Nafion-ethylenediamine이 수식된 유리탄소전극에 의한 시차펄스전압전류법으로 철(II) 이온의 정량

김경원,김희철,김성현,박병호,김연희,김경남,고영춘,Kyong Wone Kim,Hee Cheol Kim,Sung-Hyun Kim,Byung Ho Park,Yeon Hee Kim,Kyong Nam Kim,Yong Chun Ko 대한화학회 2003 대한화학회지 Vol.47 No.2

Determination of iron(II) ion with a perfluorinated sulfonated polymer(nafion)-ethylenediamine(en) modified glassy carbon electrode was studied. It was based on the chemical reactivity of an immobilized layer(nafion-en) to yield complex $[Fe(en)_3]^{+2}$. The oxidation peak potential by differential pulse voltammetry(DPV) was observed at 0.340${\pm}$0.015 V(vs. Ag/AgCl). The linear calibration curve was obtained in iron(II) ion concentration range $5{\times}10^{-6}{\sim}0.2{\times}10^{-3} M(0.28{\sim}11.17\; mg/L)$, and the detection limit(3s) was $1.89{\times}10^{-5}$M(1.056 mg/L). Perfluorinated sulfonated polymer(Nafion)-ethylenediamine(en)이 화학수식된 유리탄소전극으로 Fe(II) 이온의 정량에 대해 연구하였다. Fe(II) 이온의 착화제인 en을 nafion에 고정시켜 유리탄소전극 표면에 수식하면 이 수식전극의 en은 Fe(II) 이온과 $[Fe(en)_3]^{+2}$의 착물을 형성한다. Nafion-en이 화학수식된 유리탄소전극에서 시차펄스전압전류법에 의한 Fe(II) 이온의 산화봉우리전위는 0.340${\pm}$0.015 V(vs. Ag/AgCl), 측정범위는 $5{\times}10^{-6}{\sim}0.2{\times}10^{-3} M(0.28{\sim}11.17 mg/L)$, 검출한계(3s)는 $1.89{\times}10^{-5}$M(1.056 mg/L)이었다.

인공위성 전개장치용 테잎힌지 특성 해석

김경원,임재혁,김창호,김선원,김성훈,Kim, Gyeong-Won,Im, Jae-Hyeok,Kim, Chang-Ho,Kim, Seon-Won,Kim, Seong-Hun 한국천문학회 2012 天文學會報 Vol.37 No.2

본 논문에서는 인공위성 전개장치용 테잎힌지 특성해석을 수행하고 그 결과에 대하여 분석하였다. 테잎힌지를 이용한 전개장치는 신뢰성이 높고, 형상이 매우 단순하며, 제작단가 또한 저렴하여 우주용 안테나 및 태양전지판에 널리 이용이 되고 있다. 테잎힌지를 이용한 전개장치의 전개특성은 테잎힌지 특성에 의하여 좌우가 되므로 안전성 있는 전개장치 설계를 수행하기 위해서는 가능한 정확한 해석이나 계산이 요구되어진다. 초기에는 쉘 이론등을 바탕으로 테잎힌지의 전개특성을 계산하는 식들이 연구되었으나 테잎힌지의 강한 비선형성 때문에 정확성이 많이 떨어지는 큰 단점이 존재하였다. 이후 많은 연구를 통하여 유한요소모델을 이용한 비선형해석을 통하여 비로소 정확한 전개특성을 해석할 수 있게 되었다. 본 논문에서는 다물체 동역학해석프로그램인 리커다인의 유연체 해석모듈을 이용하여 테잎힌지에 대한 특성해석을 수행하였다. 해석결과 신뢰성 있는 테잎힌지의 전개거동 확인 및 전개특성을 계산할 수 있었다.

하악지 분쇄자가골과 이종골을 이용한 상악동 골이식술

김경원,이은영,Kim, Kyoung-Won,Lee, Eun-Young 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.3

저자들은 상악골 구치부에서 잔존 치조골의 흡수 및 상악동의 함기화로 인하여 통상적인 임플란트 시술이 어려운 증례에서 하악골의 하악지에서 자가골을 채취하여 이를 분쇄한 후 이종골과 부피비로 약1:1로 혼합하여 상악동 골이식술을 시행하고 동시에 임플란트를 식립하여 비교적 만족할만한 결과를 얻었기에 이를 문헌고찰과 함께 보고하며, 향후 이러한 증례들과 다른 골이식재를 사용한 증례들에 대하여 보다 장기적인 추적조사와 골이식된 부위의 골조직의 재형성, 식립된 임프란트의 보철적인 기능과 장기적인 예후에 대한 보다 체계적인 연구가 필요하리라 사료된다. The maxillary sinus bone graft procedure is one of the predictable and successful treatments for the rehabilitation of atrophic and pneumatized edentulous posterior maxilla. Materials used for maxillary sinus floor augmentation include autogenous bone, allogenic bone, xenogenic bone and alloplastic materials. Among them, autogenous bone grafts still represents 'gold standard'for bone augmentation procedures. We selected the mandibular ramus area as a donor site for the autogenous bone graft because of low donor site morbidity. We performed maxillary sinus bone graft procedures with implant placement using particulated ramal autobone and bovine bone mixture, and got good results. This is a preliminary report of the maxillary sinus bone graft using particulated ramal autobone and bovine bone, requires more long-term follow up and further studies.

