• Environmental engineer
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• v.19 s.204
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• pp.84-86
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• 2003

• Environmental engineer
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• s.71
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• pp.42-45
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• 1992

• Electric Engineers Magazine
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• s.338
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• pp.28-31
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• 2010

• Korean Journal of Environmental Agriculture
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• v.24 no.4
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• pp.319-325
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• 2005

Sediments of Mankyung and Dongjin river were examined on the physico-chemical properties and phosphorus fractionations. The content of total-P in sediment of Mankyung river ranged from 290.1 to 405.4 mg/kg (average = 363.4 mg/kg), while that in sediment of Dongjin river ranged from 304.1 to 431.7 mg/kg (average = 353.6 mg/kg). In both rivers, the total-P was highest in June to September. It is presumed that surficial sediment in arable land flowed into the rivers with rainfall-runoff. Phosphorus fractionations in Mankyung and Dongjin river were apatite-P 52.1% and 42.7%, residual-P 27.3% and 34.2%, nonapatite inorganic-P 18.1% and 22.5%, and adsorbed-P 0.6% and 0.6%, respectively. Adsorbed-P in sediment was the most scarcity fraction. It thus appears that adsorbed phosphorus was not effected in aquatic ecosystem. But nonapatite inorganic-P would be highly released under changes of redox condition and pH in aquatic ecosystem.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.1156-1159
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• 2009

Since the middle of the 1960's, revitalization of the media art has showed a new paradigm shift as a alternative to existing art genre. According to advances in technology the form of art becomes various. Nowdays, art work which is mixed with media and other genre is popular because of hybrid culture. The image medium has flexibilty to incorporate with other genre because of medium character. The media installation that applied the image medium means to mixed work of sculpture and media. The sculpture and media has been broadened the field through the media installation. this study discuss art works projected image on sculpture among various media installation works. The materiality of the sculpture and the vision of the image mix up each other. It is associated with M. Merleau-Ponty's sens theory.

• Proceedings of the Korea Society for Simulation Conference
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• 1999.04a
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• pp.11-19
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• 1999

Farmer 모델은 시스템 개체구조(System Entity Structure)의 개념을 도입한 지식표현을 위해 사용되는 프레임 구조모델로서 다중성 추상화 개념(Multiplicity Instance Concept)은 하나의 개체를 구성하기 위하여 동일한 형태의 구성요소가 여러 번 발생하는 경우에 이의 대표적인 요소만을 표시하는 추상화 개념이다. 다중성 추상화 개념에서 정의된 대표개체는 자신의 인스턴스들을 가질수 있다. 이들 인스턴스들은 IM-컴포넌트 타입 개체노드 및 OM-컴포넌트 타입 개체노드이며 다중성 인스턴스 링크를 이용하여 대표개체와 연결된다.

• Electrical & Electronic Materials
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• v.6 no.3
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• pp.214-219
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• 1993

고온에서 실리콘에 인을 확산시키기 위한 새로운 고체 판상 원료를 개발하였다. Source Wafer는 거품 형태의 골결을 지닌 불활성 재료에 Yttrium metaphosphate가 들어있는 구조로 되어있다. 새로운 고체 판상 원료를 사용하여 고온에서 인을 확산시켜서 재현 가능한 Sheet resistance와 깊은 Junction을 얻었다. 일련의 한 시간 도핑 결과들로부터 새로운 고체 판상 원료의 수명은 40시간 이상인 것으로 판명되었다. 1150.deg.C에서 인의 실리콘에로의 확산에 대한 유효 확산계수와 대응되는 활성화 에너지의 값을 구하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.1257-1260
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• 2021

1인 가구 수의 증가로 시장에서 1인 가구를 위한 서비스와 재화가 제공되고 있고, 시장에서 소비자로서 입지를 다지고 있음에도 합리적인 가격에 소비하지 못하고 있다. 사용자들이 스스로 주최하는 공동구매를 통해서 합리적이고, 친환경적이고, 소비자 후생적인 소비를 도모하고, 나아가 1인 가구 웹 커뮤니티 형태로 발전하길 기대한다.

• Korean Journal of Ecology and Environment
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• v.48 no.3
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• pp.168-175
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• 2015

This study was conducted in autumn to determine phosphorus (P) fraction in sediments of Daechung Lake, to elucidate controlling factors for sedimentary P, and to compare with the other areas. For this study, sediment samples were collected at 6 sites only once on November 2014 using ponar grab and analyzed for solid-phase P (Loosely adsorbed, Fe-bound, Al-bound, detrital apatite, and refractory organic P) by sequential extraction. Total phosphorus (TP) was relatively high in front of Daechung Dam and Hoinam where fish farm was run until 1997. The dominant sedimentary P form was Al-bound P, followed by Fe-bound P, which could be released from sediment to water column during suboxic state. Based on principal component analysis, Al-bound P, Fe-bound, and TP were controlled by grain size of sediments. Loosely adsorbed, detrital apatite, and refractory organic P were relatively highly accumulated at the mouth of major tributaries where suspended sediments were delivered. Sedimentary P concentrations in Daechung Lake sediments were not higher than in other lake sediments. Therefore, based on these results, major controlling factors were grain size and input of suspended sediments from tributaries.

• Journal of the Korea Convergence Society
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• v.13 no.5
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• pp.509-515
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• 2022

To comparison of the differences in affecting factors of prevalence of obesity and hypertension according to the employment type of single-person households, aged 20 to 59 years old people were classified by permanent and temporary workers(n=566). A questionnaire survey was conducted by purposive quota sampling to ask disease, income and health habits. In the results of logistic regression on hypertension and obesity, the prevalence of hypertension was significantly affected as age and obesity increased regardless of employment type. In particular, temporary workers with lower income were more likely to have hypertension(p<0.001). The prevalence of obesity was significantly lower for female than for male regardless of employment type. In particular, temporary workers had a higher prevalence of obesity as their dinner fidelity decreased(p<0.001). As a result, chronic disease management for single-person households with lower income and dinner fidelity should be intervened in more useful ways.