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최대 비틀림 파 발생을 위한 자기변형 패치 형상의 위상최적화
선경호(Kyung Ho Sun),조승현(Seung Hyun Cho),김윤영(Yoon Young Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This research is concerned with the topology design optimization of a magnetostrictive patch with the consideration of the coupling between magnetic field and mechanical deformation. Earlier investigations consider the optimization of magnetic systems only. Because the maximization of the torsional wave generated by the patch is to be achieved, the shear stress at the target location of the test specimen where the patch is bonded is used as the objective function. Therefore, not only the patch shape but also patch bonding status must be simultaneously solved in the present problem. This requires the use of two design variables at every finite element discretizing a given design space. The numerical results obtained by the present investigation were found to agree well with the earlier experimental results.
위축성 심낭염 [Constrictive Pericarditis]을 동반한 양측성 섬유흉 [Fibrothorax] 치험 1
선경,김요한,백광제,이철세,김학제,김형묵,Sun, Kyung,Kim, Yo-Han,Baek, Kwang-Je,Lee, Chol-Sae,Kim, Hark-Jei,Kim, Hyoung-Mook 대한흉부심장혈관외과학회 1984 Journal of Chest Surgery (J Chest Surg) Vol.17 No.4
Fibrothorax is the end stage of chronic pathologic processes of pleura such as hemothorax, empyema, or tuberculous effusion. The pleural space become adherent and obliterated, and the lung parenchyma is covered by a thick, fibrous, unexpandable "peel", so the lung function is diminished markedly with impaired ventilation and oxygenation. Constrictive pericarditis is often accompanied fibrothorax, also cardiac and hemodynamic function is deteriorated. Surgical relief of these fibrous peels causes remarkable improvement in pulmonary function, cardiac and hemodynamic function, and subjective symptoms. We experienced a case of bilateral fibrothorax combined with constrictive pericarditis which occured 3 years after bilateral tuberculous effusion. Decortication and percardiectomy were done at the same time through bilateral submammary thoracotomy with sternal transection. Comparing postoperative Peripheral venous pressure, Circulation time, Pulmonary function test, Arterial blood gas analysis, Subjective symptoms with preoperative conditions showed noticeable improvement.provement.
선경,이철세,백광제,김요한,김학제,김형묵,Sun, Kyung,Lee, Chol-Sae,Baek, Kwang-Je,Kim, Yo-Han,Kim, Hark-Jei,Kim, Hyoung-Mook 대한흉부심장혈관외과학회 1984 Journal of Chest Surgery (J Chest Surg) Vol.17 No.4
Pure Red-Cell Aplasia [P.R.C.A.] is rare disease characterized by absence of erythroid precursors in the bone marrow, normocytic normochromic anemia with profound reticulocytopenia in the peripheral blood, and relatively or completely spared granulopoiesis and thrombopoiesis. The association rates of P.R.C.A. with Thymoma is approximately 50%, but only 5-10% of all patients with a Thymoma have a P.R.C.A.. P.R.C.A. is thought to be a variety of autoimmune disease, and humoral inhibitor, i.e. IgG, has been demonstrated experimentally. Its treatments such as thymectomy, immunosuppressants, steroid, androgenic hormone, and splenectomy have been tried but the result is not satisfactory and the prognosis is poor. We experienced a case of P.R.C.A. with Thymoma treated with thymectomy and postoperative steroid therapy, and which showed good postoperative recovery clinically and hematologically.
선경,백광제,이철세,채성수,김학제,김형묵,Sun, Kyung,Baek, Kwang-Je,Lee, Chol-Sei,Chae, Sung-Soo,Kim, Hark-Jei,Kim, Hyung-Mook 대한흉부심장혈관외과학회 1984 Journal of Chest Surgery (J Chest Surg) Vol.17 No.1
Congenital Cystic Adenomatiod Malformation (C.C.A.M.) is rare, but one of the most common congenital pulmonary anomalies that cause acute respiratory distress in the newborn infants. It is characterized and differentiated from the diffuse pulmonary cystic disease pathologically, i.e. adenomatoid appearance due to marked proliferation of the terminal respiratory components. An 2/12 year old male patient was suffered from respiratory distress and cyanosis on crying since birth, but no specific therapy was given. With progression of symptoms, he came to Korea University Hospital for further evaluation and then transfered to Dept. of Chest Surgery for operative correction under the impression of Congenital Obstructive Emphysema suggested by a pediatrician. On gestational and family history, there was nothing to be concerned such as congenital anomaly. Physical examinations showed; moderate nourishment and development (Wt. 5.5kg), cyanosis on crying, both intercostal and lower sternal retraction on inspiration, Lt. chest building with tympany, Rt. shifting of cardiac dullness, decreased breathing sound with expiratory wheezing on entire Lt. lung field, decreased breathing sound on Rt. upper lung filed, and tachycardia. The remainders were nonspecific. Laboratory findings were normal except WBC $14000/mm^3$ (lymphocyte 70%), Hgb 9.8m%, Hct 28%, negative Mantaux test, and sinus tachycardia and counter-clockwise rotation on EKG. Preoperative simple Chest PA revealed marked hyperlucent entire Lt. lung, herniation of Lt. upper lobe to Rt., collapsed Rt. upper lobe, tracheal deviation and mediastinal shifting to Rt., and no pleural reaction. At operation, after Lt. posterolateral thoracotomy, 4th rib was resected. Operative findings were severe emphysematous changes limited to both lingular segmentectomy was done. The resected specimen showed slight solidity, measuring $8{\times}4.5{\times}2cm$ in size, and small multiple cystic spaces filled with air. Microscopically, entire tissue structures were glandular in appearance, cyst were lined by ciliated columnar epithelium, and occasional cartilages were noted around the cystic spaces. Bronchial elements were dilated but normal pattern on histologically. The patient had a good postoperative courses clinically and radiologically, and discharged on POD 10th without event. The authors report a case of Cogenital Cystic Adenomatoid Malformation (C.C.A.M.)
