IMT-2000의 다층셀 구조를 위한 시뮬레이션 모델에 관한 기초연구

박덕규 목원대학교 자연과학연구소 1998 自然科學 硏究論文集 Vol.7 No.-

본 연구에서는 'IMT-2000 무선망 시뮬레이터'구성을 위한 제반 파라미터, 핵심기술의 추출 및 성능평가를 위한 자료를 제시하여 IMT-2000구현을 위한 기반자료를 창출한고저 한다. 더욱이 IMT-2000의 무선망에서 구축되는 다층 셀구성의 효과적인 배치를 위하여, 기존의 채널할당 알고리즘과 핸드오버 알고리즘을 비교분석하여 IMT-2000시스템 실현을 위한 기초연구를 수행하였다. In this study, it is retrieved that the core contents and parameters to build a radio-simulator of IMT-2000. In addition, fundamental data to evaluate the performance of the simulator are generated. In order to obtain the effective placement of Multi-layer Cell, this paper also compared the characteristics of algorithms for distributed dynamic channel assignment strategies. The results from this process must be important background for the sake of realization of IMT-2000 in the near future.

우측 귓바퀴 뒷면에 발생한 혈관평활근종 1예

박수정,송현정,김주용,김창덕,김창욱,이규석 대한피부과학회 2006 大韓皮膚科學會誌 Vol.44 No.4

과학전 출품작과 현장학습의 연계성에 관한 연구

박행신,오덕철,김원택,김규용,현진오,정충덕 濟州大學校 師範大學 科學敎育硏究所 1987 科學敎育 Vol.4 No.-

In this paper, we report some sorts of result obtained by investigating the exhibits which had been submitted for "The National Exhibition of Science"and "The Science Exhibition for the Students of Cheju-do"during the last ten years and by putting the questions to the science teacher of the teacher of the middle and high schools in Cheju-do. Up to the half number the exhibits are occupied by the field of physics and biology. Almost the exhibits (above 90%) have the contents related to those of the current curriculum. However, 30.2% of the respondents only believe that their students may put the exhibits to practical use in learning. Many respondents replied that they could have not participated in the exhibition of science because they were in heavy duty and the fiscal support were not only so limited but also not sufficient enough to make an excellent work.

생체신호 처리용 지능형 ASIC 칩 개발

박차훈,최덕규,김태선 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(A)

The proposed enhanced telemetry IC is verified with Altera FPGA chip (EPF10K20RC240-4) and layout with 0.6㎛ CMOS n-well process technology. For the VLSI design, a high level language was used, decreasing layout time by a factor of four. They resulting design, performed with a combination of Synopsys behavioral and structural code. The digital simulator used was VHDL logic simulator running under MaxplusⅡ.

차세대 이동통신시스템에서의 채널할당 알고리즘 및 시뮬레이터 개발에 관한 연구

박덕규 목원대학교 자연과학연구소 1999 自然科學 硏究論文集 Vol.8 No.-

최근에 국내에서 이동통신 서비스에 관한 수요가 폭발적으로 증가하고 있다. 이와 함께 차세대 이동통신(IMT-2000)에서 성능평가를 위한 시뮬레이터의 제작 및 표준화에 대한 요구가 대두되고 있으며, 국가적인 계획으로 차세대 이동통신에 대한 핵심기술을 얻기 위하여 많은 노력을 기울이고 있다. 본 논문에서는 차세대 이동통신의 실현을 위하여 가장 중요한 역할을 차지하는 시뮬레이터의 제작, 필요한 파라메터의 추출 및 채널할당 알고리즘에 대한 기초 연구를 수행하였다. In recent years, the demands of mobile communication services habe been explosively increasing in our country. On the other hand, IMT-2000 is expected to be a standard mobile service and a simulator development for performance analyses. Therefore, we should offer a great deal of efforts to attain the core technology of IMT-2000 as a national strategic plan. At this point of time, this paper including simulator development, parameter reterival, and performance analyses plays one of the most important roles for realization of IMT-2000 in the near future.

LCD의 회색 준위 상관 색온도 보정

최덕규,박차훈,김태선 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(B)

At the present time, the LCD (liquid crystal display) not only emitsless radiation and consumes less power, it also takes up less space allowing for a more comfortable work environment. This paper looks into characteristics of LCD's CCT. We propose the LUT (look-up table) which adjust the three primary colors'digital input value, for maintaining the fixed value of correlated color temperature. LCD's CCT is maintaining about 6500 K, which is the standard CCT of display systems. Moreover it is the same as the former LCD's luminance that LCD's with using the LUT. In addition, we confirm that the color reproducibility of LCD using the proposed LUT become much accurate than a conventional LCD.

