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.

상악동 골이식술과 하악지 자가골 블록을 이용한 상악 구치부 치조제 수직증강술

김경원,이은영,Kim, Kyoung-Won,Lee, Eun-Young 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.3

The maxillary posterior area is the most challenging site for the dental implant. After missing of teeth on maxillary posterior area due to periodontal problems, the remaining alveolar ridge is usually very thin because of not only pneumatization of maxillary sinus but also destruction of alveolar bone. The maxillary sinus bone graft procedure is one of the most predictable and successful treatments for the rehabilitation of atrophic and pneumatized endentulous posterior maxilla. But, in case of severe destruction of alveolar bone due to periodontal problems, very long crown length is still remaining problem after successful sinus graft procedures. We performed vertical augmentation of maxillary posterior alveolar ridge using mandibular ramal block bone graft with simultaneous sinus graft. After this procedures, we could get more favorable crown-implant ratio of final prosthodontic appliance and more satisfactory results on biomechanics. This is a preliminary report of the vertical augmentation of maxillary posterior alveolar ridge using mandibular ramal block bone graft with simultaneous sinus graft, so requires more long-term follow up and further studies.

연구발표논문초록 ( 생물공학 (Ⅰ) ) : 3상 실관 생화학 반응기의 이론적인 해석

김경원,장호남 (정) ( Gyeong Won Kim,Ho Nam Chang ) 한국화학공학회 1984 춘계총회초록집 Vol.- No.-

Comparison of Allergic Indices in Monosensitized and Polysensitized Patients with Childhood Asthma

김경원,Eun Ah Kim,Byoung Chul Kwon,Eun Soo Kim,송태원,손명현,김규언 대한의학회 2006 Journal of Korean medical science Vol.21 No.6

Monosensitization differs both immunologically and clinically from polysensitization, and specific immunotherapy is more effective in patients sensitized only to a single pollen than in multiple-pollen sensitized patients. To further examine the differences between monosensitized and polysensitized allergies, allergic indices were examined in 68 monosensitized and 62 polysensitized patients with childhood asthma. Measurements included symptom scores, eosinophil counts, skin prick tests, serum total and specific IgE levels, and IL-10 levels, and were used to compare allergic indices between the two groups. Patients were followed for 18 months following immunotherapy to examine the effectiveness of the treatment. Symptom scores and total IgE levels were significantly higher in the polysensitized group than those in the monosensitized group (p<0.05). The levels of skin test response decreased significantly in both groups following immunotherapy. In the monosensitized group, symptom scores and specific IgE levels were significantly reduced after immunotherapy (p<0.05). In the polysensitized group, symptom scores were reduced after immunotherapy (p<0.05), but the degree of reduction was less than that of the monosensitized group (p<0.05). Moreover, in the polysensitized group, specific IgE levels after immunotherapy did not differ from that before immunotherapy. Serum IL-10 levels were not significantly increased after immunotherapy in either group. In conclusion, polysensitized patients tend to show higher allergic indices and immunotherapy might be less effective for these patients.

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.

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.

다양한 구강내 결손부 재건을 위한 비순피판의 활용

김경원,이은영,Kim, Kyoung-Won,Lee, Eun-Young 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.1

The nasolabial flap has been used for reconstruction of moderate size intraoral defects. The nasolabial fold area provides an ample supply of tissue with a good color and texture match. The nasolabial flap classified advancement flap, inferiorly-based flap, superiorly-based flap. The flap is based inferiorly, so that it can easily be rotated to the intraoral defects. The nasolabial flap is chosen for the repair of various intraoral defects because of its simple elevation, proximity to the defect and its rich subcutaneous blood supply of a island flap. The subjects were 6 patients with nasolabial flap, who had reconstruction of moderate size intraoral defects. We have found the inferiorly-based nasolabial flap with a subcutaneous pedicle useful in the primary repair of surgical defects of the buccal mucosa, edentulous mandibular ridge, maxillary alveolus area and soft palate in these patients. There was no complication except one case. Intraoral hair growth was a minor problem of this patient. We thought that the inferiorly-based nasolabial flap is a useful technique for reconstruction of various intraoral defects.

