• Journal of Chest Surgery
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• 제45권3호
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• pp.148-154
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• 2012

Background: The adequate management of mild to moderate dilatation of the ascending aorta during cardiac operations remains controversial. In this study, we present the short-term outcomes of 90 patients undergoing ascending aortic wrapping with a Dacron graft during other cardiac operations. Materials and Methods: From March 2008 to January 2011, 90 consecutive patients underwent treatment for ascending aortic aneurysm using the external wrapping technique during the concomitant procedure. The study group consisted of 49 male and 41 female patients with a mean age of $58.7{\pm}13$years. The primary cardiac surgical procedures were coronary artery bypass grafting (CABG) in 3, aortic valve replacement in 2, and aortic valvuloplasty in 85 patients (isolated in 62 and combined with CABG or mitral valvuloplasty in 23). The ascending aorta diameter was measured using a computed tomography scan within 4 weeks after surgery, and was compared with the preoperative value. Results: The diameters of the ascending aorta wrapped with the Dacron graft were significantly reduced within a month after surgery from $46.4{\pm}4.3$ mm to $33.0{\pm}3.5$ mm (p<0.05). There was no early mortality or major surgical complication. During the mean follow-up period of $15.4{\pm}5.2$ months, there was only one late death caused by septic multiorgan failure. Conclusion: Dacron wrapping of the ascending aorta offers excellent results with very low mortality and morbidity, and it can be regarded as a safe and effective method for the treatment of moderately dilated ascending aorta in selected patients.

• Journal of Biosystems Engineering
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• 제42권3호
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• pp.136-146
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• 2017

Purpose: This paper presents an appropriate wrapping method by analyzing the pressure distribution applied to a bale surface, along with the change in pressure according to an increase in the number of film layers in rice straw bales, which account for 74% of the total bulky feed supply in Korea. Methods: A model with the shape of an actual bale was fabricated to analyze the distribution of surface pressure in bale wrapping, and the pressure was measured. Experiments were conducted to analyze the pressure using eight different layer numbers (2, 4, 6, 8 10, 12, 14, and 16 layers) at five wrapping speeds (27, 29, 31, 33, and 35 rpm). Results: The maximum pressure applied to a circular bale by the film occurred at the center of the end of the bale, whereas the minimum pressure occurred at the center of the bale side. An extreme value ratio between the minimum and maximum pressures was distributed as 8.5-56.6%, which was improved with an increase in rotation speed. The an uneven pressure distribution occurred because the number of film overlaps was 8.24-times greater at the center of the bale's end than at the center of the ba le side. At a level 5 rotation speed, the minimum pressure was $P_{LV5-M1}=0.0625{\sigma}^2+36.173{\sigma}-36.753$ ($R^2=0.9845$) at $M_1$, and the maximum pressure was $P_{LV5-M6}=5.5552{\sigma}^2+41.05{\sigma}-39.071$ at $M_2$, revealing a correlation of $R^2=0.9983$. Conclusions: To replace four layers with six layers, 2-4 layers were added only to the side of the bale, and the minimum pressure at $M_1$ was then improved from that at four layers to that at six layers, and the amount of film consumed for 4-6 layers was reduced by 84.6%.

• 정보처리학회논문지A
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• 제14A권3호
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• pp.133-140
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• 2007

SWBF(shrink-wrapped boundary face) 알고리즘은 조직되지 않은 3차원 측정점으로부터 표면을 재구성하기 위해 최근에 제안된 방법이다. 본 논문에서는 SWBF 알고리즘의 표면 중복문제를 제기하고, 이를 해결하기 위한 개선된 표면 재구성 방법을 제안한다. 제안된 방법은 경계셀이 아닌 모든 셀들을 내부셀과 외부셀로 구분하고, 개선된 경계면의 정의를 이용해 초기메쉬에서 표면의 중복이 발생하지 않도록 하였다. 또한, 측정 방향에 따라 표면 샘플링의 조밀도가 차이가 나는 일반적인 3차원 스캐너로부터 추출된 데이터의 처리를 위해 셀 영상에서 2차원 연결성을 정의하여 사용하였다. 실험을 통해 제안된 방법이 SWBF 알고리즘의 표면중복문제를 극복하는데 매우 유용함을 알 수 있었다.

