합성고무계 건축용 방수제

최세영,Choi, Sei-Young 한국고분자학회 1997 고분자 과학과 기술 Vol.8 No.6

나카가미 페이딩 체널에서 일반화된 선택성 다이버시티를 사용한 MPSK 신호의 평균 심벌 오류 확률

최세영,윤동원,한영열,Choi, Se-Yeong,Yoon, Dong-Weon,Han, Young-Yearl 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.6

본 논문에서는 동일한 평균 전력을 가지며 주파수 비선택적 느린 나카가미 m-분포의 페이딩을 겪는 MPSK 신호들에 대한 다수의 다이버시티 가지 중 크기가 센 두세개의 신호를 순서대로 선택하고 합성하는 일반화된 선택성 합성 기법에 대한 평균 심벌 오류 확률식을 유도한다. 오류 확률식을 유도하기 위해 순서 통계량(Order Statistics)의 개념을 적용한다. 유도 과정에서 수신 신호의 확률 밀도 함수에 대한 새로운 전개가 소개되고 있으며, 다양한 수학적 기법들을 사용한다. 기존의 선택적 합성과 최대비 함성 기법과의 성능을 비교하여 적절한 다이버시티 가짓수를 찾는다. In this paper, a new closed form expression for the average symbol error rate(SER) of generalized selection combining(SC), whereby the two(three) signals with the two(three) largest amplitudes are combined from the original diversity branches in the channel, for MPSK signals in a frequency-nonselective slowly m-distributed Nakagami fading channel is derived. In order to analyze the error performance for a generalized SC, the Order-Statistics is applied. To derive the SER of MPSK signals with SC, the new expression of pdf is introduced and many other mathematical methods are used. Comparing the derived SER with that of MRC, we find adequate diversity branch number from total Lth-order diversity branches.

Arachidonic Acid Ingibits Norepinephrine Release through Blocking of Voltage-sensitive $Ca^{2+}$ Channels in PC12 Cells

최세영,박태주,최준호,김경태,Choi, Se-Young,Park, Tae-Ju,Choi, Jun-Ho,Kim, Kyong-Tai The Korean Society for Integrative Biology 1997 Korean journal of biological sciences Vol.1 No.1

We studied the mechanism of arachidonic acid on the secretion of a neurotransmitter in rat pheochromocytoma PC12 cells. Arachidonic acid inhibited the 70 mM $K^+$-induced secretion of norepinephrine. Arachidonic acid also inhibited the 70 mM $K^+$-induced $Ca^{2+}$ mobilization which is due to the opening of the voltage-sensitive $Ca^{2+}$ channels (VSCC). Both the half maximal inhibitory concentration ($IC_{50}$) of the norepinephrine secretion and VSCC coincided at 30 uM. The major oxidized metabolites of arachidonic acid, prostaglandins did not mimic the inhibitory effect of arachidonic acid. Nordihydroguaiaretic acid (NDGA) and indomethacin which are inhibitors of lipoxygenase and cyclooxygenase, respectively, did not block the inhibitory effect of arachidonic acid. The results suggest that arachidonic acid serves as a signal itself, not in the form of metabolites. The pretreatment of various $K^+$ channel blockers such as 4-aminopyridine, tetraethylarnmonium, glipizide, or glibenclamide also did not show any effect on the inhibitory effect of arachidonic acid. Through these results we suggest that arachidonic acid regulates VSCC directly and affects the secretion of neurotransmitters.

論文(논문) : 고속 비행체 연료공급 및 냉각계통 사례분석

최세영 ( Se Young Choi ),박수용 ( Soo Yong Park ),최현경 ( Hyun Kyung Choi ),전필선 ( Pil Sun Jun ),박정배 ( Jeong Bae Park ) 한국항공운항학회 2013 한국항공운항학회지 Vol.21 No.2

In high-speed vehicle, selection of fuel, configuration of components and cooling system are required to solve the heating issue by aerodynamic heating and inner combustion process. This subsystem consists of fuel tank, supply pump, various control valve, heat exchanger, including reactor, connecting line, adiabatic structures and insulations. In this paper, applicable fuel property is considered at flight characteristic of hypersonic vehicles. In this regard, current state of fuel/cooling system technology is identified.

