전단보강근량에 따른 초고강도 콘크리트를 사용한 고층형 내력벽의 이력거동

윤현도,연길환,정수영,윤석천,이창갑 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.1

Three one fourth scale models using ultra high-strength concrete(f' =704 kg/㎠) are tested under the combined action of a constant axial and a horizontal load cyclically to failure. Such specimens are considered to represent the critical 3-story of low part in 60-story tall building of a structural wall system in area of high seismicity. The amount of vertical reinforcement and the level of applied axial stress are identical for the three wall tested. The cross-section of all walls is barbell shape. The aspect ratio(h /l ) of test specimen is 1.8. The primary objectives of this paper are to investigate the influence of the amount of horizontal reinforcement on the lateral resistance, failure mechanism, ductility and energy-dissipation capability of walls with ultra high-strength concrete. In contrast to what is widely believed, the horizontal web reinforcement does not appear to have a significant effect on shear capacity. Certainly, since the reduction of the web horizontal reinforcement to almost half the value specified by building codes doesn't affect the failure load, this effect in not accounted for by the truss analogy concept. The results obtained have helped to identify the causes of wall failure and have demonstrated that the concepts underlying current ACI Building Code provisions for the design of walls conflict with the observed structural behavior. It has been found that shear resistance is associated with triaxial compressive stress conditions that develop in the compressive zone of the section at the base of the wall.

중학교 컴퓨터과의 수행평가 적용시의 문제점과 해결 방안

현연숙,노영욱 신라대학교 교육과학연구소 2000 교육과학연구 Vol.- No.5

방광 크롬친화세포종과 동반된 배뇨후 벼락두통

하윤석,강성진,허소영,이지현,김민정,김종국,김광수 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1

Thunderclap headache is a hyperacute, severe headache that is so named because the pain strikes suddenly and severely, and is sometimes a sign of a medical emergency. We report a case of pheochromocytoma in the urinary bladder in a 48-year-old woman who presented with recurrent thunderclap headache after voiding and exercise. So we think thunderclap headache during or immediately after micturition may be an important diagnostic clue of bladder pheochromocytoma.

미세형상가공시 센서융합을 이용한 공구 마멸 및 파손 메커니즘 검출

임정숙,왕덕현,김원일,이윤경 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-

A successful on-line monitoring system for conventional machining operations has the potential to reduce cost, guarantee consistency of product quality, improve productivity and provide a safer environment for the operator. In fine-shape machining, typical signs of tool problems such as vibration, noise, chip flow characteristics and visual signs are almost unnoticeable without the use of special equipment. These characteristics increase the importance of automatic monitoring in fine-shape machining; however, sensing and interpretation of signals are more complex. In addition, the shafts of the micro-tools break before the typical extensive cutting edge of the tool gets damaged. In this study, the existence of a relationship between the characteristics of the cutting force and tool usage was investigated, and tool breakage detection algorithm was developed and the following results are obtained. In data analysis, didn't use a relative error compare which mainly used in established experiment and investigated tool breakage detection algorithm in time domain which can detect AE and cutting force signals more effective and accurate.

피스톤 가공용 CNC 선반 HOT-1000 개발에 관한 연구

김경석,김종관,김상복,김성식,정현철,이도윤 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.2

The purpose of this study is the development of a lathe which can cut any pistons of oval shape with high speed, accuracy and precision by CNC (computer Numerical Control) method. Y axis which is the mechanism of position determination with high speed response has been aded to the CNC lathe and ovality and profile has been cut under the synchronous control of C-Y-Z axes. In the case of ovality of Φ0.5mm, the productivity can be improved up to 1500rpm by high speed cutting than modeling method.

