• Journal of Institute of Control, Robotics and Systems
• /
• v.3 no.3
• /
• pp.227-237
• /
• 1997

Autonomous Underwater Vehicles(AUVs) have become an important tool for various purposes in subsea: inspection, recovery, construction, etc., and the development of autonomous control system is luglay desirable- thete zffe many problems associated with designing the control system for AUV due to unknown underwater envimn-Tnent, the possibility of subsystem failures, and unpredictable changes in the dynamics of the vehicle. In this paper, an autonomous control system based on the intelligent control theory to enhance operation efficiency of the ALTV is presented. The control system has a hierarchical structure which consists of mission planning level, mission control level, navigation level, and execution level. The performance of the control system is investigated by computer simulation. The results show that the proposed control system can be applied successfully to the AUV in spite of the possibility of failures in the vehicle and the collision hazard in the sea environment.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2013.05a
• /
• pp.281-283
• /
• 2013

In this paper, standing water level control system and a comparison of existing methods (anchor, PDD, DM) and economic analysis was conducted. 1) Cost PDD method (6%), DM system (4%), and the SAL standing water level control system (4%), except for the anchor system is similar to the construction of three methods based on the portion of the anchor system was analyzed that. 2) construction and maintenance costs compared with the sum of the partial was, anchor system (100%), PDD method (39%), DM system (37%), the SAL standing water level control system (21%), the SAL standing water level control system was identified as the lowest cost method of.

• 제어로봇시스템학회:학술대회논문집
• /
• 1996.10b
• /
• pp.195-198
• /
• 1996

The control objective of drum level of boiler in thermal power plant is to maintain drum level at constant setpoint regardless of disturbance such as main steam flow. The initial response of the drum level loop process is in a direction opposite to the final response. The drum level loop shows inverse response when the power is changed abruptly. We adopt fuzzy controller using knowledge base considering system dynamics for controlling drum level. Finally, the simulation result using the digital simulator for boiler system in Seoul Power Plant Unit 4 shows the validity of fuzzy controller.

• Biomedical Science Letters
• /
• v.10 no.4
• /
• pp.453-457
• /
• 2004

The welders and car painters are frequently exposed to heavy metals such as lead, zinc, cadmium and chromium, and those are a major source of heavy metal poisoning. This study was carried out to investigate the relationship of the heavy metal level in blood by age, working duration, and smoking status among 105 industrial workers and 88 general people in Gyeongnam province from October 2003 to October 2004. The heavy metal level in blood was analyzed by atomic absorption spectrophotometer. Mean blood lead level in exposed group and control group was 8.40±4.67μl/dl, 1.82±1.35μl/dl, respectively. Mean blood zinc level in exposed group and control group was 9.43±5.38 ㎍/ml, 2.89±1.79㎍/ml, respectively. Mean blood cadmium level in Exposed group and control group was 1.53±1.05μl/dl, 0.60±0.49 μl/dl, respectively. Mean blood chromium level in exposed group and control group was 0.89±0.76μl/dl, 0.68±0.63μl/dl, respectively. Lead, zinc, cadmium and chromium level in blood of exposed group was significantly higher than that of control group. In the comparison of smoking status, lead, zinc and cadmium level of smoker's was significantly higher than that of non-smoker's. Comparison of heavy metal level by age, lead, zinc, cadmium level in 40's, 50's (exposed group) in blood significantly higher than that of 20's, 30's. In exposed group, working duration has no significant difference. In conclusion, smoking was the most hazardous factor to elevate in blood heavy metal levels.

• Management & Information Systems Review
• /
• v.5
• /
• pp.227-247
• /
• 2000

This study is aimed at searching for the ways to effectively cope with the conflicts found among the members of the hospitals by analyzing the conflict control practiced differently depending on the scale of the organization and characters of its members. The result of analysis into the types of conflict control by the members of the hospital comprising a multitude of manpower is presented as follows. 1. The hypothesis 1 which assumes that the sex will determine the type of conflict control is adopted in part at the level of p<0.05. 2. The hypothesis 2 which assumes that the working position will determine the type of conflict control is adopted in part at the level of P<0.05. 3. The hypothesis 3 which assumes that the age will determine the type of conflict control is adopted in part at the level of p<0.05. 4. The hypothesis 4 which assumes that the size of hospitals will determine the type of conflict control is adopted in part at the level of p<0.05. 5. The hypothesis 5 which assumes that the career will determine the type of conflict control is adopted in part at the level of p<0.05. 6. The hypothesis 2 which assumes that the educational background will determine the type of conflict control is adopted in part at the level of p<0.05. This study requires extended follow-up study to cover the cause of conflict and job satisfaction of the medical manpower.

