• Architectural research
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• 제1권1호
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• pp.47-53
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• 1999

An interesting of desktop air-conditioning system is the Personal Environmental Module(PEM) System. The PEM system allows the occupant to choose the desired temperature, air volume and direction of the discharged air. In this study, the measurements on the age of air and the air change effectiveness, using the tracer gas method, are carried out to analyze the ventilation performance for provision of fresh air near the breathing zone by the PEM. The relations between the PEM for optimal control and other factors related to indoor air quality, and the ventilation for the PEM are examined. Also, three different supply diffuser types(desktop, floor and ceiling) are compared in view of their ability to distribute supply air to the workstation breathing zone. The desktop diffuser type could deliver air directly to the occupants breathing zone with a high degree of effectiveness. The minimum local age of air was measured in the breathing zone, which is directly supplied with air from the PEM diffusers, and the measured local air change effectiveness of the desktop diffuser in the breathing zone was about 1.13 to 1.23 times greater than that of the ceiling and floor diffusers. When the minimum outside air change rate as specified using ASHRAE Standard 62R is supplied with a desktop diffuser type, the volume of outside air can be reduced 13 to 23%, resulting in a commensurate in ventilation energy use.

• 설비공학논문집
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• 제13권4호
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• pp.252-261
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• 2001

Room air flow and temperature distribution was numerically investigated where a PAC(personal air conditioning) system was installed. The calculated results were compared with those from experiments. The effects of the important operation parameters such as the air flow rate, velocity, and temperature at the diffuser on the thermal performance of the system were studied. The possibility of energy saving using the PAC system was verified from the results, It was shown that the warm air from the diffuser could not spread over the whole task area if the inlet temperature was too high.

• ETRI Journal
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• 제35권4호
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• pp.617-624
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• 2013

Low power consuming and highly responsive semiconductor-type microelectromechanical systems (MEMS) gas sensors are fabricated for real-time environmental monitoring applications. This subsystem is developed using a gas sensor module, a Bluetooth module, and a personal digital assistant (PDA) phone. The gas sensor module consists of a $NO_2$ or CO gas sensor and signal processing chips. The MEMS gas sensor is composed of a microheater, a sensing electrode, and sensing material. Metal oxide nanopowder is drop-coated onto a substrate using a microheater and integrated into the gas sensor module. The change in resistance of the metal oxide nanopowder from exposure to oxidizing or deoxidizing gases is utilized as the principle mechanism of this gas sensor operation. The variation detected in the gas sensor module is transferred to the PDA phone by way of the Bluetooth module.

• 생물환경조절학회지
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• 제7권1호
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• pp.1-8
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• 1998

본 연구에서는 다동온실내 작물의 생체정보와 실내외 환경요인의 정보를 얻기 위하여 복합환경제어용 시스템을 개발하였다. 이를 원예연구소에 설치하여 작동이 잘되는 것을 확인하였다. 앞으로 복합환경제어가 될 수 있도록 작물에 대한 온실의 환경 및 생체정보에 관한 연구가 필요할 것이다. 연구결과를 요약하면 다음과 같다. 1. 하드웨어는 각 기능별로 완전한 독립구조로 된 모듈형태로 구성이 되며, 각 모듈이 슬롯형태로 제작되어 수리 및 수정이 용이하고, 이동이 편리한 장점을 가지고 있다. 2 PC에서 통신을 통하여 시스템의 규모를 조절할 수 있으며, 각 입출력 단자의 기능 및 범위를 조절할 수 있다. 또한 각 제어 블록 사이에도 통신이 가능하여 유동성과 확장성이 뛰어나다. 3 환경제어 로직은 기존의 시스템에서 사용되었던 타이머를 이용한 작동기기별로의 제어가 아닌 온실전체의 온도와 습도를 위주로 하여 시퀀스 제어를 하도록 구성하였다.

• 한국환경교육학회지:환경교육
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• 제14권2호
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• pp.76-94
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• 2001

Promoting positive values, attitudes, participation and personal actions on the basis of the acquisition of one's knowledge and skills is emphasized on teaching environmental education. To complete this purpose of environmental education, it is necessary not only to use various and practical educational resources, but also to develop information system, with multimedia and internet, which are effective for learning. This research attempts to assess the consistency of planning, organization and operation of integrated program for social environmental education which was developed for the necessities mentioned above. We surveyed about the accuracy of contents, usefulness, convenience and easiness of Integrated program for social environmental education. Also, we used a questionnaire to clarify the values and attitudes of respondents after they took environmental education. Then, technically, descriptive statistical method has been used to analyze the results of these surveys. Finally, we conduct an examination of the distribution of chi-square to verify the relationship between the learner's experience of using computer and one's concern about environmental issues. The results of this program, developed by research team, can be assessed by following five basic elements: usefulness, practicality, appropriation, efficiency and effectiveness. More than 90% of respondents said that this program is convenient and easy to loam. Also, more than 85% of whole respondents identified that after teaming this program they recognized more clearly what the main contents of environmental education are. In addition, we got positive response from 93% of respondents that they could understand environmental problems. On the other hand, values and attitudes of respondents have not improved a lot after the environmental education compared with the remarkable change in their recognition and understanding of environmental issues; only 34% of respondents responded that they changed their life style for making better environment after teaming this program. But it is clear that they understand much better about the environmental policy after they are educated. Developed by using information system, this integrated program for social environmental education may get different results according to a respondent's experience of using computer. Therefore, the more a respondent got a chance to use computer for a long period of time, the more he/she gave positive evaluation on the convenience and easiness of this program. However, there was no certain relationship between the frequence of using computer and one's understanding of environmental issues. Futhermore, a person who has constant concerns about environmental problems showed more positive attitudes against the understanding of environmental education. This integrated program for social environmental education, characterized by integrated, specialized and efficient educational system, can also be used as a curriculum or teaching materials for environmental education for adults; especially, it would be appropriate for teaching learners at all levels, who have different personal characteristics, to let them acquire virtual education by using information system.

