도체의 무조건 안정된 전자파 과도산란 해석

윤희상,이화용,정백호 湖西大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.21 No.-

In the paper, we present a time-domain combined field integral equation(CFIE) formulation for analyzing transient electromagnetic responses from three-dimensional(3-D) closed conducting bodies. Instead of the conventional marching-on in time(MOT) technique, the solution method in this paper is based on the Galerkins method that involves separate spatial and temporal testing procedure. Triangular patch basis functions are used for spatial expansion and testing functions for arbitrarily shaped 3-D structures. The time-domain unknown current coefficient is approximated by using an orthonormal basis function set that is derived from the Laguerre functions. These basis function are also used as temporal testing functions. The method to be described results in very accurate and stable transient responses from conducting objects without an internal resonance. Detailed mathematical steps are included and representative numerical results are presented and compared.

Silicoater technique을 이용한 veneered stainless steel crown 수복의 임상적 평가

이상호,이창섭,김왕근,정연화 大韓小兒齒科學會 1999 大韓小兒齒科學會誌 Vol.26 No.1

광법위한 치질파괴가 있는 상악유전치를 갖는 소아에서 silicoater technique에 의한 veneered stainless steel crown으로 수복 후 3∼12개월 동안 주기적 검사와 수복물의 평가 결과, 다음과 같은 결론을 얻었다. 1. 행동조절이 어려운 소아에서 chair time을 감소시킴으로써 행동조절에 도움을 주었다. 2. 유지력,내구성,심미성이 우수하였으므로 유전치부의 광법위한 치질손상시 유용한 수복방법이다. Restoration of severly carious, malformed or traumatically fractured primary incisors is one of the most difficult challenges in restorative dental care for preschloers. In restoring primary anterior teeth, four types of complete coverage crowns have been attempted over the years. Stainless steel crowns, open-faced stainless steel crowns, acid-etched crowns(strip crowns), and preformed polycarbonate crowns have been the choeces. While these restorations have beem accepatable for many patients, they all have very distinct limitations. The ideal full coronal restoration for a primary incisor requires durability, retention, and esthetics. This paper reported veneered stainless steel crown restoration of primary anterior teeth by silicoacter technique. Veneered stainless steel crown restoration by silicoater technique is considered to be a durable, retentive, and esthetic restoration.

섬유강화형 포스트를 이용한 치관-치근 파절의 치료: 증례 보고

임화신,라지영,이광희,안소연,김윤희,금기석,이상봉 大韓小兒齒科學會 2012 大韓小兒齒科學會誌 Vol.39 No.1

The crown-root fracture is defined as a fracture of tooth that contains enamel, dentin and cementum with or without pulp exposure. Generally the fracture lines place obliquely from labial surface, between incisal edge of the crown and marginal gingiva, to palatal surface subgingivally. If the fracture line is located supragingivally, the removal of tooth fragment and supragingival restoration can be performed. In subgingival fracture line, the surgical exposure, orthodontic eruption or surgical eruption can be considered. If the fracture line is too deep to restorate, extraction or decoronation can be selected. In children and adolescents, the extraction should be the last option. Another option to select before extraction is the restoration using fiber-reinforced post and the reattachment of tooth fragment. The fiber-rainforced post enhances the retention and the durability of tooth fragment. The reattachment of crown fragment using resin adhesive system is considered minimal invasive treatment biologically. This case reports the treatment of crown-root fracture using the reattachment of crown fragment and the insertion of fiber-reinforced post. 치관-치근 파절은 법랑질, 상아질, 백악질이 모두 포함된 치아의 파절로, 파절선이 대부분 절단연이나 순측의 변연부 치은 에서 구개측 치은열구 하방으로 사선으로 진행된다. 파절선의 위치가 치은 연상이라면 파절편의 제거 및 치은연상 수복을 시 행하고, 치은 연하라면 파절면의 외과적 노출술, 교정적 정출술, 외과적 정출술을 이용한 치아의 수복이 이루어진다. 그 외에 섬유 강화형 포스트를 삽입하여 치관 수복물의 유지력을 높이고, 레진 접착 시스템을 사용하여 치관 파절편을 재부착함으로 써 생물학적으로 최소한으로 침습적인 치료를 하는 방법도 있다. 만약 파절의 정도가 치은 연하로 깊은 경우 발치나 치관절제 술을 이용한 치근의 유지 등을 고려할 수 있다. 본 증례는 치관-치근파절로 내원한 12세 환아로 섬유강화형 포스트를 사용하여 치관 파절편 재부착을 시행하였으며 양호 한 경과를 보여 이를 보고하는 바이다.

