13Cr 마르텐사이트계 스테인리스강의 기계적성질에 미치는 Mo 첨가의 영향

김기엽,정병호,김무길,박찬,안용식 ( Ki Yeob Kim,Byung Ho Jung,Mu Gil Kim,Chan Park,Yong Sik Ahn ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.3

N/A 13%Cr martensitic stainless steel was microalloyed with 0∼1.5%Mo, and the mechanical properties were tested at the various heat treated conditions. Mo addition increased austenitization temperature(Ac1), and had little influence on the hardness and tensile properties at the annealed condition. The higher the austenitizing temperature, the higher the hardness and tensile strength, but Mo addition decreased those properties. The impact energy after austenitization increased with addition of Mo. The decrease of mechanical properties and increase of impact energy of Mo-alloyed steel after austenitization are thought to be caused by formation of ductile δ-ferrite phase in the microstructure.

좌측 하악 과두부에 발생한 방선균증의 증례보고

김기엽(Ki-Yeob Kim),윤규호(Kyoo-Ho Yoon),전인성(In-Sung Jun),김태열(Tae-Youl Kim),장정용(Jung-Yong Jang),반재혁(Jae-Hyurk Ban) 대한구강악안면외과학회 2004 대한구강악안면외과학회지 Vol.30 No.3

Actinomycosis is a rare form of disease that is caused by Actinomyces such as A. israelii and A. bovis, which may take the form of chronic, purulent inflammation of deep tissue evolves with necrosis, formation of sinuses and fibrotic mass. This disease arises in the head and neck area mainly in 55% and other places like that chest and the gastrointestinal tract occurs in 45%. Actinomycosis can present in a variety of forms and may mimic other infections or even neoplasms. Our case was 44-year-old man having painful indurated mass in his left TMJ area, otorrhea in his left ear and trismus. He was treated with surgical excision and biopsy confirmed actinomycosis. And after that, he was cured successfully with antibiotic therapy. We report this case of actinomycosis that developed in the left TMJ area with review articles.

경부 및 상지의 통증치료를 위한 성상신경절의 경피적 고주파 열응고술 - 증례 보고 -

김지영(Ji Young Kim),김기엽(Ki Yeob Kim) 대한통증학회 2001 The Korean Journal of Pain Vol.14 No.2

N/A

W치환 2205 이상 스테인리스강의 크리프 특성 평가에 관한 연구

김기엽,최병호,남기우,안용식 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.1

22Cr-5Ni 2상 스테인리스강의 합금원소 중 몰리브덴(Mo) 원소를 텅스텐(W)으로 치환하여 크리프거동에 미치는 영향을 조사하였다. 크리프시험은 600℃와 650℃의 온도에서 실시하였다. 650℃ 크리프 시에는 취약한 금속간화합물인 σ상이 석출하였으며 이것은 크리프수명을 급격히 감소시키는 역할을 하였다. Mo에 대한 W원소의 치환은 일반적으로 σ상의 석출을 지연시킨다고 알려져 있으나, 2wt.%까지 W 치환을 실시한 본 연구범위에서는 크리프 수명 및 최소 크리프속도에 뚜렷한 영향을 미치지 못하였다. 크리프손상의 정도를 평가하기 위하여 크리프시편에 대한 초음파검사를 실시하였다. 크리프온도 600℃에서는 크리프시편의 수명이 증가함에 따라 음속이 비례적으로 증가하였으나 650℃에서는 반대로 감소하였다. The effect of the substitution of Tungsten(W) for Molybdenum(Mo) on the creep behaviour of 22Cr-5Ni duplex stainless steel(DSS) has been investigated. Creep tests were carried out at 600℃ and 650℃. Intermetallic σ phase is precipitated during creep at 650℃, at which creep rupture time was much lower compared with at 600℃. The substitution of W for MO in the duplex stainless steel was known to retard the formation of σ phase. Minimum creep rate and creep rupture time, however, were hardly influenced by the substitution of 2wt.% W. An ultrasonic measurement for the creep specimens has been carried out for the evaluation of creep damage. The sound velocity increases propotionally with the increase of creep rupture time at 600℃ of creep temperature. On the contrary, the sound velocity decreases with the increase of rupture time at 650℃, which can be correlated with the microstructural evolution during creep.

