Cu-Al-Ni계 형상기억리본의 변태특성에 미치는 열처리 및 시효의 영향

이영수,박진열,이기열,장우양 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1

The effect of aging, heat treatment and thermal cycling were investigated in 82.9wt%Cu-l2.8wt%-4.3wt%Ni SMA ribbons fabricated by melt spinnig method A, temperature of SMA ribbons aged a t 100℃ was increased and then decreased with increasing aging time. A, temperature of SMA ribbons aged at 200℃ was decreased with increasing aging time By the X-ray diffraction test, the volume fraction of DO_3 of SMA ribbons aged at 200℃ was increased with increasing aging time In the thermal-cycled ribbons after 200℃ aging, A, temperature was decreased below 1st A, temperature and then A, temperature was not changed with increasing cycle number. With increasing time in order of 3min, 5min and 7min, the grain size of ribbon heat-treated at 600℃ was increased in order of 6㎛, 8㎛ and 11㎛ In the heat-treated ribbons at 550℃, γ_2 phases were observed.

An Aneurysm Developing on the Infundibulum of Posterior Communicating Artery : Case Report and Literature Review

Jang, Woo-Youl,Joo, Sung-Pil,Kim, Tae-Sun,Kim, Jae-Hyoo The Korean Neurosurgical Society 2006 Journal of Korean neurosurgical society Vol.40 No.4

Infundibular dilatation is funnel-shaped symmetrical enlargement that occurs at the origin of cerebral arteries and which is apparent on 7 to 25% of normal angiograms. Infundibular dilatation is frequently considered a normal anatomic variation of no pathologic significance. The authors report a case in which an aneurysm developed on an infundibular dilatation of the posterior communicating artery [PComA]. A 72-year-old woman presented with severe headache, nausea, and vomiting. Digital subtraction angiography showed a saccular aneurysm arising from the origin of the left PComA. Operative findings revealed the aneurysm and infundibular widening of the right PComA. The aneurysm was successfully obliterated. Whether infundibular dilatation is a pre-aneurysmal state or a benign dilatation is controversial. However, we believe infundibular dilatation of the PComA in this case may have served as a pre-aneurysmal lesion.

Serum S-100B Protein as a Prognostic Factor in Patients with Severe Head Injury

Jang, Woo-Youl,Kim, Jae-Hyoo,Joo, Sung-Pil,Lee, Jung-Kil,Kim, Tae-Sun,Kim, Soo-Han The Korean Neurosurgical Society 2006 Journal of Korean neurosurgical society Vol.39 No.4

Objective : Despite the recent progress that has been made in intracerebral monitoring, it is still difficult to quantify the exact extent of primary brain damage after severe head injury. In this work, we investigate the role of S-100B protein as a serum marker of brain damage after severe head injury. Methods : 21 patients with severe head injury [GCS score <9] were selected for this prospective study. A venous blood sample was taken as soon as possible after head injury and the serum concentration of S-100B protein was measured daily for five consecutive days. The serum level of S-100B protein was compared with the patients' outcome. The outcome was measured twice, at hospital discharge and after 6 months of follow-up using the Glasgow Outcome Scale[GOS]. Results : Those patients who died within two weeks [after head injury] had a significantly higher serum S-100B value than those who survived [median, 9.64ug/L versus 2.91ug/L]. Seven [78%] of the nine patients who died had a maximum S-100B value of 2ug/L or higher, while three [25%] of the twelve surviving patients showed a maximum S-100B protein value of more than 2ug/L [P<005]. Conclusion : These results indicate that S-100B protein appears to be the most reliable index for estimating the extent of brain damage.

Intramedullary Subependymoma of the Thoracic Spinal Cord

Jang, Woo-Youl,Lee, Jung-Kil,Kim, Jae-Hyoo,Kim, Soo-Han The Korean Neurosurgical Society 2006 Journal of Korean neurosurgical society Vol.39 No.5

An Intramedullary subependymoma of the spinal cord is a rare tumor with only 43 reported cases in the literature. Most of them are reported to be localized within the cervical spinal cord. We report a rare case of a thoracic spine intramedullary subependymoma in a 37-year-old female who presented with back pain and radiating leg pain. Subtotal resection and post-operative radiotherapy were performed. Subependymomas developing in the spinal cord are benign with a low proliferative potential. Complete resection of the tumor appears to be the optimal method for a complete cure. However aggressive surgery may cause severe neurological deficit. Therefore, if severe neurological deficits are expected after complete removal, a partial removal and postoperative radiation therapy is an alternative method for treatment in selected cases. A large-scale randomized study is mandatory to clarify the effectiveness of radiotherapy and to establish the recurrence rate and prognosis with respect to the surgical removal of these tumors.

