유기산염 열분해법에 의한 Mn-Zn Ferrite 분말의 합성

곽재은,이완재 한국분말야금학회 1998 한국분말야금학회 학술대회논문집 Vol.1998 No.1

열화상카메라를 이용한 야구 투구 동작 시 인체 피부온도의 변화에 대한 실험 연구

곽재은,황동현,최강선,김정배 사단법인 인문사회과학기술융합학회 2019 예술인문사회융합멀티미디어논문지 Vol.9 No.7

Previous studies have not been able to provide data such as which muscles have the highest skin temperature, what the temperature distribution is, and how the difference between humans is quantitative in the same manner as the pitching of a baseball. In this study, we tried to analyze the results quantitatively. As a first preliminary experiment, we performed an experiment to determine whether the difference in skin temperature according to the degree of use of muscles occurred. In the case of the right arm, it was found that the maximum temperature increased by 0.7 ℃ compared with the maximum value. In the case of the left arm, it increased by 0.5 ℃ only. In addition, in experiments using a full backpack to check the response characteristics of individuals to the temperature when loads are exerted on the human body from outside, not muscle activity, the temperature distribution of the skin changes according to the distribution characteristics of the load quantitatively. In the experiment of pitching motion, the skin temperature change characteristics of the arm muscles according to the number of pitches were quantitatively analyzed by measuring the arm temperature after the initial and every 10 times of pitching using the thermal camera. Through the experiments, a significant difference in the temperature rise could occur and the difference in muscle use area was clearly confirmed. 특정 종목인 야구의 투구 동작에서는 어떤 근육 부위의 피부온도가 가장 높으며, 온도 분포는 어떻게 되며, 사람들 간의 유의차는 정량적으로 발생하며 어느 정도인지와 같은 결과를 이전의 연구들은 제시하지 못하고 있다. 이에 본 연구에서는 그러한 결과를 정량적으로 분석 제시하고자 하였다. 이를 위해 기초 실험으로서 근육의 사용량에 따른 피부온도의 변화가 발생하는지를 확인하기 위한 실험을 양팔 이완-긴장 상태의 반복으로 수행하였고, 결과 분석을 통해 근육 사용량과 피부온도의 변화의 관계를 확인하였다. 이완-긴장을 반복하면 점차적으로 피부온도가 증가함을 확인하였고, 오른팔의 경우에는 초기 최대 피부온도 보다 이완-긴장의 반복을 통해 최대 0.7℃가 증가, 왼팔의 경우에는 0.5℃만 증가함을 확인할 수 있었다. 또한 직접적인 근육 활동과 달리 인체에 하중이 주어질 때 사람들의 피부온도의 반응 특성을 가득 찬 백팩을 이용하여 실험을 수행하고, 하중의 특성에 따라 피부 온도 분포의 변화가 발생함을 확인하였다. 투구 동작 수행 반복 실험에서는 투구 횟수별로 팔 근육의 피부 온도 변화 특성을 열화상카메라를 이용하여 초기와 매 10회 투구 후(최대 100회 투구)에 팔 온도를 측정하여 정량적으로 분석하여, 동일한 투구 동작을 수행하는 사람들 사이의 피부 온도 상승의 정량적인 유의차가 발생할 수 있음을 그리고 근육 사용 부위의 차이를 명확하게 확인하였다.

초미립 Mn_xZn_1-xFe₂O₄(x = 0.69~0.74)분말의 제조 및 자기적 성질

곽재은,이완재,Kwak, Jae-Eun,Lee, Wan-Jae 한국분말야금학회 2002 한국분말재료학회지 (KPMI) Vol.9 No.6

$MnxZn_{1-x}Fe_2O_4$ (x=0.69~0.74) powders synthesized by the thermal decomposition of organic acid salts. The obtained powders were uniform in composition and ultra-fine particle with about 400 nm. The amount of spinel phase of these powders was about 50% in X-ray diffraction patterns. The calcination of powder was carried out at $900^{\circ}C$ for 2 hours in air. After the powders were calcined. the mean size of powder was about 500 nm and the amount of spinel phase was increased over about 65%. The maximum amount of spinel phase was about 75% in the specimen of X=0.72. The magnetic properties of calcined $Mn_{0.72}Zn_{0.28}Fe_2O_4$ powders were the best among the different among the different compositions.

