• Asian Pacific Journal of Cancer Prevention
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• v.15 no.13
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• pp.5359-5364
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• 2014

Background: To determine surgical outcomes, perioperative complications, and patient outcomes in gynecologic cancer patients undergoing robotic surgery. Materials and Methods: Surgical outcomes, including docking time, total operative time, console time, estimated blood loss (EBL), conversion rate and perioperative complications were retrospectively reviewed in 30 gynecologic cancer patients undergoing robotic surgery. Patient outcomes included recovery time and patient satisfaction, as scored by a visual analogue scale (VAS) from 0-10. Results: The operations included 24 hysterectomies with pelvic lymphadenectomy (PLD) and/or para-aortic lymphadenectomy, four radical hysterectomies with PLD, and two radical trachelectomies with PLD. Mean docking time was $12.8{\pm}9.7min$, total operative time was $345.5{\pm}85.0min$, and console time was $281.9{\pm}78.6min$. These times were decreased in the second half of the cases. There was no conversion rate. Three intraoperative complications, including one external iliac artery injury, one bladder injury, and one massive bleeding requiring blood transfusion were reported. Postoperative complications occurred in eight patients, most were minor. Only one patient had port herniation that required reoperation. Mean hospital stay was $3.5{\pm}1.7days$, and recovery time was $14.2{\pm}8.1days$. Two-thirds of patients felt very satisfied and one-third felt satisfied; the mean satisfaction score was 9.4 +0.9. Two patients with stage III endometrial cancer developed isolated port site metastasis at five and 13 months postoperatively. Conclusions: Robotic surgery for gynecologic cancer appears to be feasible, with acceptable perioperative complication rate, fast recovery time and high patient satisfaction.

• International Journal of Advanced Culture Technology
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• v.7 no.4
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• pp.96-103
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• 2019

In this paper, we propose two-stage multichannel architecture for oyster product management system, called cloud stage and agent stage. There are two communication channels at each stage. In cloud stage, the embedded system in the smart scale communicates with the server through two channels, Ethernet or 3G/LTE mobile communication. In agent stage, PCs and smart phones called agents communicate with the server also through Internet and 3G/LTE mobile communication. Compared with previous system in which the amount of the oyster produced in oyster workplaces could be monitored only at the console of only one oyster main server, developed system makes it possible to monitor the amount of produced oyster at several PCs (or smart phones). In addition to the amount of oysters produced at all oyster workplaces the environment of oyster workplaces such as temperature and humidity can be monitored on agents to judge the freshness. Two-stage architecture with multiple channels makes it possible to monitor the amount of oyster product and environment of the oyster workplace at any place in real time.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.31B no.7
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• pp.149-158
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• 1994

Recently the fuzzy control is widely used as a tool for constructing automatic control systems which can replace the manual operation of large-scale nonlinear plants. In most applications of the fuzzy control however it is hard to meet the requirement of the operation time. In some real-time control the fuzzy control scheme requires too much computing time for fuzzification inference and defuzzification. To reduce the computing time there may be two alternatives the development of a new operation algorithm and the design of high-speed fuzzy hardware. In this paper to solve the problem of reducing the fuzzy operation time we propose a new high-speed fuzzy hardware scheme which has merits of its generality and extensibility. Finally we verify the proposed fuzzy hardware.

• The Bulletin of The Korean Astronomical Society
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• v.42 no.1
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• pp.55.2-55.2
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• 2017

We study the effect of driving scheme on the density-magnetic field correlation. We numerically investigate how the correlation time of driving affects the correlation between density and magnetic field. We performed MHD turbulence simulation using two different driving schemes - a finite-correlated driving and a delta-correlated driving. In the former, the forcing vectors change continuously with a correlation time comparable to the large-eddy turnover time. In the latter, the direction and amplitude of driving changes in a very short time scale.

• Journal of Korean Institute of Industrial Engineers
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• v.22 no.1
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• pp.51-63
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• 1996

In this paper, we develop two replacement-type reliability acceptance sampling plans(RASPs) for the gamma lifetime distribution assuming that the shape parameter is known. The two plans are respectively based upon failure-free period and hybrid life tests. We then compare the plans in terms of expected test time to reach a decision, power, etc. Computational results indicate among others that the failure-free period RASP has a shorter expected completion time than the corresponding hybrid RASP when the true scale parameter is 'large'. Finally, sensitivity analyses reveal that the effects of the uncertainties involved in the assumed shape parameter on the producer and the consumer risks are in favorable directions for both parties for both types of plans.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2004.03a
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• pp.205-210
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• 2004

