http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
하악골 절제술후 재이식된 돌결자가골 재이식 : 치험 3례
김 식,김수관,김운규,김수민,류종희,이준길,조경안,김수흥,정태영,여환호 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.2
We described three cases of immediate reimplantation of a frozen-thawed autogenous mandible composed of a mixture of iliac bone, marrow, and particulate hydroxyapatite in tumors of the mandible. Acceptable outcomes were obtained in three patients who underwent immediate autogenous mandibular graft reconstruction. The conditions leading to successful outcome of the procedure are also discussed. Reimplantation of frozen autogenous lesioned mandible was performed in three patients with mandibular tumors. Two reimplanted grafts survived without complications following surgery. One case had postoperative infection that resolved with appropriate antibiotic treatment. There were no recurrences of the primary lesions. Satisfactory facial contour after surgery was achieved. These results are most promising, and we believe that, with further refinement, this technique will offer a new and acceptable modality for facial reconstruction in patients with cancer.
Reliability-Based Optimum Tolerance Design for Industrial Electromagnetic Devices
Su-Gil Cho,Junyong Jang,Su-Jin Lee,Kyu-Seob Kim,Jung-Pyo Hong,Woo-Kyo Jang,Tae Hee Lee IEEE 2014 IEEE transactions on magnetics Vol.50 No.2
<P>Principle of tolerance design is receiving increased research focus to determine the optimal tradeoff between manufacturing cost and quality. However, current tolerance designs are not suitable for products such as electromagnetic devices that require high reliability, i.e., a very low failure rate. In this paper, a new tolerance design named as reliability-based optimum tolerance design is formulated and performed to guarantee the high reliability of the products while maximizing manufacturing tolerances. The proposed method quantifies the reliability using reliability analysis, which reflects the tolerance in the tolerance design. To validate the proposed method, tolerance design is applied to two examples: 1) a magnetic circuit ( C -core) and 2) a mass-produced interior permanent magnet motor that contains manufacturing tolerances of permanent magnet.</P>
Electrical Performances of InN/GaN Tunneling Field-Effect Transistor
Cho, Min Su,Kwon, Ra Hee,Seo, Jae Hwa,Yoon, Young Jun,Jang, Young In,Won, Chul-Ho,Kim, Jeong-Gil,Lee, Junsoo,Cho, Seongjae,Lee, Jung-Hee American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11
<P>In this paper, we design and analyze the InN/GaN double-gate (DG) tunneling field-effect transistor (TFET) with very steep switching and superb DC and RF characteristics. The proposed device is closely investigated in terms of both DC and RF performances including I-on, I-off, on/off current ratio (I-on/I-off), subthreshold swing (S), cut-off frequency (f(t)), maximum oscillating frequency (f(max)), and Johnson's figure of merit (JFOM) using TCAD simulation. The proposed InN/GaN TFET shows high current drivability, extremely suppressed I-off, and higly sharp switching owing to the effects by the electron well formed by the control gate (CG) in the InN layer. The InN/GaN TFET having a channel length (L-ch) of 50 nm demonstrated maximum I-on = 3.5 mA/mu m, extremely low I-off = 1 x 10(-21) A/mu m, minimum S of 8.8 mV/dec, and the maximum values of f(t) and f(max) are obtained as 100 GHz and 5.5 THz, respectively. In order to confirm the high performances of the devices in the RF operation, JFOM has been calculated and the value extracted from an optimally designed InN/GaN TFET is 1.7 THz.V.</P>
비정규 분포의 잡음인자를 고려한 곱분해기법 기반의 통계 모멘트를 이용한 효율적인 강건 최적설계
조수길(Su-gil Cho),이민욱(Minuk Lee),임우철(Woochul Lim),최종수(Jong-Su Choi),김형우(Hyung Woo Kim),홍섭(Sup Hong),이태희(Tae Hee Lee) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.11
제품의 성능은 시스템에 작용하는 환경인자, 재료 물성치와 같은 잡음인자의 변동에 큰 영향을 받는다. 제품의 성능을 위해서, 이러한 잡음인자의 변동에 따른 영향을 줄이는 것이 필요한데 이를 강건설계라 한다. 하지만 기존의 강건설계는 잡음인자의 변동이 아닌 설계변수의 변동을 중요하게 생각했다. 또한 변수와 인자의 분포를 정규분포로 가정해야 하는데 이는 실제 잡음인자의 분포와 맞지 않는 경우가 많다. 본 논문에서는 비 정규분포의 잡음인자의 분포를 고려하는 강건최적설계 기법을 제안한다. 제안된 기법은 실험을 통해 추정된 잡음인자의 비 정규분포 변동을 고려할 수 있다. 제안된 기법의 유용성을 확인하기 위해 공학예제로 심해저 망간 채집장치의 강건설계를 수행하였다. The performance of a system can be affected by the variance of noise factors, which arise owing to uncertainties of the material properties and environmental factors acting on the system. For robust design optimization of the system performance, it is necessary to minimize the effect of the variance of the noise factors that are impossible to control. However, present robust design techniques consider the variation of design factors, and not the noise factors, as being important. Furthermore, it is necessary to assume a normal distribution; however, a normal distribution is often not suitable to estimate the variations. In this study, a robust design technique is proposed to consider the variation of noise factors that are estimated as non-normal distributions in a real experiment. As an example of an engineering problem, a deep-sea manganese nodule miner tracked vehicle is used to demonstrate the feasibility of the proposed method.