• Journal of the Korean Home Economics Association
• /
• v.33 no.3
• /
• pp.149-163
• /
• 1995

This study investigated the relation between children's internal-external locus of control and social comtetency. The subjects of this study were 453 mothers and their children of third and sixth grades in the five elementary schools located in Seoul. The modified version of Nowicki and Strickland's CN-SIE(Locus of Control Scale for Children) was administered to asses the children's internal-external locus of control. To assess the children's social competency, questionaire developed by Lee Kyung Hee(1993) was used. The major findings of this study were as follows : 1) There was significant interaction between grade level and sex in children's locus of control. Significant difference was found in children's locus of control in terms of children's social status level. 2) Significant difference were found in children's social competency in terns of children's sex and social status level. 3) Children's social comtetency was positively related to the internal locus of control orientation. 4) The relation between children's internal-external locus of control and social competency for boys was greater than that for girls. The relation between children's locus of control and social competency was not influenced by children's grade level, but affected by children's social status level. Social status level was positively related to the relation of the two concerned variables.

• Journal of Physiology & Pathology in Korean Medicine
• /
• v.17 no.6
• /
• pp.1412-1418
• /
• 2003

This experimental study was designed to investigate the effects of Yukgunja-tang(YGJT) on the change of weight and serum total cholesterol, HDL-cholesterol, LDL-cholesterol, triglyceride, free fatty acid, total lipid, phospholipid level in obese mice induced by high fat diet. I fed normal group fed normal diet and administered DDW 0.2㎖ during 7 weeks, control group fed high fat diet and administered DDW 0.2㎖ during 7 weeks, sample A group fed high diet and administered YGJT 300mg/kg 0.2㎖ during 7 weeks, sample B group fed high diet and administered YGJT 500mg/kg 0.2㎖ during 7 weeks. The results were as follows ; 1. Sample A and Sample B were significantly decreased body weight(4weeks) and serum free fatty acid level in comparison with control group. 2. Sample A was significantly decreased body weight(7weeks), serum total cholesterol level and serum total lipid level, but significantly increased serum HDL-cholesterol level in comparison with control group. 3. Sample A was decreased serum LDL-cholesterol level, serum triglyceride level and serum phospholipid level in comparison with control group. 4. Sample B was increased serum HDL-cholesterol level in comparison with control group. 5. Sample B was decreased body weight(7weeks), serum total cholesterol level, serum LDL-cholesterol level, serum triglyceride level, serum total lipid level and serum phospholipid level in comparison with control group. According to above results, I suggest YGJT is able to be used for the herbal medication of obesity.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1996.04a
• /
• pp.398-402
• /
• 1996

This paper addresses the design and the gait control of quadruped walking robot. First, we concern the mechanical and electronical(control system) hardware of walking robot, and the second is the results of experiments. The walking robot is the most suitable form to substitute fot human being. So walking robot is worthy of research. The quadruped walking robot and control system is the simplest type of walking robot, therefore we designed a small seale robot for realization of static gait. The robot is designed commpactly and its legs are constructed parallel link type and able to move freely in space. Control system consists of one upper level controller and four lower level controllers. The upper level controller plans the walking path and commands the low level controllers to follow the planned path. The main function of low level cotrollers is control of motors. Total number of motors is twealve and they operate four legs. And robot is ordered to walk and realize static wave gait.

• Korean Journal of Child Studies
• /
• v.12 no.1
• /
• pp.91-112
• /
• 1991

The impact of gender, sex-role identity and cultural background on self - control behaviors was studied with the use of reports from 410 college students(201 Koreans and 209 Americans), who were administered both the Bem Sex Role Inventory and the Missouri Self Control Instrument. Gender, sex - role identity and cultural background significantly affected self - control and satisfaction. Regardless of cultural background, males showed a higher level of self - control and satisfaction than females. Androgenous students from both nations used a higher level of expressed/yielded self - control and more satisfied than the students with other sex - role identities. There were some differences in self - control between the Korean and American students. For the American students, the level of expressed self - control was the critical factor in explaining self - control behavior, whereas the level of yielded self - control was the critical factor for the Korean students. This was explained as a phenomenon of culture - bound relationships. Regardless of sex and sex - role identity, the level of satisfaction of Korean students was significantly lower than that of American students. The present results suggested that Korean students have some sort of conflict between self - control and satisfaction. The conflict can probably be attributed to the recent influx of western culture emphasizing goal - oriented control.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.19 no.1
• /
• pp.111-121
• /
• 1995

A fuzzy control algorithm of bell-type membership functions and 9 rules is constructed for narrow range level control of steam generators in nuclear power plants. It is implemented at a field digital distributed controller, a Westinghouse-made controller called Westinghouse Distributed Processing Family(WDPF). Performance for level control of the developed fuzzy controller is compared with that of conventional controller, both at the field controller. For these comparisons, both the fuzzy control algorithm and the conventional PI control algorithm were carefully tuned. Also the sampling time for optimal performance was investigated. The results show that the fuzzy control algorithm is not only better in performance than the conventional algorithm but also much easier to be tuned by operators in the field.