The pulse detonation engine (PDE) has recently expected as a new aerospace propulsion system. The PDE system has high thermal efficiency because of its constant-volume combustion and its simple tube structure. We measured thrust of single-tube pulse detonation rocket (PDR) by two methods using the PDR-Engineering Model (full scale model) for ground testing. The first involved measuring the displacement of the PDR-EM by laser displacement meter, and the second involved measuring the time-averaged thrust by combining a load cell and a spring-damper system. From these two measurements, we obtained 130.1 N of time-averaged thrust, which corresponds to 321.2 sec of effective specific impulse (ISP). As well, we measured the heat flux in the wall of PDE tubes. The heat flux was approximately 400 ㎾/$m^2$. We constructed the PDR-Flight Mode] (PDR-FM). In the vertical flight test in a laboratory, the PDR-FM was flying and keeping its altitude almost constant during 0.3 sec.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.50 no.1
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• pp.28-37
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• 2001

This paper presents an efficient algorithm for the loss minimization of distribution system by automatic sectionalizing switch operation in large scale distribution systems. Simulated annealing is particularly well suited for large combinational optimization problem, but the use of this algorithm is also responsible for an excessive computation time requirement. Tabu search attempts to determine a better solution in the manner of a greatest-descent algorithm, but it can not give any guarantee for the convergence property. The hybrid algorithm of two methods with two tabu lists and the proposed perturbation mechanism is applied to improve the computation time and convergence property Numerical examples demonstrate the validity and effectiveness of the proposed methodology using a KEPCO's distribution system.

• The Journal of Internal Korean Medicine
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• v.40 no.5
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• pp.948-956
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• 2019

Objectives: The purpose of this study was to describe the effectiveness of Jeoreongchajeonja-tang as a treatment for patients with diarrhea-predominant irritable bowel syndrome (IBS-D). Methods: Two irritable bowel syndrome patients who had visited Semyung University Korean Medical Hospital were enrolled. The patients were diagnosed according to the Rome III criteria, and the treatment effect was assessed using the Gastrointestinal Symptom Rating Scale (GSRS) and the colon transit time. Results: After treatment with Jeoreongchajeonja-tang for 4 weeks, the GSRS score was improved and colon transit time was delayed. Conclusions: This study suggests that Jeoreongchajeonja-tang is effective for improving diarrhea-predominant irritable bowel syndrome. More extensive study is needed in the future.

• Nuclear Engineering and Technology
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• v.50 no.1
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• pp.54-67
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• 2018

There have been recent efforts to establish methods for high-fidelity and multi-physics simulation with coupled thermal-hydraulic (T/H) and neutronics codes for the entire core of a light water reactor under accident conditions. Considering the computing power necessary for a pin-by-pin analysis of the entire core, subchannel-scale T/H analysis is considered appropriate to achieve acceptable accuracy in an optimal computational time. In the present study, the applicability of in-house code CUPID of the Korea Atomic Energy Research Institute was extended to the subchannel-scale T/H analysis. CUPID is a component-scale T/H analysis code, which uses three-dimensional two-fluid models with various closure models and incorporates a highly parallelized numerical solver. In this study, key models required for a subchannel-scale T/H analysis were implemented in CUPID. Afterward, the code was validated against four subchannel experiments under unheated and heated single-phase incompressible flow conditions. Thereafter, a subchannel-scale T/H analysis of the entire core for an Advanced Power Reactor 1400 reactor core was carried out. For the high-fidelity simulation, detailed geometrical features and individual rod power distributions were considered in this demonstration. In this study, CUPID shows its capability of reproducing key phenomena in a subchannel and dealing with the subchannel-scale whole core T/H analysis.

• The Journal of Korean Academic Society of Nursing Education
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• v.29 no.1
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• pp.5-16
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• 2023

Purpose: This methodological study developed a scale that reflects the social support characteristics of nursing students who have experienced clinical practice and verified their reliability and validity. Methods: The 37 initial items of the scale were derived based on the results of a previous study that analyzed the concept of nursing students' social support. The initial items were revised through content validity verification, and 29 preliminary items were finally selected. Data were collected from 220 students enrolled in a nursing department in Jeollabuk-do, who had clinical practice experience, and 205 surveys were used for the final analysis. The data collection period was from March 11 to April 26, 2022. An exploratory factor analysis was performed using maximum likelihood factor extraction and varimax rotation. Results: The social support scale for nursing students who have experienced clinical practice consisted of a total of three sub-factors and 17 items. The three sub-factors were 'support from family and friends' (eight items), 'support from school, professors, and clinical instructors' (seven items) and 'support from department seniors' (two items). The reliability of the developed scale was found to be high, with a Cronbach's alpha of .93. As a result of verifying the criterion validity of the developed scale, the correlation between the criterion tool and the scale developed in this study was statistically significant. Conclusion: The significance of this study is that it developed a scale to measure social support for the first time among nursing students in Korea.