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건물화재의 플래시오버 도달 시간에 영향을 미치는 인자들에 관한 연구
김형진(Hyeong-Jin Kim),데이비드 릴리(David G. Lilley),백병준(Byung Joon Baek),박복춘(Bockchoon Pak) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In structural fires, flashover is characterized by the rapid transition in fire behavior from localized burning<br/> of fuel to the involvement of all combustibles in the enclosure. An investigation of parameter effects on the<br/> time to reach flashover conditions in a typical single room fire is undertaken using a zone method (FAST) and<br/> Thomas method. Major parameters affecting the time to reach flashover are found to be fire growth rate,<br/> ventilation opening area and internal room surface. The results of the FAST and the Thomas Method give very<br/> similar results of the time to reach flashover..
김형진(Kim Hyung-Jin),김영석(Kim, Young-Suk),김상진(Kim, Sang-Jin),조중근(Cho, Jung-Geun),백기영(Baek, Ki-Young) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.2
본 연구의 목적은 행정중심도시 현상설계안들을 통해 최근에 적용된 다양한 주동 계획 요소들을 분석해 보는 것이다. 이러한 분석을 통해 우리나라 주거단지에 적용되고 있는 다양한 설계 기법과 최근의 설계 동향을 파악해 볼 수 있을 것이다. 왜냐하면 행정중심도시가 비교적 최근에 실시된 주거단지 현상 설계이며, 우리나라의 주요 설계사무소와 건설 회사들이 참 여하였기 때문이다. 연구 결과는 다음과 같다. : (1) 판상형 주동은 8가지 유형(ㄱ자형 주동이 가장 많이 적용됨)으로 탑상형 주동은 9가지 유형(일자형, L자형, ㅁ자형 주동이 가장 많이 적용됨)으로 분류되었다. (2) 코어 형태는 대응형이 6가지 유형으 로 병렬형이 3가지 유형으로 분류되었다. 두 유형 모두 필로티와 연계된 유형들이 가장 많이 적용된 것으로 나타났다. (3) 지붕 형식은 4가지 유형으로 구분되었는데, 평지붕이 전체 단지의 95%에서 적용된 것으로 나타났다. (4) 주동 매스 형식은 5가지 유형으로(일반형과 보이드형이 가장 많이 적용됨) 분류되었으며 입면 구성은 3가지 유형으로(수평분할형이 가장 많이 적용됨) 분류되었다.
김형진(Hyung-Jin Kim),윤희상(Hee-Sang Yun),정백호(Baek-Ho Jung) 호서대학교 공업기술연구소 2004 공업기술연구 논문집 Vol.23 No.1
In this paper, a new form ulation is presented for analyzing the transient electrom agnetic response from conducting w ire antennas using the tim e-dom ain integral equation (T D -IE ). Instead of the conventional m arching-on in tim e (M O T ) technique, the solution m ethod is based on the G alerk ins m ethod th at involves separate spatial and tem poral testing procedures. Piecew ise triangle basis functions have been used for spatial expansion and testing functions for arbitrarily shaped w ire structures. T he tim e-dom ain variation is approxim ated by a set of orthonorm al basis functions th at is derived from the Laguerre polynom ials. These basis functions are also used for tem poral testing. The m ethod presented in this paper results in very stable transient responses from w ire antennas. Representative num erical results are presented and com pared w ith the inverse discrete Fourier transform (ID F T ) of the frequency dom ain solution.
