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Comparison of the Minimum Bounding Rectangle and Minimum Circumscribed Ellipse of Rain Cells from TRMM
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作者 Hongke CAI Yaqin MAO +2 位作者 Xuanhao ZHU Yunfei FU Renjun ZHOU 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第3期391-406,共16页
Based on the TRMM dataset, this paper compares the applicability of the improved MCE(minimum circumscribed ellipse), MBR(minimum bounding rectangle), and DIA(direct indexing area) methods for rain cell fitting. These ... Based on the TRMM dataset, this paper compares the applicability of the improved MCE(minimum circumscribed ellipse), MBR(minimum bounding rectangle), and DIA(direct indexing area) methods for rain cell fitting. These three methods can reflect the geometric characteristics of clouds and apply geometric parameters to estimate the real dimensions of rain cells. The MCE method shows a major advantage in identifying the circumference of rain cells. The circumference of rain cells identified by MCE in most samples is smaller than that identified by DIA and MBR, and more similar to the observed rain cells. The area of rain cells identified by MBR is relatively robust. For rain cells composed of many pixels(N> 20), the overall performance is better than that of MCE, but the contribution of MBR to the best identification results,which have the shortest circumference and the smallest area, is less than that of MCE. The DIA method is best suited to small rain cells with a circumference of less than 100 km and an area of less than 120 km^(2), but the overall performance is mediocre. The MCE method tends to achieve the highest success at any angle, whereas there are fewer “best identification”results from DIA or MBR and more of the worst ones in the along-track direction and cross-track direction. Through this comprehensive comparison, we conclude that MCE can obtain the best fitting results with the shortest circumference and the smallest area on behalf of the high filling effect for all sizes of rain cells. 展开更多
关键词 TRMM minimum bounding rectangle minimum circumscribed ellipse
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An Inequality Concerning the Center of Simplex's Circumscribed Sphere 被引量:12
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作者 苏化明 《Chinese Quarterly Journal of Mathematics》 CSCD 1992年第2期49-51,共3页
Let A={A_1, A_2,…, A_(n+1)} be a simplex in E^n which its center O of circumscribed sphere is in inside of A. If R and R_i are radiuses of A_i respectively (A_i={A_1, A_2,…, A_(i-1), O, A_(i+1),…,A_(n+1)} ,i=1,2,…... Let A={A_1, A_2,…, A_(n+1)} be a simplex in E^n which its center O of circumscribed sphere is in inside of A. If R and R_i are radiuses of A_i respectively (A_i={A_1, A_2,…, A_(i-1), O, A_(i+1),…,A_(n+1)} ,i=1,2,…,n+1),then we have The equality holds if and only if A is a regular simplex. 展开更多
关键词 center and radius of circumscribed sphere of simplex volume of simplex Cayley-Menger determinant
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Subtotal gastrectomy combined with chemotherapy: An effective therapy for patients with circumscribed Borrmann type Ⅳ gastric cancer 被引量:2
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作者 Hai-Bo Huang Zi-Ming Gao +2 位作者 An-Qi Sun Wei-Tian Liang Kai Li 《World Journal of Gastrointestinal Oncology》 SCIE CAS 2020年第11期1325-1335,共11页
BACKGROUND Although Borrmann type Ⅳ(B-4) gastric cancer has a higher mortality rate and presents distant metastasis easily, especially peritoneal metastasis, when diagnosed, some B-4 patients were found to have no di... BACKGROUND Although Borrmann type Ⅳ(B-4) gastric cancer has a higher mortality rate and presents distant metastasis easily, especially peritoneal metastasis, when diagnosed, some B-4 patients were found to have no distant metastasis by preoperative detection and underwent curative surgery, which was defined as circumscribed B-4 in our study. In this study, we focused on the circumscribed B-4 patients without distant metastasis during surgery to identify factors related to prognosis and postoperative peritoneal cavity metastasis(PPCM), which is important for selecting an appropriate therapeutic