포화지방산계 LB 막의 수평방향에 대한 전기적 특성 비교

김도균,최용성,장정수,권영수 ( Do Kyun Kim,Yong Sung Choi,Jeong Soo Chang,Young Soo Kwon ) 한국전기전자재료학회 1997 한국전기전자재료학회 춘계학술대회논문집 Vol.1997 No.0

부착면 표면물질에 의한 성능 왜곡을 최소화한 이중 선로의 비대칭 다이폴 형태 태그 안테나 설계

김도균,추호성,Kim, Do-Kyun,Choo, Ho-Sung 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.4

본 논문에서는 부착될 물질이 가지는 전기적 특성에 의한 성능 변화가 적은 이중 선로의 비대칭 다이폴 형태 RFID 용도 태그 안테나(Asymmetric Dual-arm Dipole Antenna: ADDA)를 제안하였다. 제안된 태그 안테나는 상용 의료 폐기물 수거용 플라스틱 밀폐 용기(${\varepsilon}_r=1.7,\;tan\;{\delta}=0.002$)에 부착하여도 안테나의 동작 특성 변화가 적도록 설계되었다. 안테나의 세부적인 설계변수는 자유공간과 인식 대상 물체에 부착시 우수한 인식거리 성능을 나타내도록 Pareto 유전자 알고리즘을 사용하여 최적화하였다. 최적화 태그 안테나는 $100\;mm{\times}50\;mm$의 크기를 가지며, 3.7 %의 반사 손실 대역폭($S_{11}$< -10 dB)을 가지고 80 %의 복사효율을 나타내었다. 인식 거리 측정 결과, 자유공간에서 정면 방향(broadside) 5.3 m, 의료 폐기물 수거용 플라스틱 밀폐 용기에 부착시 최대 5.5 m의 인식거리 성능을 가지는 것을 확인하였다. In this paper we proposed the tag antenna with a low performance distortion from an attached surface material using the asymmetric dual-arm dipole antenna(ADDA) structure. The tag is designed to exhibit low performance changes when the tag is attached on a target object(the medical litter receptacle, ${\varepsilon}_r=1.7,\;tan\;{\delta}=0.002$). Detail design parameters for the proposed antenna are optimized to maintain a good readable range in free-space as well as on a target object. The size of the optimized antenna is $100\;mm{\times}50\;mm$. The antenna shows the matching bandwidth($S_{11}$< -10 dB) of 3.7 % and the radiation efficiency of 80 % at the operating frequency. Finally we confirmed the readable range of the tag antenna by measurement and it shows about 5.3 m in free space and 5.5 m on the target object.

드럼형 마찰대전장치를 이용한 혼합플라스틱의 정전선별

김도균,조희찬,전호석,Kim Do Kyun,Cho Hee Chan,Jeon Ho Seok 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.1

마찰대전을 이용한 정전분리는 서로 상이한 물질간의 마찰을 통해 서로 다른 극성으로 하전시켜 이를 전기장내에 통과시켜 분리하는 기술이며, 플라스틱과 같은 부도체입자들의 정전분리에 많이 사용된다. 본 연구에서는 연속식 드럼형 마찰대전장치를 개발하고 이를 폐건축 및 폐가전 플라스틱의분리에 적용시켰다 분리대상 플라스틱은 폐건축 자재의 경우 PE/PVC 혼합시료를 대상으로 하였으며, 폐가전의 경우 ABS/PS/PP의 혼합시료를 대상으로 하였다. 건축자재 혼합플라스틱 및 가전제품 혼합플라스틱 모두 드럼형 마찰대전장치를 이용할 경우 실험한 조건에서 무게기준으로 95%이상의 순도조건에서 95%이상의 회수율을 보였다. Triboelectrostatic separation process is a technology that different particles charged after contact and rubbing different materials are separated in a high electric field. This technology has an advantage in that it can be used for separating non-conducting materials such as plastics unlike other electrostatic separation processes. There are two objectives in this study. One is to develop an effective continuous tribo-electrostatic separation process. The other is to apply the developed device for the separation of mixed plastics. Results show that almost all tested plastics reaches over 95% in yield and grade after separation.

건설회사의 생산성 향상을 위한 조직몰입에 관한연구

김도균,강경식,Kim, Do-Gyun,Kang, Kyung-sik 대한안전경영과학회 2017 대한안전경영과학회지 Vol.19 No.1

This paper provides a basic organizational commitment research for the study was conducted academic research, especially acidic improvements in the construction industry for a job commitment on organizational commitment. In this paper, first results are derived for literature to study and improve productivity and derive a major cause of job involvement of construction companies based on it for critical that the rationale organization.