체중비 추정을 위한 BMI 비만 지수의 타당성

최세영(Se Young Choi),유성은(Seung Eun Yoo),고유선(You Sun Ko) 한국체육측정평가학회 2018 한국체육측정평가학회지 Vol.20 No.2

연구의 목적은 건강한 여대생을 대상으로 통상적으로 측정해온 체질량지수(body mass index: BMI)는 체중(kg)을 신장(m)의 제곱으로 나누어 산출되는 지수이지만, BMI는 지방을 측정하는 것이 아니라 무게의 척도라 생각되어 체중비를 다르게 나타내려한다. BMI는 단지 개인의 지방을 측정하기 위해서 사용되어져서는 안 된다. 체격지수가 비만지수로 사용되는데 있어서의 타당성을 알아보고자 한다. 이처럼 BMI는 지방을 측정하는 것이 아니라 무게의 척도라 할 수 있다. 단면적은 제곱에 비례하며, 부피(무게)는 세제곱에 비례하는데 산출 지수가 제곱이 아닌 세제곱에서 모든 경우의 정확도가 유의하다면 기존 지수의 정상범위 수치 또한 변화할 수 있을 것으로 보여 지며, 체중이 키에 제곱이 아닌 세제곱의 비만 지수를 제시 할 수 있다고 할 수 있다. BMI와 PI의 비교를 통하여 체격지수가 비만지수로의 활용가능성에 대한 타당성을 확인함으로써 사람 개인에 따라 혹은 집단에 따라서도 달라질 수 있으며, 체격지수에 대한 비만평가기준을 다르게 볼 수 있다. 이같이 유용성을 더한 BMI 비만 지수의 타당한 근거를 제시하고자 한다. 본 연구의 목적을 위하여 편의방식으로 표집 된 서울소재 일반 여자대학교 여대생 350명을 대상으로 측정하였으며, 불성실한 측정이나 설문지 누락된 부분을 제외한 총 304명의 자료를 사용하였다. 신체조성 중 신장은 직접측정 하였으며 몸무게는 분석기인 InBody 720(바이오페이스, KOREA)를 사용하여 체질량지수(body mass index: BMI)를 얻었다. 기존의 BMI지수와 세제곱으로 제시한 PI의 유사성과 연관성은 상관계수(r)에 의해 타당성 산출을 검정하였고, 변수와의 관계에서 얼마나 정확하게 추정 할 수 있는지 중다회귀분석을 이용하였다. SPSS 18.0 통계 프로그램을 이용하였으며, 유의 수준(α)은 .05로 하였다. The purpose of the study was to estimate body mass index (BMI), which is usually measured in healthy college students, by dividing body weight (kg) by the square of height (m).BMI is not a measure of fat but a measure of weight. At the study level, the weight gain is assumed to be mostly related to the increase in fat (Garrow &Webster, 1985) but not at the individual level. Therefore, BMI is not expected to be used only to measure an individual 's fat, and we want to see if it is valid for the body mass index to be used as an index of obesity. As such, BMI is not a measure of fat but a measure of weight. The cross-sectional area is proportional to the square, and the volume (weight) is proportional to the cube. If the accuracy is significant for all cases in the cube where the output index is not square, the normal range value of the existing index is also likely to change,We would like to present the obesity index of cu, not squared. A comparison of BMI and PI confirms the validity of the use of the BMI as an index of obesity. Thus, if the BMI can be changed according to individuals or groups, the criteria for the body mass index can be different. For the purpose of this study, 350 female college students at Seoul Normal University were sampled. The data were collected from 304 students except for the insufficient measurement and questionnaires missing. Body mass index (BMI) was measured using InBody 720 (BioPhase, KOREA).For relevance and similarity of BMI and PI, we used the correlation coefficient (r) to test the validity of the BMI index and the PI. The SPSS 18.0 statistical program was used and the significance level (α) was set to .05.

미용취업준비자들의 취업스트레스와 대처방식 연구

최세영 ( Se-young Choi ),박효진 ( Hyo-jin Park ),장숙희 ( Suk-hee Jang ),이인희 ( In-hee Lee ) 한국미용예술경영학회 2012 미용예술경영연구 Vol.6 No.3

This study of the Unemployed beauty study jobs and jobs seeking stress coping strategies for the survey is to provide the basic data. Survey period from 25 June 2012 until 22 July 2012 a total of 28 days from the Gyeonggi-do area Beauty Academy in beauty-related qualifications to study a total of 165 students were surveyed using questionnaires. Physical stress on employment could feel that heaviness in the chest and head pain, emotional stress, overall employment of the low average stress seems to be not much. Highest average employment even before the stressful nature of the job concerned about the difficulties to be faced after a job that I could understand the future plans for employment of the stress on the job, future plans for the lowest stress is shown. Coping strategies for job stress, eating, talking, sleeping, music, shopping, friends and acquaintances to relieve stress, is shown. This study beauty preparation for employment in the area who match their job stress and coping strategies have been talking about. Target area is limited beauty prepration for employment in other areas of party work will also learn about jobs seeking stress and Coping is thought necessary. Also related to the qualifications for employment and other types of cosmetic qualifications with those who are ready to work side-by-side comparison of the Stress and Coping cosmetic preparation for employment and employability of characters coping with stress need to look exactly the way you think about the job and Beauty Now ready for stress related to their research work will be continued.

