한국(韓國)의 수질기준(水質基準)(환경(環境))

심재환 한국농공학회 1980 韓國農工學會誌 : 전원과 자원 Vol.22 No.3

한국산 칠성장어 속 ( 칠성장어과 )의 계통분류학적 연구

심재환 한국어류학회 1992 韓國魚類學會誌 Vol.4 No.2

대호(大湖)의 수질변화에 관한 연구

심재환,박근조,김원기 한국환경농학회 1988 한국환경농학회지 Vol.7 No.2

大湖 防潮堤 築造 後 淡水湖의 水質을 調査하여 염농도 및 일반수질변화가 관개용수원에 미치는 영향을 糾明하고자 '84年 에서 '88年 5月 까지의 調査結果를 要約하면 다음과 같다. 1. 大湖 淡水湖의 水溫分布는 암거탄구 設置地點인 -14m 상부에는 季節變化에 따른 氣溫의 영향으로 變化(6-25℃)가 많았으며, 암거탄구 이하에서는 11.9℃로 年中 變化가 없었다. 2. 防潮堤 앞 제일 깊은곳의 年度別 수질변화는 pH7.6 ECl6,800-1,472μm hos/㎝, DO 9.2-10.8ppm, BOD 1.3-2.5ppm, COD 2.4-5.3ppm, T-N 0.22-2.29pp, T-P는 0.01-0.10ppm을 나타내었다. 3. 大湖 淡水層의 평균 수질성적('88년)은 pH 7.6, EC1,745um hos/㎝, DO 10.8ppm, BOD 1.8pp, COD 2.4pp, T-N 0.52ppm, T-P 0.05ppm으로 全 地點에서 비슷한 傾向이었다. 4. 淡水層(6m)에서의 鹽度變化는 締切 前 29,000ppm에서 '84年 3月 11,000ppm '85年 3月 4,300ppm,'86年, '87年 3月에는 2,000ppm, '88년 3月에는 900ppm 까지 낮아졌다. 湖內 平均 鹽度 29,000ppm 정도에 서 '88年 3月 1,200ppm 까지 낮아졌다. 또한 암거탄구 상부의 평균염도('87年)는 1,300ppm 정도였으며, 탄구아래는 海水와 같은 30,000ppm정도였다. 5. 淡水層에서 가장 높은 염도를 나타낸 地點은 防潮堤 앞 부근이며,'84年에는 5,835ppm 이었다. 6. 調査時期別 鹽度變化는 갈수기인 '87年 5月 2,000ppm에서 홍수기 후 8月 800ppm, 풍수기인 9月에는 485ppm까지 낮아졌다. 7. 鹽分躍層 깊이는 암거탄구 地點인 -l4m까지 維持되어 淡水湖化가 進行되었다. 그러므로 大湖 淡水層의 수질은 農業用水源으로는 큰 문제가 없으며, 삽교호로부터 除鹽用水의 供給도 불필요할 것으로 사료된다. This study was designed to find out whether the water quality of Lake Daeho would be suitable for Sgricultural purposes during 1984-1988 perird. Thr results were as follows ; 1. There was an apparent seasonal temperature fluctuation(6-25℃) above the entrance of the culvert at the depth of 14m, but the temperature below remained constant at 11,9℃. 2. The yearly water qualities observed at the deepest site by the seadike were 7.4-7.5 pH, 16,800-1,472 umhos/cm EC, 9.2-10.8ppm DO, 1.3-2.5ppm DOD, 2.4-5.3ppm COD. 0.22-2.29ppm T-N, 0.01-0.l0ppm T-P. 3. The average values of water qualities at the epilimnion in 1988 were 7.6 pH, 1,745umhos/cm EC, 10.8ppm DO, 1.8ppm DOD, 2.4ppm COD, 0.52ppm T-N, 0.05ppm T-P. 4. The salinity of the epilimnion at a 6m depth was 29,000ppm before the final closure of the seadike. It was 11,000 ppm in March 1984, 4,300ppm in March 1985, 2,000ppm in March 1986 and 1987, and 900ppm in March 1988. The salinity of the whole water column decreased from 29.000ppm to 1,200 ppm in March 1988. The average salinity above and below the culvert in 1987 was about 1,300ppm, and 30,000ppm respectively reaching that of seawater. 5. The highest salinity was observed at the epilimnion by the seadike, showing about 5,835ppm in 1984. 6. The seasonal salinity fluctuation was 2,000ppm in May, 800ppm in October, and 485ppm in September 1987. 7. The halocline was observed at the depth of 14m where the entrance of the culvert was located. Therefore, the epilimnion water is suitable for agricultural purposes, and the intake of water from Lake Sapkyo seems to be unnecessary.

Fabrication of NOA microfluidic devices based on sequential replica molding

심재환,문현준,노윤호,정현욱,봉기완 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5

Polydimethylsiloxane (PDMS) microfluidic devices, though they are commonly utilized in microfluidic applications, have several limitations, such as short-term modified surface condition, swelling in the presence of organic solvents, and deformation under high pressure or when built with low aspect ratios. To resolve the restrictions, Norland Optical Adhesive (NOA) has been introduced as an excellent alternative for PDMS. Here, we present a practical protocol for the fabrication of NOA microfluidic devices via a step-wise molding process. Through the indirect molding of NOA on wafers, the damage to the wafers can be significantly reduced. Furthermore, because we use positivepatterned wafers, which are commonly used to fabricate PDMS devices, no additional fabrication of the wafer is required. This simple strategy thus avoids damage to the wafers and simultaneously allows for the mass production of NOA devices without deformation. We also test the performance of NOA devices in oil-in-water droplet production and in a microfluidic process using organic solvents.

