Transient State Theory of Significant Liquid Structure Applied to Nitrogen Oxides

김상형,박형석,김각중,장세헌,Kim, Sang-Hyung,Pak, Hyung-Suk,Kim, Kak-Choong,Chang, Sei-Hun Korean Chemical Society 1967 대한화학회지 Vol.11 No.3

액체구조의 천이상태이론을 아산화질소($N_2O$)와 사산화질소($N_2O_4$)에 적용하여 이 액체들의 상태합을 유도하였다. 이상태합들을 써서 각 액체의 몰부피, 증기압, 증발엔트로피, 임계점에서의 성질 등, 여러가지 열역학적양들을 계산한 결과 모두 실험치와 좋은 일치를 얻었다. The transient state theory of significant liquid structure is applied to nitrous oxide and nitrogen tetroxide. The partition functions for the two liquids are derived according to the transient state theory. The various thermodynamic properties; such as, molar volumes, vapor pressures, entropies of vaporization, and critical point properties agree well with the experimental values.

대동맥판치환술의 임상적 고찰

김상형,선현,Kim, Sang-Hyung,Sun, Hyun 대한흉부심장혈관외과학회 1992 Journal of Chest Surgery (J Chest Surg) Vol.25 No.8

From August, 1986 to December, 1990, aortic valve replacement was performed in 33 Patients at the Chonnam National University Hospital. Of the valves implanted 25 were St. Jude, 7 Duromedics, and 2 Bjork-Shiley. The hospital mortality rate was 6.1% and the late mortality was none. Follow-up was done on 28 surviving patients; mean follow-up period was 31.21$\pm$16.96 months. Valve-related and anticoagulant-related complications were none. The actuarial survival rate was 93.4% at 5 years.

하행흉부대동맥류(下行胸部大動脈瘤) 치험(治驗) 1례(例)

이동준,김상형,Lee, Dong June,Kim, Sang Hyung 대한흉부심장혈관외과학회 1976 Journal of Chest Surgery (J Chest Surg) Vol.9 No.1

Aneurysm of the Aorta is a grave disease mostly producing disabling symptoms and ultimate death by rupture and hemorrhage without surgical intervention. The author recently experienced one case of surgical correction of descending thoracic aortic aneurysm treated with excision of the aneurysm and replacement of Dacron artificial vessel under temporary external by pass technique in November, 10th, 1975. 9mm internal diameter arterial cannula was inserted into upper and below the aneurysm. Bypass time was about 1 hour. The case was 35 years old women who had small egg sized saccular aneurysm in the upper third of the descending thoracic aorta involving the 1t. subclavian artery. Histopathological diagnosis was arteriosclerotic. Immediate postoperative course had been uneventful except low pressure and pulse of the left arm. The follow-up was possible up to date about 3 months. The patient has been doing well with ordinary activities except mild left chest discomfort.

거대기종성 폐낭포증 1례 보고

이동준,김상형,Lee, Dong-Jun,Kim, Sang-Hyung 대한흉부심장혈관외과학회 1978 Journal of Chest Surgery (J Chest Surg) Vol.11 No.3

A case of Vanishing lung of right entire lung field in a man of 36 years of age was encountered at Dept. of Chest Surgery of Chonnam University Hospital. His chief complaints were cough, severe dyspnea and chest pain for about 14 years. Right pneumonectomy was done and gross finding was multiple chambered cysts of the right lung with thin epithelium. The review of the literatures was also done.

