건조단계 잠수함 품질정보 기반의 함 탑재장비 신뢰성 분석 및 활용방안

장호성,이관우,최영호,서대수 한국마린엔지니어링학회 2017 한국마린엔지니어링학회지 Vol.41 No.9

This study analyzes the reliability of submarine installed equipment in the building stage, based on quality information, which was acquired for three submarines in the building stage. To evaluate reliability, frequently failing equipment was selected from three submarines for comparison. The failed equipment models were classified into three types: power function NHPP, HPP, and NHPP/HPP mixed type. After confirming the validity of integrating failure models using the military handbook MIL-HDBK- 189), we applied a statistical parameter method for repairable systems to frequently failed equipment. We obtained the interval of failures, TTT (Total Time on Test)-plot, and MCF (Mean Cumulative Function) for the power function NHPP and HPP failure models. Additionally, linear regressions were conducted to calculate MTBF for the sections with changes in failure trends. Achieving submarine delivery on time, improvement in the quality and preventive maintenance of equipment in the building stage could be expected using the results of this study. 건조단계 잠수함의 탑재장비에 대한 신뢰성 분석은 운용중인 잠수함에 비해 상대적으로 미흡한 실정이다. 따라서 본 연구에서는 건조단계 잠수함 3척에 대한 탑재장비 품질정보를 이용하여 다빈도 고장발생 탑재장비를 선정하였으며, 품질정보를기반으로 수리 가능한 시스템에서의 모수적 추정방법을 이용하여 선정된 탑재장비들에 대한 신뢰성 분석을 수행하였다. 미군용규격(MIL-HDBK-189) 검정을 통해 고장발생 모형이 멱함수 NHPP, HPP, 그리고 멱함수 NHPP 및 HPP 혼재된 경우로 분류하여 시스템 통합 적합성 검정 후 고장발생 간격, TTT-plot 및 평균누적함수를 도출하였으며, 고장발생 추세 변화 구간별로각 탑재장비에 대한 직선 회귀식을 제시하였다. 이를 바탕으로 각 탑재장비에 대한 건조단계별 평균고장시간을 나타냈으며, 본 연구 결과는 잠수함 건조 시 품질향상, 함 적기 전력화 및 건조단계 예방정비에 크게 활용될 수 있을 것으로 기대된다.

EUREKA-147 표준에 기반한 DAB 수신용 모듈의 설계

張虎聲,李鍾奭 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-

DAB can carry not only CD-quality stereo sound but also text and images In this study, we designed DAB tuner module based on Eureka-147 standard. This combines two advanced digital technologies for achieve robust and spectrum-efficient transmission of high-quality audio and other multimedia data. For the DAB module, MPEG Audio Layer II system and COFDM(Coded Orthogonal Frequency Division Multiplex) technologies are adopted. Results show a bit rate of up to 1.5 Mbit/s by full rate audio sampling of 48,000 samples/s and spread the 2.3 million bits of the multiplexed signal in time and across 1,536 distinct frequencies within the 1.5 MHz band, so that even if some frequencies are affected by interference, the receiver will still be able to recover the original sound in full.

ITS 시스템의 DSRC 기술 표준에 관한 연구

張虎聲,金榮盛 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-

This paper describes the Requirements Specification of DSRC(Decidated Short Range Communication) for ITS (Intelligence Transportation System) in matching industry solutions to government wishes. Research are focuses on the ITS application for DSRC and discusses the current status of the air interface standards being prepared by North American version 7, European CEN TC278 WG7 and Japanese draft standard ISO TC 204 WG15 which will be proposed. Proposed physical specifications would be to do high speed packet data communica- tion such as Electronic Toll Collection(ETC), Traffic Information, Route Guidance, Fleet Management which will be provided by single On-Board Equipment (OBE).

웹 기반 원격 입출력 제어장치의 설계

張虎聲 홍익대학교 산업기술연구소 2006 産業技術 Vol.16 No.-

Remote I/O control and PC based automation system has been insufficient in its capabilities of handling large data, remote data communication, and integration with other systems. In this study, we develope web based image capturing, monitoring and digital I/O Control system, which has client/server architecture with specially designed control and management software. A system collects and integrates images and controls data from/to various CCD, IR sensor, and actuator in remote areas and stores data in database maintaining high quality of remote I/O informations. It provides the centralized real time data access, analysis and remote control with various internet based management applications.

