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- 저자 : 김성기(Kim, Seong ki) (검색결과 636 건)
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광배근 유리 피판술을 이용한 두피 및 두개골 결손의 재건
김성기,노시균,이내호,양경무,Kim, Seong-Ki,Roh, Si-Gyun,Lee, Nae-Ho,Yang, Kyung-Moo 대한미세수술학회 2013 Archives of reconstructive microsurgery Vol.22 No.1
Purpose: Reconstruction of scalp and calvarial defects should provide both aesthetic and functional aspects. The inelastic nature of the scalp and previous surgery or radiation preclude the use of primary closure or a local flap. With development of microsurgical technique, a free tissue transfer is a good option. We use the latissimus dorsi myocutaneous free flap for reconstruction. Materials and Methods: A review of all latissimus dorsi free flap reconstructions performed in nine patients from 2009 to 2012 was conducted. There were six males and three females, ranging in age from seven to 69 years, and nine different regions, including five temporal regions, two occipital regions, and two frontoparietal regions. The flaps ranged in size from $9.0{\times}10.0cm$ to $14.0{\times}15.0cm$. Recipient vessels available for microanastomosis were most often the superficial temporal vessels and two patients had anastomoses to the external carotid artery and internal jugular vein. Results: All flaps survived postoperatively. With a median follow-up period of 14 months, no major complications were noted. However, two patients developed minor wound dehiscence, and a hematoma was observed in one patient. Conclusion: We performed the latissimus dorsi myocutaneous free flap reconstruction, which is one of the most popular reconstructive methods. The latissimus dorsi myocutaneous free flap reconstruction has been proven successful in our patients with satisfactory results. During the long term follow-up period, even though depressions were observed on the defect area in some patients, they were treated successfully with cranioplasty. Therefore, we recommend the latissimus dorsi myocutaneous free flap for reconstruction of scalp and calvarial defects.
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김성기,노시균,이내호,양경무,Kim, Seong-Ki,Roh, Si-Gyun,Lee, Nae-Ho,Yang, Kyung-Moo 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.3
Purpose: High-pressure injection injury is caused by accidental injection of the high-pressure injection devices in industry. The initial benign appearance of the wound fools patients into delays in an adequate treatment. And it can result in disastrous outcomes such as necrosis and amputation. To avoid the poor prognosis, the injuries require a prompt surgical intervention. The purpose of this article is to recognize the poor outcome of the highpressure injection injury and to introduce an adequate treatment in need. Methods: We have 4 cases of the high-pressure injection injuries in the hand from April, 2005 to March, 2009. Average age is 39 years (30 - 49 years old), 2 cases are the palm of dominant hand, 1 case is the thumb of dominant hand, and 1 case is the palm of non-dominant hand, respectively. We followed up these patients for 20 months on average. In 3 cases, the immediate, aggressive surgical intervention was carried out, but the other one was delayed in early adequate treatment. The wounds were covered by local advancement flap, anterolateral thigh free flap, conservative treatment with antibiotics and dressing. Results: No pathogens after culture were found nor any findings of fracture in imaging study. Conservative treatment, local advancement flap and anterolateral thigh free flap for the open wound resulted in a desirable aesthetic outcome. In a long-term follow up, functional capability of the patient was also satisfactory. Conclusion: Upon initial evaluation, most high-pressure injection injuries present as innocuous wounds with very few symptoms and result in delaying the proper management. And the majority of high-pressure injection injuries will produce significant morbidity to the hand, amputation. And the initial aggressive surgical debridement was needed to prevent the poor outcome. The key to success in treating high-pressure injection injuries of the hand is the prompt aggressive surgical intervention.
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김성기,Kim, Seong-Gi 한국대학교육협의회 1997 大學敎育 Vol.89 No.-
우리나라에서 대학입학은 직접적인 관련 집단의 민감한 사안일 뿐만 아니라, 모든 국민의 공통적인 관심사이다. 그런 만큼 대학입학 전형제도는 대학입학 전형의 의미에 비추어 도출되는 규범적 원칙들에 기초하여 신중하게 수립되어야 한다. 전형요소 설정의 타당성, 전형유형 설정의 공정성, 전형과정의 자율성 등의 준거에 비추어 새 대학입학 전형제도의 정책논리를 비판적으로 고찰하고 발전방향을 제시하고자 한다.