냉혈 K 심정지액의 임상적 이용

오봉석,김상형,이동준,Oh, Bong-Suc,Kim, Sang-Hyung,Lee, Dong-Joon 대한흉부심장혈관외과학회 1982 Journal of Chest Surgery (J Chest Surg) Vol.15 No.1

Cold blood potassium cardioplegia, by two types of the infusion systems, was used in 45 patients who were undergone the open cardiac operation. Method A [in 25 patients] was the syringe infusion system and method B [in 20 patients] was the pump infusion system. Cold blood potassium cardioplegic solution was used less amount on method B than method A. Serum potassium was often increased significantly on method A as a result of excessive infusion of cold blood potassium cardioplegic solution. But method B, excessive infusion of cold blood potassium cardioplegic solution was prevented by reperfusion of the previous infused cold blood potassium cardioplegic solution through the recirculation system. Alteration of infused rate and concentration of potassium in cold blood potassium cardioplegic solution during infusion [which might be suggested on the method A] could be controlled on method B.

내원시 저혈당이 당뇨병을 동반한 심근경색증 환자의 예후에 미치는 영향

김은정 ( Eun Jung Kim ),정명호 ( Myung Ho Jeong ),정인석 ( In Seok Jeong ),오상기 ( Sang Gi Oh ),김상형 ( Sang Hyung Kim ),안영근 ( Young Keun Ahn ),김주한 ( Ju Han Kim ),김영조 ( Young Jo Kim ),채성철 ( Shung Chull Chae ),홍택종 대한내과학회 2014 대한내과학회지 Vol.87 No.5

목적: 당뇨병 환자에게 철저한 혈당 조절은 논란의 여지가 있으며, 이에 당뇨병을 동반한 급성 심근경색증 환자의 내원 시 저혈당과 병원 내 주요 임상 사건 및 사망률 그리고 추적관찰 1년간 사망률과의 관계를 알아보고자 하였다. 방법: 2005년 11월부터 2012년 3월까지 KAMIR에 등록된 당뇨병이 동반된 급성 심근경색증 환자 5,249명을 혈당 수치에 따라서 저혈당을 보인 환자(≤ 70 mg/dL)를 I군(93명, 72.6± 11.0세, 여성 46.2%), 정상혈당을 보인 환자(> 70 and < 140)를 II군(1,262명, 71.3 ± 10.7, 여성 34.3%), 고혈당을 보인 환자(≥ 140)를 III군(3,894명, 70.3 ± 11.1, 여성 36.0%)으로 분류하여, 병원 내 주요 임상사건 및 1년 후 사망률과의 관계를 비교하였다. 결과: 각 군의 평균 연령은 I군(72.6 ± 11.0세), II군(71.3 ±10.7세), III군(70.3 ± 11.1세)으로 I군에서 연령이 높았다(p =0.006). I군에서 내원 시 비전형적인 증상 양상(p = 0.002), Killip class III-IV (p = 0.003), 심초음파을 이용한 좌심실 구혈률 40% 미만의 환자(p = 0.002), NSTEMI가 많았다(p = 0.001). 전체 대상 환자 5,249명 중 344명(6.6%)이 입원 중 사망하였으며, 이 중에서 I군 12명(12.9%), II군 66명(5.2%), III군 266명(6.8%)으로 I군에서 사망률이 유의하게 높았다(p = 0.006).다변량 회귀분석에서 나이(p = 0.001), Killip class III-IV (p =0.001), 뇌혈관 질환(p = 0.002), 만성 신부전증(p = 0.001), 급성 신부전증(p = 0.001), 심인성 쇼크(p = 0.001), 심실성 빈맥증(p = 0.005), 좌심실 구혈률 40% 미만(p = 0.001), 내원시 혈당 70 mg/dL 미만(p = 0.005)은 추적관찰 한 달간 사망률에 독립적인 예측인자이었다. 정상 혈당군에 비하여 저혈당 군에서 사망률이 유의하게 증가하였고(OR 3.571, 95% CI1.465-8.705, p = 0.005). 고혈당군에 비해 저혈당군에서 사망률이 유의하게 증가하였다(OR 4.088, 95% CI 1.757-9.511, p= 0.001). 그러나 추적관찰 1년간에서 내원시 혈당은 사망률의 유의한 예측인자가 아니었다(p = 0.428). 결론: 당뇨병을 동반한 심근경색증 환자의 내원 시 저혈당은 입원중과 추적관찰 한 달간의 사망률을 예측할 수 있는 예후인자였다. Methods: We analyzed 5,249 diabetic patients who enrolled in the Korean Acute Myocardial Infarction Registry from November 2005 to March 2013. The patients were divided into three groups according to their blood glucose level at admission; Group I:hypoglycemia (≤ 70 mg/dL), Group II: normoglycemia (70-140 mg/dL) and Group III: hyperglycemia (≥ 140 mg/dL). We assessed in-hospital mortality and the major adverse cardiac events based on blood glucose levels at admission. Results: The mean age was older in group I at 72.6 ± 11.0 years compared to 71.3 ± 10.7 in group II and 70.3 ± 11.1 in group III (p < 0.006). A total of 344 patients died during hospitalization. In-hospital mortality was higher in group I at 12.9%, compared to 5.2% in group II and 6.8% in group III (p < 0.006). Multivariable logistic regression analysis determined that the independent predictors of 1-month mortality were age, Killip class III-IV, cerebrovascular disease, chronic renal failure, acute renal failure, cardiogenic shock, ventricular tachycardia, ejection fraction < 40% and hypoglycemia in admission. The mortality rate at 1 month was significantly higher in group I compared to group II (odds ratio [OR] 3.571; 95% confidence interval [CI] 1.465-8.705, p = 0.005) compared to group II and group III (OR 4.088; 95% CI 1.757-9.511, p = 0.001). Conclusions: Hypoglycemia on admission was an important predictor of in-hospital and one-month mortality in AMI patients with diabetes mellitus. (Korean J Med 2014;87:565-573)

