혼합치열기의 miniscrew를 이용한 교정치료

임수민,양연미,김재곤,백병주,이용훈,신정근 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.2

Anchorage plays an important role in orthodontic treatment, Skeletal anchorage like the miniscrew is considered a more effective method in anchorage control than conventional anchorage which needs much patient s cooperation. The miniscrew offers many advantages. 1) It is easy to insert and to remove. 2) It can endure the force needed for moving teeth. 3) It can be immediately loaded and 4) Patient cooperation is not needed. 5) It is economic compared to other skeletal anchorage systems, In comparison to adult's bones, children s bones have comparatively poor bone quality and quantity. Therefore, it is hard to obtain primary stability in younger patients. However, if the miniscrew can be retained successfully, it will be effective in many orthodontic treatments. In these cases we used the miniscrew in correcting of diastema, in aligning dental midline, and in rendering a forced eruption of impacted tooth in mixed dentition patient. We obtained satisfactory results. 교정치료 시 고정원은 항상 염두에 두면서 치료를 진행해야 하는 중요한 요소이다. 전통적인 고정원을 이용한 치료는 환자의 적극적인 협조를 필요로 하고 원하는 치아이동에 대한 반작용이 나타날 수 있는 등의 부작용을 가지고 있다. 그러므로 보다 견고한 구강 내 고정원이 요구되어져 왔으며 이를 위해 miniscrew가 임상에서 흔히 이용되고 있다. Miniscrew를 통한 고정원의 확보는 구외력 의존도 감소,치료기간의 단축,식립 후 즉시 교정력 적용,환자의 협조도 불필요,식립의 간편성,저렴한 비용 등의 장점을 가지고 있다. 그러나 성장기 환자는 성인에 비해 골질이 좋지 않아 miniscrew의 성공률이 성인에 비해 낮다. 그러나 일단 고정에 성공하면 많은 교정치료 시 매우 유용하게 이용할 수 있다. 본 증례는 흔합치열기 환자를 miniscrew를 이용하여 정중이개 및 정중선 불일치,매복치에 대한 양호한 교정치료를 하였기에 보고하는 바이다.

기계시각을 이용한 강구 자동 검사장치

김윤수,박수우,임병훈,김태균,최병재,박철영,이문락,도용태 대구대학교 정보통신연구소 2008 情報通信硏究 Vol.5 No.1

Metal balls are commonly used in mechanical elements and systems including bearings. If there is a defect in a metal ball, it can cause a serious machine failure. By this reason every balls produced are required to be inspected, and the inspection is usually done by human eyes. However, the inspection by human eyes is always with the risk of mistakes, and a need to automate the inspection process is arisen. This paper describes a design of an automatic inspection system for detecting defects on ball surface. A machine vision system is used, and design process and techniques are described in detail. 강구는 베어링을 비롯한 기계 요소 및 장치에서 널리 사용되는 부품이다. 만약 강구에 결함이 있을 시, 이를 사용하는 기계에서 치명적인 결함이 초래될 수 있다. 따라서 제조된 강구에 대해서는 전량검사가 요구되고 있고, 검사과정은 사람의 육안에 의한 검사가 주를 이루고 있다. 그런데 사람에 의한 검사에는 항상 실수의 가능성이 있으므로, 이를 자동화하는 것이 필요하다. 본 논문에서는 강구의 표면 결함을 자동적으로 검사할 수 있는 장치를 설계한다. 기계시각 장치가 사용되었고, 설계에 따른 구체적 절차와 기술들이 서술된다.

전류제어에 의한 단상유도전동기의 기동특성 개선

박수강,최낙일,백형래,임양수,이기용,신사현 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.1

A single phase induction motor(SPIM) with two windings, main and auxiliary, is probably the most widely used motor in the world due to their ruggedness, low maintenance and simplicity of construction There are several ways of starting single phase motors The most popular arrangements is centrifugal switch An auxiliary winding connected in series with a capacitor, is brought into the circuit during starting The closing and opening of the switch must be speed dependant The switch meets the speed requirements, but it also has many drawback random switching, arcing, many models necessary for different speeds and shaft diameters, space required inside the motors and limited lifetime to name some of them. In this paper, the starting current of single phase induction motor was detected by a small detector and determined TRIAC gate signal. The strategy of current control is based on limited main and auxiliary current angle during starting period in the closed-loop control. The experimental result show the motor's starting characteristics of the proposal starting system and are compared with centrifugal switch starting motor.

