• 유통과학연구
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• 제19권2호
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• pp.15-24
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• 2021

Purpose: The research is to find out the perception of consumers for the convenience store (c - store) image in an emerging market, with a sample from Ho Chi Minh City. Research design, data, and methodology: Data were collected using a 24 - item structured questionnaire into six factors, namely: store atmospheric, merchandise, supplementary service, customer convenience, sales personnel, promotion. Five hundred consumers shopped at the different c - stores were collected for a multidimensional scaling technique that creates a perceptual map illustrating of c - store image. Results: The results point out that consumers' perception of a different c - store is different. The trend of c- stores are focusing on the dimensions of the function aspect. The customers also put their attention on the psychological dimension, which, in this case, is customer convenience with a sharp point. Almost all stores are bad on store atmospheric in customer- based. Conclusions: The modern retail store chains need to focus on elements to create a store image positioning and improve the perceptions of the consumers towards the store. Besides, customers not only visit the stores, not due to its convenient location, mass media or shopping experience, but also a strong identity for the store's brand image.

• 전기전자학회논문지
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• 제25권4호
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• pp.697-702
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• 2021

고속 푸리에 변환(Fast Fourier Transform, FFT)은 다양한 응용처에서 널리 사용되는 주요 신호처리 블록이다. 일반적으로 1024 포인트 이상의 긴 FFT 처리의 경우 높은 SQNR(Signal-to-Quantization Ratio)를 유지하면서도 낮은 하드웨어 복잡도의 구현이 매우 중요하다. 본 논문에서는 낮은 복잡도의 FFT 알고리즘과 간단한 동적스케일링 기법을 제시한다. 이를 통해 2048 포인트 FFT연산에 대해서 널리 알려진 radix-2 알고리즘에 비해 곱셉기의 수를 절반으로 줄일 수 있으며, 또한 twiddle factor를 저장하기 위해 필요한 테이블의 크기를 radix-2 및 radix-2² 알고리즘에 비해 각각 35% 및 53%로 축소할 수 있다. 그리고 내부 데이터의 폭을 점진적으로 늘리지 않고서도 55dB 이상의 높은 SQNR을 달성하는 것을 확인하였다.

• 한국지역지리학회지
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• 제21권3호
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• pp.569-582
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• 2015

본 연구는 충청지역 6개 온천관광지(유성, 온양, 도고, 수안보, 아산, 덕산)를 대상으로 이미지 유사성 및 선택요인 인식도를 다차원척도법을 활용하여 분석함에 목적이 있었다. 실증분석 결과는 다음과 같다. 첫째, 온천관광지의 이미지 유사성 분석 결과, "아산과 온양" 그리고 "수안보와 덕산"이 각각 다른 유사한 이미지 그룹을 형성하고 있다. 그러나 유성은 다른 온천관광지와 다른 이미지를 갖고 있다. 둘째, 온천관광지 선택요인 인식도 분석 결과, 선택요인 '온천시설', '이용비용 및 '서비스질'은 분석대상 6개 온천에서 인식도에서는 큰 차이가 없으나, '온천명소'는 온양, 유성, 덕산 및 수안보 온천에서 선택요인 반영도가 높으나 아산과 도고는 반영도가 낮게 나타났다. 선택요인 '관광명소'는 온양, 유성 및 도고 지역의 속성 반영도가 높으나 아산은 낮은 것으로 분석되었다.

• Ocean and Polar Research
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• 제33권2호
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• pp.99-111
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• 2011

To estimate the effects of limitation nutrients for phytoplankton growth and its influences on short-term variations of a winter phytoplankton community structure, we investigated the abiotic and biotic factors of surface and bottom waters at 20 stations of inner and offshore areas from 6 to 7 February in Gwangyang Bay, Korea. Also, several algal bio-assay studies were conducted to identify any additional nutrient effects on phytoplankton assemblage using surface water for the assay. The dominant species in the bay was diatom Skeletonema costatum, which occupied more than 70% of total species in most stations (St.1-16) of the inner bay. According to a cluster and multidimensional scaling (MDS) analysis based on phytoplankton community data from each station, the bay was divided into three groups. The first group included stations from the south-western parts of Myodo lsland, which can be characterized as a semien-closed eutrophic area with high phytoplankton abundance. The second group included most stations from the north-eastern part of Myodo lsland, influenced indirectly by surface water currents from offshore of the bay. The standing phytoplankton crops were lower than those of the first group. The other cluster was restricted to samples collected from offshore of the bay. In the bay, silicon (Si) and phosphorus (P) were not a major limiting factor for phytoplankton production. However, since the DIN: DIP and DSi: DIN ratios clearly demonstrated that there were potential stoichiometric N limitations, nitrogen (N) was considered as a limiting factor. Based on the algal bio-assay, in vivo fluorescence values in N (+) added experiments were higher compared to control and P added experiments. Our results suggested that nitrogen may act as one of the most important factors in controlling primary production during winter in Gwangyang Bay.

