모래여과에 의한 하수처리 유출수의 인제거 특성에 관한 연구

김환기,이성백,신은섭 全北大學校 附設 都市및環境硏究所 1998 都市 및 環境硏究 Vol.13 No.1

Phosphate remaining in wastewater treatment must be removed for the conservation of water quality in a water system. The concentration of phosphate can be decreased from a physic-chemical method for the discharge water of a sewage disposal plant. In this study, it was performed to examine the adsorptive characteristics of sand filter through batch and column experiments in saturated soil. Batch experiment evaluates the concentration change of phosphate with retention time and column experiment performs to analyze a breakthrough curve for phosphate adsorption. And the batch experiment result of adsorptive equilibrium was fitted for the Langmuir model and the Freundlich model. The results obtained from this study were summarized as follows; 1. In the batch experiment, the adsorptive capacity of PO_4^-3 by sand was below 47% of adsorption rate for retention 24 hours in the range of initial concentration 2.0㎎/ℓ ∼4.6㎎/ℓ. 2. The Langmuir and the Freundlich models on the adsorptive equilibrium were fitted well to both in a good correlation coefficient. 3. In the column experiment, the adsorptive breakthrough curve for input PO_4^-3(15.0㎎/ℓ) occurred to about 30ℓ. And output concentration was almost decided at initial breakthrough curve.

이론적인 선인출 모델

김성백,김한일 濟州大學校工科大學産業技術硏究所 1996 尖端技術硏究所論文集 Vol.7 No.2

Prefetching aims at reducing memory latency by fetching, in advance, data that are likely to be requested by the processor in a near future. The effectiveness of prefetching is determined by how accurate the prediction on the data that will be requested by the processor. Most previous studies on prefetching were limited to proposing a particular prefetch scheme and its performance evaluation. paying little attention to theoretical aspects of prefetching. This paper focuses on the theoretical aspects of instruction prefetching.For this purpose,we propose an ideal prefetching model that makes use of perfect history information. Based on this theoretical model, we analyzed upper limits on the prefetching accuracies of the SPEC benchmarks. The results show that the prefetching accuracy is very high when there is no cache. However. as the size of the instruction cache increases. the prefetching accuracy drops drastically. For example, in the case of the spice benchmark, the prefetching accuracy drops from 53% to 39% when the cache size increases from 2Kbyte to 16Kbyte (assuming 16byte block size). These results indicate that as the cache size increases, most localities are captured by the cache and that instruction prefetching based on the information extracted from the references that missed in the cache suffers from prediction inaccuracies.

주정폐수의 혐기성 소화처리시와 포기처리시 처리특성에 관한 연구

金煥起,李城白,黃譚勇 全北大學校 附設 都市및環境硏究所 1996 都市 및 環境硏究 Vol.11 No.1

The wastewater of alcohol manufactory plant has very high suspended soild and BOD concentration, acidity, and high temperture. Thus most of the plants drive on anaerobic digestion method of biological treatment because of using a lot of generated methane gas and possible to disinfect pathogenic bacteria in sluge and wastewater. But because of the problem in the concentration of anaerobic treatment water, second treatment is necessary 2-step activated treatment for increasing treatment efficiency. The purpose of this study was performed to know a difference between last 1-step digestion 1-step aeration treatment and 2-step digestion 2-step aeration treatment with retention time in digestion and aerator. The obtained results can be summarized as follows; 1. The concentration characteristic of alchohol production wastewater was analyzed COD 50,000∼80,000㎎/ℓ, BOD 22,000∼41,000㎎/ℓ, SS 20,000∼45,000㎎/ℓ, pH 4.1∼4.2, and 75∼80℃ according to the raw material of alchohol. 2. In case of the anaerobic digestion method of rice-barley wastewater, average COD removal rate of 2-step digestion appeared to 91.9% compared to average COD removal rate 59.3% on 1-step digestion. It is necessary to drive above 20 day of retention time in metane degestor because of increasing organic load causing the decrease of pH and the increase of VFA/COD within aerator. 3. Alcohol wastewater of tapioka is generally much treatment efficiency of 2-step digestion than that of 1-step digestion, but below 2.7㎏-COD/㎥·d of COD bulk load showed the possibility of treatment at 1-step and 2-step digestion method. 4. Amount of gas generation in anaerobic digestion was almost similar at 1-step and 2-step digestion. 5. In the result of aerobic treatment, treatment efficiency of 2-step consecutive aeration was highly about 3% compared to 1-step combined aeration and in the condition of COD 4,000㎎/ℓ, COD load 800㎏ -COD/d, COD volume-load 0.8㎏-COD/㎥·d were difficult two treatment methods both. 6. pH and VFA concentrations are considered as important factors to determine VFA restriction and the harmfulness of fatty acid was seemed to be related to pH. VFA in 1-step digestion appeared strong change with the increase of input wastewater quantity, but 2-step digestion was treated to stable change in output COD 1,230∼2,246㎎/ℓ.

