• The KSFM Journal of Fluid Machinery
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• v.9 no.3 s.36
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• pp.22-28
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• 2006

The discharge coefficient in segmental wedge haying ninety degrees yeller angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured. Main purpose of this work is placed on specifying the characteristic of discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and suggestion for the fixed location of pressure taps useful. Although the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated. The Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000.

• 유체기계공업학회:학술대회논문집
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• 2005.12a
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• pp.302-307
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• 2005

The discharge coefficient in segmental wedge having ninety degrees vertex angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured main purpose of this work is placed on developing the proper form of an equation for the discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and from thata six-term equation which can express the variability of opening ratios was developed. The same assumption and hypotheses were used and tested for all procedures as conventional differential producers; however, the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated the Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000, the resulting equation for the discharge coefficient is relatively simple; it contains only one variable-opening ratio because the characteristic of discharge coefficient of segmental wedge has little connection with the Reynolds number as shown by previous studies.

• Journal of Korean Neurosurgical Society
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• v.38 no.4
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• pp.255-258
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• 2005

Objective : Lumbar lordotic curve on L4 to S1 level is important in maintaining spinal sagittal alignment. Although there has been no definite report in lordotic value, loss of lumbar lordotic curve may lead to pathologic change especially in degenerative lumbar disease. This study examines the changes of lumbar lordotic curve after posterior lumbar interbody fusion with wedge shape cage. Methods : We studied 45patients who had undergone posterior lumbar interbody fusion with wedge shape cage and screw fixation due to degenerative lumbar disease. Preoperative and postoperative lateral radiographs were taken and one independent observer measured the change of lordotic curve and height of intervertebral space where cages were placed. Segmental lordotic curve angle was measured by Cobb method. Height of intervertebral space was measured by averaging the sum of anterior, posterior, and midpoint interbody distance. Clinical outcome was assessed on Prolo scale at 1month of postoperative period. Results : Nineteen paired wedge shape cages were placed on L4-5 level and 6 paired same cages were inserted on L5-S1 level. Among them, 18patients showed increased segmental lordotic curve angle. Mean increased segmental lordotic curve angle after placing the wedge shape cages was $1.96^{\circ}$. Mean increased disc height was 3.21mm. No cases showed retropulsion of cage. The clinical success rate on Prolo's scale was 92.0%. Conclusion : Posterior lumbar interbody fusion with wedge shape cage provides increased lordotic curve, increased height of intervertebral space, and satisfactory clinical outcome in a short-term period.

• Korean Journal of Radiology
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• v.1 no.2
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• pp.98-103
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• 2000

Objective: The purpose of this study was to describe the CT findings of hepatic hypereosinophilic syndrome in which hepatic lobes or segments were involved. Materials and Methods: Seven patients with hypereosinophilic syndrome with hepatic lobar or segmental involvement were included in our study. In all seven, diagnosis was based on liver biopsy and the results of corticosteroid treatment. CT findings were retrospectively reviewed by three radiologists, who reached a consensus. Biopsy specimens were examined, with special reference to portal and periportal inflammation. Results: CT demonstrated well-defined, homogeneous or heterogeneous low attenuation with a straight margin limited to a hepatic lobe (n = 2), segments (n = 3), or subsegments (n = 2), particularly during the portal phase. Where there was subsegmental involvement, lesions were multiple, ovoid or wedge-shaped, and showed low attenuation. In two patients with lobar or segmental involvement, segmental portal vein narrowing was observed. Histopathologic examination disclosed eosinophilic infiltration in the periportal area, sinusoids and central veins, as well as portal phlebitis. Conclusion: Hypereosinophilic syndrome may involve the presence of hepatic lobar, segmental, or subsegmental low-attenuated lesions, as seen on CT images. Their presence may be related to damage of the liver parenchyma and to portal phlebitis.

• Journal of Chest Surgery
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• v.27 no.3
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• pp.215-220
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• 1994

From Jan. 1981 to Dec. 1993, 24 cases of pulmonary hamartoma were experienced sugically at the Department of Thoracic Surgery, College of Medicine, Seoul National University. They consisted of 11 females and 13 males. The age distribution was 24 years to 71 years with a mean age of 49 years. They included 3 cases of endobronchial hamartoma, and 21 cases of pulmonary parenchymal hamartoma. Fifty eight percent of patients [14/24] were asymptomatic. One patient had a multiple pulmonary parenchymal hamartoma, and 1 patient also had combined lung cancer. The operative procedures were 9[37.5%] wedge resections, 5[20.8%] lobectomies, 3[12.5%] enucleations, 3[12.5%] segmental resections, 2[8.3%] bilobectomies, 1[4.2%] lobectomy and segmentectomy, and 1[4.2%] lobectomy, wedge resection, and enucleation. All of the operative results were excellent and without complication.

