사업장 소음 폭로에 의한 일과성 역치 상승과 회복

조수헌,하미나,한상환,주영수,성주헌,강종원,윤덕로,송동빈,이명학,김선태 大韓産業醫學會 1996 대한직업환경의학회지 Vol.8 No.2

To determine the recovery time from noise-induced temporary threshold shift(TTS), a prospective field study was conducted at three worksites where workers are known to be exposed high level of noise. Subjects were selected according to answers on a questionnaire which inquired about otological history and previous noise exposure, including avocational, military and occupational exposures. After excluding employee with past otologic problems, recent exposure to high level noise, and under medications, total 92 employees participated in the study. Among 92 participants, complete consecutive audiometric examinations were carried out at 0∼2 hours, 5∼7 hours, 14∼16 hours after worktime noise exposure on 26 participants wearing hearing protectors and 22 participants wearing no protective devices. The difference between the hearing level 0∼2 hours after noise exposure and 5∼7 hours is statistically significant by paired t-test(p<0.01). The median recovery times calculated from the data of 22 participants wearing no protective hearing devices are 15.6 hours at 4000Hz, and 7.7 hours, 10.3 hours, 8.4 hours at 1000Hz, 2000Hz and 8000Hz respectively. These data suggest that when measuring the pure tone audiometry for noise exposed workers, at least 16 hours noise-free interval is required.

소봉제품의 시장생산 모형 구축에 관한 연구

김수홍,유정빈 한국경영과학회 1996 한국경영과학회 학술대회논문집 Vol.- No.2

소봉제품에 대한 시장생산 모형을 만들기 위하여 과거 자료에서 마련된 수량화된 기초 자료를 통계적으로 분석하고 미래의 생산량을 예측하였다. 출고량에 의한 기초 자료의 통계분석 결과에서 여러 가지 계량적 시계열 분석 방법들 중 STEPAR 방법에 의한 예측 방법이 가장 우수한 것으로 나타났다. 통계분석의 결과로 나타난 출고량에 대한 예측값은 생산량을 결정하는데 있어서 매우 중요한 정보이다. 각 소봉제품들에 대해서 미래의 생산량에 대한 예측값을 STEPAR방법에 의하여 얻었다. 이 예측값들의 95% 신뢰 구간의 폭이 상당히 넓게 나왔다. 이를 개선하기 위하여 체계적인 데이터 베이스 시스템을 구축하고, 수요-생산-재고의 종합적인 관리를 하며, 이를 뒷받침하기 위한 통합 전산 시스템을 구축해야 할 것이다. A forecast on the past output data sets of small bar steels is very important information to make a decision on the future production quantities. In many cases, however, it has been mainly determined by experience (or rule of thumb). In this paper, past basic data sets of each small bar steels are statistically analyzed some graphical and statistical forecasting methods. This work is mainly done by SAS. Among various quantitative forecasting methods in SAS, STEPAR forecasting method was best performed to the above data sets. By the method, the future production quantities of each small bar steels are forecasted. As a result of this statistical analysis, 95% confidence intervals for future forecast quantities are very wide. To improve this problem, a suitable systematic database system, integrated management system of demand-production-inventory and integrated computer system should be required.

백학산(경북 상주)의 식물상

이웅빈,임수진 Yong-In University 2005 自然科學硏究所論文誌 Vol.10 No.1

The flora of Mt. Baekhaksan(615m) was surveyed in this study from the middle of May till the middle of October, 1999. The vascular plants collected from this mountain are as following: Totally 178 taxa those are 4 forms, 28 varieties, 146 species, 106 genera, 60 families, 28 orders, and 4 phyla.. There are 1 taxa in this mountain known distributed only in northern parts, and no taxa known distributed only in southern parts. And there are 7 taxa of special protected plants which was designated from Ministry Environment of Korea, those are 2 taxa of 4th grade, 1 taxon of 3rd grade, 4 taxa of 1st grade. There are 2 taxa needed more ecological study with detail that are Larix gmelini var. prinsipisruprechtii Pilger and Sorbus amurensis Koehne.

