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황종민,신기일,Hwang, Jong-Min,Shin, Key-Il 한국통계학회 2012 Communications for statistical applications and me Vol.19 No.1
절사표본 추출법은 절사층, 표본층, 전수층으로 모집단을 분리한 후 표본층과 전수층의 조사결과를 이용하여 전체 모집단의 총합을 추정하는 방법이다. 이 방법은 왜도가 심한 사업체조사에서 흔히 사용하는 방법이다. 절사층의 총합 추정은 전체 모집단 총합 추정에 영향을 미치므로 절사층 총합의 정확한 추정은 매우 중요하다. 최근 김지학과 신기일 (2011)은 절사층에서 소수의 표본을 추출하여 얻은 결과와 기존의 추정량에서 얻은 결과를 선형결합하는 복합추정법을 제안하였다. 본 논문에서는 최량선형불편예측(best linear unbias predictor; BLUP)을 이용한 새로운 복합추정량을 제안하였으며 모의실험을 통하여 기존의 방법과 새로운 복합 추정량의 우수성을 비교하였다. Cut-off sampling that discards a part of the population from the sampling frame, is a widely used method for a business survey. Usually, to the estimate of population total, an accurate estimate of the total of the take-nothing stratum is required. Many estimators have been developed to estimate the total of the take-nothing stratum. Recently Kim and Shin (2011) suggested a composite estimator and showed the superiority of that estimator. In this paper, we suggest an alternative composite estimator obtained by combining BLUP estimator and a ratio estimator obtained by the small samples from the take-nothing stratum. Small simulation studies are performed for a comparison of the estimators and we confirm that the new suggested estimator is superior.
Radiation exposure in coronary angiography:A comparison of cineangiography and fluorography
황종민,이수용,천민구,이상현,황기원,김정수,박용현,김준홍,전국진 대한심장학회 2015 Korean Circulation Journal Vol.45 No.6
Background and Objectives: Coronary angiography (CAG) is the gold standard for diagnosing coronary artery disease. However,exposure to ionizing radiation delivered during CAG has various negative biological effects on humans. In this study, there was anevaluation of whether fluorography resulted in decreased radiation exposure, as compared with cineangiography. Subjects and Methods: Fifty-five patients were prospectively enrolled and divided into two CAG groups, in accordance with theoperator’s professional discretion: a conventional cineangiography group versus a fluorography group. Fluorography refers to thephotography of fluoroscopic images that are retrospectively stored, e.g., using the “Store fluoro” function of the Siemens cardiacangiography system. The primary outcomes included the air kinetic energy released per unit mass {air kerma (AK) mGy} and the dose(kerma)–area product (DAP; μGy ∙ m2), both measured using built-in software in the Siemens system. The secondary outcomes includedthe total procedure time and amount of contrast agent used with each CAG method. Results: The total AK and DAP were significantly lower in the fluorography group (159.3±64.9 mGy and 1337.9±629.6 μGy ∙ m2,respectively) than in the cineangiography group (326.9±107.5 mGy and 2341.1±849.9 μGy ∙ m2, respectively; p=0.000 for both). The totalprocedure time (cineangiography vs. fluorography, 12.8±4.7 vs. 12.5±2.9 min; p=0.779) and contrast agent amount (136.1±28.3 vs. 126.3±25.7, p=0.214) were comparable between the two groups. Conclusion: Fluorography is a useful method to decrease the radiation exposure in selected patients requiring CAG
내시경 검사에서 점액교를 보인 Menetrier 병 1예
황종민,김광하,김원진,이희선,이혜원,류동엽,송근암,박도윤 대한소화기학회 2011 대한소화기학회지 Vol.57 No.3
Menetrier's disease is a rare entity characterized by large, tortuous gastric mucosal folds. The mucosal folds in Menetrier's disease are often most prominent in the body and fundus. Histologically, massive foveolar hyperplasia (hyperplasia of surface and glandular mucous cells) is noted, which replaces most of the chief and parietal cells. Profuse mucus is usually observed during the endoscopy but there have been few cases that show interesting endoscopic findings such as mucus bridge or water pearl. Herein, we report a case of Menetrier's disease showing mucus bridge by excessive mucus observed during the endoscopy.
황종민,정택,문한섭 한국광학회 2018 한국광학회지 Vol.29 No.6
We report amplification of a small signal in a diode-pumped Cs vapor cell with 500 torr of ethane buffer gas, in the low-pump-power regime of 200 mW or less. For efficient amplifier operation, the pump and signal beams were coupled to a single-mode optical fiber, and completely overlapped in the Cs vapor cell. We investigated the amplification of the small signal according to cell temperature, signal power, and pump power. An amplification factor of 56 was achieved under the conditions of cell temperature of 115°C, signal power of 0.1 mW, and pump power of 200 mW.
황종민,박용현,최경운,김정수,황기원,이상현,천민구,이수용,이대성 한국심초음파학회 2016 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.24 No.4
Cardiac metastasis from renal cell carcinoma (RCC) without inferior vena cava (IVC) involvements is extremely rare with few reportedcases. Sarcomatoid RCC with rhabdoid feature is a rare pathologic type of RCC having aggressive behavior due to greatmetastatic potential. Here, we report a case of rapidly growing cardiac metastasis of RCC which brought on right ventricular outflowtract (RVOT) obstruction without IVC and right atrial involvement in a 61-year-old woman. Cardiac arrest occurred duringradical nephrectomy and echocardiography revealed mass nearly obstructing the RVOT which was not recognized by preoperativeechocardiography 1 month ago. Postoperative immunohistochemical evaluation of renal mass revealed sarcomatoid RCCwith rhabdoid feature.
Extraction of a Fully Deployed Coronary Stent during Retrieval of Another Dislodged Stent
황종민,전국진,이대성,이수용,전민구,이상현,황기원,김준홍 대한심장학회 2016 Korean Circulation Journal Vol.46 No.6
Coronary stent dislodgement is a rare and serious complication of percutaneous coronary intervention and is associated with major adverse cardiac events. Successful retrieval of the stent is recommended in this situation because it is important for the prognosis. Recently, a patient was referred to our hospital with a dislodged coronary stent. When attempting to percutaneously extract the dislodged stent, a challenging situation was encountered, as the stent was entrapped and tightly entangled with another fully deployed coronary stent. Extraction of a fully deployed stent is generally prohibited as it may result in severe complications. Nevertheless, we extracted both the dislodged stent and the fully deployed stent, as a last resort. Herein, we report about this case. Our case highlights if the operator had a thorough understanding of the surrounding circumstances regarding the fully deployed coronary stent, successful extraction of the fully deployed coronary stent without any complications could be possible.