Rigidity of proper holomorphic maps from B^(n+1) to B^(3n-1)

왕승호 대한수학회 2009 대한수학회지 Vol.46 No.5

Let B^{n+1} be the unit ball in the complex vector space C^{n+1} with the standard Hermitian metric. Let ∑^n = ∂B^{n+1} = S^{2n+1} be the boundary sphere with the induced CR structure. Let f : ∑^n→∑^{N} be a local CR immersion. If N<3n-1, the asymptotic vectors of the CR second fundamental form of f at each point form a subspace of the CR(horizontal) tangent space of ∑^n of codimension at most 1. We study the higher order derivatives of this relation, and we show that a linearly full local CR immersion f: ∑^n→∑^{N}, N ≤ 3n-2, can only occur when N = n, 2n, or 2n+1. As a consequence, it gives an extension of the classification of the rational proper holomorphic maps from B^{n+1} to B^{2n+2} by Hamada to the classification of the rational proper holomorphic maps from B^{n+1} to B^{3n-1}. Let B^{n+1} be the unit ball in the complex vector space C^{n+1} with the standard Hermitian metric. Let ∑^n = ∂B^{n+1} = S^{2n+1} be the boundary sphere with the induced CR structure. Let f : ∑^n→∑^{N} be a local CR immersion. If N<3n-1, the asymptotic vectors of the CR second fundamental form of f at each point form a subspace of the CR(horizontal) tangent space of ∑^n of codimension at most 1. We study the higher order derivatives of this relation, and we show that a linearly full local CR immersion f: ∑^n→∑^{N}, N ≤ 3n-2, can only occur when N = n, 2n, or 2n+1. As a consequence, it gives an extension of the classification of the rational proper holomorphic maps from B^{n+1} to B^{2n+2} by Hamada to the classification of the rational proper holomorphic maps from B^{n+1} to B^{3n-1}.

강우 유출시 하천의 수질혼합에 대한 분산계수의 산정

왕승호(Seung Ho Wang),문형부(Hyoung Bu Moon) 大韓環境工學會 2003 대한환경공학회지 Vol.25 No.3

순천시의 생활폐기물 발생량 예측 및 재활용시설의 용량산정에 관한 연구

허관,문옥란,왕승호,Hu, Kwan,Moon, Ok-Ran,Wang, Seung-Ho 유기성자원학회 2001 유기물자원화 Vol.9 No.4

The purpose of this study is to provide basic information for a future countermeasure municipal and to establish several wastes policy after investigating solid wastes from Sunchon City. In addition, this research can be supported to manage of recycling plant and to reuse plant of each wastes. Results are as bellows after checking up and analysis type of waste in Sunchon city Unit solid waste generation rate from single family is $0.50kg/person{\cdot}day$, and total solid wastes are 41.9ton/day. Unit solid waste generation rate from apartments is $0.45kg/person{\cdot}day$, and solid wastes generation is 55.5ton/day. Unit solid waste generation rate from agricultural is $0.22kg/person{\cdot}day$ and total solid wastes are 13.5ton/day. That show total amount of municipal solid wastes from residential are 110.9ton/day. Unit solid waste generation rate from traditional markets is $1.85kg/person{\cdot}day$, and solid waste total volume is 5,400kg/day. Unit solid waste generation rate from small store is $2.03kg/person{\cdot}day$, and solid waste total are 25,101kg/day. Therefore, this show that total wastes are 30.50kg from downtown and commercial area. Solid waste quantity from Industrial area (Factory region) is 8.5ton and in case of school and hospitals are 7.2kg/day and 3.0kg/day. Solid waste amount from Institutional is 6.6kg/day. Food wastes were eliminated from municipal solid wastes as standard 63.4ton/day, and combustible wastes were 126.9ton/day. If it schedule about 5 years (by 2006) as durable year for food wastes treatment plant, it is expected 42.5ton/day for treatment capacity. We can judge that it is effective to be set 2 lines equipment ${\times}25ton/day$ as treatment ability under considering unexpected working condition such as any repair, trouble and an electrical load. If it schedule about 10 years (by 2011) as durable year for food wastes treatment plant, it is expected 150 ton/day for treatment capacity. We can conclude that it is effective to be set 2 lines equipment ${\times}80ton/day$ as treatment ability under considering working condition such as low loaded operating and the repair for incineration. 순천시 생활계폐기물의 배출특성을 제시하고 장래 폐기물대책을 수립하는 기본적인 자료로 정보를 제공하고자 폐기물별 자원화시설의 용량을 산정하고 재활용시설의 운영관리 및 제반폐기물정책 수립에 활용하도록 하기 위해서 조사분석하여 다음과 같은 결과를 얻었다. 일반주택의 배출량원단위는 0.50kg/인${\cdot}$일로 배출량은 41.9톤/일, 공동주택의 배출량원단위는 0.45kg/인${\cdot}$일로 배출량은 55.5톤/일, 읍 면지역의 배출량원단위는 0.22kg/인${\cdot}$일로 배출량은 13.5톤/일로 나타나 주택지역의 생활계폐기물 배출량은 110.9톤/일이다. 재래시장의 배출량원단위는 1.85kg/상가 일로 배출량은 5,400kg/일이며, 소규모점포의 배출량원단위는 2.03kg/상가 일로 배출량은 25,101kg/일로 나타나 상가지역의 생활계폐기물 배출량은 30,501kg/일이다. 공장지역에서 배출되는 사업장생활계폐기물은 1일 평균 8.3톤, 학교와 병원 및 업무지역에서 배출되는 생활계폐기물의 1일 평균배출량은 각각 7.2kg과 3.0kg 및 6.6kg이다. 생활폐기물 중에서 음식물쓰레기는 평균 63.4톤/일 배출되었으며, 소각대상 가연성폐기물은 126.9톤/일 배출되었다. 음식물쓰레기처리시설의 내구년도를 약 5년(2006년도)으로 계획하면 처리대상량은 1일 42.4톤이 예상되며, 저부하 운전이나 고장보수로 인한 가동중지 등의 문제를 고려하여 처리능력을 25톤/일${\times}$2계열로 설치하는 것이 효율적일 것으로 판단된다. 소각처리시설의 내구년도를 약 10년(2011년도)으로 계획하면 처리대상량은 1일 150톤/일이 예상되며, 저부하 운전이나 고장보수로 인한 소각작업 중지 등의 문제를 고려하여 처리능력을 80톤/일${\times}$2계열로 설치하는 것이 효율적일 것으로 판단된다.

