Treadmill 보행시의 보행속도, 경사도 및 체중에 따른 산소섭취량 예측식에 관한 통계학적 연구

백정민,정규철 중앙대학교 의과대학 의과학연구소 1985 中央醫大誌 Vol.10 No.1

The oxygen uptake in treadmill walking at speeds of 2, 4. 6 and 8 km/hr on the slopes from 0(level) to, 25% of gradient was measured by means of the Douglas bag method on 74 male college students. Correlation coefficients and multiple regression formulae Of VO^2(ml/min) and VO^2/body weight(ml/kg/min) on multivariables such as speed, square of speed, gradient and body weight were calculated. Regression formulae for prediction of the gross oxygen uptake(formulae 1, 3, 4, 5, 6 and 7) in treadmill walking were all highly significant with correlation coefficients ranging from 0.84150 to 0.89227, and standard errors of the estimates ranged from 397.3 ml/min to 475.8 ml/min. Regression formulae for prediction of the oxygen uptake per unit body weight(formulae 2, 8, 9. 10, 11 and 12) were also all significant with correlation coefficients ranging from 0.84201 to 0.90913, and their standard errors of the estimates ranged from 6.6 ml/kg/min to 8.6 ml/kg/min. It was found through regression analysis and means of the differences between the predicted and the actually measured oxygen uptake, that the following two formulae (2) and (3) were the most valid equations for predicting both oxygen uptake per unit body weight and gross oxygen uptake in treadmill walking: VO_2/wt = (0.057G + 0.26) V^2 + 0.5IG + 1.71............(2) VO_2 = 71.6G + 359.6V - 546.1 ........................(3) Standard errors of the estimates and means of the difference between the predicted and the measured by the formula(2) were S.E. = 29.74 ml/kg/min and 0.46 ml/kg/min and S.E. = 258.4 ml/min and = 23.7ml/min by the formulae (3). In predicting the oxygen uptake in treadmill walking, equations expressed as a function of speed or squire of the speed and gradient were all proved to be valid, whether it was gross oxygen uptake or per unit body weight, The mean values of measured oxygen uptake for the Korean male college students were larger than those of the predicted values calculated by the formulae suggested by some foreign researchers. This discrepancies may arise, in part, from the racial difference in aerobic work capacity.

LDPC 부호의 복호를 위한 양자화 성능과 반복 횟수 통계

서영동(Young-Dong Seo),공민한(Min-Han Kong),송문규(Moon-Kyou Song) 대한전자공학회 2008 電子工學會論文誌-TC (Telecommunications) Vol.45 No.-

LDPC 복호기의 성능과 하드웨어 복잡도는 양자화 과정의 설계 변수인 클리핑 임계치(clipping threshold) cth와 양자화 비트 수 q, 그리고 복호과정의 최대 반복 횟수에 의존한다. 본 논문에서는 이상적인 Min-Sum 알고리즘과 양자화된 Min-Sum 알고리즘을 비교하기 위해서 시뮬레이션을 통해 클리핑 임계치 cth와 양자화 비트 수 q에 따른 LDPC 부호의 비트 오율 성능을 평가하였다. 시뮬레이션 결과 클리핑 임계치 cth = 2.5, 양자화 비트 수 q = 6일 경우에 이상적인 Min-Sum 알고리즘에 가장 근접한 비트 오율이 나타남을 확인할 수 있었다. 또한 반복 횟수의 통계적 분석을 통한 반복 횟수의 확률 밀도 함수를 이용하여 q와 반복 횟수에 따른 복호 복잡도를 계산하고, 부호어 에러율(word error rate; WER) 성능을 추정하였다. 이상의 결과는 LDPC 복호기 설계에서 부호의 성능과 복호 복잡도 사이의 절충을 위해 사용될 수 있다. The performance and hardware complexity of LDPC decoders depend on the design parameters of quantization, the clipping threshold cth and the number of quantization bits q, and also on the maximum number of decoding iterations. In this paper, the BER performances of LDPC codes are evaluated according to the clipping threshold cth and the number of quantization bits q through the simulation studies. By comparing the quantized Min-Sum algorithm with the ideal Min-Sum algorithm, it is shown that the quantized case with cth = 2.5 and q = 6 has the best performance, which approaches the idea case. The decoding complexities are calculated and the word error rates (WER) are estimated by using the pdf which is obtained through the statistical analyses on the iteration numbers. These results can be utilized to tradeoff between the decoding performance and the complexity in LDPC decoder design.