중학교 레슬링 선수와 일반 학생간의 기초체력 분석 연구

장호성 龍仁大學校 武道硏究所 1997 武道硏究所誌 Vol.8 No.2

The purpose of this study was to compare two group of middle school students, one group of wrestlers and another group of regular students, in their levels of physical fitness. For the methods of this study, 7 wrestlers(group 1: G1) and 7 regular students (group 2: G2) were tested by basic physical fitness test and the data were analyzed by t-test to identity the significant differencer between two groups. The results of this study are as follow: 1. In the test results of muscular strength, abdominal muscular strength of G1 showed higher than G2(G1=69.78±43.05㎏, G2=61.35±42.94㎏) that there was a significant difference between two groups (p<.05). In the test results of ball throwing, there was a significant difference between G1 and G2 (G1=45.14±2.21, G2=41.71±3.79, p<.05). 2. In shuttle run test results, there was a significant difference between G1 and G2 (G1=5.48±0.12 sec, G2=6.45±1.14 sec, p<.05). There was no significant difference in the test of horizontal jump and 50m dash between two group. 3. In the test results of sit-up to examine muscular endurance, there was a significant difference between two groups (G1=46.57±3.45, G2=42.71±3.81, p<.05). In the test results of 1,000m run, there was a significant difference between two group (G1=3min35sec±7.46, G2=4min26sec±9.43, p<.05). 4. In the test results of sit and reach, there was no significant difference between the means of two groups. G1 showed 14.11±4.29㎝ and G2 showed 13.33±5.03㎝. 5. In the test results of agility examined by side step, there was a significant difference between two groups (G1=11.57±1.23 times, G2=9.57 times, p<.05). 6. In the test of results of balance of balance examined by one leg standing with closed eyes, there was no significant difference G1 and G2 showed 28.46±13.36㎝ and G2 showed 27.37㎝..

만삭 전 조기양막파수 임산부에서의 CRP 측정에 관한 연구

장호성,박학열,이흥관,채진호,신해수,박준철 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.7

1996년 6월 1일부터 1996년 12월 31일까지 7개월간 대구 파티마병원 산부인과에 입원한 임신 24주에서 36주 사이의 조기양막파수 임산부 70예를 실험군으로, 같은 재태 기간의 임산부 20예를 대조군으로 하여 만삭전 조기양막파수 임산부에서의 CRP 측정의 의의를 조사하여, 연구한 결과 다음과 같은 결론을 얻었다. 1. 조기양막 파수군에서는 CRP 음성이 74.3% CRP 양성이 25.7%, 대조군에서는 CRP 음성이 95% CRP 양성이 5%로 나타났다. 2. 연령, 분만 횟수, 내원시 임신 주수에서는 group I, group II와 대조군 사이의 유의한 차이가 없었으나, Bishop score에서는 group I 5.5±1.6, group II 6.6±1.7 로 서 두군 모두에서 대조군 3.6±1.0보다 유의하게 높았다. 3. 입원 당시 임산부 혈색소치는 group II에서만 10.6 ±1.3 g/dl로 대조군 11.8±1.1g/dl 보다 유의하게 낮았으며, 백혈구 수치는 group I 11,417.1±2,419.0/ mm3, group II 14,016.7±3,077.1/mm3로 대조군 10,484.5±1,827.2/mm3 보다 모두 유의하게 높게 측정되었다. 4. 임신 지연기간 또한 group I 12.8±10.3일, group II 6.8±7.2일로 대조군의 54.8±17.0일보다 모두 유의하게 짧았다. 5. 분만 형태로는 조기양막파수군에서 질식분만 77.1%, 제왕절개분만 22.9%이었고, 대조군에서는 질식분 만 85%, 제왕절개분만이 15%이었다. 6. 신생아 평균체중은 group I, group II에서 각각 2,245.8±451.6 g, 2,017.8±558.0 g으로 대조군 3,332.0± 394.8 g에 비해 모두 유의하게 적었으며, 분만시 Apgar 점수에서도 1분 Apgar점수는 group I, group II 모두 대조 군보다 낮았지만, 5분 Apgar 점수는 CRP 양성인 group II 에서만 대조군보다 유의하게 낮게 나타났다. 주산기 이환 및 사망률은 group I이 9.62%, 7.69%, group II가 22.2%, 16.7%로 대조군의 5%, 0%보다 유의하 게 높았다. 7. CRP의 융모양막염의 진단에 있어서의 민감도 및 특이도는 각각 83%, 80%이었다. Objective: To evaluate the role of C-reactive protein as a predictor of infectious morbidity with premature rupture of membranes. Study Design: The study group was comprised of seventy patients who presented to the Taegu Fatima Hospital between 24∼36 gestational weeks who had a diagnosis of ruptured membranes. The study group underwent assay of C-reactive protein in the maternal serum, and divided into two groups by the results of CRP, that is 52 cases of CRP negative PROM patients (group I), 18 cases of CRP positive PROM patients (group II), and 20 cases of intact membranes women as a control group. Outcome measures were the occurrence of preterm delivery, the admission-to-delivery interval, maternal characteristics, fetal body weight, 1min & 5min Apgar score, perinatal morbidity and mortality etc. Statistical analyses were performed by means of ANOVA test and Dunnett`s T-test. Results: 1. The prevalence of positive C-reactive protein in premature rupture of membranes was 74.3%. 2. There were no significant differences of age, parity, gestational weeks at admission between group I, II and control group. 3. White blood cell count of group I, II were significantly higher than that of control group. 4. The delay of time from admission to delivery in group I, II were significantly shorter than that of control group. 5. In perinatal outcomes, the mean birth weight, 1 min/5 min Apgar score of group I, II were significantly lower than those of control group, and perinatal morbidity and mortality of group I, II were significantly higher than those of control group. 6. Chorioamnionitis was found in 6 cases of premature rupture of membranes and the sensitivity and specificity of CRP as a test to predict of pathological placental infection were 83% and 80%. Conclusion: C-reactive protein level is a very sensitive predictor of infectious morbidity in premature rupture of membranes.