세라믹 섬유필터를 이용한 디젤 입자상물질 배출저감에 관한 기초연구

주용남,홍민선,문수호,이동섭,임우택 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.3

Works were focused on back pressure characteristics of ceramic fiber filter on DPF(Diesel Particulate Filter) system and experiments were performed to select appropriate filter which can filter particulates. Filters were installed on metal-support tube which has openings for exhaust as flow. Ceramic fiber filters with high specific surface area and adequate high temperature strength are commercially available for filtration of diesel particulates and in-situ hot regeneration. Thus, ceramic blanket and ceramic board which are used as insulating media were applied to filter and filteration apparatus was installed on exhaust as line connected to 2.0L diesel engine. Alternating filter structure to adapt DPF system, collection efficiency test of diesel particulates was measured. In case of ceramic blanket, pressure drop was low, caused by the destruction of soft structures. Also, particulate collection efficiency was decreased depending on loading time. In case of ceramic board, structure design was altered to reduce back pressure on DPF system. Structure design was altered to induce Z-flow by making 10mm and 5mm holes on the surface of media. Alteration of 5mm hole showed that media have low back pressure but particulate collection efficiency was 77%, while 10mm hole showed that of 90%.

土壤水分別 播種期와 窒素施肥方法이 율무의 光合成과 生育 및 엽고병에 미치는 影響

金容撤,李忠烈,崔仁洙,朴賢哲,金成萬,林銖三 밀양대학교 농업기술개발연구소 2000 農業技術開發硏究所報 Vol.4 No.1

In order to establish optimal seeding date and nitrogen fertilization of adlay in barley-dlay cropping system of south-eastern part of Korea, yield and its components of adlay grown under at 3 different seeding dates and 2 nitrogen fertilizations were compared and analyzed. In addition, edible nutriants of adlay grain were compared with rice and woheat, between upland and paddy cultivation, and among three cultivars. The results obtained are summarized as follow: 1.Heading date and maturity date was fasted later seeding date than early seeding. Days to heading was decreased as the seeding date was delayed. 2.Stem leagth, stem diameter and No. of tiller were increased irrigation than control(non-irrigation), and was decreased as the seeding date was delayed. 3.Top and root dry weight were increased moisture were decreased irrigation than control(non-irrigation), and was decreased as the seeding date was delayed. 4.Net photosynthetic rate was increased at treatment of irrigation. Key word : adlay, seeding daye, soil water content, photosynthesis, growth.

칼라영상을 위한 그레이 스케일 로고 영상 워터마킹

박성용,정용덕,임수연,김정화 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.1

This paper is a method to maintain the right of possesion for color images. previous method used an binary data, image, or binary pattern etc. So watermarked image was declined in image quality. But the information for insertion was limited. This paper proposed the method which will change RGB mode of original image to YIQ, at first, we will insert the watermark in the Low frequency cofficient of wavelet transform domain. The watermark use the owner's photo of a digital contents. which is 256 gray-level watermark, and it's size can be changed by the size of original image. As the result of simulation, our method can provide the rightful1 ownership against Rotation, Cropping, JPEG, and Scaling attacks.

사망 진단서(시체 검안서) 작성의 문제점

김규석,임용수,이중의,서길준,윤여규,어은경,염석란,정연권,이윤성 대한응급의학회 2000 대한응급의학회지 Vol.11 No.4

Background: This study was conducted to analyze the current problems in completing death certificates and to identify the correct method for completing death certificates Methods: We reviewed 262 death certificates in three hospitals from March 1 to April 30, 2000, and 119 death certificates in one hospital from March 1 to 31, 2000. We identified major and minor errors and analyzed and compared them retrospectively. Results: A total of 381 death certificates were reviewed: 59 in Seoul National University Hospital,101 in Ewha Woman's University Hospital, and 102 in Gachon Medical College Hospital, which has no education program for completing death certificates in postgraduate training, and 119 in Samsung Medical Center which has an education program for completing death certificates. 358 certificates(94.0%) had at least one error. There were only 23 death certificates(6.0%) without an error. In 182 cases(47.8%), there was one major error. In 321 death certificates(84.3%), there were more than two errors. A comparison of Samsung Medical Center with the other hospitals showed that the number of total errors was statistically different(p=0.001). Conclusion: There were few death certificates without an error in this study. In a hospital which has postgraduate training in completing death certificates, there are fewer errors than in other hospitals which have no training course. Emergency physicians actually certify many deaths, so they must know the correct method of completing death certificates for statistics on morbidity and mortality.

