신경전자공학 시대의 도래

박세익,김성준,Park, Se-Ik,Kim, Seong-Jun 대한전자공학회 2007 전자공학회지 Vol.34 No.9

원발폐쇄각녹내장에서 주변 레이저홍채절개술 및 홍채성형술 후 전방 지표의 장기 변화 결과

박세익(Se Ik Park),이우혁(Woo Hyuk Lee),강태신(Tae Seen Kang),김지혜(Ji Hye Kim),한용섭(Yong Seop Han),조현경(Hyun Kyung Cho) 대한안과학회 2023 대한안과학회지 Vol.64 No.5

목적: 원발폐쇄각녹내장 환자를 대상으로 주변 레이저홍채절개술 및 홍채성형술을 시행한 후 전방 지표의 변화를 이중샤임플러그분석기를 사용하여 장기간에 걸쳐 조사하고자 하였다. 대상과 방법: 원발폐쇄각녹내장을 진단받고 레이저를 시행받은 32명의 환자들의 32안이 본 후향적 연구에 포함되었다. 급성폐쇄각발작 사례는 제외하였다. 이중샤임플러그검사는 레이저를 시행하기 전과 1주일 후, 매년마다 시행하였다. 전방깊이, 전방부피, 평균 전방각도 및 안압을 조사하였다. 결과: 평균 추적 관찰 기간은 32.28 ± 13.34개월이었으며, 연구에 포함된 환자들의 기저치는 다음과 같다: 연령, 63 ± 7.9세; 여성, 62.5%; 안압, 15.48 ± 4.79 mmHg; 전방깊이, 2.09 ± 0.19 mm; 시야검사의 mean deviation, -7.97 ± 8.49 dB. 전방깊이는 기저치에서 2.15 ± 0.32 mm로 증가하였으나 통계적으로 유의하지는 않았다(p=0.136). 전방부피는 레이저 후 기저치 78.32 ± 11.49 mm3에서 83.04 ± 11.16 mm3로 유의하게 증가하였다(p=0.011). 평균 전방 각도는 레이저 후 기저치 26.86 ± 2.53°에서 28.82 ± 4.64°로유의하게 증가하였다(p=0.022). 안압은 레이저 후 기저치에서 13.06 ± 2.21 mmHg로 유의하게 감소하였다(p=0.001). 결론: 원발폐쇄각녹내장 환자에서 레이저 시행 후 전방각 지표들이 효과적으로 개선되었으며 장기간에 걸친 추적 관찰 동안 개선된상태가 유지되었다. 또한 안압은 레이저 시행 후 2.5년 이상의 장기 추적 관찰 동안 유의하게 감소하였다. Purpose: To investigate the long-term outcomes of anterior chamber angle parameters in patients with primary angle closure glaucoma (PACG) after peripheral laser iridotomy (LI) combined with iridoplasty (PI) using a dual Scheimpflug analyzer. Methods: This retrospective study included 32 eyes in 32 patients diagnosed with PACG who underwent LI plus PI. Patients with an acute angle closure crisis were excluded. Dual Scheimpflug analyzer images were acquired before and 1 week after LI plus PI, and yearly afterwards. Anterior chamber depth (ACD) and volume (ACV), mean anterior chamber angle (ACA), and intraocular pressure (IOP) were also measured. Results: The mean follow-up was 32.28 ± 13.34 months. Baseline demographics were age 63 ± 7.9 years, 62.5% female, IOP 15.48 ± 4.79 mmHg, ACD 2.09 ± 0.19 mm, and visual field mean deviation -7.97 ± 8.49 dB. ACD increased from baseline to 2.15 ± 0.32 mm, but it was not significant (p = 0.136). ACV increased significantly from 78.32 ± 11.49 mm at baseline to 83.04 ± 11.16 mm at the last visit after LI (p = 0.011). The mean ACA increased significantly from 26.86 ± 2.53° at baseline to 28.82 ± 4.64° at the last visit (p = 0.022). IOP decreased significantly from baseline to 13.06 ± 2.21 mmHg at the last visit (p = 0.001). Conclusions: The ACA parameters improved after LI combined with PI in patients with PACG and remained so on long-term follow- up. IOP was also significantly reduced for more than 2.5 years after LI plus PI.

