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Detection of Spinach Juice Residues on Stainless Steel Surfaces Using VNIR Hyperspectral Images
서영욱,모창연,임종국,이아영,김밝금,장재경,김기영 한국농업기계학회 2021 바이오시스템공학 Vol.46 No.2
Purpose Spinach is one of the most commonly consumed fresh-cut vegetables. Hygiene and sanitation in automated processing facilities have been an important issue. This research aimed to develop a line-scan hyperspectral imaging technique for detecting spinach droplets on a stainless steel surface. Methods The hyperspectral imaging system uses UV-A (365 nm) light sources to obtain 3D hypercube data with spatial and spectral data in the visible and near-infrared (VNIR) region ranging from 400 to 1000 nm. Freshly made 100% spinach juice and distilled water were used to prepare juice dilutions at 20%, 10%, 5%, 2%, and 1% juice. For each of the six juice concentrations, fifteen droplets were placed on a stainless steel sheet, and VNIR hyperspectral image data was collected for the 6 × 15 array of droplets on the metal sheet. To detect and classify the diluted droplets on the spectral domain, three classification models (support vector machine, partial least square discriminant analysis, and random forest) and six pre-processing methods were implemented. Results Among them, support vector machine (SVM) showed the best classification accuracy with A = 0.95. Besides, the classification model used to reduce the number of wavelengths and calculation time, the genetic algorithm (GA) applied to the SVM showed the most accurate result as A = 0.90 among three methods. Conclusions The developed classifier demonstrated potential for detecting and classifying spinach juice droplets on the surface of stainless steel sheet metal.
제왕절개술후 복벽반흔에 발생한 자궁내막증의 임상적 고찰
서영욱,박윤정,박정엽,홍성률,이태엽,공두식,조창호 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.4
배경: 외과적 수술후 반흔부위에 발생하는 자궁내막증은 비교적 드문 질환으로 주로 제왕절개술이나 자궁절개술이후에 발생하는 것으로 알려져 있다. 최근 이질환이 증가하는 경향을 보이나 그 임상적 중요성에 대해서는 잘 알려져 있지 않다. 이에 저자들은 지금까지 경험한 제왕절개술후 수술반흔부위에 발생한 자궁내막증 환자들의 임상적 결과를 분석하고 월경력 및 수술후 수술부위에 자궁내막증이 발생하기까지의 기간을 비교함으로써 수술후 반흔부위에 발생한 자궁내막증의 진단에 도움이 되고자 하였다. 방법: 1981년부터 1997년까지 포항 선린병원, 마산 삼성병원, 마산 파티마병원, 대구 파티마병원에서 제왕절개술을 시행받은 환자중 술후 복벽반흔에 자궁내막증이 발생된 11명과 국내문헌에 보고된 12명을 대상으로 하였다. 이들의 임상적 자료, 수술소견, 조직학적 소견을 분석하였으며 월경력 및 수술후 수술부위에 자궁내막증이 발생하기까지의 기간을 비교하였다. 결과 : 1] 23명 전례[100%]에서 종물감 촉지 및 국소적 동통이 있었으며 5명[21.7%]에서 월경통이 동반되었다. 2] 23명 전례[100%]에서 종물은 단단하게 만져졌으며 19명[92.3%]에서 불규칙적인 종물의 경계를 보였다. 3] 2명[8.7%]에서 피하조직, 복직근 및 복막까지의 침범소견을 보였으며 2명[8.7%]에서 각각 자궁후벽과 우측난소 침범소견을 보였다. 4] 초경과 월경주기, 수술후 수술부위에 자궁내막증이 발생하기까지의 기간은 술후 반흔부위에 발생한 자궁내막증의 빈도에 큰영향을 주지 못했으나[p$gt;0.05] 월경주기가 규칙적인 경우가 불규칙적인 경우에 비해 의미있게 많았으며 월경기간이 정상적인 경우가 긴경우에 비해 의미있게 많은 소견을 보였다[p$lt;0.05]. 결론: 제왕절개술을 시행받은후 복벽반흔에 자궁내막증으로 진단받은 환자에서 초경, 수술후 수술부위에 자궁내막증이 발생하기까지의 기간은 임상적으로 중요한 의미를 나타내지 않을것으로 생각되며 월경주기의 규칙성 및 월경기간은 임상적으로 중요한 인자가 될것으로 보이며 향후 더많은 연구가 필요할것으로 생각된다. Objective Endometriosis in the abdominal scar following cesarean section is very rare condition among the extrapelvic endometriosis. Recently, patients with endometriosis in the abdominal scar were increased but its clinical significances were not well-known. The purpose of this study is to evaluate clinical significant factor of endometriosis in the abdominal scar following cesarean section. Methods We retrospectively studied 19 patients who were histologically confirmed endometriosis in the abdominal scar following cesarean section. We reviewed physical findings, operative findings, histologic findings and analyzed menstrual history[menarche, menstrual cycle, menstrual duration] and interval between cesarean section and endometriosis. Results 1] All patients[100%] complained mass palpation, local pain at operation site and 5 patients[21.7%] complained menorrhalgia. 2] All patients[100%] had firm mass, 19 patients[92.3%] had irregular mass margin. 3] Two patients[8.7%] had peritoneal invasion, one patient[4.4%] was involved posterior wall of uterus and one patient[4.4%] was involved right ovary. 4] According to menarche, menstrual duration and interval between cesarean section and endometriosis, the incidence of endometriosis was not different[p$gt;0.05]. But patients with regular menstrual cycle were more common than patients with irregular menstrual cycle and patients with mormal menstrual duration[2-6 days] were more common than patients with longer menstrual duration[$gt;7 days][p$lt;0.05]. Conclusion We probably suggested that menarche and interval between cesarean section and endometriosis may be not significant factor but menstrual cycle and menstrual duration may be significant factor in patients with endometriosis in the abdominal scar following cesarean section.
Evaluation of Nonthermal Plasma Treatment by Measurement of Stored Citrus Properties
서영욱,박종률,박회만 한국농업기계학회 2018 바이오시스템공학 Vol.43 No.4
Decay of fruit is one of the greatest issues in fruit storage. Purpose: In this study, citrus sterilization was performed to evaluate a dry sterilization method using an atmospheric-pressure nonthermal plasma treatment based on a dielectric-barrier discharge technique. Methods: Citrus samples were stored under four different environmental conditions as follows: group A had cold storage with plasma treatment with a temperature of 6.2 ± 1.0℃ and relative humidity (RH) of 93.4 ± 8.2%, group B had ambient-temperature storage with 22.9 ± 2.3℃ and 82.1 ± 4.5% RH, group C ambient-temperature storage with plasma treatment with 25.3 ± 2.2℃ and 90.0 ± 2.8% RH, and group D had cold storage with 5.7 ± 1.0℃ and 93.4 ± 6.5% RH. Results: As a result of citrus surface sterilization by plasma treatment, treatment groups A and C together showed an average of 16.1 CFU/mL of mold colonies, while control groups B and D showed an average of 2.2ⅹ102 CFU/mL or approximately 13 times greater than the treatment groups. Regarding the mean concentration of aerobic bacteria colonies, the treatment groups (A and C) and control groups (B and D) showed an average of 7.1 CFU/mL and 1.9ⅹ103 CFU/mL, respectively. This is approximately a 270-fold difference in the concentration of pathogen colonies between treatment and control groups. Conclusions: The results showed the potential of nonthermal plasma treatment for citrus storage in enhancing storage duration and quality preservation.