• 한국조경학회지
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• 제49권2호
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• pp.41-50
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• 2021

본 연구는 도시공원을 이용하는 시민을 대상으로 이용빈도에 따라 이용자를 분류하여 도시공원 이용 시 이용행태, 관리방안 및 인식 차이를 보고자 하였으며, 동일한 설문지를 사용한 2014년도와 2020년도 설문조사 결과를 이용하여 도시공원 운영 및 관리에 대한 시사점을 제시하고자 하였다. 경기도 양주시의 도시공원을 대상으로 연구를 진행하였으며, 양주시에 거주하는 시민을 대상으로 2014년에는 740부, 2020년에는 431부의 설문지 결과를 이용하였다. 공원 이용빈도에 따라 고이용, 저이용 집단으로 분류하고, 집단에 따른 인구사회학적 차이 및 공원이용방식 차이를 비교한 후, 두 집단 간에 향후 공원 관리방향에 대한 인식 차이를 해당 연도에 따라 통계적 분석기법을 활용하여 분석 및 비교하였다. 분석결과, 2014년도에는 공원의 양적 확충 및 접근성 개선이 가장 주요한 문제로 두드러졌지만, 2020년에는 양적 확대보다는 노후 시설 점검 및 개선, 다양한 프로그램 제공, 지역의 정체성을 드러낼 수 있는 테마형 근린공원 조성 등 공원운영 관리방안에 대한 관심이 높아졌음을 확인할 수 있었다. 공원관리 방향의 차이에 있어서는 고이용 집단에서 지속적 관리가 중요하다고 인식하고 있음에도 불구하고, 덜 이용하는 집단에 비해서 상대적으로 소극적으로 공원개선 활동에 참가하겠다고 응답하였으며, 이는 장기적으로 공원을 더 많이 이용하는 사람들을 어떠한 방식으로 공원관리에 참여시킬 수 있는지에 대한 논의가 필요함을 보여주었다. 본 연구는 이용빈도에 따라 이용집단을 나눠서 다른 행태 및 인식 차이를 보고자 했다는 점에서 의의가 있지만, 향후 연구에서는 다양한 변수의 조합을 통해 보다 세밀한 이용집단의 차이를 분석할 필요가 있다.

• 한국정보시스템학회지:정보시스템연구
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• 제23권1호
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• pp.139-159
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• 2014

Recently, theoretical interests in automatic uses, which can be activated without conscious intention, have been increased. According to previous studies, automatic uses are known to be determined by the strength of habit, the frequency of past uses, and emotional experiences such as cognitive absorption. Concerned on the influences of the above three factors on automatic uses, this paper suggested the following research questions: 'Which effect of cognitive absorption on automatic considering habit?' and 'Does the frequency of past uses always influence habit?'. In order to answer the research questions, this study suggested a research model which would explain the relationship among cognitive absorption, habit, and uses. Especially, cognitive absorption is formed as a moderating variable of the relationship between past use and habit, and the relationships among variables are longitudinally expanded. The suggested research model was empirically tested by surveying 175 'Facebook' users and analysed by partial least square (PLS), which showed the suggested hypotheses are significant. This results answered the research questions as followed: First, cognitive absorption moderates the relationship between habit and automatic use. Second, the frequency of past uses would not always influence the formulation of habit rather but may be influenced by habit.

• KEPCO Journal on Electric Power and Energy
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• 제1권1호
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• pp.9-13
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• 2015

Energy storage systems (ESS) can be used to provide frequency regulation services in a power system to replace traditional frequency regulation power plants. Battery ESS, in particular, can provide "fast-responding frequency regulation," wherein the facility can respond immediately and accurately to the frequency regulation signal sent by the system operator. This paper presents the development and the trial run results of a frequency regulation control system that uses large-scale ESS for use in a large power system. The control system was developed initially for the 4 MW ESS demonstration facility in Jocheon Jeju Island, and was further developed for use in the 28 MW ESS facility at the Seo-Anseong substation and the 24 MW ESS facility at the Shin-Yongin substation to provide frequency regulation services within mainland Korea. The ESS facility in Seo-Anseong substation responds to a sudden drop in frequency via governor-free control, while the ESS facility in Shin-Yongin responds via automatic generator control (AGC).

• 한국통신학회논문지
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• 제39A권2호
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• pp.109-116
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• 2014

본 논문에서는 기상 레이다의 효율적 주파수 사용을 위해 직교 파형과 간섭 제거 기술을 이용한 주파수 재사용 기술을 제안하였다. 주파수 공유로 발생한 레이다간 간섭 영향을 줄이기 위해 직교 코드 시퀀스 간 상호 상관 최대값이 가장 작은 조합으로 선택하였으며, 잔여 간섭 성분 제거를 위해 CLEAN 알고리즘을 사용하였다. 전산 모의 실험 결과 재사용 기술 적용 후에도 성능 요구 조건을 만족하는 것으로 나타남으로써 현행 S 밴드 기상 레이다의 점유 주파수 8개를 1개로 줄일 수 있어 신규 주파수 확보 가능성 제시하였다.

