[논문]실험시설 기초의 진동사용성 분석

최형석,전법규,김남식,정진환 釜山大學校生産技術硏究所 2007 生産技術硏究所論文集 Vol.66 No.-

건물에 작용하는 진동하중은 구조물 자체의 성능에 영향을 미칠 뿐만 아니라 거주하는 사람이나 작업기계 동에 나쁜 영향을 가져올 수 있다. 본 연구에서는 이러한 진동에 대한 영향을 평가하는 국내외의 기준에 대하여 고찰하고 다양한 하중과 주파수 대역에서 실험이 가능한 대형지진모사 실험센터에 대한 진동영향 평가를 수행하여 사용성 저하 여부를 확인하였다.

전치부 개교합을 가진 골격성 제 Ⅲ급 부정교합 환자에 있어서 하악지 시상분할 골절단술후 술후 안정성에 관한 평가

임재석,권종진,장현석,손형민,남영원,최철민 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.6

The purpose of this study is to assess the postoperative stability and the tendency of relapse after both sagittal split ramus osteotomy in skeletal class III with anterior open bite. This retrospective study was based on the examination of 15 patients, 6 males and 9 females, with a mean age 23.1 years. The patients were divided into two groups based on the amount of preoperative overbite(group I:<1mm, group II:≥1mm). Serial lateral cephalometric radiographs were taken within 2 weeks preoperatively, within 1 week postoperatively and at a follow up period that ranged from 7 to 24 months postoperatively. All cephalometric radiographs were traced and digitized using the Quick ceph image Pro for analysis. And then, horizontal and vertical changes of reference points(B point, Pogonion, L1) were assessed by the linear measurements in millimeters on both axes. The results were as follows : 1 Mean horizontal relapses were 0.67±0.93mm (11%) at B point (P<.05) and 0.81±1.01mm (13.2 %) at Pogonion (P<.01). 2, Mean vertical relapses were 0.63±1.62mm (33.3%) at B point and 0.53±1.95mm (31.4%) at Pogonion (P>.05) 3. The mean angular change of occlusal plane to SN was 0.24±1.19 (P>.05) and that of mandibular plane to SN was 1.03±1.85 (P<.05). 4. There was correlation between the extent of preoperative overbite and the postsurgical relapse at B point and Pogonion. 5. There was no correlation between the amount of surgically produced horizontal movement and the postoperative horizontal relapse at B point.

하악구치부 유리단결손의 임플란트 수복에 관한 임상적 연구

손형민,오화선,임재석 고려대학교 임프란트 연구소 2000 임프란트연구지 Vol.2 No.1

Many long-term study have demonstrated the successful use of osseointegrated implants to replace posterior teeth in the partially dentate patients. Implant were recently selected as the treatment of the choice for this population, instead of the previous resolves for the shortened dental arch (removable partial dentures, single or multiple cantilevers, or continued premolar occlusion). Advantages of patients with implant-supported prosthesis included an improved masticatory apparatus, reduced stress on the remaining anterior segments of the dentition, esthetics, comfort, and psychological benefits etc. But, there are many obstacle to implant placement in posterior mandible. The shape, quantity, and quality of bone in the mandible as anatomicla limitation and heavy occlusal force as mechanical disadvantage are significant factors in deciding which implant options possible. Consideration of these factors is necessary for the successful diagnosis and implant treatment of partially edentulous arches. PURPOSE : The purpose of this retrospective longitudinal study is to evaluate the long-term outcome, determinants of outcome, and the type and prevalance of prosthetic complications in the series of the patients treated with implants in the partially edentulous posterior mandible. MATERIAL AND METHODS : A total of 107 consecutively placed implants were inserted in 38 partially edentulous patients and restored with single-tooth and fixed partial dentures restoration at Korea University Guro-hospital from April 1991 to December 1999. The patients ranged in age from 22 to 72 years, and 54% were female. We analysed statistically long-term outcome according to type. RESULTS : The results were as follows : 1. The overall outcome showed an implant success rate of 97.2% in posterior partially edentulous mandible 2. In the proportion of the fixture length ; 10mm (22.4%), 11.5-12.0mm (19.6%), 13.0mm (19.6%) fixture were respectively predominant in order. In the proportion of the fixture width ; 3.75mm (47.7%), 5.0mm (36.4%) were predominant in order. 3. According to surface types of fixture, success rate were pure titanium 95.9%, TPS coating 100%, HA coating 100%. 4. A total of the 107 implants showed 20 complications (18.7%) the most common complications (7cases) was loosening of the abutment screw and gold screw. 5. Prosthetic complications with regard to fixture number showed higher prevalence one implant (30%) two implant (12.9%), three implant (11.1%) in order. 6. According to the prosthetic type, complications of screw type were 10 cases and cementation type were 4 cases. CONCLUSION : This study offers efficacious results of implant supported fixed prostheses as an alternative to traditional prostheses in patients with posterior partial edentulism. Therefore, we think that implant prosthesis is a relatively safe and predictable method for restoring partially posterior edentulous areas.

