• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.213-219
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• 2003

Acoustic emission behavior during fatigue crack growth test was investigated under various loading condition. To describe the acoustic emission activity, counts rate (d/dn) was related with SIFR (stress intensity factor range, K). Results indicated that SIFR could be divided into two parts according to its relationship with counts rate. For $K<25_{MPa\sqrt{m}}$, counts rate was increased as the SIFR increased. However, for values greater than $25_{MPa\sqrt{m}}$ , decreasing behavior was shown. This behavior of counts rate corresponding SIFR was keeping the same trend regardless of load range or crack length. Acoustic emission response to the single overload was sudden drop and slow recovery in counts rate like crack growth retardation. Under variable loading condition, counts rate of each loading block was same as that of constant amplitude loading. Overall experimental data was somewhat scattered since sensitive characteristics of acoustic emission method. However, these empirical relations indicated that counts rate was uniquely correlate with single parameter, SIFR.

• 대한조선학회지
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• 제23권3호
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• pp.17-26
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• 1986

A new relationship between total acoustic emission counts per cycle and crack growth rate is derived in terms of stress intensity factor to explain the acoustic emission behavior due to fatigue crack growth. The experimental results of the total acoustic emission counts per cycle obtained from aluminium 5,000 series alloy specimens are compared with the theoretical values. Both experimental and theoretical total acoustic emission counts per cycle result in the linear relationship to the crack length.

• 한국정밀공학회지
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• 제12권9호
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• pp.74-85
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• 1995

The purpose of this paper is to evaluate the grade of WA vitrified and resinoid bond grinding wheels by the sue of AE measuring system. When the manufactured 48 kinds of specimens were scratched by the method of OKOSHI'S grade test, the relationship between the amount of bit scratch depth of grinding wheel specimens and the character- istics of AE signals, and the relationship of AE counts and grade were considered as fololws; (1) The higher the grades are AE cumlulative event counts N and AE event count rate n, the smaller the values tend to be. But A $E_{rms}$is in reverse. (2) In the case of same grade, the smaller the grain size is, the higher the value of AE cumulative event counts N and A $E_{rms}$is results of comparison and observation. The grinding wheel with lower elasticity and with higher percentage of pore detected higher value of AE cumula- tive event counts N than with higher elasticity and lower percentage of pore. But A $E_{rms}$ is in reverse. (3) AE cumulative event counts N and bit scratch depth h have normally one to one correspondence. (4) It can be expected that quantitative evaluations of grade by using AE have been carried out by the wave observation of AE signal in line with the relationship between load speed of bit and AE cumulative event counts N & AE event count rate n.' AE event count rate n.ate n.

• 대한방사선기술학회지:방사선기술과학
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• 제7권1호
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• pp.85-92
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• 1984

It is a esperimental report to investigation for optimum window-width on radionuclides $^{131}I\;and\;^{198}Au$ The obtained results were as follow; 1. In case of $^{131}I$, 1) The lowest counts produced at the window-width of 10KeV and 20KeV. 2) The count rate, more increased, when the window-width more opened, but the counting efficiency is very good between 70KeV and 130KeV window-width (19.23% -35.71% about the peak energy). 3) The heighest counting rate per KeV of window appeared at 130KeV window-width. 4) BKG counts increased proportionally to the wider window as 5.473 + 0.016 cpm. 2. In case of $^{198}Au$ 1) The lowest counts appeared at 10KeV and 20KeV window. 2) Count rate more increased, when window-width more opened, but the counting efficiency is very good between 80KeV and 140KeV window (19.46% - 34.06% about the peak energy). 3) The highest counting rate per KeV of the window appeared at 140KeV window. 4) BKG counts increased proportionally to the wider window-width as 4.74 + 1.09 cpm.

• 한국가금학회:학술대회논문집
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• 한국가금학회 2006년도 제23차 정기총회 및 학술발표회
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• pp.86-87
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• 2006

The hatchery sanitation has a significant impact on chick quality. This study was carried out to investigate the bacterial contamination in the broiler hatchery. The aerosol bacterial contamination was low except for the operating hatcher that the bacterial counts were measured almost over 300 counts/64cm$^{2}$. The bacterial contamination of the facilities and equipments had a similar tendency as compared with the aerosol bacterial contamination. More than six groups of the Salmonella species were isolated almost from the hatcher and the related facilities and equipments. Also, in this study, we compared the effects of four methods of 37% formalin adminstration in hatcher. At hatch, the aerosol bacterial counts in hatcher receiving 37% formalin as constant rate infusion method during hatching were significantly lower than in each hatcher receiving 37% formalin once at transfer and not receiving 37% formalin, respectively(p<0.05).