6주간의 케틀벨 트레이닝이 남자 배드민턴 동호인의 체력과 배드민턴 기능에 미치는 영향

이규민 ( Lee Kyou-min ),조현석 ( Cho Hyun-seok ),이만균 ( Lee Man-gyoon ) 한국체육학회 2021 한국체육학회지 Vol.60 No.3

이 연구에서는 남자 배드민턴 동호인을 대상으로 6주간의 케틀벨 트레이닝이 체력과 배드민턴 기능에 미치는 영향을 규명하고자 하였다. 트레이닝 집단의 대상자(n=14)는 6주간 주3회, 15∼20분간, 운동자각도 15이상, 최대심박수의 75∼85%로 케틀벨 트레이닝에 참여하였고, 통제 집단의 대상자(n=14)는 동일한 처치 기간 동안 평소 생활습관을 그대로 유지하도록 하였다. 체력 및 배드민턴 기능과 관련된 종속변인을 측정한 후, 반복 이원변량분석을 실시하여 두 집단 간, 그리고 두 검사 간에 비교하여 다음과 같은 결과를 얻었다. 1) 트레이닝 집단의 유연성, 근력, 하지 근지구력, 그리고 스피드가 유의하게 향상되었다. 2) 트레이닝 집단의 스매시 속도가 유의하게 향상되었다. 이를 통하여 6주간의 케틀벨 트레이닝이 남자 배드민턴 동호인의 단시간에 폭발적으로 움직이는 능력과 스매시 속도를 향상시켰다고 결론지을 수 있다. This study was designed to examine the effects of a 6-week kettlebell training on physical fitness and badminton skills in male club members. Subjects in training group (TR: n=14) participated in kettlebell training 15-20 min/session, 3 sessions/week with the intensity of 15 or higher rating of perceived exertion and 75-85% of maximal heart rate for 6 weeks, whereas subjects in control group (CON: n=14) maintained their normal life patterns. Dependent variables related to physical fitness and badminton skills were measured and compared by utilizing repeated two-way ANOVA. Main results of the present study were as follows: 1) Significant improvements in flexibility, strength, muscle endurance of lower body, and speed were shown in the TR. 2) Significant improvements in smash velocity were shown in the TR. It was concluded that physical fitness related to powerful movement and smash velocity were enhanced due to the 6-week kettlebell training in male badminton club members.

가변 LDPC 부호의 성능과 반복횟수 통계

서영동,공민한,송문규,Seo, Young-Dong,Kong, Min-Han,Song, Moon-Kyou 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.1

WiMAX 표준인 IEEE 802.16e의 OFDMA 물리 계층에서는 채널 환경과 다양한 전송 성능의 요구에 부응하기 위해서 다양한 부호율과 부호 길이를 갖는 총 114가지의 가변 LDPC 부호를 정의하고 있다. 본 논문에서는 AWGN 채널에서 Min-Sum 복호 알고리즘을 사용한 시뮬레이션을 통해 부호율 및 부호 길이에 따른 LDPC 부호들의 성능을 평가한다. 부호율은 감소하고 부호의 길이는 증가할수록 우수한 성능을 보임을 확인할 수 있었다. 특히 각각 동일한 부호율에 대해 2가지의 LDPC 부호가 정 의 되 어 있는 2/3과 3/4의 부호율의 경우는 2/3A와 3/4B이 2/3B와 3/4A보다 우수한 성능을 보임을 확인하였다. 또한 반복횟수의 통계적 분석을 통한 반복횟수의 확률밀도함수를 통해 복호 복잡도를 파악하고, WER 성능을 추정하였다. 이상의 결과는 LDPC 복호기의 설계에서 부호의 성능과 복호 복잡도간의 절충을 위해 사용될 수 있다. The OFDMA Physical layer in the WiMAX standard of IEEE 802.16e adopts 114 LDPC codes with various code rates and block sizes as a channel coding scheme to meet varying channel environments and different requirements for transmission performance. In this paper, the performances of the LDPC codes are evaluated according to various code rates and block-lengths throueh simulation studies using min-sum decoding algorithm in AWGN chamois. As the block-length increases and the code rate decreases, the BER performance improves. In the cases with code rates of 2/3 and 3/4, where two different codes ate specified for each code rate, the codes with code rates of 2/3A and 3/4B outperform those of 2/3B and 3/4A, respectively. Through the statistical analyses of the number of decoding iterations the decoding complexity and the word error rates of LDPC codes are estimated. The results can be used to trade-off between the performance and the complexity in designs of LDPC decoders.

