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서정진,정광우,정용연,강형근,김태선,Seo, Jeong-Jin,Jeong, Gwang-U,Jeong, Yong-Yeon,Gang, Hyeong-Geun,Kim, Tae-Seon 대한영상의학회 2002 대한영상의학회지 Vol.47 No.1
목적:출혈성 뇌졸중 환자에서 뇌출혈의 각 시기별 혈색소 상태에 따른 고식적 T1,T2 강조영상의 신호강도를 근거로 하여 뇌출혈의 확산강조영상(diffusion weighted image ;DWI)에 서 신호강도변화를 알아보고자 하였다. 대상과 방법:출혈성 뇌졸중 환자 중 발병시기가 확실하고 DWI와 고식적 자기공명영상(MRI)을 시행한 34명의 환자를 대상으로 하였다.환자의 시기적 분류는 뇌졸중의 증상발현시간과 MRI시행과의 간격에 따라 급성기 (3일 이내)8예,초기 아급성기 (7일 이내)10예,후기 아급성기 (4주 이내)7예,초기 만성기(3개월 이내)4예,그리고 후기 만성기(3개월 이후)5예로 구분하였다.MRI는 1.5T 초전도 기기를 사용하였고,T1 강조영상(T1WI)과 고속스핀에코 T2 강조영상(T2WI)을 얻은 후 단발포에코평면영상기법을 사용하여 DWI를 얻었다.T1WI, T2WI와 DWI에서 뇌출혈병변 중심부의 육안적 신호강도를 알아보았고,각 영상에서 병변 중심부-정상 신호강도비(SIR)를 구하였다. 결과:병변 중심부의 신호강도는 급성기 8예중 5예(24 시간이내)에서 등 또는 고/고/고 (T1WI/T2WI/DWI)신호강도로 보였고,3예(72 시간이내)에서 저/저/저 신호강도를 보였으며 초기 아급성기 10예 모두에서 고/저/저 신호강도를,후기 아급성기 7예 모두에서 고/고/고 신호강도를,초기 만성기 4예 모두에서 고/고/고 신호강도를,그리고 후기 만성기 5예 모두에서 저/고/저 신호강도를 보였다.병변 중심부-정상 신호강도비는 급성기 중 T1WI에서 등 또는 고신호강도로 보인 5예에서 각각 1.42 $\pm$0.78/2.58 $\pm$0.84/1.35 $\pm$0.08 (T1WI/T2WI/ DWI),나머지 3예에서는 각각 0.94 $\pm$0.18/0.63 $\pm$0.16/0.27 $\pm$0.10,초기 아급성기에서는 각각 1.35 $\pm$0.01/0.97 $\pm$0.21/0.86 $\pm$0.22,후기 아급성기에서는 각각 1.58 $\pm$0.04/1.54 $\pm$0.09/1.44 $\pm$0.14, 초기 만성기에서는 각각 1.26 $\pm$0.11/1.06 $\pm$0.14/0.97 $\pm$0.12,그리고 후기 만성기에서는 각각 0.65 $\pm$2.23/1.51 $\pm$0.12/0.23 $\pm$0.18을 보였다. 결론:두개내 혈종은 DWI에서 T2WI를 반영하는 양상으로 관찰되었고 DWI에서 뇌출혈을 시 기에 따라 잘 이해를 하면 출혈성 뇌졸중환자에서 DWI를 해석하는 데 많은 도움이 되리라 생 각된다. Purpose: To determine changes in the signal intensity of intracerebral hemorrhagic lesions according to the time interval, between the onset of symptoms and MR imaging in the T1-weighted (T1W1), T2-weighted (T2W1) and diffusion-weighted modes. Materials and Methods: Thirty-four patients with hemorrhagic stroke who underwent DWI and conventional MRI were involved in this study. Hemorrhagic phase was determined according to the time interval between the onset of symptoms and MR scanning, and was as follows: acute (3 days or less): eight patients); early subacute (7 days or less): ten patients; late subacute (4 weeks or less): seven patients; early chronic (3 months or less) : four patients); and late chronic (more than 3 months): five patients. Using a 1.5T MR imager and the single-shot echo-planar imaging technique, T1-weighted, fast spin-echo T2-weighted, and diffusion-weighted were obtained. In all cases qualitative signal intensity (SI) at the center of a lesion was recorded, and the ratio between this and normal brain parenchyma was calculated. Results: SI at the center of a lesion was found to be iso or high/high/high (T1WI/T2WI/DWI) in five of eight acute-phase cases (interval of 24 hours or less) and low/low/low in the remaining three (interval of 72 hours or less). Other signal intensities were as follows: early subacute phase: high/low/low (all ten cases); late subacute phase: high/high/high (all seven cases); early chronic phase: high/high/high (all four cases); late chronic phase: low/high/low (all five cases). Mean SIRs were as follows: in the five acute-phase cases in which SI was iso or high: 1.42${\pm}$0.78 / 2.58${\pm}$0.84 / 1.35${\pm}$0.08 (T1WI / T2WI / DWI); in the remaining three acute-phase cases: 0.94 ${\pm}$0.18 / 0.63${\pm}$0.16 / 0.27${\pm}$0.10; in the early subacute phase, 1.35${\pm}$0.01 / 0.97${\pm}$0.21 / 0.86${\pm}$0.22 in early subacute phase, 1.58${\pm}$0.04 / 1.54${\pm}$0.09 / 1.44${\pm}$0.14; in the early chronic phase: 1.26${\pm}$0.11 / 1.06${\pm}$0.14 / 0.97${\pm}$0.12; and in the late