인공지능 기반 가상 비서의 BIM 설계 적용에 관한 기초연구

김형준(Kim, Hyung?Jun),전한종(Jun, Han-Jong) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.1

In this research, in order to solve the problem of degradation of business efficiency of building design utilizing BIM, a process was constructed using virtual assistant based on artificial intelligence technology. In the constructed process, the designer can learn the command customized to the virtual assistant applied to the BIM architecture design work, using the A-BIM algorithm. These A-BIM algorithms are utilized in the form of artificial intelligence algorithms built in the understanding structure of the designer. As a result, it is expected that the efficiency of operations can be improved by fusing the conventional artificial intelligence technology and the A-BIM algorithm, rather than developing artificial intelligence to be applied to the field of BIM architectural design.

스펙트럼 도메인 빛간섭단층촬영에서 발생하는 오류

김형준,정혜원,김형찬,Hyung Jun Kim,Hyewon Chung,Hyung Chan Kim 대한안과학회 2011 대한안과학회지 Vol.52 No.8

Purpose: To report frequencies of image artifacts associated with spectral-domain optical coherence tomography (SD-OCT) and to evaluate the impact of artifacts on foveal thickness measurements. Methods: This retrospective study included 267 eyes of 267 patients who underwent OCT volume scanning using Spectralis HRA+OCT (Heidelberg Engineering, Heidelberg, Germany). Macular volume scans of normal and diseased eyes were systematically evaluated for image artifacts within each scan overall and within the center 1-mm area. The frequency of each artifact type was compared for scans stratified by diagnosis category. Results: Among the volume scans, 79.4% had at least 1 artifact overall, and 26.6% had at least 1 artifact in the center 1-mm area. The highest percentage of inner retina misidentification occurred in the epiretinal membrane (36.1%), whereas the highest percentage of outer retina misidentification occurred in neovascular age-related macular degeneration (wet AMD, 40.0%). Clinically significant artifacts involving the center 1-mm area were observed in 6.4% of volume scans and were most common in wet AMD (43.3%). Conclusions: Image artifacts in SD-OCT volume scanning are common, but relatively less common in the center 1-mm area of scans. Clinicians should carefully review scans for artifacts when using SD-OCT images and retinal thickness measurements because clinically significant artifacts may affect retinal thickness measurements. J Korean Ophthalmol Soc 2011;52(8):943-951

지역정체성 확립요인과 지역이미지 제고와의 관련성 연구 -'2016 가야체험축제'를 중심으로-

김형준,Kim, Hyung-Jun 대한안전경영과학회 2017 대한안전경영과학회지 Vol.19 No.2

The purpose of this study is to consider the relation between the deciding factors of local identity and local image improvement. To achieve this purpose, the deciding factors of local identity have been set as the following four: historical identity, cultural identity, (nature) scenery identity, and industrial identity. The writer has established a model to represent the relation between these factors and the local image improvement, namely 'Visitor Satisfaction' and 'Revisit Intentions', and framed a hypothesis for empirical verification. The study results are as follows: First, the deciding factors of local identity which this study addressed are empirically proven to have a significant effect on the visitor satisfaction and the intention to revisit in which is it likely that the greater the impact of the deciding factors, the higher the visitor satisfaction and revisit intentions would be. Second, the deciding factors of local identity, it appears that the 'historical identity' factor had the largest impact on the visitor satisfaction, and the 'cultural identity' factor had the largest impact on the revisit intentions. Therefore, of the four deciding factors, the 'historical identity' should be considered the highest priority to increase the visitor satisfaction, and the 'cultural identity' should be considered the highest priority to increase the revisit intentions. Third, based on the verification of the relation between the visitor satisfaction and revisit intentions, it can be presumed that the greater the visitor satisfaction, the higher the revisit intentions would be.

