공기청정 겸용 전열교환 환기유니트 적용시 실내공기환경 CFD 시뮬레이션

이정재,이시환,김용경,박성관 대한건축학회 2005 대한건축학회논문집 Vol.21 No.3

Recently, indoor air pollution problem is happening in apartment housing due to the use of new building materials that emit poisonous chemical such as Volatile Organic Compounds (VOCs) and Formaldehyde (HCHO) etc. Therefore, the issues about security of healthy dwelling environment is becoming important. There are the methods to reduce indoor air contaminant. First, source control which is the method to control the emission of contaminant from building materials. Second, adopting the air cleaning and ventilation system which is the method to dilute the concentration of contaminant and exhaust the contaminant to outside of the building quickly. In this research, we evaluated the improvement effect of the indoor air quality quantitatively by using CFD(Computational Fluid Dynamics) simulation on the assumption that air cleaning and ventilation system is installed.

주택용 환기시스템의 덕트설계를 위한 분배기 적용성 검토

이정재,최진혁,주성용 東亞大學校 建設技術硏究所 2007 硏究論文集 Vol.31 No.1

Although these days application of heat recovery ventilation and improved kitchen ventilation system came into wide use in mixed-use residential Buildings and exclusive residences, there are not enough ventilation systems except the local ventilation of kitchens and rest rooms. It is very important part to regulate and distribute correct air flow rate for controlling air change rate. The purpose of this study is to investigate the application of distributor at house ventilation system by comparing a duct system without distributor and with distributor. The results of this study are as follows. (1) When using distributor though the size of duct diameter is reduced rapidly, the pressure loss doesn’t rise largely. The pressure loss without distributor is 4.08 mmAq, the pressure loss with distributor 4.10 mmAq. (2) To use distributor can reduce materials of duct and secure enough ceiling space by reducing duct diameter. (3) Diameters and air flow paths of distributor on the design stage are important part for accurate air flow rate. 21 세기는 환경에 대한 고려 없이는 쾌적한 삶과 지속가능한 경제발전이 불가능한 시대 이다. 특히 요즘 건축물에서 고기밀, 고단열 을 강조하고 있으며,근래 건축기술의 발달과 토지이용의 효율화에 따라 20층 이상의 초고층 공동주택의 건설이 늘어나고 있으나 (Moon, J.S, 2004), 고충부분에서는 환기의 어려움이 발생하는 실정이다. 동시에 새 건축물의 자재나 도료에서 발생되어 호흡계 증상 및 신체의 부조화를 일으키는 새집증후군의 원인물질인 포름알데히드, 휘발성 유기 화합물질 등에 대해서는 대책이 미비한 실정이다. 때문에 국내 건축법의 환기기준이 강화되어 기존의 자연환기에만 의존했던 것과는 달리 2006년 l 월부터 건축법령에서 정한 신축되는 공동주택의 필요환기횟수는 0.7회이며, 이 기준을 충족하지 못할 경우 기계 환기 설비의 설치가 필요하게 되었다. 기존의 공동주택에서 환기시스템이 적극적으로 도입되기 어려웠던 이유는 설치비용의 경제성 문제뿐만 아니라 천장부분의 공간 부족으로 덕트 설치의 어려움이 있었으나 2005 년 l 월부터 시행되어진 소방법에 의해 11 층 이상의 공동주택에서는 전층에 스프링클러를 설치해야함에 따라 천장공간이 확보되어 덕트 설치 또한 가능하게 되었다. 환기시스템이 공동주택에 적용될 경우, 일반적으로 환기유나트 본체에서 각 실까지는 덕트를 통하여 신선한 공기가 공급된다. 주택환기시스템 덕트 설계의 경우, 소 풍량 으로 운전되므로 정확한 치수의 덕트 설계가 요구되며 24시간 가동을 전제로 하기 때문에 덕트내의 압력손실감소와 적절한 팬의 선정은 에너지 손실방지를 위해 반드시 고려되어야 할 부분이다.

