HEVC 부호화 부가정보를 이용한 장면전환 검출 연구

엄유미(Yumi Eom),박상일(Sangil Park),정창우(Chang Woo Chung) 한국방송·미디어공학회 2015 방송공학회논문지 Vol.20 No.6

국내 도시철도 차량을 위한 FRACAS 기반의 신인성 관리 플랫폼 연구

장건(Geon Jang),정창우(Chang Woo Chung),심동하(Dongha Shim) 한국IT서비스학회 2020 한국IT서비스학회지 Vol.19 No.3

This paper describes a study on the FRACAS(Failure Reporting Analysis and Corrective Action System)-based dependability control platform for domestic urban railway trains. There are more demands for the verification of the dependability of trains as it becomes a regulation for train manufacturers to verify the dependability recently. Train manufacturers as well as railway operators need a effective FRACAS solution to perform the verification of the dependability. Yet current FRACAS solutions have limitations to support the verification processes effectively. This paper addresses the issues of current FRACAS solutions and suggests a FRACAS framework designed for the domestic urban railway trains. Service failure scenarios are standardized using the proposed availability model to implement a more user-friendly and reliable platform. A new FRACAS-based platform for the dependability control (SCARF??) has been developed to implement the suggested framework. The detail interfaces and functions of the platform are explained. The SCARF?? platform is expected to engage the increasing demands for the dependability control successfully enhancing the reliability, maintainability, availability and safety of domestic urban railway trains eventually.

진행위암 수술후 복강내 온열관류요법 시행시 저체온 마취에 대한 고찰

정창우,임청현 대한마취과학회 1994 Korean Journal of Anesthesiology Vol.27 No.11

Intraperitoneal hyperthermic perfusion(IPHP) is gaining popularity in the world as a method of prevention and treatment of peritoneal metastasis following gatrointestinal cancer. The procedure presents significant problems to the anesthegiologist with regard to tempera- ture control, fluid and electrolyte balance, acid-base change and postoperative care. During IPHP, there is a potential for heat gain from the peritoneal cavity. Several workers have reported a significant increase in core temperature. Therefore, it is true that accurate monitoring of temperature is essential. We studied that acid-base balance, electrolyte balance, level of blood suger following core temperature change in Intraperitoneal Hyperthermo-chemotherapeutic Perfusion patients.

경유돌공 부위에서 전기신경자극기를 이용한 안면경련 환자의 치료

정창우,민진혜,이규탁 관동대학교 의과학연구소 2000 關東醫大學術誌 Vol.4 No.1

Facial spasm is the most common in middle aged women, which is a distressing condition characterized by involuntary, intermittent, unilateral twitching of the muscles innervated by the facial nerve. There are various treatments for facial spam, such as neurovascular decompression, local injection of botulinum, facial nerve compression at stylomastoid foramen and facial nerve block with O'Brien method. There are the same clinical problems associated with the reported procedure in pain clinic, such as severe pain and recurrence of spasm. In this paper, we report the modified facial nerve block using electric nerve stimulator at the stylomastoid foramen. This new technique will be able to reduce the pain and the discomfort during facial nerve block, and reduced the recurrence of facial spasm.

제 삼대구치 발치의 병발증 : Deep Neck Infection, Mediastinitis, Plueral Effuison and Pericardial Effusion 심경부감염, 종격동염, 농흉, 흉막 삼출, 심낭 삼출

문재필,정창우,김은석 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.2

Severe complications like as mediastinitis, pericardial effusion from odontogenic infection are very rare in antibiotic era, but its mortality is very high when it occured. The sign and symptoms may be obscure sometimes, it is difficult to diagnose and treat the deep neck infection and other sequela exactly. The treatments of the complex odontogenic infection ares aggressive surgical drainage with placement of proper drain and administration of high dose of antibiotics as early as possible The authors report a case of complications induced from a third molar extraction.

척추수술환자에서 급성 동량성 혈액희석 및 유도저혈압을 병용한 마취관리

이규탁,민진혜,정창우 관동대학교 의과학연구소 2000 關東醫大學術誌 Vol.4 No.1

Due to the discovery that blood transfusion can evoked several side effects, there has been increased interest in technologies that reduce the amount of homologous blood used during and after surgery. Acute normovolemic hemodilution is known as a convinient and effective blood conservation method, and drug-induced hypotension can reduce the amount of intraoperative bleeding with better operative field. Combination of these two techniques was suggested to reduce homologous blood requirements in various surgeries. Therefore, to minimize homologous blood transfusion, we conducted general anesthesia using acute normovolemic hemodilution combined with induced hypotension in patient undergoing spinal fusion surgery. We think that the routine careful combination of these techniques can be carried out safely in many surgeries.

경골 근위부 자가 망상골을 이용한 치조열 골 이식술

김학균,김은석,문재필,정창우 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.2

Two cases of alveolar bone graft with autogenous cancellous bone from proximal tibial metaphysis was done. Satisfactory amount and quality of autogenous cancellous bone was obtained. Considering its overall lack of morbidity, the proximal tibial metaphysis is a useful donor site for small to moderate bone defect in oral & maxillofacial region.

