• Animal Systematics, Evolution and Diversity
• /
• v.39 no.1
• /
• pp.34-46
• /
• 2023

Three species of the genus Centropages(C. calaninus, C. orsinii, and C. sinensis) were newly collected from Korean waters. The Korean specimens were consistent with previous descriptions, but differ in the following characteristics: in C. orsinii male right antennule with spine on dorsoposterior surface of each segment XIII and XIV; distal end of segment XIX with humplike process on dorsal surface; in C. calaninus female long spinelike process on second exopodal segment of leg 5 of reaching 1/2 length of terminal spine on third exopodal segment; in male, first endopodal segment of leg 5 without inner seta; left second exopodal segment serrated on distal margin; and in C. sinensis male distal spine of left second exopodal segment of leg 5 not fused with segment. In this study, key characters for species identification also were provided.

• Animal Systematics, Evolution and Diversity
• /
• v.22 no.1
• /
• pp.1-11
• /
• 2006

Three new species of Kelleria are described based on the females from the invertebrate burrows in the Port Seogwipo, Jeju Island, Korea. These species possess in common no process on the inner margin of the free segment of leg 5. Kelleria grandisetiger n. sp. possesses a large seta on lateral sides of the genital double-somite and a small thumb-like process near base of the free segment of leg 5. Kelleria undecidentata n. sp. possesses the elongated free segment of leg 5 which is more than four times as long as wide and 11 teeth on the distal margin of the second maxillary segment. Kelleria portiviva n. sp. possesses one seta and one distinct spine on the distal margin of the free segment of leg 5, ten or 11 teeth on the distal margin of the second maxillary segment, and a tuft of spinules on the convex outer comer of mandible.

• Journal of Korean Neurosurgical Society
• /
• v.62 no.5
• /
• pp.603-609
• /
• 2019

Objective : The purpose of this retrospective study was to determine which of the proximal adjacent segment disease (ASD) and distal ASD was more prevalent and what parameters is more related to ASD in proximal levels and distal levels after more than 2 levels fusions. Methods : The medical records were reviewed retrospectively for 856 cases. A total of 66 cases of ASD were enrolled. On preop magnetic resonance imaging, disc degeneration was measured at the upper and lower parts of surgically treated levels and confirmed by the commonly used Pfirrmann grade. Segmental flexibility in sagittal plane was embodied in segment range of motion (ROM) obtained through flexion and extension X-ray before surgery. Coronal angle was recorded as methods Cobb's angle including fusion levels preoperatively. For the comparison of categorical variables between two independent groups, the chi-square test and Fisher exact test were performed. Results : Proximal ASD and distal ASD were 37/856 (4.32%) and 29/856 (3.39%), respectively. The incidence of proximal ASD was relatively high but insignificant differences. In comparison between ASD group and non ASD group, proximal Pfirmman was higher in proximal ASD and distal Pfirmman was higher in distal ASD group (p=0.005, p<0.008, respectively). However, in the ROM, proximal ROM was higher in proximal ASD, but distal ROM was not different between the two groups (p<0.0001, p=0.995, respectively). Coronal angle was not quite different in both groups (p=0.846). Conclusion : In spite of higher frequency in ASD in proximal level in spinal fusion, it is not clear that incidence of ASD in proximal level is not higher than that of distal ASD group in more than 2 level thoracolumbar fusions. Not only Pfirrmann grade but also proximal segmental ROM is risk factor for predicting the occurrence of ASD in patients more than 2 level of thoracolumbar spine fusion operation excluding L5S1.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.31 no.1
• /
• pp.55-59
• /
• 2005

Purpose : This study is to predict the changes of the distal segment by investing the resorption of the excessive distal segment regarding the amount of setback after BSSRO. Material and Methods : 20 patients with Mandible prognathism treated by Obwegeser-Dal Pont method during the years 2000 to 2002 were selected for this study. Group A consisted of 5 males & 5 females with a setback amount of 10mm and above(Mean $10.80mm{\pm}1.03$, n=20) and Group B consisted of 2 males & 8 females with a setback amount of below 10mm.(Mean $6.10mm{\pm}1.10$, n=20) Panorama X-ray was taken at day 1, 1month, 3months, 6months, and 12months after the surgery. Resorption areas of excessive distal segment were measured on these panorama X-rays and compared. Results : There was bone resorption in both groups. Group A showed more bone resorption than Group B. Group B showed slightly higher resorption rate than Group A. However, there was no statistically significant difference between the resorption rates of Group A and Group B. (P>0.05). Conclusion : More bone resorption occurred with a larger amount of setback and about one third of the excessive distal segment underwent resorption, irrespective of the amount of setback.

