• 한국정밀공학회지
• /
• 제27권1호
• /
• pp.25-32
• /
• 2010

With the latest automobile technology, though the third generation common rail system requires high injection pressures up to 1,800bar, the next generation diesel engine is expected to require more higher pressures than the third generation. The common rail pipe requires higher strength because it is one of the parts in the common rail system, which is influenced directly by fuel under high pressure. Preform design is very important for preventing head of the common rail pipe from folding in the heading process. In this study, die angle, curvature, outer diameter of die and length of trapped part are selected as main parameters to obtain best preform shape minimizing radius of folding. Therefore optimal design is carried out by finite element analysis and Taguchi method through main parameters. Results of the finite element analysis have good agreements with those of the experiments in the actual field.

• Journal of Ecology and Environment
• /
• 제43권2호
• /
• pp.212-218
• /
• 2019

Background: Allelopathy has been suggested as one potential mechanism facilitating the successful colonisation and expansion of invasive plants. The impacts of the ongoing elevation in atmospheric carbon dioxide (CO₂) on the production of allelochemicals by invasive species are of great importance because they play a potential role in promoting biological invasion at the global scale. Common ragweed (Ambrosia artemisiifolia var. elatior), one of the most notorious invasive exotic plant species, was used to assess changes in foliar mono- and sesquiterpene production in response to CO₂ elevation (389.12 ± 2.55 vs. 802.08 ± 2.69 ppm). Results: The plant growth of common ragweed significantly increased in elevated CO₂. The major monoterpenes in the essential oil extracted from common ragweed leaves were β-myrcene, DL-limonene and 1,3,6-octatriene, and the major sesquiterpenes were β-caryophyllene and germacrene-D. The concentrations of 1,3,6-octatriene (258%) and β-caryophyllene (421%) significantly increased with CO₂ elevation. Conclusions: These findings improve our understanding of how allelochemicals in common ragweed respond to CO₂ elevation.

• 영어어문교육
• /
• 제9권spc호
• /
• pp.167-184
• /
• 2003

This paper is to analyze how Walt Whitman developed the theme and structure of Leaves of Grass with his ideal of democratic vistas. Whitman established his identity as an inspired poet, having faith in the divinity of man based on transcendental belief. After being awakened to the transcendental truth, he practiced his own common world view--his democratic vistas. Whitman searched for the unity with nature and identified his self with "common man and his nation." The poetry expresses "cosmological and national ideology" dedicated to the creation of an ideal nation united in eternal freedom and peace. By portraying common cosmic and national theme in terms of his individual personality, he brought various paradoxical and controversial ideas into one thing, namely "democracy", fusing diversity into unity. As in the symbol of the grass, there is a unity in variety reflected by democracy in a cosmological and political compound. With the form of free verse, he could express his liberal unrestrained and mystical thoughts of democracy. This new form has been associated with the poet's strong consciousness of the need for modernization in his country. He willingly assumed "the role of prophet and public voice for American democrat" with the rolling catalogues and I-persona which formed a sense of the common man and common things of America. Whitman pioneered a democrat literature with simple and dynamic tone and style. He successively pursued the democratic vistas in his Leaves of Grass.

• 한국조경학회지
• /
• 제34권2호
• /
• pp.57-71
• /
• 2006

The purpose of this study was to find common characteristics in everyday landscape cognition that the residents share and to restore the resulting characteristics through citizen-participatory town design. Through the residents participatory workshop supported by the Gwangju Buk-gu District Autonomy and Citizen Academy of Gwangju YMCA, 304 people from eight administrative districts participated in three programs. In each program, photographed landscape images representing everyday conditions of the townscape were presented in several ways: in program 1, the residents' mental map was studied; in program 2, landscape images of real places were matched to locations on a map; and in program 3, the landscapes were scored on a scale from 1 to 5 according to five descriptive categories. The elements that were recognized as common landscape features were public facilities, pedestrian spaces, school areas, and parks and natural green spaces. Additional results including recognition of the participants affection for the village and a common landscape image shared by the people, as inhabitants looked around at the space of their own lives. It seems possible that more creative townscapes can be created by residents through participatory programs.

• 한국정보통신학회논문지
• /
• 제19권6호
• /
• pp.1455-1461
• /
• 2015

마이크로 그리드는 기존의 대규모 전력망이 가진 여러 문제점을 해결할 수 있는 새로운 전력망 개념으로 세계적으로 국가차원에서 연구 및 개발 중이다. 이러한 배경에서 마이크로 그리드 내 장치 및 시스템 간 상호운영기술 및 신규시장 Enabler 확보를 위해 마이크로 그리드용 공통 플랫폼이 개발 중으로 이는 Third-Party 사업자에게 개방형 API 기능을 통해 전력정보를 제공하여 비즈니스 모델을 지원하도록 한다. 마이크로 그리드용 공용 플랫폼에 접속하여 전력 어플리케이션을 개발하고자하는 사업자는 서비스 개발 및 배포를 지원하는 통합 개발 환경이 필요하다. 이에 본 논문은 마이크로그리드용 공통플랫폼의 어플리케이션 개발 및 배포를 위한 PaaS(Platform as a Service) 형태의 서비스 개발도구를 제안한다.

