슬랩의 균열도 향상과 연료 절감을 위한 직접가열식 가열로 내 온도 분포의 최적 설계

정의수(Eui-soo Jeong),심성민(Sung-Min Shim),김영득(Young-Deuk Kim),강덕홍(Deok-Hong Kang),김우승(Woo-Seung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

Since the reheating furnace consumes a large amount of energy to heat up the slabs, it is very important to find an optimal temperature patterns in the furnace for energy saving as well as uniform target temperature at the exit of the furnace. In this study, the temperature profiles in the slab are determined by solving the transient two-dimensional heat conduction equation in conjunction with boundary conditions with total heat exchange factors. The design of optimal temperature patterns is performed by using three optimization algorithms, which consist of a micro genetic algorithm (μ-GA), conjugated gradient method (CGM) and sequential linear programming (SLP), to identify the optimal results obtained from each algorithm. It can be seen that the consistent optimal results for each optimization algorithm are produced with the uniform target temperature of the slab and energy saving.

직접 가열식 가열로 내 최적 분위기온도 분포 해석에 관한 연구

정의수(Eui-soo Jeong),심성민(Sung-Min Shim),김영득(Young-Deuk Kim),강덕홍(Deok-Hong Kang),김우승(Woo-Seung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

Because the reheating furnace consumes a large amount of energy to heat up the slabs, it is very important to find an optimal temperature patterns in the furnace for energy saving as well as uniform target temperature at the exit of the furnace. In this study, the temperature profiles in the slab are determined by solving the transient one-dimensional heat conduction equation in conjunction with boundary conditions with total heat exchange factors. The optimal temperature patterns are obtained to minimize the fuel consumption with satisfying the predetermined constraint conditions. The design optimization is performed by using a genetic algorithm and the optimal results are validated with results obtained from the PIDO tool, called as P.I.A.n.O.

방재시설의 성능위주설계 요소의 사례연구

김수연(Soo-Yeon Kim),김연규(Yeon-Kyu Kim),서윤정(Yoon-Jeong Seo),정의수(Eui-Soo Chung) 한국가스학회 2012 한국가스학회 학술대회논문집 Vol.2012 No.5

돼지분뇨슬러리의 액비조내 저장깊이별 고형물 및 질소, 인의 함량분포에 관한 연구

정광화,정의수,박치호,곽정훈,최동윤,유용희,Jeong, Kwang-Hwa,Chung, Eui-Soo,Park, Chi-Ho,Kwag, Jung-Hoon,Choi, Dong-Yoon,Yoo, Yong-Hee 한국축산환경학회 2006 축산시설환경학회지 Vol.12 No.3

본 연구는 돼지분뇨 슬러리의 액비화시 저장깊이(매 30m 깊이별)에 따른 액비의 수직 적층형 단면을 구분하여 각 단면별로 유기물 및 질소와 인의 농도변화 및 고형물의 분포 형태를 분석하여 액비의 수직 단면별 특성을 구명하고자 수행되었으며 주요 결과는 다음과 같다. 1. 침전깊이가 깊어짐에 따라 총고형물 농도는 증가하는 경향을 보인 반면에 총고형물중에 함유된 용해성 물질은 감소하였다. 2. 침전깊이별 오염물 농도는 깊이에 따라 증가하여 저장조 전체깊이 대비 약 70% 정도 내외에서 급격하게 증가하는 경향을 보였다. 3. 총질소와 총인 역시 침전깊이가 깊어짐에 따라 증가하는 결과를 보였는데, 이러한 경향은 총 인의 경우에 있어 더 뚜렷했고 질소의 농도변화는 상대적으로 적었다. 4. 저장 깊이가 깊어짐에 따라 Cr과 Ni 등의 함량도 증가하는 경향을 보였고 그 증가 경향치는 SS의 농도변화와 유사하였다. This paper describes the changes of characteristics of pig slurry according to storing depth. Most of the substances containing pollutants, such as were Management of manure and wastewater from animal confinement facilities is a critical factor for pollution control. With proper treatment processing method in both solid and liquid forms, it can be used as a fertilizer and soil conditioner. In Korea, liquid-manure handling system is very popular because its treatment and application is easy and labor saving. In the storage tank treatment, the period of fermentation process and solids-liquid separation averages six months and the supernatant liquid is being used as a fertilizer. In this study, the changes in chemical characteristics of pig slurry at varying depths of the storage tank were investigated. Results showed that the pH value of the fermented pig slurry was > 7, while the major pollutants such as BOD, SS, N and P were highest in the bottom of the tank. Therefore, the above findings proved that varying depths in the storage tank can influence the concentration of pollutants of the fermented pig slurry.

초지에서의 돈분액비 시용수준에 관한 연구

윤세형(Sei Hyung Yoon),임영철(Young Chul Lim),김종근(Jong Geun Kim),정의수(Eui Soo Jeong) 한국초지조사료학회 2006 한국초지조사료학회지 Vol.26 No.2

This experiment was carried out to investigate the availability of swine slurry on mixed grassland pasture. Three types of fertilizer was used, chemical fertilization(N-P₂O?-K₂O=210-150-180 ㎏/㏊), no fertilization and swine slurry was further subdivide into three groups (100%, 150%, 200%) as compared to the level of N used in the chemical fertilizer. The results showed that dry mater yield of forage was increased with increasing application level of swine slurry. Production of dry matter of swine slurry 200% was similar to that of chemical fertilizer, but percentage of legume in mixed pasture was lower in chemical fertilization. Percentage of legume was increased with increasing application level of swine slurry. Level of NO₃-N in filtered water was very low in all groups applied with swine slurry. Based on this results the optimum level of swine slurry application is 200% of the normal standard of N fertilizer used in grassland pasture.

