시험평가 실험계획을 위한 최적화 모형

조남석,Cho, Namsuk 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.2

Purpose: It is critical to design a set of experiments in Test and Evaluation Process for a weapon system. Because there is no sufficient resources in real-world, one must choose a subset of experiments which is considered to be more important. Methods: We introduce an optimization model for choosing the subset of experiments by considering a priority of experimental variable and level and restrictions of resources. We describe in detail how we construct objective function and constraints which must be a right realization of our logic and assumption. Conclusion: Since our optimization model turns out to be computationally difficult to solve, we introduce an algorithm for reducing the size of problem. Various computational results follows.

알코올을 이용한 라섹 수술에서 각막상피 분리에 영향을 미치는 인자

조남석,김동희,진경현,Nam Suk Cho,MD,Dong Hee Kim,MD,Kyung Hyun Jin,MD,PhD 대한안과학회 2011 대한안과학회지 Vol.52 No.6

Purpose: To evaluate the factors associated with unsuccessful cleavage of corneal epithelium in alcohol-assisted LASEK. Methods: A total of 274 eyes in 137 patients who had received alcohol-assisted LASEK were enrolled in the present study. Associations of central corneal thickness, refractive error, pre-operative corneal curvature, ablation depth, anterior chamber volume and depth, and history of wearing contact lenses with epithelial cleavage were investigated. Results: Complete epithelial cleavage was achieved in 198 eyes (72.3%) and incomplete epithelial cleavage in 76 eyes (27.7%). A history of wearing contact lenses (p = 0.018), continuous use of contact lenses (p = 0.034), longer use of contact lenses (p = 0.000), anterior chamber volume (p = 0.012) and depth (p = 0.012) were significantly associated with incomplete epithelial cleavage. Conclusions: Alcohol-assisted LASEK may cause problems in patients who experience continuous use of contact lenses and longer use of contact lenses. Patients with incomplete epithelial cleavage have small anterior chamber volume and shallow anterior chamber depth. J Korean Ophthalmol Soc 2011;52(6):665-670

국방 M&S의 가상군 행위 모델링 방법론 연구: 조사와 미래방향을 중심으로

조남석,문호석,변재정,Cho, Namsuk,Moon, Hoseok,Pyun, Jai Jeong 한국시뮬레이션학회 2020 한국시뮬레이션학회 논문지 Vol.29 No.2

인구수 감소와 국방개혁으로 인한 병력 감축, 4차 산업혁명 기술의 초고도화에 따른 기술적 요인으로 국방 M&S의 개체를 자동화 모의하는 것은 이제 군의 현실적인 목표가 되었다. 자동화 모의 기술의 사용자인 군과 기술을 개발해야 하는 공학자들의 공통된 방향설정이 필요한 시점이다. 본 연구는 향후 국방 M&S의 자동화 모의 연구를 위한 가이드라인을 제시한다. 이를 위해, 먼저 자동화 모의를 가능하게 방법론들 규칙-기반방법, 에이전트-기반방법, 학습-기반방법에 대해 논의하고, 이어서 이러한 방법론을 어떠한 방향으로 개발해야 하는지에 대해 논의한다. 연구를 통해 국방 M&S의 자동화 모의 기술 연구가 본격화 되고, 군과 개발자 사이의 간극이 좁혀지기를 기대한다. Immediate and serious attention on CGF(computer generated forces) behavior modeling for defense M&S (modeling & simulation) is required in response to the reduction in the number of troops and development of 4^th industrial technologies. It is crucial for both military person and engineer to understand such technologies. The research aims to provide guidelines for establishment of research direction on CGF behavior modeling. We investigate traditional and/or novel methodologies such as rule-based, agent-based, and learning-based method. Discussions on future direction of applicable area and strategies are followed. We expect that the research plays a key role for understanding CGF behavior modeling.

라섹수술 후 발생한 중심성 독성 각막병증 1예

조남석,박진형,진경현,Nam-Suk Cho,MD,Jin-Hyoung Park,MD,Kyung-Hyun Jin,MD,PhD 대한안과학회 2010 대한안과학회지 Vol.51 No.5

Purpose: We report a case of transient corneal opacity and hyperopia after LASEK surgery. Case summary: A 21-year-old female visited our clinic complaining of decreased visual acuity in the left eye. The patient had undergone LASEK surgeryten days previously. Before LASEK surgery, the central corneal thickness of the left eye was 540 μm, and the refractive error was -2.00 Dsph=-0.75 Dcyl ×80A with an estimated ablation depth of 52.2 μm. At the time of visit (on the tenth day after surgery), the best corrected visual acuity (BCVA) was 0.07, the central corneal thickness was 404 μm, and the refractive error was +1.00D=+1.25D ×90. Slit-lamp biomicroscopy showed round central corneal haziness, but there were no signs of inflammation. At the third weeks after surgery, the central corneal thickness was 401 μm and the refractive error was +11.25D=-4.00D ×145. Slit-lamp biomicroscopy showed sustained round central corneal haze. Twenty-two weeks after surgery, the central corneal thickness was 445 μm and the refractive error was -0.75D=-1.25D ×180. The corneal opacity had disappeared. Conclusions: In case of transient corneal opacity, stromal loss and hyperopic change after LASEK surgery, central toxic keratopathy should be considered. J Korean Ophthalmol Soc 2010;51(5):769-773