수생식물을 이용한 수질정화 SYSTEM 개발에 관한 연구

신대윤,홍완해,왕승호 조선대학교 환경공해연구소 1999 環境公害硏究 Vol.15 No.2

This study focused on the removal of COD, SS, T-N and T-P of home wastewater in batch and continuous culture reactors using parsley. And the amounts of nitrogen and phosphorus in the tissues of parsley were also detected. The results are as follow ; 1. Parsley has achieved 42% COD removal rate, 55% SS, 10% T-P and 41% T-N for 48 hours retention time. Residual concentration was COD 6.1㎎/ℓ, SS ll㎎/ℓ, T-P 1.112㎎/ℓ and T-N 4.9㎎/ℓ respectively. 2. Nitrogen and phosphorous content, accumulated in the tissues of parsley are 40.4% and 9.2% respectively in batch reactor with 48 hours SRT. They are presenting increasing rate 37.6% of nitrogen and 9% of phosphorous, compared with their influent sample, contending 2.8% of nitrogen and 0.19% of phosphorous. 3. Continuous reactor has achieved 42% COD removal rate, 62% SS, 10% T-N, and 46% T-P, Effluent COD concentration was 5.8㎎/ℓ, SS 8.13㎎/ℓ, T-P 0.84㎎/ℓ and T-N 4.09㎎/ℓ.

순천시 생활쓰레기의 계절별 조성 및 물리·화학적 특성에 관한 연구

허관,고오석,왕승호,Hu, Kwan,Ko, Oh-Suk,Wang, Seung-Ho 유기성자원학회 2001 유기물자원화 Vol.9 No.4

쓰레기의 효과적인 처리방안을 제시하고 장래 대책을 수립하는데 자료로 활용하도록 하기 위해서 순천시 생활쓰레기의 물리 화학적 특성을 조사하였다. 발생 쓰레기의 계절별, 성상별 특성을 조사 분석하여 다음의 결과를 얻었다. 생활쓰레기의 겉보기밀도는 가연성쓰레기가 $219kg/m^3$, 비가연성쓰레기는 $391kg/m^3$로 나타났다. 가연성쓰레기 중에서 음식물쓰레기의 습윤질량 중량비 가중평균은 38.1%를 차지하였으며, 음식물쓰레기를 제외한 가연성쓰레기는 49.6%를 나타내었다. 음식물쓰레기를 제외한 가연성쓰레기의 수분함량, 가연분함량 및 회분함량의 가중평균은 각각 16.9%, 68.1% 및 15.0%로 나타나 소각처리의 특성이 양호하게 나타났다. 음식물쓰레기를 제외한 가연성쓰레기의 저위발열량은 2,962kcal/kg로 나타나 소각처리의 특성이 아주 양호하게 나타났다. To provide successful treatment policy and to apply sources for establishing plan, municipal solid wastes quantity was investigated as physical and chemical characteristics from Sunchon city. Results are like following after checking out characteristics by seasons, type. The average specific weight of municipal solid wastes is $219kg/m^3$ for combustible wastes, $391kg/m^3$ for non-combustible. Food wastes of combustible wastes contained moisture of 38.1% as standard of moisture weight per real weight, 49.6% moisture is contained in non-combustible wastes except food wastes moisture. Moisture, volatile and ash are contented by 16.9%, 68.1% and 15.0% in combustible wastes except food wastes. That means combustible wastes are available a refuse incineration. The low calorific value of only combustible waste is 2,962kca1/kg that is good for refuse incineration.

