• 한국학교보건학회지
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• 제19권2호
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• pp.75-88
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• 2006

Purpose : This study are the secondary data of Global Youth Tobacco Survey(GYTS) developed by the WHO and United State Center for Disease Control(CDC) and Prevention to trace tobacco use among youth in youth in countries across the world. This study was carried out to serve for a basis for antismoking campaigns and to prevent adolescents from smoking by analyzing the smoking by analyzing the smoking realities factors. Methods : This study is a cross-sectional school-based survey, which employed a two-stage cluster sample design to produce a nationally representative sample of middle school students aged 13 to 15 years olds. Seventy-five schools were selected. All schools containing grade 1, 2 and 3 that contained 40 or students were included in the sampling frame. Results : The results of this study were as follows ; 1. The proportion of smoking students in middle school was 6.4% and the rate of smoking in male students(7.4%) was higher than it of in female students(5.5%). 2. 26.5% of all respondent had a experience to try smoke and the results showed that the rate of trying smoking in male students was increased by grade more than female students. 3. According to test of significance in regression analysis, the independent variables such as sex, school grade, smoking parents, friends distinction, pocket money and others showed statistical significance. 4. There was a statistical significance between smokers and nonsmokers in proportion to the completing the preventive education for nonsmoking(p=0.0023) and the acquirement of knowledge on smoking(p<.0001). 5. Finally there was a statistical significance between the exposure to anti-smoking campaign(p=0.0053) and tobacco advertisement in the mass media and the smoking(p=0.0036). Conclusion : All things considered, the health education for tobacco control in school need to be developed from an elementary school. I suggest that prevent smoking program in school need to be revitalized and be made more accessible for everyone who wish to quit. And the government should develop the regulation on total banning promoting cigarette advertising and smoking scene in the movie for young people.

• 한국균학회지
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• 제19권4호
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• pp.285-291
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• 1991

여천공단(工團)으로부터 배출되는 오염물질중(汚染物質中) 이산화유황이 공단(工團) 주변(周邊)의 느타리버섯 재배에 미치는 영향(影響)을 조사(調査)한 결과(結果) 광양 승주 지역에는 느타리버섯 재배(栽培) 기간중(期間中) 100-2700 ppb 의 이산화유황이 수시로 내습하여 자실체(子實體) 생육(生育)에 심(甚)한 피해(被害)를 주었다 . 자실체(子實體)의 생육초기(生育初期)에 300 ppb 이상의 이산화유황에 노출되면 갈변고사(褐變故死)하고 성숙(成熟)한 자실체(子實體)는 버섯의 색택이 청갈색(靑褐色)으로 변색하고 심할때는 사멸(死滅)하였다 . 생육(生育)을 계속한 버섯도 식용(食用)할 수 없거나 상품(商品) 가치(價直)를 상실하였다 . 이산화유황의 피해증상(被害症狀)은 이산화유황이 검출(檢出)된 1일후(後) 부터 발생(發生)하였고 자실체(子實體)의 피해정도(被害程度)는 이산화유황의 농도(濃度)에 따라 달랐고 춘기재배(春期栽培)가 추기재배(秋期栽培)보다 높았고 이것은 이산화유황의 내습빈도와 관련이 있었다 . 느타리버섯 자실체(子實體) 및 배지중(培地中)의 S 함량은 피해지역과 비피해지역간 , 피해버섯과 정상 버섯간에 큰 차이(差異)를 보이지 않았다.

• Korean Chemical Engineering Research
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• 제44권1호
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• pp.92-96
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• 2006

유기용매에서 효소를 이용하면 다양한 선택적 반응을 쉽게 수행할 수 있어 산업적 적용 가능성이 매우 높지만, 효소의 안정성 저하는 아직까지 큰 문제 중의 하나로 남아있다. 유기용매에서 효소 반응시 효소의 실활 원인과 효소의 안정화 방법 연구를 위하여 단백질의 folding에 관여하는 molecular chaperone의 일종인 heat-shock protein Hsp90을 이용하여, 대표적인 유기용매 반응시스템에서의 과산화효소 HRP 안정성 향상 연구를 수행하였다. 그 결과 Hsp90은 30％ DMSO, 30％ 및 50％ dioxane 완충용액에서 HRP의 실활 방지 효과를 보였고, 실활된 효소의 재생에도 탁월한 효과를 보였다. 그리고 형광분석과 CD(circular dichroism)에 의한 구조분석을 수행하여 Hsp90이 유기용매에 의해 unfolding되어 있는 효소를 다시 refolding하는 데 기여함을 알았다.

