metalloprotease (vvpE), for V vulnificus virulence. The presence of DMSO ($5\%$) and BSA ($0.1\%$) in PCR reaction mixture improved a detection efficiency by higher PCR band intensities. TaqMan real-time PCR was carried out by using gene segment of vvhA as a target. Detection limit of PCR/Southern hybridization without enrichments was to be around $10^2\;cells\;g^{-1}$ of sample. However, those three methods using the enrichment at $35^{\circ}C$ in APW showed high sensitivity ($2\~10\;cells\;g^{-1}$ of sediments). Highly sensitive detection of V vulnificus by real-time PCR was achieved within $5\~6$ hr, whereas the detection by PCR/Southern hybridization required about 36 hr. Thus, it was evident that real-time PCR is the most rapid and efficient method for detecting V vulnificus in tidal flat sediments.

• The KIPS Transactions:PartB
• /
• v.10B no.5
• /
• pp.491-496
• /
• 2003

We present a new watermark design tool for digital images and digital videos that are based on human visual system (HVS) characteristics. In this tool, basic mechanisms (inhibitory and excitatory behaviour of cells) of HVS are used to determine image dependent upper bound values on watermark insertion. This allows us to insert maximai allowable transparent watermark, which in turn is extremely hard to attack with common image processing, Motion Picture Experts Group (MPEG) compression. As the number of details (e.g. edges) increases in an image, the HVS decrease its sensitivity to the details. In the same manner, as the number of motion increases in a video signal, the HVS decrease its sensitivity to the motions. We model this decreased sensitivity to the details and motions as an (motion) entropy masking. Entropy masking model can be efficiently used to increase the robustness of image and video watermarks. We have shown that our entropy-masking model provides watermark scheme with increased transparency and henceforth increased robustness.

• The Journal of the Korean Society for Microbiology
• /
• v.21 no.3
• /
• pp.387-391
• /
• 1986

Serum samples from 51 patients with clinically suspected typhoid fever were tested for immunoglobulin G (IgG), IgM and IgA antibodies against the whole bacteria antigen of Salmonella typhi by an enzyme-linked immunosorbent assay. The levels of IgG and IgA antibody to-whole bacteria antigen were higher in the culture-proven patients than in controls. The levels of IgM antibody to- whole bacteria antigen showed better discrimination between culture negative patients and controls than those of IgG or IgA antibody to-whole bacteria antigen. The enzyme-linked immunosorbent assay was much more sensitive than the Widal test. It would be a useful tool for the diagnosis of typhoid fever with a single serum sample.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.4 no.3
• /
• pp.159-163
• /
• 2002

This study was analyzed to photosynthetic pigment concentrations and changes of SOD activities on seven species of liana of A. heterophylla, P. scandens, V. thunbergii, P. tricuspidata, C. trilobus, L. japonica and T. kirilowii, and two species of E. arvense and A. princeps of non climbing plants. Concentrations of chlorophyll a and b, total chlorophylls and total carotenoids of P. tricuspidata in 100 ppb ozone site were the most increased. It was the most increased to P. scandens in ratio of chlorophylls and carotenoids, and E. arvense in ratio of chlorophyll a and b. There was difference to ratio of chlorophyll a and b of liana and non liana. At ratio of chlorophyll a and b of 100 ppb ozone site and the control it was more sensitive to chlorophyll a than chlorophyll b, and P. tricuspidata was the most sensitive at comparing with species, and it was more sensitive to liana than non liana. In SOD activities A. princeps was the most increased to 3535.7 unit/g, and P. scandens was the fewest increased to 109.3 unit/g, and A. heterophylla was only decreased to 131.7 unit/g in comparing to 100 ppb ozone sites and the control.

• Korean Journal of Microbiology
• /
• v.46 no.2
• /
• pp.219-222
• /
• 2010

In this study, we evaluated Vi-passive hemagglutination (Vi-PHA), SD Salmonella Typhi IgG/IgM ($SD^{(R)}$ kit) and Widal test for the rapid laboratory diagnosis of typhoid fever patients. A total of 36 serum samples from febrile patients in Korea from 2005 to 2006 were used. Among 36 patients, 27 were fever patients without typhoid, 9 were typhoid fever. Vi-PHA showed 8 positive results out of 9 typhoid fever patients (sensitivity 88.9%) and 1 positive and 26 negative results out of 27 febrile patients without typhoid (specificity 96.3%). The sensitivity and the specificity of $SD^{(R)}$ kit were 100% and 92.6%, respectively. However, the sensitivity and the specificity of Widal O & H tests were 88.9%, 100%, and 77.8%, 70.4%, respectively. Consequently, Widal H and $SD^{(R)}$ kit showed higher sensitivity and Vi-PHA showed higher specificity. To efficient diagnosis, Vi-PHA may be sufficient diagnosis method in acute cases and $SD^{(R)}$ kit and Widal test may be sufficient in sporadic area and high risk group.

