급성 일산화탄소 중독에 의한 난청의 1례

김대운 대한이비인후과학회 1973 대한이비인후과학회지 두경부외과학 Vol.16 No.-

호환성 및 속도 향상을 위한 FPGA 기반 DDR 메모리 인터페이스의 최적화

김대운,강봉순,Kim, Dae-Woon,Kang, Bong-Soon 한국정보통신학회 2021 한국정보통신학회논문지 Vol.25 No.12

첨단산업의 발전에 따라 영상처리 하드웨어의 연구는 필수적이고, 실제 칩 동작을 위해서는 게이트 수준의 타이밍 검증이 필요하다. 이를 위해 주로 FPGA 기반 검증이 이루어지는데 기존에는 DDR3 메모리 인터페이스를 적용했지만, 최근에는 FPGA 스펙이 향상되면서 DDR4 메모리가 사용된다. 이 때 기존에 사용하던 메모리 인터페이스를 적용하면 CPU와 메모리의 성능 차이에 의한 신호들의 타이밍 불일치가 발생하기 때문에 사용할 수 없다. 본 논문에서는 기존 인터페이스 시스템 FSM의 State 최적화를 통해 문제를 해결하고, 이 과정에서 AXI Data Width 수정을 통해 데이터 읽기 속도를 2배 증가시킨다. 실제 사례 분석을 위해 Xilinx 사의 SoC보드 중 DDR3 메모리를 사용하는 ZC706과 DDR4 메모리를 사용하는 ZCU106을 사용한다. With the development of advanced industries, research on image processing hardware is essential, and timing verification at the gate level is required for actual chip operation. For FPGA-based verification, DDR3 memory interface was previously applied. But recently, as the FPGA specification has improved, DDR4 memory is used. In this case, when a previously used memory interface is applied, the timing mismatch of signals may occur and thus cannot be used. This is due to the difference in performance between CPU and memory. In this paper, the problem is solved through state optimization of the existing interface system FSM. In this process, data read speed is doubled through AXI Data Width modification. For actual case analysis, ZC706 using DDR3 memory and ZCU106 using DDR4 memory among Xilinx's SoC boards are used.

FPGA 기반 성능 개선을 위한 CIE1931 색역 변환 알고리즘의 최적화된 하드웨어 구현

김대운,강봉순,Kim, Dae-Woon,Kang, Bong-Soon 한국정보통신학회 2021 한국정보통신학회논문지 Vol.25 No.6

본 논문에서는 기존 CIE1931 색역 변환 알고리즘의 최적화된 하드웨어 구현 방법을 제안한다. 안개제거 알고리즘의 후처리 방법 중 비교적 연산량이 적은 기존 알고리즘은 연산 과정에서 Split multiplier를 사용한 큰 비트의 계산으로 하드웨어 자원 소모량이 크다는 단점이 있다. 제안하는 알고리즘은 기존 알고리즘의 미리 정의된 2번의 행렬 곱셈 연산을 하나로 줄임으로써 연산량 감소, 하드웨어 소형화를 실현하였고, Split multiplier 연산을 최적화시킴으로써 탑재하기에 더욱 효율적인 하드웨어를 구현하였다. 하드웨어는 Verilog HDL 언어로 설계하였고, Xilinx Vivado 프로그램을 이용한 논리합성 결과를 비교하여 4K 표준 환경에서 실시간 처리가 가능한 성능을 확인하였다. 또한, 2가지 FPGA에서의 탑재 결과를 통해 제안하는 하드웨어의 성능을 검증하였다. This paper proposes an optimized hardware implementation method for existing CIE1931 color gamut control algorithm. Among the post-processing methods of dehazing algorithms, existing algorithm with relatively low computations have the disadvantage of consuming many hardware resources by calculating large bits using Split multiplier in the computation process. The proposed algorithm achieves computational reduction and hardware miniaturization by reducing the predefined two matrix multiplication operations of the existing algorithm to one. And by optimizing the Split multiplier computation, it is implemented more efficient hardware to mount. The hardware was designed in the Verilog HDL language, and the results of logical synthesis using the Xilinx Vivado program were compared to verify real-time processing performance in 4K environments. Furthermore, this paper verifies the performance of the proposed hardware with mounting results on two FPGAs.

Camera localization with Siamese neural networks using iterative relative pose estimation

김대운,Ko Kwanghee 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.4

This paper presents a novel deep learning-based camera localization method using iterative relative pose estimation to improve the accuracy of pose estimation from a single RGB image. Although most existing deep learning-based camera localization methods are more robust for textureless cases, illumination changes, and occlusions, they are less accurate than other non-deep learning-based methods. The proposed method improved the localization accuracy by using the relative poses between the input image and the training dataset images. It simultaneously trained the network for the absolute poses of the input images and their relative poses using Siamese networks. In the inference stage, it estimated the absolute pose of a query image and iteratively updated the pose using relative pose information. Real world examples with widely used camera localization datasets and our dataset were utilized to validate the performance of the proposed method, which exhibited higher localization accuracy than the state-of-the-art deep learning-based camera localization methods. In the end, the application of the proposed method to augmented reality was presented.