증례 : 혈액종양 ; Azacitidine 치료 후 폐 손상이 발생한 골수형성이상증후군 1예

김호철 ( Ho Cheol Kim ),김상형 ( Sang Hyung Kim ),안지환 ( Jee Hwan Ahn ),권혜미 ( Hye Mi Kwon ),최종한 ( Jong Han Choi ),김태형 ( Tae Hyung Kim ),이제환 ( Je Hwan Lee ) 대한내과학회 2014 대한내과학회지 Vol.87 No.4

In randomized phase 3 clinical trials azacitidine has been shown to prolong survival in patients with higher-risk myelodysplastic syndrome (MDS). Therefore, azacitidine therapy should be considered for treating MDS patients with higher-risk disease. A 78- year-old male was administered the first cycle of azacitidine treatment for higher-risk MDS. On day three of chemotherapy he complained of fever and dyspnea, and radiographic findings revealed bilateral perihilar-peribronchial infiltration and a small amount of pleural effusion. Considering the possibility of pneumonia, intravenous broad-spectrum antibiotics were administered and azacitidine therapy was discontinued. Upon improvement of the patient’s subjective symptoms and radiographic abnormalities, azacitidine therapy was resumed. However, fever and dyspnea developed again upon recommencement of azacitidine therapy. A diagnosis was made of azacitidine-induced lung injury and corticosteroid treatment was administered. Although lung injury is a rare complication induced by azacitidine, physicians should be aware of this life-threatening side effect. (Korean J Med 2014;87:496-500)

이질적 환경에서의 layering 되어진 멀티미디어 스트림 서비스

이홍기(Lee Heung-ki),김현정(Kim Hyun-Jung),김상형(Kim Sang-Hyung),김현정(Kim Hyun-Jung),신정아(Shin Jung-Ah),이성인(Lee Sung-In),유관종(Yoo Kawn-Jong) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1A

다양한 네트웍 환경에서의 멀티미디어 서비스에 대한 연구가 많이 이루어지고 있다. 그러나, 아직까지 멀티미디어 데이터의 양을 감당할 수 있는 네트웍 환경이 구성되어져 있지 않고 있다. 이러한, 가변적인 네트웍 환경에 적응하면서, 사용자의 욕구를 만족시키기 위한 연구가 활발히 이루어지고 있다. 그 중에서 layering 되어진 멀티미디어 데이터에 대한 연구가 많이 진행 중이다. 이에 본 논문은 이러한 layering data의 전송방법에 대하여 논하고자 한다.