복강경 수술시 환자체위와 기복시간의 경과가 동맥혈 이산화탄소 분압과 호기말 이산화탄소 분압의 변화에 미치는 영향

김영숙,김기엽,이미성,김미 대한마취과학회 1995 Korean Journal of Anesthesiology Vol.29 No.4

During laparoscopic surgery with carbon dioxide (CO₂) pneumoperitoneum, PaCO₂ (arterial CO₂ gas tension) and P(ET)O₂ (end-tidal CO₂ gas tension) will be affected by the durations of CO₂ pneumo-peritoneum and the body positions. PaCO₂ and P(ET)CO₂ were investigated 5 minutes after induction of general anesthesia(control value), 10 minutes, 30 minutes and 60 minutes after CO₂ gas insufflation, and 15 minutes after CO₂ gas excretion. Seventy-two patients undergoing laparoscopic surgery under general anesthesia were allocated to two study groups: group I, laparoscopic appendectomy under the Trendelenburg position; group II, laparoscopic cholecystectomy under the reverse Trendelenburg position. In results, PaCO₂ and P(ET)CO₂ were significantly increased during laparoscopic surgery that associated with times of CO₂ pneumoperitoneum. PaCO₂ and P(ET)CO₂ at 60 minutes after CO₂ gas insufflation were increased from P(ET)CO₂ control value 35.8±4.2 mmHg, P(ET)CO₂ . control value 34.0±3.6 mmHg to P(ET)CO₂ . 39.98.0 mmHgP(ET)CO₂ 42.3±4.7 mmHg(p$lt;0.05). PaCO₂ and PO in group I were more increased compared with group II. PaCO and P(ET)CO₂ in group I were increased from PaCO₂ control value 35.9±4.8 mmHg, P(ET)CO₂ control value 34.9±3.7 mmHg to PaCO₂ 45.7±2.5 mmHg, P(ET)CO₂ 48.0±3.6 mmHg(p$lt;0.05), in group II from PaCO₂ control value 35.7±3.2 mmHg, P(ET)CO₂ control value 32.8±3.0 mmHg to PaCO₂ 38.4±8.3 mmHg, P(ET)CO₂ 40.4±3.2 mmHg(p$lt;0.05). In conclusion, to minimize the risk of a carbon dioxide retension during laparoscopy especially under the Trendelenburg position, we recommend that ventilation should be adjusted to to the normal range of PaCO₂ and P(ET)CO₂.

내시경적 흉부 교감신경절 소작술을 이용한 본태성 다한증의 치료

김영숙,김기엽,김인세 대한마취과학회 1997 Korean Journal of Anesthesiology Vol.33 No.1

Background : Palmar and axillary hyperhidrosis causes important consequences to the social and professional life of the affected patient. Endoscopic thoracic sympathectomy is considered the treatment of choice, because it causes minimal morbidity and high initial success rates. Therefore we used a single-site access technique for primary hyperhidrosis patients. Method : The operation was done under general anesthesia with the patient in a half-sitting position. Through an incision made along the line between lateral ⅓portion of the clavicle and ipsilateral nipple, a Verres needle was introduced below the second rib. About 1.5L of CO2 was insufflated into the pleural cavity. The needle was changed to a 5 mm trochar through which the electroresectoscope was introduced. The heads of the upper 2nd-4th ribs were identified and the sympathetic chain could be seen through the pleura riding over the ribs close to the costovertebral junction. The 2nd-4th ganglia were coagulated and divided down to the periosteum. Finlly the lung was expanded by limiting flow until the airway pressure reach 30∼40 cmH2O. The wound was closed after the removal of electroresectoscope. The procedure was then repeated on the opposite side. Result : There were no postoperative mortality and major complications requring surgical reintervention. The preoperatively wet and cold hands had became warm and dry immediately after operation. All patients were very satisfied. Conclusion : Endoscopic thoracic sympathetic ganglion cauterization is a minimally invasive and highly successful treatment for the patients with primary hyperhidrosis. (Korean J Anesthesiol 1997; 33: 133∼138)

고칼륨혈증 환자에서의 심정지

박광원,김기엽,남용택 대한마취과학회 1991 Korean Journal of Anesthesiology Vol.24 No.5

A 69 year-old male patient was admitted for lumboperitoneal shunt operation due to normotensive hydrocephalus. There was not significant laboratory findings except slightly increased serum potassium(5.0 mEq/1). But we ignored this hyperkalemia probably due to hemolysis because ECG at word and operation room did not reveal any evidence of hyperkalemia. Following induction of an anesthesia with fentanyl 100 ug thiopental(2.5%) 100 mg injection, succinylcholine 60 mg was administered intravenously, and endotracheal intubation was performed. Vecuronium 5 mg was administered intravenously for neuromscular blook. Anesthesia was maintained with nitrous oxide, oxygen and enflurane. During the course of operative procedure, his vital signs were stable(blood pressure 120/70 mmHg, pulse 60/min). After lumboperitoneal shunt was completed without problem, neostigmine 5 mg and glycopyrrolate 0.2 mg was administered for reversal of vecuronium. About 10 minutes after arrival in recovery room, his general condition deteriorated suddenly and radial arterial pulse could not be palpated. Radial arteiial blood pressure wave did not appear and ECG showed asystole and stand-still. Cardiopulmonary resuscitation(CPR) was started with Ambu-bagging, sodium bicarbonate and epinephrine injection with external cardiac massage, but the immediate response was not so good. We re-examined the patients chart and found the past history of chronic renal function impairment. CPR was directed for hyperkalemia including calcium chloride, sodium bicar-bonate and 10% dextrose with insulin. At 5 minutes after CPR, ECG showed regular sinus rhythm with stable vital signs. But ECG still showed hyperkalemic pattern(high tented T wave and prolonged P-R interval). After vigorous and continous treatment for hyperkalemia in recovery room, he regained consciousness and he was transfered to the neurosurgical intensive care unit for further evaluation and treatment. Postoperative course was relatively good and he was discharged on 25th postoperative day without any sequale of cardiac arrest.