• 한국콘텐츠학회논문지
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• 제18권10호
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• pp.175-182
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• 2018

본 연구는 2016년 지역사회건강조사 원시자료를 이용하여 만 25~54세 연령의 104,811명의 경제활동 인구를 대상으로 구강검진수검 여부와 관련된 요인들의 영향 정도를 확인하고자 하였다. Multiple logistic regression analysis를 시행하여 구강검진 수검률에 영향을 미치는 일반적 특성, 사회경제적 지리적 특성, 구강건강관리행태 요인을 파악하였다. 연령 및 교육수준이 높을수록, 치석제거를 경험한 경우, 주관적 구강건강수준이 매우 좋은 경우, 필요치과진료 수진자에서 구강검진 수검률이 높게 나타났다. 소득분위가 높을수록 구강검진 수검률이 낮게 확인되었다. 경제활동 인구의 연령, 결혼여부, 교육수준, 지역, 소득수준, 직업, 치석제거 경험 여부, 필요치과진료 미수진 여부 등이 구강검진 수검 여부에 있어 유의한 영향이 있음이 나타났다. 구강검진에 대한 접근성 향상을 위한 효율적인 구강검진사업에 실증적 근거를 마련하고자 한다.

• 한국정보과학회논문지:시스템및이론
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• 제35권6호
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• pp.273-283
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• 2008

최근 많은 임베디드 실시간 시스템에 동적 전압 조절(Dynamic Voltage Scaling: DVS)을 지원하는 프로세서를 사용하고 있다. 이런 시스템의 설계 및 동작의 최적화를 위한 중요한 요소 중 하나가 전력(power)이다. 동적 전압 조절을 지원하는 프로세서의 슬로우다운을 이용하므로서 많은 소비 전력을 절약할 수 있다. 본 논문에서는 태스크의 동기화가 필요한 임베디드 실시간 시스템에서 효율적인 전력 소비를 위해 태스크들의 슬로우다운 값을 구하는 휴리스틱 알고리즘들을 제안한다. 기존 알고리즘에서는 상대 마감시간이 작은 태스크의 슬로우다운 값은 상대 마감시간이 크거나 같은 태스크의 슬로우다운 값보다 크거나 같아야 한다는 제약조건을 가지고 있다. 본 논문에서는 이 제약조건을 완화하여 기존 알고리즘과 같은 시간복잡도를 가지면서 전력을 더 작게 소비하는 휴리스틱 알고리즘들을 제시한다. 실험을 통해 소비전력 면에서 효율적임을 보였다.

• 대한치과기공학회지
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• 제35권4호
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• pp.395-403
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• 2013

Purpose: This article examined the affecting factors of a malocclusion status of a patient for orthodontic treatment, orthodontics medical expenses and oral health behavior on orthodontic satisfaction. Methods: This paper conducted a survey from the 15th of July to 30th of September 2012 for the patients who were under orthodontic treatment at three dental clinics where are in Deagu, and distributed a total of 210 questionnaires and analyzed 194 questionnaires, excepting for some questionnaires that were answered unfaithfully. Results: This study classified the related factors into a feeling of satisfaction with treatment and mental satisfaction for finding orthodontic satisfaction. There were the effect of the right tooth-brushing method, a periodic scaling and orthodontics medical expenses on a feeling of satisfaction with treatment, and power of explanation was 16.7%. Conclusion: There were the effect of a malocclusion status, matters that requires attention during orthodontic treatment, a periodic scaling during orthodontic treatment and orthodontics medical expenses on mental satisfaction, and power of explanation was 16.9%. Based on the result above, this paper concluded that preventive treatment and early treatment should be emphasized through developing a program for regular oral examination suited to each medical type, including the method for improving the medical treatment condition and care service for increasing orthodontic satisfaction, which the dental medical-service providers could consider the patients and secure trust.

