To increase the utilization of the intelligent methodology of smart farm management, estimation modeling techniques are required to assess prior examination of crops and environment changes in realtime. A mandatory environmental factor such as CO2 is challenging to establish a reliable estimation model in time domain accounted for indoor agricultural facilities where various correlated variables are highly coupled. Thus, this study was conducted to develop an artificial neural network for reducing time complexity by using environmental information distributed in adjacent areas from a time perspective as input and output variables as CO2. The environmental factors in the smart farm were continuously measured using measuring devices that integrated sensors through experiments. Modeling 1 predicted by the mean data of the experiment period and modeling 2 predicted by the day-to-day data were constructed to predict the correlation of CO2. Modeling 2 predicted by the previous day's data learning performed better than Modeling 1 predicted by the 60-day average value. Until 30 days, most of them showed a coefficient of determination between 0.70 and 0.88, and Model 2 was about 0.05 higher. However, after 30 days, the modeling coefficients of both models showed low values below 0.50. According to the modeling approach, comparing and analyzing the values of the determinants showed that data from adjacent time zones were relatively high performance at points requiring prediction rather than a fixed neural network model.

본 연구의 목적은 최근 심리구성주의 정서이론에서 제안한 얼굴정서 지각 과정에 미치는 언어의 영향을 정신물리학적 방법을 사용하여 검증하는 것이다. 본 연구에서는 감정단어가 얼굴표정 전에 제시될 경우, 얼굴표정의 정서 범주에 대한 판단 기준을 그 감정단어가 표상하는 정서 개념 맥락에 가깝게 이동시킬 것이라는 가설을 세웠다. 실험에서는 분노 또는 기쁨을 표현하는 감정단어가 표적 얼굴 전에 잠시 제시되었고, 표적 얼굴로는 중립에서 분노 (실험 1), 중립에서 행복 (실험 2)으로 점진적으로 변화하는 얼굴표정 중 하나가 무선적으로 제시되었다. 실험참가자는 표적 얼굴의 정서를 분노 혹은 중립 (실험 1), 행복 혹은 중립 (실험 2)으로 판단하는 2안 강제선택 과제를 수행하였다. 본 연구의 목적은 최근 심리구성주의 정서이론에서 제안한 얼굴정서 지각 과정에 미치는 언어의 영향을 정신물리학적 방법을 사용하여 검증하는 것이다. 본 연구에서는 감정단어가 얼굴표정 전에 제시될 경우, 얼굴표정의 정서 범주에 대한 판단 기준을 그 감정단어가 표상하는 정서 개념 맥락에 가깝게 이동시킬 것이라는 가설을 세웠다. 실험에서는 분노 또는 기쁨을 표현하는 감정단어가 표적 얼굴 전에 잠시 제시되었고, 표적 얼굴로는 중립에서 분노 (실험 1), 중립에서 행복 (실험 2)으로 점진적으로 변화하는 얼굴표정 중 하나가 무선적으로 제시되었다. 실험참가자는 표적 얼굴의 정서를 분노 혹은 중립 (실험 1), 행복 혹은 중립 (실험 2)으로 판단하는 2안 강제선택 과제를 수행하였다.

Dimensional stability of polymer electrolyte membrane stands out always important issue as well as proton conductivity. The reinforced membrane can be a good solution to enhance the dimensional stability for not only perfluorosulfonic acid polymer but also hydrocarbon based polymer. In this study, we have prepared nanofiber reinforced polymer electrolyte membranes for proton exchange membrane fuel cells. The nanofiber reinforced PEMs was impregnated by introducing hydrocarbon polymer electrolytes into web-like substrate. Due to high porosity and the intrinsic structure of reinforced PEMs, dimensional stability are improved without sacrificing membrane performance. Consequently, reinforced PEMs exhibited higher physical properties than unreinforced PEMs.

