응축방식을 이용한 담수화 시스템의 성능예측을 위한 분석연구

김철호,김원일,최재영,김재철,김민선,Kim, Chul-Ho,Kim, Won-Il,Choi, Jea-Young,Kim, Jae-Choul,Kim, Min-Sun 대한기계학회 2014 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.2 No.1

본 연구에서는 태양열에 의해 증발된 해수면에서의 수증기를 응축의 원리를 이용하여 담수의 생산이 가능한 친환경 담수장치(Eco-friendly Desalination System)를 고안하고, 가능성을 판단하는데 연구의 목적을 두고 있다. 응축 열전달 공식을 이용하여 습공기의 물성변화에 따른 연간 응축수 생산량을 예측하였으며, 항온항습챔버의 실험을 통해 실제 습공기조건 변화에 따른 응축량을 측정하였다. 습공기의 이론 응축률과 실험을 통해 측정한 실제 응축률의 오차율을 산출하였으며, 오차의 원인을 분석하고 응축률 보정계수인 응축계수와 점성계수를 구하여 보정된 이론 응축률 공식에 도출하였다. 보정된 응축률 식을 이용하여 설계된 규모의 풍력터빈연간 생산 가능한 담수량을 산출한 결과 최대 연간 약 2,927톤 정도의 담수를 생산할 수 있다는 사실을 알 수 있었다. A new concept of an Eco-friendly desalination method is introduced in this study. The main idea of the desalination method of seawater is the condensation of the vaporized seawater by solar heat energy on the surface of seashore. The wind turbine blade plays a role of heat exchanger condensing the vaporized water in the air. In this analytical study, the availability of the proposed desalination system was studied. First, an analytical condensation theory of the vaporized water in air was arranged and the parametric study was conducted to estimate the amount of freshwater produced from the system with the change of the temperature difference between the humid air and turbine blade, and the relative humidity in air, and wind speed. From the analytical calculation, 2,927(ton/year) of freshwater was produced at the vertical-type wind turbine (Diameter=4m, Height=3m) as the relative humidity is 100%, the temperature difference between the impeller blade and the humid air is $40^{\circ}C$ and the wind speed is 10m/s.

유기질비료 시용이 무의 생육 및 수량에 미치는 영향에 관한 연구

김철호,윤화모,Kim, Cheol-Ho,Yun, Hwa-Mo 배재대학교 자연과학연구소 1992 自然科學論文集 Vol.5 No.1

유기질비료 시용이 봄 및 가을 작형에서 무 품종의 생육 및 수량에 미치는 영향을 알아보고자 본실험을 실시한 바 다음과 같은 결과를 얻었다. 1) 무의 엽장, 엽중, 근장, 근경, 근중등 생육은 봄, 가을작형 모두에서 3요소, 발효계분 + 1/5 량NK추비, 발효계분, 계분, 무처리구 순으로 촉진하는 경향이었으며, 엽의 chlorophyll 함량과 질소함량도 생육에서와 같은 처리순으로 증가하였다.2) 봄 및 가을작형의 수량에 있어 발효계분 450kg 처리구는 3요소구에 비해 저하되는 경향이었으나 전국평균 수량을 상회하였다.3) 발효계분처리로 4회연속재배한 경우보다 1회재배한 경우보다 3요소처리구와의 무 생육차가 감소하였다.4) 무 재배후 토양의 질소 및 마그네슘함량은 처리간 비슷한 경향이었으며 pH, 유기물함량과 인산 및 칼슘함량은 3요소구에 비해 발효계분에서 높은 경향이었다. The experiment was conducted to evaluate the effects of organic fertilizer. Sarang of fermented poultry manure. Miwon glutamic acid fertilizer and poultry manure, on the growth and yield of radish cultivated in spring and autumn. 1) The growth of leaf length, leaf weight, root length, root diameter and root weight of radish in two culture types was stimulated in order of NPK, fermented poultry manure + 1/5NK, fermented poultry manure, poultry manure and control treatment, and chlorophyll and nitrogen content of leaf were increased in order of the above mentioned fertilizers.2) Yield decreased in fermented poultry manure plot of 450kg application comparison with NPK plot but the one of 1800kg fermented poultry manure was increased. The yield of 450kg Sarang plot was sufficient as compared with Korean average yield of spring and autumn culture.3) The difference of growth of radish between treatments of fermented poultry manure and NPK was lowered by continuous application of Sarang organic fertilizer.4) Soil nitrogen content and exchangeable Mg were similar in all treatments but soil pH, the contents of organic matter, $P_2 O_5$ and Ca were high in the fermented poultry manure treatment.