WUSB 홈네트워크에서의 충돌회피를 위한 MAC설계

심재환,Sim, Jae-Hwan 한국전자통신학회 2013 한국전자통신학회 논문지 Vol.8 No.1

The USB-IF has specified a Wireless USB (WUSB) protocol based on UWB for high speed wireless home networks and WPANs. In this paper, firstly, performance degradation due to the Private Distributed Reservation Protocol (DRP) conflict problem caused by devices' mobility is analyzed. And a novel relay transmission protocol combined with Private DRP conflict resolution is proposed to overcome the performance degradation at Private DRP conflicts. In order to give the loser device due to Private DRP conflicts another chance to maintain resources, the proposed relay transmission protocol executed at each device helps the loser device reserve another indirect link maintaining the required resources via a relay node. 본 논문에서는 UWB 기술 기반 무선 USB(WUSB) 프로토콜에서, 디바이스들의 이동성으로 인해 발생하는 Private Distributed Reservation Protocol (DRP) 예약 충돌 현상을 분석한다. 그리고 Private DRP 예약 충돌시 발생하는 성능 저하를 감소시키기 위해 Private DRP 릴레이 통신 기술을 제안한다. 본 논문에서 제안하는 Private DRP 릴레이 통신 프로토콜은 충돌대상 디바이스에게 예약된 자원을 유지할 수 있도록 Direct Link 뿐만 아니라, Private DRP 예약 충돌 시 릴레이 노드를 경유하여 또 다른 Indirect Link 링크를 빠르게 예약할 수 있는 분산적인 자원 예약 프로토콜을 제안한다.

풍암저수지의 어류상

심재환 서강정보대학 2002 論文集 Vol.21 No.-

I surveyed the fishfauna of the Poong-am reservoir, Gwangju, from April to October, 2002. The collected fishes were 7 species Cyprinus carpio, Carassius auratus, Pseudorasbora parva, Misgrunus anguillicaudatus, Channa arga, Lepomis macrochirus and Micropterus salmides. The dominant species was Lepomis macrochirus, and revealed the 58.2% of relative abundance. And the two species Lepomis macrochirus and Micropterus salmides were exotic fish species.

Synthesis and Characterization of Nanoporous Ultralow-Dielectric Films by Grafted and Dual- Porogen Methods

심재환,노현욱,박지혜,박은수,이희우,David W. Gidely,윤도영 한국고분자학회 2006 한국고분자학회 학술대회 연구논문 초록집 Vol.2006 No.4

한국의 수질기준(환경)

심재환 한국농공학회 1980 한국농공학회논문집 Vol.22 No.3

전류모드 CMOS를 사용한 병렬 3치 승산기 설계

심재환,변기영,윤병희,이상목,김흥수,Sim, Jae-Hwan,Byeon, Gi-Yeong,Yun, Byeong-Hui,Lee, Sang-Mok,Kim, Heung-Su 대한전자공학회 2002 電子工學會論文誌-SC (System and control) Vol.39 No.2

본 논문에서는 전류모드 CMOS를 통한 GF(3/sup m/)상의 표준기저 승산회로를 제안하였다. 먼저, GF(3)연산을 위해 필요한 가산 및 승산을 진리표를 통해 정의하고 이를 CMOS회로로 설계하였다. GF(3/sup m/)상의 임의의 두 원소들간의 승산의 전개방식을 수식을 통해 보였으며, 정의된 3치 기본연산자를 조합하여 GF(3/sup m/) 승산회로를 설계하였다. 제안된 수식과 회로를 m에 대하여 일반화하였고, 그 중 m=3에 대한 설계의 예를 보였다. 본 논문에서 제안된 승산회로는 그 구성이 블록의 형태로 이루어지므로 m에 대한 확장이 용이하며, VLSI에 유리하다. 또한 회로내부에 메모리소자를 사용하지 않고, 연산디지트들이 병렬로 연산되므로 빠른 연산이 가능하다. 제안된 회로의 논리연산동작을 시뮬레이션을 통해 검증하였다. In this paper, a new standard basis parallel ternary-valued multiplier circuit designed using current mode CMOS is presented. Prior to constructing the GF(3$^{m}$) multiplier circuit, we provide a GF(3) adder and a GF(3) multiplier with truth tables and symbolize them, and also design them using current mode CMOS circuit. Using the basic ternary operation concept, a ternary adder and a multiplier, we develop the equations to multiply arbitrary two elements over GF(3$^{m}$). Following these equations, we can design a multiplier generalized to GF(3$^{m}$). For the proposed circuit in this paper, we show the example in GF(3$^{3}$). In this paper, we assemble the operation blocks into a complete GF(3$^{m}$) multiplier. Therefore the proposed circuit is easy to generalize for m and advantageous for VLSI. Also, it need no memory element and the latency not less fewer than other circuit. We verify the proposed circuit by functional simulation and show its result.

Synthesis and Characterization of Organosilicate Polymer E-Beam Resists

심재환,이성일,남성욱,김기범,윤도영 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.1