당귀와 콩나물의 생체 신호 측정 실험 연구

곽재은,황동현,임하은,김정배 사단법인 인문사회과학기술융합학회 2019 예술인문사회융합멀티미디어논문지 Vol.9 No.1

In order to measure the bio-signal of the plant, an electrode capable of measuring the microvoltage in the plant, unlike the conventional method, is placed on the stem of Angelica-gigas and on the stem, root and head of the edible vegetable bean sprouts directly inserted. Angelica-gigas and Bean sprouts were experimented while growing indoors while supplying solutions containing water and new materials provided by Dasan Pharmaceutical. As a result of the experiment, it was shown that both Angelica and bean sprouts fed with the solution showed a relatively high potential difference (size of the biological signal), which was measured at the surface temperature of the leaves and in the stem of the bean sprouts It was confirmed that the temperature of the leaves and bean sprout stem fed with the solution over the entire time were maintained at a high level. These results show that the internal temperature of the plant is maintained at a high level when the biological signal is high, as in the previous research results. 식물의 생체 신호를 측정하기 위하여 연구진들이 개발한 방법으로 식물 내의 미세 전압을 측정할 수 있는 전극을 한방 약재로 많이 이용되고 있는 당귀(Angelica-gigas)의 줄기에 그리고 식용 작물인 콩나물(Bean sprouts)의 줄기와 뿌리 및 머리부분에 직접 삽입하여 측정하였다. 당귀와 콩나물은 물과 다산제약에서 제공한 신물질이 포함된 용액을 투입 공급하면서 실내에 위치시킨 당귀는 화분에 콩나물은 배양조에서 키우면서 실험을 수행하였다. 장기간에 걸쳐 진행된 실험 결과 용액을 공급한 당귀와 콩나물 모두 상대적으로 높은 전위차(생체신호의 크기)를 나타내었고, 이는 열화상카메라로 측정된 시간에 따른 당귀의 경우에는 잎의 표면온도에서 그리고 콩나물의 줄기에서의 표면온도에서 전체 시간에 걸쳐 용액을 공급한 당귀의 잎과 콩나물 줄기 온도가 조금이라도 높은 상태를 유지하고 있음을 확인하였다. 이러한 결과는 이전 연구결과와 동일하게 생체신호가 높으면 식물의 내부온도가 다소 높은 상태를 유지하고 있음을 확인할 수 있었다.

치약제 및 구중청량제의 품질 실태 조사 및 안전성 평가

곽재은,박원희,류회진,한진,최정은,김성단,황인숙,신용승 한국분석과학회 2023 분석과학 Vol.36 No.6

The quality of the products was investigated by analyzing fluorine content, pH, preservatives and tar colors in 31 dentifrice products (6 items for children) and 15 mouthwash products (2 items for children) marketed. It was intended to provide correct information to consumers by checking whether the standards and product indications match. As a result of measuring the fluoride concentration, 26 dentifrice and 15 mouthwash products contained from 48 to 1,472 ppm and from 85 to 225 ppm, respectively. Fluorine detection rates of dentifrice and mouthwash products were 83.9 and 83.3 %, respectively showing similar levels. Of the 41 fluoridedetected dentifrice and mouthwash products, 40 were 90.7~109.8 % of the displayed amount and suitable for the fluorine content standard of 90.0 to 110.0 %, but one dentifrice was found to be inappropriate at 36.3 % of the content indicated on the product. The pH of the dentifrice was 5.1~9.4, and the mouthwash was 4.2~6.2, which met all standards. As a result of simultaneous analysis of the concentration of six preservatives, benzoic acid was detected the most in 15 cases with a 30.6 % detection rate, sorbic acid was detected in 9 cases (detection rate of 18.4 %), and all four types of methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, propyl phydroxybenzoate, butyl p-hydroxybenzoate were not detected. As a result of analyzing the concentration of 10 types of tar colors, six types including red40, yellow4, yellow5, yellow203, green3, and blue1 were detected in a total of 9 cases (2 dentifrices and 7 mouthwashes) with blue1 being the most frequently detected. Detected fluorine concentration, added preservatives and tar colors were consistent with the product markings and it was well written on product packaging. The detected preservatives and tar colors were at a safe level due to low risk compared to Acceptable Daily Intake.