A Single Amino Acid Change at the Signal Sequence of a Cl-amylase Gene Truncates it's Enzyme Translocation in E. coli

김철호,권석태,이대실,Kim, Cheorl-Ho,Kwon, Suk-Tae,Lee, Dae-Sil Korean Society for Biochemistry and Molecular Biol 1991 한국생화학회지 Vol.24 No.4

B. circulans 유래의 Cl-amylase는 전형적인 분비효소 단백질이다. 본 효소 단백질의 세포내 수송기구를 해명하고 분비에 필요로 하는 signal sequence 의 기능을 확인하기 위하여 signal sequence의 16번째 아미노산 잔기(serine)를 proline(${\alpha}$-helix breaker)과 threonine으로 In vitro mutagenesis를 통해 바꾸었다. Recombinant wild형(serine)과 mutation된 Cl-amylase(proline과 threonine) 유전자 각각을 대장균에 도입하여 세포내의 단백질 수송을 효소활성과 변역학적 방법으로 검토한 결과, proline-mutant형 이 wild형의 약 5% 정도로 periplasmic space에서 검출되었으며, 분자량에 있어서는 약 3,000 dalton의 차를 보였다. 그러나, threonine-mutant는 wild(serine) type의 경우와는 차이가 검출되지 않았다. 상기의 결과들로, 대장균에서의 이종유전자 산물의 성공적인 processing과 protein transportation을 확인, 해명하게 되였다. The possible signal sequence capable of transporting the Cl-amylase from B. circulans has been analyzed with in vitro mutagenesis techniques. A residue in the $NH_2$-terminal region near to the postulated cleavase site was changed by site-directed mutagenesis from a serine into proline and threonine. Comparison of Cl-amylase acitivity outside and inside the cell in strains containing the cloned wild type and mutagenised genes showed that this single amino acid prevents largely the translocation of the enzyme in the periplasmic space: in transformed E. coli the proline -mutant Cl-amylase showed 5% secretion of wild type Cl-amylase and threonine-mutant Cl-amylase.

육가공품(肉加工品)의 유통(流通) 및 산업구조(産業構造) 분석(分析)

김철호,조경란,Kim, Chul Ho,Cho, Gyeong Ran 충남대학교 농업과학연구소 1988 Korean Journal of Agricultural Science Vol.15 No.2

This study is to analyse marketing and industrial structure of meat processing industry and to examine it's current situation related to agriculture. For this purpose 1. This paper surveys the history of meat processing industry, and analyses current situation of meat processing industry, based upon economic statistic data. 2. For the research of marketing structure of meat processing products, this paper not only ciassifies into three catagories; the supply of raw meat, main marketing organization, and path, but measures magnitude of Marketing Bill and Farmer's Share practically through statistic data and an on-the-spot survey. 3. This study also attempt to explain the relation of meat processing industry and the other industry and role of meat processing industry is Korean economy by the use of input-output table. The results of the study are as follows; 1. The meat processing industry in Korea produces low quality, and expensive raw meat with limited quality, inefficiency of marketing structure, and unrelated livestock and meat processing industry. 2. Korea market structure of meat processing products has been changed into oligopoly from monopoly by a new corporation entered into monopoly and the size of meat processing market firms has been normalized. 3. Meat processing industry is very important considering with its high back-linkage-effect. In order to develop meat processing industry and marketing, it is essential that operation of intergrated meat market center, meat market center should be efficiently operated. The efficient utilization of domestic resource for raw meat and development of processing technique have to be required, by means of the governmental support.

