무정전 전원공급장치용 온라인 배터리 관리시스템 개발

남종하(Jong-ha Nam),최진홍(Jin-Hong Choi),김승종(Seung-Jong Kim),김재웅(Jae-Woong Kim) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-

UPS 시스템에서 정전시 안정적인 전력공급을 방해하는 요소의 대부분은 배터리의 불량이 차지하고 있다. 일반적으로 UPS 시스템에 적용되는 배터리는 일정시간이 경과되면 전체를 교체하는 관리시스템을 가지며, 주기적인 방전시험을 실시하지만 교체기준에 대한 명확한 방안이 마련되어 있지 않다. 일부에서는 배터리의 내부저항 혹은 임피던스를 측정하여 배터리의 교체여부를 판단하는 기준으로 삼고 있지만 배터리의 비선형적 특성으로 인하여 그 오차범위는 크다고 할 수 있다. 또한 배터리는 부동충전시에는 정상적인 특성을 보이지만 방전시 불량특성이 나타나는 경우가 많고, 리튬-이온 배터리의 경우 내부저항은 수십[mΩ]의 비교적 큰 값을 가지지만 UPS에 적용되는 납축전지의 경우 수[mΩ] 정도의 아주 낮은 내부저항을 가져 측정오차에 의해 불량 여부를 명확히 판단하지 못하는 경우가 있다. 본 논문에서는 이러한 문제점에 착안하여 평상시에는 배터리의 개별셀 전압, 온도, 전체전압 및 보관함의 온도, 충방전 전류, SOC(State of Charge)를 현장 및 원격지의 모니터링 PC로 전송하여 사용자에게 보여주며, 정전으로 인한 방전시에는 내부저항과 개별셀의 용량을 계산하고 이를 통해 교체시기를 결정할 수 있도록 구성되어 있으며, 실험을 통해 타당성을 확인하였다.

ATM 망 접속 카드의 설계

김남종(Nam Jong Kim),강태운(TaeWoon Kang),남지승(JiSeung Nam) 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.6

지하수 자원 개발을 위한 GIS 응용 연구

김윤종 ( Youn Jong Kim ),조민조 ( Min Joe Cho ),성익환 ( Ig Hwan Sung ),김남종 ( Nam Jong Kim ),최영진 ( Young Jin Choi ),김규범 ( Gyu Bum Kim ) 대한지질공학회 1993 지질공학 Vol.3 No.2

초음속 노즐에서 발생하는 유동 이력현상에 관한 연구

남종순(Jong Soon Nam),이종성(Jong Sung Lee),김회동(Heuy Dong Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10

Hysteresis phenomena in fluid flow system have the attention of many researchers for their industrial and engineering applications. However, the hysteresis phenomena in the supersonic internal flow with shock wave have not been investigated compared to those in the supersonic external flow with shock wave satisfactorily. The present work aims at investigating the unsteady behavior of shock position with a three types of two-dimensional supersonic nozzle using CFD. The present computational results were validated with previous experimental data. Unsteady, compressible, axisymmetric, Navier-Stocks equations with Spalart-Allmaras one-equation turbulence model were solved using a fully implicit finite volume scheme. The result obtained with relationship of between the nozzle area expand ratio and hysteresis phenomenon were discussed.

신우와 요관에 생긴 종양에서 예후 및 예후인자

남종길(Jong Kil Nam),정석근(Suk Gun Jung),김태남(Tae Nam Kim),박성우(Sung Woo Park),정문기(Moon Kee Chung) 대한비뇨기종양학회 2011 대한비뇨기종양학회지 Vol.9 No.1

