사망진단서(사체검안서) 상의 선행사인으로부터 사망통계의 원사인이 선정되는 비율 : 3개 대학병원에서 교부된 사망진단서를 중심으로

박우성,박석건,정철원,김우철,탁우택,김부연,서순원,김광환,서진숙,부유경 한국의료QA학회 2004 한국의료질향상학회지 Vol.11 No.1

Background : To exatnine the problems intolved in writing practice of death certificates, we cotnpated the determination of underlying cause of death for wital statistics using recorded underlying cause of death in issued death statistics. Methods : We collected 688 rnortality certificates issue in year of 2,000 from 3 university hospitals. And we also collected vital statistics from ministry of statistics. The causes of death were coded by experienced medical record wpecialists. And causes of death determined at ministry of statistics for national vita statistics were mapped to causes of death recorded at each death certificates. The rate that underlying causes of death for vital statistics were derived from underlying causes of death recorded at issued death certificaties sere analysed. Results : 64.5% of underlying cause of death for could be derived from underlying cause of death recorded at issued death certificates, 8.6% derived from intermediate cause of death, and 3.9% derived from direct cause of death. In 23% of cases, underlying cause of death could not be derived using issued death certificates. The rate that underlying cause of death for vital statistics could be derived from underlying cause of death recorded at death certificates was different between 3 university hospitals. Ane the rate was also different between death certificates and postmortem certificates. We classified the causes of death using 21 major categories. The rate was different between diseases or conditions tha caused death too. Conclusion : When we examined the correctness of death certificate writing practice using abpve methods, cortectness of writing could not be told as satisfactory. There was difference in correctness of writing between hospotals, between death certificates and postmortem certificates, and between diseases and conditions that caused death. With this results, we suggested some strategy to improve the correctness of death certificate writing practice.

수용성 및 가식성 콩 단백질/�틴 블렌드 필름 제조 및 물성 연구

김성철,신용섭,정세환,유성구,박인식,김봉식,신부영 한국공업화학회 2003 응용화학 Vol.7 No.2

The manufacture of edible/biodegradable films or coatings can potentially add value to soy protein, Such films can find using as edible or nonedible food packaging materials. The effect of soy protein film-forming solutions on film formation, tensile properties of soy protein/pectin blend films were changed significantly by the amount of glycerol and the ratio of soy protein/pectin. Moreover mechanical properties of soy protein/pectin-montmorillonite clay have been studied. Tensile strength and modulus decreases as the relative humidity increased while with increasing relative humidity elongation at break increased.

레진접착제를 도포한 상아질에 대한 합착용 시멘트의 전단결합강도

김교철,우이형,이성복,최부병 慶熙大學校 齒科大學 1995 慶熙齒大論文集 Vol.17 No.2

The purpose of this study was to confirm the formation of hybrid layer and resin tags in dentin tissue and the possibility of bonding between luting cements used for the prosthesis and the resinous surface coated with resin bonding agents to prevent the dentin hypersensitivity after abutment preparation. Some resin bonding agents, which may have the possibility of bonding with polyacrylic acid as a liquid ingredient of polycarboxylate and glass ionomer cements, were selected. All-Bond desensitizer containing NTG-GMA and BPDM, Scotch-Bond Multipurpose plus containing HEMA, and XR-bond containing organophosphate were selected as a coating agent. Dental cements were zinc phosphate, polycarboxylate, and glass ionomer cement. After the exposed dentin surface of premolars was ethced with 10% phosphoric acid and coated with resin bonding agents, the morphology of treated surfaces and the resin tags and hybrid layers on sectioned surfaces were observed by SEM. Shear bond strength between the resin bonding agents and 3 kinds of cements was measured 24 hours after bonding. On the debonded surfaces of the shear bond strength tested specimens, the cement tags and the bonding sites between the resin materials and cements were examined by SEM. Following conclusions were drawn 1. Coating of dentin with resin bonding agents had no effect on the shear bond strength of zinc phosphate cement. 2. Both of polycarboxylate and glass ionomer cements showed the increased shear bond strength by the dentinal coating with Scotch-Bond Multipurpose plus containing HEMA. However, in the case of dentinal coating with some agents containing NTG-GMA and BPDM or organophosphate, polycarboxylate cement exhibited the lowered shear bond strength, and glass ionomer cement showed the unchanged shear bond strength. 3. Complete obstructions of dentinal tubules were observed on the dentin coated with All-Bond desensitizer or XR-bond, but distinct shape of the orifices of dentinal tubules was observed consistently on the dentin coated with Scotch-Bond Multipurpose plus. 4. The hybrid layer was thickest on the dentin coated with Al1'Bond desensitizer, and the length of resin tags was longest on the dentin coated with Scotch-Bond Multipurpose plus. 5. On the debonded specimens which had been bonded with polycarboxylate cement or glass ionomer cement after coating with Scotch-Bond Multipurpose plus, the cement tags and the bonding sites between the resinous surface and the cements could be examined.

오존酸化와 活性炭 濾過에 의한 飮料水의 水質改善에 관하여

李哲熙,金富漢 嶺南大學校 環境問題硏究所 1984 環境硏究 Vol.4 No.2

This research is conducted to find out the effect of ozonization in the removal of hazardous contaminants encountered at Sankyuk Waterworks, and also to modify the conventional treatment plant with ozonization process for producing the sterilized clean water. The ozone treatment rate to maintain 0.4mg/1 of free residual ozone in the gallery infiltered water is 2.1mg/1 for ozone demand flask, 1.8mg/1 for pilot plant. Accordig to increase of iron and manganese in the gallery infiltered water, the turbidity is encreased by ozonization. Through ozonization, sand filtration and activated carbon filtration, the water quality is improved by decreasing above 90% of the organic compounds detergent, algae,E.coli group, iron and manganese, but the ammonia is only removed 51%. As the amount of ammonia containing in the gallery infiltered water is 2.7mg/1, the filtered water through sands is required to aerate with air or to dose more amount of ozone before the activated carbon filtration in order to remove ammonia. When the sand filtration rate is 120m/day, the filter run time after ozonization in the gallery infiltered water is increased to 25% in comparison with the general rapid sand filtration.

