원위 대퇴골의 고립성 골연골종에서 발생한 속발성 연골 육종 1례 보고

정필현,황장수,강석,김용민,오형호,채동주,김종필 동국대학교 경주대학 1996 東國論集 Vol.15 No.-

연골육종은 비교적 서서히 자라며 늦게 전이하는 악성 연골 종양으로 알려져 있다. 골 연골종에서 발생한 속발성 연골육종은 발생빈도는 드물며 타부위로의 전이가 적고 악성도가 낮은 경우가 많아 적합한 수술적 치료로서 좋은 예후를 보이는 것으로 보고되고 있다. 본 동국대학교 정형외과학 교실에서는 우측 대퇴골 원위부 골간단부에 생긴 고립성 골 연골종에서 이차적으로 발생한 연골육종을 치험한 바 문헌고찰과 함께 보고하는 바이다. A case of Secondary Chondrosarcoma Arising from Solitary Osteochondroma of the Distal Femur Department of Orthopaedic Surgery, College of Medicine, DongGuk University Phil Hyun Chung M.D., Jung Su Hwang M.D., Suk Kang M.D., Yang Mln Kim M.D., Hyung Ho Oh M.D., Dong Ju Chae M.D., Jong Pil Kim M.D. Chondrpsarcoma is a malignant cartilage-forming tumor that grows slowly and metastasis of this tumor occurs in late stage. Secondary chondrosarcomas arising from a solitary osteocartilaginous exostosis are rare and those have a better prognosis than other chondrosarcomas, and they rarely metastasize. We present our experience with a case of secondary chondrpsarcoma arising in solitary osteochondroma of distal metaphysis of right femur with clinical details.

탄수화물에서 광학활성 중간체 O-보호된 (S)-와 (R)-3-히드록시 알데히드의 합성

강석구,조현성,심형수 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.1

탄수화물로부터 유도된 불포화 퓨라노스 고리계를 입체 선택적인 수소화 반응에 의해 chiral synthon인 광학활성의 (S)-3-포르밀옥시 알데히드를 합성하였고, 탄수화물에서 유도된 3-히드록시 퓨라노스를 Barton-McCombie의 deoxygenation반응에 의해 (R)-3-포르밀옥시 알데히드를 합성하였다. (S)-e-Formyloxyaldehydes, chiral synthons for natural products, were synthesized via highly stereoselective hydrogenation of the unsaturated furanose ring system derived from D-glucose or D-xylose. Alternatively, (R)-3-formyloxyaldehydes were prepared via deoxygenation of 3-hydroxyfuranoses.

내부유체를 가진 Pin Fin의 최적화 (고정된 핀 체적 기준)

강형석 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.B

A cylindrical pin fin with inside fluid is optimized based on fixed fin volume by using the one dimensional analytic method. Heat loss from the fin and the pin fin radius for fixed fin volume is presented as a function of the fin length. Temperature variation of the fin with the variation of ambient and inside fluid convection characteristic numbers and fin base thickness is listed. The maximum heat loss at the practical fin length and corresponding optimum fin length and radius are presented as a function of fin base thickness, inside convection characteristic number, fin volume and ambient convection characteristic number. One of the results shows that the optimum pin fin shape becomes relatively fatter as the fin volume increases.

대류, 복사 사각 핀의 해석

강형석,김종욱 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

A convective, radiating rectangular fin is analysed bv using the one dimensional analytic method, Instead of constant fin base temperature, heat conduction from the inner wall to the fin base is considered as the fin base boundary condition. Radiation heat transfer is approximately linenrized. For different fin tip length. temperature profile along the nurmalized fin position is shown. The fin tip length for 98% of the maximum heat loss with tlie variations of fin base leiigth and radiation characteristic number is listed. The maximum heat loss is presented as a function of the fin base length, radiation characteristic number and Biot number.

여러 형상의 대칭적인 핀의 성능 해석

강형석 江原大學校 産業技術硏究所 1996 産業技術硏究 Vol.16 No.-

A comparison of the fin effectiveness, thermal resistance, and fin efficiency between the symmetric triangular fin and the symmetric trapezoidal fin which has various slopes of the fin side is made. Also the relation between Biot number and the non-dimensional fin length for equal amount of heat loss from these fins is shown. For these analyses, a forced analytic method is used. In particular, the equation for the heat loss is used simultaneously for both the symmetric triangular fin and the symmetric trapezoidal fins by just adjusting the value of the slope factor. The value of Biot number varies from 0.01 to 1.0 and the non-dimensional fin length varies from 0.01 to 10. For simplicity, the root temperature and fin's surrounding convection coefficient are assumed constant and the condition is assumed to be steady state.

