계산량 감축을 위한 DCT-Based H.263 양자화기의 비교 연구

신경철,Shin, Kyung-Cheol 한국융합신호처리학회 2008 융합신호처리학회 논문지 (JISPS) Vol.9 No.3

동영상 데이터를 효율적으로 압축하기 위해서는 입력 영상 데이터의 공간 및 시간적인 중복성 제거가 요구된다. 움직임 추정 및 보상방법은 시간적인 중성을 효과적으로 제거할 수 있지만 프래임간 예측 때문에 계산량이 증가된다. 따라서 계산량을 줄이면서 실시간 처리가 가능한 알고리즘의 연구가 요구된다. 본 논문에서는 인간 시각 특성을 고려하여 DCT 계수를 효과적으로 양자화할 수 있는 양자화기를 제안한다. 제안된 DCT-based H.263의 양자화기는 같은 전송 속도에서 TMN5보다 더 많은 프레임을 전송 처리함으로 화면 드롭현상을 줄일 수 있었다. 또한 객관적 화질 평가를 위한 평균 PSNR에서 TMN5보다 휘도 신호는 $-0.3{\sim}+0.65dB$의 차이를 보이고 색차 신호에서는 1.73dB 정도의 개선을 나타냈다. 계산량 비교에서는 NTSS에 비하여 $30{\sim}31%$, 4SS에 비하여 $20{\sim}21%$ 계산량의 감소를 나타냈다. To compress the moving picture data effectively, it is needed to reduce spatial and temporal redundancy of input image data. While motion estimation! compensation methods is effectively able to reduce temporal redundancy but it is increased computation complexity because of the prediction between frames. So, the study of algorithm for computation reduction and real time processing is needed. This paper is presenting quantizer effectively able to quantize DCT coefficient considering the human visual sensitivity. As quantizer that proposed DCT-based H.263 could make transmit more frame than TMN5 at a same transfer speed, and it could decrease the frame drop effect. And the luminance signal appeared the difference of $-0.3{\sim}+0.65dB$ in the average PSNR for the estimation of objective image quality and the chrominance signal appeared the improvement in about 1.73dB in comparision with TMN5. The proposed method reduces $30{\sim}31%$ compared with NTSS and $20{\sim}21%$ compared to 4SS in comparition of calculation quantity.

발전기 경제급전량 변동성 추이 분석

신경철(Kyung-Cheol Shin),정현철(Hyun-Cheol Jeong),주성관(Sung-Kwan Joo) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.7

金海大成洞ㆍ東萊福泉洞古墳群 點描

申敬澈(Shin Kyung Cheol) 효원사학회 1995 역사와 세계 Vol.- No.19

발전기 경제급전량 변동성 추이 분석

신경철(Kyung-Cheol Shin),정현철(Hyun-Cheol Jeong),주성관(Sung-Kwan Joo) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.7

대구지역 한 대학병원에서 비결핵 항산균의 미생물학적 분포 및 임상적 특성

홍경수 ( Kyung Soo Hong ),안준홍 ( June Hong Ahn ),최은영 ( Eun Young Choi ),진현정 ( Hyun Jung Jin ),신경철 ( Kyeong Cheol Shin ),정진홍 ( Jin Hong Chung ),이관호 ( Kwan Ho Lee ) 영남대학교 의과대학 2015 Yeungnam University Journal of Medicine Vol.32 No.2