개에서의 indocyanine green 배설시험 및 혈장효소 활성치의 변화

김철호,최일관,손민수,김진구,강정부,Kim, Cheol-ho,Choi, Il-kwan,Son, Min-soo,Kim, Jin-gu,Kang, Chung-boo 대한수의학회 1992 大韓獸醫學會誌 Vol.32 No.4

This experiment was carried out to establish a proper method of indocyanine green(ICG) excretion test for a applicable liver function test in dogs. The half life(T1/2), fractional clearance rate(KICG) and retention rate after injection of ICG with or without administred carbon tetrachloride($CCl_4$) were also invested. The results obtained were as follows ; 1. The maximum absorbance of ICG in plasma was at 810nm. 2. Half life and fractional clearance rate when administered 0.25 and 0.50mg of ICG per Kilogram body weight were $6.33{\pm}0.58$ minutes and $0.11{\pm}0.99$/minute in the former, $10.01{\pm}1.0$ minutes and $0.07{\pm}0.007$/minute in the latter, respectively. The ICG removal rate was exponentially linear for the first 15 minutes after injection both, of 0.25 and 0.50mg of ICG. 3. One day following the administration of $0.0042m{\ell}\;CCl_4$ kilogram body weight which injected 0.50mg of ICG, half life was more longer and fractional clearance rate was significantly reduced than that of ICG single injection. 4. Plasma retention rate when 15, 30, 45 minutes after injection dose of 0.25 and 0.50mg ICG per Kilogram body weight, $14.7{\pm}4.8$, $5.1{\pm}3.1$, $2.6{\pm}1.6%$ in the former, $26.9{\pm}1.8$, $11.1{\pm}2.4$, $4.8{\pm}1.3%$ in the latter, respectively. However, after administration of $CCl_4$, plasma retention rate of ICG at a dose of 0.50mg, it was $39.3{\pm}0.9$, $16{\pm}2.9$, $10.7{\pm}0.1%$, respectively. 5. Plasma enzyme(AST, ALT, r-GTP) activities administered with $CCl_4$ were increased, but there was no change which injected any dose of single ICG injection. From these results, ICG excretion test to dog is applicable to evaluation of liver function in both clinical and research.

HYDRA 70 로케트 체계(상)-하늘과 땅의 용아(소공자)

김철호,Kim, Cheol-Ho 한국방위산업진흥회 1987 國防과 技術 Vol.- No.95

한국 동해안에 출현하는 냉수괴의 특성과 기원

김철호,김구,Kim, Cheol Ho,Kim, Kuh 한국해양학회 1983 韓國海洋學會誌 Vol.18 No.1

To serch the origin of the cold water mass along the east coast of Korea its characteristics are inrestigated based upon Cooperative Study of Kuroahio and Fisheries Research and Development Agency data. In the southwestern part of the Japan Sea the North Korean Cold Water sinks at the front and flows southwards on top of the Japan Sea Proper Water. it is found that the sunken North Korean Cold Water il high in the content of dissolved oxygen and less saline compared with the Japan Sea Proper Water. It is highly likely that the cold water mass off the Jugbyeon-Chuksan coast in summer il the North Koreah Cold Water and not upwelled Japan Sea Proper Water. It os shown that the Notth Korean cold Water Flows strongly in summer and its scuthern limit is generally off Chuksan-Janggigab and occasionally off Gampo as observed in 1973.

Redis를 활용한 Web Service 성능 향상

김철호,박경원,최용락,Kim, Chul-Ho,Park, Kyeong-Won,Choi, Yong-Lak 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.9

