• Journal of Power Electronics
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• v.13 no.5
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• pp.896-908
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• 2013

Under high grid impedance conditions, it is difficult to guarantee the stability of grid-connected inverters with an LCL filter designed based on ideal grid conditions. In this paper, the theoretical basis for output impedance calculation is introduced. Based on the small-signal model, the d-d channel closed-loop output impedance models adopting the converter-side current control method and the grid-side current control method are derived, respectively. Specifically, this paper shows how to simplify the stability analysis which is usually complemented based on the generalized Nyquist stability criterion (GNC). The stability of each current-controlled grid-connected system is analyzed via the proposed simplified method. Moreover, the influence of the LCL parameters on the stability margin of grid-connected inverter controlled with converter-side current is studied. It is shown that the stability of grid-connected systems is fully determined by the d-d channel output admittance of the grid-connected inverter and the inductive component of the grid impedance. Experimental results validate the proposed theoretical stability analysis.

• The Journal of Korea CHUNA Manual Medicine
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• v.3 no.1
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• pp.141-151
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• 2002

Objectives : The purpose of this study is finding out relation of somnipathy and Yin-gyo-maek(陰?脈) Yang-gyo-maek(陽?脈). Methods : 1. We reviewed medical literature about somnipathy and Yin-gyo-maek(陰?脈) . Yang-yo-maek(陽?脈). 2. We studied relation of somnipathy and Yin-gyo-maek(陰?脈) . Yang-gyo-maek(陽?脈). Results : 1. Yin-gyo-maek(陰?脈) Yang-gyo-maek(陽?脈) is channel that is crossing Yin(陰) and Yang(陽). 2. The physio-pathologic phenomenons such as, 'Yin-gyo-maek(陰?脈)', 'Yang-gyo-maek(陽?脈)' are caused by circulatory disorder of depending qi (衛氣). 3. Sleep disoders (such as, hyposomnia, hypersomnia) are caused by the physio-pathologic phenomenon such as, 'Yin-gyo-maek(陰?脈)', 'Yang-gyo-maek(陽?脈)' Conclusions : 1. The period of awakening and sleeping is relative to circulation of depending qi (衛氣) and function of Yin-gyo-maek(陰?脈) Yang-gyo-maek(陽?脈) 2. Acupuncture therapy on Yin-gyo-maek(陰?脈) Yang-gyo-maek(陽?脈) has significant etfect to somnipathy.

• Journal of Physiology & Pathology in Korean Medicine
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• v.29 no.4
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• pp.337-346
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• 2015

Sprain is the injury of meridian-muscle, and is caused by qi and blood obstruction or regional stagnation of qi and blood. So we take the channel points where pain flows. If we take the locations that feel pain, those locations are treatments points and ashi points. So we searched over the ashi points appearing on the patients with wrist sprain. Ashi points appeared on LI5, TE4, SI5 around wrist joints, LI10, LI11, LU6 around elbow joints, LI14, LU3, LU4, PC2 around upper arm. Also, ashi points appeared much on ST17, KI23, PC1, SP18, ST18 around thoracic region, and, on BL15, BL44, BL13 around anterior and thoracodorsal region, in order stated. Ashi points of the highest frequency appeared on LI14 around upper arm, and on LI5, TE4 around wrist joint, and SI5, ST17, KI12, PC1, SP18 appeared with second highest frequency. And ashi points on elbow points and thoracodorsal region appeared with the same frequency. Therefore, it is possible for us to know that the pain location appears in order of upper arm, anterior thoracic region, elbow joint region, and, thoracodorsal region, in treating wrist joints. There was a tendency that pain and movement disturbance recovered more quickly, depending on the pain reduction, as we found out the ashi points closely from stagnated qi and blood caused by wrist arthritis, and relaxed the stiff location. Rubbing treatments in treating pain ashi points is considered to play an important role to reduce pain effectively, so it is necessary to make a further study.

• The Journal of Korean Medicine
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• v.16 no.2 s.30
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• pp.134-148
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• 1995

Dysmenorrhea is probably the most common of all Gynecologic disorders. In the oriental medicine the etiology of Dysmenorrhea is very various, but its mechanism is just that the block of the flow makes the pain. So its treatment is removing the pain by promoting menstrual flow, promoting the flow of qi and by warming channel and activating blood flow. In the various treatments of dysmenorrhea, the method of applying drug at the acupoints which could be combined with feeding herb-medicine by oral was studied. The results obtained here were as follows; 1. In the treatments of dysmenorrhea, the method of applying drug at the acupoints was mainly applied to the type dued to stagnancy of qi and blood stasis, menorrhalgia dued to to cold and dampness, and primary dysmenorrhea. 2. The acupoint used in this treatment was Shin-gwol$(CV_8)$, the umbilicus. 3. The drugs used in this treatment were almost same as oral herb-medicine mainly to activate the blood flow and remove the blood stasis and to promote the flow of qi by warming the channel and remove the pain. 4. The duration of the treatment is, from 3 days before menstration till its period or a few days after it., usually concentrated on fore-postmenstration. 5. The effect of this treatment was reported as excellent. It is more effective to the type of stagnancy of qi and blood stasis, cold and dampness than dued to deficiency of both qi and blood, and dued to the impaired liver-kidney essence. 6. The method of applying drug at the acupoint was as an external treatment, easy, economical, and had no pain and side effect. 7. In the treatments of dysmenorrhea, the method of applying drug at the acupoint could be used as emergency treatment and symptomatic treatment in fore-postmenstration.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.5
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• pp.2124-2141
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• 2018