• 한국전자파학회논문지
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• 제21권7호
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• pp.805-814
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• 2010

기존 Crank-Nicolson FDTD 기법(CN FDTD 기법)의 비등방성 분산 특성을 개선하기 위한 CN ID-FDTD 기법을 제안하였다. 제안한 CN ID-FDTD 기법은 공간 미분 연산을 위해 기존 CN FDTD 기법의 centered 유한 차분식 (Finite Difference equation: FD 연산식)이 아닌 isotropic-dispersion 유한 차분식(ID-FD 연산식)$^{[1],[2]}$을 이용한다. 본 논문에서는 손실 매질에 대한 CN ID-FDTD 기법의 분산 관계식을 유도하였고, 이 분산 관계식을 이용해 ID-FD 연산식에서 분산 오차(dispersion error)를 줄이는 가중치(weighting factor)와 보정값(scaling factor)을 제시하였다. 그리고 해석 결과의 정확성 비교를 통해 CN ID-FDTD 기법에서는 기존 CN FDTD 기법의 단점이었던 비등방성 분산 오차가 확연하게 감소하는 것을 확인하였다.

• 한국치위생학회지
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• 제18권2호
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• pp.227-237
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• 2018

Objectives: This study aims to recognize the importance of dental hygiene process diagnosis of dental hygiene process which can comprehensively grasp the patient's problem and to use it as a basis for establishing the patient's preventive treatment plan. Methods: This study did survey to 443 patients who received treatment based on the oral health care program from a dental clinic in Busan from January 2015 to January 2017. Data analysis was performed using IBM SPSS Statistics (Version 21.0), and statistical significance level was set at ${\alpha}=0.05$. Binary logistic regression analysis was performed to the dental hygiene problems affecting the dental hygiene plan. Results: There were significant differences in dental hygiene problems between male and female respondents on various dental problems such as dental plaque deposition, attrition, stain, dental fear, possibility of jaw joint disorder, food pressing, possibility of malocclusion. There were also significant differences in dental hygiene plans between male and female respondents in air-Jet, non-smoking education, and sealant. The most common dental hygiene plan was scaling, The problem of stain showed that the scaling plan was 0.20 times less. The explanatory power of the model was 43.5%, and the Hosmer and Lemeshow tests were 0.345. Conclusions: Therefore, if we continue to study the factors affecting the dental hygiene problems and the plan, we can reduce the burden of the dental hygienists applying the dental hygiene process in the dental clinic. And, it is expected that the oral health care program using the dental hygiene process will spread to the dental clinic as an excellent oral preventive program.

• 한국치위생학회지
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• 제9권1호
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• pp.125-139
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• 2009

Objective : This study was performed in order to provide basic data for halitosis prevention and establish a device to efficiently eliminate halitosis and to analyze the factors that affect the halitosis. Methods : Oral examination on the Gingival index, CPITN, Tongue Plaque index, and OHI-S as well as halitosis measurement among 293 rural residents. Results : Gingival index was high at mild on female and at moderate on male(p=0.025). Sorting the result by age, mild was 54.1% in the 40s, and moderate was 49.5%, 42.0% and 70.0% each in the 50s, 60s, and the 70s(p=0.005). The need for dental plaque management was 100%. The need for scaling was high with 78.3%, 93.0%, 89.9%, and 90.0% each for the 40s, 50s, 60s, and 70s. The need for complex periodontal treatment was also high with 32.4%, 47.5%, 48.7% and 60.0%, each for the 40s, 50s, 60s, and 70s(p=0.050). The highest bad condition for OHI-S was 69.5%, and good being 18.9%, and very bad being 11.6%. For moderate tongue plaque index was 74.4% as the highest. As the level of education increased, the slight tongue plague was increased, but in contrast, the moderate and higher tongue plague index was decreased(p=0.010). OG under 50ppm was 61.1% on male and OG over 50ppm was 50.9% on female(p=0.041). In OG over 50ppm, CPITN was 52.1% and 41.9% in scaling and complex periodontal treatment group(p=0.018). OHI-S, in bad and very bad condition with OG, over 50ppm, was 48.7% and 46.9%(p=0.019). The higher tongue plague index showed significant amount of increase at OG and EG above 50ppm(p=0.006). $NH_3$, as the tongue plaque index increased, the wider range of distribution was shown(p=0.000). As for the multiple regression analysis result, there have been selected females and tongue plaque index as factors affecting OG. There have been selected age and tongue plaque index as factors affecting EG and there have been selected females as factors affecting on $NH_3$. Conclusions : With the aforementioned results in mind, the status of halitosis among rural residents is considered to bare a close relation with oral environments. we have to focus on correct tooth brushing methods and tongue brushing, with using tongue cleaner to remove fur of tongue plaque. Also, in order to analyze exactly the factors of individual halitosis, we need continuous and systematic study.