製紙슬럿지 소각재의 燒結處理와 溫度의 相關性에 관한 硏究

김환기,이성백,정흥렬 全北大學校 附設 都市및環境硏究所 1995 都市 및 環境硏究 Vol.10 No.1

Paper and pulps industry is improving with development of paper and publication culture, also disposal of paper sludge and flyash has induced significant factor of development in the paper industry because of shortage in disposal area and inhabitant demonstration. There fore this studies persuit fundamentle database of flyash specification in the physical and chemical analysis for recycling architectural materials, etc. 1. This study investigates production of papersludge and flyash chemicalcomposition, physical and chemical specification ( ignition loss, specific weight, sintering temperture. And density etc.) 2. Especially focuses in the characteristics of the sintering treatment and sintering temperature of flyash. 3. Accomplishes in cut of cost through save energy & reuse of waste materials. Environmentally conservation of our nature has to be carried by ourselves.

TDMA 구현 이더네트에 기반한 실시간 RPC 시스템의 설계

이정훈,이봉규,김성백 濟州大學校 基礎科學硏究所 1997 基礎科學硏究 Vol.10 No.1

본 논문은 요청-확인-응답 시맨틱을 갖는 실시간 원격 프로시쥬어 호출을 효율적으로 지원할 수 있는 통신 시스템을 설계하고 그 성능을 평가한다. 이 통신 시스템은 시분할 다중 접근 방식이 구현된 이더네트를 기반으로 하고 있으며 원격 프로시쥬어 호출에 관련된 메시지들을 그들의 특성에 따라 스케쥴하여 서버의 스케쥴과 쉽게 동기화시킨다. 서버와 통신 시스템 스케쥴 동기화에 의해 서버의 수행시간을 효율적으로 사용할 수 있으므로 실시간 원격 프로시쥬어 호출의 종료시한 만족도를 향상시킬 수 있다. 요청의 도착시간, 서비스 시간 및 여유 시간 등 다양한 환경 인자 설정에 의한 모의 실험에 의해 제안된 통신 시스템이 기존의 토큰 버스나 시분할 다중 접근 방식보다 실시간 원격 프로시쥬어 호출의 실시간 성능을 향상시킴을 보인다. This paper proposes and analyzes a communication mechanism capable of supporting real-time RPC(Remote Procedure Call) which is based on request-acknowledgment-reply semantic. As an enhanced protocol of TDMA-implemented Ethernet, the proposed CS(Communication System) dynamically schedules RPC-related messages according to their attributes, making a network schedule be easily combined with a server schedule. As RPC schedule produced by combining server schedule and communication schedule can obviate the waste computation time at the server, more real-time RPC requests can meet their timing constraints. Simulation result shows that the RPC over the proposed CS outperforms those over token bus and TDMA on the various network parameters, such as RPC arrival time, service time and slack.

