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유병훈,금성민,이창언,Seungro Lee 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1
The effects of the number of heat exchanger modules on thermal characteristics were experimentally studied in a premixed combustionsystem with a cross-flow staggered-tube heat exchanger. The various heat exchanger modules, from 4 to 8, combined with a premixedburner were tested to investigate the performance of the heat exchanger through the surface area of the heat exchanger at various equivalenceratios. Additionally, the performance of the heat exchanger was analyzed by applying entropy generation theory to the heat exchangersystem. As a result, although the heat transfer rate increases with the increase of the equivalence ratio, the NOx and CO concentrationsalso increase due to the increasing flame temperature. In addition, the entropy generation increases with an increase of theequivalence ratio. Furthermore, the heat transfer rate and the effectiveness are increased with the increase of the number of the heat exchangermodules. Also, the effectiveness is sharply increased when the number of the heat exchanger modules is increased from 4 to 5. Consequently, the optimal operating conditions regarding pollutant emission, effectiveness and entropy generation in this experimentalrange are 0.85 for the equivalence ratio and 8 for the number of heat exchanger modules.
兪炳勳,宋哲鏞,李純炯 중앙대학교 의과대학 의과학연구소 1977 中央醫大誌 Vol.2 No.1
The experiment was designed to understand the humoral immune response of albino rat host against Paragonimus iloktsuenensis infection by demonstrating the Sarles' phenomenon. Rats of experimental groups were infected with the metacercariae of P. iloktsuenensis which were isolated from brackish water crab, Sesarma dehaani, and were kept for 3 days, 4 weeks, 10 weeks and 14 weeks of infection period. After the given infection period, live excysted metacercarise of P. iloktsuenensis mixed with the serum of the infected rats were placed on the hole glass slide and incubated at 37℃. These slides were examined microscopically at 24 hours and 48 hours after incubation. Control groups were consisted of 1) uninfected rats, 2) uninfected rats injected intramuscularly with prednisolone 10㎎/㎏ every other day, 3) infected rats injected intramuscularly with prednisolone 10㎎/㎏ every other day. Same procedures as experimental groups were carried on. The results obtained were as follows. 1) Precipitations were formed around the excysted metacercariae in the experimental groups. The precipitations were most prominent around the oral sucker. 2) Sarles' phenomenon was positive in all the experimental groups of 10 weeks and 14 weeks of infection period. 3) There were no correlations between the number of worms discovered at the infected rats and the intensity of the precipitate formation. 4) Sarles' phenomenon was negative in all the control groups.
Duchenne형 근이영양증 환아의 척추측만증 교정술 마취 1예
유병훈,이상석,연준흠,김정원,홍기혁 인제대학교 1998 仁濟醫學 Vol.19 No.1
Duchenne형 근이영양증 환자는 술중과 술후에 다양한 부작용이 발생할 수 있기 때문에 많은 주의를 요한다. 특히 전신마취에 흔히 사용되는 흡입마취제 및 Succinylcholine 등에 의해 쉽게 악성고열증에 빠지게 됨으로써 마취시에는 이들 약제의 사용 및 악성 고열증에 주의해야만 하며 또한 반드시 발생하는 심근에 대한 근이영양증 때문에 심혈관 부작용도 주의하여야 한다. 저자들은 척추측만증 교정술이 예정된 Duchenne형 근이영양증 환아에서 유발되는 요소를 제거하고 마취시에 안정하다고 알려진 약제들을 사용하여 악성 고열증 및 수술후의 부작용의 발생없이 성공적으로 마취를 시행하였기에 문헌고찰과 함께 보고하는 바이다. Patients with Duchenne muscular dystophy(DMD) are susceptible to numerous adverse intraoperative and postoperative side effects of anesthetic agents. One of the most serious side effect is malignant hyperthermia (MH). A succesful anesthesia were done in a patient with DMD with the drugs safe for malignnant hyperthemia. A 14 years old boy with DMD operated for spinal fusion under general anesthesia. We performed safe general anesthesia without instance of malignant hyperthermia and side effacts. The anesthetic management included primarily intravenous general anesthetics with minimal myocardial depressant effects, avoiding succinylcholine and inhalation agents. We used vecuronium for muscle relaxation, nitrous oxide, propofol and fentanyl.
유병훈,우승훈 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5
Interventional neuroradiologic procedure represents treatment of central nervous system disease by endovascular access for the purpose of delivering therapeutic agents, including both drugs and devices. For optimal anesthetic management, anesthesiologists should be familial with specific radiological procedures and their potential complications. The role of the anaesthetist in INR consists in providing patient comfort by analgesia and sedation, adequate monitoring, maintenance of vital functions and(if required) the management of systemic heparinisation. The patient's underlying condition, the duration and the kind of intervention have to be considered to decide on the anaesthetic management. Knowledge of the risks and hazards of the different procedures and close collaboration with the neuroradiologist form the basis for appropriate management in case of a potentially fatal ischemic or haemorrhagic complication. For prompt control of airway, respiration and blood pressure in these emergencies experienced anaesthesia staff is required.
유병훈,이용완,이순호 안동대학교 사범대학부속 과학교육연구소 1998 과학교육연구소논문집 Vol.1 No.-
본 논문에서는 수학 수업에서 학생들의 학습효과를 높이고 흥미를 유발시킬 수 있는 효과적인 수업 방법에 대해 조사하였다. In this paper, we investigate effective teaching method in mathematics class to improve learning outcomes and motivate students interests.