한계 입력 내에서 단축 경로를 갖는 로봇 매니퓰레이터의 퍼지 강인 제어기의 설계

박재형,김승철,최부귀 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1

불확실한 모델과 외란을 가진 로봇 매니퓰레이터를 제어하기 위해, 비선형 강인 제어기가 적합하다. 본 논문에서는 불확실한 로못 매니퓰레이터의 제어에 강인 제어기를 적용할 때 발생하는 입력 토크의 포화를 해결하기 위한 알고리즘을 제안한다. 이 알고리즘은 퍼지 논리를 이용하여 초기의 경로를 바탕으로 새로 생성된 단축 경로를 생성하는 것이다. Robot manipulators are operated under model uncertaily, and their dynamics are highly nonlinear. To control them, nonlinear robust controllers are appropriate, but they need high torques so that actuators such as acuating motors can face torque saturation. In this paper, a new scheme is presented to achieve fast tracking in the presence of torque saturation. The scheme generates a new reduced path based onthe initial desired path using a fuzzy logic. Numerical examples are shown to validate the proposed controller using an uncertain two degree-of-freedom underwater robot manipulator.

퍼지 논리 보상기를 포함한 PID 제어기의 Deadzone 시스템 제어

박재형,김승철,최부귀 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1

Simple conventional control methods, such as PD and PID controllers are widely used in industrial applications. Such controllers exhibit poor performance when applied to systems containing nonlinearities arising from unknown deadzones. In this paper, we propose a novel fuzzy based precompensation approach for controlling systems with deadzones. The control structure consists of fuzzy logic based compensator followed by a conventional PID controller. Our proposed control scheme shows superior transient and steady-state performance compared to conventional PD and PID controller. In addition the scheme is robust to variations in deadzone nonlinearities as well as the steady-state gain of the plant. We illustrate the effectiveness of our scheme using computer simulation examples.

콩 단백질/펙틴/몬모릴로나이트 나노복합 필름의 특성 및 산소 투과도 연구

정세환,김성철,조규순,신용섭,장상희,홍기헌,이태진,신부영 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2

In this study, Mechanical property, thermal property, watervapor, and oxygen permeability of biodegradable Soy protein/Pectin-montmorillonite nanocomposite, prepared with Na^(+)-MMT, have been studied. X-ray diffraction and TEM experiments an polymer/silicate composite samples demonstrated that the intercalation of polymer chains leads to increase in the spacing between silicate layers. In addition, it were found that the intercalated Soy protein/Pectin/montmorillonite nanocomposite were prepared. It was found that the addition of only a small of clay was enough to improve the thermal stability and mechanical property of Soy protein/Pectin/montmorillonite nanocomposite. watervapor of Soy protein/Pectin/montmorillonite nanocomposite was generally lower than that of Soy protein/Pectin. oxygen permeability of Soy protein/Pectin/montmorillonite nanocomposite was generally lower than that of Soy protein/Pectin.

운동선수의 임장불안에 대한 연구

홍관이,이광재,김두경,부기원,노성규,한상준,박기동,오수일,문병용,이철규,박장평,엄기진,박남환 江原大學校附設 體育科學硏究所 1984 江原大學校附設體育科學硏究所論文集 Vol.- No.9

This study is designed to grasp the elements and situations of stage fright in order to propose a part of ways to cope with it. We make 511 top-class high school players, male and female, in the central districts (Seoul, Inchon, Kyungki, Chungbuk, and Kangweon Province) on object of questionnaire, and get the following results. Through players generally have all-round characters they show weakness in the superiority and emotional stability while showing strength in the sonformity. This fact comes to be related to the elements which cause stage fright. Physiological changes also have many effects on the symptom of stage fright. Especially, stage fright increases when players show sensitive reaction to the self-consciousness of final consequence which comes from the tension or uneasiness of sympathetic nerve, Thus, it turns out that players make use of reducing psychological burden by physical exercise or adjusting the level of demanded result in order to release the stage fright.

달팽이관내 기저막의 유한요소 모델링

강희용,양성모,김봉철,임재중,용부중 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1

Cochlea is well known to have the ability to analyze a wide frequency and this ability seems to be caused to the Basilar Membrane(BM) configuration. However, the relationship between the Cochlea frequency-position map is not clear. In this paper, the three-dimensional BM model was made using the Finite Element Method. Then, an attempt was made to examine the influence of the BM configuration on the Cochlea frequency-position map.

Al_2O_3를 첨가한 LaFeO_3 박막의 암모니아 가스감지 특성

이복상,조철형,최부천,박기철,마대영,김정규 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-

LaFeO_3 thin films with 2%, 5% and 10% A1_2O_3 additives were fabricated by r.f. magnetron sputtering method on Al_2O_3 substrates. Structural, electrical and ammonia gas sensing characteristics of the thin films with different heat treatments were examined. From the XRD results, the compound of LaFeO_3 and Al_2O_3 was not found. Thin film with 5% Al_2O_3 additives, heat-treated at 800℃, showed the sensitivities of about 85% for 100ppm ammonia gas at the working temperature of 300℃. The response time to the ammonia gas was several seconds and the thin film showed good selectivity to NH_3 gas.