• 상하수도학회지
• /
• 제18권5호
• /
• pp.628-637
• /
• 2004

In many drinking water treatment plants, chlorination process is one of the main techniques used for the disinfection of water. This disinfecting treatment leads to the formation of disinfection by-products (DBPs) such as haloacetonitriles (HANs), trihalomethanes (THMs), haloacetic acids (HAAs). In this study, headspace-solid phase microextraction (HS- SPME) technique was applied for the analysis of HANs in drinking water. The effects of experimental parameters such as selection of SPME fiber, the addition of salts, magnetic stirring, extraction temperature, extraction time and desorption time on the analysis were investigated. Analytical parameters such as linearity, repeatability and detection limits were also evaluated. The $50/30{\mu}m$-divinylbenzene/carboxen/polydimethylsiloxane fiber, extraction time of 30 minutes, extraction temperature of $20^{\circ}C$ and desorption time of 1 minute at $260^{\circ}C$ were the optimal experimental conditions for the analysis of HANs. The correlation coefficients ($r^2$) for HANs was 0.9979~0.9991, respectively. The relative standard deviations (%RSD) for HANs was 2.3~7.6%, respectively. Detection limits (LDs) for HANs was $0.01{\sim}0.5{\mu}g/L$, respectively.

• 한국실내디자인학회논문집
• /
• 제16권2호
• /
• pp.24-31
• /
• 2007

Berlin Philharmonic Concert Hall is one of most prominent architecture of Hans Scharoun, which is known as the fine combination of the functionalism as an important factor in modern architecture and the hi-developed technology Moreover, the plan and spatial planning of the concert hall is famous for its evolutionary approach compared to other traditional concert halls. The objective of this paper is to examine forms and organic system of functions of this concert hall in order to re-evaluate it's historical meanings in our modern architecture history, The current study will also look into how the personal background of Hans Scharoun has influenced his design in various ways, especially the inside of lobby and auditorium of Berlin Philharmonic Concert Hall.

• 식품산업과 영양
• /
• 제14권2호
• /
• pp.25-32
• /
• 2009

• 도서관문화
• /
• 제17권6호
• /
• pp.19-26
• /
• 1976

본 논문은 1976.5.31~6.5 서울에서 개최된 국제도서관협회연맹대회에서 발표된 것을 번역한 것이다. 저자인 Hans H. Wellisch씨는 미국 매릴랜드대학 도서관학과 교원로 재직하고 있다.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2005년도 학술발표회(1)
• /
• pp.312-313
• /
• 2005

• 한국가구학회지
• /
• 제28권4호
• /
• pp.314-325
• /
• 2017

Hans Wegner, one of the legendary designers who led the 20th century Nordic modern design, is a representative furniture designer of Danish Modern. His beautiful proportions, elaborate structure, lightweight and simple chairs show the essence of Danish modernism for mass production. Designed and built over 500 chairs, he demonstrated the essence of chair design through a fully structured prototype. He shows his passion and craftsmanship as a designer through over 1000 designs. In addition, chair design shows the value of timeless design and is loved by modern times. Therefore, this study aims to study the characteristics of chair design by Hans Wegner and to help furniture design education by analyzing design, structure, function and material.

• 공학교육연구
• /
• 제15권1호
• /
• pp.72-78
• /
• 2012

This paper deals with metaphysical aspects of responsibility focusing on Hans Jonas's Das Prinzip Veranwortung as an attempt to further the discussion on the responsibility of scientists and engineers. After the examination on the necessity of new ethics reflecting the characteristics of contemporary science and technology, the philosophical foundation and major themes of Jonas's future-oriented ethics, i.e. responsibility ethics are analysed. Jonas argued new ethics should consider man and nature simultaneously based on the unification of being and what should be, and presented collectivity, continuity, and future-orientation as a basis of responsibility ethics. In conclusion, this paper suggests implications of Jonas's argument for science and technology ethics such as sustainability, precautionary principle, and responsibility of creator.

• 분석과학
• /
• 제16권3호
• /
• pp.249-260
• /
• 2003

한강에서 채취한 원수에 염소소독제인 hypochlorite를 $10{\mu}g/m{\ell}$의 농도로 투여한 후 1시간~14일까지 TOC (total organic carbon), 잔류염소량 및 탁도 등을 측정하고 THMs (trihalomethanes), HANs (haloacetonitriles), HKs (haloketones), chloral hydrate 및 HAAs (haloacetic acids) 등의 염소소독 부산물의 생성율을 조사하였다. 그 결과 잔류염소량은 투여후 1시간 경과 시 $6{\mu}g/m{\ell}$ 이상에서 14일째에 $1.23{\mu}g/m{\ell}$으로 감소하였으며 TOC 및 탁도는 큰 차이가 없었다. 7일 후 발생한 총 소독부산 물의 농도는 $101.3ng/m{\ell}$ (789.6 nM)이며 이 중 THMs이 69%로 가장 큰 비중을 차지하였다. 그 외에 HAAs가 19%, chloral hydrate가 10% 정도 검출되었으며, HANs와 HKs 및 chloropicrin 등은 미량 검출되었다. THMs 중에서는 chloroform이 $61.5ng/m{\ell}$로 총 THMs 중 약 89% 정도를 차지하였으며 HANs 중에서는 DCAN이 95%인 $0.72ng/m{\ell}$, HAAs 중에서는 TCAA가 50% 등으로 가장 높은 비율로 검출되었다. 각 부산물의 발생량의 상관관계를 조사한 결과 THMs과 HANs의 경우 THMs의 농도가 $40ng/m{\ell}$인 지점을 경계로 HANs과 경쟁적 발생관계가 있음이 나타났다. HAAs의 경우는 특별한 경향성을 나타내지 않았으나 전체적으로 초기에 산화상태가 큰 화합물에서 산화상태가 작은 화합물로 점차 변화하는 것으로 관찰되었다.

• 인터넷정보학회논문지
• /
• 제4권5호
• /
• pp.11-19
• /
• 2003

B2B(Business to Customer)로 시작되어온 전자상거래가 B2B로 대체되면서 e-Business영역에서 빠른 속도로 성장하고 있다. 최근 국내에서는 대기업을 중심으로 자체 구매조달 시스템을 자사 ERP와 연계하여 1:n개념의 e-Procurement가 발전되고 있다. 그러나 플랜트 산업의 e-Biz의 활성화를 위하여서는 동시에 많은 구매자와 판매자가 활동할 수 있는 e-marketplace의 구축이 확장된 기업개념으로 비즈니스의 성공을 위한 핵심요인이 되었다. 이에 본 연구에서는 플랜트 산업의 e-Biz화의 핵심 요소인 구매 Process System 및 관련 Module을 개발함으로써 플랜트 산업의 e-Transformation전략의 기틀을 마련하고 기업의 전자상거래의 시범적인 사례가 될 것으로 기대한다. 구매 Process System은 견적요청서를 중심으로 입찰정보와 계약정보를 관리하는 e-Purchasing Module, 납기준수를 위한 정보활동 내역을 관리하는 e-Expediting Module, 사용자인증 권한 제어 정보를 관리하는 e-Certification Module, 게시판과 Q&A 등을 관리하는 e-Basic Module로 구성된다.

• 한국경영과학회지
• /
• 제21권3호
• /
• pp.227-236
• /
• 1996

In this paper an algorithm based on cutting plane approach is developed which constructs all the efficient p-tuples of multiobjective integer linear fractional programming problem. The integer solution is constrained to satisfy and h out of n additional constraint sets. A numerical illustration in support of the proposed algorithm is developed.