• Journal of Power Electronics
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• 제19권1호
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• pp.44-57
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• 2019

Recently, the use of LLCL filters for grid inverters has been suggested to give better harmonic attenuation than the commonly used L and LCL filters, particularly around the switching frequency. Nevertheless, this filter is mainly designed for constant switching frequency pulse width modulation (CSF PWM) methods. In variable switching frequency PWM (VSF PWM), the harmonic components are distributed across a wide frequency band which complicates the use of a high order filter, including LCL and LLCL filters. Recently, a confined band variable switching frequency (CB-VSF) PWM method has been proposed and demonstrated to be superior to the conventional constant switching frequency (CSF) PWM in terms of switching losses. However, the applicability of LLCL filters for this type of CB-VSF PWM has not been discussed. In this paper, the authors study the suitability of an LLCL filter for CB-VSF PWM and propose design guidelines for the filter parameters. Using simulation and experimental results, it is demonstrated that the effectiveness of an LLCL filter with CB-VSF PWM depends on the parameters of the filters as well as the designed variable frequency band of the PWM. Simulation results confirm the performance of the suggested LLCL design, which is further validated using a lab scale prototype.

• 한국의류학회지
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• 제35권7호
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• pp.801-815
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• 2011

This study examines the characteristics of marketing and customer that influence the selection of multichannel (preference/frequency of use) in the fashion retail. The subjects of this study are men and women live in Seoul/Gyeonggi province and Busan/Gyeongsangnam-do in their 20s-40s who have shopping experiences in fashion items of more than 2 shopping channels among offline stores, catalogs, and the internet. The survey period was from March to May 2010 and 411 forms were used in this survey. The data were analyzed by a reliability analysis (Cronbach's ${\alpha}$), a factor analysis, t-test and one-way ANOVA. The main results of this study are summarized as follows. First, marketing characteristics, which effect the selection of multichannel (preference/frequency of use), consist of sales promotion, service, price, merchandise, and distribution. Those have a significant influence (***p${\leq}$.001) on choosing multichannel of fashion retail. Price has a significant impact on the preference of multichannel and merchandise affect for frequency of use in multichannel shopping. Second, customer characteristics have a significant influence (***p${\leq}$.001) on the monthly average purchasing amount, shopping hours, shopping frequency, brand knowledge, and price sensitivity. Particularly, monthly average purchasing amount & shopping frequency have meaningful differences in the frequency of using multichannel; in addition, shopping hours were affected by preference & frequency of use. Price sensitivity has a greater influence on the frequency of using multichannel and brand knowledge has a greater effect on multichannel preference. Customer's information searching characteristics have main 3 factors through the use of marketing information, personal information and experience information. Application of experience information is the main factor in preference and frequency of using multichannel shopping. The customer demographic characteristics of age (*p${\leq}$.05, **p${\leq}$.01) and gender (*p${\leq}$.05) show a difference for selecting multichannel. There is no difference for marital status, average household income per month, and job.

• Nutrition Research and Practice
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• 제6권3호
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• pp.238-245
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• 2012

This study investigated the preference and intake frequency of a list of 15 commonly available high sodium Malaysian foods/dishes, dis cretionary salt use, and their possible association with demographics, blood pressures and anthropometric measurements among 300 Malaysian university students (114 males, 186 females; 259 ethnic Chinese, 41 Indians; 220 lean, 80 overweight). French fries and instant soup noodle were found to be the most preferred and most frequently consumed salty food, respectively, while salted fish was least preferred and least frequently consumed. Males had a significantly higher intake frequency of at least 6 of the salty foods, but the preference of most salty foods was not significantly different between genders. Ethnic Chinese significantly preferred more and took more frequently traditional and conventional Malaysian foods like asam laksa (a Malaysian salty-sour-spicy noodle in fish stock), salted biscuits and salted vegetable, while Indians have more affinity and frequency towards eating salty Western foods. Body Mass Index was significantly negatively correlated with the intake frequency of canned/packet soup and salted fish while waist circumference was significantly positively correlated with the preference of instant noodle. Also, an increased preference of potato chips and intake frequency of salted biscuits seemed to lead to a decreased WHR. Other than these, all the other overweight/obesity indicators did not seem to fully correlate with the salty food preference and intake frequency. Nevertheless, the preference and intake frequency of asam laksa seemed to be significant negative predictors for blood pressures. Finally, increased preference and intake frequency of high sodium shrimp paste (belacan)-based foods like asam laksa and belacan fried rice seemed to discourage discretionary salt use. In conclusion, the preference and intake frequency of the high sodium belacan-based dish asam laksa seems to be a good predictor for ethnic difference, discretionary salt use and blood pressures.

