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

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.

Fluorogenic Patterning Based on Fluorescence Quenching of $\pi$-Conjugated Polymers: Fluorescence Patterning on Films and on Flexible Electrospun Fibrous Mats

김형준,이정효,곽찬규,손원근,박원호,이택승,Kim, Hyung-Jun,Lee, Jung-Hyo,Kwak, Chan-Kyu,Son, Won-Keun,Park, Won-Ho,Lee, Taek-Seung The Korean Fiber Society 2006 한국섬유공학회지 Vol.43 No.5

Four copolymers of 9,9-dihexylfluorene and benzothiadiazole derivatives with or without quinoxaline were newly synthesized via Suzuki coupling reaction and characterized. The conjugated polymers with benzothiadiazole moiety in the main chain emitted green fluorescence, while their reduced polymers showed blue emission due to perturbation in the donor-acceptor structure. The polymers were spin-cast into thin films in the presence or absence of photoacid generator and well-defined fluorescence patterns were fabricated on the films by simple UV irradiation. The polymer was electrospun with poly(methyl methacrylate) to produce flexible fibrous mats. Fluorescence patterning was also conducted onto the electrospun fiber web to obtain a stable and flexible pattern without bending damage.

Torulopsis bombicola 에 의해 생산된 생계면활성제의 특성에 관한 연구

김형준,류정용,박돈희 ( Hyung Jun Kim,Jeong Yong Ryu,Don Hee Park ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2

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.

연구논문 - 에너지 , 환경분과 : 다공성 합성수지 흡착제내의 피리딘류의 확산

김형준,박성은,이성식,손진언,에이지후루야 ( Hyung Jun Kim,Sung Eun Park,Sung Sik Lee,Jin Eon Sohn,Eiji Furuya ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1994 No.1

말기암환자에서 혈청 비타민 C 농도와 연관된 인자들

김형준,황인철,염창환,안홍엽,최윤선,이재준,임수혁,Kim, Hyung Jun,Hwang, In Cheol,Yeom, Chang Hwan,Ahn, Hong Yup,Choi, Youn Seon,Lee, Jae Jun,Lim, Su Hyuk 한국호스피스완화의료학회 2014 한국호스피스.완화의료학회지 Vol.17 No.4

목적: 혈청 비타민 C 수치는 체내 항산화상태를 나타내는 지표로서, 암환자에서는 정상인에 비해 감소되어 있다. 하지만, 이 지표가 말기암환자에서 어느 정도 감소되어 있고, 그 감소에 어떤 요인들이 관련되는지에 대한 연구는 매우 드물다. 방법: 두 개 기관의 완화의료병동에 입원했던 암환자 65명을 대상으로 하였다. 환자의 나이, 성별, 암의 종류, 기능상태, 임상증상, 완치 목적의 암 치료력, 그리고 혈청 비타민 C를 포함한 혈액검사 자료를 수집하였다. 혈청 비타민 C 수치의 사분위수를 기준으로 두 군(3사분위수 이하 vs. 4 사분위수)으로 분류한 후 각 군의 차이를 비교하였고, 단계적 다중 로지스틱 회귀분석을 통해 혈청 비타민 C 수치와 관련된 인자를 확인하였다. 결과: 대상자의 혈청 비타민 C의 평균은 $0.44{\mu}g/mL$이었으며, 대상자 전체가 비타민 C 결핍에 해당되었다. 단변량 분석에서는, 비폐암 환자이거나(P=0.041) 발열이 있는 환자(P=0.034)에서 낮은 혈청 비타민 C 수치를 보였다. 폐암, 발열, 삼킴곤란, 호흡곤란, C 반응단백, 그리고 항암화학요법 등의 잠재적인 인자들을 보정한 다변량 분석에서, 낮은 혈청 비타민 C 수치를 나타낼 가능성은 항암화학요법을 받은 군에서 그렇지 않은 군에 비해 3.7배 높았고(P=0.046), 발열이 있는 군에서 그렇지 않은 군에 비해 7.22배 높았다(P=0.020). 결론: 말기암환자에서 비타민 C 부족은 매우 심각하였고, 항암화학요법 치료력과 발열이 관련 있었다. Purpose: Serum vitamin C is one of the indicators for antioxidant levels in the body and it is lower in cancer patients compared with the healthy population. However, there have been few studies on the levels of serum vitamin C in terminally ill cancer patients and related factors. Methods: We followed 65 terminal cancer patients who were hospitalized in two palliative care units. We collected data of age, sex, cancer type, functional status, clinical symptoms, history of cancer therapy, and various laboratory findings including serum vitamin C level. Patients were categorized into two groups according to the quartile of serum vitamin C level (Q1-3 vs. Q4), which were compared each other. Stepwise multiple logistic regression analysis was used to identify factors related to serum vitamin C levels. Results: The mean serum vitamin C level was $0.44{\mu}g/mL$, and all patients fell into the category of vitamin C deficiency. Univariate analysis showed that The serum vitamin C level was lower in non-lung cancer patients (P=0.041) and febrile patients (P=0.034). Multivariate analysis adjusted for potential confounders such as lung cancer, fever, dysphagia, dyspnea, C reactive protein, and history of chemotherapy demonstrated that odds for low serum vitamin C level was 3.7 for patients receiving chemotherapy (P=0.046) and 7.22 for febrile patients (P=0.02). Conclusion: Vitamin C deficiency was very severe in terminally ill cancer patients, and it was associated with history of chemotherapy and fever.

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.

강변저류지에 의한 홍수저감 효과 분석을 위한 수리실험

김형준,배덕원,윤광석,Kim,Hyung-Jun,Bae,Deok-Won,Yoon,Kwang-Seok 한국방재학회 2011 한국방재학회논문집 Vol.11 No.6

강변저류지는 홍수저감효과 뿐만 아니라 생태적인 목적으로도 활용이 가능하여 최근 강변저류지 설치에 관한 연구가 활발히 진행되고 있는 상황이다. 그러나, 강변저류지 설치에 따른 홍수저감효과는 기존에 개발된 수치모형에 의존하고 있으며, 수리모형을 통한 기초연구가 부족한 상황이다. 본 연구에서는 강변저류지의 홍수저감효과를 분석하기 위하여 부정류 수리실험을 수행하였다. 강변저류지 설계시 고려인자인 설치위치, 유입부 마루높이 및 강변저류지 면적 등을 수리실험에서 다양한 조건으로 반영하여 수리실험을 수행하였다. 강변저류지의 홍수저감효과는 설치위치가 가까운 경우 가장 효과가 클 것으로 판단되며, 월류부 마루높이는 최대한 낮게 설치하는 것이 홍수저감에 효과적인 것으로 나타났다. 강변저류지 면적이 커질수록 홍수저감효과 또한 증가하지만, 기대할 수 있는 최대저감효과는 한계값에 수렴할 것으로 판단된다. 본 연구를 통하여 관측되고 분석된 결과는 강변저류지 설계시 유용하게 활용될 수 있을 것으로 판단된다. Detention basin is highly effective hydraulic structure which is available for flood mitigation and ecological characteristics. However, analysis of flood mitigation by detention basin is performed with numerical approaches only, there is not enough data obtained by experimental observation. In this study, physical experiment were performed under unsteady flow condition to analyze flood mitigation with detention basin. Various design factors such as location, later weir height and extent of detention basin were considered in this experimental observations. As the distance from detention base to target location become closer and later weir height become higher, we can expect more effective flood mitigation. As the area of detention basin area become lager, we also expect more higher flood mitigation effects. But, the flood mitigation effects from detention basin would converged to critical value. The obtained data will be useful for following studies about detention basin.