strategy.AIM To identify factors related to the prognosis and PPCM of B-4 patients.METHODS A total of 117 B-4 patients who underwent gastrectomy between January 2005 and December 2012 were included in this study. Survival analysis was performed using Kaplan–Meier analysis and Cox multivariate models. Pearson correlation analyses were performed to identify the factors related to PPCM. All statistical analyses were performed using SPSS 20.0.RESULTS Lymph node status, gastrectomy type, and postoperative chemotherapy were independent prognostic factors in 117 circumscribed B-4 patients. Subtotal gastrectomy combined with chemotherapy could significantly improve the longterm survival time. Six patients who were diagnosed with pN0 and received the combination therapy had a 3-year survival rate of 100% and a median survival of 77.7 mo. Even for patients with metastatic lymph nodes(n = 13), the combination therapy also increased the 3-year overall survival rate to 57.1%. In addition, positive lymph node status was the only factor(P = 0.005) correlated with PPCM in certain B-4 patients, and chemotherapy was useful for suppressing PPCM in patients with subtotal gastrectomy but not in those with total gastrectomy.CONCLUSION Lymph node status is an independent prognostic factor for circumscribed B-4 patients. In addition, subtotal gastrectomy and postoperative chemotherapy could effectively improve prognosis and even suppress PPCM. 展开更多
关键词 Gastric cancer circumscribed Borrmann typeⅣ PROGNOSIS Subtotal gastrectomy CHEMOTHERAPY
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On a Fixed Value Theorem for Directed Areas in Conic Circumscribed Polygons and Applications 被引量:2
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作者 YU De-sheng 《Chinese Quarterly Journal of Mathematics》 CSCD 2009年第4期485-490,共6页
Using polar equations for conic sections, we research conic circumscribed n-sided polygons(n ≥ 4) deeply on the basis of papers[1-3]. We obtain a general fixed value theorem for directed areas of some triangles in ... Using polar equations for conic sections, we research conic circumscribed n-sided polygons(n ≥ 4) deeply on the basis of papers[1-3]. We obtain a general fixed value theorem for directed areas of some triangles in conic circumscribed n-sided polygons and derive as many as n(n - 3) concurrent points of three lines and some other collinear, equiareal results in conic circumscribed n-sided polygons(n ≥ 4). So the results of papers[1-3] are unified. 展开更多
关键词 conic circumscribed polygon (directed) area fixed value CONCURRENT COLLINEAR
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A case of circumscribed choroidal hemangioma in Sturge-Weber syndrome in China 被引量:1
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作者 Xiao-Lei Yin Jian Ye +1 位作者 Rong-Di Yuan Shu-Xing Ji 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2011年第2期210-211,共2页
We present a case of circumscribed choroidal hemangioma (CCH) in Sturge-Weber syndrome in a 30-year-old woman with congenital port-wine stains on the left side of face involving the upper eyelid, cheek and the nose, a... We present a case of circumscribed choroidal hemangioma (CCH) in Sturge-Weber syndrome in a 30-year-old woman with congenital port-wine stains on the left side of face involving the upper eyelid, cheek and the nose, and she had undergone facial hemangioma surgery 3 years ago suggestive of Sturge-Weber syndrome. She presented with a 1-month history of rapidly decreased visual acuity (VA) to counting fingers in the left eye which had no prior history of visual problem. And there was no evidence of glaucoma. At 3 months after the treatment of the standard photodynannic therapy (PDT) the VA was 20/200. For some reasons, we have no idea about the changes of tumor thickness and subretinal fluid. We confirmed the curative effect of PDT treatment for CCH because of the significantly improved VA in the bad eye. 展开更多
关键词 Sturge-Weber syndrome circumscribed choroidal hemangioma photodynamic therapy
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Comparison of outcomes between overlapping-spot and single-spot photodynamic therapy for circumscribed choroidal hemangioma 被引量:1
