• The Korean Journal of Pain
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• v.7 no.2
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• pp.211-216
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• 1994

Celiac plexus block is performed to relieve intractable upper abdominal cancer pain. Generally, celiac plexus blocks have been performed under control of X-ray fluoroscopy to determine the position of the needle tip and the spread of contrast media. During the period from March 1992 to February 1994, we have performed 21 cases of neurolytic celiac plexus block to alleviate pain of intra-abdominal malignancy. We retrospectively evaluated the location of the needle tip and the spread of contrast media. P-A views of simple abdomen demonstrated the locations of the needle tip: 66.7% of the left needle tips were in upper 3/1 of L1 (6 cases) and $T_{12}-L_1$ interspace (8 cases), 50% of the right needle tips were in upper 1/3 of $L_1$, (6 cases) and $T_{12}-L_1$ interspace (4 cases). Contrast media from the right needle spread upward to middle 1/3 of $T_{10}$ (5 cases) and middle 1/3 of $T_{11}$ (5 cases), downward to middle 1/3 of $L_1$ (6 cases) and lower 1/3 of $L_1$ (3 cases). Contrast media from the left needle were spread upward to middle 1/3 of $T_{10}$ (5 cases) and evenly to other spaces, downward to middle 1/3 of $L_1$, (4 cases) and $L_1-L_2$ interspace (6 cases). We analyze the spread of contrast media according to distance from needle tip by authors score system. Contrast media of right needle spread upward 6.1 and downward 3.4, that of left needle spread upward 6.5 and downward 3.7.

• Asia Marketing Journal
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• v.20 no.2
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• pp.41-63
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• 2018

Incidental envy influences behavior in various domains. However, no research, to date, has investigated whether incidental envy influences interpersonal behavior toward others who are unrelated to the emergence of the emotion. That is, the literature is silent on how those who experience incidental envy engage in interpersonal contact and how this may affect consumers. In this paper, we address this question by investigating the influence of incidental envy on interpersonal contact with others of higher or lower status based on the social comparison theory. We demonstrate that incidental envy (versus a neutral emotion) motivates people to contact higher status others to facilitate upward assimilation (experiments 1 and 2). We also show that when competition (a situational factor that heightens the personal relevance of the interaction with the target) is involved, individuals who feel envy (versus a neutral emotion) are more likely to contact lower status others to engage in downward contrast (experiment 3). We conclude with a discussion of the practical implications of our findings.

• Asia Marketing Journal
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• v.15 no.2
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• pp.99-116
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• 2013

This study examines whether product promotions are influenced by the market standing of promoted products, using social comparison theory (upward versus downward comparisons). It is hypothesized that people in possession of a product that is inferior to the one on promotion express less discomfort about the promotion and use the information more than do people in possession of a superior product. People in possession of an inferior product may also exhibit more positive attitudes toward the product on promotion, but may show poorer attitudes toward their own possessed product than do people with a superior product. This is because people in an inferior socioeconomic position show a strong motivation to improve themselves through upward social comparison, whereas people in a superior socioeconomic position maintain a strong sense of superiority in downward social comparison, which suggests strong endowment effects. The findings mainly support the hypotheses, and suggest that sales promotions are more effective for people who currently own an inferior product, but not for people with a superior product, who have a strong motivation to maintain their sense of superiority. The findings also imply that, in order to attract consumers in the superior market, managers for inferior products need to turn to methods other than sales promotions, which may include introducing a new brand or sub-brand, or emphasizing luxury and modern features. In contrast, managers for superior products may emphasize product functions and attributes of superior products in their promotions, as people with inferior products may consider such information as benefits of the superior products.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2013.11a
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• pp.4-7
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• 2013

In recent downtown high land due to an increase in the utilization of land from the property line to maximize the proximity of the construction and use of underground structures has increased. The nature of urban underground retaining structure construction safety, environmental management, and civil contrast situations, construction periodt perspective, this method is widely used in the backhand. Recent Patents DP method and the method of the DBS method than in the SPS process is deleted according to the PRD process cost savings are generated. The workability and safety study of two kinds of method, such as air speed, and considering the reduction of indirect costs in terms of economic efficiency is considered to be a superior method.

• Journal of Drive and Control
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• v.21 no.4
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• pp.208-213
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• 2024

The use of drone sprayers in South Korea is on the rise. The pesticides released by these drone sprayers are directed onto crops through the downward airflow created by the drone's rotors, making this airflow a key factor in the effectiveness of the spraying process. The required thrust varies depending on the amount of pesticide carried by the drone, which subsequently affects the intensity of the downward airflow. This study conducted experiments to examine how variations in the intensity of this airflow impact the adhesion of spray particles. Initially, to evaluate differences between nozzle types, two types of nozzles-Air Induction (AI) and XR-were tested to measure the adhesion of spray particles at different load levels. With the AI nozzle, the deposition of spray droplets increased by 25.9% as the load increased by 14.3%. In contrast, the XR nozzle showed a decrease in droplet deposition. Additional experiments using the XR nozzle, divided into three load stages, revealed a similar trend. This behavior is likely due to the increased downward airflow allowing more spray particles to reach the target area, while simultaneously reducing their adhesion because of the intensified downward force. Further research is needed to identify optimal operational strategies that maximize droplet deposition by effectively balancing drift and adhesion.