시험관내 납 투여가 ICR종 마우스 간 균질액 속의 δ-Aminolevulinate Dehydratase의 생화학적 성상에 미치는 영향

민화식,정규철 중앙대학교 의과대학 의과학연구소 1981 中央醫大誌 Vol.6 No.4

Effects of lead exposure in vitro to δ-aminolevulinate dehydratase (δ-ALAD-1 EC 4.2.1.24) on optimal pH, sensitivity to heat denaturation, stability to storage and freeze-thawing, sulfhydryl nature and Michaelis-Menten constant (Km) and maximal velocity (Vmax) values were studied with the crude enzyme in the supernatant of liver homogenate obtained from ICR strain of mice. Optimal pH for the enzyme activity in the normal and the leaded groups was identical with a value of 6.5. Activity of the enzyme in the normal group steadily decreased as the temperature was raised, whereas in the leaded group, enzyme activity was enhanced at temperature range of 40℃~-50℃ with the highest activity at 45℃, and then decreased. The enzyme could be stored frozen at -30℃ in a deep freezer longer than 3 weeks without significant loss of the activity, but when it was stroed at 4℃ in a refrigerator the activity dropped steadily from the second day of the storage. The enzyme, however, was quite resistant to freeze-thawing. The enzyme was activated maximally by sulfhydryl reagent, β-mercaptoethanol, at a concentration of 100 mM and no activity was demonstrated without addition of β-mercaptoethanol, after DEAE cellulose column chromatography or with addition of iodoacetamide. The enzyme activity was inhibited markedly with addition of lead in vitro with the values of Michaelis-Menten constant (Km) 2.79×10^-4M and maximal velocity (Vmax) 2.33 unit/mg protein.

자외선/과산화수소 고도산화공정에 의한 하수 2차 처리수 중의 용존유기물 분해에 미치는 부유물질과 과산화수소 농도의 영향

안규홍,이석헌,안석,김기팔,정민우,맹승규 대한상하수도학회 2002 상하수도학회지 Vol.16 No.3

Secondary effluent of activated sludge process was treated by UV/H_2O_2 advanced oxidation process to investigate the effect of suspended matter and H_2O_2 concentration. With low dosage of UV radiation, the concentration of the dissolved organic compounds measured as DOC could be increased with and without hydrogen peroxide. It was suggested that the cause of DOC increase in treated samples was the decomposition of suspended microbial particles and the incomplete oxidation of dissolved organic compounds. The removal of suspended solid significantly enhanced the degradation of DOC in both UV and catalyzed UV oxidation. Color and odor of secondary effluent was effectively removed. Turbidity was decreased by oxidation and the particle size distribution was shifted to lower range. With increased H_2O_2 dosage (30∼120mg/l), the removal of DOC was enhanced. To obtain the required quality meeting the regulated level for water reuse, additional treatment for turbidity rejection was required.

