• Journal of Electrical Engineering and Technology
• /
• v.2 no.3
• /
• pp.366-372
• /
• 2007

Joining thin aluminum alloy is difficult using most welding techniques. Many of the problems are associated with bum-through by the high heat input. Common welding techniques are TIG (Tungsten Inert Gas), MIG (Metal Inert Gas), and PULSE-MIG welding. The method provides more control of the heat balance in the welding arc by taking advantage of the different arc characteristics obtained with each of the two polarities. In this paper, we proposed a new welding method by control DSP 320C32, and the characteristic and experiment result-voltage, current, welding bead, and penetrations by this method are presented.

• Journal of Power Electronics
• /
• v.16 no.1
• /
• pp.268-276
• /
• 2016

A hybrid sinusoidal-pulse current (HSPC) charging method for the Li-ion batteries in electric vehicle applications is proposed in this paper. The HSPC charging method is based on the Li-ion battery ac-impedance spectrum analysis, while taking into account the high power requirement and system integration. The proposed HSPC method overcomes the power limitation in the sinusoidal ripple current (SRC) charging method. The charger shares the power devices in the motor inverter for hardware cost saving. Phase shifting in multiple pulse currents is employed to generate a high frequency multilevel charging current. Simulation and experimental results show that the proposed HSPC method improves the charger efficiency related to the hardware and the battery energy transfer efficiency.

• Journal of Korean Medical classics
• /
• v.29 no.1
• /
• pp.65-76
• /
• 2016

Objectives : Generally, pulsation is influenced by climate change in the realms of nature. However, there is a theory explaining a phenomenon in which the pulse gets weaker and even absent for no reason, without affected by diseases; this is the Theory of South and North Politics with which medical practitioners need to be familiar when taking the pulse of patients. Methods : The researcher considered all the previous annotations and the original text of SuWen (素問) ZhiZhenYaoDaLun(至眞要大論). Results : In Five Elements' Evolutions, JiaJi(甲己) becomes Tu(土), which turns itself into the king, an honorable duty. JiaJi is a period of South Politics because it looks south to give an order while the rest eight years is a period of North Politics because they are headed north to receive an order. Conclusions : Since South Politics years look south as a standard, Cun(寸) is located at the south and Chi(尺) is at the north. Controlling the Heaven energy(司天) is located at the south and Effecting the Earth energy(在泉) is at the north. Therefore, if Sanyin is Controlling the Heaven energy(三陰司天), the Cun pulse is absent; if Shaoyin is Controlling the Heaven energy(少陰司天), Cun pulses on both wrists are not felt; if Jueyin is Controlling the Heaven energy(厥陰司天), the Cun pulse on the right wrist disappears; if Taiyin is Controlling the Heaven energy(太陰司天), the Cun pulse on the left wrist is not felt. In the case of Chi, if Sanyin is Effecting the Earth energy(三陰在泉), the Chi pulse is absent; if Shaoyin is Effecting the Earth energy(少陰在泉), Chi pulses on both wrists are not felt; if Jueyin is Effecting the Earth energy(厥陰在泉), the Chi pulse on the right wrist disappears; if Taiyin is Effecting the Earth energy(太陰在泉), the Chi pulse on the left wrist is not felt. North Politics years appears conversely as compared with South Politics years.

• Journal of Haehwa Medicine
• /
• v.15 no.2
• /
• pp.39-52
• /
• 2006

We came to the conclusion as follows from the research about pulse diagnostic technique (脈診) out of "Nan Jinghoeju jeonjung" (難經滙注箋正). 1. "Nan Jing" is practical medical book for clinician and holds different opinions about three portions and nine takings(三部九候脈法) from Huang Di Nei Jing's Taking the pulse of Bu Jung Chim Chon Kwan Chuk((浮中沈 寸關尺) is a quite creative means which has been a important role to future generation. 2. We pointed the differences between western medical science and traditional medical science. And can explain the pulse in western medicine divided from twelve channels of Oriental Medicine. We can explain special connection between heart and lungs using the theory of systemic & pulmonary circulation in western medicine. And this can be a basement of Lung controls every pulse theory in oriental medicine. 3. We have negative assertion about viewing the human body using theory of Yin and Yang-Five Elements. And have poor opinion of explaining about the matching internal organs to Chon Kwan Chuk using the theory of Yin and Yang-Five Elements. 4. We pointed out the mistake that Porak & Sang hwa act for heart. We took pulses considering heart is a real actual internal organ as others. 5. We denied the theory of Man's Chuk pulse is always weak(男子尺脈恒弱) & Woman's Chuk pulse is always strong(女子尺脈恒盛). The physical form of man and woman is not different from each other considering their inheritances from forefather & same shape of organs. So, we cannot insist on the theory.