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作者 Zhao-An Su Xia-Jing Tang +1 位作者 Li-Xia Zhang Xiao-Hong Su 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2014年第1期66-70,共5页
AIM: To compare the efficacy and safety of photodynamic therapy(PDT) with overlapping multiple spots and single spot for treating circumscribed choroidal hemangioma. · METHODS: Twenty-two patients(22 eyes) with s... AIM: To compare the efficacy and safety of photodynamic therapy(PDT) with overlapping multiple spots and single spot for treating circumscribed choroidal hemangioma. · METHODS: Twenty-two patients(22 eyes) with symptomatic circumscribed choroidal hemangioma received PDT treatment. Fourteen patients received overlapping spots(two to three spots) PDT,whereas eight patients received single-spot PDT. Laser was used at 50J/cm2for 83s in the overlapping-spot group and 50J/cm2for 166s in the single-spot group. Clinical examination,funduscopy,fluorescein angiography,and ultrasonography were performed at baseline and after treatment. ·RESULTS: The mean follow-up time was 28.5 ±8.0 months in the overlapping-spot group and 27.0 ±5.0 months in the single-spot group. Nine patients(64.2%) had their vision improved over two lines on the Snellen chart,and five patients showed stable visual acuity in the overlapping-spot group. The mean thickness of tumor decreased from 2.7 ±0.8mm to 1.2±0.9mm,and the mean greatest tumor linear dimension decreased from 7.4 ± 1.5mm to 4.5 ±3.5mm after treatment. In the single-spot group,two patients(25%) had their vision improved over two lines on the Snellen chart,and six patients had unchanged stable vision. The mean tumor thickness in this group decreased from 2.5±0.7mm to 1.4±1.0mm,and the mean greatest tumor linear dimension decreased from 7.2±1.3mm to 4.7±3.6mm. No significant differences in visual improvement and tumor regression were found between the two groups. ·CONCLUSION:Overlapping-spotPDTunderappropriate treatment parameters and strategies is as effective andsafe as single-spot PDT for treating symptomatic circumscribed choroidal hemangioma. Improved or stabilized visual acuity was achieved as a result of tumor regression. 展开更多
关键词 photodynamic therapy circumscribed choroidal hemangioma spot pattern
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Treatment review of sight threatening circumscribed choroidal haemangioma 被引量:1
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作者 James FT Li Yim Teresa Sandinha +2 位作者 Jan M Kerr Diana Ritchie Ewan G Kemp 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2010年第2期168-171,共4页
AIMTo describe our clinical experience in treating circumscribed choroidal haemangioma (CCH) in a tertiary referral centre over a fifteen year period prior to photodynamic therapy.
关键词 circumscribed choroidal haemangioma plaque brachytherapy transpupillary thermotherapy
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High-dose ruthenium-106 plaque therapy for circumscribed choroidal hemangioma: a retrospective study of 25 Chinese patients
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作者 Jing Li En-Zhong Jin Jian-Hong Liang 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2020年第3期425-430,共6页
AIM:To evaluate the efficacy and safety of ruthenium-106(106Ru)plaque radiotherapy at a dose(>50 Gy)higher than recommended(29-50 Gy)for treatment of circumscribed choroidal hemangioma(CCH)in Chinese patients.METHO... AIM:To evaluate the efficacy and safety of ruthenium-106(106Ru)plaque radiotherapy at a dose(>50 Gy)higher than recommended(29-50 Gy)for treatment of circumscribed choroidal hemangioma(CCH)in Chinese patients.METHODS:This retrospective study included 25symptomatic CCH patients undergoing 106Ru plaque brachytherapy involving 25 eyes between January 2005and August 2016.Ophthalmic examination was performed at the baseline and at each post-treatment follow-up visit,using best-corrected visual acuity(BCVA),dilated fundus examination,and B-scan ultrasonography.The primary efficacy outcome measures included the changes in BCVA and hemangioma dimensions at the last followup visit from the baseline.RESULTS:The mean follow-up duration was 28.0±26.6(range,12-110)mo.All the hemangiomas were located in the posterior pole except for two involving