허혈성 심질환에서 염증지표에 관한 연구

번정득,권영주,박상호,한대희,이상철,강진환,김명구,심규혁,최병조,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background : Atherosclerosis is the chief underlying cause of ischemic heart disease and there is increasing evidence that inflammation is an important determinant of the development of atherosclerosis. We assessed the levels of inflammatory markers in patients with ischemic heart disease and normal group who has normal coronary angiograms. Materials and Methods : Coronary angiography was performed in 142 patients. 107 patients of ischemic heart disease(stable angina pectoris 58, unstable angina pectoris 30, Acute myocardial infarction 19) and 38 normal control subjects. We assessed the level of inflammatory markers, such as CRP, ESR, fibrinogen and leukocyte. Results : CRP, ESR and fibrinogen values of the patients with stable angina pectoris and unstable angina pectoris were higher than that of normal control group, but there were no statistical significance. Leukocyte value of the patients with unstable angina pectoris(9003.3±701.5/mm^(3)) was significantly higher than that of the patients with stable angina pectoris(6685.5±245.8/mm^(3)) and normal control subjects(6394.3±235.1/mm^(3)). CRP, ESR and fibrinogen values of the patients with acute myocardial infarction were also higher than that of normal control subjects. CRP was 3.88±2.05 mg/dL in acute mocardial infarction group, and 0.29±0.15 mg/dL in normal control subject group(p<0.05). Fibrinogen was 541.6±45.1 mg/dL in acute myocardial infarction group, 321.4±25.6 mg/dL in normal control subject group(p<0.05). Leukocyte was 10942.1±737.6/mm^(3) in acute myocardial infarction group, 6394.3±235.1/mm^(3) in normal control subject group(p<0.05). Conclusions : This study demonstrate that CRP, fibrinogen and leukocyte values of acute myocardial infarction group were significantly higher than that of control group and stable, unstable argina pectoris group. Leucokyte values were significantly elevated in unstable angina group, but CRP values were not in unstable angina group.

염소 저장탱크의 가스누출 예측 및 제어를 위한 스크리닝 방법론

송덕만,박종규 울산대학교 1998 공학연구논문집 Vol.29 No.2

본 연구는 화학장치설비 중 염소 저장탱크의 누출유형에 따른 누출물의 물성자료들을 포함하는 누출원모델, 분산모델, 기상 및 지형자료들을 TSCREEN 모델에 입력시켜 염소 가스의 풍하거리에 따른 1시간 평균 최대 지표면 농도를 산출함으로써 유해독성가스의 누출 예측 및 제어를 위한 스크리닝 방법론을 개발하기 위한 것이다. 본 스크리닝 방법론에서는 저장탱크 및 압력방출장치로부터 누출되는 기상 및 2상 흐름의 연속 및 순간 누출에 대한 대기분산 모델링 절차가 고려되었다. 연구결과로부터, 공기보다 무거운 가스의 분산유형은 누출물의 상태(기상 및 2상 흐름), 누출 조건(온도, 압력), 누출물의 물리·화학적 특성, 누출유형(연속 및 순간누출)에 영향을 받고 있으며, 특히 누출물의 초기(감압) 밀도 및 누출속도 뿐만 아니라 풍속 및 대기안정도에 커다란 영향을 받고 있음을 알 수 있었다. 결론적으로, 지표면 농도는 풍속이 낮을수록 대기안정도가 안정할수록 증가하고 있음을 알 수 있었다. 본 스크리닝 방법론은 보다 다종다양한 시나리오들을 선정하여 보편적으로 적용할 수 있는 Sliding Scale 방법론을 개발함으로써 정교한 해석 모델의 적용시 예비 가이드라인으로 활용될 수 있으리라 사료된다. This study was performed to develop the screening methodology for prediction and control of hazardous/toxic gas releases by estimating the 1-hr average maximum ground-level concentration of Cl₂gas vs. downwind distance by incorporating source term model including the general/physical properties of released material and release mode of the Cl₂storage tank of the chemical plant facilities, dispersion model, and meteorological/topographical data into the TSCREEN model. For this screening modeling, dispersion modeling procedures for continuous and instantaneous releases of the gas phase and two-phase flow from the storage tank and pressure relief valve were considered. As the results of the study, it was found that dispersion modes of the dense gas were affected by the state of the released material(gas phase, two-phase flow), the released conditions(temperature, pressure), physical-chemical properties of released material, and the the released modes(continuous and instantaneous releases), and especially largely affected by initial(depressurized) density of the released material and release emission rate as well as the wind velocity and the atmospheirc stability. Consequently, it was found that the maximum ground-level concentration increases as the wind speed is low and the atmospheric stability is stable. It was thought that this screening methodology can be useful as a preliminary guideline for application of the refined analysis model by developing the generic sliding scale methodology for various senarios selected.

SMD 자동화 공정의 부품 혼입 방지 시스템

최덕규,박차훈,김태선 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(B)

SMD (surface Mount Device : Print된 기판에 부품을 장착)공정은 완전 자동화 시스템이며, 이 작업을 진행하기 위하여 백 수 십여 가지의 부품을 정해진 부품 카트리지에 삽입한 후 자동화 설비는 그에 맞는 부품을 장착하게 된다. 그러나 부품을 카트리지에 삽입하는 작업을 작업자가 하게 되는데 이는 사람이 하는 일이라 Human Error가 발생할 가능성이 높다. 본 논문에서는 Chip Mounter에 센서를 부착하여 카트리지의 탈착 여부를 실시간으로 감시하는 모니터링 시스템과 부품 카트리지에 표시된 정보를 Bar-code Reader로 판독하게 함으로서 SMD Chip 장착 자동화 공정의 부품 혼입 방지 시스템을 개발하였다. 개발한 장비를 현장에 투입, 실 생산활동에 활용하게 하여 해당기업의 생산성 향상에 크게 기여하고 있다.

階層別 住居基準 設定에 關한 硏究

吳德成,朴贊圭 충남대학교 공업교육연구소 1984 論文集 Vol.7 No.1

Until now, most of the studies on the housing problems have been dealed with their quantities. But radical growth of urban living level owing to economic, social and technical developments makes changes in the basic concepts of living .So the studies on the qualities of housing have come to be required. The aim of this study is to establish the standards for dwelling unit area according to family types, and further to help future planning of housing. In the process of the study, the authors divided families into 5 types, and established the standards of dwelling unit area by measuring the sizes of each rooms in existing dwelling units and by designing normal sizes of each rooms with the modularc oordination system on the basis of arrange-ment of furnitures, and compared the results with foreign standards.(Japan',FHA,IFHA, England).