남부지역에서 유기조사료 생산에 적합한 작부체계에 관한 연구

윤세형(Sei Hyung Yoon),김종근(Jong Geun Kim),정의수(Eui Soo Jeong),임영철(Young Cheol Lim) 한국초지조사료학회 2008 한국초지조사료학회지 Vol.28 No.4

본 시험은 유기조사료 생산에 적합한 동ㆍ하계 사료작물을 선정하고, 이를 통한 지역별 유기조사료 생산을 위한 적정 작부체계를 선발하기 위하여 수행되었다. 관행재배 조건과 유기재배 조건에서의 사료작물별 생육특성의 차이는 하계사료작물에서 현저하게 나타났다. 즉 사료용 옥수수는 잡초 발생으로 생육이 억제되어 관행재배에 비해 현저한 수량감소를 나타낸 반면 수수×수단그라스 교잡종은 잡초 발생이 없어 관행 옥수수 대비 높은 수량을 나타내었다. 동계사료작물은 관행재배와 유기재배에 의한 차이는 크지 않았고, 호밀과 이탈리안 라이그라스 두 작물간 건물생산성 측면에서는 호밀이 약간 우세하였으나, 사료가치를 고려한 가소화영양소 총량에서는 이탈리안 라이그라스가 우수하였다. 그러나 그 차이는 크지 않아 남부지역에서는 호밀과 이탈리안 라이그라스 모두 유기조사료 생산에 적합한 동계사료작물로 판명되었다. 본 시험의 결과를 종합적으로 고려한 남부지역에서 유기조사료 생산을 위한 최적 작부체계는 수수×수단그라스 교잡종과 호밀 혹은 수수×수단그라스 교잡종과 이탈리안 라이그라스라 할 수 있다. This experiment was conducted to investigate the selection of regional double cropping system for production of organic forage in southern region of Korea. The species of forage crop used in this experiment were com, sorghum×sudangrass hybrid and japanese millet for summer crops and rye and Italian ryegrass for winter crops. In organic cultivation condition, sorghum×sudangrass hybrid showed higher DM(dry matter) and TDN(total digestible nutrient) yield than that of com. Dry matter yield of com which cultivated in organic condition decreased to about 35% that of control because of weed. In winter crops, DM and TDN yield of rye is similar to that of Italian ryegrass. We could not find out the difference of nutrient value between each treatments. It means that the amount of nutrient is affected by DM productivity of each crop. The result of this study indicated that sorghum×sudangrass hybrid (summer crop) and rye (winter crop), sorghum×sudangrass hybrid (summer crop) and Italian ryegrass (winter crop) cropping system could be recommended as producing high yield of organic forage in southern region of Korea.

중부지역에서 유기조사료 생산에 적합한 작부체계에 관한 연구

윤세형(Sei Hyung Yoon),김종근(Jong Geun Kim),정의수(Eui Soo Jeong),성시흥(Si Heung Sung) 한국초지조사료학회 2007 한국초지조사료학회지 Vol.27 No.4

본 시험은 유기조사료 생산에 적합한 동·하계 사료작물을 선정하고, 이를 통한 지역별 유기조사료 생산을 위한 적정 작부체계를 선발하기 위하여 수행되었다. 관행재배 조건과 유기재배 조건에서의 사료작물별 생육특성의 차이는 하계사료작물에서 현저하게 나타났다. 즉 사료용 옥수수는 잡초 발생으로 생육이 억제되어 관행재배에 비해 현저한 수량감소를 나타낸 반면 수수×수단그라스 교잡종은 잡초 발생이 없어 관행 옥수수 대비 높은 수량을 나타내었다. 동계사료작물은 관행재배와 유기재배에 의한 차이는 크지 않았으나, 생산성 측면에서 이탈리안 라이그라스 보다 호밀이 우수하였다. 따라서 작부체계에 영향을 미치는 요인이 하계 사료작물에서는 잡초의 발생여부, 동계사료작물에서는 사료작물의 종류에 기인됨이 밝혀졌다. 이를 종합적으로 고려한 중부지역에서 유기조사료 생산을 위한 최적 작부체계는 중부지역에서는 수수×수단그라스와 호밀이라 할 수 있다. This experiment was conducted to investigate the selection of regional double cropping system for production of organic forage in middle part of Korea. The species of forage crop used in this experiment were corn, sorghum × sudangrass hybrid and japanese millet for summer crops and rye and Italian ryegrass for winter crops. Sorghum × sudangrass hybrid showed higher DM (dry matter) and TDN (total digestible nutrient) yield than that of corn. Dry matter yield of corn decreased to 56% that of control because of weed. In winter crops, DM and TDN yield of rye is higher than that of Italian ryegrass. Rye was more adequate to produce organic forage in middle part of Korea. We could not find out the difference of nutrient value between each treatments. It means that the amount of nutrient is affected by DM productivity of each crop. The result of this study indicated that sorghum×sudangrass hybrid (summer crop) and rye (winter crop) cropping system could be recommended as producing high yield of organic forage in middle part of Korea.