광양만 임해 매립지 느티나무 식재지 토양의 수직적 특성 변화

김도균,김용식,Kim Do-Gyun,Kim Yong-Shik 한국조경학회 2005 韓國造景學會誌 Vol.33 No.2

This study was carried out to elucidate the vertical characteristics of soil properties at six planted sites of land reclaimed from the sea, in Gwangyang Bay, Jeollanam-do Province, Korea. Based on the types of planting site, the chemical properties of the vertical soil layers varied. The vertical variation was great in the planting sites $Z_1\;and\;Z_2$, but less varied in the mounded planting sites $Z_3,\;Z_5,\;and\;Z_6$. Major reasons for the vertical variation in soil chemical properties included differences in the accumulation of organic matter, soil disturbance by heavy construction equipment, and heterogeneity of soil properties between soil horizons. As soil depths increased, soil salts varied. The electrical conductivity (ECe) increased in the lower areas of planting sites $Z_1\;and\;Z_2$, and the disturbed, saline planting site $Z_3$, but decreased in the lower areas of $Z_3,\;Z_5,\;and\;Z_6$. These tendencies did not coincided with exchange cation concentrations $(Na^+,\;K^+,\;Mg^{++},\;Ca^{++})$. Both total carbon (T-C) and total nitrogen (T-N) accumulated more in the lower areas of planting sites than in the higher areas, and levels were higher closer to the surface than in the soil depths. It is supposed that these tendencies are related to the accumulation of fallen leaves or other organic matter at the soil surface, and the soil chemicals then slowly move downward from the surface. Impediments to tree growth included soil hardiness, high soil salinity and exchangeable cation concentration, low soil moisture content, acidic or alkaline soil, low organic matter, heterogeneity of soil texture and establishment of soil stratification.

구연산과 섬유소의 치근면 도포가 성견 치주조직 재생에 미치는 영향

김도균,박재완,이재목,서조영,Kim, Doe-Gyeun,Park, Jae-Wan,Lee, Jae-Mok,Suh, Jo-Young 대한치주과학회 1994 Journal of Periodontal & Implant Science Vol.24 No.1

성견 견치의 인위적 골결손부에 치근활택술 시행 후, 섬유소 처리, 구연산 탈회, 섬유소 처리및 구연산 탈회가 치주조직 재생에 미치는 영향을 관찰하기 위하여 치근장축 방향으로 절편을 1일, 3일, 7일, 14일, 21일 간격으로 제작하여 광학현미경으로 관찰한 결과 다음과 같은 결론을 얻었다. 술후 1일째 대조군을 제외한 섬유소 단독도포군, 구연산 단독도포군 및 섬유소-구연산 병용도포군에서 섬유소양이 대차없이 밀집되어 나타났으며, 술후 3일째부터 대조군과 섬유소 단독도포군에서 상피의 하방성장이 관찰되기 시작하였고 구연산 단독도포군과 섬유소-구연산 병용도포군에서는 상피의 하방성장이 거의 관찰되지 않았다. 술후 1주째부터 각 군의 섬유소가 부분적으로 교원섬유로 대치되기 시작하였으며 2주후 각 군간에 대차없이 대부분의 섬유소기 교원섬유로 대치되는 양상을 보였으며 , 술후 3주째에 구연산 단독도포군과 섬유소-구연산 병용도포군에서 부분적으로 교원섬유의 규칙적인 배열상이 관찰되었고 대조군 및 섬유소 단독도포군에서는 거의 관찰되지 않았다. 구연산 단독도포군과 섬유소-구연산 병용도포군에서는 술후 2주째부터 치근흡수가 관찰되었으며 3주째에는 병 용도포군에 비해 구연산 단독도포군에서 더 많은 치근흡수가 관찰되었다. The purpose of this study was to evaluate the effects of citric acid and fibrin on the regeneration of periodontal tissues using 4 normal canines of five dogs. Mucoperiosteal flap was raised and experimental defects were made at the buccal root surfaces about $4{\times}6mm$ in length. The denuded root surfaces were covered using coronally repositioning technique after root planing alone at left lower canine, root planing plus fibrin at rigth lower canine, root planing plus citric acid at left upper canine or root planning plus citric acid and fibrin at right upper canine. All of the specimens were tangentially cut(about $3-5{\mu}m$)and available for histologic analysis 1, 3, 7, 14 and 21 days after operations. The results were as follows : At one' day after operations, the amounts of fibrin were similarly higher in the group I, II and III than control group and at 3 days after operations, the apical migrations of the long junctional epithelium were prominent in the control group and group I. At 7 days after operations, the fibrin meshworks of each group were partly changed to the collagen fibers and characteristics of the fibers were almost collagenous rather than fibrinous at 14 days after operations and at 21 days after operations, the orientation of collagen fibers were partly normal in group II and group III, but not in control group and group I. Root resorptions were visible in group II and group III at 14 days after operations and more significant in group II than group III at 21 days.

