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Wideband Swtiching System의 Pathsearching 방법에 관한 연구
김성범,Kim, Seong-Beom 한국전자통신연구원 1983 전자통신 Vol.5 No.1
전자교환기의 통화로부분에서 free인 통화로를 선택 접속시켜주는 방법은 통화로의 구성과 기능에 따라 달라진다. 본 논문에서는 일반 전화뿐만 아니라 TV전화, 데이타전송, 비데오텍스(Videotex),스테레오방송 등을 교환 접속시켜 주는 광대역용 전자교환기(Wideband switching system)의 교환접속망(Switching matrix)을 효과적으로 구성하여 통화로 선택이 전교환접속망에 걸쳐 고루 분포될 수 있는 방법을 제안하였다. 그리고 그에 따른 pathsearching simulation program을 작성하여 실예를들어 설명함으로써 본 논문에서 제안한 통화노선택방법의 유용성을 보였다. The pathsearching method in switchingmatrix of an electronic switching system depends upon the structure and function of the system. In this paper, an efficient way to construct the switching matrix and a pathsearching method under the full distributed traffic theory in an wideband switching system, which can control not only normal telephone call, but also TV telephone, data communication, videotex and sound, is proposed. And the effectiveness of the method is shown through an example of the pathsearching simulation program.
김성범,Kim, Seong-Beom 한국화재보험협회 2007 防災와 保險 Vol.122 No.-
BP 텍사스 시티의 석유정제소의 화재폭발은 2005년에 가장 많은 인명의 손실을 끼친 유동화자산의 화재폭발사고로서 15인의 생명을 앗아가고 200여 명의 사람을 다치게 하였다. 트럭 한 대의 역화(내연기관의 부정폭발)에서 시작된 점화원은 이성질체화시스템(ISOM) 대기암 통기구에서의 가연성 탄화수소 액체와 증발 기체를 발화시켰다. 화학안전위원회는 그 사고를 조사 및 검토한 후 BP사가 모든 면에서 기계적인 결함과 함께 안전성이 불완전하였음을 발견하였다. 본 고는 저자들이 미국화학안전위험조사위원회에 제출한 이들의 조사보고서를 번역 게재한 것이다.
김성범,심성용,김경준,남혜정,Kim, Seong-beom,Sim, Sung-yong,Kim, Kyung-jun,Nam, Hye-jeong 대한한방안이비인후피부과학회 2003 한방안이비인후피부과학회지 Vol.16 No.1
Vertigo is one of the common symptoms that we can see often clinically. It is hallucination to motion of oneself or surroundings. Vertigo include not only simple whirling sensation but also leaning or falling down sensation. Particularly in benign paroxysmal positional vertigo(BPPV), the principal symptom is dizziness and accompanied by nausea, lightheadness, vomiting. They are induced by positional change which like shake ones head or lay down or turn over in one' s sleep. Cause of BPPV is otoconium fragments which are released from inner ear and stimulate ampulla of semicircular canal. So in treatment BPPV, we often using the Dix-hallpike maneuver that realignment otoconium fragments. A case of vertigo patient suggested BPPV who is diagnosed oriental medically as weakly dizziness showed prominent improvement by medicate Bojungikgi-tang and operate otoconium-realignmentation (improved Dix-hallpike maneuver) maneuver so we reported.
응력파 기반 표면파기법 및 충격반향기법을 이용한 콘크리트 구조물의 압축강도 및 결함 추정에 관한 연구
김성범(Kim Seong-Beom),홍성욱(Hong Seong-Uk),조영상(Cho Young-Sang) 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.10
As infrastructures are being deteriorated, non-destructive evaluation of existing structures and construction quality control are increasingly demanded in the construction industry. This research is focused on predicting concrete compressive strength and flaw detection of concrete slab using Impact Echo (IE) method and Spectral Analysis of Surface Wave(SASW) method, which are one of the Non-destructive Test (NDT) methods. The method for predicting the strength and the position of rebars of reinforced concrete slabs and detecting void of reinforced concrete slab are derived from the relationship between compressive strength and stress wave velocity. Furthermore, the evaluation of reliability is performed by applying the NDT methods to reinforced concrete structures through mock-up test. Predicting compressive strength based on stress wave velocity leads to the results of error 12 % in compressive wave velocity and 4.2 % in surface wave velocity. Detecting flaws of concrete using IE method leads to the result of an average error within 3 %.
Multiple Laser Beam Absorption에 유기된 Thermal Crack을 이용한 유리 절단에 관한 연구
김성범(Seong-Beom Kim),변철웅(Cheolwoong Byun),양민양(Min-Yang Yang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
Traditional glass cutting method uses diamond wheel to scribe the surface of glass. But scribing cutting method has many problems. Scribing Process makes Chips and particles and these unexpected things affect the quality of glass. Contrary to scribing method, laser glass cutting method has many advantages. Several kinds of laser are used in glass cutting. In this paper laser, glass cutting by Multiple Laser Beam Absorption using Yb:YAG Laser is analyzed after nondimensionalization of all variables and simulated using FEM. Laser power absorptivity of glass is obtained by comparison between measured temperature and temperature calculated using FEM. Stress-intensity factor is calculated using multiple layer thickness averaged method from results of three dimensional thermal-stress FEM. Finally optimal normalized heat flux is obtained and this matched well with the glass cutting experiment.
창호의 성능인증 규격 기준과 면적 변화에 따른 에너지성능 비교분석
김성범(Kim Seong-Beom),이수열(Lee Su-Yeul),김동윤(Kim Dong-Yoon),최원기(Choi Won-Ki) 한국태양에너지학회 2020 한국태양에너지학회 논문집 Vol.40 No.1
This study reviewed selected specific windows and reviewed the window performance certification criteria including KS F 2278 and KS L 9107 and analyzed the change in performance based on the change of area. This study also compared the heating and cooling loads of an apartment house applied with window performance reviewed in consideration of insulation and SHGC performance and actual size based on KS F 2278. The analyzed window was a double window composed of aluminum and PVC and the building was the apartment house model of 141 m². The analysis results were as follows. First, as the window glass’s thermal performance is superior to frame, the performance degraded in reduced area. In case of selected window, the 1 m X 1m window’s thermal performance and SHGC decreased by 35% and 37% respectively compared to 2 m X 2 m window. Secondly, in the comparison of performance for increasing area with 2 m X 2 m and 3 m X 3 m windows, the 3 m X 3 m window’s thermal performance and SHCG increased about 14%. Third, in the comparison of heating and cooling loads of the analyzed model considering the apartment house model applied with window performance derived from KS F 2278 and actual figures, the model’s total heating and cooling loads increased by 33% with cooling decreasing by 36% and heating increasing by 77%. Above analysis results show that evaluation of window performance based on criteria such as KS F 2278 and KS L 9107 may lead to distortion of performances different from actual products. Thus, it is necessary to suggest new evaluation criteria.