가상공간의 가공 공정과 상태 구현에 관한 연구

이수훈,김봉석,홍민성,김종민,JUN NI,박상호,송준엽,이창우,하태호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

This paper presents virtual machining system in order to realize turning process in virtual space. A reliable virtual turning process simulation was developed based on the surface shaping system which is capable of considering geometric model, thermal error model, and vibration model. Accuracy of surface shape resulting from proposed machining simulator was verified experimentally. This paper also developed the watchdog agent that continuously assessed, diagnosed, and predicted performance of products and machines in machining. The Watchdog agent extracted feature signal using time-frequency analysis among various signals from multi-sensor and evaluated machining condition using performance confidence value.

냉장고 압축기의 소음불량 원인 분류를 위한 딥 러닝 활용 방안

이동현(Dong-Hyeon Lee),장준영(Jun-Young Jang),정의봉(Weui-Bong Jeong),홍진숙(Chinsuk Hong) 한국소음진동공학회 2019 한국소음진동공학회 학술대회논문집 Vol.2019 No.10

中學 科學敎育의 探究學習에 대한 評價問項 開發 (Ⅱ)

閔庚德,楊洪準,李善行,鄭遠佑,이병교,金裕漢,羅長薰 경북대학교 과학교육연구소 1985 科學敎育硏究誌 Vol.9 No.-

This study was accomplished to develope the evaluation items for inquiry learning in the 2nd grade Middle School Science for the consecutive study of the evaluation items for inquiry learning in the 1st grade Middle School Science(U-Hang Ki et al, 1984). In this study, paper and pencil test items and performance test items are made by analyzing the abilities of inquiry according to the contents and four basic experiments from each unit in the 2nd grade Middle school science. These evaluation items were applied to tke five classes of the 2nd grade of middle school to test their validity. It is desirable that performance test schuld be used for the evaluation for the abilities of inquiry which can not be evaluated by paper and pencil test. In the evaluation methods of performance test, tester evaluation, peer evaluation and self-evaluation can be applied to the science class in a multi-student class. In higher grade, however tester evaluation is more desirable than peer and self evaluation. It is found that peer evaluation and self-evaluation make possible the perfect study by feedback.

장중첩증을 동반한 맹장 지방종 1예

홍의실,나병규,김민옥,유일영,채지영,채희복,윤세진,이상전,송형근,박길선,정현용 충남대학교 의과대학 의학연구소 2002 충남의대잡지 Vol.29 No.2

대장 지방종은 주로 우측 결장에 호발하고 특히 회맹판 부위와 맹장 부위에 호발한다. 또한 50~60대에 빈도가 높고 증상이 있는 환자에서 장중첩증이 높게는 40~50%에서 보고되고 있어 성인 장중첩증의 원인으로 중요한 비중을 차지한다. 특히 성인 장중첩증 및 장폐쇄의 중요 원인인 악성 종양과 임상 양상이 유사하여 감별진단이 중요하다. 저자들은 반복적인 복통을 주소로 내원한 환자에서 맹장의 4×5㎝의 점막하 지방종이 말단 회장부위와 반복적인 장중첩중이 발생했던 1례를 부분 절제술로 치료하여 양호한 임상 경과를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Lipomas are one of the most common benign nonepithelial tumors of the colon which are often detected incidentally by radiologic investigation or on operation. These tumors are usually without specific symptoms. Colonic lipomas occur most often in the right colon, particularly in the ileocecal valve and the cecum. Most patients are asymptomatic. but tumors larger than 2 cm tend to produce a change in bowel habit. abdominal pain. rectorrhagia and complications including luminal obstruction or intestinal intussusception. Diagnosis can be made by colonoscopy abdominal CT. MRI, or barium enema. We report a case of lipoma of the cecum that originated in the submucosa and presented as a intussusception in a 50-year-old woman with a brief review of the literature.