Background: Recent studies have shown that the nontuberculosis mycobacterium (NTM) recovery rate in clinical cultures has increased within Korea. However, another study conducted by a secondary hospital within Daegu reported different results. Therefore, the purpose of this study is to understand and evaluate the microbiological distribution and clinical features of NTM in Daegu. Methods: A retrospective study was conducted on 11,672 respiratory specimens undergoing acid fast bacilli (AFB) culture from 6,685 subjects who visited Yeungnam University Respiratory Center from January 2012 to December 2013. Results: Of the 11,672 specimens undergoing AFB culture, 1,310 specimens (11.2%) showed positive results. Of these specimens, NTM was recovered from 587 specimens, showing a recovery rate of 44.8%. Identification test for NTM was performed on 191 subjects, the results were as follows: M. avium-intracellulare complex (MAC) 123 (64.4%), M. abscessus 20 (10.5%), M. kansasii 12 (6.3%), and 33 other NTM germ strains. Of the 382 subjects with NTM, 167 were diagnosed with pulmonary NTM disease (43.7%), however virulence differed depending on NTM strain. Multivariate analysis showed that nodular bronchiectasis, the nodules, and finding consistent with cavity under imaging study were statistically significant for triggering pulmonary NTM disease. AFB culture showing MAC and M. abscessus was statistically significant as well. Positive predictive value for NTM polymerase chain reaction (NTM-PCR) was 88.6%. Conclusion: Results for NTM recovery rate within the Daegu area were similar to those for the Seoul metropolitan area. We can assume that NTM infection is increasing in our community, therefore AFB-positive subjects (1) should undergo NTM-PCR, (2) should have their culture results checked for differentiation of mycobacterium tuberculosis complex (MTB) from NTM, and (3) undergo NTM identification test to confirm its type. Administration of treatment with the above results should be helpful in improving the patients’ prognosis.

한국 고대 나직물의 유형과 특성

권영숙(Young Suk Kwon),신경철(Kyung Cheol Shin),장현주(Hyun Joo Jang) 한국복식학회 2001 服飾 Vol.51 No.1

Gauze is very light and thin. Their warps are entangled and their structure is loose. It is natural that they are easier to decay than other silk fabrics through physiochemical processes over a long period of time. Nonetheless quite many remains of Gauze fabrics can be found in China or Japan as well as in Korea. Various Gauze was used in costumes since the era of the Three Kingdoms and their weaving techniques, such as using gold threads with silk-fabrics, was developed in Koryo dynasty era, which made it possible to create more magnificent gauze fabrics in Korea. Relatively a lot of Gauze fabrics are remained in Korea. Based on these corroborative relics, this thesis analyzes the characteristics of gauze fabrics possesed in Korea and categorizes the gauze fabrics described in the Decrees on Costume Restraint of the King Hungduk. This also compares them with the present gauze in other countries. The types of gauze fabrics are generally divided into desined gauze, and non-designed gauze, the one without pattern. There are a lot of desined gauze, such as dyeing gauze, brocade gauze, embroidery with gauze ground, patterned gauze with gauze ground etc. which were found in Korea and also in China and Japan. Non-designed gauze is divided into 2-end complex gauze, 3-end complex gauze, 4-end complex gauze, etc depending on the number of crossing warps. All of the non-designed gauze of Koryo dynasty found in Korea was 4-end complex gauze fabrics. These non-designed gauze fabrics were also found in Japan and China.

된장에서 분리된 Leuconostoc mesenteroides 유래 β-glucosidase의 클로닝 및 특성 규명

오유진 ( Yu Jin Oh ),박철순 ( Cheol-soon Park ),이환 ( Hwan Lee ),신경철 ( Kyung-chul Shin ) 한국키틴키토산학회 2022 한국키틴키토산학회지 Vol.27 No.4