경남지역의 신축공동주택 실내공기질 실태조사에 관한 연구

이정재,최석용,김상희 東亞大學校 建設技術硏究所 2006 硏究論文集 Vol.30 No.1

Recently, there has been growing concern regarding Indoor Air Quality(lAQ) so that IAQ problems from insufficient ventilation and emission of toxic substance have become increasingly important issue. Although "regulation for air quality in the public buildings" was passed in May 2004, there are no criteria for IAQ of the new apartment housings in that rule however it is difficult to indicate the correct judgement grounds about IAQ to residents and to limit using building material which causes Sick House Syndrome(SHS). The government has been making "IAQ criteria of the new apartment buildings" since 2004, in order to determine properness of IAQ and present it to residents. For the purpose of grasping status on IAQ levels of the new apartment housings in this study, IAQ of approximately new eighty apartment buildings in Gyeungnam area was measured and The result of field survey of IAQ will be used to make Data Base for criteria about "IAQ of the new apartment housings".

신축아파트에서의 환기량 변화에 따른 실내공기질 개선효과

이정재,최석용,김상희 東亞大學校 建設技術硏究所 2006 硏究論文集 Vol.29 No.2

The recent indoor air quality problem in a newly-built apartment house is resulted from the improvement of airtightness performance and the use of the building material contained harmful chemical substances. As a result, these cause indoor air quality gradually to become worse and the harmful effect on occupant health called Sick House Syndrome. The most effective solution to improve the indoor air quality is to encourage the use of green building material. However, if the house is built with general building material, ventilation with outdoor air is alternative to dilute the pollutant concentration. The purpose of this research is to find optimum ventilation time in a newly-built apartment house at which the ventilatoris installed. It is found that the HCHO and toluene concentrations are remarkably decreased with the elapse of ventilation time and the concentration reduction rate is increased with increment of air change rate after one hour after operating the ventilator.

PHI기술을 이용한 신축공동주택 베이크아웃 실험 및 적용성 검토

이정재,문성민,최석용 東亞大學校 建設技術硏究所 2007 硏究論文集 Vol.31 No.1

Building materials which are not properly verified their harmful chemical emission have been widely used in architecture. The fact has caused air pollution and become a big issue in Korea. As living environment for human body became a concern, many studies about reducing air pollution in living areas are going on nowadays. This study analyzed the resisting effect of HCHO and VOCs based on data obtained from experimentation on newly built apartments by PHI cell, which has been used in developed countries(like the usa), and by bake-out, also analyzed about energy expenditure of bake-out and PHI operation. The result of this experiment shows that PHI is more efficient than bake-out as considering the contaminate density reduction rate and energy expenditure. However, it doesn’t exactly coincide with the standard indoor air quality of Korea. For practical use of PHI system, we need to continue studying how to multiply the size of PHI cell and the fan adhered to unit.

인체 헤모글로빈의 효소반응성에 대한 연구

이동섭,안희중,김응수,이영보,최상규 內務部 國立科學搜査硏究所 2002 國立 科學 搜査 硏究所 年報 Vol.34 No.-

산욕초기 산모의 신생아 돌보기활동에 관한 연구

오현이,조성경 朝鮮大學校 附設 醫學硏究所 1992 The Medical Journal of Chosun University Vol.17 No.1

The purpose of this study was to measure the degree of early postpartum mothers' care-taking activities of newborn, and to identify the factors influencing the difference of early postpartum mothers' care-taking activities. The subjects of this study consisted of 100 early postpartum mothers visiting 1 University Hospital and 1 OB. & GY. clinics in Kwang Ju. The data were collected from March 1 to 31, 1991, by questionnaire method. The instrument used for this study was developed by researcher through literature review. The data were analyzed by percentage, mean, t-test, ANOVA with S.P.S.S. program. The results of the study were as follows; 1. The average physical care-taking activities score of subject was 17.55 and the average emotional care-taking activities score was 24.35. 2. The physical care-taking activities were classified into six, and their order of getting score was elimination(0.98), cord care(0.79), bathing (0.78), feeding(0.70), recognizing the abnormal signs(0.63), controlling body temperature and room humidity (0.60). 3. "The baby should not be disturbed while feeding"(1.93) was the item which mothers did best and "mother talked to baby using different tone of voice" (0.91) did least among the emotional care-takig activities. 4. The mothers' general characteristics such as family structure and the starting period for feeding produced statistically significant difference(t=-3.05, P=0.003 and F=2.21, P=0.049 respectively) in the degree of an early postpartum mothers' physical care-taking activities. The status of the early postpartum mothers' employment produced statistically significant differ ence in her emotional care-taking activities (t=- 2.77, p=0.007).