IT Fusion-based Approaches to Education: Tackling the Problems of Global Education, Constructing Mastery Learning Model, and Creating Competitive-type Learning Games

Seong Baeg Kim 세계환경사회거버넌스학회 2017 World Environment and Island Studies Vol.7 No.2

The Analysis of Prefetch Accuracy Using the Ideal Instruction Prefetch Model

Kim, Seong-Baeg,Lee, Jung-hoon 濟州大學校 師範大學 科學敎育硏究所 1999 科學敎育 Vol.16 No.-

Prefetching aim at reducing memory latency by fetching, in advance, instructions and data that are likely to be requested by the processor in a near future. The effectiveness of prefetching depends on how accurate the prediction on the needed instructions and data is Most previous studies on prefetching were limited to proposing a particular prefetch scheme and evaluating its performance, giving little attention to its theoretical aspects This paper focuses on the limit of instruction prefetching. For this purpose, we propose an ideal model that makes use of a post-morten analysis of a program execution to derive an upper bound on prefetch accuracy. Based on this model, we analyzed the upper bounds on prefetch accuracy (i.e., theoretically achievable prefetch accuracy) of programs from the SPEC benchmarks The results show that when there is no instruction cache the upper bounds are very high. However, as the size of the instruction cache increases, the prefetch accuracy bound drops drastically. For example. in the case of the spice benchmark, the achievable prefetch accuracy drops from 53 % to 39 % when the cache size increases from 2 Kbytes to 16 Kbytes (assuming 16 byte block size). One implication of this result is that when the cache size is over implication of ths some threshold and the prefetch miss penalty is high, instruction prefetching may degrade the overall performance rather than improve it.

난소에 전이된 원발성 간암

김태훈 ( Kim Tae Hun ),정대영 ( Jeong Dae Yeong ),정우백 ( Jeong U Baeg ),손동균 ( Son Dong Gyun ),조돈현 ( Jo Don Hyeon ),정지성 ( Jeong Ji Seong ),김형근 ( Kim Hyeong Geun ),김재광 ( Kim Jae Gwang ),선희식 ( Seon Hui Sig ),강창 대한소화기학회 2004 대한소화기학회지 Vol.43 No.3

Although advances in imaging technology have allowed for earlier detection of disease, hepatocellular carcinoma is usually asymptomatic and discovered at an advanced stage with metastasis. The most common sites of metastasis include lung, peritoneum, adrenal gland, and bone, but rarely, the nasal cavity, orbit, gallbladder, and ovary can be metastatic sites. We experienced a case of metastatic hepatocellular carcinoma of the ovary in a living patient. The differential diagnosis includes hepatoid yolk sac tumor of the ovary, primary or metastatic hepatoid carcinoma and primary or metastatic oxyphil cell tumor of the ovary. To the best of our knowledge, there have been eight cases of metastatic hepatocellular carcinoma of the ovary in the English literature and only six cases discovered in living patients. This is the first report of a metastatic hepatocellular carcinoma of the ovary in Korea. (Korean J Gastroenterol 2004;43:215-218)

난소의 성숙 낭성 기형종에서 발생한 유암종과 저증도 점액성 선암

김민정 ( Kim Min Jeong ),이남희 ( Lee Nam Hui ),최원석 ( Choe Won Seog ),김성욱 ( Kim Seong Ug ),김태영 ( Kim Tae Yeong ),길명도 ( Gil Myeong Do ),백경돈 ( Baeg Gyeong Don ),손현이 ( Son Hyeon I ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.9

Mature cystic teratoma of the ovary is the most common ovarian germ cell tumor and benign, but malignant transformation occurs in less than 2% of benign mature teratoma. Of the malignancies arising in teratomas, squamous cell carcinoma is the most common,

말초형 폐암 환자에 있어서 병기판정을 위한 기관지 내시경검사의 필요성

백승민 ( Baeg Seung Min ),서향은 ( Seo Hyang Eun ),김성규 ( Kim Seong Gyu ),김세환 ( Kim Se Hwan ),김연재 ( Kim Yeon Jae ),이병기 ( Lee Byeong Gi ),김원호 ( Kim Won Ho ),박재용 ( Park Jae Yong ),정태훈 ( Jeong Tae Hun ) 대한결핵 및 호흡기학회 2001 Tuberculosis and Respiratory Diseases Vol.51 No.2