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김성기,송홍복,조경연,Kim, Sung-Gi,Song, Hong-Bok,Cho, Gyeong-Yeon 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.1
부동소수점 제곱근 계산에 많이 사용하는 골드스미트 제곱근 알고리즘은 곱셈을 반복하여 제곱근을 계산한다. 본 논문에서는 골드스미트 제곱근 알고리즘의 반복 과정의 오차를 예측하여 오차가 정해진 값보다 작아지는 시점까지 반복 연산하는 알고리즘을 제안한다. 'F'의 제곱근 계산은 초기값 $X_0=Y_0=T^2{\times}F,\;T=\frac{1}{\sqrt {F}}+e_t$에 대하여, $R_i=\frac{3-e_r-X_i}{2},\;X_{i+1}=X_i{\times}R^2_i,\;Y_{i+1}=Y_i{\times}R_i,\;i{\in}\{{0,1,2,{\ldots},n-1} }}'$을 반복한다 곱셈 결과는 소수점 이하 p 비트 미만을 절삭하며, 절삭 오차는 $e_r=2^{-p}$보다 작다. p는 단정도실수에서 28, 배정도실수에서 58이다. $X_i=1{\pm}e_i$ 이면 $X_{i+1}$ = $1-e_{i+1}$ $e_{i+1} {\frac{3e^2_i}{4}{\mp}\frac{e^3_i}} $ +4$e_{r}$이다. $|X_i-1|$ < $2^{\frac{-p+2}{2}}$이면, $e_{i+1}$ < $8e_{r}$ 이 부동소수점으로 표현할 수 있는 최소값보다 작게 되며, $\sqrt{F}$ {\fallingdotseq}\frac{Y_{i+1}}{T}}$이다. 본 논문에서 제안한 알고리즘은 입력 값에 따라서 곱셈 횟수가 다르므로, 평균 곱셈 횟수를 계산하는 방식을 도출하고, 여러 크기의 근사 역수 제곱근 테이블 ($T=\frac{1}{\sqrt{F}}+e_i$)에서 단정도실수 및 배정도실수의 제곱근 계산에 필요한 평균 곱셈 횟수를 계산한다. 이들 평균 곱셈 횟수를 종래 알고리즘과 비교하여 본 논문에서 제안한 알고리즘의 우수성을 증명한다. 본 논문에서 제안한 알고리즘은 오차가 일정한 값보다 작아질 때까지만 반복하므로 제곱근 계산기의 성능을 높일 수 있다. 또한 최적의 근사 역수 제곱근 테이블을 구성할 수 있다. 본 논문의 연구 결과는 디지털 신호처리, 컴퓨터 그래픽스, 멀티미디어, 과학 기술 연산 등 부동소수점 계산기가 사용되는 분야에서 폭 넓게 사용될 수 있다. The Goldschmidt iterative algorithm for finding a floating point square root calculated it by performing a fixed number of multiplications. In this paper, a variable latency Goldschmidt's square root algorithm is proposed, that performs multiplications a variable number of times until the error becomes smaller than a given value. To find the square root of a floating point number F, the algorithm repeats the following operations: $R_i=\frac{3-e_r-X_i}{2},\;X_{i+1}=X_i{\times}R^2_i,\;Y_{i+1}=Y_i{\times}R_i,\;i{\in}\{{0,1,2,{\ldots},n-1} }}'$with the initial value is $'\;X_0=Y_0=T^2{\times}F,\;T=\frac{1}{\sqrt {F}}+e_t\;'$. The bits to the right of p fractional bits in intermediate multiplication results are truncated, and this truncation error is less than $'e_r=2^{-p}'$. The value of p is 28 for the single precision floating point, and 58 for the doubel precision floating point. Let $'X_i=1{\pm}e_i'$, there is $'\;X_{i+1}=1-e_{i+1},\;where\;'\;e_{i+1}<\frac{3e^2_i}{4}{\mp}\frac{e^3_i}{4}+4e_{r}'$. If '|X_i-1|<2^{\frac{-p+2}{2}}\;'$ is true, $'\;e_{i+1}<8e_r\;'$ is less than the smallest number which is representable by floating point number. So, $\sqrt{F}$ is approximate to $'\;\frac{Y_{i+1}}{T}\;'$. Since the number of multiplications performed by the proposed algorithm is dependent on the input values, the average number of multiplications per an operation is derived from many reciprocal square root tables ($T=\frac{1}{\sqrt{F}}+e_i$) with varying sizes. The superiority of this algorithm is proved by comparing this average number with the fixed number of multiplications of the conventional algorithm. Since the proposed algorithm only performs the multiplications until the error gets smaller than a given value, it can be used to improve the performance of a square root unit. Also, it can be used to construct optimized approximate reciprocal square root tables. The results of this paper can be applied to many areas that utilize floating point numbers, such as digital signal processing, computer graphics, multimedia, scientific computing, etc.