• Journal of Power Electronics
• /
• 제14권2호
• /
• pp.315-323
• /
• 2014

An optimized space vector pulse width modulation (SVPWM) method with common mode voltage elimination and neutral point potential balancing is proposed for an open-end winding induction motor. The motor is fed from both of the ends with two neutral point clamped (NPC) three-level inverters. In order to eliminate the common mode voltage of the motor ends and balance the neutral point potential of the DC link, only zero common mode voltage vectors are used and a balancing control factor is gained from calculation in the strategy. In order to improve the harmonic characteristics of the output voltages and currents, the balancing control factor is regulated properly and the theoretical analysis is provided. Simulation and experimental results show that by adopting the proposed method, the common mode voltage can be completely eliminated, the neutral point potential can be accurately balanced and the harmonic performance for the output voltages and currents can be effectively improved.

• Journal of Chest Surgery
• /
• 제20권4호
• /
• pp.715-722
• /
• 1987

A clinical analysis was performed on 823 cases of the chest trauma experienced at department of thoracic & cardiovascular surgery, Kyung Hee University Hospital during the past 8 years from Jan, 1978 to Aug. 1986. 1. the ratio of male to female patient of the chest trauma was 3:1 in male predominance. 2. The common age groups were 3rd, 4th and 5th decades. 3. The most common causes of the chest trauma was traffic accidents [79.8%] were injured due to non-penetrating injuries and the remainders [166/823, 20.2%] were injured due to penetrating injuries 4. The frequently injured site of the chest trauma was left side of the chest [46%], and the right side was 42% 5. The most common injury from non-penetrating trauma was rib fracture [77.5%], and the incidence rate of flail chest was 59% of all cases of rib fractures. 6. The incidence rate of hemopneumothorax was 42.9% in non-penetrating traumas, and 84.3% in penetrating traumas. 7. The most common method of surgical treatment was closed tube thoracostomy [37.3%], and open thoracotomy was performed in 71 cases [8.6%]. 8. the overall mortality was 2.2%, and common causes of death were cerebral damage, respiratory insufficiency, and hypovolemic shock.

• Journal of Acupuncture Research
• /
• 제29권5호
• /
• pp.177-185
• /
• 2012

Objectives : The objective of this case report was to observe the effect of musculoskeletal ultrasound-guided acupotomy therapy on common peroneal nerve palsy. Methods : From June, 2010 to September, 2012, 3 patients clinically diagnosed as common peroneal nerve palsy were treated with general oriental medicine therapy (acupuncture, pharmacopuncture, moxibustion, cupping, physical therapy, herbal medication) and acupotomy. Results : The foot drop of the patients was remarkably improved. Conclusions : This study demonstrates that oriental medical treatment with acuputomy therapy hasnotable effect in improving symptoms of common peroneal nerve palsy. As though we had not widly experienced in this treatment, more research is needed.

• 가정과삶의질연구
• /
• 제21권6호
• /
• pp.107-115
• /
• 2003

The purpose of this study was to Investigate the spatial composition characteristics of elderly housing facilities in USA, in order to refer them in establishing the basic plan for elderly housing in Korea. The case study performed in this study from July 23 to July 31 is based on ten housing facilities for the elderly located at California in USA. The results of this study were as follows; 1. The type of floor plan was classified into the U type, ㅁ type, L type, and ㅡ type. And they had an outside space called a garden(courtyard). 2. The kinds of common spaces could be grouped as the space for basic living, for leisure, and for convenient living. Also it was all common that the housing facility had shared livingroom, shared diningroom, activity room and garden. The type of the common spaces was categorized into two types, the centralized type where the shared space was located at the center of the housing facilities, and the distributed type, depending on the degree of separation between common spaces and units. ,3. The kinds of units was classified into studio, oneroom, one bedroom and two bedroom.

• 한국전문물리치료학회지
• /
• 제22권3호
• /
• pp.61-70
• /
• 2015

To develop an effective and efficient measurement system for tracking changes of functional status across two measures, it is essential to integrate information and communicate scores across two measures. The lack of communication between two measures leads to score incompatibility. A potential solution would be the development of a crosswalk table between those measures. Prior to creating a crosswalk table, selecting common items between two measures is critical. By using the Oswestry low back pain disability questionnaire (Oswestry) and a short form measuring disability resulting from low back pain, item level statistics as well as differential item functioning (DIF) using the Rasch measurement were investigated. Eighty-two participants with known group validity were recruited. Based on the application of the Rasch measurement model, item difficulties across the two measures were logically and hierarchically ordered. Ceiling effects for both measures were detected, which were not be able to be effectively measured with the two measures. The DIF analysis across the two measures confirmed that five paired items were found to have DIF and five common items were selected for common items. Although five paired items function differently across the Oswestry and the short form, all items of both measures were well targeted study participants. The common items selected by the Rasch measurement model may be effective when creating a crosswalk table between the Oswestry and the short form.