• 전기학회논문지
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• 제61권9호
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• pp.1221-1225
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• 2012

This paper describes CSC(Current Sourced Converters)-based HVDC operational strategy for voltage stability enhancement in the power system. In case of CSC-based HVDC system, rectifier and inverter consume reactive power up to about 60% of converter rating. Therefore, CSC-based HVDC is basically not useful system for voltage stability even if AC filters and shunt capacitors are attached. But, If the particular power system condition is fulfilled, CSC-based HVDC also can be the rapid reactive power source for voltage stability enhancement using a cooperative control with converter and AC filters/Shunt Capacitors. In this paper, the cooperative control algorithm is presented and simulated to ${\pm}80kV$ 60MW HVDC system in Jeju island.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2007년도 추계학술발표대회 논문집
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• pp.183-186
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• 2007

In modern society, sense of crisis from environmental destruction caused by rapid industrial development, economic growth and improvement of educational level and medicine made environmental preservation and comfortable residential environment a necessary and sufficient condition. Since government conducted 'green building rating system' from 2002, application of pro-environmental elements has been extended. But the concept of substantial pro-environmental housing remains the stage of complex planning yet and application of system to interior space which has the most direct influence on actual dwellers is very poor.

• 한국화재조사학회지
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• 제10권1호
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• pp.87-95
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• 2007

This paper is proposed a novel method to approximate the maximum power for a photovoltaic inverter system and tracking method. It is designed for power systems application and utilities. The proposed Maximum Power Point Tracking (MPPT) control has the advantage to provide a new simple way to approximate the optimal or rated voltage, the optimal or rated current and maximum power rating produced by a solar panel and the photovoltaic inverter. And this straightforward method will be named linear reoriented coordinates method (LRCM) with the advantage that Pmax and $V_{op}$ can be approximated using the same variable as the dynamic model without using complicate approximations or Taylor series. Furthermore tracking method is improved over 50% photovoltaic efficiency. This paper is proposed MPPT using LRMC and tracking method using weather condition of domestic moderate program technique. This paper is proposed the experimental results to verify the effectiveness of the new methods.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.417-420
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• 2003

In this paper, we have designed the ground faults detection and disconnection algorithm at normal rendition of AC 120V to 240V rating voltage. Ground faults in electrical network have the characteristics of low current, 60Hz frequency to 2kHz frequency. The load rendition are no load and 20A load. The controller have the trip level are 6mA with ground faults. Conventional controller does not have the miswiring condition. The Controller algorithm using pic16c71 microprotessor.

• 대한한방내과학회지
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• 제37권2호
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• pp.305-314
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• 2016

Objective: The present study reports on one patient diagnosed with Guillain-Barre syndrome.Method: One patient was treated by Sukjiyanggeun-tang, electroacupuncture, and physical therapy. Any improvement in symptoms was assessed by measuring changes in motor grade; scores in the modified Barthel index, the disability scale, and the numerical rating scale (NRS) of lower back pain; and ambulatory condition during hospitalization.Results: After 48 days of treatment, the patient's symptoms of Guillain-Barre syndrome showed improvement.Conclusions: Traditional Korean medical treatment appeared to be effective in reducing Guillain-Barre syndrome symptoms, but more research is required to confirm these results.

• 대한한의학회지
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• 제43권2호
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• pp.110-116
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• 2022

Objectve: To inform a clinical usefulness of Nangan-geon (暖肝煎) decoction to treat a refractory abdominal pain especially in eldery. Methods: This case report presents an 85-year old male patient who had been suffered with a refractory abdominal pain without any abnormality in laboratory test and radiological examination for 5-years. The clinical outcome was observed by numerical rating scale (NRS) of self-reporting method. Results: Based on his previous multiple normal examination results from Western hospitals and clinical features including thin body (19.6 BMI), nocturnal pain around lower abdomen and cold-sensitivity, author diagnosed him as "deficiency and cold of liver-Qi (肝氣虛寒)" similar to intestinal spasm. After prescription with Nangan-geon (暖肝煎) for one month, all symptoms became improved notably (NRS 5), and almost completely recovered as a level of normal condition in 3 months (NRS 1). Conclusion: This study would show the potential of traditional Korean medicine (TKM) therapies for a refractory functional abdominal pain, and especially efficacy of Nangan-geon against cold-pattern of nonspecific abdominal pain in elderly patients.