이성적 행동이론에 의한 제조업 근로자들의 호흡보호구착용에 영향을 주는 요인분석

장세진,조영봉,이왕로,고상백,최흥렬,안재순,허정철,왕승호,박기우,차봉석 한국산업위생학회 2000 한국산업보건학회지 Vol.10 No.2

Objectives : The purpose of this study is to analyze the factors associated with respirator usage on the basis of reasoned action theory. Methods : The data were collected from August 1 to September 30, 1999, and study subjects consisted of 303 workers who were employed in the manufacturing industries. A self-administered questionnaire was used to measure the attitude, subjective none and related factors. Results : In bivariate analysis, the variables related to protector usage were prevention of occupational disease, protection of toxic material, disturbance during working, troublesome of usage, proper exchange of protector. Multivariate logit analysis was used to estimate factors associated with respirator usage. Significant predictors that are related to respirator usage were attitude toward the behavior, size of industry and proper exchange of protector. Conclusions : The results suggest that it is strongly required to focus on attitude toward the behavior in order to improve workers' usage of respirator.

석유화학공장 폐수슬러지를 이용한 벽돌제조 연구

허관(Kwan Hu),류적용(Juk-Yong Lu),왕승호(Seung-Ho Wang) 유기성자원학회 2003 유기물자원화 Vol.11 No.2

석유화학공장폐수 슬러 지 를 폐석고와 시벤트, fjy ash 및 고화제 등을 배합하여 성형하면 시멘트벽돌 및 보통시멘트의 압축강도 기준을 초과함으로 제조된 고회쉐는 벽돌,블록,경링골재,노반재 등으로 활용이 기능할 것으로 판단되었다. 실험 결과 다음의 결과를 얻었다. 시멘트량을 전체 중량비의 20%인 1. 29kg에서 f1yash/슬리지의 배합비의 모든 조건과 시멘트량을 전체 중량비의 15% 인 0.9kg에서 f1yash/슬러지의 배합비가 0.31~0 .45 일 때,시멘트벽돌 및 보통시멘트의 압축강도 기준을 초과하였다. 제조된 고화체(제품)의 유해성 평가를 위해서 침출수 중의 Cr+fi, CU, Zn, Cd, Pb의 용출농도를 실시한 결과 모든 대상시료의 중금속 농도는 배출허용기준치 이내를 유지하여 유해물질로 인한 문제는 없을 것으로 판단되었다. 고화제를 시벤트벽돌 빛 보통시멘트에 준해서 활용이 가능한 제조조건에서 제조원가를 조사하였다. 조사결과 자원화시설의 고화체 제조능력을 연간 약 18, 000톤을 기준으로 할 때,총괄원가및 톤당제조원가는 각각 678,664천원 및 37,704원으로 조사되었다. To investigate the availability of solicLfìed wastes as resource, wastεwater sludge, waste gypsum and fly ash were mixed and rhe resu!ts wirh various mixing ratios are as follows. Compressive strengrh turned out to be increasing as rhe amount of waste gypsum increases, keeps longer curing inhibition, and higher forming pressure under the conditions of wasre gypsum/sludge ratio 0.31 ~ 0.45,and 0.9kg cement as 15% and 1.2kg cement as 20% of total anlount. Solidifìed agem under rhe fly ash/sludge ratio 0.45, 0.6, compressive strengrh seemed to be higher than standard one which means solidifìed wastes with these conditions could be applicable in reallife. These results inform that concentrations of rhe leachate Cr<6, C u, Zn, Cd, Pb solicLfìed matrix, comaining low concεntration of hεavy metal, were cured with/without enough time it still will cause adverse effecr on nature environmem and application of heavy metal sequester must be needed to reuse industrial wastes from incineration plant solidifìed matrix. Total cost price, when considering manufacturing capability of rhe facilities for resourcerizing as 18,000ton was presented 678,664,000 won, as it were, manufacturing cost price was 37,704 won per ton. The results as above has shown that it’s possible to use the mixture of waste gypsum/ sludge, fly ash/sludge, cement, adcL tions, and solidifìcation matter as substitute of marerials like brick, block, interlocking which has proper compressive strength ofKS L 5201 and KS F 4004.

슬러지의 탈수 특성에 대한 마이크로파와 약품개량의 영향

박상숙(Sang Sook Park),강화영(Hwa Young Kang),왕승호(Seung Ho Wang) 大韓環境工學會 2005 대한환경공학회지 Vol.27 No.7

인라인 응집제 혼화시스템의 혼화 및 응집특성

양희천(Hei-Cheon Yang),박상규(Sang-Kyoo Park),왕승호(Seung-Ho Wang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5

The objective of this paper was to investigate the mixing characteristics of an three-stage inline coagulant mixing system experimentally. Wastewater samples of pH 8.5 and initial turbidity 1,000NTU were taken from a site of tunneling work. At the constant dosage, 0.36mL/L, of polymer as coagulant aids, the coagulation efficiency with the dosage of PAC as coagulant was about 4∼6% at 10 minutes after sampling. In the case of 2 different velocity gradient conditions, the efficiency of turbidity removal was increased about 6.5∼8% with increasing the dosage of coagulant while, the efficiency was increased about 20∼21.5% with increasing the dosage of coagulant aids. The efficiency of turbidity removal with the settling time after sampling was about 90% after 1 minute, and the efficiency was about 95% after 5 minutes.