감염성 승모판 심내막염의 중단기 수술 성적

안병희,전준경,유웅,류상완,최용선,김병표,홍성범,범민선,나국주,박종춘,김상형,Ahn, Byong-Hee,Chun, Joon-Kyung,Yu, Ung,Ryu, Sang-Wan,Choi, Yong-Sun,Kim, Byong-Pyo,Hong, Sung-Bum,Bum, Min-Sun,Na, Kook-Ju,Park, Jong-Chun,Kim, Sang-Hyung 대한흉부심장혈관외과학회 2004 Journal of Chest Surgery (J Chest Surg) Vol.37 No.1

Background: Infective endocarditis shows higher operative morbidity and mortality rates than other cardiac diseases. The vast majority of studies on infective endocarditis have been made on aortic endocarditis, with little attention having been paid to infective endocarditis on the mitral valve. This study attempts to investigate the clinical aspects and operative results of infective endocarditis on the mitral valve. Meterial and Method: The subjects of this study consist of 23 patients who underwent operations for infective endocariditis on the mitral valve from June 1995 to May 2003. Among them, 2 patients suffered from prosthetic valvular endocarditis and the other 21 from native valvular endocarditis. The subjects were evenly distributed age-wise with an average age of 44.8$\pm$15.7 (11∼66) years. Emergency operations were performed on seventeen patients (73.9%) due to large vegetation or instable hemodynamic status. In preoperative examinations, twelve patients exhibited congestive heart failure, four patients renal failure, two patients spleen and renal infarction, and two patients temporary neurological defects, while one patient had a brain abscess. Based on the NYHA functional classification, seven patients were determined to be at Grade II, 9 patients at Grade III, and 6 patients at Grade IV. Vegetations were detected in 20 patients while mitral regurgitation was dominant in 19 patients with 4 patients showing up as mitral stenosis dominant on the preoperative echocardiogram. Blood cultures for causative organisms were performed on all patients, and positive results were obtained from ten patients, with five cases of Streptococcus viridance, two cases of methicillin-sensitive Staphylococcus aureus, and one case each of Corynebacteriurn, Haemophillis, and Gernella. Operations were decided according to the AA/AHA guidelines (1988). The mean follow-up period was 27.6 $\pm$23.3 (1 ∼ 97) months. Result: Mitral valve replacements were performed on 43 patients, with mechanical valves being used on 9 patients and tissue valves on the other 4. Several kinds of mitral valve repair or mitral valvuloplasty were carried out on the remaining 10 patients. Associated procedures included six aortic valve replacements, two tricuspid annuloplasty, one modified Maze operation, and one direct closure of a ventricular septal defect. Postoperative complications included two cases of bleeding and one case each of mediastinitis, low cardiac output syndrome, and pneumonia. There were no cases of early deaths, or death within 30 days following the operation. No patient died in the hospital