• Title, Summary, Keyword: cell radius

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Cell Counting Algorithm Using Radius Variation, Watershed and Distance Transform

  • Kim, Taehoon;Kim, Donggeun;Lee, Sangjoon
    • Journal of Information Processing Systems
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    • v.16 no.1
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    • pp.113-119
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    • 2020
  • This study proposed the structure of the cluster's cell counting algorithm for cell analysis. The image required for cell count is taken under a microscope. At present, the cell counting algorithm is reported to have a problem of low accuracy of results due to uneven shape and size clusters. To solve these problems, the proposed algorithm has a feature of calculating the number of cells in a cluster by applying a radius change analysis to the existing distance conversion and watershed algorithm. Later, cell counting algorithms are expected to yield reliable results if applied to the required field.

Treatment of Giant Cell Tumor of Distal Radius with Wide Resection and Proximal Fibular Graft (광범위한 절제술 후 근위 비골 이식을 이용한 원위 요골 거대세포종의 치료)

  • Kim, Bu-Hwan;Yi, Sang-Hun;Heo, Mu-Jung;Chun, Sang-Jin;Ryu, Chong-Il;Kim, Yong-Jin
    • Archives of Reconstructive Microsurgery
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    • v.11 no.1
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    • pp.67-72
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    • 2002
  • Purpose : Treatment of giant cell tumor of distal radius can be treated in several ways according to the agressiveness of the tumor. We treated 3 cases of widely involved giant cell tumor of distal radius with wide resection and proximal fibular graft and report the results with review of literatures. Material and Method : We have treated 3 cases of giant cell tumor of the distal radius since last 1990. Among 3 cases, two cases were grade III radiologically and treated by wide resection of distal radius and vascularized proximal fibular graft, and one case, grade II radiologically, treated by distal radial resection and non-vascularized proximal fibular graft. We followed up clinical results of above three cases 9 years, 12 years and 2 years. Result : In all three cases, tranplanted fibula graft showed solid union but grade III tumors recurred at 4 year and 6 year postoperatively. One of the case which recurred 4 year later was treated with secondary wide resection and wrist fusion with autogenous iliac bone graft, and didn't show any recurrent finding for these 5 years after re-operation. And another grade III, which recurred at 6th post-operative year, is under follow-up for 6 years after recur without 2nd operation. Grade II case didn't show any recurrent findings on 2 year follow-up. Conclusion : Grade III cases recurred at 4 year and 6 year follow-up. The cause of recurrence was thought to be invasion of remaining tumor cell in the soft tissue. To prevent recurrence, complete resection of primary tumor was necessary.

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Segmented Ulnar Transposition to Defect of Ipsilateral Radius in the Forearm (전완골 분절의 전위 이식술)

  • Chung, Duke-Whan;Han, Soo-Hong;Lee, Jae-Hoon;Kwon, Boo-Kyung
    • Archives of Reconstructive Microsurgery
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    • v.16 no.2
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    • pp.125-132
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    • 2007
  • Introduction: Ulna is nearly equal to radius in function and bony architecture and strength in forearm. But in lower extremity, fibula is 1/5 of tibia in anatomic and functional point so we can find fibula transposition is commonly used in defect of tibia. We cannot find other article about segmental forearm bone transposition in man. The purpose of this study was to report our clinical and functional result of undergoing segmented transposition of ipsilateral ulna with its own vascular supply in defect of radius in 6 cases. Material and method: From June 1994 to October 2007, 7 segmented bone transpositional grafts in forearm were performed in Kyung Hee Medical Center. The distribution of age was from 20 years old to 73 years old. There was male in 6 cases and female in 1 case. The causes of operation were giant cell tumor in 1 case and traumatic origin in 6 cases; it was nonunion in 2 cases and fracture with severe comminution in 4 cases. Ipsilaterally segmented ulna keeping its own vascular supply was transported to defect of radius in severe traumatic patients and one patient whose tumor in radius had been excised. Transported ulna was fixed to proximal and distal radius remnants by plate and screw. In one case with giant cell tumor, transported ulna was connected to radius across wrist joint as wrist joint fusion. Joint preserving procedures were performed in 6 cases with crushing injury of radius. Results: We could obtain solid bony union in all cases and good functional results. The disadvantage was relative shortening of forearm, but we could overcome this problem. Conclusion: We think that ipsilateral segmented ulna transposition keeping its own vascular supply to radius can be perfomed with one of procedures in cases with wide defect in radius.

