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중수로 원전 종사자의 방사선량 평가를 위한 $^{14}C$ 인체대사모델 분석
김희근,이형석,하각현,Kim, Hee-Geun,Lee, Hyung-Seok,Ha, Gak-Hyun 대한방사선방어학회 2003 방사선방어학회지 Vol.28 No.3
$^{14}C$은 중수로원전에서 연돌(Stack)을 통해 방출되는 중요한 방사성 핵종중의 하나로, 대략 95% 가량이 이산화탄소의 형태로 발생되고 방출되고 있다. 방사성탄소는 발생에너지가 낮은 베타 방출체로서 외부피폭은 크게 영향을 미치지 않는다. 따라서 중수로에서 탄소는 흡입이나 섭취를 통해 작업자 체내로 유입되는 경우에만 내부피폭을 일으키고 있다. 일반적으로 탄소는 신체에서 불활성 기체와 같은 거동을 보이기 때문에 섭취경로에 의한 피폭이 흡입경로에 의한 피폭보다 훨씬 높은 것으로 알려져 있다. 따라서 작업장에서 탄소의 흡입에 의한 방사선 피폭은 거의 일어나지 않으나 캐나다 원전의 압력관 교체 작업시 아주 소량의 피폭을 일으킨 경험이 있다. 본 논문은 원전 작업장에서 일어날 수 있는 방사성탄소의 흡입에 대비하여 방사선 피폭평가를 위한 방사선방호 프로그램을 수립할 목적으로 방사성탄소의 인체 대사모델 등에 대한 분석을 수행하였다. Carbon-14 is one of the major radionuclides released by CANDU Nuclear Power Plants(NPPs). It is almost always emitted as gas through the stack. From CANDU NPPs about 95% of all carbon-14 is released as carbon dioxide. Carbon-14 is a low energy beta emitter which, therefore, gives only a small skin dose from external radiation. As carbon dioxide Is physiologically rather inert gases for man's metabolism, the inhalation dose is probably less than 1 % of the ingestion dose. But this source of carbon-14, formed in a closed, nor-oxidative environment, was subsequently released into the workplace as an insoluble particulate when these systems were opened lip for re-tubing at CANDU NPPs. As a part of the improvement of dosimetry program at Wolsong Nuclear Power Plants, the carbon-14 metabolism based on references was investigated and studied to setup the internal dosimetry program due to inhalation of carbon-14.
도시 맥락적 관점에서 공공 공연예술시설의 접근성에 관한 연구- 2000년대 이후 건립된 국내·외 사례를 중심으로 -
김희근,고영선,여영호 한국문화공간건축학회 2018 한국문화공간건축학회논문집 Vol.- No.64
Since the 1990s, many citizens have been interested in performing arts and it has continued. Therefore, local governments began to build performing arts centers that citizens needed. However, the performing arts center as public architecture is negatively assessed as being open to some citizens rather than being used as opened public architecture for all citizens in these days. The reason for this is that the performing arts centers as public architecture have issues such as location, accessibility, and publicness. Therefore, the purpose of this study was to establish the roles and directions of performing arts center as public buildings through a research of the accessibility of performing arts center. In order to achieve this goal, the location, connectivity, and openness of performing arts center were analyzed in the urban context of domestic and international cases. As a result of the study, the overwhelming shape of a single building may be functionally reasonable, but it is difficult for citizens to recognize it as a public space in terms of its scale. Second, it is an elevation that emphasizes visual contact by using transparent materials such as glass and polyester. Third, as a public architecture, it is to create an open outdoor space to emphasize the public. As a result, we hope that performing arts center will have value that can be used as a ordinary space for citizens and will be utilized as basic materials to gain access to public performance art centers without discrimination.
하이네의 "히브리 선율"에 나타난 ‘미래와 현재의 대비’
김희근 한국독어독문학회 2005 獨逸文學 Vol.104 No.-
Die Diskrepanz zwischen Utopie und Wirklichkeit zeigte Heines Gedicht Hebräische Melodien. Hier wurde das Problem in solchen Spannung vorgestellt, daß der Kontrast zwischen Zukunft und gegenwärtiger Zeit fast zum beispielhaften Charakter von seinem Geschichtsdenken gerät. Die von Engeln verkörperte Welt deutet klar auf das in diesem Gedicht verhandelte Thema hin: Die Sehnsucht nach einer Utopie. Auf das Drängen dieser Sehnsucht reagiert Heine mit einer fragmentarischen Form. Er konnte das Problem nur fragmentarisch behandeln, es sei denn, daß für ihn die Zukunft unsagbar und unerreichbar erschien. Zu bemerken ist jedoch, daß wir den ambivalenten Charakter nicht als das Zeichen einer gescheiterten Zukunftskonzeption deuten müssen. Das Gewicht der Zukunftsbilder wird immer durch den Verweischarakter bestätigt. Er benutzt diese ambivalente Form als das Moment, das den festen Umriß der Zukunft vor einem Hintergrund der Wechselwirkung zwischen Utopie und Realität erkennen läßt. Durch die Entdeckung der Differenz kann man in die Lage versetzt werden, eine neue Einstellung zur Geschichte anzunehmen. Heine griff zurück auf die Rolle des Kämpfers um die Befreiung der Welt und befand sich stets auf der Suche nach einem Instrumentarium, mit dem er die negative Situation bewältigen könnte. Es mag in diesem Sinne nicht Zufall sein, daß er sich in dem Gedicht 「Bimini」 noch einmal dem Thema der Sehnsucht nach einer Utopie zuwendet.
음질향상 기법과 모델보상 방식을 결합한 강인한 음성인식 방식
김희근,정용주,배건성,Kim, Hee-Keun,Chung, Yong-Joo,Bae, Keun-Seung 한국음성학회 2007 음성과학 Vol.14 No.2
There have been many research efforts to improve the performance of the speech recognizer in noisy conditions. Among them, the model compensation method and the speech enhancement approach have been used widely. In this paper, we propose to combine the two different approaches to further enhance the recognition rates in the noisy speech recognition. For the speech enhancement, the minimum mean square error-short time spectral amplitude (MMSE-STSA) has been adopted and the parallel model combination (PMC) and Jacobian adaptation (JA) have been used as the model compensation approaches. From the experimental results, we could find that the hybrid approach that applies the model compensation methods to the enhanced speech produce better results than just using only one of the two approaches.
전신계측기를 이용한 인체 방사능측정 및 방사능오염 구분에 대한 고찰
김희근,공태영,이경진 (사)한국방사선산업학회 2018 방사선산업학회지 Vol.12 No.2
A whole body counter (WBC) is used in nuclear power plants (NPPs) to identify and measure internal radioactivity of workers who is likely to ingest or inhale radionuclides. A WBC has several counting geometries, i.e. the thyroid, lung, whole body and gastrointestinal tract, considered with the location where radionuclides are deposited in the body. However, only whole body geometry is normally used to detect internal radioactivity during whole body counting at NPPs. It is overestimated internal exposure dose because this measured values are indicated as the most conservative radioactivity values among the them of other’s geometry. It is often possible to estimate external contamination as internal contamination due to radionuclides attached to the skin of radiation workers and this leads to an excessively conservative estimation of radioactive contamination. In this paper, the reanalysis of previous experiments for radioactivity depending on the counting geometry of WBC using phantoms and standard radiation sources was carried out in order to improve overestimated internal exposure dose. Quantitative criteria could be used for selecting the optimal WBC counting geometry. Furthermore, discrimination guideline according to ratio of count rates of the upper and lower detectors of the WBC is provided through statistical analysis method.