쑥 급여 돼지고기의 냉장저장 중 품질특성

김일석,진상근,송영민,하경희,김회윤,남기윤,류현지,하지희 한국국제농업개발학회 2004 韓國國際農業開發學會誌 Vol.16 No.4

쑥 분말 사료를 암돼지 및 거세돈에 첨가하여 그 수준에 따라 0%(T1, 암돼지, T2; 거세돈)와 1.5%(T3; 암돼지, T4, 거세돈)로 각 구별 45두씩 배치, 42일간 급여하여 생산된 돈육의 육질특성은 다음과 같다. 도체중량과 등지방두께는 73가 가장 낮았으며, 도체등급에서는 처리구간 유의차가 없었다(P>0.05). 쑥 분말 급여시 암돼지간(T1과 T3)에서는 조회분, 거세돈간(T2와 T4)에는 조지방 및 조회분 함량이 유의적으로 증가하였다(P<0.05). pH는 저장기간에 증가함에 따라 모든 처리구에서 감소하였으며, 쑥 분말 급여 처리구(T3와 T4)에서다소 높은 pH값을 나타내었다 드립감량은 처리구간에 일정한㎏/㎠경향을 나타내지 않았지만 저장기간이 경과함에 따라 높아졌다. 전단가(shear force, ㎏/㎠)는 T1을 제외한 모든 처리구에서 저장기간이 길어짐에 따라 감소하였다. 명도와 적색도는T3가 T1 보다 다소 높은 수치를 보였으나, 거세돈간(T2와 T4)에서는 오히려 낫게 나타났다. 저장기간이 증가함에 따라 TBARS와 VBN값은 공히 유의적으로 증가하였으며(P<0.05),쑥 분말 급여 처리구(T3 및 T4)에서 유의적으로 더 높게 나타났다(P<0.05). 지방산 분석결과, 포화지방산(saturated fatty acids)은 대조구에 비해 쑥 분말 첨가수준 증가에 따라 포화지방산은 높아지고 상대적으로 불포화지방산(unsaturated fatty acids)은 낮아지는 경향이 있었으나 유의차는 없고, 콜레스테롤의 경우에도 동일하게 유의적인 차이가 없었다. 전체적인 기호도는 신선육 및 조리육 공히 처리구가 낮은 점수를 얻었다. 향후 쑥 분말 급여에 대한 보다 많은 연구가 진행되어야 할 것으로 판단된다. This study was carried out to investigate the feeding effects of mugwort powder on meat quality characteristics for 42 days. The results obtained were as follows; Carcass weight(㎏) and backfat thickness(㎜) of T3 showed the lowest compared with other treatments. Grade scores were not significantly differ among the all treatments. In the proximate composition, crude ash content was higher(P<0.05) in the T3 than that of T1, while, crude fat and crude ash contents in T4 were higher(P<0.05) than those of T2. pH values were tended to low as storage period extended, in particular, those values slightly higher in the T3 and T4. Drip loss(%) was tended to increase during storage. Shear force(㎏/㎠) in all samples showed the decreased during the storage, except for Ti. L^(*) and a^(*) of T3 were slightly higher than those of T1, while, T4 was lower than T3. TBARS and VBN of all samples were significantly increased(P<0.05) as storage period extended, those values significantly higher(P<0.05) in the T3 and T4. There were no differences in saturated fatty acids, unsaturated fatty acids and cholesterol of pork meat between control(T1 and T2) and treatments(T3 and T4). The sensory score of pork samples fed with mugwort power were lower than that of control(T1 and T2) in both fresh and cooked meat. Further studied are needs on the pigs fed with mugwort powder.

진딧물의 경보페로몬인 (E)-β-Farnesene의 합성과 생물활성시험

강석구,정경운,이정운,고현관 성균관대학교 기초과학연구소 1986 論文集 Vol.37 No.1

(E)-β-Farnesene, the alarm pheromone of aphids was synthesized from nerolidol by reacting in a sealed tube at 150℃ for 24h with DMSO. Base(KOtBu/DMSO) catalized elimination of HCl from farnesyl chloride at 50℃ for 4h afforded (E)-β-farnesene as the major product. Farnesyl chloride was prepared from nerolidol or farnesol with SOCl_2 or HCl. Biological activity test of (E)-β-farnesene thus synthesized was conducted.