Analysis of the essential oil composition of fresh Panax ginseng root and identification of novel phenylalkenal compounds

김대운,김영회,김태영,최한석,김명곤 한국식품저장유통학회 2023 한국식품저장유통학회지 Vol.30 No.6

This study investigated the essential oil composition of fresh Panax ginseng root and identified novel compounds from ginseng oil. The oil was divided into five fractions (neutral, basic, phenolic, acidic, and aldehydic). In total, 149 constituents, including 29, 19, and 38 compounds in the basic, phenolic, and aldehydic fractions, respectively, were identified by gas chromatography (GC) and GC-mass spectrometry (MS). The primary constituents of the total ginseng volatile oil were α-humulene (13.91% as a peak area), bicyclogermacrene (13.59%), β- caryophyllene (8.24%), α-neoclovene (7.78%), and α- and β-panasinsenes (5.14% and 7.53%). The primary constituents of the basic fraction were 2-isopropyl-3- methoxypyrazine (35.51%), 3-sec-butyl-2-methoxy-5-methylpyrazine (31.54%), 2- isobutyl-3-methoxypyrazine (8.64%), and 2-methoxy-3-methylpyrazine (8.40%), whereas in the phenolic fraction, these were benzoic (25.40%), octanoic (11.57%), nonanoic (9.16%), propionic (6.35%), and decanoic acids (6.16%). The primary constituents of the aldehydic fraction were 4-(2-furyl)-3-buten-2-one (23.41%), benzaldehyde (10.18%), cis-2-heptanal (9.42%), 3-(α-furyl)-propenal (8.51%), and 2-phenyl-2-butenal (7.28%). Among these, the phenylalkenal compounds, including 2-phenyl-2-butenal, 2-methyl-3-phenyl-2-propenal, 5-methyl-2-phenyl-2-pentenal, 5-methyl-2-phenyl-2-hexenals, 2-phenyl-2-octenal, and 2-phenyl-2-nonenal, were newly identified in this study as ginseng volatile constituents. Furthermore, 2- phenyl-2-nonenal was identified as a plant-based volatile constituent for the first time in this study.

구미시 안전도시 구현을 위한 대책과 과제: 손상사망 예방을 중심으로

김대운,이미화 한국치안행정학회 2018 한국치안행정논집 Vol.14 No.4

This study aims to understand the effectiveness of the Safe City Program relating to intentional self-harm injury prevention in Gumi city, which achieved recognition as an International Safe Community by the World Health Organization on September 20th, 2017. In doing so, this study aims to inform and present the possible policy direction of the program; then derive the recommended direction of the injury management strategy that would help promote the local safety. After analyzing the causes of death by injury types, the study found that ① the suicide injury was over-represented among the top three causes of death in Gumi city encompassing traffic accidents, suicide and falls, ② roughly 1 out of every 2 death were ultimately caused by intentional self-inflicted suicidal injury, ③ yet, besides the suicide rate, it was found that the existing safety measures against unintentional risks(poisoning, drowning, fire, bicycle accidents, suffocation, etc) were quite effective and even far ahead of other international countries. Based on the review, it was determined that the essence of the death problem in Gumi was largely attributable to the lack of social safety net for the high-risk aged group aged 64 and over. Thus, this study proposed a need for more vigorous strategies aimed at the elderly support programs and social services that would provide a buffer against suicide and self-injury. 이 연구는 지난 2017년 9월 20일, ‘국제안전도시 공인 선포식’을 열고 회원도시 자격 획득을 공표한 구미시에서 현재 운용되고 있는 국제안전도시 손상사망 예방 프로그램에 대해 알아보고, 구미시 고유 손상원인에 특화된 프로그램들의 정책적 운용방향을 제시함으로써, 지역안전 향상을 위해 권고될 수 있는 손상관리강화 전략의 기본방향을 도출하고자 하였다. 손상사망 원인을 피해유형별로 살펴본 결과, ① 구미시의 3대 사망원인(교통사고·자살·낙상) 중 자살자가 차지하는 비중이 절대적으로 높은 것으로 나타났고, ② 구미시의 손상사망자 2명 중 1명은 스스로 목숨을 끊는 의도적 손상사망자 유형인 것을 알 수 있었으나, 다만, ③ 자살을 제외한 생활주변에서 발생하고 있는 비의도적 리스크(중독, 익사, 화재, 자전거 사고, 질식 등의 안전사고)에 대한 방지체계의 경우 구미시가 오히려 타 해외국가들에 비해 훨씬 앞선 역량을 갖춘 것으로 검토되었다. 이상의 구미시 사망손상문제에 대한 평가와 이해를 바탕으로 구미시의 손상사망 문제의 본질은 고위험 계층인 64세 이상 고령층의 사회안전망 부실에 있다는 결론이 도출됐다. 따라서 이 연구에서는 그 완충역할을 해줄 수 있는 고령친화 지원 프로그램의 구축 등 구미시가 국제안전도시로서의 경쟁력을 갖추기 위해 활성화돼야 할 지침을 제시하여 정책적 시사점을 도출하였다.