Cone beam형 전산화단층영상을 이용한 하악과두 위치의 연구

황형주,김규태,최용석,황의환 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.2

Purpose : To evaluate position of the mandibular condyle within articular fossa in an asymptomatic population radiographically by a cone beam computed tomography. Materials and Methods : Cone beam computed tomography of 60 temporomandibular joints was performed on 15 males and 15 females with no history of any temporomandibular disorders, or any other orthodontic or prosthodontic treatments. Position of mandibular condyle within articular fossa at centric occlusion was evaluated. A statistical evaluation was done using a SPSS. Results : In the sagittal views, mandibular condyle within articular fossa was posteriorly located at medial and central sections. In the coronal views, mandibular condyle within articular fossa was laterally located at central section. Mandibular condyles in the right and left sides were showed asymmetric positional relationship at medial, central, and lateral sections. Conclusion : Mandibular condyle within articular fossa in an asymptomatic population was observed nonconcentric position in the sagittal and coronal views.

Quaternary Ammonium Salt Cephalosporin계 抗生劑 合成

高捧奭,高玉鉉,姜馨龍 조선대학교 약학연구소 1995 藥學硏究誌 Vol.17 No.1

For the development of quaternary ammonium salt cephalosporin antibiotics with improved antimicrobial activities, a series of 7β-[(Z)-2-(2-aminothiazol-4-yl)-2-(methox yimi no) acetamido]-3-[4-alkyl (or aryl)-3- thiosemicarbazid-1- nicotinonium] methyl -3- cephem -4- carboxylate were synthesized. Antimicrobial activities of these new compounds were examined against Gram(+) and Gram(-)bacteria. It was found that the moiety synthesized cephalosporin derivatives were good antibacterial activities against Escherichia coli. Almost these compounds were more antibacterial activities than cefazoline. These new compounds showed lower activity than cefotaxime against Pseudomonas aeruginosa.

효소 전처리 BCTMP 시트의 노화 거동

양봉숙,김형진,강규영,조병묵,오정수 동국대학교 생명자원과학대학 연습림 2000 연습림논문집 Vol.- No.6

It was generally known that the aging treatment of paper is accompanied with the reductions in physical and optical properties of individual fibers and sheet. In particular, the paper prepared with mechanical pulps occurs the yellowing of sheet, during aging, due to the absorption of light or temperature, and finally has limitation in widely applicable functions of paper. The aging behaviors of paper can be discussed with three groups of factor. One is considered to external factors, like heat, light and moisture. Another is commented with environmental factors, like oxygen, nitrogen, sulfur, and other air pollutant materials. The other is explained by internal factors, like pulp types, lignin contents, and so on. In this paper, the aging behaviors of paper prepared with BCTMP were studied in order to know how to affect in physical and optical properties of paper. For modification of fibers properties, a commercial enzyme was pretreated in the slurry of BCTMP, before handsheet-making. Sheets were aged by accelerated heat treatment. The comparisons were carried out in mechanical strength properties and color reversions. Aging treatments were resulted in higher brightness reductions, in enzyme pretreated paper.

