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윤준호,임정식,우경철,김명수,김상규 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
Effect of chemical substitution at the para-position of the thiophenoxyl radical has been theoretically investigated in terms of energetics, structures, charge densities and orbital shapes for the ground and first electronically excited states. It is found that the adiabatic energy gap increases when CH3 or F is substituted at the para-position. This change is attributed to the stabilization of the ground state of thiophenoxyl radical through the electron-donating effect of F or CH3 group as the charge or spin of the singly-occupied molecular orbital is delocalized over the entire molecule especially in the ground state whereas in the excited state it is rather localized on sulfur and little affected by chemical substitutions. Quantitative comparison of predictions based on four different quantum-mechanical calculation methods is presented.
윤준호,Gwak Ho-Shin,Kwon Ji-Woong,Shin Sang-Hoon,Yoo Heon 대한말초신경학회 2017 The Nerve Vol.3 No.2
Objective Lumboperitoneal (LP) shunt has not been commonly used due to frequent over-drainage and malfunction. We adapted an LP shunt with a valve reservoir or programmable valve for use in patients who needed to avoid cranial surgery. We compared the clinical results of the LP shunt with a ventriculoperitoneal (VP) shunt. Methods Among 188 shunt installations, we selected 132 patients who received a first-time shunt installation (108 VP shunt and 24 LP shunt) to compare clinical improvement, shunt malfunction, over- and under-drainage, and infection rates along with clinical factors between the two groups of patients. Results Clinical improvement occurred in 107 (80%) patients. The rates of clinical improvement were not significantly different between two groups. Malfunction and infection was recorded in 15 (11%) patients and in 8 (6%) patients, respectively. The incidence for malfunction and infection were not significantly different between two groups. Over-drainage and under-drainage were recorded in 19 patients, each. The need for valve adjustment was not significantly different between two groups (p=0.46). Shunt revision was performed in 31 (24%) patients. The proportion of patients received revisions in the LP shunt group tended to be greater (9/24) compared with the VP shunt group (22/108) (p=0.07). However, the total revision rates (number of revision/total shunt) were not significantly different between the two groups (p=0.74). Conclusion We suggest clinical efficacy of LP shunt with a valve reservoir is compatible with VP shunt, and recommend use of this system in patients with communicating hydrocephalus.
Acute Spontaneous Subdural Hematoma of Arterial Origin
윤준호,Youngbo Shim,Gwak Ho-Shin,Kwon Ji-Woong,Lee Sang-Hyun 대한말초신경학회 2017 The Nerve Vol.3 No.1
A spontaneous subdural hematoma (SDH) occurred in a 43-year-old woman during hospital administration. She had received endoscopic thyroidectomy for alleged papillary thyroid carcinoma. By chance, she had a wound infection complicated from esophageal perforation. Therefore, she had to have parenteral nutrition to avoid per os administration of food materials. Five days after the operation, she received central line insertion uneventfully. However, 30 min later, she complained headache and lost consciousness in a few min. Brain CT revealed acute SDH of right hemisphere with severe midline shift. Emergency craniotomy revealed acute SDH. At the end of the removal of hematoma, small cortical artery at temporoparietal lobe was found to be ruptured. Spontaneous SDH form of arterial rupture has been rarely reported. All reported cases have a sudden onset headache followed by neurological deficit mostly progressed to comatose status. The verified origin of bleeding is a cortical artery near the temporal or parietal lobe.