• Journal of Food Hygiene and Safety
• /
• v.17 no.3
• /
• pp.152-156
• /
• 2002

Totally, 742 fishery products were collected at Garak wholesale market in Seoul from Jan. to Dec. in 2001. Vibrio parahaemolyticus were 12.5%(93/742). The detection ratio of V. parahaemolyticus by month was reached the maximum in summer season (July to September). The highest ratio with 22.9% were abtained from molluscs, followed by shellfishes with 15.3%, and fishes and crustaceans with about 8%. The ratio of serotypable strains were 15.2%(10/66) and identified serotyps of V.parahaemolyticus were K24, K28, K34, K42, K47 and K53

• Journal of radiological science and technology
• /
• v.29 no.1
• /
• pp.13-19
• /
• 2006

The PET scanner can detect the photon pair arriving from the source in phantom. The number of light photons released by the crystal(scintillator-BGO or LSO). In recent scintillation crystals in block structures were incorporated into full ring systems, and their resulted marked improvement in spatial resolution and increase in a sensitivity to annihilations. The uniformity of the crystal sensitivity is very important to makes correct information of abnormal states in organs. These factors influenced by the dection efficiency of the scintillators. We have study about the uniformity of crystals to the annihilation, And study about the standard deviation to average counts. The relative standard deviation in central detector groups more uniformed than circumferenced detector groups. It is caused detected quanta of gamma ray by the geometrical factors of PET detector. PET cameras are available with different geometric arrangement and several parallel rings oriented in the axial direction. The center groups from 7th to 40th groups are comparatively uniform and sensitive. But at the circumferenced detectors decreased the sensitivity and uniformity.

• Journal of Life Science
• /
• v.15 no.6 s.73
• /
• pp.941-947
• /
• 2005

The contamination frequency of major foodborne pathogenic bacteria was investigated from 213 seafood samples including sliced raw fish and shellfish in Busan and CyeongNam province area. Tested microorganisms were Salmonella spp. Staphyloroccus aureus, Vibrio parahaemolyticus, Escherichia coli O157:H7, Bncillus cereus, Listeria monocytogenes and Campylobacter jejuni. The frequency of isolated microorganisms was V. parahaemolyticus (30.5%), B. cereus (9.9%), S. aureus (3.8%) and other pathogenic bacteria (1.4%). from July to October, total isolation rates were greater than 50% and V. parahaemolyticus was dominant among the microorganisms isolated. The bacteria isolation rate (49.2%) in raw seafoods including shellfishes was higher than one (28.9%) in sliced raw fish. V. parahaemelyticus isolates were resistant to ampicillin (96.9%), amikacin (29.2%) and tetracycline (27.7%), and B. cereus isolates were resistant to ampicillin (100%), Penicillin G (100%), rifampicin (71.4%) and tetracycline (14.3%). The growth of V. parahaemolyticus and B. rereus was greatly inhibited below $10^{\circ}C$, but increased at ambient temperature. Washing seafood with tap water showed to reduce total count of remaining V. parahaemolyticus. Thus temperature control under $10^{\circ}C$, sufficient washing and prompt eating appeared to reduce the risk of food poisoning by these bacteria in seafoods.

• Journal of Food Hygiene and Safety
• /
• v.27 no.3
• /
• pp.224-232
• /
• 2012

This study was performed to investigate the pesticide residue of commercial medicinal plants used for food materials in the Seoul area. Multi class pesticide multiresidue methods in Korea Food Code was used to analyze 100 pesticides. Analyzed samples were 261 cases(domestic 201, imported 60), detection rate was 19.2%(domestic 20.9%, imports 13.3%). 17 pesticides were detected in fruit(chinese matrimony vine, jujube, rubus coreanus, japanese cornlian cherry, schizandra, tangerine peel), and root(cnidium, licorice, astragalus). Pesticide over Maximum Residue Limits were detected in jujube, cnidium. Frequently detected pesticides were cypermethrin, chlorpyrifos, cyhalothrin, fenvalerate, bifenthrin. More than 50% of the sample were detected two or more pesticides at the same time. Because of the variety and increase of pesticide detection in medicinal roots and fruits, continued monitoring and safety management is required.

• Journal of the Institute of Convergence Signal Processing
• /
• v.9 no.2
• /
• pp.121-128
• /
• 2008

Accurate voice activity detection have a great impact on performance of speech applications including speech recognition, speech coding, and speech communication. In this paper, we propose methods for voice activity detection that can adapt to various car noise situations during driving. Existing voice activity detection used various method such as time energy, frequency energy, zero crossing rate, and spectral entropy that have a weak point of rapid. decline performance in noisy environments. In this paper, the approach is based on existing spectral entropy for VAD that we propose voice activity detection method using MFB(Met-frequency filter banks) spectral entropy, gradient FFT(Fast Fourier Transform) spectral entropy. and gradient MFB spectral entropy. FFT multiplied by Mel-scale is MFB and Mel-scale is non linear scale when human sound perception reflects characteristic of speech. Proposed MFB spectral entropy method clearly improve the ability to discriminate between speech and non-speech for various in noisy car environments that achieves 93.21% accuracy as a result of experiments. Compared to the spectral entropy method, the proposed voice activity detection gives an average improvement in the correct detection rate of more than 3.2%.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.10a
• /
• pp.649-651
• /
• 2004