Preparation and Analysis of Schottky Diodes with Au and Sol-gel-processed ZnO Thin Films

김경원,Yong-Won Song,Jaehyeon Leem,Sangsig Kim,Sang Yeol Lee 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1

We fabricate Schottky diodes with the contact between a sol-gel derived ZnO layer and Au that guarantees the expected Schottky contact due to the high work function. The formed single metal Schottky barrier shows characteristics comparable to the barrier formed by alloys. Au is deposited by thermal evaporation on a ZnO thin film that is optimally formed under sol-gel process conditions of a 1-mol zinc acetate concentration and a 3000-rpm coating speed. Possible defects, which can provide deleterious current paths, are minimized by patterning the deposited Au. The I−V curve verifies the formation of a Schottky contact. Measurements showed that the Schottky barrier height and leakage current at −5 V were 0.6 eV and 1 × 10−12A, respectively.

한국 과학기술 연구경쟁력 현주소

김경원,Kim, Gyeong-Won 한국과학기술단체총연합회 2007 과학과 기술 Vol.40 No.2

테잎 스프링 힌지를 이용한 대용량 인공위성 태양전지판 전개해석

김경원,김선원(Sun-Won Kim),전형열(Hyoung-Yoll Jun),황도순(Do-Soon Hwang) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.10

임플란트 식립 수술시 하악지 자가골이식술의 임상적 활용

김경원,이은영,Kim, Kyoung-Won,Lee, Eun-Young 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.3

저자들은 잔존 치조골의 흡수 및 위축으로 통상적인 임플란트 시술이 어려운 증례에서 하악골의 하악지에서 자가골을 채취하여 이를 증례에 따라 블록형 혹은 입자형으로 골 이식술을 시행하여 다양한 증례에 적용하여 비교적 만족할 만한 임플란트 식립 수술이 가능하였던 바 이를 문헌고찰과 함께 보고하며, 본 연구에서는 다양한 술식의 임상적 활용에 대해서만 보고하였으나 향후 이러한 증례들에 대하여 보다 장기적인 추적조사와 골 이식된 부위의 골 조직의 재형성 식립된 임프란트의 보철적인 기능과 장기적인 예후에 대한보다 체계적인 연구가 필요하리라 사료된다. Dental endosseous implants require sufficient alveolar bone volume and quality for complete bone coverage and initial stability. But, atrophy or resorption of alveolar bone height and width according to patient's age and period of tooth loss can prevent ideal implant placement. Bone graft procedure has been proposed before or simultaneously with the placement of dental implants in patients with insufficient alveolar bone volume. While allografts, xenografts, and alloplastic bone grafts have been proposed and studied for alveolar ridge augmentation, the use of autogenous bone grafts represents the 'gold standard' for bone augmentation procedures. Conventional bone grafts are usually harvested from distant sites such as the ilium or ribs. Recently there is a growing use of intraoral bone grafts from intraoral donor sites such as mandibular symphysis, mandibular ramus and maxillary tuberosity. We recommend that the mandibular ramus is a safe autogenous bone graft donor site for bone harvesting with low morbidity. We report various effective autogenous bone graft procedures from mandibular ramus for the implant placement on various atrophic alveolar ridges.

화장품 패키징 동향

김경원,Kim, Gyeong-Won (사)한국포장협회 2015 包裝界 Vol.266 No.-

대전 일부지역 대학생의 패스트푸드 이용 및 이와 관련된 요인

김경원,안윤,김형미,Kim, Kyung-Won,Ahn, Yun,Kim, Hyung-Mee 대한지역사회영양학회 2004 대한지역사회영양학회지 Vol.9 No.1

The study purpose was to investigate the factors related to fast food consumption of university students. Factors were identified using the Theory of Planned Behavior. Based on the pilot study, 18 behavioral beliefs, 7 normative beliefs and 19 control beliefs were identified. Data (n = 269) were analyzed using analysis of variance or $X^2$, tests. Subjects were categorized into non-users (27.9%), users (42%) and frequent users ( $\geq$ 2 times/week, 30.1%). Regarding behavioral beliefs, users or frequent users responded more positively on advantages of eating fast foods including ‘taste’ (p < 0.001), ‘making me feel full’(p < 0.001), ‘diverse menus’(p < 0.05) than non-users. Compared to users, non-users responded more positively on the item that eating fast foods leads to eat vegetables less (p < 0.05), and negatively on ‘making me eat more salt’(p < 0.05). Most of the referent groups, parents (p < 0.001), sisters/brothers (p < 0.01), relatives (p < 0.01), friends (p < 0.05), boy/girl friends (p < 0.05) were important sources of influence regarding subjects' fast food consumption. Users or frequent users felt less control over factors or situations that make it consume fast foods (9 out of 19 control beliefs). These factors included; availability issues (p < 0.001), ‘not having other foods on hand’(p < 0.01), ‘others eating together like fast foods’, ‘convenience’, ‘social increase in fast food use’, ‘easy to get fast foods anytime’(p < 0.05). In addition, users of fast foods were more likely to eat fast foods when they don't have time, when they do not like to cook, when they feel hungry (p < 0.05). These results suggest that interventions for university students include strategies to moderate fast food use by modifying behavioral beliefs, suggesting alternative menus and behavior modification techniques, increasing perception of control, and eliciting social support.

A new record of the species Sinocorophium dongtanense (Crustacea: Amphipoda: Corophiidae) from Korean waters, with comparison to Sinocorophium homoceratum

김경원,Jun-Haeng Heo,Young Hyo Kim 국립생물자원관 2023 Journal of species research Vol.12 No.4

A newly recorded species, Sinocorophium dongtanense, of the genus Sinocorophium was collected from shallow waters of Korea. This species was previously reported as S. homoceratum in Korea. However, after reanalysis of previously studied samples, this species was identified as S. dongtanense, which had previously been reported from the Yangtze estuary, Shanghai, China in 2014. In this study, the newly recorded species is illustrated with a diagnosis and compared to the previously misidentified species. Molecular phylogenetic studies for Sinocorophium species in Korea are provided. A key to the Sinocorophium species in Korea is also provided.