한국 전통 발효식품인 된장으로부터 β-glucosidase를 생산하는 유산균을 분리하고자 esculin을 기질로 사용한 고체배지 상에서 명확한 효소활성을 보이는 균주를 분리하였고, 분리한 균주의 16S rRNA 유전자 염기서열 분석한 결과 본 균주는 Leuconostoc mesenteroides (GenBank OK513090.1)와 가장 높은 상동성을 보여 L. mesenteroides BDNA21으로 명명하였다. L. mesenteroides 유래 β-glucosidase는 클로닝 되어 15%의 수율과 14의 purification fold로 가용성의 단일 효소로 정제되었고, SDS-PAGE와 gel-filtration 크로마토그래피에 의해 동종이량체인 것으로 확인되었다. L. mesenteroides 유래 재조합 β-glucosidase의 최적 pH 및 온도는 각각 pH 6.0과 40℃였으며, 최적온도였던 40℃에서 오직 30분 동안에 50%로 잔존효소활성이 감소하는 열 안정성을 보였다. 그럼에도 불구하고 85%의 상대활성을 보였던 35℃에서는 4시간의 반감기를 나타내어 높은 열 안정성을 보였다. 기질특이성 검토에 있어서는 pNP-β-D-glucopyranoside에서 가장 높은 효소 비활성을 나타내었으며, pNP-β-D-fucopyranoside, pNP-β-D-galactopyranoside, oNP-β-D-glucopyranoside, oNP-β-D-galactopyranoside, pNP-α-L-arabinopyranoside, pNP-β-D-xylopyranoside, oNP-β-D-xylopyranoside와 같은 기질에도 가수분해 활성을 나타낸 반면, pNP-α-D-glucopyranoside, pNP- α-D-galactopyranoside, pNP-α-L-arabinofuranoside에는 활성을 보이지 않았다. L. mesenteroides 유래 β-glucosidase는 β-1,2 결합 보다는 β-1,4 결합에 가수분해 활성이 더 높은 것으로 검토되었다. β-Glucosidase producing microorganism was isolated from Doenjang due to its ability of forming black zone on esculin MRS agar plate containing esculin with ferric ammonium citrate. In the analysis of 16S rRNA gene sequence, this strain showed 99% of identity with Leuconostoc mesenteroides (GenBank OK513090.1). A recombinant β-glucosidase from L. mesenteroides was cloned and expressed in Escherichia coli BL21, and the enzyme was purified as a soluble protein with a 14-fold of purification and a final yield of 15%. The recombinant β-glucosidase was determined to be a homodimer by analyses of SDS-PAGE and gel-filtration chromatography. Optimum pH and temperature of β-glucosidase from L. mesenteroides was pH 6.0 and 40℃, respectively. At the optimum temperature of 40℃, the residual enzyme activity decreased to 50% in only 30 min. Nevertheless, it showed a high thermal stability with a half-life of 4 h at 35℃, where a relative activity of 85% was shown. In the substrate specificity study, specific activity was the highest for pNP-β-D-glucopyranoside, and the enzyme showed hydrolytic activity for substrates such as pNP-β-D-fucopyranoside, pNP-β-D-galactopyranoside, oNP-β-D-glucopyranoside, oNP-β-D-galactopyranoside, pNP-α-L-arabinopyranoside, pNP-β-D-xylopyranoside, and oNP-β-D-xylopyranoside. On the other hand, the enzyme showed no activity for pNP-α-D-glucopyranoside, pNP-α-D-galactopyranoside, pNP-α-L-arabinofuranoside. β-Glucosidase from L. mesenteroides had a higher hydrolytic activity on β-1,4 glycosidic linkage than on β-1,2 linkage.

흉수의 감별 진단으로 Cyfra 21-1의 진단적 가치

이학준 ( Hak Jun Lee ),이관호 ( Kwan Ho Lee ),신경철 ( Kyeong Cheol Shin ),신창진 ( Chang Jin Shin ),박혜정 ( Hye Jung Park ),문영철 ( Yeung Chul Mun ),이경희 ( Kyung Hee Lee ),정진홍 ( Jin Hong Chung ),현명수 ( Myung Soo Hyun 대한결핵 및 호흡기학회 1999 Tuberculosis and Respiratory Diseases Vol.47 No.1

우리나라 일차 진료의사의 만성폐쇄성폐질환(COPD) 진료실태조사

박명재 ( Myung Jae Park ),최천웅 ( Cheon Woong Choi ),김승준 ( Seung Joon Kim ),김영균 ( Young Kyoon Kim ),이승룡 ( Sung Yong Lee ),강경호 ( Kyung Ho Kang ),신경철 ( Kyeong Cheol Shin ),이관호 ( Kwan Ho Lee ),이진화 ( Jin Hwa L 대한결핵 및 호흡기학회 2008 Tuberculosis and Respiratory Diseases Vol.64 No.2