청소년 병원자원봉사자 사전 교육프로그램(PTHV) 개발 및 효과 검증

이연수,최연화 부산대학교 과학교육연구소 2016 교사교육연구 Vol.55 No.2

The present study attempted to develop a Pre-training Program for Teenager Hospital Volunteers (PTHV). The study investigated the following research questions: 1. Is it possible to configure the appropriate Pre-training Program for Teenager Hospital Volunteers (PTHV)? 2. Could a Pre-training Program for Teenager Hospital Volunteers (PTHV) be empirically verified for validity? 2-1. Does a Pre-training Program for Teenager Hospital Volunteers (PTHV) effectively increase the scores of volunteering attitude in the treatment group than those in the control group? 2-2. Does a Pre-training Program for Teenager Hospital Volunteers (PTHV) effectively increase the scores of volunteering motivation in the treatment group than those in the control group? The Pre-training Program for Teenager Hospital Volunteers (PTHV) was developed based on the program development model previously designed in this study. The Pre-training Program for Teenager Hospital Volunteers (PTHV) was made up of 10 sessions: 50 minutes per session and included 30 volunteers volunteered to participate in the program who were randomly allotted into 2 groups of 15. The volunteers of treatment group received the Pre-training Program for Teenager Hospital Volunteers (PTHV), while the volunteers of the control group had no treatment. The final data was collected from 30 volunteers in each group. The program used for data analysis was SPSS 18.0 for Windows and the significance level for hypothesis testing was set at .05. The results were as follows: First, the treatment group showed significantly higher scores than the control group on the levels of volunteering attitude. Second, the treatment group showed significantly higher scores than the control group on the levels of volunteering motivation. In conclusion, this study suggests that the Pre-training Program for Teenager Hospital Volunteers (PTHV) was developed properly.

치과 치료시 잉여아말감과 구강폐액내의 수은함량 추산과 잉여아말감의 적정관리방안

김연화,박태주,이규훈 부산대학교 환경문제연구소 1995 環境硏究報 Vol.13 No.-

This study was conducted to investigate the mercurous content of surplus amalgam and washing solution generated from dental treatment. 300 surplus amalgam and washing solution samples were collected from twenty dental clinics in Taegu. The average mercurous amounts of washing solution and surplus amalgam samples were shown as 0.081 mg/day and 16.81 mg/day, respectively. The Shinchon and Keumho stream were shown as 0.027 mg/L and 1.164 mg/L of mercurous concentration, which would be linked to the 86 dental clinics and industrial complex in the survey area. Based on the annual reports of the medical insurance union, the annual amount of discharged mercury in dental clinics to the sewage was estimated to 9,725.59 g in 1990, 10,223.69 g in 1991, 11,585.12 g in 1992 and 12,188.78 g in 1993. It was founded that the amount of discharged mercury from dental clinics was increased every year and was caused by washing solution and surplus amalgam from dental clinics.

뇌간의 부위별 Enkephalin 함량에 미치는 전기침의 영향

김화연,김중수,이종흔 대한구강생물학회 1987 International Journal of Oral Biology Vol.11 No.2

This study was performed to clarify the effect of stimulation of meridian or nonmeridian point on content of methionine-enkephalin (MENK), which was related with analgesia, in brainstem. Sprague-Dawley rats were anesthetized and a pair of stimulating electrode was inserted into palatal mucosa as nonmeridian point or Ha-gwan which was known as meridian point for control of oro-facial pain. Experimental animals were divided into control, meridian and nonmeridian group, which were subdivided as noxious stimuli group and innocuous stimuli group, respectively. Noxious stimuli were applied with rectangular pulse of 1 msec duration, 5mA and 45 Hz for 30 minutes, and intensity and duration of innocuous stimulation was 200㎂ and 5 msec, respectively. After stimulation of Ha-gwan or palatal mucosa, animals were sacrificed and brain was removed. Brain was separated into midbrain, pons and medulla oblongata immediately. The content of MENK was analyzed by radioimmunoassay. MENK content of midbrain, pons and medulla oblongata was not changed by innocuous stimulation of meridian point and decreased by noxious stimulation. Noxious and innocuous stimulation of palatal mucosa produced decrease of MENK in midbrain, pons and medulla oblongata. And content of MENK showed no difference between meridian and nonmeridian group. In summary, change of MENK content in brainstem was not influenced by position of peripheral stimulation and depended on intensity of stimulation. Decrease in MENK content of brainstem could be related to analgesic effect of peripheral conditioned-stimulation.