전자상거래소비자보호법상 전자상거래와 통신판매와의 관계에 관한 연구

고형석 法務部 商事法務課 2009 선진상사법률연구 Vol.- No.47

급증하는 전자상거래로 인한 소비자피해를 예방하기 위하여 전자상거래 소비자보호법은 2002년에 제정되었다. 동법의 규율대상인 거래형태는 전자상거래와 통신판매이며, 양자에 대하여 동법 정의규정에서 명백하게 구분하고 있다. 그러나 동법의 구체적인 내용면에 있어서는 양자를 함께 규율하거나 양자 중 하나만을 규율하고 있다. 특히, 동법의 핵심적인 내용인 제13조 내지 제20조에 대하여는 통신판매만을 대상으로 하고 있기에 과연 전자상거래분야에도 이러한 제규정이 적용될 수 있는가의 문제점이 제기되고 있다. 이러한 점은 통신수단을 통하여 이루어지는 격지계약이라는 점을 가지고 규율하는 외국의 입법례와 달리 양자를 먼저 구분하면서도 전자상거래가 통신판매의 일종에 해당한다는 전제하에서 입법을 하였기에 발생한 문제이다. 이에 학설은 전자상거래가 통신판매의 일종이라고 긍정하는 견해와 이를 부정하는 견해로 구분되고 있지만, 긍정하는 견해에서도 이를 명확하게 하기 위하여 법개정이 필요하다고 한다. 그러나 동법의 정의규정상 양자는 명백히 구분되며, 전자상거래에 대하여는 전자문서만의 사용을 요구하고 있을 뿐 어느 단계에서 사용되어야 하는가에 대하여는 규정하고 있지 않아 매우 광범위한 전자상거래가 인정되고 있다. 반면에 통신판매는 통신수단을 이용하여 양당사자가 비대면하여 계약을 체결하는 것 뿐만 아니라 사전에 정보제공이 존재할 것을 요구하고 있다. 따라서 전자상거래와 통신판매는 일치하는 거래형태가 아니며, 전자상거래의 일부가 통신판매에 해당할 뿐이다. 또한 사이버몰을 통한 거래에 대하여는 대부분의 견해가 전자상거래이자 통신판매에 해당한다고 하고 있으나, 통신판매에서의 사전정보제공은 적극적 정보제공을 의미하며, 사이버몰에서의 정보게시는 일반 상점에서의 상품의 진열에 해당하는 소극적 정보제공에 해당한다. 따라서 적극적 사전정보제공이 없는 상태에서 이루어진 사이버몰의 거래는 전자상거래에는 해당하지만, 통신판매에는 해당하지 않는다. 그러나 동법 제13조 내지 제20조에서 전자상거래를 규정하고 있지 않지만, 사법의 경우 유추해석이 인정되기 때문에 유추해석을 통하여 이에 관한 규정을 전자상거래에도 적용할 수 있다. 그러나 동 규정의 위반시 공법적 규제가 수반되며, 이 경우에는 엄격해석이 요구되기 때문에 전자상거래만을 행하는 전자상거래업자가 이를 위반하였다고 하였을 경우 공법적 규제는 불가능하다. 그 결과 공·사법적인 규제를 통하여 동법의 입법목적을 달성하고자 하는 의도는 사실상 불가능해지기 때문에 관련규정의 개정이 요구된다. Act on the Consumer Protection in the Electronic Commerce Transactions was enacted to protect consumers using electronic commerce in 2002. But the Act regulates not only electronic commerce but also mail-order sales and classifies both parties obviously. The issue whether those provisions applied in electronic commerce is raised because important provisions of the Act(§13-§24) are applied in only mail-order sales. Theories are divided between support judgments and object view. Considering the contents of definition provision about mail-order sales, electronic commerce is not entirely corresponded with mail-order sales. In particular, transactions in cyber-mall and mail-order sales do not correspond entirely. As a result, important provisions of the Act could be not applied to electronic commerce that doesn't conform to mail-order sales. But those provisions would be applied to electronic commerce by means of analogical interpretation. Even if it were so, it is raising doubts whether the legislative purpose of the Act, protecting consumer using electronic commerce, could be achieved by only civil provisions because public punishment against violation of the Act could not be imposed. Therefore, not to raise a problem, it is necessary for legislative solution.

공업화부재의 생산/운반/양중관리를 위한 정보가시화 시스템 개발에 관한 연구

임형철,송영석,김창덕,송성진 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

Recently, The construction field in the urban area is short of working space and securing processing place because it is surrounded by adjacent buildings and nearby roads and have difficulties in rising labor costs. The insufficient space causes problems of interference and conflicts in transporting materials and working at the site. Therefore, Construction Manager find many alternative method and select industrialized method. The objective of this paper is to develop and give a method of information visualization system for manufacturing, delivering and lifting these materials in construction project stakeholders, using tools visualizing informations. The tools supports to stakeholders so many informations in material manufacturing, delivering, lifting in construction site. That is, order information, manufacture information in factory, sending information, carrying information, unloading and lifting in Site, and so on. Case studies are performed to evaluate the feasibility and applicability of the proposed method.