the fovea.The mean apex dose of 106Ru plaque radiotherapy was84.4±19.7 Gy.The mean BCVA improved from 41.4±29.3(0-97)at the baseline to 53.0±33.8(0-97)ETDRS letters at the last visit(P=0.01).The mean hemangioma height declined from 3.98±0.88(2.40-5.50)mm to 0.84±1.63(0-6.47)mm(P≤0.001),and the greatest linear diameter(GLD)reduced from 9.36±2.23(6.80-15.00)to 7.40±2.45(0-13.00)mm(P≤0.001).Hemangioma size increased in one(4%)eye with a worsened vision,and subretinal fluid completely resolved in all but one patient(4%).Radiationrelated retinopathy was observed in two patients at posttreatment 9 and 11mo,respectively.CONCLUSION:106Ru plaque brachytherapy at a dose(>50 Gy)higher than recommended(29-50 Gy)is an effective treatment regimen for symptomatic CCH associated with significantly improved visual acuity and a favorable safety profile in Chinese patients. 展开更多
关键词 circumscribed choroidal HEMANGIOMA RADIOTHERAPY ruthenium-106 Chinese patients RETROSPECTIVE study
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Minimal circumscribed Hermitian ellipsoid of Hartogs domains and an application to an extremal problem 被引量:1
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作者 AHN Heung-ju PARK Jong-do 《Science China Mathematics》 SCIE 2009年第8期1699-1716,共18页
In this paper we construct circumscribed Hermitian ellipsoids of Hartogs domains of least volume and as an application, we obtain the Carathéodory extremal mappings between the Hartogs domains and the unit ball, ... In this paper we construct circumscribed Hermitian ellipsoids of Hartogs domains of least volume and as an application, we obtain the Carathéodory extremal mappings between the Hartogs domains and the unit ball, and also give an explicit formula for calculating the extremal values. 展开更多
关键词 Hartogs domain minimal circumscribed Hermitian ellipsoid extremal problem 32H02 32F45
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Predictors and outcomes of photodynamic therapy on circumscribed choroidal hemangiomas in Chinese patients
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作者 Wang Mingyang Zhang Xinyuan +1 位作者 Wang Yanhong Wang Guanglu 《Chinese Medical Journal》 SCIE CAS CSCD 2014年第15期2874-2876,共3页
Choroidal hemangiomas (CHs) are relatively rare,benign,vascular,hamartomatous tumors.They are categorized to circumscribed choroidal hemangiomas (CCHs) or diffuse choroidal hemangiomas (DCHs) clinically and hist... Choroidal hemangiomas (CHs) are relatively rare,benign,vascular,hamartomatous tumors.They are categorized to circumscribed choroidal hemangiomas (CCHs) or diffuse choroidal hemangiomas (DCHs) clinically and histologically.Although circumscribed CHs (CCHs) are often asymptomatic,they can affect visual acuity (VA) if they are situated beneath the fovea,where they can cause accumulation of secondary subretinal fluid and/or cystic retinal degeneration.Due to its minimal invasiveness and negligible toxicity to the normal retina,photodynamic therapy (PDT) with verteporfin has been applied widely in the treatment of CCH.1 Treatment strategies for CCHs should take into account tumor size,anatomic location,VA,and presence/absence of complications.The present study was conducted to identify potential predictors of successful PDT treatment other than those previously reported.We also present alternative treatment modalities for larger,more complicated CCHs.Keywords:circumscribed choroidalhemangiomas; photodynamic therapy; tumor height; predictors and outcomes;success rate;fluorescence angiography; indocyanine green angiography 展开更多
关键词 circumscribed choroidalhemangiomas photodynamic therapy tumor height predictors and outcomes success rate fluorescence angiography indocyanine green angiography
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Initial transcatheter thrombolysis for acute superior mesenteric venous thrombosis 被引量:9
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作者 Shuo-Fei Yang Bao-Chen Liu +3 位作者 Wei-Wei Ding Chang-Sheng He Xing-Jiang Wu Jie-Shou Li 《World Journal of Gastroenterology》 SCIE CAS 2014年第18期5483-5492,共10页
AIM: To determine the optimal initial treatment modality for acute superior mesenteric vein thrombosis (ASMVT) in patients with circumscribed peritonitis.