Al-8.7Zn-2.8Mg-2.6Cu+0.1wt.%Sc Al 합금 압출재의 시효 거동 및 기계적 성질

김광삼,심성용,임수근,이상용 慶尙大學校 經營行政大學院 2004 工學硏究院論文集 Vol.20 No.-

7000계 알루미늄 합금은 시효경화에 의해 기계적 성질이 크게 향상됨으로 항공기 등 수송기기의 구조재료로서 이용되고 있으며, 합금이 개발된 이후 지속적인 성능향상을 위한 연구가 진행중이다. Al 합금에 있어 Sc 첨가는 Al_(3)Sc 상의 생성에 의한 결정립 미세화 및 분산 강화에 의해 효과적으로 강도를 향상 시킬 수 있다. 따라서 본 연구에서는 Al-8.7Zn-2.8Mg-2.6Cu+0.1wt.%Sc 합금 압출제를 이용하여 시효 열처리를 실시하여 시효 거동과 기계적 성질을 조사하였으며, 열처리에 따른 기계적 성질을 조사하였다. 압출재의 미세 조직 관찰 결과 Al_(3)Sc상이 기지 전반에 압출 방향으로 분포되어 있음을 알 수 있었고, 시효 거동 관찰 결과 최대경도 지점이 2400분에서 나타났으며, 시효 경화성 또한 기존의 Al7075 합금 보다 우수하였으며, 강도 증가에 있어서도 T6 처리한 경우 인장강도 657MPa로 나타났으며, 연신율의 경우 5%이었다.

발열이 있는 호중구 감소증 환자에서의 위험도 예측인자

정중식,권운용,김규석,임용수,이중의,서길준,윤여규 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3

Background: Most febrile neutropenic patients are treated in an aggressive manner. However, identification of low-risk patients may enable clinicians to administer risk-based treatment. The object of this study is to certify the factors associated with increased risk at the time of visiting the emergency department. Methods: This is a retrospective study. We reviewed the medical records of 101 febrile neutropenic patients who had visited the emergency department of Seoul National University Hospital from January 1998 to August 1999. We assumed 22 risk prediction factors that could be assessed at admission to the emergency department and 5 factors that could be assessed during treatment course. To find independent risk-prediction factors, we analyzed these factors respectively by using multiple regression analysis. Results: Tachycardia(aOR=136.5), altered mentality(aOR=28.8), decreased renal function(aOR=20.1), and significant comorbidity(aOR=17,2) are the independent factors associated with higher mortality. Altered mentality(aOR=31.6) and decreased renal function(CCr < 75㎖/min, aOR=5.4) are those associated with a higher incidence of septic shock. Independent factors associated with persistent(more than 3 days) fever are the early(within 10 days) onset of fever after last chemotherapy(aOR=8.8) and the existence of new pulmonary infiltrates on a simple chest X-ray(aOR=4.3). Conclusion: The stability of vital signs, the change of mentality, the renal function, the existence of significant comorbidity, the existence of new pulmonary infiltrates, and the rate of neutropenia are clinically useful risk-prediction factors in febrile neutropenia at the time of visiting the emergency department.

우리나라 논 관개용 지하수 수질 특성

김진호,조광래,임수정,이경자,경기천,엄미정,김희권,김찬용,이영한,이신찬,윤순강 한국환경농학회 2003 한국환경농학회지 Vol.22 No.4

This study was carried out to evaluate the status of the groundwater quality for paddy fields irrigation in Korea. Water samples were collected at 130 sites throughout the country. Samples were collected at three seasons-April, July and October-in 2000. According to our survey, the groundwater was found to be suitable for irrigation purpose. Average EC was shown 0.286 dS/m. Nitrate-nitrogen and Cl^(-) concentration was 5.6 ㎎/L, 32.95 ㎎/L which satisfied the Korean Standards for Irrigation Water. Nitrate-nitrogen concentration in each province was shown as following orders: Jeju (11.17 ㎎/L) > Chungnam (8.16 ㎎/L) > Gyeongbuk (6.64 ㎎/L) > Gyounggi (5.91 ㎎/L) > Chungnam (4.95 ㎎/L) > Gyeongnam (3.91 mgk) > Jeonbuk (3.50 ㎎/L) > Jeonnam (3.27 ㎎/L) > Gangwon (2.91 ㎎/L). The concentration by sampling seasons were October (6.62 ㎎/L) > July (5.88 mg&) > April (4.78㎎/L). As the soil of Jeju Province is usually derived from volcanic ash soils mainly used for upland drops, it may influence the nitrate-nitrogen concentration of groundwater. The amount of rainfall also influence the water quality. But the COD_(Cr), were shown April (3.17㎎/L) > July (2.91 ㎎/L) > October (2.40 ㎎/L), it is highly related in the basal dose of organic matter fertilizers. This study demonstrated that groundwater quality was suitable for irrigation, but continuous monitoring is recommended for agricultural policy and developing OECD agricultural environment indicators.