As its use widens across many different industries such as airlines, retailing, banking, and hotels, the effective management of customer loyalty programs is becoming an important issue. Previous studies have shown that loyalty programs have a positive impact on customer retention, customer share, market share, and sales (Bolton et al., 2000; Mägi, 2003; Verhoef, 2003; Lacey et al., 2007). A loyalty program is defined as any institutionalized incentive system that attempts to enhance consumers’ consumption behavior over time beyond the direct effects of changes to the price or the core offering (De Wulf et al., 2001; Palmatier et al., 2006; Henderson et al., 2011). The fundamental goal of loyalty programs of firms is to have a long-term relationship with their customers and to increase their customer lifetime value (Reichheld, 1993; Sharp and Sharp, 1997). Most earlier studies that showed positive effects of loyalty programs have been mainly concerned about the changes in customer response resulting from being inducted into the VIP program (Bolton et al., 2000; Mägi, 2003; Verhoef, 2003; Lacey et al., 2007). On the other hand, most loyalty programs are hierarchical, which sets several customer classes and provides preferential benefits to customers based on their status. And customers who are placed at higher VIP level are required to spend larger amounts to maintain that status level. Under these types of loyalty programs, many recent studies have focused on how customers perceive and respond to their status and the accompanying preferential treatments (Mathies and Gudergan, 2012; Mayser and Wangenheim, 2013; Xia and Kukar-Kinney, 2014; Pez et al., 2015). Companies adjust each customer’s VIP status level on a regular(yearly) basis based on his or her actual spending level during the previous period. A customer can be demoted to a lower level if he or she fails to spend the required amount while a customer can be elevated to a higher level if the spending exceeded the required level. Although this is a common practice in the industry, only a few studies to date have looked at customer responses to changes in their status level (Wagner et al., 2009; Berlo et al., 2014; Eggert et al., 2015; Hwang and Kwon, 2015). While most of these studies have relied on measuring attitudes under experimental conditions, the motivation of this research is to examine customers’ actual behavioral response to a status adjustment using real-life data. We particularly focus on the effects of status demotion and how the response is moderated by situational or psychological factors. Specifically, the research questions are presented as follows: 1)If customers are demoted as a result of not fulfilling the firm’s required spending level, how does their purchase behavior change? 2) How does the shortfall amount (the difference between the spending required to maintain the status and the actual spending) impact the demotion effect? 3) What moderators strengthen or weaken the relationship? Using actual VIP customer data from one of the major department stores in Korea, this paper applies the event study methodology to investigate changes in customer purchase behavior resulting from a demotion. Shortfall amount, which can be defined as the degree to which a demoted customer does not meet the firm’s required spending level, is the key variable in analyzing the different purchase response of demoted customers. Propensity for conspicuous consumption and store familiarity of the customers are also proposed as moderators that interact with the shortfall amount. People who experience status demotion in organizations have been found to respond negatively toward the organization by reducing their loyalty, trust, or commitment and increasing switching intentions to other organizations (Pfeffer, 1981; Trice and Beyer, 1984; Wagner et al., 2009; Berlo et al., 2014; Hwang and Kwon, 2015). Status demotion of VIP customers is also expected to negatively influence their purchase behavior. Equity theory (Adams, 1963) provides the conceptual foundation for hypothesizing about the role of shortfall amount in moderating the negative effect of status demotion on customers’ purchase amount. According to equity theory, people in social exchange relationships perceive the fairness of transactions by comparing their inputs (costs) into the exchange to outputs (benefits) from the exchange. People also perceive the fairness by evaluating whether their input/output ratio is consistent with that of their referent groups. Adams (1963) argues that people are motivated to restore equity when they perceive unfairness in a social exchange relationship by increasing or decreasing inputs based on their input/output ratio relative to that of their referents. In our context, the equity theory implies that demoted customers whose shortfall amount is smaller are more likely to perceive the status change to be more unfair than those whose shortfall amount is larger. These customers may feel that the decrease in preferential treatment they receive due to demotion is unfairly large given the small difference in spending between themselves and those who were able to maintain their status level. They may also feel that their spending (i.e., contribution to the company) is much greater than other customers in the lower demoted status level. To the extent that these customers are likely to feel that the exchange relationship with the firm is unjust, they will respond negatively toward the firm (Campbell, 1999; Xia and Kukar-Kinney, 2014) and it is predicted that they will show a larger decrease in their post demotion spending compared to their counterparts whose shortfall amount is larger. That is, the smaller (greater) the demoted customers’ shortfall, the stronger (weaker) the negative relationship between customer demotion and purchase amount. In this research, consumers’ propensity for conspicuous consumption and store familiarity are presented as variables that moderate the effect of shortfall amount on post demotion spending. Desire for status motivates conspicuous consumption and often leads to purchases of luxurious or altruistic goods (Han et al., 2010). Rucker and Galinsky (2008) argued that consumers are more willing to spend for status-related goods when they feel that they have low power. Based on the literature, it is anticipated that the effect of shortfall will be diluted if a demoted customer has strong propensity for conspicuous consumption as he or she may increase purchases to overcome threats caused by status reduction. In other words, when customers are demoted, the effect of shortfall on purchase amount is weakened as propensity for conspicuous consumption becomes higher. Familiarity is defined as the number of product-related experiences that have been accumulated by a consumer (Alba and Hutchinson, 1987). As the familiarity with a product increases, consumers generally reduce cognitive effort in choosing the product and are more likely to select it habitually or in inertia (Rhee, 2003). Assael (1998) proposed that a process of consumers’ product choice is similar with that of consumers’ store selection. Thus, based on previous studies, it is predicted that the effect of shortfall on post demotion purchase amount is diluted if a demoted customer’s store familiarity is higher because he or she may be less likely to decrease purchases since they face a higher cost of switching to other stores. In other words, when customers are demoted, the effect of shortfall on purchase amount is weakened as store familiarity becomes higher. This research applies the event study method to study the impact of shortfall amount on post demotion change in purchase amount. Specifically, we capture the increase or decrease in post demotion purchase through notion of cumulative abnormal purchase amount. Cumulative abnormal purchase amount is obtained for each demoted customer by calculating the difference between the actual purchase amount after the status change with the expected purchase amount (i.e., baseline) if the customer had not experienced the status demotion. If the actual purchase amount is smaller than the baseline, then the cumulative abnormal purchase amount is negative, which indicates that the customer responded negatively to the demotion. The results revealed that the average cumulative abnormal purchase amount of demoted customers was negative. Also, the shortfall amount had a positive impact on the cumulative abnormal purchase amount, supporting the hypothesis that demoted customers whose shortfall was small were more likely to show a larger decrease in post demotion purchase(i.e., larger negative cumulative abnormal purchase amount). Both of the moderating variables--propensity for conspicuous consumption and store familiarity of demoted customers--weakened the effect of shortfall on the cumulative abnormal purchase amount. This paper contributes to the literature by extending the understanding of consumer behavior in the context of hierarchical loyalty programs and status reduction in a real-world setting. Specifically, this study uses the notion of perceived fairness adopted from equity theory to hypothesize about the moderating role of shortfall amount on the effect of status demotion. This paper also provides several managerial implications to help marketing managers manage their loyalty program more effectively. First, it is important for the managers to recognize possible negative aspects of hierarchical loyalty programs where certain customers are inevitably demoted to lower status levels. Second, since demoted customers who ‘just miss’ the cutoff by only a small amount may perceive injustice, managers may need to look for a method to reduce such customers’ negative response. Third, companies could also seek for ways to weaken the negative effect of customer demotion through the development of marketing plans based on customer characteristics such as propensity for conspicuous consumption and store familiarity.