태양열 이용 열펌프 시스템에 의한 태양열 연구실 난방에 관한 연구 (Ⅰ)
선경호(Kyung-ho Sun),정현채(Hyun-chai Jung) 한국태양에너지학회 1994 한국태양에너지학회 논문집 Vol.14 No.3
약 6평 규모의 실내의 온수 순환 난방에 적용될 수 있는 최적 설계조건 하에 제작 설치된 신개발 태양열 시스템의 열적 성능과 실내의 난방효과를 분석한 결과, 신개발 태양열 시스템의 온수순환 난방 방법이 실내난방에 가능함을 확인했다. 본 실험에서 사용된 신개발 태양열 난방시스템은 서울지방 가을철(10월과 11월)의 외기온도에서 실내온도가 18℃~20℃로 되는 범위내에서 최대의 효율을 나타내도록 설계하였다. A study discovered the possibility that new solar hot water circulating method make the room heat. A study proved the best conditions to use hot water circulating system in the room that is about 20㎡, The new system is designed to show the best efficiency that the room temperature make l8~20℃ in Seoul during November and December.
한국산 P.V.C.의 생물학적 안정도 및 적합성에 대한 실험적 고찰
선경,Sun, Kyung 대한흉부심장혈관외과학회 1984 Journal of Chest Surgery (J Chest Surg) Vol.17 No.1
These biologic test procedures are designed to test the suitability of P.V.C. made in Korea intended for parenteral preparation, which were based on the U.S. Pharmacopeia XIX "Biologic Test-Plastic Container", Official from July 1, 1975. Healthy adult human blood and rabbits weighing 2\ulcorner.2Kg were used for test materials. Sample P.V.C. were sampled from the medical equipments made in Korea randomly and Control P.V.C. were sampled from the standardized Cobe and Polystan P.V.C. tubes. P.V.C. extract was prepared from a homogeneous P.V.C. samples by incubating 60 square centimeters of the sample per 20 millimeters of sterile pyrogen-free saline at 70\ulcorner for 72 hours or autoclaving at 120\ulcorner for 1 hour. The Implantation Test was designed to evaluate the reaction of living tissue to the plastic by the method of the implantation of the Sample itself into animal tissue. The Systemic Injection Test, the Intracutaneous Test, and the remainders were designed to determine the biological response of animals to plastics by the single-dose injection of specific extracts prepared from a Sample. The results are as follows; 1.Implantation Test - No significant difference for reactions was noted between the Sample treated animal and the Control after 72 hours of implantation. 2.Systemic Toxicity Injection Test - No sign of toxicity and/or death immediately after injection and at 4, 24, 48 hours respectfully after injection. 3.Intracutaneous Test - None of the animals treated with the Sample showed a significantly greater reaction than the observed in the animals treated with Blank. 4.Pyrogen Assay-Only one animal treated with the Sample showed the maximal rise of rectal temperature about 0.2\ulcorner after 3 hours of injection, but remainders showed no change. 5.Hemolytic Index - The positive Control tube of distilled water exhibited complete hemolysis while the negative Control tube and P.V.C. extract were negative demonstrating no hemolysis. 6.Cell Morphology of Erythrocytes and Leukocytes on Stored, Heparinized Human Blood -- There was no significant difference in the morphology of either the Control or Sample extract. 7.Clotting Mechanism of Human Blood in vitro - After allowing to the P.V.C. extract at room temperature for 5 Hours and at 10\ulcorner for 24 hours, there was no appreciable difference in Prothrombin Time under these conditions. 8.Clotting Mechanism of Rabbit in vivo - At the termination of 5 days after intraperitoneal injection of the P.V.C. extract, no significant changes in Clotting Time were observed. According to the above results, it could be concluded that the P.V.C. made in Korea was acceptable for parenteral preparation, especially treated with physiologic saline and/or human blood.man blood.
선경,채성수,이철세,백광제,김학제,김형묵,Sun, Kyung,Chae, Seong-Soo,Lee, Chul-Sae,Baek, Kwang-Jei,Kim, Hark-Jei,Kim, Hyong-Mook 대한흉부심장혈관외과학회 1983 Journal of Chest Surgery (J Chest Surg) Vol.16 No.1
Pectus Excavatum is a congenital anomaly of the anterior chest wall with a sharp concave curvature of the body of the sternum, from above downward and from side to side, especially just before the junction of gladiolo-xiphoid. We have experienced 14 cases of Pectus Excavatum with several operative procedures, i.e., Ravitch operation in 1 case, Wada operation [Sternal turn-over} in 3 cases, Wada operation and K-wire splint in 5 cases, Modified Wada operation [Rectus Abdominis muscle pedicle attached sternal turn-over] in 5 cases. Nearly all patients developed flail chest treated with internal fixation, and necrotic chondritis was developed postoperatively and treated with excision and curettage in one case with Wada operation. Follow-up Vertebral Index showed 48% preoperatively and 33% postoperatively, average decrement of 15%. We report 14 cases of Pectus Excavatum and their operative treatments.