To improve performance, most of Web Services produce and manage User Access Logs. Through the Access Logs, the record provides information about time when the most traffic happens and logs and which resource is mostly used. Then, the log can be used to analyze. However, in case of increasing high traffics of Web Services at the specific time, the performance of Web Service leads to deterioration because the number of processing User Access Logs is increasing rapidly. To solve this problem, we should improve the system performance, or tuning is needed, but it makes a problem cost a lot of money. Also, after it happens, it is not necessary to build such system by spending extra money. Therefore, this paper described the effective Web Service's performance as using improved User Access Log performance. Also, to process the newest data in bulk, this paper includes a method applying some parts of NoSQL using Redis. 대부분의 Web Service는 성능 개선을 위해 사용자 접속 로그를 생성하여 관리한다. 생성된 접속 로그를 통해 트래픽이 많이 발생하는 시간대와 어떤 Resource가 많이 사용되는지 확인할 수 있으며 로그 분석을 통해 Web Service의 성능 측정 및 개선하는데 이용된다. 하지만, 많은 공공부문 Web Service와 같이 일정 기간 동안에 접속량이 증가할 때, 처리 할 사용자 접속 로그 수 증가로 인해 Web Service의 성능이 저하된다. 이를 해결하기 위해, 시스템의 성능을 개선하거나 튜닝을 필요로 하지만 많은 비용이 발생하게 되며 일정한 시간이 지나면, 사용자의 접속이 줄어들게 되어 더 많은 비용이 발생한다. 본 논문에서는 사용자 접속 로그 처리의 성능을 개선을 통한 Web Service의 성능개선을 제안한다. 또한, 최근 대용량 데이터를 처리하기 위하여 많이 사용되고 있는 Redis를 활용하여 NoSQL을 일부 적용한 방법을 제안한다.

Influence of Anesthesia Type on Outcomes after Endovascular Treatment in Acute Ischemic Stroke: Meta-Analysis

김철호,Kim Sung-Eun,전진수 대한신경중재치료의학회 2019 Neurointervention Vol.14 No.1

Purpose: To assess clinical and angiographic outcomes after endovascular treatment (EVT) in ischemic stroke patients according to anesthesia types (general anesthesia vs. conscious sedation). Materials and Methods: A systematic literature review through an online data base between January 1990 and September 2017 was performed. A fixed effect model was used in cases of <50% heterogeneity. The primary outcomes were good clinical outcome at the 3-month follow-up and successful recanalization. A meta-regression analysis was done to estimate primary outcomes of log odds ratio (OR) on onset-to-puncture time (OTP) differences. Publication bias was determined using Begg’s funnel plot and additional the Trim and Fill method. Results: Sixteen articles including 2,662 patients (general anesthesia, n=1,275; conscious sedation, n=1,387) were included. General anesthesia significantly decreased good outcomes than conscious sedation (OR, 0.564; 95% confidence interval [CI], 0.354–0.899). However, outcomes did not differ significantly in randomized controlled trials (RCTs; OR, 1.101; 95% CI, 0.395–3.071). Anesthesia type was not associated with successful recanalization (OR, 0.985; 95% CI, 0.787–1.233). General anesthesia increased the risk of mortality (OR, 1.532; 95% CI, 1.187–1.976) and pneumonia (OR, 1.613; 95% CI, 1.172–2.221), but not symptomatic intracranial hemorrhage (OR, 1.125; 95% CI, 0.767–1.652). The meta-regression analysis showed no linear relationship between OTP differences and log OR of good outcome (coefficient, 0.0004; P=0.95) or successful recanalization (coefficient, 0.0005; P=0.94), respectively. Conclusion: General anesthesia seemed to be associated with adverse clinical outcome after EVT. However, its efficacy was not demonstrated in RCTs. Successful recanalization did not differ according to anesthesia type. Studies using individual patient data based on further RCTs are necessary to elucidate anesthesia effect on procedural and clinical outcomes.

AOP 기술을 이용한 DEVS 기반 시뮬레이터의 적응성 향상 기법

김철호,Kim, Cheol-Ho 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.3

The DEVS formalism has the well-defined relationship between its model and simulator. However, it does not define the connection between its model and experimental frame needed when a simulator's implemented with it. So, in most DEVS based simulators, the modules of the two parts are tangled, so that changing and reusing them is not easy. This paper proposes a method to improve the changeability of the experimental frame and the reusability of the model by modularizing the two parts using the AOP technology. I applied the new method to a real project, and the result shows that it improves the two qualities effectively than before.