• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.15 no.3
• /
• pp.203-209
• /
• 2003

Control algorithms of an air handling unit by using the mixing box plenum pressures were developed and verified by experiments. Control algorithms developed for this study were the setpoint algorithms for the outdoor damper position, the outdoor/fixed plenum pressure, and the return/exhaust plenum pressure. The outdoor/fixed plenum pressure setpoint was used to control the bypass damper position, and the return/exhaust plenum pressure setpoint was used to control the return fan speed. Experimental results showed the good control of the required outdoor air demand. Therefore, setpoint algorithms developed for this study may effectively be applied for the control of the VAV air handling unit.

• YAKHAK HOEJI
• /
• v.43 no.1
• /
• pp.48-54
• /
• 1999

Effects of zinc chloride (Zn) on the immune responses of lipopolysaccharide (LPS) were studied by using ICR mice. Mice were divided into 4 groups (10 mice/group), and Zn was given to the mice with i.p. injection at 0.3 mg/kg 5 times a week for 14 days, and 1 hr after Zn administration, LPS was given with i.p. injection at 5 mg/kg twice a week. Mice were immunized and challenged with sheep red blood cells (SRBC). Immunobiological responses were evaluated by humoral, cellular and nonspecific immunity. LPS treatment significantly increased the relative weights of spleen and thymus, hemagglutination titer (HA) and proliferation of splenocytes compared with those in controls, but significantly decreased the body weight gain. Zn treatment significantly increased proliferation of splenocytes and circulating leukocytes compared with those in controls. Combination of Zn and LPS significantly decreased the body weight gain and proliferation of splenocytes compared with those in controls. Combination of Zn and LPS significantly decreased HA and proliferation of splenocytes than in LPS alone. These findings indicate that zinc lowered the humoral immune responses of LPS.

• Journal of Physiology & Pathology in Korean Medicine
• /
• v.24 no.6
• /
• pp.921-923
• /
• 2010

Although Bi(脾 Spleen) is a major organ which controls digestion and absorption in Korean medicine, there also introduced another function of bi, which is called 'bitonghyul(脾統血)' that means the spleen controls(holdings) the blood. While the spleen is involved in the function of blood generation through the digestion and absorption of food, 'bitonghyul' is another expression regarding function of the spleen. The meaning of 'bitonghyul' is related with the function of keeping the blood flowing within the blood vessels, hemostasis. Comparing the function of the spleen with the mechanisms of hemostais, it is concluded that 'bitonghyul' is a physiological effects which affect hemostatic mechanisms via absorption of vitamin K.

• Proceedings of the KIEE Conference
• /
• 1987.11a
• /
• pp.351-354
• /
• 1987

In this paper, an adaptive control scheme is applied to the speed control system of a synchronous AC servo motor. The adaptive control system using Ioannou's modified adaptation law is shown to be robustly stable in the presence of current control error and load torque disturbance. The computer simulation demonstrates the rapid compensation of rotor speed deviation due to load torque disturbance.

• International Journal of Naval Architecture and Ocean Engineering
• /
• v.11 no.2
• /
• pp.865-874
• /
• 2019

A controller for an underwater glider is presented. Considered underwater glider is a torpedo-shaped autonomous underwater vehicle installing adjustable buoyancy bag and movable battery in it. The controller is composed of an LQR controller to maintain zigzag vertical movement for gliding and two PD controllers to control elevator/rudder angles. The LQR controller controls the pumping speed into the buoyancy bag and the moving speed to locate the battery. One of the PD controller controls the elevator angle to assist the LQR controller, and the other controls the rudder angle to adjust the direction of the underwater glider. A reduced order Luenberger observer is adopted to estimates the center of gravity of the glider and the buoyancy mass that are essential but cannot be measured. Mathematical simulation using Matlab proved the validity of the proposed controller to obtain better performance than conventional LQR only controller under the influence of sea current.

• Proceedings of the SAREK Conference
• /
• 2008.06a
• /
• pp.84-89
• /
• 2008

The biosafety laboratory HVAC control technology may be applied in order to protect contamination of the researcher, supervisor and to prevent diffusion of biological pollution. In this study, a biosafety level, general configuration of control system, differential pressure control, distributed control system and network structure were discussed. These systems able to increase laboratory safety and efficiency of HVAC system.

• Journal of Environmental Health Sciences
• /
• v.19 no.1
• /
• pp.57-65
• /
• 1993

The cultivtion efficiencies of enzyme treated nightsoil liquid manure were investigated. As a result of applying the liquid manure prepared by the nightsoil digestion due to aerobic or anoxic conditions with enzyme treatement to cultivate greenstuffs as compared with the controls (conventional cultivation) due to application of none enzyme treated fertilizer, the yield was markedly increased. In the cases of kidney bean, seedleaves were increased over 2~4 times and stem growth and diameter was increased 40% as compared the controls. Finally, cultivation yield of liquid manure prepared by the nightsoil aerobic or anoxic digestion with enzyme treatment were more increased as compared with the controls.

• YAKHAK HOEJI
• /
• v.43 no.1
• /
• pp.98-103
• /
• 1999

Effects of Astragali Radix extract (AG) on the cell mediated-and nonlpecific immunotoxic responses of zinc chloride (Zn) were studied usign ICR mice. Mice were divided into 4 groups (10 mice/group), and Zn was given to the mice 1 hr after i.p. injection with 0.5g/kg of AG by i.p. injection daily for 10 days at a dose of 25 mg/kg. Immune responses on the responses on the relative weight of thymus, delayed-type hypersensitivity to SRBC (DTH), phagocytic activity and circulating leukocytes were evaluated. Zn treatment decreased body weight gain, the relative weight of thymus, DTH and circulating leukocytes compared with those in controls. AG treatment increased DTH, phagocytic activity and circulating leukocytes compared with those in controls. Combination of AG and Zn increased DTH and circulating leukocytes compared with those in controls, but decreased body weight gain and the relative weight of thymus. These findings indicated that AG decreased immunotoxicity of Zn on the DTH and circulating leukocytes.

• Proceedings of the Korea Institute of Convergence Signal Processing
• /
• 2003.06a
• /
• pp.122-125
• /
• 2003

Consuming against a recently internet and the Mobile machinery and tools is expanded and it uses controls the machinery and tools of existing technique an internet and in necessity It made a wool one page from the dissertation which it tries to follow hereupon and web it led and controls the machinery and tools system design. It uses a Mobile one web server and the technique which controls the machinery and tools that application field the home network, telemetries the back is visible With the fact that the next continuous research will be necessary because wide.

• Proceedings of the SAREK Conference
• /
• 2006.06a
• /
• pp.1150-1155
• /
• 2006

In a heating control system, the indoor temperature controller transfers temperature signals inputed from the temperature sensor and the user to the valve controller. The valve controller recieves these signals then the valve controller controls the valve driving motor on two position control and controls the indoor temperature. When setting up a new valve driving motor from a long distance it is necessary to set up a new valve controller. But occasionary, due to construction, it is impossible to wire between the existing valve controller and the new valve controller. In this situation, the new and existing valve controllers can communicate via power line communication. In this paper it is proposed heating control system controls on two position control via power line communication.