자폐아동의 애착 안정성

김상원,신의진,이경숙 대한소아ㆍ청소년정신의학회 1997 소아청소년정신의학 Vol.8 No.2

유아자폐증의 정신병리과 혈소판 혈장 세로토닌 농도와의 상관관계

신의진,민성길 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.6

We attempted to investigate the abnormalities of serotonergic system in infantile autism, and to find the relationship between the abnormalities of serotonergic system and the psychopathology of infantile autism. In this study, the concentrations of 5-HT in platelet rich plasma(PRP) were compared among autistic, atypically autistic and control groups, and the psychopathology of infantile autism, measured with Childhood Autism, Rating Scale(CARS), was correlated with the concentrations of 5-HT in PRP in autism o? atypical autism group. The subjects of this study were 48 autistic patients, 15 atypically autistic patients and 38 control children and the concentration of 5-HT was measured using HPLC-ECD(High Performance Liquid Chromatography-Electrochemical Detection) method. The results were as follows : 1) The concentration of PRP 5-HT in patients with atypical autism was significantly higher than that of control children, and patients with atypical autism showed the highest level. 2) The concentration of PRP 5-HT was related with 8th CARS item, abnormal auditory responsiveness, in autistic group. But there was no significant correlation in atypically autistic group. 3) Age was not significantly associated with the concentration of PRP 5-HT in autistic, atypically autistic and control groups. 4) The cognitive function(SQ) was not significantly associated with the concentration of PRP 5-HT in autistic and atypically autistic groups. 5) No significant sex difference of PRP 5-HT concentration was found in the autistic, atypically autistic and control groups. These results suggest that both autism and atypical are related with the abnormality of serotonergic system, and the high 5-HT level is related with the symptom of abnormal auditory responsiveness in children with infantile autism.

차별적 우위전략에 따른 목표고객의 설정 - ㈜하이트맥주를 중심으로 -

황성윤,김찬곤,김이학 東國專門大學 2002 金龜論叢 Vol.9 No.1

마케팅의 전략 중 STP(세분화, 표적화, 위치화)의 전략은 어떤 상품이든 기업의 성장과 발전을 위해서는 중요한 하나의 기업 이슈이다. 더구나 뚜렷이 구별되는 경쟁사와의 차별이 구별되는 경쟁사와의 차별적 우위를 누리기 위해 기업이 지향하는 모든 마케팅적 노력은 어떤 경우에나 그 중요성을 인정받고 있을 것이다. 그리하여 본 연구는 현실적 STP 전략에 있어서 특정 맥주의 타사와의 차별적 우위를 가지는 내용 중, 특히 목표고객의 설정을 중심으로 고찰하였다. 그런 과정에서 이론적 바탕을 근거로 현실적으로 이것이 어떻게 응용되고 있는 지, 또 기업은 실제로 여러 이론들을 어떤 방법으로 이를 현실에 접목시키고 있는 지를 구체적으로 살펴보려 하였다. 이에 '하이트'라는 이름의 상품을 탄생시키기 위해 기업이 수행한 여러 가지 분석 기법들, 예컨대 SWOT분석, 표적시장의 선정과 포지셔닝 전략, BCG 포트폴리오 매트릭스를 이용한 경쟁력의 분석, 신제품개발에 따른 4P 전략, 시계열 분석 등을 두루 섭렵하였다. 그 결과, 무한 경쟁의 시대인 요즈음의 각 기업의 전략은, 자사의 업계 내의 위치와 그 위치에 따른 세분화된 차별화 전략이 필요할 것인 바, 이에 자사 내의 성장요인에 지나치게 집착하는 활로의 모색보다는 경쟁업체와의 차별화 항목별 비교·분석을 통한 경영활동이 더욱 효율적이라는 것을 밝혔다. 요컨대, 이와 같은 사례연구를 통해 경영활동의 효율화는 물론 성과측정을 위한 효율적인 노력을 경주함으로써 더 나은 기업활로의 모색이 가능할 것으로 보인다.