• 한국자동차공학회논문집
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• 제6권5호
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• pp.199-210
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• 1998

The skill that utilizes atomization of the liquid has been widely used in the field of industry and engineering. Though there are dozens of methods to make atomization, the pressure type injection nozzle is frequently used in washing of parts, pastourization and painting because it has relatively simple system. This study is to reveal the characteristics of atomizing formed by three different types of the pressure type injection nozzle. We measured velocity and diameter of droplet to compare and analyze characteristic of each nozzle. In case of velocity, atomization of hollow-cone nozzle is irregular than others and change of radial direction is especially large. Atomization of flat nozzle is nearly uniform. In case of diameter, atomization of hollow-cone nozzle is increased rapidly, as measurement point become more distant from the center of nozzle. Atomization of flat nozzle has the most fixed magnitude. Accordingly, full-cone nozzle can be used irrespective of the form of subject and hollow-cone nozzle is proper to the occasion to spray large and smooth subject. Also, flat nozzle is proper to the occasion to spray a part of subject and long groove.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.696-700
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• 2007

In case of dome-typed gymnastics training floor, since its form takes shape of the focus of sound, in the occasion when the finishing-material was used with the sandwich panel that prominent in reflexibility, and because the reverberation of sound in indoor is too loud, a smooth practice and teaching is very difficult. As this indoor gymnastics training floor, standing at its character, is required simultaneously the idea communication between the player and the coach, and the acoustic capability regarding to the clearness of music, besides the sport activity, the method to minimize the acoustic defect should be urgently contrived from the stages of design and beginning of construction. On this viewpoint, after investigation on the confidence of the surveyed value and the estimated value using acoustic simulation, and use of the changed finish-material, this thesis intends to design the dome-typed gymnastics training floor that secured the optimized acoustic condition. It is also considered that such result of the study could be utilized as the useful data that enables to improve the retrenchment effect of the construction cost as well as the acoustic performance, by means of the prediction control on the acoustic problem from the stage of design, for the occasion when the similar indoor sport gymnasium is planning to build for the near future.

• 응용통계연구
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• 제6권1호
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• pp.145-162
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• 1993

본 논문에서는 반복적 계속 표본조사에서 일부의 표본을 교체하는 2회 계속조사의 표본 추 출법들을 요약하고 앞 조사시기의 관찰값을 확률측도로 이용한 RHC(Rao-Hartley-Cochran) 유형의 불균등 확률추출법을 제안하였다. 제안된 추출법과 기존의 확률추출법의 비교를 위 하여 둘째 조사시기의 모평균 추정량과 그의 분산을 유도하였으며, 제안된 추출법의 상대 효율은 이론적인 측면과 수치적 시뮬레이션 방법으로 비교 분석되었다. 시뮬레이션 비교를 위하여 한 특별한 시계열 모형을 가정하고 이를 사용하여 인위적인 모집단을 생성하였으며 이 모집단에서 각 추출법에 해당되는 표본을 컴퓨터로 추출하여 각각의 추정치를 계산하여 비교한 결과에서 RHC 유형의 새로 제안된 추출법의 분산과 편차가 일반적으로 적음을 보 였다.

• 대한가정학회지
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• 제33권4호
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• pp.279-288
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• 1995

The purpose of this study was to compare clothing attitude and clothing purchase behavior of two age groups of adult men,- college students and middle aged. Four aspects of clothing attitude (fashion interest, status symbol, conformity, practicality/comfort) were assessed with 20 Likert type questionnaires adapted from the previous researches. Four aspects of purchase behavior(information sources used, store patronage, importance of store attributes, clothing selection creteria for occasions) were measured with forced choice questionnaire developed or adapted from previous researches. The questionnaire were administrated to 512 male college students and middle aged men. The data were analysed using frequency, percentage, and t-test. The major findings drawn from this study were as follows : 1. Clothing comfort among four aspects of clothing attitude according to the age group was that middle-aged men showed higher conformity than college students. 2. For the information source for apparel purchase, college students used consumer dominated information source while middle-aged men used market dominated information source. 3. For apparel purchase, students preferred brand franchise store, and factory outlet/off-price store, while middle-aged preferred department store and custom-made. Among six store attributes, convenience and price were the most important attributes to the students, while convenience and high quality to the middle aged. 4. The most important clothing selection creteria for formal occasion (job interview, wedding ceremony) was dignity. Comfort/practicality were important creteria for both of leisure occasion and daily attendance (office, school).

• 복식
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• 제31권
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• pp.47-60
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• 1997

As we analyzed the formalities of court dress during King Soonjo's rule through the characters depicted in $\boxDr$Wangseja Chulgungdo$\boxUl$(The Painting for a Crown Prince's Outgoing for Schooling to Sungkyunkwan) the results were as follows: People wore their appropriate full dress ac-cording to the ceremonial procedures. In the case of a Crown Prince normally the wore Gongjungchaek(a hat) (after the coming-of-age ceremony Iksunkwan) and Gonryongpo(imperial clothes) to show his status as a Crown Prince. He wore chugkumbok(a Coat) to indicate a Crown Prince as being a student. on an occasion of celebration a Crown Prince wore Wonyugwan and Gangsapo to provide him with prestige and as a sign of respect for the occasion. The teacher of a Crown Prince also wore Gongbok and Sangbok accoding to the dress requirements of the ceremonies. We can confirm that the Gongbok system of all government officials had been main-tained in the late Chosun dynasty. We know that the form of ceremonies be-came simplified in the late Chosun dynasty. it was recorded that students had to wear Chungkumbok. but we knew from the painting that students actually wore Dopo(a traditonal korean coat). We knew through this painting that the court dress rules of the late Chosun dynasty varied that previously known. As we concluded above research on the his-tory of costume by analyzing paintings both supplements our knowledge of the topic and confirms the deficiency in the study of the his-tory of costume based solely upon literature and books.