서,남해안 일대 주요 방풍시설의 분석

박세익 ( Se Ik Park ),김현수 ( Hyun Su Kim ),정성훈 ( Seong Hun Jeong ),김현 ( Hyun Kim ),이상현 ( Sang Hyun Lee ),김현준 ( Hyun Jun Kim ) 전북대학교 농업과학기술연구소 2013 농업생명과학연구 Vol.44 No.2

본 연구는 서·남해안의 3개소 방풍림 및 방풍시설을 조사·분석하여 새만금 유역의 방풍림 및 방풍시설 구성에 필요한 기초 자료를 제공하기 위하여 실시하였다. 연구 대상지인 3개소 모두 방풍림 주변에 방풍시설이 조성되어있었으며 방풍시설 내부의 식재목은 생육 상태가 양호한 데 반해 외부의 식재목은 현저하게 생육 상태가 좋지 않았다. 3개소 중단순림 구조의 방풍림은 2개소이고 혼효림 구조의 방풍림은 1개소로 구성되어 있는 것으로 나타났다. 생태적, 기능적으로 안정적인 방풍림의 구조는 단순림보다는 침엽수와 상록 활엽수를 혼합하여 식재하는 혼효림이 적합하며, 수직적으로는 교목층, 관목층, 초본층이 모두 존재하는 복층구조가 방풍림 효과를 더 향상시킬 것으로 판단된다. 방풍시설을 함께 조성할 경우에 방풍 식재목의 활착률이 높아지고 생육상태가 양호해져 더 높은 방풍효과를 기대할 수 있을 것으로 판단된다. This study was conducted to get the basic information about the windbreak forest and the windbreak facilities for Saemanguem reclaimed land by researching and analyzing the three points in the western and the southern coasts. Windbreak facilities around windbreak forest in all three points of study areas were constructed, and the trees planted the inside of the windbreak facilities grew well, whereas the others did not. There were two windbreaks with only one species and one windbreak with the multiple species within all three points of study destinations. To make the ecological system and the function of windbreak forests stable, the mixed stand should be considered and tree layer, shrub layer, and herbaceous layer should coexist together in the vertical point. In the case of making windbreak facilities around windbreak forest, the survival percent of planted trees will increase and the trees will have the good state of growth.

Performance Prediction of a Combined Heat and Power Plant Considering the Effect of Various Gas Fuels

주용진,김미영,박세익,서동균,Joo, Yong-jin,Kim, Mi-yeong,Park, Se-ik,Seo, Dong-kyun 한국전력공사 2017 KEPCO Journal on electric power and energy Vol.3 No.2

The performance prediction software developed in this paper is a process analysis tool that enables one to foretell the behavior of processes when certain conditions of operation are altered. The immediate objective of this research is to predict the process characteristics of combined heat and power plant under varying operating conditions. A cogeneration virtual power plant that mimics the mechanical performance of the actual plant was constructed and the performance of the power plant was predicted in the following varying atmospheric conditions: temperature, pressure and humidity. This resulted in a positive outcome where the performance of the power plant under changing conditions were correctly predicted as well as the calorific value of low calorific gas fuel such as shale gas and PNG. The performance prediction tool can detect the operation characteristics of the power plant through the performance index analysis and thus propose the operation method taking into consideration the changes in environmental conditions.

분사각 및 분공 직경이 예혼합 압축착화 엔진 연소에 미치는 영향

국상훈,공장식,박세익,배충식,김장헌,Kook, Sang-Hoon,Kong, Jang-Sik,Park, Se-Ik,Bae, Choong-Sik,Kim, Jang-Heon 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2

The effect of injector geometries including the injection angle and number of nozzle holes on homogeneous charge compression ignition (HCCI) engine combustion has been investigated in an automotive-size single-cylinder diesel engine. The HCCI engine has advantages of simultaneous reduction of PM and NOx emissions by achieving the spatially homogenous distribution of diesel fuel and air mixture, which results in no fuel-rich zones and low combustion temperature. To make homogeneous mixture in a direct-injection diesel engine, the fuel is injected at early timing. The early injection guarantees long ignition delay period resulting in long mixing period to form a homogeneous mixture. The wall-impingement of the diesel spray is a serious problem in this type of application. The impingement occurs due to the low in-cylinder density and temperature as the spray penetrates too deep into the combustion chamber. A hole-type injector (5 holes) with smaller angle ($100^{\circ}$) than the conventional one ($150^{\circ}$) was applied to resolve this problem. The multi-hole injector (14 holes) was also tested to maximize the atomization of diesel fuel. The macroscopic spray structure was visualized in a spray chamber, and the spray penetration was analyzed. Moreover, the effect of injector geometries on the power output and exhaust gases was tested in a single-cylinder diesel engine. Results showed that the small injection angle minimizes the wall-impingement of diesel fuel that results in high power output and low PM emission. The multi-hole injector could not decrease the spray penetration at low in-cylinder pressure and temperature, but still showed the advantages in atomization and premixing.