• 국제학술발표논문집
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• The 4th International Conference on Construction Engineering and Project Management Organized by the University of New South Wales
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• pp.597-602
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• 2011

A robust asset management methodology is essential for effective decision-making of maintenance, repair and rehabilitation of a bridge network. It can be achieved by a computer-based bridge management system (BMS). Successful BMS development requires a reliable bridge deterioration model, which is the most crucial component in a BMS, and an optimal management philosophy. The maintenance optimization methodology proposed in this paper is developed for a small bridge network with limited structural condition rating records. . The methodology is organized in three major components: (1) bridge health index (BHI); (2) maintenance and budget optimization; and (3) reliable Artificial Intelligence (AI) based bridge deterioration model. The outcomes of the paper will help to identify BMS implementation problems and to provide appropriate solutions for managing small bridge networks.

• 사상체질의학회지
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• 제35권4호
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• pp.86-95
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• 2023

Introduction This is the first case report of a soyangin suffering from burning feet syndrome who reported a significant improvement after taking Sukjiwhanggosam-tang. Case presentation The patient complained of hot feet, pain and numbness that occurred during the night. The patient was diagnosed with 'Yin deficiency diurnal fever disease' and treated with Sukjiwhanggosam-tang as well as acupuncture and cupping therapy. The degree of improvement in heat sensation, pain and numbness was expressed in numeric rating scale compared to the first visit. Conclusion After treatment, the heat sensation, pain and numbness of feet was decreased significantly, and the condition improved much at night.

• 한국항공우주학회지
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• 제31권6호
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• pp.79-87
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• 2003

로켓엔진에서 발생하는 고주파 연소 불안정(음향 불안정)을 억제하기 위해 엔진에 적용되는, 배플이나 음향공과 같은 연소 안정화기구를 설계하고 그 효과를 시험을 통해 검증하였다. 먼저, 음향 감쇠 관점에서, 선형 감쇠이론을 토대로 연소 안정화기구를 설계하였으며, 주요 설계인자로서 감쇠인자를 고려하여 여러 연소실에서의 감쇠인자를 수치적으로 계산하였따. 다음으로, 다양한 작동조건에서, 음향공이 장착된 무배플 연소실에서의 연소시험이 수행되었다. 이를 통해 무배플 연소실의 안정성 특성, 주요 유해주파수 및 유해 음향모드 등이 파악되었으며, 동적 안정성 여분이 상당히 작음이 확인되었다. 이는, 무배플 연소실의 연소 안정화에 현재 사양의 음향공의 효과가 미흡함을 입증한다. 배플의 효과를 입증하기 위해 배플장착 연소실에서 연소 안정성 평가시험을 수행하였고, 뚜렷한 연소 안정화 현상을 관측할 수 있었다. 이는 현 설계사양의 배플이 충분한 감쇠 효과를 가짐을 입증한다.

• 대한한방부인과학회지
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• 제24권3호
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• pp.98-108
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• 2011

Objectives: The purpose of this study is to investigate the relationship between granulocyte/lymphocyte ratio and dysmenorrhea, history of gynecological disease, heart rate varibility(HRV). Methods: From May 1st 2011 to July 10th 2011, a total of 40 female subjects (age 20-39) were recruited. We evaluated the menstruation condition by questionnaires including VAS(Visual Analog Scale), VRS(Verbal Rating Scale) and MVRS (Multidimensional Verbal Rating Scale), also measured subject's WBC differential count and HRV. Results: 1. There was no statistically significant difference in granulocyte/lymphocyte ratio according to menstruation cycle, duration, amount, color, and blood clot. 2. There was no statistically significant difference in VAS, VRS, MVRS mean scores between normal group and abnormal group according to granulocyte/ lymphocyte ratio. 3. The past prevalence of gynecological disease of abnormal group showed significantly higher compared with that of normal group($x^2$=6.578, p=0.010). 4. LF/HF ratio and granulocyte ratio significantly showed positive correlation ($r_s$=0.311 p=0.048) and LF/HF ratio and lymphocyte ratio significantly showed negative correlation($r_s$=-0.319 p=0.045). Conclusion: These findings suggest that the gynecologic diseases are related to disorder of autonomic nervous system, but not dysmenorrhea. And the balance state of sympathetic/parasympathetic nerve infered through granulocyte/lymphocyte ratio and HRV seems to be consistent. However, reconfirmation through further studies is needed.