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고정화(固定化) Glucose Oxidase의 반복(反復) 사용성(使用性) 연구(硏究)
김성기,Kim, Sung-Kih 생화학분자생물학회 1981 한국생화학회지 Vol.14 No.4
혈당(血糖)을 비롯한 탄수화물의 분해물 중의 글루코우즈를 측정하는데 사용되는 glucose oxidase를 고정화(固定化)시켜 반복해서 사용할 수 있는 조건을 검토하였다. GOD를 고정화 시킬 때의 가용성 GOD의 단위가 1~2일 때 그 잔여활성은 80 % 정도였고 가용성 GOD의 단위의 증가에 비례하여 잔존활성은 증가되지 않았다. 고정화 GOD의 bead의 크기가 0.3 mm로 작을 때 그 잔존활성은 85.5 %로 높았고 bead가 커질수록 그 잔존활성은 점점 저하되었다. GOD의 pH에 대한 안정성은 가용성 GOD를 pH 5.5에 10시간 처리했을 때, 60 %의 잔존활성을 보였고 고정화 GOD는 5.5~6.5에서 약 80 %정도 높은 활성을 보였다. GOD의 열에 대한 안정성은 가용성 GOD는 $35{\sim}50^{\circ}C$에서 10시간 처리해도 안정하였고 고정화 GOD는 $60^{\circ}C$에서도 안정하였으나 그 이상의 온도에서는 모두 활성이 급격히 상실되었다. 고정화 GOD를 매일 일회씩 30회 계속하여 반복 사용하여도 활성에 변화가 없었다. 고정화 GOD를 실온에서 건조하여 보관할 경우 활성이 저하되었으나 phosphate 완충액 또는 냉동건조시킨 후 $-5^{\circ}C$에 보관할 경우 큰 변화가 없었다. 고정화 GOD를 이용하여 글루코우즈는 일정하게 측정되었다. Glucose oxidase (GOD) was immobilized by polyacrylamide entrapment to use respeatedly for the determination of glucose in blood and hydrolyzates of polysaccharides. The retained activity of immobilized GOD was about 80 % when 1~2 unit of the native GOD was applied for immobilization, but the GOD activity was not retained in proportion to increment of GOD unit. The immobilized GOD had 85.5% of the ratained activity for 0.3 mm of bead diameter. The enzyme activity, however, decreased as size of of bead increased. In pH stability of the enzyme, the residual activity of the native GOD was 60% when the enzyme was pretreated at pH 5.5 for 10 hr, while the residual activity of immobilized one was about 80% when at pH 5.5~6.5. The GOD had higher thermal stability when the native enzyme was preincubated at $35{\sim}50{\circ}C$ for 10 hr and immobilized one at $35{\sim}60{\circ}C$. There was no significant decrease of the immobilized enzyme activity by using repeatedly in batch reactor one time per day for 30 times. The retained activity of immobilized GOD decrease remarkably when the product was stored at room temperature for 4 months in dry state. Lyophilized enzyme and the enzyme in phosphate buffer solution at $-5{\cirs}C$ showed a tendency to decrease depending on the storage period. The linear curve was obtained by determination of various concentrations of D-glucose by the immobilized GOD.
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