운전자의 신경증 수준에 따른 상황인식과 안구운동 및 운전수행에서의 차이를 비교하였다. 정적인 운전장면을 실험자극으로 사용한 실험 1에서는 신경증 수준에 따른 상황인식에서의 차이는 유의하지 않았던 반면, 안구운동의 경우 신경증 저집단에 비해 고집단이 실험자극의 주변영역에 대해 안구고정 시간비율과 안구고정 빈도비율이 모두 낮았다. 실험 2에서는 운전 시뮬레이터를 이용하여 실험참가자들이 실제 상황에 가깝게 운전하도록 한 후, 신경증 수준에 따른 상황인식, 안구운동, 그리고 운전수행 측정치에서의 차이를 비교하였다. 그 결과, 실험 1의 결과와는 대조적으로 신경증 고집단은 저집단에 비해 상황인식 점수가 상대적으로 낮았던 반면, 실험 1의 결과와 마찬가지로 신경증 실험자극의 주변영역에 대한 안구고정 시간비율과 안구고정 빈도비율이 상대적으로 낮았다. 특히, 운전수행 측정치에 대한 비교 결과, 신경증 고집단이 저집단에 비해 차선중앙 이탈값이 더 컸고 평균 운전속도도 더 느렸다.

Inter-breed and individual variations in thoracic conformation often resulted in incorrect diagnosis during interpretation of canine thoracic radiographs. Therefore, it may be helpful to build a collection of normal thoracic radiographs of different breeds for useful reference. The aim of this study is to establish a normal canine thoracic radiograph database according to breed, age, and body weight. Medical records and thoracic radiographs of Veterinary Medical Center, Chungbuk National University were reviewed retrospectively. Normal thoracic radiographs of 170 dogs out of 640 patients who had thoracic radiographs were obtained. In 170 normal dogs, Maltese, Shih-tzu, Yorkshire Terriers, and Miniature Poodle were the most prevalent breeds, with 90 dogs. In this study, the normal canine thoracic radiograph database was established in the four breeds; it can be used as normal references for interpretation of canine thoracic radiographs.

