권영만 노스웨스턴대학교 건설 및 환경공학과 박사후 연구원

권영만 한국지반공학회 2024 지반 : 한국지반공학회지 Vol.40 No.2

집적영상 기술에서의 요소영상 배열을 생성하기 위한 Fast 알고리즘

권영만,김은수 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.11

본 논문에서는 컴퓨터적으로 생성하는 집적영상 시스템에서 요소영상 배열을 생성하기 위한 새로운 fast 알고리즘을 제안한다. 이 알고리즘은 깊이 정보를 사용해서 요소영상 배열을 생성하며, 경계 영역 개념을 도입하여 경계영역 내에 있는 복셀에 대해서만 연산을 수행하여 알고리즘의 계산 속도를 개선하였다. 제안된 알고리즘과 기존 알고리즘의 계산 시간을 이론적 및 실험적으로 비교한 결과 제안된 알고리즘이 더 효율적임을 증명하였다.

소형 연 X-선 현미경

권영만,김한경,강성훈,김경우,윤권하 원광대학교 대학원 2008 論文集 Vol.41 No.-

A Soft x-ray microscope operates in the 'water window' wavelength region (2.3-4.4 nm), where natural contrast between carbon (protein) and oxygen (water) allows to image a biological cell. The compact soft x-ray microscope operates at λ = 2.88 nm (430 eV) and consist of liquid-nitrogen-jet-target laser-plasma x-rays source, a tandem ellipsoidal condenser mirror for sample illumination, an objective micro zone plate, and a thinned back-illuminated charge coupled device with 1,024 × 1,024 pixels. The Liquid-nitrogen-jet-target laser-plasma source was a high brightness of 1.4×10^(12) photons/pulse·sr·line. The tandem ellipsoidal condenser mirror has 15% reflectivity. The photon flux arrived at the sample is 1.29×10^(5) photons/μ㎡ The micro zone plate was used for an objective optic, and had outermost zone width of 30 nm, zone number of 667, and diameter of 80㎛, and the focal length was 835㎛. On performance test for the compact soft x-ray microscope, the 'Siemens Star' image was obtained with a 60-nm-resolution at 380 magnification and 3 minutes exposure. I also obtained images of biological samples, such as diatom and red blood cell of a mouse with 5-10 minutes exposure.

Development of Applications for Disaster Safety Management of Traditional Markets

권영만,갈원모 대한설비관리학회 2017 대한설비관리학회지 Vol.22 No.4

While traditional markets have functioned as major trade centers that regulated regional economy in Korea in the past, they have lost their significance and popularity over the last few decades due to the expansion of Internet shopping and development of superstores and convenience stores. With lack of support from the local government, the traditional markets in the Gyeonggi province became outdated and incapable of competing against modern forms of markets. Antiquated facilities as well as insanitary surroundings of traditional markets incapacitated them from retaining their customers, and traditional markets were soon overshadowed by superstores. With close examination of the Sung-ho traditional market, an embryonic traditional market located in Jung-won gu, Sungnam city, this study aims to identify major safety problems of traditional markets. Further, the study will also introduce a smartphone disaster management application to redress those problems.

Respiratory Syncytial Virus Fusion Protein-encoding DNA Vaccine Is Less Effective in Conferring Protection against Inflammatory Disease than a Virus-like Particle Platform

권영만,황혜숙,이영태,김기혜,이유리,김민철,이유나,Fu Shi Quan,Martin L. Moore,강상무 대한면역학회 2019 Immune Network Vol.19 No.3

Formalin-inactivated respiratory syncytial virus (RSV) vaccination causes vaccine-enhanced disease (VED) after RSV infection. It is considered that vaccine platforms enabling endogenous synthesis of RSV immunogens would induce favorable immune responses than non-replicating subunit vaccines in avoiding VED. Here, we investigated the immunogenicity, protection, and disease in mice after vaccination with RSV fusion protein (F) encoding plasmid DNA (F-DNA) or virus-like particles presenting RSV F (F-VLP). F-DNA vaccination induced CD8 T cells and RSV neutralizing Abs, whereas F-VLP elicited higher levels of IgG2a isotype and neutralizing Abs, and germinal center B cells, contributing to protection by controlling lung viral loads after RSV challenge. However, mice that were immunized with F-DNA displayed weight loss and pulmonary histopathology, and induced F specific CD8 T cell responses and recruitment of monocytes and plasmacytoid dendritic cells into the lungs. These innate immune parameters, RSV disease, and pulmonary histopathology were lower in mice that were immunized with F-VLP after challenge. This study provides important insight into developing effective and safe RSV vaccines.