• International Journal of Contents
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• 제10권4호
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• pp.69-74
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• 2014

General location aware systems are only applied to indoor and outdoor environments using more than three transmitters to estimate a fixed object location. Those kinds of systems have environmental restrictions that require an already established infrastructure. To solve this problem, an Object Location Estimation (OLE) algorithm based on PTP (Point To Point) communication has been proposed. However, the problem with this method is that deduction of performance parameters is not enough and location estimation is very difficult because of unknown restriction conditions. From experimental tests in this research, we determined that the performance parameters for restriction conditions are a maximum transmission distance of CSS communication and an optimum moving distance interval between personal locations. In this paper, a system applied OLE algorithm based on PTP communication is implemented using a CSS (Chirp Spread Spectrum) communication module. A maximum transmission distance for CSS communication and an optimum moving distance interval between personal locations are then deducted and studied to estimate a fixed object location for generalization.

• Environmental Analysis Health and Toxicology
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• 제29권
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• pp.17.1-17.6
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• 2014

Objectives Antimicrobial chemicals are used in a variety of household and personal care products. Exposure to antimicrobial household products has been hypothesized to lead to allergic diseases in children. Methods We investigated antimicrobial household product exposure and allergic symptoms in Korean children. An antimicrobial exposure (AE) score was derived. To examine the symptoms of allergic diseases (current wheeze, current rhinitis, and current eczema) in the past 12 months, we used a questionnaire based on the core module of the International Study of Asthma and Allergies in Children. Complete data for the analysis were available for 25,805 of the 35,590 (72.5%) children. Results The prevalence of current allergic diseases was as follows: wheeze, 5.6%; allergic rhinitis, 32.6%; and eczema, 17.7%. The mean (standard deviation) AE score was 14.3 (9.3) (range: 0-40). Compared with subjects with a low AE score (reference), subjects with a high AE score (fourth quartile) were more likely to have symptoms of wheezing and allergic rhinitis (adjusted odds ratio [aOR] for wheezing 1.24, 95% confidence interval [CI], 1.05-1.45, p for trend=0.24; aOR for allergic rhinitis 1.30, 95% CI, 1.20-1.40, p <0.01). Conclusions These findings suggest that frequent use of antimicrobial household products was associated with current wheeze and current allergic rhinitis.

• 벤처창업연구
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• 제14권1호
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• pp.47-58
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• 2019

본 연구는 창업가 개인특성과 환경특성이 창업코칭활동과 창업가 의식전환을 매개로 창업성과에 미치는 영향에 관한 연구이다. 특히 본 논문은 여러 사업실패원인이 있지만, 대다수의 창업가들이 유연하지 못한 사고로 인하여 성공적인 창업을 하지 못하고 좌절하는 것이 큰 문제로 제기되고 있는 상황에서 이 위험을 줄이기 위해 사업 및 시장경험자와 코칭을 통한 협력적 사업실행이 요구됨을 문제제기로 작성되었다. 이에 본 논문은 선행연구를 창업코칭 중심으로 진행하였는데, 이는 멘토링이 창업가의 문제점을 해결함에 있어 멘토의 직접적인 의견을 제시하는 방식으로 진행되어, 창업가가 스스로 문제를 인식하고 해결하는 행동지향적인 과정이 미흡하기 때문이다. 그렇기에 창업가의 근본적인 문제 해결을 위해 창업코칭활동을 통하여 창업가 스스로 본인의 문제점을 인식하고 답을 찾도록 하는 코칭의 중요성이 강조되고 있다. 본 연구는 크게 네 가지 연구를 진행하였다. 첫째, 창업가의 개인특성이 창업코칭활동에 영향을 미치는지 여부 분석, 둘째, 창업가의 환경 특성이 창업코칭활동에 영향을 미치는지 여부, 셋째, 창업코칭활동이 창업가의 의식전환에 영향을 미치는지 여부, 넷째, 이러한 창업가의 의식전환이 창업성과에 미치는 영향분석 등이다. 실증분석의 결과, 본 연구는 창업가 개인특성이 창업코칭활동에 유의미한 영향을 미치지 못하였지만, 창업가 환경특성은 창업코칭활동에 정(+)의 영향을 미치는 것으로 확인되었다. 더불어 창업코칭활동은 창업가의 의식전환에 정(+)의 영향을 미쳤으며, 창업가 의식전환은 창업성과에 정(+)의 영향을 미침을 확인하였다. 이로써 본 연구는 창업코칭활동과 창업가 의식전환이 창업성과에 긍정적인 영향을 주는 것으로 확인할 수 있었다. 본 연구의 결론은 창업코칭활동으로 창업가의 의식이 전환되어, 창업성과를 높이기 위한 목표 재설정과 실행계획 수립에 도움을 주는 것으로 나타났다. 이에 본 연구결과는 창업기업을 대상으로 하는 다양한 실전창업교육 프로그램들에 코칭방식의 진행이 적극 수용되어야 함을 시사점으로 제시하고 있다.