CAN을 基礎로 한 DeviceNet상에서의 制御 시스템 設計

張虎聲,金爀秀 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-

Assuming a two-state symmetric binary channel model for the physical transmission medium, this paper analyzes the probability of error to be undetectable ay receivers(residual error probability) This paper uses several error detection mechanism to prevent receivers from accepting disturbed data. The analysis of the case of bit errors in the Data and CRC fields of a CAN frame are explained is described by the binominal distribution of residual error probability. As the results, it can be seen that decrease with decreasing frame length and the maximum points move towards greater bit error probabilities because the mean number of bit error in one frame. The results were displayed as a function of the bit error probability of the transmission channel and the decomposition formulae.

ATM Migration을 위한 FDDI LAN의 Topology적 분석

張虎聲,趙允 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-

Asynchronous Transfer Mode(ATM) has a fixed-length packet tranport scheme. It's one of promising proposals in Internet and Broadband ISDN(B-ISDN) for multimedia services. For the access high speed packet data, the traditional FDDI LAN must improved their banwith and traffic control scheme. Topological analysis is one of solution for this problems. In this paper, we suggest a Switched LAN method which improves the transfer speed and network efficience with minor environment change, and discuss various problems and their soultions we have encountered in designing and implementing the ATM migration for traditional FDDI LAN. The proposed scheme is compared with the existing Ethernet bus topology and FDDI ring topology through experiments. The experiment environment is designed highlight the cost efficient, improve data collision and transfer speed. Experimen results show that the proposed star topology Switched LAN scheme performs better when the ring FDDI LAN environment.

HEMT素子의 I-V特性에 대한 解析的 모델링에 관한 硏究

張虎聲,洪淳錫,呂正鉉 홍익대학교 산업기술연구소 1994 産業技術 Vol.3 No.-

In this paper, we solve one-dimensional Poisson's equation the gate-bias dependence of 2DGE variation by charge control mechanisum including the depletion with of GaAs layer. In addition, we derive analytically schroedinger's equation by new qauntum well approximation in order to include the broadening effect of the quantum well in the cut off regime. Proposed, analytical model for Ⅰ-Ⅴ characteristics of a Al Ga As / GaAs HEAT device can be described well the depletion with and conduction band energy level of GaAs. The resulting Ⅰ-Ⅴ characteristics describe quite well the effect of GaAs doping concentration over a wide range of operation.

스포츠센터 관계마케팅 실행요인이 관계품질, 구매행동에 미치는 영향

장호성,석용근 龍仁大學校 體育科學硏究所 2008 體育科學硏究論叢 Vol.17 No.1

The meaning of this research work lies in providing useful basic resources which can be utilized in the strategic respect of internal marketing by investigating how sports center customer in relation to relationship marketing implement factors on relationship quality and purchasing behavior, and by identifying how their service orientation affect business performance taking service quality as parameter. Customer of sports centers in Chungnam region were selected as the subjects of this survey and 248 participants were sampled by Convenience Sampling Method. Resulting data were processed by Frequency Analysis, Exploratory Analysis, Correlation Analysis, Regression Analysis using SPSS 11.0 program. The results from these research methods and analyses revealed the followings: First, results from regression analysis of performance factors of relationship marketing and relations quality revealed that customer-relations orientation, responsiveness and incentive had significant influences on reliability, and that customer-relations orientation and responsiveness, on involvement. Second, results from regression analysis of performance factors of relationship marketing and purchase behavior exhibited that incentive had a significant influence on repurchase intention, and that responsiveness and incentive, on positive word of mouth. Third, results from regression analysis of relationship quality and purchase behavior revealed that there were significant influences of all variables including reliability and involvement on repurchase intention and positive word of mouth.