A study on exposure to 5 preservatives according to the air fresheners and deodorants use

류회진,곽재은,한진,최정은,김성단,이명숙,황인숙,신용승 한국분석과학회 2023 학술대회논문집 Vol.2023 No.5

1985년부터 2014년까지 대구의 측정 수평면전일사량과 기상 데이터의 경향 및 상관관계 분석 연구

조민철,임하은,곽재은,강준모,황동현,김정배,Cho, Min-Cheol,Lim, Haeun,Kwak, Jae-eun,Kang, Jun-Mo,Hwang, Dong-Hyun,Kim, Jeongbae 한국교통대학교 융복합기술연구소 2017 융ㆍ복합기술연구소 논문집 Vol.7 No.2

At present, the Korea Meteorological Administration (KMA) measures the horizontal solar irradiation and meteorological data with time in 33 areas. Among these measured data, this study analyzed the tendency of applying the new analysis method by using the horizontal solar irradiation and meteorological data with the time which was measured in many regions across the country for thirty years from 1985 to 2014. The method applied to the analysis is to compare the value of the annual total horizontal solar irradiance and meteorological data for one year with the value of those for the previous year of each year, and give +1 when it is higher, and -1 when it is lower. The characteristics and relationships the horizontal solar irradiation and meteorological data in Daegu were evaluated and analyzed. Through the analysis results, the analysis method applied in this study could be well describe the characteristics and relationships of the solar irradiance and meteorological data during some years.

팔당호 수질개선에 대한 소비자 지불의사액 추정

조용성,김봉구,곽재은 한국환경경제학회 한국자원경제학회 2001 자원·환경경제연구 Vol.10 No.3

The water quality of Paldang reservoir now grades the third class water based on COD criterion, meaning that it is no longer suitable for drinking. This study attempted to estimate the economic value of water quality improvement in Paldang reservoir using CVM. The survey used payment card format to measure the willingness to pay of the questionnaire respondents for the improvement of water quality and also factors that affect the WTP. The survey showed that men rather than women, those had higher income and paid more water supply charges, those who lived in the area for a shorter period of time, those who do not use city water for drinking, had willingness to pay more. The WTP was estimated 4,952 to 5,497 won on a monthly average. The economic value of the improvement of the water quality of Paldang reservoir was estimated between 344.2∼382.1 billion won on an annual basis.

팔당호 수질개선에 대한 소비자 지불의사액 추정

김봉구,조용성,곽재은,Kim, Bong-Koo,Cho, Yongsung,Kwak, Jae Eun 한국환경경제학회 2001 자원·환경경제연구 Vol.10 No.3

The water quality of Paldang reservoir now grades the third class water based on COD criterion, meaning that it is no longer suitable for drinking. This study attempted to estimate the economic value of water quality improvement in Paldang reservoir using CVM. The survey used payment card format to measure the willingness to pay of the questionnaire respondents for the improvement of water quality and also factors that affect the WTP. The survey showed that men rather than women, those had higher income and paid more water supply charges, those who lived in the area for a shorter period of time, those who do not use city water for drinking, had willingness to pay more. The WTP was estimated 4,952 to 5,497 won on a monthly average. The economic value of the improvement of the water quality of Paldang reservoir was estimated between 344.2~382.1 billion won on an annual basis.

2005년부터 2014년까지 전국 18개 지역의 측정 수평면전일사량의 경향 분석 및 분석 방법 소개

조민철,임하은,곽재은,강준모,황동현,김정배,Cho, Min-Cheol,Lim, Haeun,Kwak, Jae-eun,Kang, Jun-Mo,Hwang, Dong-Hyun,Kim, Jeongbae 한국교통대학교 융복합기술연구소 2017 융ㆍ복합기술연구소 논문집 Vol.7 No.1

At present, the Korea Meteorological Administration (KMA) measures the horizontal solar irradiation with time in 33 areas. Among these measured data, this study analyzed the tendency of applying the new analysis method by using the horizontal solar irradiation with the time which was measured in 18 regions across the country for ten years from 2005 to 2014. The method applied to the analysis is to compare the value of the annual total horizontal solar irradiance for one year with the value of that for the previous year of each year, and give +1 when it is higher than the reference ratio, 0 if it is within the reference ratio, and -1 when it is lower than the reference ratio. The characteristics of each region and nationwide characteristics according to the change of each reference ratio were evaluated and analyzed. Through the analysis results, the analysis method applied in this study could be well describe the characteristics of the solar irradiance during some years.