• The Korean Journal of Applied Statistics
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• v.34 no.2
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• pp.177-190
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• 2021

Random forests is a popular method that improves the instability and accuracy of decision trees by ensembles. In contrast to increasing the accuracy, the ease of interpretation is sacrificed; hence, to compensate for this, variable importance is provided. The variable importance indicates which variable plays a role more importantly in constructing the random forests. However, when a predictor is correlated with other predictors, the variable importance of the existing importance algorithm may be distorted. The downward bias of correlated predictors may reduce the importance of truly important predictors. We propose a new algorithm remedying the downward bias of correlated predictors. The performance of the proposed algorithm is demonstrated by the simulated data and illustrated by the real data.

• The Journal of the Korea Contents Association
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• v.16 no.12
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• pp.574-590
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• 2016

This research aims to examine the effects of various types of social comparison in SNS on users' life satisfaction. For this, this research posited four types of social comparison including upward contrast, upward identification, downward contrast and downward identification that might affect SNS users' life satisfaction. Several other factors including demographic variables, SNS usage time, offline social capital and social comparison orientation as control variables were taken into account and the moderating effects of social comparison orientation in the relationships between four types of social comparison and users' life satisfaction was also examined. An online survey was employed for collecting data and the date collected were analyzed with hierarchical regression analysis. The results showed that ages and marriage status have influences on SNS users' life satisfaction. It was proven that the degrees to which SNS users participate in family activities and club/group activities in which they are interested have correlations with their life satisfaction. The findings also revealed that only upward contrast and upward identification among four types of social comparison have influences on the life satisfaction and there is the moderating effect of social comparison orientation on the relationship between upward identification and life satisfaction. On the basis of the results, the necessity of new perspectives in understanding social comparison experience in SNS as compared to the existing literature were discussed.

• Korean Journal of Culture and Social Issue
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• v.8 no.2
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• pp.171-190
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• 2002

Counterfactual thinking refers to a mental simulation of "What might have been," a cognitive process of once-possible-but-unrealized alternatives to facts, Counterfactuals have been reported to produce intensive emotional experiences, specifically regret. The present research reviewed and tried to integrate the previous inconsistent findings in the view of functional value of counterfactuals. Social psychologists proposed that counterfactuals could be categorized into upward(thoughts of better alternatives) versus downward(thoughts of worse alternatives) and additive versus subtractive. Counterfactual processes are more likely to occur following negative or unexpected rather than positive expected outcome, consistent with the minimization-mobilization hypothesis. Downward counterfactuals serve affective functions(to make one feel better) through contrast effects. Upward counterfactuals serve preparative functions(to prepare and improve performance in the future similar tasks) through causal inferences. Also, upward counterfactuals have been demonstrated in several studies to be followed by success-related attitudes and intentions and actual performance improvement. Furthermore, in terms of regulatory focus, downward counterfactuals were related with the prevention focus(to maintain the current status and upward counterfactuals were related with the promotion focus(to improve the current status). Those findings from numerous studies support that counterfactuals are functional to serve human ongoing motives. In conclusion, applicability and limitation of functional value of counterfactual thinking were discussed.

• Science of Emotion and Sensibility
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• v.16 no.2
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• pp.195-206
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• 2013

The main causes of traffic accidents while driving a car is of the driver's visual distraction. In this study, the color sensitivity of the information projected on the windshield were evaluated for HUD (Head Up Display) system which helps the driver's eyes on the road while driving. The driving Information were projected $9^{\circ}$ downward from front sight $0^{\circ}$ under lab's fluorescent lights, LED floorlights and the TV had having 25 [lux] illumination when driving at night environment and 100,000 [lux] of daylight environment. Munsell color hue of the basic five colors (R, Y, G, B, P) and the color of traffic lights YR, W were the color of the seven characters, each character were outlined by White, Gray except for W. Total of 19 experimental stimuli was shown in the environment of day and night driving for asking visibility information of color, fatigue, preferences, and evaluate the degree of interference. The results came out that the bright Y and G color is visibility significantly for daylight. Second, with the outline of the text, the color of the outline works as a background for luminance contrast effects and affects visibility. Third, without the outline, the glass in front of the vehicle acts as the background and the luminance contrast of characters achieve greater brightness and visibility. The luminance contrast between the stimuli and background should be considered for increasing color visibility for driving information which is an important factor for HUD commercialization.

• Geomechanics and Engineering
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• v.22 no.2
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• pp.153-163
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• 2020

Laboratory experiments were conducted with two different soil conditions to investigate rainfall infiltration characteristics. The soil layer materials that were tested were weathered granite soil and weathered gneiss soil. Artificial rainfall of 80 mm/hr was reproduced through the use of a rainfall device, and the volumetric water content and matric suction were measured. In the case of the granite soil, the saturation velocity and the moving direction of the wetting front were fast and upward, respectively, whereas in the case of the weathered gneiss soil, the velocity and direction were slow and downward, respectively. Rainfall penetrated and saturated from the bottom to the top as the hydraulic conductivity of the granite soil was higher than the infiltration capacity of the artificial rainfall. In contrast, as the hydraulic conductivity of the gneiss soil was lower than the infiltration capacity of the rainfall, ponding occurred on the surface: part of the rainfall first infiltrated, with the remaining rainfall subsequently flowing out. The unsaturated hydraulic conductivity function of weathered soils was determined and analyzed with matric suction and the effective degree of saturation.