Radiologic assessment of the optimal point for tube thoracostomy using the sternum as a landmark: a computed tomography-based analysis

Jaeik Jang,Jae-Hyug Woo,Mina Lee,Woo Sung Choi,Yong Su Lim,Jin Seong Cho,Jae Ho Jang,Jea Yeon Choi,Sung Youl Hyun The Korean Society of Traumatology 2024 大韓外傷學會誌 Vol.37 No.1

Purpose: This study aimed at developing a novel tube thoracostomy technique using the sternum, a fixed anatomical structure, as an indicator to reduce the possibility of incorrect chest tube positioning and complications in patients with chest trauma. Methods: This retrospective study analyzed the data of 184 patients with chest trauma who were aged ≥18 years, visited a single regional trauma center in Korea between April and June 2022, and underwent chest computed tomography (CT) with their arms down. The conventional gold standard, 5th intercostal space (ICS) method, was compared to the lower 1/2, 1/3, and 1/4 of the sternum method by analyzing CT images. Results: When virtual tube thoracostomy routes were drawn at the mid-axillary line at the 5th ICS level, 150 patients (81.5%) on the right side and 179 patients (97.3%) on the left did not pass the diaphragm. However, at the lower 1/2 of the sternum level, 171 patients (92.9%, P<0.001) on the right and 182 patients (98.9%, P= 0.250) on the left did not pass the diaphragm. At the 5th ICS level, 129 patients (70.1%) on the right and 156 patients (84.8%) on the left were located in the safety zone and did not pass the diaphragm. Alternatively, at the lower 1/2, 1/3, and 1/4 of the sternum level, 139 (75.5%, P=0.185), 49 (26.6%, P<0.001), and 10 (5.4%, P<0.001), respectively, on the right, and 146 (79.3%, P=0.041), 69 (37.5%, P<0.001), and 16 (8.7%, P<0.001) on the left were located in the safety zone and did not pass the diaphragm. Compared to the conventional 5th ICS method, the sternum 1/2 method had a safety zone prediction sensitivity of 90.0% to 90.7%, and 97.3% to 100% sensitivity for not passing the diaphragm. Conclusions: Using the sternum length as a tube thoracostomy indicator might be feasible.

청신경초종의 치료전략

장우열(Woo-Youl Jang),정신(Shin Jung) 대한두개저학회 2014 대한두개저학회지 Vol.9 No.2

내측 접형능선수막종의 수술적 치료 : 수술 전 얕은중간대뇌정맥의 혈류개통 상태에 대한 평가 및 수술 결과

장우열(Woo-Youl Jang),정신(Shin Jung),문경섭(Kyung-Sub Moon),정태영(Tae-young Jung),김인영(In-Young Kim) 대한두개저학회 2009 대한두개저학회지 Vol.4 No.2

Objectives Surgical management of medial sphenoid ridge meningioma is challenging due to their intimate relationship with anterior visual pathway, cavernous sinus, and arteries of anterior circulation. We analyzed extent of resection and recurrence rate of medial sphenoid ridge meningiomas and discuss the usefulness of preoperative cerebral angiogram in determining preservation of large drainage vein. Methods Between 1995 and 2010, 38 cases of medial sphenoid ridge meningioma underwent surgical resection. Preoperative cerebral angiogram was performed in 29 patients (76.3%) and evaluated the patency of superficial middle cerebral vein and collateral circulation. Results Total resection was achieved in 27 patients (71.1%). Recurrence was observed in 3 patients (11.1%). Regrowth was observed in 4 (36.4%) of the 11 patients with subtotal resection. Two patients of sphenoid ridge meningioma with interdural cavernous sinus extension were successfully removed. Superficial middle cerebral vein was sacrificed in 1 patient. There was no surgical mortality and symptomatic cerebral infarction. Conclusions Sphenoid ridge meningioma with interdural cavernous sinus extension can be removed safely without cranial nerve deficit compared to the meningioma with intracavernous sinus extension. The patency of superficial middle cerebral vein and development of collateral vessel were helpful to determine intraoperative preservation of large drainage vein.