• 한국광학회지
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• 제17권6호
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• pp.507-513
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• 2006

본 논문에서는 출력평면에 나타나는 원 영상을 재생시키기 위하여 위상 랩핑 방법을 이용하여 암호화 수준을 향상시키고 주파수 영역에서 위상 부호화하여 암호화함으로써 잡음에 강한 복호화 방법을 제안하였다. 암호화된 영상은 원 영상이 아닌 위상 변조된 가상 영상과 무작위 위상 영상을 곱하고 제로 패딩(ze.o-padding)하여 푸리에 변환한 후 이 변환된 복소 영상을 데이터 전송 및 매핑을 용이하게 하기 위하여 실수 값으로 변환하여 위상 부호화하여 만든다. 복호화 과정은 제안한 선형적인 영상을 비선형적인 영상으로 변환시키는 위상 랩핑 방법에 의해 각각 만들어진 암호화된 영상과 복호화 키를 곱하여 푸리에 역변환하여 공간필터를 가진 출력 평면에서 원 영상을 복원함으로써 광축 정렬 문제와 픽셀 대 픽셀 대응이 용이하여 복원영상의 해상도를 향상시킬 수 있다. 제안한 방법은 허가되지 않은 사용자가 암호화된 영상을 분석함으로써 있을 수 있는 복제 가능성을 원 영상의 어떤 정보도 포함하지 않은 가상 영상을 사용함으로써 배제할 수 있고 또한 실수 값을 위상 부호화함으로써 현재에 사용되는 공간 광 변조기로 표현이 가능하다. 컴퓨터 모의 실험을 통하여 제안한 암호화 방법의 적합성과 암호화된 영상과 복호화 키 영상에 잡음이 발생하더라도 원 영상의 복원이 가능함을 확인하였다.

• Journal of the Korean Wood Science and Technology
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• 제48권4호
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• pp.513-526
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• 2020

The existing preservation methods are difficult to be applied to a large dimension log which is needed for making traditional wooden ship 'Jalur' in Riau Province. Novel techniques to provide the use of readily available species to replace traditional species alternative were investigated. These included infusion and a combination of injection and bandage-wrapping methods for preserving living trees of Balam (Macaranga conifera (Rchb.f. & Zoll.) Müll.Arg.) and Bintangor (Calophyllum soulattri Burm.f.). Water-based boron compounds were applied as wood preservatives. In total, 18 discs from the bottom, middle, and top of four trees and two controls were used. Trees undergoing treatment were also used to see how wood anatomical structure might affect the boron penetration. The overall aim was to identify the best method for use in Jalur manufacturing. The results showed that in infused Balam tree where the hose position for the preservative intake was deep (10-15 cm from the bark), no boron compound was observed in the outer sapwood. Combination of injection and bandage-wrapping method gave higher percentage of boron penetration at bottom and middle of Balam tree. However, infused Bintangor showed 100% boron penetration. The larger vessel diameter, the absence of tyloses, and the simple perforation plates in Bintangor wood were likely to have contributed to the higher penetration of boron. The combination of bandage-wrapping and infusion, or alternatively by infusing the living trees close to the bark, and at as low as position in the stem gives better protection when treatments are applied to living trees.

• 한국초지조사료학회지
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• 제21권2호
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• pp.75-80
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• 2001

This experiment was carried out to determine the effect of storing method and wrapping frequency on the quality of round baled rice straw silage at experimental field of Grassland and Forage Crops Division, National Livestock Research Institute, RDA, Suwon fro 1999 to 2000. Storing methods consisted of erect and lay type, and wrapping frequencies were composed to 2, 4, 6, 8 and 10 film layers. there were no significant difference in feed value between storing methods, but acidity of lay type was significantly higher than that of erect type. According to the wrapping frequency, crude protein(CP) content of 2 film layers treatment was lowest during 6 month storing periods, and that of 4 film layers treatment was lowest during 10 month storing periods. The two film layers treatment which was stored for 10 month was impossible for ruminant to feed it, because it was rotten severely. Storing for 6 month, 2 film layers treatment represented highest pH value by 8.23 and storing for 10 month, 4 film layers treatment showed highest pH value by 7.17. Most of silage ranked grade 3 in quality grade. According to this experiment, it was recommended that application of round bale silage system to fresh rice straw should wrap above 4 film layers for 6 month, and above 6 film layers for 10 month storing periods.

