An interface circuit designed for the load cell

Chung, Won Sup 청주대학교 산업과학연구소 2006 産業科學硏究 Vol.23 No.2

저항형 센서 브리지들을 위한 브리지 저항 편차-펄스폭 변환기를 제시한다. 이 변환기는 두 개의 전압-전류 변환기, 두 개의 전류-제어 슈미트 트리거, 하나의 램프 적분기, 그리고 두 개의 로직 게이트로 이루어져 있다. 개별 부품들을 사용하여 제작된 실험회로는 4.68 ms/Ω에 달하는 변환 감도와 ±0.03%보다 적은 선형 오차를 나타냈다. 브리지 저항 편차-펄스폭 변환기를 로드셀에 응용한 예도 제시하였다. A bridge resistance deviation-to-pulse width is presented for interfacing resistive sensor bridges. It consists of two voltage-to-current converters, two current-tunable Schmitt triggers, a ramp integrator, and two logic gates. A prototype circuit built using discrete components exhibits a conversion sensitivity amounting to 4.68 ms/Ω and a linearity error less than ±0.03 %. Its application to a load cell is also presented.

Stator Current Processing –Based Technique for Bearing Damage Detection in Induction Motors

Won ?Pyo Hong,Chung-Sup Yoon,Dong-Hwa Kim 제어로봇시스템학회 2005 제어로봇시스템학회 국제학술대회 논문집 Vol.2005 No.6

새로운 리플 아나로그 : 디지틀 변환기

정원섭(Won-sup Chung) 대한전기학회 1988 대한전기학회 학술대회 논문집 Vol.1988 No.7

용량형 센서를 위한 용량차-시간차 변환기

정원섭,박지만 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.17 No.2

A novel capacitance deviation-to-time interval converter based on ramp-integration is presented. It consists of two current mirrors, two schmitt triggers, and control digital circuits by the upper and lower sides, symmetrically. Total interface circuit has been with discrete components. The results have shown that the cacpacitance deviation has linearily time interval(pulse width). Therefore, the high-resolution can be known by counting the fast and stable clock pulses gated into a counter for time interval. The presented circuit is insensitive to the capacitance difference in disregard of voltage source or temperature deviation. Besides the accuracy, it features the small MOS IC device count integrable onto a small chip area. The circuit is thus particularly suitable for the on-chip, interface.

평생교육 담당자들의 평생교육 개념 이해에 대한 질적 면접 연구

장원섭 한국성인교육학회 2008 Andragogy Today : International Journal of Adult & Vol.11 No.2

이 논문은 평생교육 개념이 실천 현장에서 어떤 의미로 수용되고 있는지를 검토하였다. 4개 지역에서 15개 평생교육기관 실무 담당자들을 질적 면접을 통해 연구한 결과 다음과 같은 점들을 발견하였다. 첫째,평생교육 담당자들에게 평생교육 개념은 생소하고 혼돈스러운 개념이었다. 둘째,평생교육 개념은 어쩔 수 없이 시행하는 의례적인 업무의 개념이었다. 셋째,평생교육 개념은 주민들의 교양과 여가를 위한 복리후생의 개념 이었다. 이러한 연구결과에 대하여 이 연구는 평생교육의 개념적 괴리,실천적 관료성,제도의 협역성 등의 관점에서 논의하였고,항후에도 지속적으로 평생교육의 실천적 맥락을 파악하는 연구가 필요함을 제안하였다. I examined how lifelong education concept was perceived by practitioners in the field of lifelong education. I interviewed 15 practitioners in lifelong education institutions from 4 cities. I found that 1) lifelong education concept was a strange and confusing one; 2) it was an inevitable duty and conventional work: and 3) it was a kind of welfare for quality of residents' culture and leasure. I discussed about these results in the respects of conceptual gaps between formal definition and reality, bureaucratic practices and formalism, and institutional delimitation of the concept. In addition, I suggested the necessity of further studies to explore the lifelong education's practicality and contextuality.

Lidocaine의 산성도가 경막외 마취에 미치는 영향

이원형,신효철,신용섭 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.1

The affective factors on regional anesthesia are lipophilic-hydrophilic balance of local anesthetics, protein binding, hydrogen concentration, structure of intermediate chain, and etc. Local anesthetics in solution exit in a chemical equilibrium between the basic uncharged form(B) and the charged cationic form(BH^+) by Henderson-Hasselbalch equation(PH_a=PK+log[B]/(BH^+)). The increasement of uncharged form brig about rapid onset, good quality, and long duration of anesthesia. Eight patients in group Ⅰ were given 2% lidocaine 21.7ml with 1: 200,000 epinephrine(pH 5.1), and eight patients in group Ⅱ were given 2% lidocaine 20ml with 1: 200,000 epinephrine added NaHCO_3 1.7ml(pH 7.2) to determine the epidural analgesic effect of the pH-adjusted solution. The results are summerized as follow 1. The onsets of analgesia and surgical anesthesia were significantly rapid in group Ⅱ. 2. The levels of analgesia were raised more rapidly in group.

