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Optical Transfer Function의 變形에 關하여
張浚成 서울대학교 교양과정부 1970 論文集 Vol.2 No.-
The investigation of the characteristics of spatial frequency was attempted to improve the image, utilizing the properties of image forming in Fourier optics. Double diffraction method was used for coherent case, considering the difference between coherent and incoherent case. In the case of an object of a fine wire mesh, it was found that horizontal components of Fourier spectrum contribute to vertical image structure, and the vertical to horizontal. Inserting a narrow slit as a low-pass filter in the focal plane to transform of OTF, the horizontal and vertical image structure could be obtained respectively.
장준성 농업협동조합중앙회 2001 농협조사월보 Vol.524 No.-
공동계산제는 협동조합구성원들의 생산물 판매시 적용하는 독특한 판매방식이다. 공동계산제는 과일, 채소, 견과류, 쌀, 낙농부문산업에서 일반화되어 있으며, 변화와 곡물부문에서도 종종 볼 수 있다. 이 글은 과일 및 채소 협동조합을 중심으로 공동계산제를 설명하고 있다.
張浚成 서울대학교 교양과정부 1971 論文集 Vol.3 No.-
Improving the characteristics of the image, the spatial filtering was attempted at the focal plane of the objective lens. The filter was used by low-pass filters, consisting of a clear circular hole in an apaque mask, high-pass filters, consisting of a apaque circular disk a clear holder. To obtain the quantitative results, the microdensitometer was used for scanning of trace. The characteristics of the spatial filtered output image was discussed about contrast, edge-sharpening, noise filtering and edge-ringing and shifting effect.
응급센터에서의 기관 삽관 후 저혈압을 예측하는 인자로서의modified shock index의 유용성
장준성,이경미,김인병,김현종,김정언 대한응급의학회 2018 大韓應急醫學會誌 Vol.29 No.4
Objective: Hypotension after emergent endotracheal intubation is a serious complication related to in-hospital mortality. We investigated factors including modified shock index to predict the development of hypotension after emergent intubation. Methods: This retrospective observational study was conducted between January 2011 and December 2016. The study population included intubated patients among all medical patients admitted to the emergency department (ED) except for patients whose systolic blood pressure was below 90 mmHg at any time before intubation. The postintubation hypotension (PIH) groups were compared with the non-PIH group. The secondary outcome was in-hospital mortality. Results: A total of 285 patients were included in this study, of which 92 patients (32.3%) PIH. The age (odds ratio [OR], 1.04; 95% confidence interval [CI], 1.01-1.06; P=0.001), serum albumin level (OR, 0.62; 95% CI, 0.41-0.92; P=0.019), shock index (OR, 3.25; 95% CI, 1.26-8.38; P=0.015), and modified shock index (MSI) (OR, 2.18; 95% CI, 1.06-4.47; P=0.034) were more closely associated with PIH than any other factors. The average survival of the PIH group was significantly shorter than that of the non-PIH group (13.6±3.5 vs. 35.6±12.0, log-rank test P=0.019). Conclusion: Overall, 32.3% of hemodynamically stable medical patients developed PIH in ED. MSI was associated with PIH.