• 대한지역사회영양학회지
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• 제15권5호
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• pp.679-686
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• 2010

The purpose of this study is to monitor genetically modified bean sprouts at traditional markets in Seoul and to investigate perception of traditional market merchants and high school students on genetically modified organisms (GMOs). We analyzed 30 bean sprouts that were selected at 11 traditional markets in Seoul using the method of polymerase chain reaction (PCR). Also, we compared perception of GMOs between merchants (n = 30) and students (n = 126). Knowledge test about GMOs was performed by students. The result of PCR, 16.7% of bean sprouts were confirmed as GM bean sprouts (n = 5). Students had significantly more exposure to information about GMOs than merchants (p < 0.05). Major information sources about GMOs were from mass media (television, newspaper and radio). About half of subjects were not aware that they eat GMOs and GMOs are sold to consumers. Only 17.3% of subjects had constant eating intent for GMOs after perceiving foods that he/she usually eats are GMOs. 51.3% of subjects had willingness to purchase GMOs if GMOs have same quality and lower cost than natural foods. 37.2% of subjects thought that GMOs would be harmful to humans. Students had more positive perception of GMOs' side effects than merchants (p < 0.01). There was no merchant who knew labeling of GMOs. 19.1% of students knew labeling of GMOs. Students' mean percentage of correct answers of six questions about GMOs was 45.2%. Therefore, providing adequate information about GMOs is needed for consumer's choice whether to purchase GMOs or not.

• 한국수산과학회지
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• 제37권3호
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• pp.209-214
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• 2004

A method for rapid acute toxicity test based on temperature control of Ceriodaphnia dubia has been developed and evaluated. A new toxicity test based on temperature control (TTBTC) which are based on temperature control, was developed and compared for the adsorption of the better methodology for short-term toxicity screening. Initially, daphnid larval are exposed to toxicants and at the same time the temperature of the water bath containing media is increased to high temperature $(35.5^{\circ}C).$ After 1.25 hrs of contact time, the number of the daphnids, either living (no toxic effect) or dead (toxic effect), is counted by the naked eyes. Effect of exposure time on test sensitivity was not significantly different between 1 to 1.5 hr. Comparison of the rapid 1.25 hr acute toxicity test developed in this study and the standard 48 hr acute toxicity test using heavy metals, cyanide and pentachlorophenol indicated that the 1.25 hour test provides an acceptable level of sensitivity in toxicity test for C. dubia.

• 센서학회지
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• 제9권6호
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• pp.424-429
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• 2000

실리콘 고무 멤브레인(membrane)에 실리콘 빔(beam)들이 삽입된 형태의 저차압센서를 개발하였다. 제작된 저차압센서는 실리콘 고무(silicone rubber)를 멤브레인으로 사용함으로써 열악한 환경에서도 다양한 응용분야에 적용 가능하도록 하였다. 실리론 고무 멤브레인을 사용한 압저항형 저차압센서는 선택적으로 도핑(doping)된 (100) n/n+/n 웨이퍼 상에 다공질 마이크로머시넝(micro-machining) 기술을 이용하여 제작되었다. 제조된 센서의 감도(sensitivity)는 $0.66{\mu}V/mmHg$이고, 0.1% 이하의 비선형성(non-linearity)을 보였다.