진당원(珍糖元)의 고혈당 조절 작용 및 기전에 관한 연구

김형준,윤철호,정지천,Kim, Hyung-Jun,Yoon, Cheol-Ho,Jeong, Ji-Cheon 대한한방내과학회 2004 大韓韓方內科學會誌 Vol.25 No.2

Objective : Diabetes is a disease in which the body does not produce or properly use insulin. Etiological studies of diabetes and its complications showed that oxidative stress might playa major role. Therefore, many efforts have been made to regulate oxygen free radicals for treating diabetes and its complications. Because Jindangwon has been known to be effective in treatment of diabetes, the methanol extract of Jindangwon was tested for its effectiveness in reducing the oxidative stress induced by Streptozotocin. Methods : Jindangwon was washed, dried in the shade and crushed. The crushed Jindangwon was extracted 3 times, each time with 3 volumes of methyl alcohol at $60^{\circ}C$ for 24 hours. The extract was filtered and evaporated under reduced pressure using a rotary evaporator to yield 30.6 g. Jindangwon extract was oral-administered to the diabetic rats induced by streptozotocin 50 mg per 1 kg of body weight for 15 days. The efficacy of the Jindangwon extract was examined with regard to the enzymatic pathways involved in the oxygen free radical production and the glutathione balance. Results : he effects of the methanol extract of Jindangwon in streptozotocin-induced diabetics rats with regard to body weight, blood glucose level, hepatic lipid peroxide level, hepatic xanthine oxidase activity and type conversion rate, hepatic glutathione level, hepatic glutathione peroxidase activity, hepatic glutathione reductase activity, hepatic aldose reductase activity, and hepatic sorbitol dehydrogenase activity were favorable enough to suggest that it is a cure for diabetes and its complications. Conclusions :These results support Jindangwon as an effective reducing agent for oxidative stress in the tissues and organs by regulating the production of oxygen free radicals. Jindangwon, in particular, shows promising results for its use as a cure, or preventative medicine for diabetes and its complications by reducing oxidative stress in beta-cells of the pancreas.

분할격자체계를 이용한 천수흐름 수치모형의 개발

김형준,이승오,조용식,Kim, Hyung-Jun,Lee, Seung-Oh,Cho, Yong-Sik 한국방재학회 2008 한국방재학회논문집 Vol.8 No.4

본 연구는 Cartesian 격자망을 기본으로 하여 복잡한 지형을 위한 격자를 간편하고 효율적으로 생성할 수 있는 기법인 분할격자체계를 제안하고자 한다. 분할격자기법은 전반적인 흐름영역의 격자는 균일한 크기의 Cartesian 격자로 표현하지만 수치모형의 정확성, 적용성 및 효율성을 증대시키기 위하여 흐름의 특성이 변하는 격자를 분할하여 처리하는 기법이다. 분할격자체계에 의한 격자망은 다양한 크기 및 형상을 지니게 되므로, 유한체적기법을 적용하여 복잡한 흐름영역을 위한 수치모형을 구성한다. HLLC Riemann 근사해법을 이용하여 지배방정식을 이산화하였으며, 수치해의 안정성을 기하기 위하여 TVD-WAF기법을 적용하였다. 분할격자체계를 이용한 수치모형을 검증하기 위하여 해석해가 존재하는 사각형수조의 자유진동흐름을 모의하였다. 해석해와 수치모의 결과를 비교하여 본 연구에서 제안된 기법이 균일격자 및 분할격자체계에서 자유수면변위 및 x-축 및 y-축 방향의 유속을 정확히 모의함을 확인하였다. Numerical implementation with a Cartesian cut-cell method is conducted in this study. A Cartesian cut-cell method is an easy and efficient mesh generation methodology for complex geometries. In this method, a background Cartesian grid is employed for most of computational domain and a cut-cell grid is applied for the peculiar grids where the flow characteristics are changed such as solid boundary to enhance the accuracy, applicability and efficiency. Accurate representation of complex geometries can be obtained by using the cut-cell method. The cut-cell grids are constructed with irregular meshes which have various shape and size. Therefore, the finite volume method is applied to numerical discretization on a irregular domain. The HLLC approximate Riemann solver, a Godunov-type finite volume method, is employed to discretize the advection terms in the governing equations. The weighted average flux method applied on the Cartesian cut cell grid for stabilization of the numerical results. To validate the numerical model using the Cartesian cut-cell grids, the model is applied to the rectangular tank problem of which the exact solutions exist. As a comparison of numerical results with the analytical solutions, the numerical scheme well represents flow characteristics such as free surface elevation and velocities in x-and y-directions in a rectangular tank with the Cartesian and cut-cell grids.