Inducer 를 이용한 목재부후균으로부터 Laccase 효소의 생산

조남석,김영신,방명혁,최윤정,남장현,안드레 레오노비취 ( Nam Seok Cho,Y . S . Kim,M . H . Pang,Y . J . Choi,J . H . Nam,A . Leonowicz ) 한국목재공학회 1997 한국목재공학회 학술발표논문집 Vol.1997 No.-

가압리화이닝법에 (加壓) 의한 젓나무의 고수율펄프 (高收率) 제조에 관한 연구

조남석,조병묵 ( Nam Seok Cho,Byoung Muk Jo ) 한국산림과학회 1981 한국산림과학회지 Vol.53 No.1

Neutral sulfite precooked fir chips were refined in the Asplund Laboratory Defibrator at various temperature (20℃, 120℃ and 180℃). The effects of refining temperatures on the physical property and morphological structure of the resulting pulps were discussed. Yields of precooked chips (84%, 92% and 100%) and refining temperature affected remarkably the yield of refined pulp, its beatability, sheet strength and morhphological characteristics, Pulp yield and beatability decreased with increasing refining temperature. Fiber surface of unbeaten pulp from precooked chips of 84% yield was to some extent covered by the secondary wass, while that of the pulp form precooked yield of 92% by the compound middle lamella. In the case of uncooked chips, fibers were damaged heavily, and the exposed fiber surface resulted from the equal amount of the secondary wall and the compound middle lamella. In the case of pulps prepared from precooked chips of higher yields (92% and 100%), sheet strength increased linearly as sheet density increased, But at the same sheet density, pulp from lower precooked yield (84%) had better sheet strength after open discharge refining as compared to pressurized refining, because pulp from the former had much amounts of fines fraction of higher water retention value than the latters. And there was observed a little difference in fiber length distribution buty nearly similar in its morphology with increasing refining temperature.

목질계 폐바이오메스의 발효열이용 열교환기의 개발

조남석 ( Nam Seok Cho ),최태호 ( Tae Ho Choi ),김홍은 ( Hong Eun Kim ),이석호 ( Suk Ho Lee ),이충구 ( Chung Koo Lee ) 한국목재공학회 2009 목재공학 Vol.37 No.1

미세섬유가 고수율펄프의 저질에 미치는 영향

조남석 ( Nam Seok Cho ) 한국산림과학회 1982 한국산림과학회지 Vol.57 No.1

Fines in high-yield sulfite pulp have much higher water retention value as compared with fines in Stone groundwood pulp. Therefore, they are apt to adhere partially or entirely onto the fiber surface during the paper making. This tendency is greatly enhance with decrease of the pretreated yield and increase of the water retention value of fines. Fines, which adhere onto the fiber surface in paper, contribute to the light scattering of the paper. Accordingly, the specific scattering coefficient of fines in high-yield sulfite pulp is considerably lower than that of fines in stone groundwood pulp, which hardly adhere onto the fiber surface. The fact that high-yield sulfite pulp is inferior to stone groundwood pulp in opacity is explained on the basis of the high degree of swelling of fined in addition to the softening of fiber fraction.

단계적 분쇄법에 의해 조제된 활엽수 MWL 에 관한 연구

조남석 ( Nam Seok Cho ) 한국산림과학회 1979 한국산림과학회지 Vol.45 No.1

Ultraviolet microscopy of ultrathin sections of wood has proved to be one of the useful means for determining the lignm distribution in the various regions of the cell wall. Also, spectral approach and quantitative analysis of isolated compound middle lamella fraction from birch xylem have revealed that the lignin associated with the vessel secondary wall and middle lamella is composed predominantly of gualacylpropane units. Lignin deposited in the fiber and ray parenchyma secondary walls is composed mostly of syringylpropane units. The middle lamella lignin around fibers and ray cells contains both guaiacyl and syringyl propane quits. On the basis of the results above, this research was carried out to clarify the origin of milled wood lignin (MWL) by analysing the chemical characteristics of ML MWLs extracted at various milling stages. The amount of phenolic hydroxyl-, α-carbonyl-, and methoxyl-group in the MWL`s increases the milling time. And progressive mining contributes to the merease of ratio of synngylaldehyde to vanillin(S/V ratio) after nitrobenzene oxidation of MWL. Accordingly, It could be concluded that milled wood lignin extracted at the initial milling stage derives from compound middle lamella region of cell wall, whereas, with progressive milling, lignin of secondary wall of fiber is introduced gradually to milled wood lignin. These results are suggesting that heterogeneous chemical structure of lignins in hardwood exists. Although milled wood lignin at the initial stage seems to have lower molecular weight in comparison with milled wood lignin extracted at final milling stage from the result of Gel-filtration curves, further study would be required on molecular weight distribution of milled wood lignin in future

바이오에너지생산을 위한 목질계 폐바이오매스의 발효

조남석 ( Nam Seok Cho ),최태호 ( Tae Ho Choi ) 한국목재공학회 2008 목재공학 Vol.36 No.6