Portable XRF를 이용한 어린이 야외 놀이용품의 중금속 측정
김형진 ( Hyung Jin Kim ),백영만 ( Young Man Baek ),정경훈 ( Kyung Hoon Jung ),홍석연 ( Suk Youn Hong ),허화진 ( Hwa Jin Heo ),성진욱 ( Jin Uk Seong ),박제철 ( Je Chul Park ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.4
The present study was conducted to judge the applicability of field quality control by children`s goods manufacturers by assessing the contents of heavy metals such as Pb and Cd in outdoor play goods for children through measurement using Portable XRF and comparing the results through detailed analyses using ICP. Heavy metal contents of 711 part samples of 505 products were measured using XRF. According to the results, the ratio of products that exceeded the Pb and Cd content standards specified under the Quality Management and Safety Control of Industrial Products Act were 2.4% and 2.6%. Many products certified for self-regulated safety exceeded the standards and thus it was considered that harmful chemical material centered safety management systems would be necessary. Detailed ICP analyses of some products were compared and the results showed deviations of 0.9∼80.8% from XRF results. The reasons for this are deviations in the characteristics of measured cross sections and the homogeneity of samples resulting from sample preparation methods, etc. Therefore, it is considered that field quality control will be applicable if measuring methods are efficiently established based on product characteristics and calibration curve preparation methods are established through quality control.
권순영,김형진,조성동,백승국,정광윤,최건,최종욱,Kwon, Soon-Young,Kim, Hyung-Jin,Jo, Sung-Dong,Baek, Seung-Kuk,Jung, Kwang-Yoon,Choi, Geon,Choi, Jong-Ouck 대한기관식도과학회 2001 大韓氣管食道科學會誌 Vol.7 No.1
Background and Objectives: Adenoid cystic carcinoma (ACC) is an aggressive, often indolent tumor, with a high incidence of distant metastasis (DM). Relatively little has been written about the factor that influence distant spread and subsequent survival because it is uncommon and has protracted clinical course. We attempted to reemphasize the biologic behavior of ACC by investigating the relationship between the clinical features and prognosis. Materials and Methods : We have retrospectively studied 24 determinate patiens who received definitive treatment in our hospital between 1984 and 1995 for ACC in all salivary sites. Inclusion criteria were no prior treatment elsewhere other than excisional biopsy and eligibility for follow-up of at least 5 years. Variables assessed for their impact on distant metastasis included age, gender, size, node status, stage, histologic pattern, locoregional treatment failure. Results : Treatment failure occurred in a total of 16 of 24 determinate Patients (64%), 12 of whom had DM (50%). This was usually associated with locoregional recurrence (8 patients), but DM was the only indication of failure in 4 whose primary tumor was controlled. Of the 12 patients with known DM, the lung was recored as the only involved site in 7 Patients, lung was involved in addition to other sites in 1, bone and liver metastasis occurred in 2 respectively. Disease-free intervals varied from 3 month to 14 years (median 3 years). The only significant factors influencing survival were the size of the primary tumor, locoregional recurrence. Conclusion : The high incidence of DM with locoregional failure confirms the importance of aggressive initial surgery. combined with irradiation, for high-stage tumors or involved surgical margins. Large tumor size and locoregional recurrence, rather than microscopic appearance, were predictive of DM.
뮬러 적분방정식을 이용한 삼차원 유전체의 전자기 산란 해석
박재권,김형진,안종출,정백호,Park Jae-Kwon,Kim Hyung-Jin,An Chong-Chul,Jung Baek-Ho 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.10
본 논문에서는 임의 형상을 가지는 삼차원 유전체의 전자파 산란을 해석하기 위하여 모멘트법을 이용한 뮬러적분방정식의 새로운 해법을 제안한다. 매질이 균일한 유전체 표면을 평면 삼각형 패치로 모델링 하여, RWG (Rao, Wilton, Glisson)함수를 등가 전기 및 자기 전류밀도의 전개함수로 사용한다. 그리고 RWG 함수와 그 직교함수를 조합한 시험함수를 적용한다. 유전체구에 대하여 제안된 방법으로 계산된 수치 결과를 보이고 다른 공식에 의한 결과와도 비교한다. In this paper, we present a set of numerical schemes to solve the Muller integral equation for the analysis of electromagnetic scattering from arbitrarily shaped three-dimensional dielectric bodies by applying the method of moments(Mon. The piecewise homogeneous dielectric structure is approximated by planar triangular patches. A set of the RWG(Rao, Wilton, Glisson) functions is used for expansion of the equivalent electric and magnetic current densities and a combination of the RWG function and its orthogonal component is used for testing. Numerical results for a dielectric sphere are presented and compared with solutions obtained using other formulations.