성인남자에서 등척성 근력과 등속성 근력에 관한 비교 연구

박수연,최현희,박철빈 경희대학교 체육과학연구소 1999 體育學論文集 Vol.27 No.-

The purpose of this study was to evaluate the difference of isometric and isokinetic muscular strength in collegiate athletes and general students. Sixty players(15 basketball players, 15 icehockey players, 15 baseball players, 15 soccer players) and fifteen volunteered male students were measured using versatile muscle power measuring system and Cybex 770 dynamometer. Grip strength, arm strength and leg strength were measured for isometric muscular strength. And flexion and extension of shoulder, elbow and knee at 60deg/sec(5 repetitions), 180deg/sec(5 repetitions) were measured for isokinetic muscular strength. The results were as follows : 1.Among isometric muscular strength, the highest grip strength was 47.8kg in baseball players, the highest arm strength(flexion and extension) were 18.4kg, 33.4kf in icehockey players, the highest leg flexion strength was 29.2kg in icehockey players and leg extension strength was 69.0kg in baseball players. 2.Among isokinetic muscular strength, the highest peak torque at 60deg/sec among groups were as follows : shoulder flexion in icehockey players(72.6Nm), extension in baseball players(82.4Nm) : elbow flexion and extension in icehockey players(60.1Nm, 76.7Nm) players(82.4Nm) : knee flexion in basketball players(147.0Nm) extension in icehockey players(239.3Nm). 3.The highest average power at 180deg/sec among groups were as follows : shoulder flexion and extension in baseball players(106.0watt, 121.5watt) : elbow flexion and extension in basketball players(69.1watt, 99.7watt) : knee flexion and extension In basketball players(197.7watt, 321.7watt). 4.There were significant in coefficiency correlationship(r=0.468) between isometric arm flexion strength and isokinetic peak torque of elbow. And the coefficiency correlationship between isometric arm flexion strength and isokinetic peak torque of shoulder was 0.344. The coefficiency correlationship between isometric left leg flexion and extension strength and isokinetic peak torque of knee flexion and extension were 0.460, 0.562 respectively.

VCR用 DD캡스턴 모터의 特性 改善을 위한 設計製作 硏究

白壽鉉,任泰彬 東國大學校 1991 東國論叢 Vol.30 No.-

The DD capstan motor for VCR must be designed fast and adaptively as a small, light and slim type and have the high accuracy of control characteristic because the life cycle of its applying machinery has become shorter and it requires high accuracy of control characteristic. In this study, the design theory of the electric and magnetic parts for DD captan motor for VCR is systematized. Also the design theory and manufacturing method of MR sensor device as a speed detector is presented to enhance the accuracy of speed control, and the flux density of permanent magnet is made uniformly so as to magnetize the super multi-poles and as that result the FG with a high output and high accuracy can be designed and manufactured, which has 0.2% maximum fluctuation of the frequency and -60 dB minimum ratio of S/N. Applying these results to the design of DD capstan motor for VCR, the excellency of this can be proved.

커패시터 放電 임펄스 着磁機의 컴퓨터 모델링 및 着磁요크의 磁界解析

白壽鉉,任泰彬,金必洙 東國大學校 1992 東國論叢 Vol.31 No.-

In a capacitor-discharge impulse magnetizer, a magnet is magnetized by the discharging current of capacitors. The conventional design of the magnetizer has been based on many year's experience. The behaviour of flux in the magnetizer should be calculated in order to produce the desired magnets. The analysis of the flux distribution in quite difficult. This is because both the magnetizing current and the applied voltage to the magnetizer are unknown. This paper describes the development of a computer model for a circuit of capacitor-discharge impulse magnetizer using SPICE. Also, the detailed distribution of the flux density in two applied type magnet magnetized by the impulse magnetizer be analyed.

초임계이산화탄소에 의한 유기염소계 잔류농약의 포집효율

임상빈,좌미경,김수현 濟州大學校 産業技術硏究所 1996 산업기술연구소논문집 Vol.7 No.1

Collection efficiencies of organochlorine pesticides by supercritical fluid extraction(SFE) was investigated to develop a simple, fast and inexpensive extraction method. Standard organochlorine pesticides mixture(SOPM, no water) showed no evidence of metering valve plugging in contrast to the plugging associated with SFE of fish tissues(wet sample). Maximum percent recovery of SOPM was obtained at bar by collecting the extract within 3 min through the metering valve without heating into a capped screw-top tube half filled with solid CO_(2) Recovery of SOPM itself shwes 98.3% while recovery of that spiker in fish tissue 85.6%.

운동수행시 혈청효소 변화 분석

박철빈,이상민,박수연 경희대학교 체육과학연구소 2000 體育學論文集 Vol.28 No.-

This study aim to compare the effects of acute physical exercise on the serum enzyme, Creatine phosphokinase(CPK), Lactate dehydrgenaes(LDH), glutamic axaloacetic transaminase(GOT) and glutamic pyruvic transaminase(GPT) in two groups of Body Mass Index. The subject was divided two groups of 8 normal(BMI〈23) and 8 obesity (BMI〉30). The exercise consisted of running on a mater driven-treadmill until the subject reached exhaust. Blood sample were drawn from the antecubital vein before, immediately after exercise, postexercise 30 minute and postexercise 60 minute. Serum enzyme activity increase immediately after exercise the end of the tradmill test in the both groups for CPK(24.5%), LDH(15.3%), GOT(39.0%), and GPT(20.6%), and gradually decrease postexercise 60 minute to approximately to base activity. The serum enzyme activity significantly different between normal and obesity groups in before exercise of CPK(40.8%), LDH(14.7%), GOT(27.&%), and GPT(72.4%)(p〈0.05), and the immediately after exercise activity nonsignificantly different for CPK(29.0%), LDH(2.9%), GOT(8.1%), but GPT is significantly different(p〈0.05). It is concluded from this study that serum enzyme activity rise after exercise and recover to the base activity after postexercise 30 and 60 minute. It is indicate that sarum enzyme release to blood from skeletal muscle, tissue and organ. Obesity group's serum enzyme activity more higher than normal group is important pathological examination especially GOT, GPT.