비행체 탑재 빔 조향 안테나

함형석,문상만,우종명 충남대학교 산업기술연구소 2005 산업기술연구논문집 Vol.20 No.1

This paper presents the Beam steering antenna on aircraft. An proposed and advanced printed type monopole antenna which overcomes drawbacks of conventional monopole antennas. On the front part, it has parasitic elements as a reflector to increase directivity gain in one direction. The Beam Steering antenna proposed in this paper has pin diode attached between two parasitic elements and ground, enabling control of beam directivity by the diode switch. The proposed antenna on aircraft shows the characteristics of the back directivity antenna with the gain of 1.5dBd and F.B. ratio 8.8dB, which leads us to conclude that the antenna has advantages in improving the gain and F.B. ratio.

한국인에게서 그레이브스병 약물치료의 적정기간

이형숙,이동훈,정희선,이종우,김정은,신승수,정윤석,이관우,김현만 대한내분비학회 2003 Endocrinology and metabolism Vol.18 No.1

연구배경: 그레이브스병의 치료에는 항갑상선제, 수술 및 방사성 요오드법이 선택되어 사용되고 있다. 이중 항갑상선제는 가장 많이 선호되고 있으나 낮은 관해율과 높은 재발율로 장기간 치료기간이 요구된다. 저자들은 그레이브스병 환자에게서, 선택되는 치료법의 선호도와 각 치료법의 관해율을 조사하고자 본 연구를 시행하였다. 또한 본 연구에서는 항갑선제 치료의 적정기간을 평가하고자 하였다. 방법: 아주대학교병원에 내원한 환자 중 1년 이상 추적관찰이 가능한 205명의 그레이브스병 환자를 대상으로 조사하였다. 항갑상제군, 수술군 및 방사성 요오드군은 각각 170명, 29명 그리고 6명이었다. ROC curve를 이용하여 약물치료의 예후예측인자를 분석하였다. 결과: 1) 그레이브스병 환자의 치료 방법의 선택은 항갑상선제군, 수술군 및 방사성 요오드군 각각 170명(83.0%), 29명(14.1%) 그리고 6명(2.9%)으로 항갑상선제 치료가 가장 선호되었다. 2) 그레이브스병의 관해율은 항갑상선제군, 수술군 및 방사성 요오드군에서 각각 60.0%(102/170명), 96.5%(28/29명) 그리고 83.0%(5/6명)으로 수술군이 가장 높았다. 3) ROC curve의 AUC는 치료기간과 진단시 TBII가 각각 0.709 및 0.648이었고 적절한 약물투여 추적 관찰기간은 26개월이었다. 결론: 그레이브스병의 일차 치료법으로는 항갑상선제가 선호되고 있으나 수술 및 방사성 요오드 치료군에 비해 상대적으로 낮은 관해율을 보였다. 따라서 항갑상선제 치료로 26개월 이상 관해가 되지 않을 경우에는 치료 방법의 변경을 고려하는 것이 관해율을 높이는데 도움이 될 것으로 생각된다. Background: Graves' disease in an organ specific autoimmune disease. Three kinds of therapeutic modalities (antithyroid drugs, ablation with radioactive iodine and subtotal thyroidectomy) are frequently performed for the management of this disease. The most popular therapeutic policy for the disease in Korea is antithyroid treatment. We analysed and compared the remission rates of all three modalities for Graves' disease, and evaluated the antithyroid modality to determine the correct duration of treatment. Subjects & Methods : The medical records of 205 patients with Graves' disease were reviewed. For the evaluation of the antithyroid modality medical treatment, antithyroid drugs were administered for more than 1 year. The prognostic factors associated with remission were analysed by means of an ROC curve. Results: 1) Of the 205 patients, proportions that received medical therapy, subtotal thyroidectomy and radioiodine therapy were 83.0, 14.1 and 2.9%, respectively. 2) The remission rates of the medical therapy, surgery and radioiodine therapy were 60.0, 96.5 and 83.0%, respectively. 3) The remission rate of the medical therapy was associated with the duration of medication and TBII activity. The determined proper duration for the antithyroid treatment was 26 months from the ROC curve analysis. Conclusion: The above results suggest that the proper duration of antithyroid treatment for Graves' disease is 26 months, after which time the subtotal thyroidectomy or radioiodine therapy should be considered if the disease has not remitted (J Kor Soc Endocrinol 18:24∼31, 2003).