3분과 : 가선집재작업에서의 작업 생산성 및 비용 분석

한원성 ( Won Sung Han ),한한섭 ( Han Sup Han ),김남훈 ( Nam Hun Kim ),차두송 ( Du Song Chu ),조구현 ( Koo Hyun Cho ),민도홍 ( Do Hong Min ),권기철 ( Ki Cheol Kwon ) 한국임학회 2014 한국산림과학회지 Vol.103 No.1

본 연구에서는 임목수확작업에 사용되는 집재기계의 작업효율성을 분석하여 경사가 급한(20° 이상) 작업조건에 적합한 가선계 집재기계를 선정하는데 기초 정보를 제공하고자, 타워야더(RME-300T), 트랙터부착형 집재기(일명: 춘천집재기), 트랙터윈치(FARMI) 등에 의한 집재작업에서의 작업생산성 및 비용을 비교 분석하였다. 평균 흉고직경이 20 cm, 집재거리 60 m, 가로집재거리 10 m, 그리고 기계이용률이 70%인 동일한 작업 조건에서 작업이 이루어질 경우, 타워야더의 1일 집재작업 생산성은 33.04 m3/일, 트랙터부착형 집재기는 38.47 m3/일, 그리고 트랙터윈치는 14.17 m3/일으로 분석되었으며, 이에 따른 집재작업비용은 각각 25,105원/m3, 20,520원/m3, 37,835원/m3으로 나타났다. 동일한 작업조건에서 집재거리에 따른 각 집재기계별 작업효율성을 비교하였을 경우, 집재거리가 40 m 이내로 짧을 경우에는 트랙터윈치에 의한 집재작업이 효율적이며, 40~140 m의 집재거리에서는 춘천집재기가, 140 m 이상의 장거리 집재작업에서는 타워야더가 가장 효율적인 것으로 나타났다. This study was conducted to provide field-based harvesting study information which can be used to select an optimal cable system for certain work conditions on steep grounds (>20° ground slope) in Korea. Toaccomplish this study objectives, we evaluated three cable yarding systems (RME-300T tower-yarder, Chuncheontower-yarder, FARMI tractor winch) working in typical work conditions for their yarding productivity and operational efficiency. Those yarders are commonly used for removing logs or trees on steep grounds in Korea. Under the same work conditions (average DBH of tree to be cut, 20 cm; yarding distance, 60 m; lateral yardingdistance, 10 m; and machine utilization rate, 70%), the average productivities were 33.04 m3/day, 38.47 m3/day, and 14.17 m3/day for RME-300T, Chuncheon tower-yarder, and FARMI, respectively. Our standardized cost comparison study also showed that the yarding cost was highest at 37,835 won/m3 with FARMI, followed byRME-300T at 25,105 won/m3 for the same work conditions. We found the lowest yarding cost with the Chuncheon tower-yarder at 20,520 won/m3 which was resulted primarily from high yarding productivity at theyarding distance (60 m). Our analysis suggested that a small machine such as FARMI could be a low-costyarding machine option for a cable yarding job with a short yarding distance (40 m or less). The Chuncheontower-yarder is well suited for a mid-range yarding distance job in Korea, ranged between 40 to 140 m. Ifyarding distance were longer than 140 m, the RME-300T tower yarder appears to be most cost-effective.