석재산업체에서 발생하는 분진의 특성 및 저감방안에 관한 연구

민경원,진호일,신홍준,박진동 강원대학교 부설 석재복합신소재 제품연구센터 2004 석재연 논문집 Vol.9 No.-

석재 및 골재를 생산하는 석산사업장은 노천에서의 공정으로 발파, 파쇄, 선별, 운반과정에서, 석가공업체는 절삭 및 가공공정에서 주요한 공해요인으로서 분진이 발생한다. 국내에 분포하는 석·골재업체 중 석산에서 발생하는 분진의 평균농도가 약 3배 이상 높게 나타나며, 작업장의 위치별로는 발파를 위한 천공작업장 부근과 석판재를 절삭하는 갱쏘 작업장 부근에서 가장 높은 부유분진의 농도를 보였다. 채취한 강하 분진시료의 참비중은 전체적으로 2.46~2.72의 범위를 나타내었으며, 평균 입도는 11.6~116 ㎛의 범위를 보였다. 강하분진의 pH는 전체적으로 7.28~9.45의 범위값을 보여 약 알카리성 특징을 나타내었었고, 작열감량(loss on ignition; LOI)은 0.28~6.24 wt%의 범위를 보였으며, 강하분진의 화학조성은 광물조성에서와 같이 대상암석돌의 일반적인 화학조성과 유사한 특성을 나타내었다. 석산에서 부유분진이 대기로 확산되는 것을 억제하기 위하여는 분진의 발생을 최소화 할 수 있는 발파 설계법을 도입하고, 분진의 배출 방향을 통제하여 배출구 부근에서 집진장치나 방진망을 설치하면 효과가 있을 것이다. 석·골재 파쇄, 석가공, 운반 등 전 관정에서 분진의 발생과 확산을 억제하기 위하여 적절한 살수, 분진발생지점에서의 집진, 확산경로에 방진망의 설치 및 운반과정에서 제 규정 준수는 분진이 대기로 확산되는 것을 상당량 억제할 수 있을 것이다. Particulate matters, major pollutants discharged from rock quarries and stone manufacturing plants producing stones and aggregates, are originated in the processes of outdoor blasting, crushing, separation and transportation, and indoor cutting and processing. The average concentration of airborne dust from rock quarries is about three times higher than that from stone manufacturing plants, and drilling sites at rock quarries and gang saw areas show the highest concentration of airborne dust, respectively. Samples of fallen dust whose mineralogical and chemical compositions are related to parent rocks have true specific gravity of 2.46 to 2.72, average grain size of 11.6 to 116 ㎛, pH of 7.28 to 9.45 and LOI of 0.28 to 6.24wt%. A controlled blasting method should be adopted and dust collectors or dustproof nets in the course of dust dispersion will be effective to reduce emission and dispersion of airborne dust from rock quarries. Appropriate water spray, dust collection at dust emission points, dustproof nets, and speed limit of transportation vehicles are helpful schemes to mitigate emission and dispersion of airborne dust discharged in the processes of crushing, processing, transportation and etc. from stone and aggregate industries.

Citrobacter sp.에 의한 Triphenylmethane계 색소의 분해

민상기,조영배,전홍기 부산대학교 유전공학연구소 1995 분자생물학 연구보 Vol.11 No.-

염색공장 폐수처리장의 폭기조로부터 분리한 Citrobacter sp. SK-3균주의 생육 특성을 검토하고, triphenylmethane계 색소중 염기성 염료로 사용빈도가 높은 crystal violet을 비롯한 pararosaniline, brilliant green등에 대한 분해능을 조사하였으며, crystal violet의 분해산물을 HPLC로 추정하였다. Citrobacter sp. SK-3균주의 triphenylmethane계 색소를 분해하기 위한 최적배지 조성은 최소 무기염배지에 탄소원으로서는 galactose 0.5%, 질소원으로서는 beef extract 0.1%, 초발 pH는 8.0-9.0 였으며, 최적배지에 crystal violet 200ppm을 첨가하여 40℃ 부근에서 배양하였을 때 24시간 이내에 100%의 분해율을 나타내었다. Citrobacter sp. SK-3균주는 triphenylmethane계 색소중 crystal violet뿐만 아니라 malachite green, pararosaniline, brilliant green, methyl violet, basic fuchsin 등과, Azo계 색소인 methyl red를 분해하였다. Citrobacter sp. SK-3균주는 무기염 배지상에서 crystal violet, brilliant green을 유일한 탄소원, 질소원으로 이용하여 생육 가능하였다. Citrobacter sp. SK-3균주에 의한 crystal violet 분해산물을 TLC 및 HPLC로서 분석한 결과, crystal violet의 기본골격에 결합된 methyl기가 점차 demethylation되어 pentamethyl-, tetramethyl-, trimethyl- pararosaniline등의 물질들로 분해되어짐을 확인할 수 있었다. The optimal condition for degradation of crystal violet and other triphenylmethane dyes by Citrobacter sp. SK-3 isolated from the activated sludhe of dye manufacturing factory was investigated. The optimal culture medium for the degradation of triphenylmethane dye was composed of minimum inorganic salt medium supplemented with 0.5% galactose, 0.1% beef extract, with the initial pH of 8.0 to 9.0. Under this condition, Citrobacter sp. SK-3 degraded 200ppm of crystal violet completely within 24 hours. Citrobacter sp. SK-3 also degraded efficiently malachite green, pararosaniline, brilliant green, methyl violet, basic fuchsin and methyl red. Analysis of the degradation products of crystal violet through thin layer chromatography and high performance liquid chromatography indicated that the methyl groups bound to crystal violet backborn were gradually demethylated to pentamethyl-, tetramethyl- and trimethylpararosaniline.