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Conceptual Design of the Scroll Air Compressor for Fuel Cell (연료전지용 스크롤 공기압축기 개념설계)

  • Kwon, Tae-Hun;Ahn, Jong-Min;Kim, Hyun-Jin;Shim, Jae-Hwi
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.2
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    • pp.113-120
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    • 2008
  • Potential application of the scroll type machine to air compressor for fuel cell has been studied. Among the seven configuration factors which determine scroll wrap profile, the wrap thickness and the orbiting radius were chosen as two independent variables to generate various scroll wrap profiles. A conceptual design practice was conducted for scroll air compressor for SOFC with power output of 2 kW. With larger wrap thickness and orbiting radius, base plate area of the orbiting scroll becomes smaller, so is the axial gas force acting on the base plate, resulting in reduced thrust loss in spite of larger friction velocity. Performance analysis on the designed model showed that its total efficiency was 64.4% with the mass flow rate per unit compressor input of 0.00905 kg/(s kW) for the wrap thickness of 3.5 mm and the orbiting radius of 3.0 mm.

Microsurgical Reconstruction of Giant Cell Tumor of Distal Epiphysis of Radius (미세 수술을 이용한 광범위한 요골 원위 골단부 거대세포종의 재건술)

  • Kwon, Boo-Kyung;Chung, Duke-Whan;Han, Chung-Soo;Lee, Jae-Hoon
    • Archives of Reconstructive Microsurgery
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    • v.16 no.2
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    • pp.100-107
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    • 2007
  • Treatment of giant cell tumor of distal radius can be treated in several ways according to the aggressiveness of the tumor. But the management of giant cell tumor involving juxta-articular portion has always been a difficult problem. In some giant cell tumors with bony destruction, a wide segmental resection may be needed for preventing to recur. But a main problem is preserving of bony continuity in bony defect as well as preservation of joint function. We have attempted to overcome these problems by using a microvascular technique to transfer the fibula with peroneal vascular pedicle or anterior tibial vessel as living bone graft. From April 1984 to July 2005, we performed the reconstruction of wide bone defect after segmental resection of giant cell tumor in 14 cases, using Vascularized Fibular Graft, which occur at the distal radius. VFG with peroneal vascular pedicle was in 8 cases and anterior tibial vessel was 6 cases. Recipient artery was radial artery in all cases. Method of connection was end to end anastomosis in 11 cases, and end to side in 3 cases. An average follow-up was 6 years 6 months, average bone defect after wide segmental resection of lesion was 6.8 cm. All cases revealed good bony union in average 6.5 months, and we got the wide range of motion of wrist joint without recurrence and serious complications. Grafted bone was all alive. In functional analysis, there was good in 7 cases, fair in 4 cases and bad in 1 case. Pain was decreased in all cases but there was nearly normal joint in only 4 cases. Vascularized fibular graft around wrist joint provided good functional restoration without local recurrence.

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Numerical Analysis of Detonation Wave Propagation Characteristics in Annular Channels (환형 관내의 데토네이션 파 전파 특성 해석)

  • Lee, Su-Han;Cho, Deok-Rae;Choi, Jeong-Yeol
    • Journal of the Korean Society of Propulsion Engineers
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    • v.12 no.2
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    • pp.66-73
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    • 2008
  • Present study examines the detonation wave propagation characteristics in annular channels. Numerical approaches used in the previous studies were extended with marching windows technique. Parametric study has been carried out using a radius of curvature normalized by the channel width considered as unique geometric parameter. In the channels of small radius of curvature, detonation wave is unstable and the regular cell structure is not observed. There is a critical radius of curvature where cell structure can be sustained. The effect of curvature makes the pressure difference on inner and outer surfaces where the detonation wave is overdriven. The results converge to that of straight channel as the radius of curvature gets larger, as expected.