본 논문은 메모리 집적도의 증가로 인해 많이 발생하는 이웃 패턴 감응 고장에 대한 효율적인 테스팅 방법을 제안하고 있다. 기존의 테스팅 방법에서는 비트 단위의 순차적인 셀 어레이 접근으로 인해 결함 검출율과 테스팅 시간에 있어서 문제를 가지고 있다. 이러한 문제들을 본 논문에서는 이웃 패턴 감응 고장을 효율적으로 검출 할 수 있는 타일 방식으로 셀 어레이를 구분하여 이웃 셀의 영역을 제한한다 그리고 기본 셀과 이웃 셀에 필요한 패턴을 병렬로 입출력시킬 수 있는 병렬 접근 디코더와 검출기를 설계함으로써 전체 테스팅 시간을 줄이고 결함 검출율을 높일 수 있는 방법을 제안한다.

• Proceedings of the Acoustical Society of Korea Conference
• /
• 1994.06c
• /
• pp.125-128
• /
• 1994

선형예측기법으로 피치동기식 분석을 하기 위해 우선적으로 필요한 정보로서 유성음 신호의 영교차 구간별 평균 진폭변동율 추출에 의한 주기별 피치를 검출할 수 있는 기법을 제안하였다. 유성음의 제1포먼트 성분에 대한 각 영교차 구간에서의 평균진폭값은 성대 폐쇄시점에서 주기별 최대치를 나타내며, 평균진폭변동율은 "+" 영역의 평균진폭값과 선행하는 "-" 영역 값의 차로 표시한다. 이 평균 진폭 변동율은 성대파형의영향이 반영되어 주기성이 더욱 강조되므로 분석구간에 대한 구간별 평균피치와 변화의 정도를 이용하여 주기별피치정보를 추출할 수 있다. 검출결과는 구간별 평균피치와 비교하였으며, 좋은 결과가 나타나는 것을 확인할 수 있다.과가 나타나는 것을 확인할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2014.11a
• /
• pp.971-974
• /
• 2014

H.264/AVC 영상 부호화기의 비트율(Bitrate) 제어에 사람의 눈에 잘 인식되는 부분의 화질을 향상하고 인식률이 낮은 부분의 화질을 낮추어 상대적으로 향상된 화질을 얻기 위한 방법을 연구하였다. 먼저 H.264/AVC 영상 부호화기에서, 장면 변화로 인한 참조 프레임의 비트 낭비를 막기 위해 GOP(Group of Pictures) 단위로 장면 변화를 검출한 후, 검출된 장면 변화에 대해 GOP를 적용 시킨다. 해당 GOP 내에서 시각 인지도에 기초하여 물체의 움직임으로 인한 인식률이 높은 부분을 검출하고, 인식률이 높은 부분에 대해 QP(Quantization Parameter)의 재분배로 비트율을 높임으로써 화질을 향상시키고, 인식률이 낮은 부분에 대해서는 비트율을 적게 분배한다. 그 결과 한정된 대역폭을 갖는 전송 환경에서 영상을 향상된 화질로 이용할 수 있는 방법을 제안한다.

• Bulletin of the Korean Space Science Society
• /
• 1993.10a
• /
• pp.23-23
• /
• 1993

과학로케트에 탑재되는 x-선 검출기에서 검출되는 2 kev 에서 10 kev 사이의 x-선 신호를 분석하여 데이터를 얻고, 전송하기 위한 피로를 설계하고 제작하였다. 신호처리회로의 전체적인 구성은 2 - 10 key의 x-선 에너지 및 event time을 측정하는 회로 및8-선 계수율을 측정하기 위한 카운터회로를 위주로 설계하였으며, x-선 event의 에너지가 측정에너지를 벗어나거나 상승시간이 긴 신호는 anti-coincidence 회로를 통하여 제거되고, 그 계수율이 기록되도록 설계 제작되었다. 또한 신호처리회로에서 얻은 데이터는 telemetry를 통하여 serial 형태로 전송되어야 하므로 8086 microprocessor를 이용하여 데이터를 획득하고 전송하도록 하였다. 따라서 본 실험에서 제작된 신호처리회로의 기능 및 특성에 대해 논하고자 한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.11 no.4
• /
• pp.95-103
• /
• 2012

In this paper, we implemented a surveillance system for the power transmission line protection from heavy-duty fender-bender. Laser scanning technology was applied for system design. It was analyzed detailed functions for designed system. Measured detection rate and error rate that are monitoring parameters for both studied system and conventional system were 100%, 0% and 95.8%, 2.1%, respectively. Measurement showed that studied system is almost perfect and better than conventional system. Because this system provides the information to frontline workers with managers of heavy equipments that have possibility of accident, it can be applied to surveillance system for the transmission line protection.