압입 시험에 의한 플라즈마 세라믹 용사코팅의 특성 평가

최세영(Se-Young Choi),채영훈(Young-Hun Chae),김석삼(Seock-Sam Kim) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-

The most controversial topics in plasma sprayed ceramic coating system are recently mechanical properties such as bond strength, cohesive strength, toughness and so on. Determination of bond strength of coatings is one of the most important problems. In the industry, the bond strength of coating system has been estimated by Pull-off test(ASTM standard C633-79), But, without a fixed jig and specimen, it is impossible to obtain the bond strength. Therefore, it is necessary to study the critical fracture load on interface of the coating by indentation test. Because the critical fracture load plays an important role in evaluating the bond strength for plasma sprayed ceramic coating system. So, we have estimated critical fracture load in plasma sprayed ceramic coating system, and it was shown that inverse relationship between the cross-section hardness of coating and the critical fracture load(Pc). In case of the high load(1㎏f, 2㎏f) in Al₂O₃+13%TiO₂, it was found that the critical point(Pco) which the coating was broken on.

30~50대 남녀 피부관리이용실태와 만족도에 관한 연구

최세영 ( Se-young Choi ),박효진 ( Hyo-jin Park ),이미정 ( Mi-jung Lee ),양지연 ( Ji-yeon Yang ),박은정 ( Eun-jung Park ),라원희 ( Won-hee La ),강유미 ( Yu-mi Kang ),조원정 ( Won-jung Cho ),김영희 ( Young-hee Kim ),김금란 ( Kum-lan 한국미용예술경영학회 2012 미용예술경영연구 Vol.6 No.1

The objective of this research is to find out actual conditions of use and satisfaction ratings of males and females from 30 to 50 years of age through questionnaires. The respondents had answered 30 pages of questionnaires from November 16thtol9thin2011, and 302 responses had been analyzed from November 28th to December 3rd in 2011. The data was analyzed using WIN SPSS 15.0. Frequency analysis is used find out the general characteristics of the respondents; Cronbach’ s a coefficient is used to check the reliability of each question; and One Way Anova is used to see the difference between males and females. There were 167 respondents in their 30s (56.3%), being the most populous age group, and the ratio of males and females were 50~50. 64.8% of the respondents were married; 64.6% were non-smokers; 61.3% did not exercise regularly; 56.3% used UV protection; 36.8% completed undergraduate education; 39.1% worked in professional fields; 33.8% earned less than 2,000,000 (KRW) per month; 61.6% invested less than 100,000 (KRW) in skin care. Females were more interested in skin care; both took care of their skin with high interests. There was no significant difference in satisfaction depending on the type of esthetics. Females in their 30s and males in their 40s and 50s preferred general esthetics, and this outcome is probably due to large differences among age groups. For medical esthetics, males showed higher satisfaction. There was no significant rise in satisfaction for franchise esthetics; females showed higher satisfaction. Satisfaction ratings for self-care varied upon the ability to deal with sanitation and information for skin care products; females show higher satisfaction. 52.3% chose 1 to 1.5 hours to be the most appropriate service length; 40.4% choose 30,000 (KRW) to be the most appropriate price; 68.5% were willing to visit professional esthetics.

고체산화물 전해전지 작동조건의 시스템 측면 영향성 분석

최세영(Saeyoung Choi),홍종섭(Jongsup Hong) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

베이비붐세대의 부양의식에 미치는 영향 : 노인 이미지와 친밀감 중심으로

최세영 ( Se-yeong Choi ),박주현 ( Joo-hyun Park ) 한국가족복지학회 2017 한국가족복지학 Vol.22 No.1

This study examines the awareness of supporting the elderly among the baby-boom generation, in relation to their image of the elderly, and whether the degree of intimacy plays a role in affecting their awareness. To collect the data, the author surveyed 243 people from the baby-boom generation who are living in either Gyeonggi, or Chungnam Province with a questionnaire that asked about sociodemographic factors, their awareness of supporting the elderly, their level of intimacy, and their image of the elderly. To analyze the data, SPSS v.23 and AMOS v.21 were implemented. The results of the study varied from each other based on the three different types of awareness of supporting the elderly: economic, emotional, and physical. First, when it comes to the economic awareness of supporting the elderly, this study demonstrated that the participant`s level of education, marriage status, and monthly income show a positive relationship. Second, when it comes to the emotional awareness of supporting the elderly, both the participant`s gender, and hometown location turned out to play a significant role. Third, the physical awareness of supporting the elderly indicated that the participant`s marriage status, hometown location, and birth order were important. Meanwhile, the use of structure equation modeling analysis showed that higher intimacy has a positive relationship with an elevated awareness of supporting the elderly. The implications of the research, which deal with the analysis of the factors, which are assumed to affect the awareness of supporting the elderly among the baby-boom generation, can be critical in constituting a policy/law to support the elderly in our society.