복강경하 담낭절제술시 환기 및 심혈관계 변화

이재철,이인배,이상록,김홍렬,정창우,고활영 대한마취과학회 1996 Korean Journal of Anesthesiology Vol.30 No.4

Background: Laparoscopic cholecystectomy has emerged rapidly as a popular alternative to tradidonal laparotomy and cholecystectomy in the management of cholelithiasis. The advantages of shorter hospital stay, more rapid return to normal activities are combined with less pain associated with the small limited incisions. But it has some disadvantages related to insufflation of a large amount of carbon dioxide into peritoneal cavity. Methods: To investigate ventilatory and hemodynamic changes during laparoscopic cholecystectomy, we observed the changes in blood pressure (systole, diastole, mean), heart rate, end-tidal carbon dioxide tension (PerCO₂), arterial carbon dioxide tension(PaCO₂), and arterial oxygen tension(PaO₂) at intervals during general anesthesia with controlled ventilation (tidal volume: 10 mg/kg, ventilatory rate: 10 breaths/min). Results: Mean arterial pressure was increased significantly until 30 minutes after carbon dioxide insufflation(p$lt;0.05). Heart rate was not changed significantly thrhout the operation. End-tidal carbon dioxide tension and arterial carbon dioxide tension were increased significantly during carbon dioxide insufflation(p$lt;0.01), but arterial oxygen tension was not decreased significantly throughout the operation. Conclusion: This study described 19 patients who underwent laparoscopic cholecystectomy and analyzed the changes in hemodynamic and ventilatory parameters. It is important for anesthesiologist to monitor ventilation and hemodynamics carefully because the patients with cardiac or pulmonary diseases may be adversely affected by the hypercarbia associated with carbon dioxide insufflation.

천주 차단 (Tienchu block)을 이용한 후두통치료

정창우,민진혜 關東大學校醫科大學醫科學硏究所 1998 關東醫大學術誌 Vol.2 No.1

The occipital neuralgia starts with dull pain or stiffness of the posterior neck and occipital headache. When advanced, occipital neuralgia, eye general muscle and pain, contraction headache follow. It is frequently seen in pain clinic practice, either as an independent pbenomenon cause by fatigue or as the reffered symptom of other diseases. Tienchu is accupoint B-10 on the bladder meridian. It is situated at the depression adjacent to the upper lateral border of the trapezius muscle. The Tienchu syndrome is a myofasial condition of the posterior neck region with a trigger point. Therefore, a Tienchu block with local anesthetic is a most effective therapeutic method for many patients who complain of posterior headache or posterior neck pain.

Labetalol 에 의한 기관내 삽관시 혈압과 맥박수 상승의 억제효과

이호연,김홍렬,정창우,임청현 대한마취과학회 1994 Korean Journal of Anesthesiology Vol.27 No.11

Transient increases in blood pressure and heart rate following laryngoscopy and endotra- cheal intubation are common. These stress responses are greatly exaggerated in patients with hypertension and cardiovascular diseases and can lead to cardiac arrhythmia, pulmo- nary edema, and cerebral hemorrhsge. Many approaches have been tried to attenuate these potentially adverse circulatory responses but none has been satisfactory. This study was made to evaluate the hemodynamic responses to tracheal intubation using combined α-and β-adrenoreceptor blocking agent, labetalol. We intravenously administered labetalol or placebo prior to laryngoscopy and tracheal intubation in adult patients with ASA class 1, or 2. Sixty patients were randomly assigned to one of three treatment groups. Group 1 patients (control group,n=20) received normal saline 3ml, Group 2 patients (n=20) received labetalol 0.3mg/kg, and Group 3 patients (n= 20) received labetalol 0.6mg/kg intravenously. These drugs were injected 3 minutes before indtion with thiopental sodium (5mg/kg). Succinylcholine chloride 1.0mg/kg i.v. was used to facilitate endotracheal intubation. After the completion of intubation, nitrous oxide/oxygen with enflurane or isoflurane was administered. The blood pressure and heart rate were measured upon arrival in the operating room (baseline), immediately before intubation, immediately after intubation, 1 minutes after intubation and at 2, 3, 5, 7, 10 minutes after intubation. There were no significant differences in preinduction values of blood pressure and heart rate. A significant reduction in heart rate was observed in the group 3, group 2 in that order compared with the group 1. Similarly, systolic, diastolic and mean arterial pressure de- creased in labetalol groups, but was not significantly different in all groups. None of the patients experienced any untoward side effects, such as hypotension, aignificant bradycardia, bronchospasm or electrocardiographic ehanges. In conclusion, in patients with no history of hypertension or significant cardiac disease, labetalol 0.3 or 0.6mg/kg i.v. is better suited to blunting tachycardia than to blunting hypertension to laryngoscopy and intubation.