Purpose: We evaluated lymphovascular invasion (LVI) as a prognostic factor and the outcome in patients with transitional cell carcinoma of the upper urinary tract. Materials and Methods: Between 1996 and 2009, we retrospectively reviewed the series of 136 patients who underwent nephroureterectomy with bladder cuff resection for transitional cell carcinoma of the upper urinary tract. Among 136 patients, those who had distant metastasis (2 patients), concomitant invasive bladder cancer (20 patients), incomplete resection or positive surgical margin (12 patinets) and follow up loss or unavailable data (n=18) were excluded in this study. 84 patients were selected to evaluate the 5 year survival rate and 5 year disease free rate by using log rank test of Kaplan-Meier according to the factor of the lymphovascular invasion. We evaluated the prognostic factors by using Cox regression. The prognostic factors were age, Sex, T stage, N stage, grade, location of the cancer (pelvis and ureter) and lymphovascular invasion. Results: The mean age of the patients when the operation performed was 66.6 year-old and the mean period of follow-up study was 42.2 months (7-161 months). Male patients are 56 and female patients were 28. The Ta/T1 and T2-4 stage was 40 and 44. The N0 and N1-3 were 72 and 12. The grade I-II and III were 45 and 39. Cancer in pelvis and ureter were 29 and 54. 24 patients were diagnosed with LVI. The 5 year survival rate in LVI positive and negative were 59% and 84.5% (p=0.014), and the 5 year disease free rate were 28.4% and 74.3% (p=0.004), respectively. T stage, N stage and LVI were significant prognostic factors in 5 year survival rate and 5 year disease free rate. However, tumor location was not an independent predictor for recurrence, and there was no difference in the probability of disease recurrence between ureteral and renal pelvic tumor. Conclusions: LVI regarded as a prognostic factor in 30% of patients of transitional cell carcinoma in upper urinary tract and could be independent prognostic factor of disease free rate and survival rate.

주암호유역 산림기원 비점오염원물질과 주암호에 서식하는 조류번식간의 상관성 규명

김남종,신대윤,Kim, Nam-Jong,Shin, Dae-Yewn 대한환경위생공학회 2006 대한환경위생공학회지 Vol.21 No.4

In Juam basin, the ratio of non-point pollution source among pollutant loading of basin was significantly high, since the utilization level of land was high. In addition, the most pollutants were not treated and flowed out. In this study, the correlation between non-point source pollutants from the forest area and increasing algae was investigated. 1. Chl-a concentration flowed out to runoff from forest area and stream water was low as $0.1{\sim}20.3{\mu}g/{\ell}$ and $0.1{\sim}9.3{\mu}g/{\ell}$, respectively, and chl-a concentration ($0.1{\sim}28.5{\mu}g/{\ell}$) of branch stream was higher $5{\sim}7$ times than that of runoff from forest area. 2. In correlation between runoff from forest area and Juam lake water, annual chl-a concentration of area front Juam dam was higher twice than forest area. 3. In runoff from forest area within Juam basin, flagellate, green, diatom and blue algae occupied $33.0{\sim}41.7%$, $22.2{\sim}30.8%$, $17.3{\sim}22.5%$ and $13.7{\sim}17.6%$, respectively. 4. In runoff from forest area, both green and diatom algae were maintained constantly irrespectively of season, and flagellate algae dominated since August. 5. In characteristics by forest tree types, four types algae were inhabited in mixed forest, and flagellate algae were higher in conifer and broadleaf forest than in other area. And green algae in herbaceous forest were higher than other area.

지하수 이용량 추정기법 개발

우남칠 ( Nam Chil Woo ),조민조 ( Min Joe Cho ),김남종 ( Nam Jong Kim ) 대한지질공학회 1994 지질공학 Vol.4 No.3

초등학교 스포츠강사의 교사직무만족도와 교사효능감에 관한 연구

이용현(Young-Hyun Lee),김남종(Nam-Jong Kim),김성택(Seong-Taek Kim) 한국운동재활복지협회 2022 운동재활·복지 Vol.3 No.2