연구배경: COPD는 전세계적으로 유병률, 이환율 및 사망률이 급격히 증가하는 질환으로 환자의 삶의 질을 호전 시키고 사회, 경제적인 질병부담을 줄이기 위해 경증 COPD 환자를 조기에 진단하여 적절히 치료하는데 일차진료의사의 역할이 중요하다. 근거중심을 바탕으로 개발된 GOLD와 같은 COPD 진료지침은 이 목적을 위해 유용하나 우리나라의 진료실태가 반영되지 않은 문제점이 있다. 근거중심을 바탕으로 우리나라 진료실정이 반영된 진료지침을 개발하기 위해 우리나라 일차진료의사들의 진료 실태를 조사하여 보고한다. 방법: 진료실태는 웹을 기반으로 COPD의 진단, 치료, 위험인자, 교육, 진료지침에 대한 25개의 설문을 포함 제작하였고 총 217명의 일차진료의사가 설문조사에 동의하고 참여하였다. 참여자의 의사경력은 평균 17.7년이며 76.5%가 내과를 전공하였고 지역적으로는 63.6%가 서울, 경기지역에서 진료를 하고 있었다. 결과: 비교적 높은 비율(61.8%)로 폐기능검사기를 보유하고 있지만 실제 진료 시 활용도는 낮은(35.8%) 편임을 알 수 있었다. 안정 시, 급성악화 시 COPD의 치료에서 경구제제의 처방빈도가 흡입제제에 비해서 모두 높았다. COPD의 주요 위험인자인 흡연에 대해서는 흡연여부 확인율, 금연권유율 등이 90% 이상으로 높았으나 금연을 위한 처방에서 금연 성공률이 높은 니코친대체제와 부프로피온의 병용 처방률이 4.3%로 낮았다. COPD 진료지침에 대한 인지도는 56.7%였고 그대로 따르는 경우는 7.3%로 국내 진료실태를 반영한 진료지침의 개발이 요구되며 진료지침의 보급과 확산을 위해서는 진료지침책자를 포함한 인쇄자료의 보급이 효과적임을 알 수 있었다. 결론: 우리나라 일차진료의사들의 COPD 진료실태는 진단에서 폐기능검사의 보유율에 비해 사용률이 낮고 치료에서 흡입제에 비해 경구제제의 처방을 선호하는 경향을 보였다. GOLD 진료지침에 대한 인지도는 높으나 그대로 따르는 일차진료의사는 적으므로 이번 진료실태조사 결과를 바탕으로 근거중심이지만 국내실정을 반영한 COPD 진료지침의 개발 및 보급이 필요하리라 생각된다. Background: The incidence of chronic obstructive pulmonary disease (COPD) is increasing and the disease is becoming an important cause of morbidity and mortality worldwide. It is important to implement evidence-based guidelines by primary care physicians (PCPs) to establish qualified management of COPD patients. The aim of this survey is to investigate the pattern of COPD management among PCPs and to apply it to the development of Korean COPD guidelines. Methods: A web-based questionnaire was prepared that consisted of 25 questions on the pattern of COPD management. A total of 217 PCPs participated in the survey from June 2006 to May 2007. Results: Many PCPs (61.8%) possessed a spirometer, but the application rate was relatively low (35.8%) and more than half of the COPD patients (57%) did not receive a diagnosis based on spirometry. Administration of oral medication was preferred than the administration of inhaled medication for both stable COPD and acutely exacerbated COPD. More than 90% of the PCPs endorsed educational measures to quit smoking and vaccinate against influenza. It was noted that 56.7% of the PCPs were aware of the GOLD guidelines, but only 7.3% tended to fully implement the recommendations of the guidelines in daily practice. Conclusion: The results of the survey indicate that despite the high awareness rate of the current COPD guidelines, deficits exist among the PCPs with respect to the diagnosis and treatment of COPD. The results of this survey should be applied for the development of new COPD guidelines in order to decrease the discrepancy between the guidelines and the daily practice of the PCPs. (Tuberc Respir Dis 2008;64:109-124)

ATM망에서 ABT/DT 프로토콜을 이용한 동화상 전송방식에 관한 연구

신경철,이광형 慶南專門大學 1999 論文集 Vol.27 No.1