군 전술통신체계 NODE에 접속된 사단급 지휘소 블루투스 적용방안연구

전영우,김광훈,김민홍 京畿大學 社會科學硏究所 2001 경기대학교 기초과학논문집 Vol.14 No.1

Effect of Impact Velocity on Interface Characteristics of HT‑9 Steel Joints Fabricated by Magnetic Pulse Welding

Jun‑Woo Song,Jin‑Ju Park,Gyoung‑Ja Lee,Min‑Ku Lee,Kyu‑Hyun Park,Soon‑Jik Hong,Jung Gu Lee 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3

The weldability window in magnetic pulse welding (MPW) is proposed for the end-closure joining of HT-9 steel tubularworkpieces. Based on both theoretical and experimental investigations, the impact velocity of the flyer tube at the momentof collision had a dominant effect on the bonding characteristics of the resultant joints and the optimal impact velocity wasestimated to be in the range of 265–290 m/s in this alloy system. Under the optimal process conditions, no leak was detectedduring helium leak testing. Moreover, the integrity of the joint interface was preserved until the tube section ruptured duringinternal pressure burst testing. For HT-9 steel, the ductile δ-ferrite phase produced by the localized interfacial melting duringMPW acted as an effective obstacle to crack propagation, thereby enhancing the fracture resistance of the joint interface. Allof the results demonstrated the high integrity and durability of the HT-9 steel tube assembly fabricated by the MPW process.

한국 성인을 대상으로 한 전산화 Standard Progressive Matrices의 표준화 예비연구

홍경수,이민수,오병훈,하규섭,유한익,이창욱,연병길,김성윤,신민섭,김재진,권준수 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

연구목적 : 전산화 Standard Progressive Matrices(SPM) 검사의 한국인 성인 표준자료를 확립함으로써, 간이로 지능을 평가하는 경우에도 보다 정확하게 지능지수를 추정하기 위해서 본 연구를 수행하였다. 방 법 : 18세 이상의 남녀 정상인 자원자 353명을 대상으로 전산화 SPM 검사를 시행하고, 백분율 및 표준점수(T-점수)를 기준으로 하여 표준화 자료를 작성하였다. 전체 대상군을 성별, 연령별로 구분한 후 평균과·분포가 유사한 집단은 군을 합치는 방법을 사용하였다. 한국인 표준자료에 근거하여 추정한 SPM 지능지수와 외국인 표준자료에 근거하여 추정한 SPM 지능지수를 각각 KWAIS 지능지수와 비교함으로써 타당도를 검증하였다. 결 과 : 18∼30세, 31∼40세, 41∼50세, 51세 이상의 연령군으로 구분된 한국 정상 성인의 SPM 표준화 자료를 산출하였다. 본 연구 결과에 의한 표준화 자료를 적용하여 지능지수를 추정하는 것이 현재 사용하고 있는 외국인의 표준화 자료를 이용하는 것보다 KWAIS 지능지수에 더욱 근접한 결과를 보였다. 결 론 : 18세에서 50세까지의 한국인 남녀에게는 간이지능평가도구로서 전산화 SPM 검사의 한국인 표준화 자료를 유용하고 타당하게 적용할 수 있음을 확인하였다. Objectives : We conducted this study to provide standardized data of the computerized Standard Progressive Matrices(SPM) test in Korean adults. Methods : The computerized SPM test was administered to 353 healthy volunteers aged 18 years over. We provided the standardized data(percentile and standardized T-scores) for the groups with similar mean and distribution of SPM scores, which was originally divided by age and sex. The validity of the new standardized data was tested by comparing IQs estimated by SPM and K-WAIS. Results : The standardized SPM data were provided for four age groups : 18 to 30 years, 31 to 40 years, 41 to 50 years, 51 years and over. IQ estimated by this standardized data tends to be closer to IQ by K-WAIS than the IQ estimated by foreign normative data. Conclusion : The standardized data of the computerized SPM were proven to be a useful and valid tool for measuring IQ briefly, compared with the conventional way of measuring IQ.