Recent studies have revealed the efficacy of incorporating delayed channel state information at transmit side (CSIT) in transmission scheme design. This paper focuses on transmit precoder design to maximize the ergodic sum-rate in a two-user Multiple-Input Single-Output (MISO) system with delayed and statistical CSIT. A new transmit strategy which precodes signals in all transmit slots is proposed in this paper, denoted as all time-slots precoding Alternative MAT (AAMAT). There is a common procedure in conventional delayed-CSIT based schemes, which is retransmitting the overheard interferences. Since the retransmitting signal is intended to both users, all previous schemes tend to use only one antenna. We however figure out an improvement in spectral efficiency could be realized if all antennas can be utilized. In this paper, we detail the design of the procoder which enabling all antennas and also we compute a lower bound of the ergodic sum-rate in an ideal condition. In addition, simulation results demonstrate the superiority of our proposed scheme.

• ETRI Journal
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• v.43 no.3
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• pp.436-446
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• 2021

In this paper, we propose an energy-efficient unmanned aerial vehicle (UAV) relaying network. In this network, the channels between UAVs and ground transceivers are model-free. A UAV acting as a flying relay explores better channels to assist in efficient data delivery between two ground nodes. The full-duplex relaying mode is applied for potential energy efficiency (EE) improvements. With the genetic algorithm, we manage to optimize the UAV trajectory for any arbitrary radio map scenario. Numerical results demonstrate that compared to other schemes (eg, fixed trajectory/speed policies), the proposed algorithm performs better in terms of EE. Additionally, the impact of self-interference on average EE is also investigated.

• Journal of Distribution Science
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• v.19 no.1
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• pp.5-15
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• 2021

Purpose: This study explores the types of relational benefits that generate loyalty to room-sharing services among Chinese customers based on the relationship marketing literature. The study also examines the moderating effect of alternative attractiveness on this relationship. Research design, data and methodology: Based on research hypotheses, questionnaires with items measuring the proposed constructs in three dimensions, including relational benefits, alternative attractiveness, and customer loyalty, were designed to test the hypotheses. Data were collected via an online questionnaire of 220 room-sharing service customers in China. Results: Results verify the effects of relational benefits on customers' loyalty to room-sharing services and the mediating effect of alternative attractiveness. More specifically, confidence, social, and safety benefits positively affect customer loyalty to room-sharing services, and alternative attractiveness moderates only the effect of social benefits. Conclusions: The results suggest that room-sharing service providers should concentrate on providing confidence, social, and safety benefits to maintain long-term relationships with customers. This study also provides practical implication for building relationships between channel members in service distribution channels. The study concludes that without customer relationships marketing for managing collaborative and social communication channels, the entire distribution channel might lose out eventually.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.410.1-410.1
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• 2014

A soft-lithographic top-down approach is combined with an epitaxial layer transfer process to fabricate high quality III-V compound semiconductor nanowires (NWs) and integrate them on Si/SiO2 substrates, using MBE-grown ultrathin InAs as a source wafer. The channel width of the InAs nanowires is controlled by using solvent-assisted nanoscale embossing (SANE), descumming, and etching processes. By optimizing these processes, the NW width is scaled to less than 50 nm, and the InAs NWFETs has ${\sim}1,600cm^2/Vs$ peak electron mobility, which indicates no mobility degradation due to the size.

• The Journal of Korean Medical History
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• v.15 no.1
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• pp.25-42
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• 2002

Wang Bing reorganized "The Yellow Emperor's Inner Canon Essential Questions" by adding 7 more volumes to the original 9 volumes and made it 24 volumes. And also rearranged the order in "preservation of health", "yinyang and five phases", "visceral manifestation", "treatment", "pulsation", "the channels", "diseases", "acupuncture ", "movement of the qi", "medical virtue", "wanton theory" etc. Though this, Wang Bing hoped the "The Yellow Emperor's Inner Canon Essential Questions" to be reborn into a systematic and methodical medical book. Taoism, which is one of the characteristics of Wang Bing's medical conception, is revealed in both the contents of the book and the rearrangement of the book's order. Another feature is that he explains most of the diseases by the channel theory. His insists the script be interpretated in a new way that fits the situation and not to be bound to the words it self. And this also shows one of his conception of medicine.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.11a
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• pp.211-214
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• 2006

이동통신의 발달과 함께 모바일을 통한 VoD서비스 요구 또한 증가하고 있는 추세이다. 모바일 VoD서비스는 언제, 어디서든 비디오 정보를 쉽게 액세스할 수 있는 편리함과 교육, 연예, 비즈니스와 같은 많은 어플리케이션 영역에서 유용하게 사용되고 있다. 그러나 모바일 시스템의 특성상 클라이언트의 빈번한 이동과 끊어짐으로 원활한 VoD서비스를 제공하기에는 많은 어려움이 존재하고 있다. 보다 안정된 모바일 VoD서비스를 위한 방법으로 브로드캐스트 기법의 중요성이 강조되고 있으며 본 논문에서는 모바일 VoD환경에서 효율적인 브로드캐스트를 위한 채널 할당 기법을 제안하고자 한다.