水稻의 分施效果가 稻熱病發生에 미치는 影響

安元燮,李喆浩,崔周鎬 진주산업대학교 1979 論文集 Vol.17 No.-

1978年 우리나라에서 新統一系品種에 大發生한 穗首稻熱病의 發病要因에 대한 問題點을 보완하고 栽培法上의 技術確立을 위하여 品種 및 施肥種類에 따른 稻熱病發生程度와 벼의 生育 및 收量을 調査分析한 바 몇가지 結果를 얻었기에 要約하고져 한다. 1. 草長과 稈長은 無施肥區나 單獨施肥區보다 兼用施肥區 및 完全施肥區에서 길었으며 穗長은 一定한 傾向을 보이지 않았다. 2. 株當粒數는 三期完全施肥區에서 增加되었고 株當穗數는 基肥兼用區에서 많았다. 3. 生體重과 正租重(收量)은 相互 높은 相關을 보였으며 基肥兼用施肥區 및 完全施肥區에서 가장 높았다. 4. 稻熱病은 無肥區에서 거의 發生하지 않았으며 完全施肥區로 갈수록 많았다. There was a epidemic outbreak of disease in rice varieties, especially semi-dwarf varieties (Tongil Type varieties) which were damaged severely by neck blast disease in Korea 1978. Studies on outbreak of riceblast disease in 1978. in respect of cultural practive-methods of fertilizing application for established technical cultivation. The results are as follow; 1. The height per plant and culm length were longest in plot of combinative fertilization included with basal fertilizer. 2. Number of panicles per hill increased in plot of combinative fertilization with basal and number of spikelets per panicle were reduced by non-fertilization but increased in plot of standard fertilization. 3. Highly positive correlations were fond between fresh weight and brown rice(yield) weight in all applied treatments. The yield were highest in plot of combintive fertilization stage with basal fertilizer. 4. In cultural practice, heavy fertilizer application might have cuased the result of neck blast disease.

水稻導入品種의 生産力檢定에 關한 硏究 : 第3報 裁植密度에 關한 生産力 檢定 Ⅲ Productivity trial on planting density

安元燮,金祥哲 진주산업대학교 1969 論文集 Vol.3 No.-

第3表에서 보는 바와 같이 收量(玄米)에 對한 分散分析의 結果는 다음과 같다. 1. 施肥量에 있어서는 有意差가 나타나지 아니하였다 2. 栽植密度間에는 5%의 有意性이 認定되었다. 3. 普通肥보다 1.5倍肥가 玄米收量 指數는 높으나, 1.5倍肥區는 成熟期에 倒伏이 容易하므로 施肥量은 普通肥가 適當하다고 思料된다. 4. 栽植密度는 施肥量과 關係없이 120株가 가장 높은 比率을 나타내고 있음. 5. 施肥량이 많을수록 紋枯病 發生이 많다. 6. 本品種은 普通肥로서 少株密植이나 多株疏植이 가장 適當하다고 생각된다. These experiments were conducted to investigate the reaction of nitrogenous fertilizer and the rate of transplanting for newly introduced rice varieties, Calady 40. The rate of transplanting were 72, 90, 108, 120 and 144 hills per pyong(3.306㎡) and the quantities of nitrogenous fertilizer were 10.5 and 15.5 kgs per acre. The results are summarized as follows. 1. There was not any significant in the quantity of nitrogenous fertilizer applycation, but at the 5% lavel the rate of transplantings 2. The yield of unpolished rice was higher at more quantity of nitrogenous fertilizer application, but loading and sheath blight were severely 3. In the rate of transplanting, 120 hills per pyong was the best. From the results, it is can be recognized that Calady40 could be a profitable to be cultured under standards nitrogenous fertilizer level and few seeding dense planting or many seedling estranged planting.

回轉圓板에 依한 窒酸化에 關한 硏究

諸元穆,鄭渭得,金冕燮 漢陽大學校 環境科學硏究所 1989 環境科學論文集 Vol.10 No.-

回轉圓板을 利用하여 COD除去와 室酸化를 同時에 效率的으로 達成하기 위하여 일련의 實驗을 行하였다. 回轉圓板에서 박리시킨 Sludge를 현탁 狀態에서 利用하여 室酸化에 미치는 pH의 影響을 檢討하였으며, 最適 pH값은 7.5∼8.5이었다. 많은 量의 酸素供給에 依해서도 室酸化는 增加되지 않았으며, 그 까닭은 놓은 COD負荷條件下에서 COD를 利用하는 微生物君에 依해 두꺼워진 生物膜이 室酸化에 必要한 酸素와 基質移動을 制限한 때문인 것으로 推定되었다. 回轉圓板을 利用한 室酸化를 爲해서는 COD負荷는 0.027㎎/㎝²·hr以下로 制限되어야 하고, 또 높은 COD와 無機室素를 合有하는 廢水의 處理에는 多段 System이 適用되어야 한다는 것을 알 수 있었다. Rotating biological disc contactor system was used in order to accomplish the COD removal and nitrification simultaneously in one step. The effect of pH on nitrification rate was examined in a suspended growth system, using microorganism scraped from the rotating discs, and an optimum pH value was between 7.5 and 8.5. Nitrification was not accompanied by a large amount of dissolved oxygen supplied in the system. This might be attributed to the inreased thickness of the COD-utilizer-biofilm limited oxygen and substrate transfer for nitrification under high COD loading. It was found that the COD loading must be reduced to below 0.027㎎/㎝²·hr, for nitrification to occur in the rotating disc system, and that a multi-stage system could improve the treatment of waste water containing both high COD and inorganic nitrogen.