• 대한가정학회지
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• 제43권3호
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• pp.27-43
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• 2005

The purpose of this study was to determine the drinking behaviors and drinking problems of adult, mentally retarded persons over 18 years old. It was also investigated whether gender, age, and pattern of employment create different result of drinking behaviors and drinking problems, and the variables explaining drinking problems were analyzed. One hundred forty adults, mentally retarded persons were surveyed in Seoul and KyeongGi area. The major findings were as follows; The majority of respondents ($58.2\%$) reported that they had consumed alcohol beverages sometimes prior to their having been interviewed. The average age of respondents who had consumed alcohol was 26.4 years and average age of first-use of alcohol was 22 years. For consumption frequency, $39.2\%$ of respondents reported that they drink alcohol once a month. Average alcohol consumption per occasion was 1.5 cups, and $10.9\%$ of respondents answered more than 5 cups per occasion. Regarding problems associated with drinking, $16\%$ of respondent of AUDIT and $51.4\%$ of Family CAGE answered that their children have drinking-related problems. Men drink more than women and experience more alcohol problems. Supervised employment group was the group with the greatest prevalence for drinking. For the amount of drinking, gender and employment pattern showed significant differences. Drinking problems (AUDIT and Family CAGE) of adult, mentally retarded persons were influenced by age of first-use of alcohol, frequency of alcohol use, and alcohol consumption.

• 한국국방경영분석학회지
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• 제26권1호
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• pp.89-99
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• 2000

This paper deals with a heuristic algorithm for the vehicle routing-scheduling problem to minimize the total travel distance and the total cost. Because the aim of the Clarke-Wright method, one of famous heuristic methods, is to minimize the total travel distance of vehicles, it cannot consider the cost if the cost and the travel distance is not proportional. In the Clarke-Wright method, the route of each vehicle is found by using the saving matrix which is made by an assumption that the vehicle comes back to the starting point. The problem dealt with in the paper, however, does not need the vehicle to come back because each vehicle has its hoping-start-points and hoping-destination-points. Therefore we need a different saving matrix appropriate to this occasion. We propose a method to find an initial solution by applying network simplex method after transforming the vehicle routing-scheduling problem into the minimum cost problem. Moreover, we propose a method to minimize the total travel distance by using the modified saving matrix which is appropriate to no-return occasion and the method for the case of plural types of vehicles and freights.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.46-51
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• 2006

In order to utilize the refrigerants condensation heat of condenser on the absorption chiller system, the solution cooling condenser(SCC) were proposed, which weak solution of absorber outlet use as a cooling water. As the UA of the solution cooling condenser increased, increasement of COP is about maximum 0.09 in occasion of single effect and is about maximum 0.08 in occasion of double effect series flow. In the case of heat exchanger efficiency is about 0.85, it's increments are 0.08 and 0.072, each. And solution cooling condenser is a more effective device in the single effect absorption system more than double effect system for the principle of operation. In order to increases the heat of solution cooling condenser, if reduce the flow rate of cooling water or the value of UA, it makes COP increase a little, but it brought COP decrease because of increasing the pressure of system.

• 유통과학연구
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• 제19권2호
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• pp.53-64
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• 2021

Purpose: Even though arranging images of products is a common practice in the online retail context, relatively little attention has been paid to the distance effect among alternatives, that is, how distance among displayed products can impact consumers' responses. Drawing on contagion theory, the primary goal of the current study is to investigate how spatial distance between two products in a product display can influence consumers' perceived similarity. Research design, data and methodology: This study used a 2(spatial distance: close vs. far) experimental design and collected data from undergraduate students in Korea through an online survey using Qualtrics. ANOVA was conducted to test the proposed effect, in which the dependent variables are the perceived similarity of usage occasion/purpose (Study 1) and the indexed differences of perceived brand statuses between two products (Study 2). Results: The results of both experiments indicated that the displayed products were perceived to be more similar to one another when products were presented close together (vs. far). Conclusions: The results help to fill a research gap and provide a better understanding of the role of physical distance in diverse marketing communications. This is especially useful when designing online shopping websites to form perceptions of brand images.

• 천문학회지
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• 제56권2호
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• pp.137-147
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• 2023

Shoushili was the official calendrical method promulgated in 1280 CE by the Yuan dynasty. It contains a list of the angular spans in right ascensions for the 28 lunar lodges. They are known to have been measured by Guo Shoujing with his advanced instruments with an unprecedented precision or reading error of 5'. Such precise data are useful to determine their observational epoch with an error range which is narrow enough to pinpoint on which historical occasion they were observed. Using the precise SIMBAD data based on eDR3 of GAIA and carefully identified determinative stars and considering the precession of equinoxes and proper motions, we apply linear regression methods to those data and obtain the observational epoch of 1271 ± 16 CE and the measurement error of 4.1'. We also have polar distances corresponding to declinations written in another manuscript of the Ming dynasty. Since the two data sets have similar significant digits, they were suggested to have the same origin. However, we obtain their observational epoch of 1364±5 CE and the measurement error of 5.7'. They must have been measured with different instruments and on a different occasion from the observations related to Shoushili. We review the history of the calendrical reform during the 13th century in the Yuan dynasty. We conclude that the observational epoch obtained from lodge spans in Shoushili agrees with the period of observations led by Guo Shoujing or 1276-1279 CE, which is also supported by the fact that the ecliptic lodge span values listed in Shoushili were calculated from the equatorial lodge spans.