chronic phase: 0.65${\pm}$2.23 / 1.51${\pm}$0.12 / 0.23${\pm}$0.18. Conclusion: The DWI findings of intracerebral hemorrhage reflect the findings of T2WI. When interpreting the DWI findings in patients with intracerebral hemorrhage, an understanding of the temporal evolution of this is very helpful . The no-show rate, patient distribution, chief complaint, type and number of additional radiologic examinations, patient compliance rate, biopsy result, rate of cancer detection, and staging of cancers were determined. The merits and demerits of the clinic were also assessed. Results: A total of 671 patients attended, with a no-show rate of 13.2%. Referrals from the Health Promation Centre accounted for 90.4% of patient visits. The most frequent complaint was a suspicious nodule at mammography. One additional radiologic examination was performed in 429 patients, two examinations in 70, and three or more examations in five. The most frequent type of examination was ultrasonography, followed by magnification compression view, mammography, and ultrasound-guided aspiration biopsy. An additional radiologic examination was recommended in 81.2% of patients and compliance rate was 96.7%. Primary breast cancer was diagnosed in 16 patients (2.1%), and was found to be stage 0 and 1 in 64.3% of these. No significant demerits were apparent. Conclusion: Radiologic examinations play a very important role in the detection of early-stage breast cancer, and the establishment of an early detection clinic lead by a radiologist is a very effective and recommendable approach to screening.',PY = '2002-00-00',RF = '5',BN = '
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PF대출 분석기법을 활용한 부동산개발사업 사업성 평가 개선 연구
서정진,Seo, Jeong-Jin 한국국토정보공사 공간정보연구원 2014 지적과 국토정보 Vol.44 No.2
2002년 최초 도입된 한국의 부동산투자회사(이하, 리츠)는 크게 3가지 형태가 있다. 한국거래소에 상장된 각각의 리츠는 그 특성이 다르지만 모두 부동산투자회사 종목으로 분류된다. 현행 "부동산투자회사법"은 그 개별 특성을 반영하지 못하고 일률적으로 적용되고 있다. 일부 리츠는 입법취지와는 달리 상장폐지되어 투자자의 투자손실을 야기하는 등 개별 리츠에 따라서는 법제도 운영이 적절하게 이뤄진다고 보기 어려운 일이 발생하였다. 본 연구는 부동산투자회사의 사업타당성 측면에서 동제도의 활발한 운용지원 방안 마련을 목적으로 한다. 부동산 개발 관련 부동산금융기법으로서 PF 평가분석시스템을 개선하여 리츠사업 타당성을 제고시킴으로써 리츠부문 활성화를 위한 정책방향을 제시한다. 리츠 관련 정책은 리츠회사 종류에 따른 차이를 고려하지 않은 일괄적인 제도 운영으로 부동산 시장을 주도하지 못하고 시장상황에 따라 대응하는 대증처리방식으로 운용되어 왔다고 할 수 있겠다. 리츠를 활용한 부동산금융의 고도화를 통하여 건설자금의 원활한 흐름과 상장된 리츠종목에 대한 일반투자자의 적정한 투자를 위한 정책이 실현되어야 할 것이다. 본 연구 결과는 시중부동자금의 투자흐름을 적절하게 유도하고 간접금융투자의 활성화를 위한 부동산 관련 정책에 반영하기 위한 정책 기초자료로 활용하고자 한다. There are three forms of REITs company in Korea that was first introduced in 2002. Each REITs have been listed on the KRX, its characteristics are different, but it is classified as a REITs company in all events. REITs current methods are applied uniformly manner that does not reflect the characteristics of the individual. REITs some, that is not seen unlike legislative intent, it is delisted, such as generating an investment loss of investors. In this study it is an object of the invention from the point of view of REITs business validity, to draw up operational support aggressive plans of the scheme. By improving the PF assesment system, to improve the relevance of REIT business and presenting policy direction to the activation of REITs. Through the sophistication of real estate finance utilizing REITs, policy for proper investment of general investors REITs funds were listed with the smooth flow must be realized. The results of this study, it can be utilized as basic data for policy to reflect the real estate policy for activation of the indirect financial investments.