Giant Cell Tumor of the Distal Radius Treated with the Proximal Fibular Graft - A Case Report - (비골이식술로 치료한 요골 원위부의 거대세포종 - 증례 보고 -)

  • Jeong, Hak-Yeong;Yang, Seung-Wook;Shin, Seung-Joon;Song, Moo-Ho;Seung, Hyeong-Joon
    • The Journal of the Korean bone and joint tumor society
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    • v.4 no.2
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    • pp.103-106
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    • 1998
  • Giant cell tumor was described by Sir Astley Cooper in 1818. This tumor is considered to be a benign tumor but has problems of recurrence and metastatic change after treatment. Methods of operative treatment of this tumor have included currettage, currettage and bone graft, excision, resection, excision and graft and amputation. We experienced a case of giant cell tumor which involved the distal part of right radius and treated by wide excision and fibular graft. The postoperative courses have been satisfactory because of no recurrence or malignant change. After 6 years and 1 month follow up, the patient was able to return to daily life without any problem.

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Determination of an Optimum Orbiting Radius for an Oil-Less Scroll Air Compressor

  • Kim, Hyun-Jin;Lee, Yong-Ho;Kwon, Tae-Hun
    • International Journal of Air-Conditioning and Refrigeration
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    • v.16 no.4
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    • pp.124-129
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    • 2008
  • Design practice has been made on an oil-less scroll air compressor as an air supply device for a 2 kW fuel cell system where air pressure of 2 bar and flow rate of 120 liter/min are required. Basic structure of the scroll compressor includes double-sided scroll wrap for the orbiting scroll driven by two crankshafts connected to each other by a timing belt. These features can eliminate thrust surface which otherwise would produce frictional heat and jeopardize reliable operation of the orbiting scroll and the scroll element's deformation as well. This study focuses on optimum scroll wrap design; orbiting radius has been chosen as an independent design parameter. As the orbiting radius changes, scroll sizes such as scroll base plate and discharge port diameters change accordingly. Gas compression-related losses and mechanical loss also change with the orbiting radius. With a scroll base plate diameter of 120mm at most and discharge port of at least 10mm, the orbiting radius should be within the range of 2.5-4.0mm. With this range of the orbiting radius, it was estimated by performance analysis that the compressor efficiency reached to a maximum of ${\eta}_c$=96% at the orbiting radius of $r_s$=3.5mm for the scroll wrap height-to-thickness ratio of h/t=5.

Study of Miniaturization of 2 Stages 2-Arm Sinuous Antenna (2단 2-암 시누어스 안테나의 소형화에 관한 연구)

  • Yoon, Sung-Hyun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.42 no.2
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    • pp.374-382
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    • 2017
  • This paper proposed a 2 stages 2-arm sinuous antenna that operates in frequency range 0.8-6GHz. The proposed antenna's total radius is 60mm, in which 1st stage's radius is 50mm which is designed as self-complementary structure(cell's angle width $90^{\circ}$) with 8 cell, and 2nd stage is composed of non-self-complementary structure with 0.5 cell of cell's angle width $720^{\circ}$ in the radius width 10mm. Measurement's result shows that -10dB return loss starts at 0.807GHz, but 1 stage 2-arm sinuous antenna that use the same radius starts at about 0.878GHz, so proposed the possibility of the miniaturization of the sinuous antenna.

Deformation prediction by a feed forward artificial neural network during mouse embryo micromanipulation

  • Abbasi, Ali A.;Vossoughi, G.R.;Ahmadian, M.T.
    • Animal cells and systems
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    • v.16 no.2
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    • pp.121-126
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    • 2012
  • In this study, a neural network (NN) modeling approach has been used to predict the mechanical and geometrical behaviors of mouse embryo cells. Two NN models have been implemented. In the first NN model dimple depth (w), dimple radius (a) and radius of the semi-circular curved surface of the cell (R) were used as inputs of the model while indentation force (f) was considered as output. In the second NN model, indentation force (f), dimple radius (a) and radius of the semi-circular curved surface of the cell (R) were considered as inputs of the model and dimple depth was predicted as the output of the model. In addition, sensitivity analysis has been carried out to investigate the influence of the significance of input parameters on the mechanical behavior of mouse embryos. Experimental data deduced by Fl$\ddot{u}$ckiger (2004) were collected to obtain training and test data for the NN. The results of these investigations show that the correlation values of the test and training data sets are between 0.9988 and 1.0000, and are in good agreement with the experimental observations.