• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 춘계학술대회 논문집
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• pp.473-476
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• 2008

In this paper, we designed the main mechanism of high throughput device for rod-cuts of spent fuel. For this, we analyzed the mechanical methods(slitting, ball mill, roller straightening) and chemical methods(muffle furnace, rotary kiln). As the results, methods of ball drop and rotary drum for concepts design were selected in the analysis step. For enhancement of oxidation rate, we devised the blades on the reactor with mesh type. Also, for enhancement of decladding rate, we designed ball size and rotation reactor with mesh type and devised the vacuum system for fission products. Mechanisms of oxidation and recovery can simultaneously handle the rod-cuts of spent fuel and independently recover. The results of mechanism design can be used for scale-up of high throughput device.

• Journal of Information Processing Systems
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• 제10권2호
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• pp.193-214
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• 2014

Load balancing is the major benefit of any distributed system. To facilitate this advantage, task duplication and migration methodologies are employed. As this paper deals with dependent tasks (DAG), we used duplication. Task duplication reduces the overall schedule length of DAG along-with load balancing. This paper proposes a new task duplication algorithm at the time of tasks assignment on various processors. With the intention of conducting proposed algorithm performance computation; simulation has been done on the Netbeans IDE. The mesh topology of a distributed system is simulated at this juncture. For task duplication, overall schedule length of DAG is the main parameter that decides the performance of a proposed duplication algorithm. After obtaining the results we compared our performance with arbitrary task assignment, CAWF and HEFT-TD algorithms. Additionally, we also compared the complexity of the proposed algorithm with the Duplication Based Bottom Up scheduling (DBUS) and Heterogeneous Earliest Finish Time with Task Duplication (HEFT-TD).

• Nuclear Engineering and Technology
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• 제15권2호
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• pp.87-97
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• 1983

본 연구에서는 평형로심 특성을 계산하기 위하여 로심 해석용 코드인 WBURN (2-D, 2-group, coarse mesh)을 개발하여 월성 원자로의 평형 로심 특성을 해석하고 최종 안전성 보고서에 주어진 결과와 비교하였다. 그리고 최근에 입수된 설계상수들의 변화에 기인된 평형로심 특성변화를 조사하였으며, 월성 원자로의 가동 조건이 변화되어 핵연료의 연소도를 약 5% 높일 수 있음이 나타났다.

• Journal of Minimally Invasive Surgery
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• 제21권4호
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• pp.177-179
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• 2018

A rectocele with a weakened rectovaginal septum can be repaired with various surgical techniques. We performed laparoscopic posterior vaginal wall repair and rectovaginal septal reinforcement without mesh using a modified transperineal approach. A 63-year-old woman with outlet dysfunction constipation complained of lower pelvic pressure and sense of heaviness for 30 years. Initial defecography showed an anterior rectocele with a 45-mm anterior bulge and perineal descent. Laparoscopic procedures included peritoneal and rectovaginal septal dissection directed toward the perineal body, rectovaginal septal suturing, and peritoneal closure. The patient started a soft diet the following day and was discharged on the 5th postoperative day without any complications. The patient had no dyschezia or dyspareunia, and no problem with bowel function; 3-month follow-up defecography showed a decrease in bulging to 18 mm. Laparoscopic posterior vaginal wall and rectovaginal septal repair is safe and feasible for treatment of a rectocele, and enables early recovery.

• 대한설비공학회지:설비저널
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• 제5권2호
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• pp.91-97
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• 1976

This study was concerned with performance of 2 types of black painted solar air heaters, one is finned type better, the other is mesh type. The performance test of heaters was made under the different operating conditions during winter season of December in Seoul area. It was analized and discussed by comparing the overall efficiency of 2 solar heaters at the same mass flow rate and ambient temperature. Experimental results show that finned type solar heater is better than mesh type from the point of view of design and heat removal efficiency. Finned-type solar air heater supplies hot air up to 30 degree centigrade above ambient temperature with an overall efficiency of 47 percent whilemesh type was 44 percent.

• Archives of Plastic Surgery
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• 제37권5호
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• pp.717-720
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• 2010

Purpose: Absorbable plate and screw fixation is widely used technique for internal rigid fixation in craniomaxillofacial surgery. However, there are some potential problems associated with the use of plate. The purpose of this study is to evaluate the feasibility of bone fixation in facial fracture using absorbable mesh in place of absorbable plate. Methods: The records of 55 patients with zygomaticomaxilla fractures treated by open reduction, performed by the author from February 2008 to May 2009, were retrospectively reviewed. Patients were selected to receive absorbable mesh fixation. The incidence of all complications including infection, hypoesthesia, and deformity was examined. Analysis with postoperative computed tomography follow-up demonstrates degree of reduction. Results: Forty-six patients met criteria for inclusion in the study. All patients went on to satisfactory healing without complication. Postoperative computed tomography revealed good bony alignment similarly non affected side. Conclusion: This study demonstrates that the rigid internal fixation of fractured bone fragments using absorbable mesh is more effective than absorbable plate, especially in comminuted fracture of maxilla.