완전 골성 양측성 후비공 폐쇄 환자의 구개부를 통한 외과적 치험례

김경원,조용석,양수남,Kim, Kyoung-Won,Cho, Yong-Seok,Yang, Soo-Nam 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.2

23세의 건강한 산모에게서 정상 분만되고, 출생시 체중 3.lkg의 여자 아이가 출생 직후 청색증, 호홉 곤란 등의 소견을 보이나, 육안적으로 관찰되는 불완전 양측성 구순열 이외에는 특별한 두개안면 이형증 등의 소견은 관찰되지 않아서, 소아과 담당의사가 전비공을 통하여 비인두강 내의 분비물 등의 이물질 홉인을 시도하려다 작은 고무 도관의 삽입이 이루어지지 않아서 후비공 폐쇄를 의심하였다. 경구 호홉관을 이용하여 기도 확보 후에 후비공 폐쇄 여부의 진단을 위해서, 비강내 방사선 비투과성 물질의 접적 주입한 후에 방사선 사진, 컴퓨터 단층 촬영 등을 통하여 완전 골성 양측성 후비공 폐쇄를 확진하였다. 양측성 후비공 폐쇄는 출생시 주기적인 호홉 곤란의 증상을 보이며, 특히 포유시에 호홉 곤란의 증상이 악화되어서 신생아의 생명을 위협하는 응급 상황으로 이에 대한 외과적인 처치를 시행하기로 결정하였다. 후비공 폐쇄에 대한 외과적인 처치는 비강을 통한 접큰법, 구개부를 통한 접근법, 비중격을 통한 접근법 등의 여러 가지 접근법이 있으나, 본 환자의 경우는 완전 골성 양측성 후비공 폐쇄로 확진이 되었고, 이에 대한 저자들의 경험이 전혀 없는 상태이었기에 보다 좋은 수술 시야를 용이하게 확보할 수 있으며, 새로이 형성해준 후비공을 따라 점막 피판을 보존해 줄 수 있고, 수술 후 후비공의 개통성을 보다 확실하게 얻을 수 있을 것으로 예상되는 구개부를 통한 접근법을 이용하여 외과적인 처치를 시행하였다. 수술 후 약 1 년이 경과하였으나 임상적으로 호홉 곤란 등의 특별한 문제점이 없이 만족할 만한 경과를 보였다. 일반적인 교과서에서 설명하듯이 기성품으로 제작된 자가보전 견인자의 설압자는 이와 같은 신생아의 증례에서는 크기가 상대적으로 너무 커서 사용이 곤란하였다는 점을 염두에 두어야 할 것으로 생각되며, 추후 유사한 증례의 수술시에 도움을 주고자 매우 희귀한 증례인 완전 골성 양측성 후비공 폐쇄 환자에 대한 치험례를 문헌 고찰과 함께 보고하는 바이다. Choanal atresia may be membrane or bony, unilateral or bilateral. Approximately 90% of the choanal atresia are bony type. Unilateral choanal atresia often eludes the diagnosis because of the absence of subjective symptoms in the neonatal period. However, bilateral choanal atresia presents at birth with cyclic respiratory distress aggravated by feedings. So complete bilateral choanal atresia is considered as a neonatal emergency. Examinations for the diagnosis of chonal atresia include 1) attempt at passing a rubber catheter or probe through the patient s nose, 2) mirror examination of the nasopharynx, 3) digital examination of the nasopharynx, 4) X-ray examination after installation of radiopaque materal into the nasal cavity. But, computed tomography has become accepted method for evaluation of choanal atresia. Surgical repair of choanal atresia is accomplished via transnasal or transpalatal approach. Advantages of the transpalatal approach are improved exposure and the preservation of mucosal flap along the newly formed apertures. On the other hand, the transpalatal approach carries the risk of injury to the greater palatine neurovascular complex, and requires longer operative time. After careful physical and radiographic examinations, we accomplished the surgical repair of the complete bony bilateral choanal atresia via transpalatal approach without complications.

연구발표논문초록 ( 생물공학 (Ⅰ) ) : 3상 실관 생화학 반응기에서의 포도당 산화 반응

김경원,이창우,장호남 (정) ( Gyeong Won Kim,Chang Woo Lee,H . Nam Chang ) 한국화학공학회 1984 추계총회초록집 Vol.- No.-