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서정진(Joungjin Seo),차한주(Hanju Cha) 대한전기학회 2021 전기학회논문지 Vol.70 No.11
Due to continuous environmental problems around the world and an increase in energy consumption, interest in solar power, wind power, and hydropower is increasing. Among them, photovoltaics is the most used in industries and homes because it is easy to repair and can be used for a long time. In photovoltaic PCS, parasitic capacitance is generated between the photovoltaic module and the ground due to the installation structure of the photovoltaic module. This parasitic capacitance, VCM, which is a common mode voltage generated by switching of PCS, is applied to CP, and leakage current occurs. In this paper, the common mode voltage characteristics at three-phase three-level, and three-phase two-level were compared. Proposed an equivalent circuit that was equalized from unaffected by grid impedance the point of view of the common-mode by dividing it into a transformerless type PCS connected to the grid ground and a transformer type PCS applying a transformer. The validity of the proposed equivalent circuit was verified by constructing a three-phase three-level PCS and comparing the equivalent circuit using the experiment measurements and PSIM. In the transformerless PCS, the leakage current is equivalent to 1.13A in the equivalent circuit and 1.14A in the experiment. In the transformer type PCS, the equivalent circuit is 68mA and the experiment 70mA. In addition, for the validity of the proposed equivalent circuit, FFT analysis of leakage current, which is the switching frequency, was performed.
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모바일 시각 검색 시스템의 성능 향상을 위하여 개선된 Speeded Up Robust Features(SURF) 알고리듬
서정진(Jungjin Seo),윤경로(Kyoungro Yoon) 한국방송·미디어공학회 2012 방송공학회논문지 Vol.17 No.2
In the paper, we propose enhanced feature extraction and matching methods for a mobile environment based on modified SURF. We propose three methods to reduce the computational complexity in a mobile environment. The first is to reduce the dimensions of the SURF descriptor. We compare the performance of existing 64-dimensional SURF with several other dimensional SURFs. The second is to improve the performance using the sign of the trace of the Hessian matrix. In other words, feature points are considered as matched if they have the same sign for the trace of the Hessian matrix, otherwise considered not matched. The last one is to find the best distance-ratio which is used to determine the matching points. We find the best distance-ratio through experiments, and it gives the relatively high accuracy. Finally, existing system which is based on normal SURF method is compared with our proposed system which is based on these three proposed methods. We present that our proposed system shows reduced response time while preserving reasonably good matching accuracy.
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서정진(Jeongjin Seo),백성준(Sungjoon Baek) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.12
부동산투자회사(리츠)는 부동산과 그 관련자산에 대한 투자를 통하여 운영되는 회사이다. 리츠는 채권, 일반주식 등과 비교했을 때 배당 중심의 수익구조로서 다른 투자대안에 비하여 상대적으로 고수익, 저위험으로 인식되었다. 리츠는 자기(관리)리츠, 위탁(관리)리츠, 기업구조조정(CR)리츠로 나뉜다. 관리당국은 리츠 활성화차원에서 최소 자본금제한을 지속적으로 감소시켰다. 리츠 규제 완화로 자산규모는 작아졌지만 양적으로는 증가하였다. 자기리츠에 대한 우호적인 시장 반응은 일부 리츠 종목주가를 액면가 대비 7배까지 오르기도 했다. 기존 리츠와 분리하여 자기리츠를 분석하게 되었다. 리츠의 특성변화를 규명하기 위하여 리츠의 일부 자산항목과 수익항목을 갖고 기본적 분석을 실시하였다. 상장리츠의 주가를 대상으로 한 기술적분석으로 시장베타분석 및 분산분석 등을 실시하였다. 위탁리츠와 자기리츠는 서로 다른 특성을 보여주고 있다. 일부 자기리츠는 시장베타를 상회하였다. 분산분석에서는 리츠업이 금융업과 건설업과 다른 시장움직임을 보여주고 있다. 자기리츠와 위탁리츠는 위험감소, 수익개선의 마켓 포트폴리오를 구성할 수 있는 포트폴리오 구성을 보여주었다. 리츠의 특성상, 건설산업 및 부동산 개발 관련 영역에서 사업성 및 수익성을 갖는 부동산개발금융의 역할을 수행한다면 간접투자금융기구로 원활하게 활용될 수 있을 것이다. The REITs is a company that operates by investing in real estate and its relevant assets. When compared to bonds or common stocks the REITs is a low-risk and high-profit investments. There are 3 types of REITs in Korea. The government department responsible for REITs Policy consistently reduced the minimum capital level for the REITs activation. Asset size at The REITs-deregulation brought smaller REITs, but increased in quantitative terms. Friendly reaction of the KRX, some REITs stock price was also up to par ratio of 7 times. Self-management REITs needed to analyze separately from any other REITs. To investigate the changes in REITs characteristics, the fundamental analysis was carried out with some asset and revenue items of REITs. In technical analysis of KRX REITs price, market beta analysis and ANOVA test was studied. Self-management REITs, consignment REITs show different characteristics. A beta of some Self-management REITs was higher than the market beta. The ANOVA test shows different market movement. Self-management REITs, consignment REITs showed portfolio selection management - risk reduction, improve profitability.
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