목적 : 이 연구는 초등학교 스포츠강사의 직무만족도와 교사효능감을 분석하여 업무환경의 개선과 스포츠 강사의 질적 향상으로 효율적인 운영을 위한 기초자로는 제시하는데 있다. 방법 : 모 소재지의 초등학교 스포츠강사 300명을 대상으로 설문지를 통해 진행되었다. 최종적으로 234부의 설문지가 채택되었으며, 교사 직무만족과 교사효능감 설문지가 사용되었다. 수집된 자료는 통계프로그램 SPSS 20..K를 통해 인구학적 변인에 대한 t-검정과 직무만족도와 교사효능감에 대한 상관관계분석을 진행하였다. 모든 통계적 유의 수준은 .05로 설정하였다. 결과 : 성별에 따른 차이는 직무만족도의 하위변인 중 동료관계와 교사효능감의 하위요인 자기조절효능감에서 남성이 여성보다 높은 것으로 나타났다. 교원자격증 유무에 대한 결과는 직무만족도의 동료관계와 자율성에서 차이를 보였고, 교사효능감에서는 유의한 차이가 나타나지 않았다. 또한 직무만족도와 교사효능감은 정적 상관관계를 나타냈다. 결론 : 초등 교과 과정에서 아이들의 스포츠 활동에 대한 중요성이 점차 강조되고 있으며, 스포츠강사의 역할 또한 중요해지고 있다. 이에 다양한 심리적 분석을 통해 스포츠강사의 업무환경 개선과 질적 향상으로 보다 수준 높은 교육이 이루어질 수 있다. 또한 스포츠 강사의 효율적인 교직 운영을 위한 자료로 활용될 것으로 기대한다. Purpose: This study analyzed the job satisfaction and effectiveness of elementary school sports instructors, and presented the basis for improving the working environment and improving the quality of sports instructors for efficient management. Methods: A questionnaire was given to 300 elementary school sports instructors in a certain location. Ultimately, 234 questionnaires were adopted, using teacher job satisfaction and teacher effectiveness questionnaires. Collected data were analyzed via the statistical program SPSS 20..K with t-tests and job satisfaction and teacher effectiveness We proceeded with the correlation analysis for All statistical significance levels were set at .05. Results: Among the subvariables of job satisfaction, males were found to be higher than females in subfactor self-regulatory efficacy of co-worker relationship and teacher effectiveness. Regarding the results for the presence or absence of a teacher's certificate, there was a difference in job satisfaction in colleague relationship and autonomy, but no significant difference in teachers' sense of effectiveness. There was also a static correlation between job satisfaction and teacher effectiveness. Conclusion: The importance of children's sports activities is being emphasized more and more in elementary school classes, and the role of sports teachers is becoming more important. Diverse psychological analysis can improve the work environment and quality of sports instructors, enabling higher-level education. It is also hoped that it will be used as a resource for effective management of the teaching profession of sports instructors.

제주도 지하수자원의 최적 개발가능량

한정상,한규상,김창길,김남종,한찬,Hahn, Jeong-Sang,Hahn, Kyu-Sang,Kim, Chang-Kil,Kim, Nam-Jong,Hahn, Chan 한국지하수토양환경학회 1994 지하수환경 Vol.1 No.1