더덕 최소가공을 위한 세척, 박피공정 개선

박윤문,이종화 안동대학교 농업과학기술연구소 2000 農業科學技術 硏究論文集 Vol.7 No.-

본 연구는 회전형 brush-type의 더덕박피기 모델을 개발하여 박피효율과 미생물 제거 가능성을 타진하였고 오존수 병행 처리의 효과를 검토하였다. 실험적 규모로써 제작한 박피기는 brush의 강도가 약하고 전체적인 brush 축(박피공정 라인)이 짧아 박피효율이 수작업 대비 70% 수준으로 다소 낮게 나오는 것으로 추정되므로 현장에서 적용하는 실제 크기로 제작할 경우 brush 강도와 line의 길이에 대한 보완이 필요한 것으로 조사되었다. Brush-type 기계 박피 더덕은 외관상 색택이 검게 나타나 수작업 더덕에 비해 상품성이 낮게 평가되지만 육질의 경도가 높게 유지되고 미생물이 대부분 제거되므로 앞으로 박피 더덕에 대한 인식을 바꾼다면 본 연구에서 개발된 수준의 세척, 박피기를 보완하여 현장에서 적용할 수 있을 것으로 기대된다. 다만 유통 중 사포닌 함량의 감소현상에 대한 연구가 보완되어야 할 것으로 판단된다. Brush-type peeling machine for minimal process of lance Asia bell roots were developed and its peeling efficiency and removal potential of microorganism were evaluated in combination with ozonated water treatment. The brush-type model showed relatively low peeling efficiency around 70% suggesting that adjustment of brush strength, length of the line, and rotation power of the machine should be complemented. Marketability of mechanically-peeled roots were evaluated low because of poor appearance compared with hand-peeled roots. The roots, however, showed higher flesh firmness and were almost free of microorganism activity. The results indicated that brush-type peeling machine could be potentially used in the minimal processing industry provided that peeling efficiency is a little improved. Changes in consumers' concept of food quality is another prerequisite. Reduction in saponin content after mechanical peeling and ozonated water treatment is remained to be studied in detail.

처분장근처에서 침식에의한 Sr 화학종의 평형

조윤정,김성현,이인화,김시욱,고문주,박성규,이범규 조선대학교 환경연구소 2000 環境硏究 Vol.16 No.1

Leaching and adsorption equilibria of Sr Chemical Species from the near field of a repository has been studied in solidified cement with Fe and oxidized Fe. The absorption percent, Ads %, and distribution coefficient, K_d were calculated using equilibrium concentration to predict the extent of leaching and adsorption. In the mixed aqueous solutions the Ads % increase as Cement(C)/Water(W) ratios increase and K_d was decreased for Sr. These behaviors were discussed by adsorption and equilibrium of spiked ions. Oxides Fe promoted adsorption of spiked ions, but pure Fe had no effect. E_h values were also estimated and discussed to elucidate oxidation-reduction environment of experimental system.

아파트 1층주호의 생활양태 연구

우동주,이화철,윤석환 東義大學校産業技術開發硏究所 1998 産業技術硏究誌 Vol.12 No.-

The behaviors of dwellers in the 1st floor unit is different from it of upper floor unit. in apartmenthouse. But the unit plans of apartmenthouse have been designed all the same in Korea. The purpose of this study is to find the dweller's behaviors of 1st floors unit for design of proper the unit plan for dwellers' life at the 1st floor in the apartmenthouse. The design of first floor units should be considered with changing usage such as children's playroom, cloth altering shop and other needs of dwellers. And therefor the unit has to be designed to give more flexibility to differentiate from upper floors. The using a common entance as main exit to ground floor unit should be replaced with other means such as individual garden or balcony to make best of its feature as ground floor.

출력귀환과 스카이 훅 제어 방식에 의한 차량 현가 장치의 성능에 관한 연구

김재열,이규태,송찬일,정동화,서윤종,유신 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.4

The dynamic model of the suspension system is developed by using both sky-hook control and output feedback control techniques, based on the performance sensitivity index. Many vehicles use sky-hook control theory operated with only one sensor, due to relatively low cost and easy implementation. On the other hand, output feedback control implemented with state variables has difficulties in measuring such as tire deflection, etc.