Profile^(Ⓡ), ProTaper™ 및 K^(3TM) Ni-Ti파일의 과기구 조작이 치근단공 변위에 미치는 영향

양현,양인석,황윤찬,황인남,윤숙자,김원재,오원만 대한치과보존학회 2007 Restorative Dentistry & Endodontics Vol.32 No.2

본 연구는 ProFile, ProTaper 및 K^(3)를 이용하여 과잉 기구 조작에 의해 근관 성형 시 근관의 만곡형태와 Ni-Ti 파일의 종류에 따라 치근단공이 어떻게 변위 되는지를 비교 분석하고자 시행되었다. 본 실험에서는 레진모형근관으로 J자와 S자의 근관 형태가 재현된 ENDO-TRAINING BLOC을 사용하였다. 근관 성형 기구로는 ProFile^(®), ProTaper™, K^(3TM)를 사용하였다. 총 60개의 레진모형근관을 사용하였으며, 사용된 레진모형근관 및 Ni-Ti 파일의 종류에 따라 10개씩 6개의 군으로 나누어 근관성형을 시행하였다. 근관 성형 전·후 이미지를 Image-analyzing microscope 100X를 이용하여 얻고 Photoshop 7.0 프로그램을 이용하여 중첩하였다. 이미지 분석 프로그램을 이용하여 근관 성형 전·후 치근단공의 중심으로부터의 직경 변화량과 면적을 측정한 결과 만곡된 근관의 성형시 치근단공이 주로 만곡의 외측으로 변위됨을 나타내며 ProFile이 ProTaper나 K^(3) 보다 통계적으로 유의성이 있게 작은 변화량을 나타내어 근관성형시 바람직한 기구임을 시사한다. This study was done to evaluate transportation of the apical foramen after 0.5 mm overinstrumentation by ProFile, ProTaper and K^(3) in simulated resin root canal. Sixty simulated resin root canal with a curvature of J and S-shape were divided into two groups. Each group consisted of three subgroups with 10 blocks according to the instruments used: ProFile^(®), ProTaper™, and K^(3TM). Simulated resin root canal was prepared by ProFile, ProTaper and K^(3) with 300 rpm by the crown-down preparation technique. Pre- and post-instrumentation apical foramen images were overlapped and recorded with Image-analyzing microscope 100X (Camcope, Sometech Inc, Korea). The amounts of difference in width and dimension on overlapped images were measured after reference points were determined by Image Analysis program (Image-Pro^(®) Express, Media Cybernetic, USA). Data were analyzed using Kruskal-Wallis and Mann-Whitney U-test. The results suggest that ProFile showed significantly less canal transportation and maintained original apical foramen shape better than K^(3) and ProTaper.

청소년 식이태도와 식이행동의 횡문화적 연구

백영석,안동현,조연규,남정현,최보율,강윤주,고복자 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.3