팬터그래프-전차선로 접촉부 영상처리 기술 개발

김형준,박영,조용현,조철진,김인철,Kim, Hyung-Jun,Park, Young,Cho, Yong-Hyeon,Cho, Chul-Jin,Kim, In-Chol 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.12

The measurement of dynamic stagger in electric railways is one of the key test parameters to increase speed and maintain safety in electric railways. This paper is introduces a non-contact optical-based measuring instrument of a catenary system in electric railways. The instrument is implemented by utilizing a CCD (Charge Coupled Device) camera installed on the roof of a vehicle for vision acquisition and image processing techniques including the Canny edge detector and the Hough transform to detect contact wires and calculate dynamic stagger. To check the validity of our approach for the intended application, we measured stagger of a overhead wire of a Korea Tilting Train (TTX). The non-contact optical-based measurement system proposed in this paper performs real-time stagger measurement of an activated high-voltage contact wire. By results of this paper, the instrument should be applied to assess performance and reliability of newly developed electric railway vehicles.

파이로테크닉 고섬광 발생장치 조성설계 및 설계검증

김형준,최성욱,권미라,황준식,장쾌현,Kim, Hyung Jun,Choi, Sung Wook,Kwon, Mi Ra,Hwang, Jun Sik,Chang, Kwe Hyun 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.3

The composition of bright flash device is a pyrotechnic mixture consisting of metal powder, oxidizer and additives. A pyrotechnic mixture of bright flash device generates a bright flash through burning after being ignited by initiator. The function of bright flash is to distract or incapacitate electro optical sensor systems and enemy eyes temporally. This study is to develop composition of pyrotechnic mixture of bright flash and to analyze the test results by considering intensity and efficiency of light.

진공 하에서 전기방사된 부직포의 특성에 대한 연구

김형준,정윤호,길명섭,김학용,방호주,Kim Hyung-jun,Jung Yoon-ho,Khil Myung-seob,Kim Hak-yong,Bang Ho-Ju 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.6

The exploitation of technologies based on electro spinning have been limited due to poor understanding of the process and consequent limitation in process control, productivity and reproducibility. To control the effect of the environmental parameter, which is one of important electro spinning parameters, the vacuum process was introduced because the magnitude of electric field in vacuum is not limited by the low dielectric breakdown strength of air. For this study, PCL dissolved in a mixture of N,N-dimethylformamide (DMF) and methylene chloride (MC) was electrospun as a form of nonwoven mats consisting of nano-sized fibers under vacuum and they have been analyzed using SEM and DSC. The PCL nonwoven mats via electrospinning under vacuum showed the characteristic spinning behavior observed at atmospheric pressure. In addition, results obtained from tensile test showed that PCL nonwoven mats via electro­spinning under vacuum have better mechanical properties than those prepared at atmospheric pressure.

수치해석을 이용한 항만의 해수교환율 산정

김형준,강규영,조용식,Kim. Hyung-Jun,Kang. Gyu-Young,Cho. Yong-Sik 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1

Numerical Analysis for exchanging seawater experiment is carried out in Do-Jang fish port. The change of tidal velocity and water level is derived by the two-dimensional nonlinear shallow-water numerical model. To calculate exchange rate of seawater with the change of tidal velocity and water level, a two-dimensional numerical model is employed which governing equations are Fokker-Plank equations. The calculated exchange rates of each time are described in tables and figures.

자동차부품 적용 저온분사 코팅기술

김형준,Kim, Hyung-Jun 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.1