세 가지 다중 점 군 정합 방법 비교 분석에 대한 연구

김대운,고광희 한국CDE학회 2019 한국CDE학회 논문집 Vol.24 No.4

In this paper, three multi-view registration methods for point clouds, MAICP (Motion Averaging Iterative Closest Points), LUM with 6 DoF (Lu and Milios style SLAM with 6 DoF), and IOM (Improved Optimization-on-a-Manifold), are compared. For each method, three types of correspondence computation approaches: point-point, point-plane and point-curved surface, are implemented and the performance of the multi-view registration methods based on each correspondence computation type is analyzed and compared with real examples. To reduce the accumulative error caused by pairwise registration, multi-view registration should be applied. We also suggest which type of correspondence method, and the multi-view registration method should be applied to obtain the least error and registration time.

식물의 Ecdysteroids 함량에 미치는 광과 식물생장조절제의 영향

김대운,채현병,조문제,류기증,부경환,진성범,이도승 한국농화학회 2001 Applied Biological Chemistry (Appl Biol Chem) Vol.44 No.3

Effects of light, methyl jasmonate(MJ), 6-benzylaminopurine(BA), thidiazuron(TDZ), and 2,4-dichlorophenoxyacetic acid(2,4-D) on the contents of ecdysteroids (β-ecdysone+polypodine B) in Polypodium vulgare L. and Achyranthes japonica Nakai were studied. When the plants of P. vulgare were cultured under light control, the ecdysteroids contents in both leaves and rhizomes decreased with increasing light intensity. The ecdysteroids contents in A. japonica were also lower when cultured under light than under dark. Among the tested plant growth regulators, MJ, BA, and TDZ increased the ecdysteroids contents in both P. vulgare and A. japonica.

조준경안정화시스템의 인식과 제어

김대운,전순용 대한전자공학회 2007 電子工學會論文誌-SC (System and control) Vol.44 No.3

Sight Stabilization system is the control system to preserve Line of Sight for the targets though many nonlinear disturbances and vibrations are generated. In this paper, we identified Stabilization system using RLS algorithm, one of the system identification algorithm and found out the modeling of system. Considering nonlinear operational condition this paper proposes two Knowledge-base controllers - Fuzzy controller, Fuzzy PI Gain Scheduling controller, and simulates the performances of proposed controllers compare with Lead PI controller being used in Sight system of NFIV. 조준경이 장갑차 주행에 의한 진동 등을 포함한 온갖 비선형적인 외란이 가해지는 상황에서 표적에 대해 조준선을 유지하도록 제어하는 시스템이 조준경 안정화 시스템이다. 본 논문에서는 이 조준경 안정화 시스템에 대해 시스템 인식 알고리즘의 하나인 순환최소자승법을 이용하여 시스템 파라미터를 구하여 안정화 시스템을 인식하여 모델링하였으며 이렇게 구해진 모델을 제어하기 위해 지식기반제어기인 퍼지제어기 및 퍼지 PI이득조정 제어기를 설계하였다. 또한 비선형적인 잡음을 추가한 상황에서 현재 차기보병전투장갑차의 조준경 안정화 시스템의 제어기로 사용하고 있는 Lead PI제어기와 설계된 제어기의 성능을 비교하는 시뮬레이션을 수행하여 그 성능을 확인하였다.

고주파유도결합에 의해 여기된 물플라즈마로부터 수소생산에서 메탄가스 첨가효과

김대운,정용호,추원일,장수욱,이봉주,김영호,이승헌,권성구,Kim, Dae-Woon,Jung, Yong-Ho,Choo, Won-Il,Jang, Soo-Ouk,Lee, Bong-Ju,Kim, Young-Ho,Lee, Seung-Heun,Kwon, Sung-Ku 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.5

Hydrogen was produced from water plasma excited in high frequency (HF) inductively coupled tubular reactor. Mass spectrometry was used to monitor gas phase species at various process conditions, Water dissociation rate depend on the process parameters such as ICP power, $H_{2}O$ flow-rate and process pressure, Water dissociation percent in ICP reactor decrease with increase of chamber pressure, while increase with increase of ICP power and $H_{2}O$ flow rate. The effect of $CH_4$ gas addition to a water plasma on the hydrogen production has been studied in a HF ICP tubular reactor. The main roles of $CH_4$ additive gas in $H_{2}O$ plasma are to react with 0 radical for forming $CO_x$ and CHO and resulting additional $H_2$ production. Furthermore, $CH_4$ additives in $H_{2}O$ plasma is to suppress reverse-reaction by scavenging 0 radical. But, process optimization is needed because $CH_4$ addition has some negative effects such as cost increase and $CO_x$ emission.