안와 신경초종

장우열(Woo-Youl Jang),정신(Shin Jung),정태영(Tae-Young Jung),김인영(In-Young Kim),강삼석(Sam-Suk Kang),김수한(Soo-Han Kim) 대한두개저학회 2006 대한두개저학회지 Vol.1 No.1

Intracranial schwannomas predominantly arise from the 8th cranial nerve, and less commonly from the 5th, 9th, 10th, and 7th cranial nerves. Herein, we describe the clinical features and surgical management of orbital schwannomas. A 64-year-old woman and 45-year-old woman were admitted to our hospital with complaints of proptosis. In particular, visual field defects and decreased visual acuity were demonstrated in the 64-year-old patient. A CT scan showed low density lesions within the orbital canal. MR imaging revealed a low signal intensity on the T1-weighted scan, and a high signal intensity on the T2-weighted scan with heterogenous enhancement. The tumors were totally resected via an orbitocranial approach. The histopathological finding was neurilemmoma. It was found in one patient that the tumor originated from the lacrimal nerve. In the other patient, the tumor originated from the frontal branch of the trigeminal nerve. There was minimal sensory change in the periorbital area in the case of the schwannoma which originated from the trigeminal nerve and a visual field defect remained in the case of the patient with the lacrimal schwannoma. Even though schwannomas have been reported to originate from all cranial nerves, except the optic nerve, most arise from the vestibular nerve. We reported two cases of orbital schwannoma which originated from the lacrimal nerve and the frontal branch of the trigeminal nerve, respectively.

Attenuation of Morphine Tolerance and Withdrawal Syndrome by Coadministration of Nalbuphine

Jang, So-Yong,Kim, Hee-Jeong,Kim, Dong-Hyun,Jeong, Myeon-Woo,Ma, Tangen,Kim, Seong-Youl,Ho, Ing K.,Oh, Sei-Kwan The Pharmaceutical Society of Korea 2006 Archives of Pharmacal Research Vol.29 No.8

Morphine has been used widely on the treatment of many types of chronic pain. However the development of tolerance to and dependence on morphine by repeat application is a major problem in pain therapy. The purpose of the present study was to investigate whether combined administration of nalbuphine with morphine affects the development of tolerance to and dependence on morphine. We hypothesize that the use of nalbuphine, ${\kappa}-agonist$ may prove to be useful adjunct therapy to prevent morphine-induced undesirable effects in the management of some forms of chronic pain. Morphine (10 mg/kg) was injected to rats intraperitoneally for 5 day. The variable dose of nalbuphine (0.1, 1.0 and 5.0 mg/kg) was administered (i.p.) in combination with morphine injection. The development of morphine tolerance was assessed by measuring the antinociceptive effect with the Randall-Selitto apparatus. The development of dependence on morphine was determined by the scoring the precipitated withdrawal signs for 30 min after injection of naloxone (10 mg/kg, i.p.). Nalbuphine did not attenuate antinociceptive effect of morphine in rats. Interestingly, combined administration of morphine with nalbuphine (10:1) significantly attenuated the development of dependence on morphine. The elevation of $[^3H]MK-801$ binding in frontal cortex, dentate gyrus, and cerebellum after chronic morphine infusion was suppressed by the coadministration of nalbuphine. In addition, the elevation of NR1 expression by morphine was decreased by the coadministration of nalbuphine in rat cortex. These results suggest that the coadministration of nalbuphine with morphine in chronic pain treatment can be one of therapies to reduce the development of tolerance to and dependence on morphine.

Analysis of Process Parameters to Improve On-Chip Linewidth Variation

Jang, Yun-Kyeong,Lee, Doo-Youl,Lee, Sung-Woo,Lee, Eun-Mi,Choi, Soo-Han,Kang, Yool,Yeo, Gi-Sung,Woo, Sang-Gyun,Cho, Han-Ku,Park, Jong-Rak The Institute of Electronics and Information Engin 2004 Journal of semiconductor technology and science Vol.4 No.2

The influencing factors on the OPC (optical proximity correction) results are quantitatively analyzed using OPCed L/S patterns. ${\sigma}$ values of proximity variations are measured to be 9.3 nm and 15.2 nm for PR-A and PR-B, respectively. The effect of post exposure bake condition is assessed. 16.2 nm and 13.8 nm of variations are observed. Proximity variations of 11.6 nm and 15.2 nm are measured by changing the illumination condition. In order not to seriously deteriorate the OPC, these factors should be fixed after the OPC rules are extracted. Proximity variations of 11.4, 13.9, and 15.2 nm are observed for the mask mean-to-targets of 0, 2 and 4 nm, respectively. The decrease the OPC grid size from 1 nm to 0.5 nm enhances the correction resolution and the OCV is reduced from 14.6 nm to 11.4 nm. The enhancement amount of proximity variations are 9.2 nm corresponding to 39% improvement. The critical dimension (CD) uniformity improvement for adopting the small grid size is confirmed by measuring the CD uniformity on real SRAM pattern. CD uniformities are measured 9.9 nm and 8.7 nm for grid size of 1 nm and 0.5 nm, respectively. 22% improvement of the CD uniformity is achieved. The decrease of OPC grid size is shown to improve not only the proximity correction, but also the uniformity.