대기압 배리어 방전을 이용한 포토레지스트의 에싱

이수빈,김윤기 한밭대학교 2004 한밭대학교 논문집 Vol.21 No.-

다량의 산소를 함유한 가스의 대기압 배리어방전을 이용하여 포토레지스트를 효과적으 로 제거할 수 있다. 6kV, 30kHz의 교류전원을 이용하여 균일한 필라멘트형태의 배리어방전을 형성하여 포토레지스를 제거하였다. Ar/0₂ 및 He/0₂ 혼합가스를 이용한 경우 포토레지스트의 제거속도는 산소가 20% 인 경우 최대가 되었다. 혼합가스 중 산소가스의 농도가 동일한 조건에서 방전가스를 Ar/He/0₂ 혼합가스를 이용한 경우 포토레지스트의 제거속도가 Ar/0₂ 및 He/0₂ 혼합가스를 이용한 경우에 비하여 빠르다. 산소를 40% 함유한 Ar/He/0₂혼합가스에 과산화수소(H₂O₂)를 첨가한 배리어방전의 경우 제거속도 0.33μm/min 의 가장 빠른 포토레지스트 제거속도를 얻었다. 주사전자현미경 관찰로부터 포토레지스트는 필라멘트형 배리어방전에 의해 균일하게 제거되기보다는 선택적으로 제거되는 양상을 보인다. Photoresist was etched by uniform filamentary type dielectric barrier discharge (DBD) generated at atmospheric pressure and high concentration of oxygen in total gas. The filamentary type DBD was driven by an AC voltage of 6kV at a frequency 30kHz. The optimum concentration of oxygen to get maximum ashing rate was 20 percent in Ar/0₂ and He/0₂ gas mixture. The photoresist was removed faster using Ar/He/0₂ mixture than using Ar/0₂ and He/0₂ mixture at the same concentration of oxygen. The fastest ashing rate is 0.33μm/min at 40 percent of oxygen in Ar/He/0₂ mixture added with H₂O₂. From SEM image taken after ashing using filamentary type DBD for a few minutes we found that photoresist was removed not uniformly but selectively.

競技種目別 運動選手들의 筋力에 관한 硏究

박철빈,송종국,박수연,박찬호 경희대학교 체육과학연구소 1996 體育學論文集 Vol.24 No.-

The purpose of this study was to estimate physique and muscular strength in collegiate athletes. On a sample of 70 athletes (basketball, baseball, soccer, and ice-hockey) anthropometric measurements (height, weight, bone width, circumference and skinfold thicknesses) were taken, For the measurements of muscular strength grip strength, back strength, arm flexion and leg extension strength were tested. The results of this study showed that basketball players were highest for height, weight, humorous and femur diameters, chest circumference, and calf circumference. Ice-hockey players were highest for upper arm and flexed upper arm circumferences. On the other hand ice-hockey players were lowest for height, soccer players for weight, baseball players for humerous and femur diameters, soccer players for chest circumference. For skinfold thickness baseball players (10.1mm) were highest for triceps, basketball players (14.5mm) for subscapular, ice-hockey players (13.3mm) for suprailiac and medial calf (9.0mm) skinfold thicknesses. While soccer players were lowest for triceps (8.7mm), subscapular (8.6mm), suprailiac (9.8mm) and medial calf (7.5mm) skinfold thicknesses. There were significant differences (P〈0.01) for height, weight, femur diameter, upper arm and flexed upper arm circumferences among athletes. Grip strength (left and right) was highest in baseball players (52.1kg, 50.8kg) but lowest for soccer players (42.3kg, 42.8kg). Baseball players were highest for back strength (162.0kg). On the other hand back strength was lowest in ice-hockey players (127.1kg). For arm flexion and leg extension strength (left, right) basketball players (42.0kg, 44.9kg) were highest for both strength tests. While soccer players were lowest for arm flexion strength and baseball players for leg extension strength. Ice-hockey players were highest for sit-up (59.2). Significant differences (P〈0.01) were found for grip, back, arm flexion and leg extension strength and sit-up among athletes.