사다리꼴 fin: 사각 fin과의 열손실 비교와 열손실에 미치는 경사요소의 효과

강형석,윤세창 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.A

Heat loss from the trapezoidal fins haying different upper side slope and that from a rectangular fin are investigated by the three dimensional analytic method. It is shown that the trapezoidal fins having different upper side slope become an approximate rectangular fin by inst adjusting the slope factor. The comparison of the heat loss between a rectangular fin and an approximate rectangular fin is represented as a function of the non-dimensional fin length, fin width and Biot number to make sure that the analysis on the trapezoidal fins having different upper side slope is countable. One of the results is that the relative value of heat loss between a rectangular fin and an approximate rectangular fin is less than 1.5% for given ranges of non-dimensional length and width in case of Bi = 0.1.

직경이 변하는 원통형 Pin 핀의 해석

강형석,김종욱 江原大學校 産業技術硏究所 2007 産業技術硏究 Vol.27 No.B

A cylindrical pin fin with variable diameter is analyzed by using the one dimensional analytical method. Heat loss and fin efficiency are presented as a function of the fin diameter, length and convection charactehstic numbers ratio. The relationship between the fin diameter and convection characteristic number over the fin for the same amount of heat loss is shown. One of the results indicates the fin efficiency increases as the fin diameter increases while that decreases as the fin length increases.

탄수화물에서 syn-과 anti-2, 3-디히드록시 알데히드의 합성 : L-Factor와 Muricatacin의 합성

강석구,조현성,심형수 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.1

천연물합성에 있어서 합성중간체로서 유용한 광학활성의 O-보호된 syn-과 anti-2, 3-디히드록시 알데히드의 네 가지 입체이성질체들을 쉽게 구할 수 있는 D-글루코스나 D-크실로스에서 유도된 푸라노스를 변형시켜 합성하였다. 예컨대 불포화 퓨라노스계의 이중결합에 수소화붕소 첨가반응-산화반응에 의해 입체선택적으로 히드록시퓨라노스를 얻고 이를 O-베질화후 탈아세톤화, 산화성절단반응에 의해 (2S, 3S)-3-포르옥시-2-벤질옥시알칸알을 얻었으며 그 외 (2S, 3R)-, (2R, 3S)-, (2R, 3R)-디히드록시알칸알을 얻었다. 이러한 중간체들을 이용하여 L-factor와 muricatacin을 합성하였다. Four stereosiomers of optically active O-protected syn- and anti-2, 3-dihydroxy aldehydes, chiral synthons for natutal product synthesis, were synthesized from readily avilable D-glucose and E-Xylose. (2S, 3S)-3-Formylosy-2-benzylxoy alkanals were synthesized by stereoselective hydroboration of the unsaturated furanoses followed by O-benzylation, deprotection, and oxidative cleavage. (2S, 3R)-, (2R, 3S)-, and (2R, 3R)-Dihydroxy alkanals were also synthesized. Using these chiral synthons, (4R, 5S)-(-)- and (4S, 5S)-(+)-L-factors, the proposed autoregulators from Strpiomyces griseus and muricatacin, a biologically active constituent from the seeds of Annona muricata L. were synthesized.

열적 비대칭 삼각 핀의 열전달 해석 : 핀 끝 효과에 기준 Based on Fin Tip Effect

강형석 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.B

The non-dimensional heat loss from a thermally asymmetric triangular fin is investigated as a function of a ratio of upper and lower surface Biot numbers (Bi2/Bi1), the non-dimensional fin length and tip surface Biot number using the two-dimensional separation of variables method. The effect of fin tip surface Biot number on the variation of the non-dimensional temperature along the sloped upper and lower surfaces for the thermally asymmetric condition is presented. The relationship between the non-dimensional fin length and the fin tip surface Biot number for equal amount of heat loss is also discussed as well as the relationship between upper surface Biot number and tip surface Biot number for equal amount of heat loss.

삼각핀에 대한 핀끝의 영향

강형석 江原大學校 産業技術硏究所 1993 産業技術硏究 Vol.13 No.-

Two dimensional analysis on the triangular fin for both the insulated fin tip and non-insulated fin tip and one dimensional analysis on that when the temperature of the fin tip is finite are made. The effect of the fin tip is shown by comparing the heat loss from the fin and the temperature along the fin length varing the non-dimensional fin length and Biot number for each three cases. The results are following . When the non-dimensional fin length is very short, the relative error of the heat loss from the fin with insulated fin tip to that from the fin with non-insulate fin tip is very high. The value of the temperature variation along the non-dimensional fin length is minimum for the finite fin tip temperature using one dimensional analysis and is maximum for the insulated fin tip using two dimensional anaysis.