스쿠버 다이빙시 안전수역과 해양수역의 변화에 따른 혈중 젖산농도 및 CPK량의 변화 비교

홍성준,이상학,김민환,김기운 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.20 No.1

For the comparative analysis of the blood lactate concentration of scuba diver according to change from safety zone to sea and of the change of amount of CPK while scuba diving, C university measured the blood lactate concentration and amount of CPK against middle level and debutant scuba divers. As a result, the following differences ranging from 1) to 4) were found in divers by each factor. 1) The blood lactate concentration and CPK amount of clivers out of safety zone were 2.68 and 225.70 respectively. They were out of sea area 3.70 and 337.90 respectively. The change in blood lactate concentration out of safety zone was higher than out of sea area and CPK amount was found higher from safety zone than from sea area. But to find what differences between the blood lactate concentration and CPK amount between safety zone and sea area, I implemented independent T-test against average differences, the significance of blood lactate was .092 while that of CPK amount was .312. Therefore, the blood lactate concentration and CPK amount were not significant in safety zone and sea area. In other words, there is no significant differences in change of blood lactate concentration and CPK amount of clivers in change from safety zone to sea area. 2) The average blood lactate concentration and CPK amount in 30 minutes after going out of safety zone were 2.04 and 259,80 respectively and the average blood lactate concentration and CPK amount in 30 minutes after going out of sea area zone were 2.28 and 377.60 respectively. The blood lactate concentration and CPK amount during 30-min rest after going out of safety zone were found higher in sea area. But to find what differences between the blood lactate concentration and CPK amount between safety zone and sea area in 30 minutes out of waters, I implemented independent T-test against average differences, the significance of blood lactate was .592 while that of CPK amount was .307. Therefore, the blood lactate concentration and CPK amount after 30 minutes were not significant in safety zone and sea area. In other words, there is no significant differences in change of blood lactate concentration and CPK amount of divers in change from safety zone to sea area. 3) During stabilization of divers, the average blood lactate concentration and CPK amount were 2.66 and 290.80 respectively, the average blood lactate concentration and CPK amount after going out of safety zone were 2.68 and 257.70 respectively and the average blood lactate concentration and CPK amount during 30 minutes after going out of safety zone were 2.04 and 259.80 respectively and the average blood lactate concentration and CPK amount after going out of sea area were 3.70 and 377.90 respectively and the average blood lactate concentration and CPK amount during 30 minutes after going out of sea area were 2.28 and 377.60 respectively. From the above results of higher concentration and CPK of divers going out of sea area, the sea environment gives more impact on divers. 4) The conclusion of each factor and rest is as follows: The significance of blood lactate concentration and CPK amount during stabilization and out of safety zone were .961 and .666 respectively. Therefore, there is no significance in divers resting and going out of safety zone. The significance of blood lactate concentration and CPK amount during 30 minutes of rest and out of safety zone were .083 and .683 respectively. Therefore, there is no significance during 30 minutes of divers resting and going out of safety zone. The significance of blood lactate concentration and CPK amount during stabilization and out of sea area were .035 and .514 respectively. Therefore, there is no significance in clivers resting and going out of sea area. The significance of blood lactate concentration and CPK amount during 30 minutes of rest and out of sea area were .292 and .507 respectively. Therefore, there is no significance during 30 minutes of clivers resting and going out of sea area.