• 대한토목학회논문집
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• 제12권4호
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• pp.59-70
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• 1992

풍하중(風荷重)을 받는 쌍곡 냉각탑의 비탄성(非彈性), 비선형(非線型) 극한(極限) 거동(擧動)을 Cray Y-MP 슈퍼 컴퓨터에 개발(開發)한 유한요소(有限要素)컴퓨터 프로그램으로 연구(研究)하였다. 유한요소 망(mesh)을 각각 잘게 잘라서 3모델을 만들고, 이 모델들을 이용하여 탄성과 비탄성 해석으로 유한요소 망의 수렴관계(mesh convergence)를 연구하였다. 연구결과 유한요소의 크기가 냉각탑의 극한거동을 예측하는데 매우 중요한 역할을 하고있음을 볼 수 있었다. 비록 쌍곡 냉각탑이 풍하중(風荷重)에 대해서 막응력(膜應力)(membrane stress)으로 저항하나, 본 연구(研究) 결과(結果) 휨응력(應力)(bending stress)도 냉각탑의 파괴와 거동(擧動)에 매우 중요한 역할을 하고 있음을 알아 내었다. 해석(解析)한 냉각탑은 형성값(Shape factor)이 1.48에 이르렀고, 이는 냉각탑의 자오선 응력(meridional stress)이 원둘레방향으로 상당히 재분배 되고 있음을 보여주는 것이다. 이러한 재분배에 대한 사실은 배치된 철근의 항복이 바람방향 자오선으로부터 $30^{\circ}C$에 까지 나타난 것으로 더욱더 뚜렷하였다. 현재의 탄성해석을 이용하는 냉각탑 설계(設計) 방법은 안전(安全)측에 있음을 보여 주었으며, 1보다 큰 형상값을 설계시에 활용하기 위해서는 더욱더 많은 연구가 선행되어야 할 것이다.

• 한국컴퓨터그래픽스학회논문지
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• 제26권4호
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• pp.17-26
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• 2020

본 논문에서는 GPU(Graphic Processing Unit) 연산을 활용하여 BCC(Body Centered Cubic) 볼륨 데이터로부터 실시간으로 메시 형태의 등가면을 추출하는 개선된 마칭 사면체(Marching tetrahedra) 기법을 제안한다. 본 기법은 고전적인 방법과 비교하여 메모리 사용량은 다소 높지만 더 좋은 성능을 보인다. 본 기법은 다섯 단계로 구성되어 있다. 첫 번째 단계는 단 한번만 수행되는 단계로, 빈 공간을 생략하여 성능을 향상 시키기 위해 최소/최댓값 블록(Min/max block)을 생성한다. 두 번째 단계에서는 등갓값(Isovalue)을 포함하고 있는 유효한 블록을 추려낸다. 이후 두 단계에서는 등가면(Isosurface)을 포함하는 셀(Cell)과 엣지(Edge)를 추출하고, 마지막 단계에서 삼각형 메시(Triangle mesh)를 생성한다. 본 기법은 512³ 이상의 고해상도 볼륨 데이터(Volume dataset)에 대한 등가면 추출 시, 삼각형 집합 형태의 등가면을 추출하는 고전적인 마칭 사면체 기법에 비해 최대 5배 정도의 속도 향상을 보인다.

• Archives of Plastic Surgery
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• 제41권4호
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• pp.355-361
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• 2014

Background A blow-out fracture is one of the most common facial injuries in midface trauma. Orbital wall reconstruction is extremely important because it can cause various functional and aesthetic sequelae. Although many materials are available, there are no uniformly accepted guidelines regarding material selection for orbital wall reconstruction. Methods From January 2007 to August 2012, a total of 78 patients with blow-out fractures were analyzed. 36 patients received absorbable mesh plates, and 42 patients received titanium-dynamic mesh plates. Both groups were retrospectively evaluated for therapeutic efficacy and safety according to the incidence of three different complications: enophthalmos, extraocular movement impairment, and diplopia. Results For all groups (inferior wall fracture group, medial wall fractrue group, and combined inferomedial wall fracture group), there were improvements in the incidence of each complication regardless of implant types. Moreover, a significant improvement of enophthalmos occurred for both types of implants in group 1 (inferior wall fracture group). However, we found no statistically significant differences of efficacy or complication rate in every groups between both implant types. Conclusions Both types of implants showed good results without significant differences in long-term follow up, even though we expected the higher recurrent enophthalmos rate in patients with absorbable plate. In conclusion, both types seem to be equally effective and safe for orbital wall reconstruction. In particular, both implant types significantly improve the incidence of enophthalmos in cases of inferior orbital wall fractures.

• 한국식품과학회지
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• 제20권4호
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• pp.463-469
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• 1988

쌀가루의 압출성형 특성을 조사하기 위하여 원료의 수분합량과 입자크기를 달리하여 자가발열형 single screw extruder로 처리하고 이때 온도변화에 따른 extrudate의 물성학적인 성질을 비교하였다. 원료의 수분함량은 17%, 19%, 22%, 25%, 28%로 했고 입자크기는 18-60mesh와 60-120mesh의 두 범위로 했다. 내부흐름의 온도는 자동 온도기록계에 기록되게 하여 정상상태 가동이 될 때까지 경시적으로 시료를 채취하였다. 팽화율은 수분함량과 입자크기가 감소함에 따라 증가하였으며, bulk density는 팽화율과 역상관 관계를 나타내었다. Extrudate의 절단력은 수분함량이 적고 입자조기가 감소함에 따라 낮아졌으며 기공의 크기도 균일하였다. 색도는 수분함량과 입자크기가 증가함에 따라 명도는 증가하였고 황색도는 감소하였다. 겉보기 점도는 수분함량이 증가함에 따라 증가했고, 수용성 지수는 감소하였다. 원료의 수분이 감소함에 따라 일부의 전분은 호정화를 유발하는 것으로 판단되었다.