http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Heekwan Lee,Hazim B. Awbi 한국대기환경학회 2007 한국대기환경학회지 Vol.23 No.E2
The introduction of tracer gas techniques to ventilation studies in indoor environments provides valuable information that used to be unattainable from conventional testing environments. Data acquisition systems (DASs) containing analogue-to-digital (A/D) converters are usually used to function the key role that records signals to storage in digital format. In the testing process, there exist a number of components in the measuring equipment which may produce system-based inference to the monitored results. These unwanted fluctuations may cause significant error in data analysis, especially when non-linear algorithms are involved. In this study, a pre-processor is developed and applied to separate the unwanted fluctuations (noise or interference) in raw measurements and to reduce the uncertainty in the measurement. Moving average, notch filter, FIR (Finite Impulse Response) filters, and IIR (Infinite Impulse Response) filters are designed and applied to collect the desired information from the raw measurements. Tracer gas concentrations are monitored during leakage and ventilation tests in the model test room. The signal analysis functions are introduced to carry out the digital signal processing (DSP) work. Overall the FIR filters process the CO₂ measurement properly for ventilation rate and mean age of air calculations. It is found that, the Kaiser filter was the most applicable digital filter for pre-processing the tracer gas measurements. Although the IIR filters help to reduce the random noise in the data, they cause considerable changes to the filtered data, which is not desirable.
PAQman International Campaign for ‘Portal Air Quality Management’
Heekwan Lee 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
While considering the air quality management task in a port area, the ship air emission from ocean-going vessels is getting more and more concern as of its significant amount of air emission and its impact onto the local air quality in turn. This could be even worse due to steadily increasing volume of maritime logistics, which has been triggering a series of approach to mitigate ship air emission, e.g. emission control area (ECA), vessel speed reduction (VSR), alternate marine power (or cold ironing), green ship technology, etc. International Maritime Organization (IMO) has been leading a large volume of discussion and idea development regarding this ship air emission management and green gas emission as well while introducing the countermeasures above. <그림은 본문 참조> Producing and enhancing the inventory of ship air emission becomes a critical issue for further study of portal air quality management. Air / Climate Group of INU (Incheon National University) has been working on this topic since 2005 and able to design and develop the engineering solution of PAQman© (Portal Air Quality Management System, Korean patented in 2006 and revised 2021). Throughout the study, the air emission inventory guidelines available have been applied and analyzed to provide further practical approaches for portal air quality management concern, including air emission mapping as shown next. Recently the whole system pf PAQman© has been rebuilding with remarkable improvements in its system design and its performance, which leads to initiate ‘PAQman Campaign’ for worldwide in-situ application and its applicability study. From this campaign, each port joined would be able to check and analyze its own air emission characteristics including maritime traffic information and air emission mapping. Any further communication or discussion on ‘PAQman Campaign’ would be more than welcome.
CAE를 이용한 자동차 Front Bumper fascia의 사출 성형 해석
이형수(Hyoungsoo LEe),김연술(Younsul Kim),이희관(Heekwan Lee),양균의(Guneui Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Plastic injection molding products are increasing gradually in automobile components parts. Among them, large injection melded parts such a automobile bumper fascia and instrument panel are known as not only expensive but also time consuming from design to mass production. Design and manufacture of the large injection molded parts have to repeat various processing modification of mold and tryout. It could simulate design factor simulation on several conditions at mold design process by the development of CAE technology. It has effects on reduce mold making time and cost. But, these studies attach importance to small injection mold. <br/> This paper presents CAE simulation to injection molding of the large molded parts. Optimization of molding if discusses on type and location of runner and gates. And the simulation results are compared with fill time, weld line and injection pressure in actual process and parts .
구희관(Heekwan Koo),정한민(Hanmin Jung),이미경(Mikyoung Lee),성원경(Won-Kyung Sung) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
본 논문은 자동적인 언어기반자원구축을 위해 신문 말뭉치에서 괄호를 이용하여 추출한 대역어쌍들을 군집화하고 각 군집에서 적합대역어를 선정하는 방법을 제안한다. 기존 연구에서 주로 제시된 음차표기어 대역쌍 추출 방법은 완전한 형태의 영어원어 자소 정보를 이용하기 때문에 약어는 고려대상에서 제외되었다. 그러나 약어형태의 영어원어가 신문에서는 약 82%를 차지하기 때문에 이를 처리할 방법이 필요하다. 따라서 본 논문에서는 바이그램을 기본으로 하는 형태정보를 이용하여 적합대역어를 선정하고 이와 형태정보를 공유하는 한국어대역어쌍들을 군집화한다. 또한, 음차표기어와 두문자어에 대한 처리를 추가하여 적용범위를 넓힌다. 실험을 위하여 신문말뭉치에서 추출한 대역어쌍 1,806개 중 영어원어를 기준으로 한국어대역어의 수가 5개 이상인 대역어쌍 집합 200개를 선정하였다. 본 논문에서 제시한 방법으로 측정한 결과, 대역어 군집화에 대해서는 74%의 정확율과 65%의 재현율을, 적합대역어 선정에 대해서는 97%의 정확율을 보였다.
구희관(HeeKwan Koo),강인수(In-Su Kang),정한민(Hanmin Jung),이승우(Seung-Woo Lee),성원경(Won-Kyung Sung) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_1
인용 매칭(Citation Matching, CM)은 동일한 논문을 지칭하는 인용레코드(Citation Record)를 군집화하는 방법이다. 일반적으로, 저자, 논문제목, 게재지명이나 출판연도 등의 인용 필드로 구분하는 인용 필드 분해가 인용 매칭 보다 선행하게 된다. 상당히 많은 연구가 인용 매칭과 인용 필드 분해의 문제를 해결하고자 했지만, 인용 필드 분해와 인용 매칭과의 상관관계에 대한 연구는 부족하였다. 인용 매칭에 대한 인용 필드 분해의 여러 측면 중에, 본 논문은 인용 매칭에 가장 영향력이 있는 인용 필드를 밝히고자 한다. 첫 번째 시도로, 수작업으로 인용 필드 분해를 수행한 다양한 크기의 인용 필드 집합에 대하여 인용 매칭의 성능을 비교하였고, 그 결과 많은 인용 필드를 사용한 인용 매칭이 인용 레코드를 더 잘 군집화 할 수 있다는 것을 확인하였다. Citation matching (CM) is a method for clustering citation records that refer to the same paper. Normally, CM is preceded by citation field segmentation (CFS) which divides a citation record into its fields such as author(s), a title, a title of publication, year, etc. Although many studies have attacked CFS and CM, the relationship between CFS and CM was not sufficiently explored. Among many aspects of the effect of CFS on CM, this study concentrates on what citation fields should identify for CM. As its first attempt, we compared CM performances over different sets of citation fields manually segmented, and confirmed that the use of more citation fields help CM to cluster citation records better.