• 예술인문사회 융합 멀티미디어 논문지
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• 제9권7호
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• pp.297-306
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• 2019

본 연구는 성격 5요인을 중심으로 SNS 이용 빈도가 청소년의 스트레스에 미치는 영향과 그 연관성을 종단 연구를 통해 알아보았다. 이를 위해 페이스북을 사용하는 청소년 코호트 그룹을 대상으로 총 2회, 1년간 설문을 실시(T1-T2)하였으며, 994명의 유효한 데이터를 수집했다. 분석 결과, 페이스북 이용 빈도(T1)는 스트레스(T2)에 직접적인 영향을 미치지 않고, 여기에는 이용자 성격과 이용빈도의 상호작용이 있는 것으로 나타났다. 구체적으로 페이스북 이용빈도(T1)가 높아질수록 성격 요소 중 신경성(Neuroticism)의 수준에 따라 이용자의 스트레스 수준(T2)은 결과가 달라진다. 신경성이 낮은 그룹은 페이스북을 자주 이용할수록 스트레스가 증가하지만, 반대로 신경성이 높은 그룹은 스트레스가 감소한다. 이는 두 그룹이 사회적 지지에 대한 상이한 욕구충족의 동기에 의한 것으로 해석되는데, 신경성이 낮은 그룹은 사회적 지지에 대한 욕구가 상대적으로 약하고 페이스북을 자주 이용할수록 더 많은 갈등에 처하므로 스트레스가 증가될 수 있다. 하지만 신경성이 높은 그룹은 사회적 지지를 얻기 위한 욕구가 강하고 페이스북을 자주 이용할수록 더 많은 심리적 지지를 얻을 가능성이 크므로 궁극적으로 스트레스가 감소되는 것으로 보인다.

• 한국컴퓨터정보학회논문지
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• 제23권6호
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• pp.51-58
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• 2018

This study was conducted to investigate the relationship between drinking, smoking, meat intake, and exercise. The participants were 1,060 males and females who voluntarily responded to the survey by visiting the health promotion booth at the H Festival held in C city in 2014. Research data were collected in interview form using questionnaires on alcohol use, smoking, exercise, and meat intake. The data were analyzed by descriptive analysis, cross tabulation analysis, multinominal logistic regression after stratification of gender using the SPSS 24 program. The results of the study are as follows: Smokers had a significantly higher frequency of drinking ($x^2=163.33$, p<.001) than non-smokers. Meat intake was high when alcohol use was high ($x^2=35.13$, p<.001). The risk rates for smoking, meat consumption, and exercise related to alcohol use are as follows. The smoking was higher as the frequency of drinking increased. For men, smoking OR(odd ratio) was 6.26 (p=.001) and for women, smoking risk OR was 16.82 (p=.002). Meats intake showed a higher OR as the alcohol use increased. The OR of almost daily ingestion of meat at frequent drinking days was 4.40 (p=.002) for males and 4.52(p=.009) for females. As the frequency of drinking increased, the OR of days of exercise tended to decrease. In men, the OR was 0.36 (p=.003), the lowest in the probability of exercising more than 5 days when drinking high. In the case of women drinking less than once a week, the OR was 0.43 (p=.027), which was the lowest for exercise for 5 days or more. In conclusion, the higher the frequency of drinking, the higher the smoking and meat intake, and the less exercise. If drinking, smoking, and meat intake are high but there is a lack of exercise, a chronic disease can occur and cause premature death unless there is a change in the new health behavior. The results of this study suggest researches to understand the motives related to alcohol abstinence, smoking cessation, dietary control and exercise, and to develop programs.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2004년도 춘계학술발표대회 논문집
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• pp.127-130
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• 2004

In order to verify the validity of the exhibition moethod in a science museum, this study undertakes a visitor follow-up survey, and clarifies the influence an exhibition method affect visitor's behavior, and its feature. The tracking research performed the visitor follow-up survey to family company children. The characteristic of the visitor's behavior by the exhibition method; Use frequency becomes low in order of 'Experience type' 'Participation type' 'Fixed type'. Experience type has tendencies, such as repetitive and continuing use, and use time was long. Otherwise use time of Fixed type was short. As a result, although the use frequency of Hands-on is high and its use time is longer than Hands-off, it turns out that is influenced according to factors, such as the exhibition method, presentation and the contents of exhibition.