제주도 지하수자원의 산출특성을 규명키 위하여 총 455개 기존관정의 자료를 전산처리하여 지역별 대수성 수리특성을 규명하였다. 제주도는 주로 현무암내에 협재된 화산쇄설층, crinker층과 현무암의 1 및 2차 유효공극이 주 대수대의 역할을 하며 이들은 기저, 준기저 및 상위대수층으로 구성되어 있다. 본도 대수층의 평균 투수량계수는 29,300 $m^2$/일이며 평 균 저유계수는 0.12로써 자유면 대수층을 이루고 있다. 종합적인 물수지 분석을 실시한 바 본도에 부존된 지하수 부존량은 약 440억 ㎥이고, 년평균 강수량은 33.9억 ㎥으로써 이 중 하천유출량은 6.38억㎥/년이며, 증발산량은 12.56억 ㎥/년(37%)이고 지하수함양량은 년평균 강수량의 44.1%에 해당하는 14.94억㎥이다. 본도에 부존된 지하수의 최적 개발가능량(sustainable yield) 을 각 지역별로 정량적으로 계산한 결과 그 양은 함양량의 41%에 해당하는 6.2억㎥/년(1,689,000 ㎥/일) 정도였으며 잔여 8.74억㎥/년(2,404,000㎥/일)은 해안이나 해저용천의 형태로 유출된다. 특히 최근에 실시한 심부 시추조사 자료에 의하면 EL-120$\pm$68m 부근에 저투수성 해성 퇴적층(일명 세화리층)이 분포되어 있는 것으로 판명되었으며 과거 서귀포층군으로 알려진 저투수성 퇴적층이 북서부와 서부 일원에서 EL-70m 부근에 널리 분포되어 있어 서귀포층군과 세화리층의 명확한 구분이 필요하다. 만일 이러한 저투수성 퇴적층이 제주도의 기저층을 이루는 경우 제주도 내에 부존된 지하수는 주로 준기저 지하수일 것이며 이는 제주도 지하수의 산출특성에 결정적인 영향을 미칠 것이다. The Hydrogeologic data of 455 water wells comprising geologic log and aquifer test were analyzed to determine hydrogeologic characteristics of the Cheju island. The groundwater. of the Cheju island is occurred in unconsolidated pyroclastic deposits and crinker interbedded in highly jointed basaltic and andesic rocks as high level, basal and parabasal types under unconfined condition. The average transmissivity and specific yield of the aquifer are at about 29,300㎡/day and 0.12 respectively, The total storage of groundwater is estimated about 44 billion cubic meters. Average annual precipitation is about 3,390 million ㎥ among which average recharge is estimated for 1,494 million ㎥ being equivalent 44.1% of total annual precipitation with 638 million ㎥ of runoff and 1,256 million ㎥ of evapotranspiration. Based on groundwater budget analysis, the sustainable yield is about 620 million ㎥(41% of annual recharge)and rest is discharging into the sea. The geologic logs of recently drilled thermal water wells indicate that very low-permeable marine sediments(Sehwa-ri formation) composed of loosely cemented sandy silt derived from mainly volcanic ashes at the 1st stage volcanic activity of the area is situated at the 120${\pm}$68m below sea level. Another low-permeable sedimentary rock called Seogipo-formation which is deemed younger than the former marine sediment is occured at the area covering north-west and western part of the Cheju island at the ${\pm}$70m below sea level. If these impermeable beds art distributed as a basal formation of fresh water zone of the Cheju island, the most of groundwater in the Cheju island will be para-basal type. These formations will be one of the most important hydrogeologic boundary and groundwater occurences in the area.

여고생의 건강체력 평가기준 설정

정도상(Jeong Do-Sang),김남종(Kim Nam-Jong) 한국체육과학회 2003 한국체육과학회지 Vol.12 No.2

The purpose of this study was to investigate physical fitness and to construct a test battery for evaluating health-related physical fitness in high school girls. The subjects were 369 high school girls aged 15 to 17. Ten test items were used in assessing health-related physical fitness. Principal factor analysis was applied to the correlation matrix consisting of 10 variables. Then, the first principal component was investigated. This factor correlated with most of variables at significant level and this factor had the amount of contribution to the total variance of 2.313, the degree of contribution of 23.13%. The first factor was interpreted as a fundamental physical fitness factor(FPFF). Multiple regression analysis was used in developing prediction equations for health-related physical fitness(HRPF). The multiple correlation between FPFF and 5 HRPF variables was significant(R=0.838, p<.05). The following equation for estimating health-related physical fitness score(HRPFS) was developed; HRPFS = 75.228+1.624X₁+0.337X₂-0.253X₃+0.397X₄-0.656X?, where in X₁= grip strength, X₂=sit and reach, X₃=800m run, X₄=sit ups, X?=%fat. The assessment criterion ranking by a 5-point scale in each was constructed using a regression equation to ages.