• 전기전자학회논문지
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• 제26권4호
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• pp.622-627
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• 2022

본 논문에서는 공격 횟수와 공격 유형을 모두 고려하여 차량 내 네트워크에서 해킹을 탐지하는 침입 탐지 시스템의 성능을 개선하는 기법을 제안한다. 침입 탐지 시스템에서 침입을 정상으로 잘못 인식하는 FNR(False Negative Rate)과 정상을 침입으로 잘못 인식하는 FPR(False Positive Rate)은 모두 차량의 안전에 큰 영향을 미친다. 본 논문에서는 일정 홧수 이상 공격으로 탐지된 데이터 프레임을 자동적으로 공격으로 처리하며, 자동 공격으로 판단하는 방법도 공격 유형에 따라 다르게 적용함으로서 FNR과 FPR을 모두 개선하는 침입 탐지 기법을 제안하였다. 시뮬레이션 결과 제안하는 기법은 DoS(Denial of Service) 공격과 Spoofing 공격에서 FNR과 FPR을 효과적으로 개선할 수 있었다.

• 대한한방내과학회지
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• 제22권4호
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• pp.519-525
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• 2001

Objectives : In order to study the effect of oriental medical therapy on chronic prostatitis patient, the change of WBC counts on expressed prostatic secretion(EPS) was investigated. Methods : Chronic prostatitis patient who had been diagnosed by EPS test was re-tested as same way after improvement of symptom And then we investigated the change of WBC counts on EPS according to therapeutic period, age, usual habit, herb medicine and symptom of each patient, and his and his sexual partner's past history of STD or UTI. Results : According to the change of WBC counts on EPS, improvement rate was 83.3%, cure rate was 46.7%. The youth who didn't have the usual habit of enduring ejaculation during sexual intercourse, enduring urination and sitting long time a day was improved well. Conclusions : According to the above results, it is suggested that oriental medical therapy is effective to the change of WBC counts on EPS.

• 정보관리학회지
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• 제27권1호
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• pp.103-118
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• 2010

최근 특허기술의 가치평가가 크게 강조되고 있으며, 그 평가의 수단으로 특허의 피인용횟수가 매우 유용한 척도 중의 하나로 받아들여지고 있다. 그에 따라 이 연구에서는 특허의 피인용횟수와 이에 영향을 미칠만한 형태적 기술적 개념적 요인의 17개 변수들 간의 상관관계를 미국특허를 대상으로 5개 주제분야에 걸쳐 분석하였다. 분석결과 특허의 피인용횟수와 일정 수준 이상의 상관관계, 즉 5% 이상의 설명력을 갖는 변수는 페이지 수, 청구항 수, 참고문헌 평균 피인용횟수, 기술분야 특허증감율, 서지결합도, 동시인용도 및 문헌간유사도 등 7개로 나타났다. 또한 이들 변수에 대한 분산분석 결과 7개 변수 모두 전반적으로 대부분의 주제분야 간에 있어서 평균값의 차이가 있는 것으로 나타났다.

• 환경위생공학
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• 제1권1호
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• pp.41-46
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• 1986

This study was performed to investigate the sanitation of restaurants in Seoul Area. The subjects were 153 wet towels, 64 cold noodle soup and 190 barely tea. The results were as follows: In wet towels: The detected rate of standard plate counts was $86.9\%$ (133 samples) and average count was $1.8\times10^3/g$ $the detected rate of coliform was $37.9\%$ (58 samples) and average count by MPN method was $2.0\times10^3/100g$, the detected rate of fecal coliform was $15.7\%$ (24 samples) and average count by MPN method was $3.2\times10/100g$. In cold noodle soups: The detected rate of standard plate counts was $100\%$ (64 samples) and average count was $9.4\times10^5/ml$, the detected rate of coliform was $75\%$ (48 samples) and average count by MPN method was $6.0\times10^5/100ml$, the detected rate of fecal coliform was $51.6\%$ (33 samples) and average count by MPN method was $3.4\times10^3/100ml$. In barely tea: The detected rate of standard plate counts was $87.4\%$(166 samples) and average count was $5.8\times10^3/ml$the detected rate of coliform was $66.3\%$ (126 samples) and average count by MPN method was $3.9\times10^3/100ml$, the detected rate of fecal coliform was $32.6\%$ (62 samples) and average count was by MPN method was $4.7\times10/100ml$.

• Preventive Nutrition and Food Science
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• 제6권3호
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• pp.152-157
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• 2001

Accumulated photon counts in immediate measurement after irradiation of marjoram, basil and thyme were shown to be below 625$\pm$162, 577$\pm$178 and 1261$\pm$640 Pc, respectively. The accumulated photon counts increased linearly with increasing irradiation doses up to 5 kGy and slightly increased from 5 kGy to 10 kGy. This trend was similar after storage periods. According to storage conditions, the difference of the accumulated photon counts was net clearly observed. The accumulated photon counts of irradiated spice samples decreased with increasing storage periods. The rate of decrease was higher in 5 and 10 kGy irradiated samples than that in 1 kGy, and in room conditions than that in darkroom conditions. The photon counts of the irradiated spice samples measured for 120 s were higher than those measured for 60 s. The irradiated spice samples showed higher photon counts than those of unirradiated samples in both room and darkroom conditions during all the storage periods. These results indicate that detection of irradiation was still possible after 24 weeks, although the PPSL signal of all spice samples decreased with increasing storage times.