• 한국식생활문화학회지
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• 제16권1호
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• pp.1-12
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• 2001

The main purposes of this study are to know the contents and forms of impressions that the general public, and the consumerists and environmentalists have of irradiated food, and to know what information of irradiated food influences their impressions. Other purposes are to know what sources those impressions derive from, to know which media they have recently been exposed to and paid attention to irradiated food through, to know which sources they trust of information regarding irradiated food most greatly, and finally to suggest policies and strategies of communication in order to shed positive impressions of irradiated food on people. This study was conducted through the person-to-person interview survey toward 1,200 adults, and 150 consumerists and environmentalists in 1999. Adults are sampled nationally in South Korea. Only 8.7% of the general public have heard of irradiated food. Impressions of irradiated food that the general public mentioned most frequently are: harmful, insecure, negative, etc. The consumerists and environmentalists were found to have the most inaccurate knowledge of irradiated food. Television and newspaper were the major sources of impressions of, exposure to and focus of attention on irradiated food. Based on these results, we seem to devise methods to enhance impression of irradiated food by disseminating information of advantages and benefits that irradiation provides food with and to promote the fact that irradiation on food is totally irrelevant to being radioactive, danger of a nuclear power plant, genetically modifying food, etc.

• 대한두경부종양학회지
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• 제15권2호
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• pp.172-176
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• 1999

Background: An increasing number of traumatic, infectious, degenerative, benign, and malignant lesions of the clivus and cervical spine are treated by head and neck surgeons. Surgical techniques vary according to the exact level of the lesion. Objectives: The purpose of this article are to introduce the surgical approach and to discript our experience and to analyze the advantage of the each methods. Materials and Methods: Transpalatal approach in clivus chordoma, transoral approach in C2 fibrous dysplasia, trans mandibular approach in clivus meningioma and transcervical approach in neulilemmoma were reviewed from the medical record. Results: Postoperative complications occured. Otitis media with effusion were observed in transoral and trans mandibular approach. Cranial nerve paralysis was observed in transcervical approach. But other complications such as swallowing difficulty persisting over 6 weeks, malunion of mandible, orocutaneous fistula, hemorrhage from major vessel were not observed. Conclusion: The various surgical techniques to be described herein serve to give the best exposure of each level of the lesions. Therefore head and neck surgeon plays a major role in the treatment of lesion in the clivus and anterior cervical spine according to the lower incidence of postoperative morbidity.

• 한국해양바이오학회지
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• 제1권4호
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• pp.275-281
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• 2006

3.4-dichloroaniline (DCA)를 함유한 최소배지에서의 집식배양과 배양 후 HPLC에 의한 잔류분석을 통해 3,4-DCA의 분해 능력이 우수한 균주 Arthrobacter sp. YM-14를 여천석유화학공단 인근의 갯벌에서 분리하였다. 분리균 YM-14는 1/10 LB 배지에 함유된 50 ppm의 3,4-DCA를 12 시간 만에 완전히 제거하였다. 이외에도 분리균 YM-14는 3-chloroaniline(CA), 2,5-DCA 및 3,5-DCA의 분해 활성을 나타내었으나 2-CA, 4-CA와 2,4-DCA에 대한 분해활성을 가지고 있지는 않았다. 또한, 분리균 YM-14에서 3,4-DCA의 유도에 의한 catechol 1,2-dioxygenase 활성의 증가가 관찰되었다. 이러한 결과는 catechol 1,2-dioxygenase이 3,4-DCA 분해에 관여하는 중요한 효소군중의 하나로 생각된다.

• 수면정신생리
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• 제27권1호
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• pp.1-7
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• 2020

Mobile digital devices are very familiar and useful devices in the daily life of modern people, and are used for various tasks such as communication, reading, writing, and playing media. As the use of mobile digital devices has become more prevalent, user time has also been increasing. In particular, the number of people who use digital devices before sleep is growing. The light pollution associated with these devices is classified into four categories: urban sky glow, glare, light trespass, and clutter. The pattern in which modern people use digital devices corresponds to light pollution caused by light trespass and clutter from light exposure to artificial light at night. The light pollution caused by digital devices can cause melatonin secretion suppression, delayed sleep onset, reduction of sleepiness before bedtime, and periodic rhythm and cognitive function disturbances. In addition, a study of children and adolescents showed there may be disturbances in the sleep-wake cycle and circadian rhythm, deterioration of sleep quality, and daytime fatigue due to light pollution caused by artificial light at night from mobile digital devices. A multi-faceted research effort is also necessary to investigate the healthy use of mobile digital devices based on research evidence and insights with an accurate evaluation of the influence of mobile digital devices as a form of light pollution.