수험생으로서의 신념

김상형 단국대학교 법학연구소 1959 법학논총 Vol.2 No.1

심장 다판 치환술의 임상성적

김상형,김주홍,나국주,Kim, Sang-Hyeong,Kim, Ju-Hong,Na, Guk-Ju 대한흉부심장혈관외과학회 1994 Journal of Chest Surgery (J Chest Surg) Vol.27 No.10

From April, 1982 to December, 1992, multiple valve replacement was performed in 100 patients. Mitral and aortic valve replacement were done in 86 patients, 9 underwent mitral and tricuspid valve replacement, 4 patients underwent triple valve replacement and 1 patient underwent aortic and tricuspid valve replacement. Of the valve implanted, 100 were St. Jude, 64 Duromedics, 19 Carpentier-Edwards, 13 Bj rk-Shiley, 6 Ionescu-Shiley, and 2 Medronics.The hospital mortality rate was 15%[15 patients] and the late mortality rate was 7%[7 patients], the mortality rate was high in early operative period but decreased with time[20% at 1986, 18.2% at 1987, 9.5% at 1988, 11.1% at 1989, 12.5% at 1990, 11.8% at 1991, 0% at 1992]. The causes of death were low cardiac output in 8, sudden death in 3, CHF in 3, bleeding in 2, cerebral thromboembolism in 1, leukemia in 1, multiorgan failure in 1 and so on. The actuarial survival rate excluding operative death was 73% at 10 years.

승모판 치환술의 임상적 고찰

김상형,정정기,Kim, Sang-Hyeong,Jeong, Jeong-Gi 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery (J Chest Surg) Vol.24 No.9

From August, 1986 to December, 1989, mitral valve replacement was performed in 93 patients. Of the valve implanted, 42 were Duromedics, 35 St. Jude Medical, 15 Carpenter-Edwards and 1 Ionescu-Shiley. The hospital mortality rate was 3.2%[3 patients] and the late mortality rate was 4.3% [4 patients]. The causes of hospital death were LV rupture in 1, renal failure in 1 and hypoxic brain damage in l. The causes of late death were congestive heart failure in 1 and sudden death in 3. Follow-up was done on 78 surviving patients; mean follow-up period was 29.22$\pm$9.09 months. The actual survival rate was 91.8% at 4 years. We concluded, therefore, that good clinical results could be achieved with mitral valve replacement in short-term follow-up, and long-term follow-up is also necessary.

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.

Static balancer of a 4-DOF manipulator with multi-DOF gravity compensators

김상형,조창현 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10

This paper proposes a Gravity compensator (GC) for a humanlike four Degrees-of-freedom (4-DOF) manipulator in that three 2-DOF and two 3-DOF unit GCs are used. The equivalent mapping analyses show that various types of multi-DOF GCs can be classified into their own type of DOF regardless of the order of successive rotations and selection of reference frames. Therefore, the selection of multiDOF GCs has become simple. A method for the placement of unit GCs is proposed. For the 4-DOF manipulator sixteen combinations of unit GCs are obtained and various designs (mapping matrices) can be further developed for an each combination considering locations of unit GCs. The 5-GC combination is chosen among various designs. The placement of the unit GCs is conducted for the 5-GC combination, and its performance is evaluated with a numerical simulation. The case study showed that most of the unit GCs are applicable to the 4-DOF manipulator and the same placement of unit GCs is achieved for all applicable unit GCs.

Synthesis method of a mapping matrix for gravity compensators

김상형,최문택,조창현 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.12

This paper presents a synthesis method of a mapping matrix for gravity compensators. For the space mapping method the mapping matrix indicates the number of unit gravity compensators and their locations simultaneously. To enable the synthesis of the mapping matrix we newly suggest the motion matrix, which is originated from the concept of mobility and connectivity and represents possible joint motions of a target mechanism. We showed that a motion matrix can be synthesized by merging several motion matrices. The motion matrix is modified considering features of static balancing (e.g., absolute motion, mobility and potential energy) and, therefore, the mapping matrix is derived from the motion matrix with no computations. Thus, the synthesis of a gravity compensator is enabled with the motion matrix. The syntheses are conducted for a six-DOF and three-link manipulator.

신뢰성있는 MPEG 시스템에서의 QoS를 고려한 전송 알고리즘

김상형,이성인,유원경,유관종 한국콘텐츠학회 2007 한국콘텐츠학회논문지 Vol.7 No.2

Currently, multimedia stream services are provided in various network environments such as wireless networks. It is crucial to address QoS problem for multimedia service in heterogeneous networks. This paper suggests the scheme to increase the efficiency for the transmission of multimedia data. We also propose the adaptive algorithm that switch between UDP and TCP based on the size of the transmitted multimedia data. In addition, it presents the method that duplicates the multimedia data for the efficiency of transmission. We designed the MPEG stream service and conducted the simulation to verify our adaptive MPEG stream service. 현대의 멀티미디어 서비스는 무선 환경 같은 여러 형태의 단말에게 동시에 서비스를 제공하고 있다. 그러나 이러한 서비스를 제공하기 위해서는 각 환경에 맡는 QoS를 제공하는 것이 먼저 선행 되어야 한다. 본 연구는 데이터의 전송에 대한 효율성을 높이기 위한 방법을 제안한다. 전송 방법을 TCP와 UDP로 구분하여 전송량에 따라 적응적인 전송 알고리즘을 기술한다. 또한, 계층화된 데이터의 중복 전송을 통하여 데이터의 전송 효율을 높이는 방법에 대해서 설명한다. 제안 되어진 멀티미디어 시스템의 성능을 입증하기 위하여 적응형 MPEG 시스템을 설계하고, 실험을 통해서 우수성을 증명한다.

흉벽종양의 임상적 고찰

김상형 대한흉부심장혈관외과학회 1977 Journal of Chest Surgery (J Chest Surg) Vol.10 No.2

The author reviewed 10 patients of chest wall tumors which were operated during 7 years, from 1970 to 1976, in Department of Thoracic and Cardiovascular Surgery in Chonnam University Hospital. Benign tumors were 6 patients, malignant tumors were 2 patients and metastatic tumors were 2 patients. Benign tumors were more than malignant tumors, but total cases were small, so, statistical analysis was not enough. Specific symptoms of chest wall tumor were swelling due to mass and pain. All cases had swelling due to mass and 4 cases [40%] had pain. Dyspnea was noted in metastatic tumors. The review of the literatures was also done.

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.

심장 다판치환술의 임상적 고찰

김상형,나국주,Kim, Sang-Hyeong,Na, Guk-Ju 대한흉부심장혈관외과학회 1989 The Korean Journal of Thoracic and Cardiovascular Vol.22 No.6

From April 1982 to December, 1988, multiple valve replacement was performed in 49 patients. Mitral and aortic valve replacement were done in 42 patients, 4 underwent mitral and tricuspid valve replacement and 3 patients underwent triple valve replacement. Of the valve implanted, 50 were Duromedics, 21 St. Jude, 13 Bjork-Shiley, 9 Carpentier-Edwards, 6 Ionescu-Shiley, and 2 Medtronic. The hospital mortality rate was 28.5 % [14 patients] and the late mortality rate was 6.1 % [3 patients], the mortality rate was high in early operative period but decreased with time. [20% at 1986, 18.2 % at 1987, 9.5% at 1988] The causes of death were low cardiac output in 8, congestive heart failure in 2, multiple organ failure in 1, LV rupture in 1, intracerebral hemorrhage in 1 and sudden death in l. The actuarial survival rate excluding operative death was 77% at 7 years.