• Journal of Chest Surgery
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• v.5 no.2
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• pp.125-134
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• 1972

Pulmonary resectlon has evolved as the treatment of choice in certain pulmonary tuberculosis cases. This study represents an analysis of 640 cases of pulmonary resections between March, 1953 and August, 1966 and 370 cases of 13 years follow-up results at the 36th Army Hospital. 1] The ages ranged from 20 to 45 years and all cases were males. 2] The extent of disease revealed 116 Far advanced, 472 Moderate advanced and 52 Minimal Cases. 3] The extent of resections were 373 lobectomies, 130 segmental resections, 58 pneumonectomies,25 multlple lobectomies, 25 lobectomies with thoracoplasties, 22 lobectomies with segmental resections, and 7 wedge resections. 4] The postoperative complications occurred in 71 cases[11.09 percent]. Of these complications,bronchopleural fistula occurred in 13 cases [2.03 percent]. 5] The early operative mortality within 24 hours was 2.0 percent and late mortality within 6 months was 1.4 percent, a total mortality from all causes of 3.4 percent: 15.5 percent following pneumonectomy, 2.1 percent following lobectomy, 1.5 percent following segmental resectlon. 6] All 370 patients were followed for periods ranging from 6 months to 5 years and 5 years to 13 years. Of these former group of 241 patients, 73.3 percent of the cases had returned to full active llfe and remained well, while 15.4 percent were still under treatment. Of these latter group of 129 patients, 76.0 percent of the cases were well and 4.7 percent were still under treatment. 7] In the follow-up results according to extent of disease, the cure rate was greatest in cases of minimal group and lowest in cases of far advanced group. 8] In the results by extent of resection, the cure rate was greatest in cases of lobectomy group. 9] Through the all follow-up periods, 11 patents [3.0 percent] were died. Of these, 3 were suicide and 8 were unknown causes.

• Journal of Chest Surgery
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• v.25 no.10
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• pp.1030-1034
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• 1992

There are follow-up data according to thirteen patients recieved the surgical resection for metastatic lung cancer arising from different primary tumor. The patients were received the surgical resection at Korean Cancer Center Hospital from July 1987 to Setember 1991 and followed-up to August 1992. There were 9 men and 4 women, ranging in age from 16 to 70 years[mean age, 42.8 years]. The primary tumors were 2 synovial sarcoma, 2 sarcoma, 2 osteosarcoma, 3 laryngeal ca, 1 melanoma, 1 ovarian ca and 1 bladder ca. The operative procedures were 5 wedge resections, 1 segmental resection, 5 lobectomies, 1 bil-obectomy and 1 pneumonectomy. There was no operative and hospital death. There were 3 deaths[each survival period: 2, 9 and 20 months, average 10.3 months]and 5 tumor recurrence during follow-up. At now, the average survival period of aliving patients is 29.1 months.

• Journal of Chest Surgery
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• v.33 no.7
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• pp.597-600
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• 2000

Pulmonary endomertiosis is a rare disorder with the typical symptom of hemoptysis during menstruation (catamenial hemoptysis). We report a case of a 19-year-old woman, gravida 0, with 3-month history of catamenial hemoptysis which was confirmed with chest computed tomography. She was treated by means of thoracoscopic wedge resection for the right lesion and fuperior segmental resection through the left thoracotomy, successively. Preoperative fluoroscopy-guided hooking for thoracosopic target lwsion was helpful in circumstances with one lung anesthesia. Four months of follow-up after an uneventful discharge revealed out no recurrence of catamenial hemoptysis in symptoms and images.

• Journal of Chest Surgery
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• v.24 no.10
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• pp.1039-1043
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• 1991

The bullectomy, or sedge resection of the lung including bullae is the treatment of choice for the recurrent spontaneous pneumothorax, and but results in pleuropulmonary fistulae in postoperative periods in some emphysematous lungs. There are many methods to close the air leakages with T-M, Talc powders. Or the closure of air leakage sites can be closed c resuture, wedge resection or lobectomy through re-explothoracotomy. Tisseel, a in thoracic surgical areas in recents. We have sealed the post-operative air leakage sites after bullectomy or segmental resection for 4 recurrent spontaneous pneumothorax with the spray of Tisseel & throbin through thoracoscope without re-explothoracotomy. The post-operative courses are uneventful to now.

• Korean Journal of Radiology
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• v.21 no.9
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• pp.1104-1113
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• 2020

Objective: To assess the regional ventilation in patients with asthma-chronic obstructive pulmonary disease (COPD) overlap syndrome (ACOS) using xenon-ventilation dual-energy CT (DECT), and to compare it to that in patients with COPD. Materials and Methods: Twenty-one patients with ACOS and 46 patients with COPD underwent xenon-ventilation DECT. The ventilation abnormalities were visually determined to be 1) peripheral wedge/diffuse defect, 2) diffuse heterogeneous defect, 3) lobar/segmental/subsegmental defect, and 4) no defect on xenon-ventilation maps. Emphysema index (EI), airway wall thickness (Pi10), and mean ventilation values in the whole lung, peripheral lung, and central lung areas were quantified and compared between the two groups using the Student's t test. Results: Most patients with ACOS showed the peripheral wedge/diffuse defect (n = 14, 66.7%), whereas patients with COPD commonly showed the diffuse heterogeneous defect and lobar/segmental/subsegmental defect (n = 21, 45.7% and n = 20, 43.5%, respectively). The prevalence of ventilation defect patterns showed significant intergroup differences (p < 0.001). The quantified ventilation values in the peripheral lung areas were significantly lower in patients with ACOS than in patients with COPD (p = 0.045). The quantified Pi10 was significantly higher in patients with ACOS than in patients with COPD (p = 0.041); however, EI was not significantly different between the two groups. Conclusion: The ventilation abnormalities on the visual and quantitative assessments of xenon-ventilation DECT differed between patients with ACOS and patients with COPD. Xenon-ventilation DECT may demonstrate the different physiologic changes of pulmonary ventilation in patients with ACOS and COPD.