국내에서 생장한 Kenaf의 해부학적 특성

권영만,황원중,권성민,조준형,이명구,김남훈 江原大學校 森林科學硏究所 2005 Journal of Forest Science Vol.21 No.-

국내에서 재배한 kenaf의 해부학적 특성을 광학현미경법으로 조사하였다. Kenaf의 수피부에는 인피섬유, 사부방사조직, 피층유세포 등이 존해하였고, 목질부는 도관, 목섬유, 방사조직 등으로 구성되어 있었다. 도관은 고립관공과 2~3개가 방사방향으로 복합한 복합관공이 많이 존재하였고, 방사조직은 평복, 직립, 방형세포가 모두 분포하고 있었다. 접선단면에서 방사조직은 단열 및 다열방사조직으로 구성되었다. 수피비의 인피섬유층은 생장기간과 함께 증가하였다. Anatomical properties of Kenaf cultivated in Korea was investigated using light microscopy. Bast fiber, phloem ray and cortex parencyma cell were observed in bast, and vessel, wood fiber and rat in core. A lot of solitary and multiple radial pores in core existed. The cell type of ray parenchyma in radial section was procumbent, upright and square sell. Uniseriate and multiseriate rays existed in tangential section. The layer of bast fiber in bast increased with in creasing the growth period.

DCT를 사용한 디지털 하프토닝

권영만,김규호,권형준 한국인터넷방송통신학회 2013 한국인터넷방송통신학회 논문지 Vol.13 No.6

이 논문에서는 먼저 디지털 하프토닝 영상을 생성하는 기존의 방법들과 DCT 변환에 대해서 설명한다. 그런 후에 DCT 변환에 근간을 둔 새롭고 단순한 하프토닝 알고리즘을 제안한다. 이 논문은 제안한 알고리즘을 검정하기 위해서 실현 가능성 검증을 수행한다. 그래서 DCT 계수의 가중치를 조절하여 생성된 여러 가지 영상들을 평가하였 다. 실험을 통해서 단순한 이상적인 계단 함수 형태의 가중치를 사용하는 것보다는 램프 함수 형태의 가중치를 사용 하면 더 좋은 결과를 얻었다. 단순한 응용분야로서 MPEG 비디오에 제안한 알고리즘을 적용하여 하프토닝 비디오를 생성할 수 있다. In this paper, we discussed the traditional methods of generating digital halftoning image and DCT transform. Then we propose a new and simple halftoning algorithm that is based on DCT transformation. We do the feasibility test to verify the proposed algorithm. So we assessed several images generated by adjusting weights of DCT coefficients. As a result, we got the better result for weights of the ramp function type than for weights of the step function type through experiment. As a simple application, we can apply our algorithm to the MPEG video for generating the halftoning video.

화일 시스템의 저장 장치 관리 기법에 관한 연구

권영만 서울保健大學 1994 論文集 Vol.14 No.1

Next-generation workstations will have hardware support for digital continuous media (CM) such as audio and video. CM application handle data at high rates, with strict timing requirements, and often in small chunks. If such applications are to run efficiently and predictably as user-level programs, an operating system must provide efficient file system, scheduling and IPC mechanisms that reflect these needs. The storage devices offer huge storage capacity at a low cost per byte, but with large access times. Disk technology is improving rapidly, but the improvements have been primarily in the area of cost and capacity rather than performance. So in this paper, we will survey the several mechanism to improve the performance in term of access time. These are the traditional UNIX file system, fast file system, log-structed file system, logical disk, and file system for digital audio/video. This study is necessary for supporting continuous media even though we will get more fast disk.

롯데칠성 실론티 ' 93 광고 캠페인

권영만 한국광고학회 1994 광고학연구 Vol.5 No.1

실시간 우선순위 반전 관리에 관한 연구

권영만 서울保健大學 1995 論文集 Vol.15 No.1

In real-time systems preemptive priority driven schedulers are used to schedule jobs to meet the timing requirements. When jobs share common resources, unbounded priority inversion can be occured. It makes real-time system unpredictable. To improve the schedulability of the system, we need to solve the priority inversion problem. In this paper, we survey a several protocols to eliminate unbounded priority inversion. The simplest one is to disable preemption during the execution of all critical sections. The others are basic priority inheritance protocoI(BPI) and priority ceiling protocols(PCP).