연구목적 : 청소년을 대상으로 장애가 있는 식이태도 및 식이행동과 관련된 요인들에서 인종과 문화적 차이가 있는가를 보는 것이다. 방 법 : 1996년도에 3129명의 중고등학교 남녀 학생을 대상으로 학교 장면에서 신체 계측과 설문지를 통하여 수집하였으며 연령은 13세부터 16세 사이의 학생들로 분포되었다. 학생들의 분포는 서울 지역의 663명, 양평 지역의 821명, 조선족이 사는 연길 지역의 830명 그리고 한족이 사는 길림 지역의 815명이었으며, 그들은 모두 키, 몸무게, 신체질량지수, 부모의 수입, 아버지의 학력, 체중조절 설문지, 신체상 척도 및 식이태도검사 등의 내용을 완성하였다. 결 과 : 신체질량지수(BMI)에서는 지역, 성별, 사회경제적 상태에 따른 차이가 없었다. 연길과 길림 지역의 학생들이 서울과 양평 지역의 학생들보다 심한 저체중과 심한 과체중을 갖는 학생들이 많았다. 연길과 길림 지역의 학생들이 서울과 양평의 학생들보다 식이태도검사(EAT-26)의 평균치가 높아 식이태도와 식이행동이 나빴다. EAT-26의 20점 이상인 식이장애의 고위험군은 연길 지역의 학생이 6.9%로 네 집단 중에서 가장 많았다. 한국의 양평지역과 서울 지역의 학생들이 신체상 척도(BIS)의 평균치가 연길 지역과 길림 지역의 학생들보다 의미있게 높았다. 즉 한국의 학생들이 중국의 학생들보다 자신의 신체에 대하여 부정적인 생각을 갖고 있었다. 체중조절 행동의 유병율은 서울 지역 학생들이 26.7%, 양평 지역 학생들이 23.2%, 연길 지역 학생들이 10.6%, 그리고 길림 지역 학생들이 4.6%이었다. 식이조절과 운동은 한국의 학생들이, 식이조절과 약물사용은 중국의 학생들이 가장 많이 하는 방법이었다. 결 론 : 본 연구를 통하여 한국과 중국에서도 식이장애가 결코 적지 않을 것이라는 사실을 확인하였고, 식이장애는 인종과 사회문화적 요인에 의해 크게 영향을 받는다는 것, 마지막으로 식이태도와 식이행동 및 그와 관련된 요인들을 통해서 네 지역간의 문화전이 상태를 확인할 수 있었다. Objectives : The goal of this research was to attempt to examine ethnic and cultural differences in factors associated with disordered eating attitudes and behaviors. Methods : Data were collected from the four groups of 3,129 high school students aged between 13 and 16 years who completed school-based survey conducted in 1996. The students (663 Korean urban, 821 Korean rural, 830 Korean-Chinese and 815 Chinese adolescents) completed an instrument which assessed weight, height, Body Mass Index(BMI), parental income, father's level of education, weight control questionnaire, Body Image Scale(BIS), and eating attitudes and behaviors using the Eating Attitude Test-26(EAT-26). Results : BMI did not vary significantly by race, sex, and socioeconomic status. There were many severely underweight and severely overweight students among Korean-Chinese and Chinese than among Korean urban and Koran rural students. The EAT-26 mean scores of Korean-Chinese and Chinese subjects were significantly higher than those of Korean urban and Korean rural subjects. The EAT-26 mean score of Korean-Chinese was the highest among the four racial groups. The prevalence of high risk EAT-26(EAT-26≥20) students of Korean-Chinese was 6.9% which was the highest among the four groups. The BIS mean scores of Korean rural and Korean urban subjects were significantly higher than those of Korean-Chinese and Chinese subjects. The Korean subjects were more dissatisfied with their body than the Chinese. The prevalences of weight control behaviors were 26.7% in Korean urban, 23.2% in Korean rural, 10.6% in Korean-Chinese, and 4.6% in Chinese subjects. Dieting and exercise were most popular for weight reducing in Korean subjects. Dieting and drug use were most popular in Chinese subjects. Conclusion : These data suggest that there must be many eating disorder patients in Korea and China, and the eating attitudes and behaviors are influenced by ethnic and cultural factors. Implications for understanding sociocultural influence on eating attitudes and behaviors and acculturation are discussed.

內部會計管理制度의 導入에 관한 硏究

황윤식,김석현,박정숙 東亞大學校 經營問題硏究所 2006 經營論叢 Vol.27 No.-

The United States Government established Sarbanes- Oxley Act in July 2002 because of the accounting fraud of Enron and Worldcom. The PCAOB(Public Company Accounting Oversight Board) published Auditing Standard No. 2 covering the auditor' s reporting on the ICFR(Intemal Control over Financial Reporting) in March 2004. These regulations were established on the basis of COSO framework. The accounting reform regulations have been introduced for accounting transparency in the aftermath of the foreign exchange crisis in late 1997 in Korea. The Korean Government established the Management’s Assessment Standards for the ICFR and the Accountant’s Review and Reporting Standards for the ICFR in June 2005. The purpose of this study is to find problems and provide future directions to improve the ICFR in Korea by making a comparison between the United State ICFR and the Korea ICFR. And these results of this study are expected to provide useful information regarding the introduction of ICFR in Korea.