Effect of corrosion on the ultimate strength of double hull oil tankers – Part I: stiffened panels

김도균,박대겸,Jeong Hwan Kim,김상진,김봉주,서정관,백점기 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.4

Age-related problems especially corrosion and fatigue are normally suffered by weatherworn ships and aging offshore structures. The effect of corrosion is one of the important factors in the Common Structural Rule (CSR) guideline of the ship design based on a 20 or 25 years design life. The aim of this research is the clarification of the corrosion effect on ultimate strength of stiffened panels on various types of double hull oil tankers. In the case of ships, corrosion is a phenomenon caused by the ambient environment and it has different characteristics depending on the parts involved. Extensive research considering these characteristic have already done by previous researchers. Based on this data, the ultimate strength behavior of stiffened panels for four double hull oil tankers such as VLCC, Suezmax, Aframax, and Panamax classes are compared and analyzed. By considering hogging and sagging bending moments, the stiffened panels of the deck, inner bottom and outer bottom located far away from neutral axis of ship are assessed. The results of this paper will be useful in evaluating the ultimate strength of an oil tanker subjected to corrosion. These results will be an informative example to check the effect of ultimate strength of a stiffened panel according to corrosion addition from CSR for a given type of ship.

고체 염기성촉매하에서 메탄올에 의한 아닐린의 알킬화 반응

김도균,이태진 ( Do Gyeun Kim,Tae Jin Lee ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1997 No.0

조경시공분야 신입사원들의 이직의도에 영향을 미치는 요인

김도균,유일,Kim, Do-Gyun,Ryu, Il 한국조경학회 2015 韓國造景學會誌 Vol.43 No.2

This study aimed to identify influencing factors such as job environment, job characteristics, and job competency as they are related to newcomer turnover intentions in the construction of landscape architecture, Korea. The results based on statistical analyses are follows as: The turnover experience of newcomers in the field of landscape architecture construction was 54.5%, about 1.6 times higher than in other fields. The influencing factors among newcomer turnover intentions in the construction of landscape architecture were workload(p<0.01), job suitability, and personal relations(p<0.01), while in job autonomy, work conditions, job competency, job identity, job variety, and job compensation were not statistically significant. This study found that key important factors of dependent variables that conceptually explain the influence of turnover intentions among newcomers differed between the construction of landscape architecture and other fields. The most important factors in turnover intention were workload>personal relationship>job suitability among independent factors. This study implied that efforts for improvement are needed in areas of workload, personal relations, and job suitability to mitigate newcomer turnover intentions so as to establish common and personal goals in the field of landscape architecture construction because turnover intention could lead losses in human resources, time, economy, and psychological health. In conclusion, this study suggested the importance of efforts for human resource management to reduce turnover intentions among newcomers in the field of landscape architecture construction. 본 연구는 조경시공분야 신입사원들의 직무환경, 직무특성, 직무역량이 이직에 미치는 영향을 개념적으로 파악하기 위하여 연구가설과 연구모형을 개발하여 설문에 의한 실증 분석하였다. 조경시공분야 신입사원들은 입사 3년 이내에 이직경험이 54.5%로 우리나라의 다른 분야 대졸신입사원들보다 1.6배 정도 더 높았다. 조경시공분야 신입사원들의 이직의도에 크게 영향을 미치는 것은 사회통계학적으로 직무량(p<0.01), 직무적합성(p<0.1), 대인관계(p<0.1)에 유의하였고, 나머지 직무자율성, 직무여건, 직무역량, 직무정체성, 직무다양성, 직무보상은 통계학적으로 유의하지 않았다. 조경시공분야 신입사원들의 이직의도에 크게 영향을 미치는 요인은 직무량>대인관계>직무적합성 순으로 나타났다. 본 연구를 통하여 조경시공분야 신입사원들의 이직의도가 매우 높게 나타나서 인적자원관리가 필요함을 시사하였다.

할로카본의 산화 분해반응을 통한 VOCs 제거 연구

김도균,장원철,이태진 ( Do Gyeun Kim,Won Chul Chang,Tae Jin Lee ) 한국화학공학회 1996 화학공학의이론과응용 Vol.2 No.2