• Korean Journal of Oriental Medicine
• /
• v.15 no.2
• /
• pp.101-109
• /
• 2009

The Pulse diagnosis is in the boundary of the Four Examinations, and it is called 切診, or palpation. It has a great impact on people in reminding of the Traditional Medicine that it is probably the first thing that people think of when they hear about Traditional Medicine. Hu-Jun quoted in the Treasured Mirror of Eastern Medicine "東醫寶鑑" that the doctor finds out the deficiency and the excess of the meridian of the patiant through the pulse, and that it is of the utmost necessity to know the "deficiency and the excess" of the meridian to decide the formula (君臣佐使) of the herbal medicine and the acupuncture/moxibustion treatment. The research on the studies of pulse diagnosis have been concentrated on the origin, history, and the theory of the pulse diagnosis throughout the years; however, the number of research on the image from the classics on pulse diagnosis have been less. With this in mind, this paper was written to study more on the origin and the history of the pulse diagnosis as well as to study on the image of pulse diagnosis shown on the classics on Traditional Medicine in China and Korea. The history of the pulse diagnosis has its root on the attempt to find out what is happening inside the body through the indication of the small changes of the pulse that is shown on the outer boundaries of the body. There were various kinds of pulse diagnosis including "Three positions and nine indicators method" and "Carotid pulsation and wrist pulse method" in the ancient period, and wrist pulse-taking method became the most popular since the completion of studying on palpation by 初보. The image of the palpation helps the rudimentary practitioners of Traditional Medicine. They are divided into two large categories, which are the area of diagnosis and the shape of the pulse itself. The historical classics including the image of the pulse diagnosis can be found since the Song Dynasty of China. There are various kinds of image of pulse diagnosis in the classic such as "The picture of the hand meridian" from "脈訣指掌病式圖說", "The picture of the image of meridian" from "察病指南", "The picture of the Seven exterior and Eight interior" from "校正圖注脈訣", and "The picture of the six parts of meridian" from Treasured Mirror of Eastern Medicine "東醫寶鑑". The Treasured Mirror of Eastern Medicine "東醫寶鑑" have analyzed the basic theories and made up the standards of pulse diagnosis by establishing "The picture of the six parts of meridian" based on "The method of placing the viscera and bowels corresponding to cun-guan-qi, or the meridian".

• Journal of Power Electronics
• /
• v.19 no.3
• /
• pp.727-743
• /
• 2019

This paper presents a pulse-width modulation strategy to eliminate the common mode voltage (CMV) with reduced CMV spikes in multilevel inverters since a high CMV magnitude and its fast variations dv/dt result in bearing failure of motors, overvoltage at motor terminals, and electromagnetic interference (EMI). The proposed method only utilizes the zero CMV states in a space vector diagram and it is implemented by a carrier-based pulse-width modulation (CBPWM) method. This method is generalized for odd number levels of inverters including neutral-point-clamped (NPC) and cascaded H-bridge inverters. Then it is extended to the over-modulation mode. The over-modulation mode is implemented by using the two-limit trajectory principle to maintain linear control and to avoid look-up tables. Even though the CMV is eliminated, CMV spikes that can cause EMI and bearing current problems still exist due to the deadtime effect. As a result, the deadtime effect is analyzed. By taking the deadtime effect into consideration, the proposed method is capable of reducing CMV spikes. Simulation and experimental results verify the effectiveness of the proposed strategy.