• Review of KIISC
• /
• v.29 no.5
• /
• pp.7-20
• /
• 2019

2019년 4월, 4세대 이동통신보다 최대 20배 빠른 속도, 10배 많은 IoT 기기의 연결, 10배 짧은 저지연 서비스를 제공하기 위해 5세대 이동통신이 세계최초로 상용화되었다. 5G 이동통신기술은 고속 대용량의 음성 및 데이터 통신을 제공할 뿐만 아니라 지연 속도와 신뢰성에 민감한 IoT 기기를 수용하기 위해 다양한 최신 기술을 적용하는 기술적 진보가 있었다. 그러나 5G 네트워크 및 서비스가 개방성, 확장성, 유연성을 제공하기 위해 분산 코어 네트워크 구조와 소프트웨어기반 아키텍처(SDN NFV, MEC, 클라우드 컴퓨팅 등)로의 기술적 변화는 새로운 공격 접근 경로와 네트워크 슬라이싱과 같은 논리적인 계층의 복잡한 보안 가시성 이슈 등 사이버보안관점에서 새로운 도전(Challenges)이 되고 있다. 본 논문에서는 5G 모바일 네트워크의 기술적 변화에 따른 보안도전과제와 해외 5G 보안 아키텍처 연구들을 분석하여 5G 보안 설계 및 운영 고려사항을 고찰하고자 한다.

• Journal of Veterinary Clinics
• /
• v.13 no.2
• /
• pp.130-139
• /
• 1996

Malassezia pachydercatis균은 개 외이염의 주된 원인균으로 알려져 있으나, 그 감염률은 지역에 따라 많은 차이가 있다. 그러나 그 기병론적인 역할에 대해서는 아직 명확히 밝혀지지 않았다. 이에 본문에서는 국내에서 사육되는 개의 외이염에서 Malassezia pachydercatis 균의 분리율을 조사하고, Malassezia pachydercatis에 대한 혈중 항체와 외이염과의 연관성을 밝혀 Malassezia pachydercatis에 의한 외이염 진단을 위한 도구로서 간접 ELISA 법의 유용성을 평가해 보고자 본 연구를 수행하였다. 총 112두 중, 외이염에 감염된 개 44두와 정상견 68두를 대상으로, 심부외이도에서 취한 가검물을 배양검사하였고, Malassezia pachydercatis 항원에 대한 혈청내 IgG와 IgM 역가를 간접 ELISA법에 의해 측정하였다. 살아있는 Malassezia pachydercatis 균을 3두의 정상견 외이도에 접종하여 Malassezia pachydercatis 균의 실험적 감염에 대한 조직병리학적 소견, 조직내 침투 정도, 그리고 접종 후 시간경과에 따른 IgG와 IgM의 혈중 역가변화를 측정하였다. Malassezia pachydercatis 균은 외이염이 있는 개 귀에서 가장 높게 분리(50.0%)되었고, 정상귀에서는 낮게 분리(6.3%)되었다. Malassezia pachydercatis 항원을 이용한 간접 ELISA 법 진단에서, Malassezia pachydercatis 양성배양인 외이염 개체에서 IgG와 IgM에 대한 민감도는 각각 41.7%, 20.8%이었고 특이도는 88.2%, 85.2% 이었다. 실험적으로 Malassezia pachydercatis 를 접종한 3두중 1두에서만 조직병리학적 변화와 모낭에 Malassezia pachydercatis 균체가 확인되었으며, IgG와 IgM 혈중역가도 유의성 있게 증가하였다. 국내에서 사육되는 개 외이염의 주된 원인균은 Malassezia pachydercatis 균이었고 이 균의 혈중항체는 유의성 있게 증가하였으며(p<0.005), 간접 ELISA법은 Malassezia pachydercatis 에 의한 개외이염의 유용한 진단도구임을 증명하였다.