关键词 Acute superior mesenteric venous thrombosis Transcatheter thrombolysis Initial management circumscribed peritonitis
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The Extremal Problem on Cartan-egg Domain of the First Type 被引量:2
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作者 SU Jian-bing LI Hai-tao 《Chinese Quarterly Journal of Mathematics》 CSCD 2011年第3期343-349,共7页
In this paper,we study the extremal problem on Cartan-egg domain of the first type by using some inequalities.The extremal mapping and extremal value between the first type of Cartan-egg domain and the unit ball when ... In this paper,we study the extremal problem on Cartan-egg domain of the first type by using some inequalities.The extremal mapping and extremal value between the first type of Cartan-egg domain and the unit ball when k≤1 and k=2,m=2 are constructed. 展开更多
关键词 extremal problem Cartan-egg domain the minimal circumscribed ellipsoid
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Testing method for veer of table tennis ball
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作者 QlU Zu-rong SUN Qian-hui +2 位作者 LIU Jia-chen XUE Jie SU Zhi-kun 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2017年第1期1-8,共8页
Under the premise of fully respecting Technical Leaflet T3developed by the International Table Tennis Federation(I T T F),this paper proposes an effective method for testing the veer degree of the table tennis ball ba... Under the premise of fully respecting Technical Leaflet T3developed by the International Table Tennis Federation(I T T F),this paper proposes an effective method for testing the veer degree of the table tennis ball based on airflow suspension and machine vision.By sequentially capturing the images of the ball in the stable state of spinning and suspension,a set of fitting circle centres from different circular sections can be obtained by circle fitting through the least square method.The minimum circumscribed circle(MCC)diameter of these centres is served as a basic parameter to evaluate the veer degree of the ball.Experimental results show that this diameter can effectively reflect the veer degree of the ball.The method proposed in this papercan provide a technical basis for the veer online testing of the table tennis ball. 展开更多
关键词 table tennis ball veer minimum circumscribed circle (MCC)
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Palisaded encapsulated neuroma of the upper lip
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作者 Kayo Kuyama Hirotaka Oomine +2 位作者 Yan Sun Masanobu Wakami Hirotsugu Yamamoto 《Open Journal of Stomatology》 2012年第3期228-233,共6页
Palisaded encapsulated neuroma (PEN;solitary circumscribed neuroma) is a benign and hyperplastic lesion consisting of Schwann cells. PEN of the lower lip was reported by Tomich and Moll [1] 35 years ago. However, the ... Palisaded encapsulated neuroma (PEN;solitary circumscribed neuroma) is a benign and hyperplastic lesion consisting of Schwann cells. PEN of the lower lip was reported by Tomich and Moll [1] 35 years ago. However, the accumulation of the information about PEN which occurred in the oral mucosa was not enough. This article describes a case of a PEN on the upper lip of a 41-year-old woman. The lesion with 0.7 cm diameter was performed excisional biopsy. Histologically, the tumor was almost circumscribed by thin fibrous capsule, and consisted of diffusely and dense proliferation of the spindle shape cells arranged in interlacing fascicles. Focal suggestions of nuclear pal-isaded growth were indicated within the tumor. Immunohistochemicallly, the fascicles of tumor cells were positive for S-100 protein, and vimentin and negative for α-actin and GFAP. A few numbers of axons were demonstrated by anti-neurofilament antibody in this lesion. Therefore, the definitive diagnosis was PEN. 展开更多
关键词 PALISADED ENCAPSULATED NEUROMA SOLITARY circumscribed NEUROMA IMMUNOHISTOCHEMISTRY