• Archives of Plastic Surgery
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• 제43권1호
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• pp.84-87
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• 2016

Titanium micro-mesh implants are widely used in orbital wall reconstructions because they have several advantageous characteristics. However, the rough and irregular marginal spurs of the cut edges of the titanium mesh sheet impede the efficacious and minimally traumatic insertion of the implant, because these spurs may catch or hook the orbital soft tissue, skin, or conjunctiva during the insertion procedure. In order to prevent this problem, we developed an easy method of inserting a titanium micro-mesh, in which it is wrapped with the aseptic transparent plastic film that is used to pack surgical instruments or is attached to one side of the inner suture package. Fifty-four patients underwent orbital wall reconstruction using a transconjunctival or transcutaneous approach. The wrapped implant was easily inserted without catching or injuring the orbital soft tissue, skin, or conjunctiva. In most cases, the implant was inserted in one attempt. Postoperative computed tomographic scans showed excellent placement of the titanium micro-mesh and adequate anatomic reconstruction of the orbital walls. This wrapping insertion method may be useful for making the insertion of titanium micro-mesh implants in the reconstruction of orbital wall fractures easier and less traumatic.

• ETRI Journal
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• 제27권2호
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• pp.235-238
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• 2005

A new mesh reconstruction scheme for approximating a surface from a set of unorganized 3D points is proposed. The proposed method, called a shrink-wrapped boundary face (SWBF) algorithm, produces the final surface by iteratively shrinking the initial mesh generated from the definition of the boundary faces. SWBF surmounts the genus-0 spherical topology restriction of previous shrink-wrapping-based mesh generation techniques and can be applied to any type of surface topology. Furthermore, SWBF is significantly faster than a related algorithm of Jeong and others, as SWBF requires only a local nearest-point-search in the shrinking process. Our experiments show that SWBF is very robust and efficient for surface reconstruction from an unorganized point cloud.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2005년도 춘계학술발표대회
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• pp.1263-1266
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• 2005

댁내의 제어 네트워크는 냉장고, 세탁기, 전자레인지 같은 가전제품과 전등, 가스 경보기, 보일러 등에서 제품 고유의 기능을 수행하기 위하여 일반적으로 8Bit 이하의 비교적 저 기능의 마이컴을 채용하고 있으며 각각의 통신을 위한 각 기기 고유의 통신 프로토콜을 가지고 있다. 이렇게 각각 다른 통신 방식으로 인하여 실제적으로 하나의 통합된 댁내 제어 네트워크 구성은 매우 어렵다. 이에 기존 제어기기 각각의 프로토콜을 유지한채 모든 제어기기의 프로토콜을 수용할 수 있는 방법은 새로운 프로토콜을 만들어 기존 기기의 프로토콜을 Wrapping 하는 방법이다. 본 논문에서는 기존 제어기기들의 통신 프로토콜을 Wrapping 할 수 있는 통합 프로토콜을 구현하여 하나의 통일된 제어 네트워크를 구성할 수 있도록 하였다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2006년도 한국컴퓨터종합학술대회 논문집 Vol.33 No.1 (A)
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• pp.133-135
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• 2006

단층촬영영상(Tomographic cross-section images)으로부터 임의의 등밀도 표면(iso-density surface)을 재구성하기 위한 새로운 방법을 제안하였다. 이 방법에서는 마칭큐브 알고리즘에 비해 정밀도는 떨어지지만 안정적인 표면을 생성하는 셀경계 알고리즘(Cell-Boundary Method)을 이용하여 초기메쉬를 구하고 이를 표면축소포장(Shrink-wrapping)처리를 통해 정밀한 등밀도 표면을 생성하게 된다. 이는 마칭큐브와 같이 단층영상에서 등밀도 표면을 직접 추출하는 것이 아니라 등밀도점(iso-density Point)을 먼저 추출하고 표면의 모호성이 없는 안정적인 초기메쉬를 이들 방향으로 축소하여 정확한 표면모델링을 가능하게 한다. 이를 통해 마칭큐브에서 발생하는 표면 결정의 모호성이 없이 보다 안정적인 표면을 정확하게 만들 수 있다.