심해저 환경인자를 고려한 시험집광기 주행장치의 곱분해 기법 기반의 통계 모멘트를 이용한 효율적인 강건 최적설계
조수길(Su-gil Cho),이민욱(Minuk Lee),임우철(Woochul Lim),최종수(Jong-Su Choi),김형우(Hyung Woo Kim),홍섭(Sup Hong),이태희(Tae Hee Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A deep-sea manganese nodule miner consists of 4 parts: pickup device, crusher, disposal device and tracked vehicle. The tracked vehicle is an essential component in the self-propelled mining system moving on soft soil. Performances of the tracked vehicle are influenced by noise factors; track speed, seafloor slope, shear stress, bottom currents and reaction forces of flexible hose. It is necessary to adopt robust design method that improves performances as well as minimize the variation of performances due to noise factors. Robust design optimization using statistical moments based on multiplicative decomposition method, calculate statistical moments using explicit integral of kriging metamodel and probability density functions of noise factors, can accurately and efficiently search for the robust optimum. In this paper, we adopt robust design optimization using statistical moments based on multiplicative decomposition method for test miner tracked vehicle on collecting operation.
조수길(Su-gil Cho),이민욱(Minuk Lee),이태희(Tae Hee Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
제품 생산 시 발생하는 제작 공차, 항복강도와 탄성계수와 같은 재료 물성치의 불확실성, 온도나 습도와 같이 시스템에 작용하는 환경인자 등은 시스템의 성능에 영향을 미친다. 강건 최적설계는 이러한 인자들이 시스템에 미치는 영향을 최소화하면서 성능을 개선하는 설계기법으로 최근 많은 연구가 이루어지고 있다. 하지만 때로는 설계에서 여러 인자들의 분포를 고려해야 하기 때문에 막대한 시간과 계산비용이 드는 문제가 있다. 본 논문에서는 이러한 문제점을 개선하기 위하여 곱분해 기법을 이용한 강건 최적설계를 제안한다. 제안된 기법은 설계영역을 크리깅 메타모델로 근사하고 이를 곱분해 기법에 적용함으로써 효율적이고 정확한 강건 최적설계를 수행할 수 있다. 수학 예제와 공학 예제를 통해 제안된 기법의 정확성과 효율성을 보인다. Performance of the system can be affected by variables which are tolerance of manufacture, uncertainty of the material property and environmental factor acting on the system. Robust design optimization has gained much attention in design of products because it can find the best design solution minimizing the variance of response as well as consider distribution of the variables. However, computational burden and accuracy of optimization has been still a challenging problem. In this paper, robust design optimization using multiplicative decomposition method is proposed in order to resolve the difficulties. Because the proposed method calculates mean and variance directly from the kriging metamodel using multiplicative decomposition method, it can search for a robust optimum design accurately as well as efficiently. Several mathematical and engineering examples are used to demonstrate the proposed method.
심해 잡음인자를 고려한 망간단괴 시험집광기의 채집운용시 주행장치 다구치 강건설계
조수길(Su-gil Cho),이민욱(Minuk Lee),임우철(Woochul Lim),최종수(Jong-Su Choi),김형우(Hyung-Woo Kim),이창호(Chang-Ho Lee),홍섭(Sup Hong),이태희(Tae Hee Lee) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.1
A deep-sea manganese nodule miner consists of 4 parts: the pickup device, crusher, disposal device, and tracked vehicle. The tracked vehicle is an essential component to keep the self-propelled miner moving across deep-sea soil. The performances of the tracked vehicle are influenced by noise factors: the shear strength of the seafloor, bottom current, seafloor slope, track speed, reaction forces of flexible hose, etc. It is necessary to adopt a robust design method that improves the performances and minimizes the variation caused by noise factors. Taguchi’s method, the most widely known robust design method, searches for the robust optimum using an orthogonal array composed of the product of the inner array and outer array. In this paper, we propose a new screening technique to reduce the number of input factors and apply the MRSN (Multi-Response Signal to Noise) ratio to convert multiple performances into single one in order to overcome the difficulties and limitations of using Taguchi’s method in a case with many input factors and multiple performances. A test miner was already designed and tested. It has about 1/10 the capacity of a commercial one and was successfully operated at an in-shore area. Taguchi’s robust design was applied to the tracked vehicle of the test miner, and design improvements were implemented for the vehicle.