• Journal of Physiology & Pathology in Korean Medicine
• /
• v.27 no.4
• /
• pp.465-470
• /
• 2013

The purpose of this study is to observe clinically the effects of red onion prescription on type 2 diabetes. The subject of this study were middle-aged people. We measured clinically physiological index, body composition, radial arterial pulse wave before taking medicine and after taking medicine for 4 month (the prescription of red onion). The study results were as follows. In physiological Index, diastolic blood pressure(mmHg)(p<0.001), Fasting blood glucose(mg/dL)(p=0.001), and HbA1c(%)(p<0.001) were decreased significantly after taking medicine. In body Composition, waist-hip ratio(p=0.031), body fat percentage(p=0.006), fat mass(kg)(p=0.005), and muscle mass(kg)(p=0.001) were decreased significantly after taking medicine. Blood Circulation Index, ECO(L/min)(p=0.038) and ECI($L/min/m^2$)(p=0.007) were increased significantly after taking medicine, ECR($dyne^*sec^*cm^{-5}$)(p=0.002), and ECRI($dyne^*sec/cm$)(p=0.001) were decreased significantly after taking medicine for 4 month. The prescription of red onion was showed significant change in physiological index, character of body composition, blood circulation index. Based on this result, it is considered that red onion prescription has the positive effects on type 2 diabetes and blood circulation clinically. In the future, diversified studies on the effects of red onion prescription are needed.

• Korean Journal of Agricultural Science
• /
• v.51 no.1
• /
• pp.9-23
• /
• 2024

This study investigates the physiological and psychological effects of a nature-based outdoor activity program in an environment reflecting the characteristics of forest and coastal areas on 30 firefighters (average age: 40.4 ± 9.8 years) who are frequently exposed to dangerous situations. Blood pressure, pulse pressure, and heart rate variability were used as physiological measurement indicators, and the Korean versions of PANAS (positive affect and negative affect schedule), WEMWBS (Warwick-Edinburgh mental well-being scale), and PRS (perceived restorativeness scale) were used as psychological measurement indicators. For four days and three nights, the participants experienced programs at Hallyeohaesang Nature Center and the surrounding mountains, seas, and islands, utilizing forest resources such as trekking on forest trails, walking barefoot, taking aromatic footbaths, meditating in forest oxygen domes, and lying on relaxation chairs, and programs utilizing marine resources such as taking a boat to an island, walking on forest trails with seascape views, and sailing on a yacht. Participants' systolic blood pressure and pulse pressure decreased, and participants' positive emotions increased and negative emotions decreased after the program. There was a statistically significant increase in mental well-being and perceived restorative environment. Through this study, it was found that nature-based outdoor activity programs based on forest and marine resources are effective in physiological and psychological stability of firefighters. It is hoped that the results of this study will be applied to other high-risk workers for PTSD, who have high stress levels, by combining forest healing and marine healing, and expanding the scope and diversity of programs in more diverse environments and conditions.

• Journal of Power Electronics
• /
• v.14 no.6
• /
• pp.1314-1321
• /
• 2014

A new simplified topology for a dynamic voltage restorer (DVR) based on direct converter with a reduced number of switches is presented. The direct converter is fabricated using only three bi-directional controlled switches. The direct converter is connected between the grid and center-tapped series transformer. The center-tapped series transformer is used to inject the compensating voltage synthesized by the direct converter. The DVR can properly compensate for long-duration, balanced, and unbalanced voltage sag and swell by taking power from the grid. The switches are driven by ordinary pulse width modulation signals. Simulation and hardware results validate the idea that the proposed topology can mitigate sag of 50% and swell of unlimited quantity.

• Proceedings of the KWS Conference
• /
• 2002.10a
• /
• pp.1-14
• /
• 2002

There is a continuous development of the most common welding processes like MMA, MIG/MAG, PAW and SAW. At the same time there is a conversion from stick electrodes to solid and cored wires with an increased productivity as a result. In parallel with these changes new processes are introduced and implemented. The number of Friction Stir Welding installations is starting to grow fast Hybrid laser welding has probably made a technical break through. The Magnetic Pulse Welding process is taking off. The different mechanical joining methods; clinching and self-piercing riveting; must not be forgotten. Structural adhesive is another method to consider.