or experienced valve related complications. One patient, however, underwent mitral valvuloplasty 3 months after the operation. Another patient died from intra-cranial hemorrhage in the 31st month after the operation. Therefore, the valve-related death rate was 4.3%, and the valve-related complication rate 8.6% on mid-term follow-up. 1, 3-, and 5-year valve- related event free rates were 90.8%, 79.5%, and 79.5%, respectively, while 1, follow-up. 1, 3-, and 5-year valve- related event free rates were 90.8%, 79.5%, and 79.5%, respectively, while 1, 3-, and 5-year survival rates were 100%, 88.8%, and 88.8%, respectively. Conclusion: The findings suggest that a complete removal of infected tissues is essential in the operative treatment of infectious endocarditis of the mitral valve. It is also suggested that when infected tissues are completely removed, neither type of material nor method of operation has a significant effect on the operation result. The postoperative results also suggest the need for a close follow-up observation of the patients suspected of having brain damage, which is caused by preoperative blood contamination or emboli from vegetation, for a possible cerebral vascular injury such as mycotic aneurysm. 배경: 감염성 심내막염은 다른 심장질환에 비해 유병률과 사망률이 높고, 대부분의 임상연구가 대동맥판에 발생한 심내막염에 편중되어 있어, 승모판 심내막염에 대한 보고는 상대적으로 드문데 이에 대한 임상양상 및 수술 결과를 분석하여 보고하고자 한다. 대상 및 방법: 1995년 6월부터 2003년 5월까지 전남대학교병원에서 감염성 승모판 심내막염으로 단일 술자에 의해서 외과적 치료를 받았던 23 예을 대상으로 하였다. 2예는 인공판막 심내막염이었고 나머지 21예는 자가판막 심내막염이었다. 환자의 평균 연령은 44.8$\pm$15.7 (11∼66)세였고 연령분포에는 큰 차이가 없었다. 17예에서는 혈역학적 불안정이나 거대 우종으로 응급수술을 시행하였다. 수술 전 12예에서 울혈성 심부전, 4예에서 신부전, 2예에서 비장 및 신장경색, 2예에서 일시적 뇌손상, 1예에서 뇌농양 소견을 보였다. NYHA 기능 분류상 Grade II가 7예, Grade III가 9예, Grade IV가 6예이었다. 술 전 심초음파상 승모판 역류우세가 19예, 협착우세가 4예이었으며, 우종은 20예(86.9%)에서 관찰되었다. 혈액배양 검사상 10예(43.4%)에서 원인균이 동종되었는데 Streptococcus viridans 5예, methicillin sensitive Staphylococcus aureus 2예, 그리고 Corynebacterium, Haemophillis, Gernella 각각 1예씩 이었다. 수술 적응증은 ACC/AHA 지침에 근거하였으며, 평균 외래 추적관찰기간은 27.6$\pm$23.3 (1∼97)개월이었다. 결과: 13예에서 승모판치환술을 시행하였는데 9예에서 기계판막을 사용하였고 4예에서 조직판막을 사용하였다. 10예에서 다양한 수기의 승모판성형술을 시행하였다. 동반수기로는 6예에서 대동맥판 치환술, 2예에서 삼첨판 성형술, 1예에서 변형된 미로수술, 1예에서 심실중격결손 낙합술을 시행하였다. 술 후 합병증으로는 출혈에 의한 재수술 2예, 종격동염 1예, 저심박출증 1예, 페렴 1예가 있었다. 술 후 30일 이내의 조기사망이나 병원 내 사망 및 판막 연관성 합병증은 없었다. 1예의 환자가 수술 3개월 후 다시 판막성형술을 받았고, 술 전 우종 전색에 의한 뇌경색을 보인 1예의 환자가 술 후 31개월에 뇌출혈로 사망하여 만기 전 체판막 연관성 사망률은 4.3%, 판막연관성 합병증은 8.6%였다. 1, 3, 5년 valve-related event free rate는 90.8%, 79.5%, 79.5%이었고 1, 3, 5년 생존율은 100%, 88.8%, 88.8% 이었다. 결론: 승모판 심내막염의 외과적 치료 시에는 감염된 조직의 완전 절제가 중요하며, 감염된 조직을 완전히 제거하면 대체물이나 수술 기법상의 차이가 결과에 미치는 영향은 크지 않을 것으로 판단되고, 술 전에 감염이나 우종 전색에 의한 뇌손상이 의심되는 환자에서는 술 후 추적관찰 중에도 뇌혈관 손상 가능성에 대해 주의 깊게 관찰하여야 할 것으로 생각된다.

TVA 메타데이터 전송과정에서 단편화에 의한 성능 감소를 회피하기 위한 효율적인 캡슐화 방식

오봉진(Bong-Jin Oh),박종열(Jong-youl Park),김상형(Sang-Hyung Kim),유관종(Kwan-Jong Yoo) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.7