원발성 다한증의 교감신경차단술에 대한 임상적 고찰

정민규,이석기,임진수,최형호 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.1

Background : Exccssive sweating of the facial, Palms, axilla and soles, is a psychologically and occupationally distressing and sometimes disabling condition. VideoUassisted thoracoscopic surgery (VATS) is now mostly performed for treating of the facial, palmar and axillary hyperhidorsis. This study was designed to evaluate the results and complication of sympathicotomy of the primary hyperhidrosis. Material and methods : From June 1999 to May 2002, 55 patients ( 30 males and 25 females ) suffering from primary hyperhidirosis were operated. The mean age of patients was 24.0±6.0 years. Bilateral thoracoscopic sympathicotomy was resected the only T2, T2 & T3, onlY T3, T3 & T4 and T2, T3 & T4. The mean follow up period was 18±6.5 months. Results : Mean operation time was 61.2+25.0 minutes and the mean elevation of palmar temperature after sympathicotomy was 1.13±0.2℃. There were no operative deaths but some complication existed : 42 patients (76%) complained the compensatory hyperhidrosis, and 5 patients was developed the postoperative pneumothorax. Sweating decreased in 43% of the planter hyperhidrosis. Conclusion : Most of the patients were satisfied with the postoperative results of the thoracoscopic sympathicotoiny. We conclude that thoracoscopic sympathicotomy is a simple, safe and effective technique in primary hvPcrhidrosis, but satisfaction has been decreased by the compensatory hyperhidrosis; therefore, it is important to thoroughly explain the compensatory sweating. We recommend that the less extent of sympathicotomy decrease the incidence of compensatory hyperhidrosis.

강박장애와 감각추구 성향

이민규,박상학 中央醫學社 1991 中央醫學 Vol.56 No.5

The purpose of this study is to investigate the relationship between obsessive-compulsive symptoms and sensation-seeking tendency. The subjects were administered the Korean version of Leyton Obsessional Inventory and Sensation Seeking Scale in group. In correlation analysis, the symptom subscale score in Leyton Obsessional Inventory was correlated negatively with unconventional sensation seeking tendency. And then, Using the Leyton Obsessional Inventory, two groups were identified: obsessional group and nonobsessional control group. The author used discriminant function analysis to seek the discriminant sensation seeking behavior between the obsession group and nonobsessional control group. The results of the correlation analysis and discriminant function analysis were as follow. 1. Degree of obsessive symptom was negatively correlated with unconventional sensation seeking tendency. 2. In discriminant function analysis, there was no significant difference of general sensation seeking tendency between the obsessional group and nonobsessional control group.. 3. Specific sensation seeking behaviors, significantly discriminate two groups are as follow. 1) gambling for money 2) using four-letter-words 3) preplaned trip 4) respect for lawful authority 5) parachute jumping 6) good night of rest 7) sexual experience before marriage 8) enjoy discussions insulting others 9) uncontrollable emotional experience

다양한 블록 길이를 갖는 적응형 리드솔로몬 복호기의 설계

공민한,송문규 원광대학교 공업기술개발연구소 2003 工業技術開發硏究誌 Vol.23 No.-

In this paper, an adaptive RS decoder using modified Euclid's algorithm has been designed. The implemented decoder allows the values of block length n, message length k hence the error-correcting capability t to be changed in real time at every codeword block. This unique feature is favorable for a shortened Reed-Solomon(RS) codes. A new architecture for a MEA cell suitable for decoding RS codes with variable block length is proposed. The proposed MEA cell uses both the recursive technique and the overclocking technique. An adaptive RS decoder over GF(2^(8)) having the error correcting capability of up to 10 has been designed in VHDL, and successfully synthesized in an FPGA.

광대역 무선 접속을 위한 전송 수렴 부계층 하드웨어 설계

공민한,송문규 원광대학교 공업기술개발연구소 2003 工業技術開發硏究誌 Vol.23 No.-

In this paper, hardware design of a transmission convergence(TC) sublayer for the broadband wireless access(BWA) system based on EEE standard 802.16 is described. The TC sublayer provides interfacing function between a BWA PHY modem and a MAC layer. The TC hardware performs (1) formatting TC PDUs to MAC PDUs, (2) RS encoding/decoding (3) providing various control signals to a PHY modem. The TC hardware controls data traffic according to the DL MAP and UL MAP provided by the base station. The TC hardware for a subscriber station includes back-off algorithm used for collision resolution for the bandwidth request message and the initial raging request message at contention slots. The TC hardwares for a base station and a subscriber station have been designed in VHDL, and successfully synthesized in an FPGA chip.