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Automatic recognition and intelligent analysis of central shrinkage defects of continuous casting billets based on deep learning 被引量:2
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作者 Gong-hao Lian Qi-hao Sun +6 位作者 Xiao-ming Liu Wei-miao Kong Ming Lv Jian-jun Qi Yong Liu Ben-ming Yuan Qiang Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第5期937-948,共12页
The internal quality inspection of the continuous casting billets is very important,and mis-inspection will seriously affect the subsequent production process.The UNet-VGG16 transfer learning model was used for semant... The internal quality inspection of the continuous casting billets is very important,and mis-inspection will seriously affect the subsequent production process.The UNet-VGG16 transfer learning model was used for semantic segmentation of the central shrinkage defects of the continuous casting billets.The automatic recognition accuracy of the central shrinkage defects of the continuous casting billets reaches more than 0.9.We use the minimum circumscribed rectangle to quantify the geometric dimensions such as length,width and area of the central shrinkage defects and use the threshold method to rate the central shrinkage defects of the continuous casting billets.The results show that all the testing images are rated correctly,and this method achieves the automatic recognition and intelligent analysis of the central shrinkage defects of the continuous casting billets. 展开更多
关键词 Central shrinkage Deep learning Image segmentation circumscribed rectangle Automatic recognition
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Extremal problems on the Hua domain of the first type 被引量:6
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作者 SU Jianbing & YIN Weiping Mathematics Department, Xuzhou Normal University, Xuzhou 221116, China Mathematics Department, Capital Normal University, Beijing 100037, China 《Science China Mathematics》 SCIE 2005年第z1期343-354,共12页
In this paper we study some extremal problems between the Hua domain of the first type and the unit ball.
关键词 EXTREMAL problem HUA domain of the first type MINIMAL circumscribed HERMITIAN ellipsoid.
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Some basic inequalities in higher dimensional non-Euclid space 被引量:1
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作者 Ding-hua YANG College of Mathematics and Software Sciences, Sichuan Normal University, Chengdu 610066, China Chengdu Institute of Computer Applications, Chinese Academy of Sciences, Chengdu 610041, China 《Science China Mathematics》 SCIE 2007年第3期423-438,共16页
In this paper, the concept of a finite mass-points system ΣN(H(A))(N > n) being in a sphere in an n-dimensional hyperbolic space H n and a finite mass-points system ΣN(S(A))(N > n) being in a hyperplane in an ... In this paper, the concept of a finite mass-points system ΣN(H(A))(N > n) being in a sphere in an n-dimensional hyperbolic space H n and a finite mass-points system ΣN(S(A))(N > n) being in a hyperplane in an n-dimensional spherical space S n is introduced, then, the rank of the Cayley-Menger matrix-ΛN(H) (or a-ΛN(S)) of the finite mass-points system ΣN(S(A)) (or ΣN(S(A))) in an n-dimensional hyperbolic space H n (or spherical space S n) is no more than n + 2 when ΣN(H(A))(N > n) (or ΣN(S(A))(N > n)) are in a sphere (or hyperplane). On the one hand, the Yang-Zhang’s inequalities, the Neuberg-Pedoe’s inequalities and the inequality of the metric addition in an n-dimensional hyperbolic space H n and in an n-dimensional spherical space S n are established by the method of characteristic roots. These are basic inequalities in hyperbolic geometry and spherical geometry. On the other hand, some relative problems and conjectures are brought. 展开更多
关键词 higher dimensional Euclid space SIMPLEX volume radius of circumscribed sphere metric addition Yang-Zhang’s inequality Neuberg-Pedoe’s inequality 51K05
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