흉부 디지털 단층영상합성장치는 기존 DR의 낮은 깊이 해상도, CT의 높은 피폭선량 문제를 해결할 수 있는 획기적인 영상장치로 대두되고 있다. 그러나 제한된 스캔 각도로 인해 프로젝션이 X 선 소스 동작 방 향으로 흉부를 완전히 포함 할 수 없어 재구성 된 슬라이스의 위, 아래 방향 경계를 따라 강도의 불연속성 이 발생하게 되는데 이러한 현상을 잘림 아티팩트 (Truncation artifact)라고 한다. 이 연구의 목적은 가중 정규화 접근법을 사용하여 잘림 아티팩트를 줄이고 리스템에서 개발한 프로토 타입 흉부 디지털 단층영상합 성장치 시스템에 대한 이 접근법의 성능을 평가하는 것이다. 이 시스템의 source-to-image distance는 1100 m m 이고 X 선원의 회전 중심은 검출기 표면에서 100mm 위로 설정되었다. LUNGMAN 팬텀을 사용하여 ± 20 °의 투영 뷰를 1 ° 간격으로 41장을 얻은 후, filtered back projection 알고리즘으로 재구성했다. 정량적 평가를 위하여 시뮬레이션을 이용하여 기준영상을 재구성 후 peak signal to noise ratio와 structure similarity ind ex 값을 평가하였으며 실제 실험 데이터를 이용하여 mean value of specific direction 값을 평가하였다. 시뮬 레이션 결과로 아티팩트 보정 전 일반적인 filtered back projection 알고리즘으로 재구성 한 영상과 비교하여 peak signal to noise ratio값과 structure similarity index값 모두 각각 증가하였으며, 실제 실험 재구성 영상의 mean value of specific direction 결과는 아티팩트의 영향이 감소됨을 확인할 수 있었다. 결론적으로, 가중 정규화 방법은 잘림 아티팩트를 줄임으로써 진단의 어려움을 발생시키는 가능성을 개선시킬 수 있는 방법으로 사료된다.

0.32 T 자기공명영상시스템에서 선주사영상기법(line scan imaging)을 이용한 확산강조영상(diffusion weighted imaging; DWI) 펄스열(pulse sequence)을 개발하였다. 선주사영상은 단면선택 경사자장과 함께 90 도 펄스를 가하여 단면을 선택한 후 y 방향으로 경사자장을 가한 후 180도 라디오파 펄스를 가하여 단면영상 의 y-방향 픽셀크기와 같은 너비의 x축에 평행한 띠를 따라 에코가 발생하게 한 뒤 x-방향으로 주파수부호화 해서 1차원 k-공간 데이터를 획득하며 이를 1차원 푸리에변환하여 영상을 재구성하였다. 또한 선주사확산강 조영상(line scan diffusion weighted image)을 위해서 한 쌍의 사다리꼴모양의 경사자장을 선주사영상기법의 180도 펄스 전후에 대칭으로 배치하였으며 사용된 확산경사자장기울기의 최대값은 G = 15 mT/m 이었고 최 대 b 값은 301.50 s/mm2이었다. 본 연구에서 개발된 선주사확산강조펄스열을 이용하여 0.32 T 자기공명영상 장비에서 트리아실글리세롤 팬텀(triacylglycerol, TAG) 및 염화나트륨 수용액 (NaCl = 0.1w/v%) 팬텀 영상 을 획득하였다. 또한 1.5 T 자기공명영상시스템에서 단일여기에코평면영상화(single shot echo planar imaging)로 동일한 팬텀의 확산강조영상을 구하였다. 선주사확산강조영상은 가장 널리 이용되고 있는 에코평 면영상을 이용한 확산강조영상과 비교하여 자화율차이에 의한 영상왜곡이나 화학이동에 의한 허상들이 없음을 확인하였다. 특히 선주사확산강조영상에서 측정한 염화나트륨 수용액 팬텀의 확산계수(963.90 ± 79.83 × 10-6 mm2 /s)는 1.5 T에서 계산된 확산계수(956.77 ± 4.12 × 10-6 mm2 /s)와 오차범위 내에서 일치하였다.