• Journal of Korean Neurosurgical Society
• /
• v.52 no.5
• /
• pp.501-504
• /
• 2012

Objective : To report our surgical experience using in situ end-to-side bypass for giant serpentine distal anterior cerebral artery aneurysm, unsuitable for microsurgical clipping. Methods : A 49-year-old woman presented with headache and intermittent loss of consciousness. The brain computed tomography scan revealed a partially calcified mass in the interhemispheric fissure. On cerebral angiography, that was giant ($30{\times}18mm$ sized), serpentine aneurysm originating from the A2 to A3 segment of the distal anterior cerebral artery (DACA). The aneurysm was trapped with clips, and the right A3 segment to left A3 segment of DACA, end-to-side in situ bypass was performed. Surgical result was favorable, with no newly developed ischemic event in the acute recovery period. Postoperative angiography showed total occlusion of the aneurysm and good patency, with preserved distal flow. Conclusion : Giant fusiform aneurysms of the DACA are extremely rare and can be particularly challenging to treat. End-to-side A3 : A3 bypass with aneurysm trapping could be a treatment modality for these locations.

• Journal of Korean Neurosurgical Society
• /
• v.29 no.7
• /
• pp.949-952
• /
• 2000

The incidence of superior cerebellar artery aneurysm is less than 1% of all intracranial aneurysms. These aneurysms usually occur at the junction between the superior cerebellar artery and the basilar trunk, however, seldom occur distally. We present a extremely rare case of distal superior cerebellar artery aneurysm arising at the junction between anterior pontine segment and ambient segment.

• Journal of Korean Neurosurgical Society
• /
• v.58 no.5
• /
• pp.467-470
• /
• 2015

A 74-year-old patient was diagnosed with a subarachnoid hemorrhage suspected from a dissecting aneurysm located at the lateral medullary segment of the posterior inferior cerebellar artery (PICA). Because perforators to the medulla arose both proximal and distal to the dissecting segment, revascularization for distal flow was essential. However, several previously reported methods for anastomosis, such as an occipital artery-PICA bypass or resection with PICA end-to-end anastomosis could not be used. Ultimately, we performed an in situ side-to-side anastomosis of the proximal loop of the PICA with distal caudal loops within a single artery, as a "closing omega," followed by trapping of the dissected segment. The aneurysm was obliterated successfully, with intact patency of the revascularized PICA.

• Pediatric Gastroenterology, Hepatology & Nutrition
• /
• v.7 no.2
• /
• pp.260-263
• /
• 2004

Short-bowel syndrome is functionally defined as a state of malabsorption following loss of small bowel, which comprises the sequelae of nutrient, fluid, and weight loss. The proximal segment of the bowel of a patient with intestinal atresia is usually grossly distended and atonic. In contrast, distal segment is smaller. For this reason, anastomosis of the proximal and the distal segment is technically difficult and may cause no propulsion even when they are anastomosed. We experienced that continuous drip ileostomy feeding with the secretions from the proximal stoma stimulated the distal bowel to accommodate and resolved many sequelae following loss of small bowel in a patient with short-bowel syndrome due to IIIa ileal atresia.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.29 no.2
• /
• pp.95-101
• /
• 2003

The purpose of this study was to evaluate the patterns of skeletal changes of proximal and distal segments after one jaw surgery and two jaw surgery with posterior impaction using SSRO on mandible in order to determine the skeletal origin of relapse and compare the stability of surgical methods in anterior open bite. The points and lines from lateral cephalometrics were measured before, after surgery, and at least 6-month follow up period. And then, the positional change of the proximal and distal segment were evaluated respectively. The results obtained were as follows; In cases of two jaw surgery, the results were stabler because they had less relapse factors. In cases of one jaw surgery, the value of APD were increased but it didn't relapse to the original value. Both of proximal and distal segments were responsible for the relapse tendency. But in one jaw surgery, the rotation of proximal segment was more responsible, and in two jaw surgery, the rotation of distal segment was.

• The korean journal of orthodontics
• /
• v.27 no.2
• /
• pp.259-272
• /
• 1997

This study was performed to locate the anteroposterior position of the center of resistance of upper anterior teeth when intrusive forces are acted on them by applying segmented arch mechanics. Three-dimensional finite element model of upper six anterior teeth, periodontal ligament and alveolar bone was constructed The locations of the center of resistance were compared according to the three variables, which are number of teeth contained in anterior segment, axial inclination of anterior teeth, and degree of alveolar bone loss. The following conclusions were drawn from this study; 1. When the axial inclination and alveolar bone height were normal, the locations of center of resistance of anterior segment according to the number of teeth contained were as follows; 1). In 2 teeth segment, the center of resistance was located in the distal area of lateral incisor bracket 2) In 4 teeth segment, the center of resistance was located in the distal 2/3 of the distance between the brackets of lateral incisor and canine. 3) In 6 teeth segment, the center of resistance was located in 3mm distal of canine bracket, which is interproxirnal area. between canine and 1st premolar. 4) As the number of teeth contained in anterior segment increased, the center of resistance shifted to the distal side. 2. As the labial inclination of incisors increased, the center of resistance shifted to the distal side. 3. As the alveolar bone loss increased, the center of resistance shifted to the distal side.