스팀 및 석탄 주입량 변화에 따른 2단 석탄 가스화기의 성능 평가

홍진표(Hong Jin Pyo),박세익(Park Se Ik),이승종(Lee Seung Jong) 한국에너지기후변화학회 2011 에너지기후변화학회지 Vol.6 No.2

IGCC technology has been drawing attention as the upcoming alternative energy source to generate electric power for a few decades. It is because its higher efficiency and possibilities for using low rank coal and adapting carbon capture and storage. In this research, Pilot scale two-stage gasifier was used to evaluate the performance. The produced syn-gas qualities like temperature, composition and flow rate were monitored to find the effect of different coal feed rates and supplied steam quantities on the gasifier performance. And, the ABK coal from Indonesia was selected for the test as one of the sub bituminous coals. Coal feed rates to the second stage burners were changed from 10% to 90% of supplied coal to the main burners. The results demonstrate that increasing steam and coal feed rate to the second stage burners make the temperature of produced syngas reduce. Furthermore, the composition of syngas was also changed. H<SUB>2</SUB>(hydrogen) and CO<SUB>2</SUB>(carbon dioxide) was increased but CO(carbon monoxide) and CH<SUB>4</SUB>(methane) was decreased. In the case of cold gas efficiency was increased slightly as the steam and coal feed rate increased. Through this research, coal feed rate to the second stage burners was recommended up to 30% of total coal feed rate.

신재생 에너지와 기존 발전기술과의 투자리스크 요인별 민감도 비교

고경호(Koh, Kyung-Ho),박세익(Park, Se-Ik) 한국신재생에너지학회 2011 신재생에너지 Vol.7 No.4

Recently, electricity industry is facing high market uncertainty which has ever had and which increase risks in power market. In this study, we analyze risk factors such as discount rates, initial investment (overnight cost), plant factor, fuel cost, carbon price, etc, for the perspective of investor. For the analysis of risk factors, we used LCOE method. The results of this study show that renewable energy is more affected by plant factor and overnight cost than other risk factors. First, Renewable energy has higher proportion of overnight cost in the total investment than that of other technologies. Second, renewable energy is free of fuel cost and carbon price so plant factor is the most important factor, in other words, competitiveness of renewable energy depends on plant factor. Furthermore, we conducted economic feasibility of wind power and PV in domestic case study. The minimum requirement condition to get profitability is that plant factor 15% and overnight cost 6,000,000/kW and 26%, 2,200,000/kW for PV and Wind Power, respectively.

한국형 사유림 경영규모화모델 개발을 위한 적지 선정 -전라북도 중심으로-

김현수 ( Hyun Soo Kim ),박세익 ( Se Ik Park ),김현준 ( Hyun Jun Kim ),이상현 ( Sang Hyun Lee ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-

영세성과 분산성이 심각한 현재의 사유림 소유규모에 따른 용재 및 단기임산물 생산 등 임업 소득의 부진 현상에 대한 해결방안을 제시하기 위해 한국형 사유림경영규모화모델 개발이 필요한 실정이다. 이에 따라, 과학적이고 합리적인 방법을 통한 적지선정으로 한국형 사유림경영규모화모델 개발의 원활한 진행에 이바지할 수 있도록 본 연구를 실시했다. 본 연구는 전라북도를 중심으로 진행되었다. 특히, 행정구역 면적 대비 산지비율이 높아 대상지 선정에 유리한 무주(81.3%), 진안 (77.5%), 장수(75.3%)를 중심으로 연구후보지를 선정하였다. 또한, 연구후보지 선정은 데이터마이닝 분석의 대표적인 분석 방법인 Decision Tree를 이용했다. Decision Tree의 후보지 선정기준은 GIS 10.1version을 이용하여 행정구역도 및 산림입지도(산지면적, 지리, 경사, 국 사유림 경계)의 DB와 각군의 대리경영계약면적을 이용하여 설정하였다. 이러한 과정을 통해 리 단위 임상면적 900ha 이상, 지리 6이하, 경사 25˚ 이하, 사유림 면적비율 90% 이상, 대리경영 계약면적 비율 20% 이상의 Decision Tree의 후보지 선정기준이 설정되었다. 선정기준을 만족하는 최종후보지로 진안군 용담면 송풍리, 진안군 성수면 중길리, 무주군 무풍면 금평리가 선정되었다. 최종 후보지들은 산림경영에 유리한 지리적 조건을 갖췄기 때문에, 대리경영계약 면적이 높아 산주들의 협조와 체계적인 관리에 유리한 진안군 용담면 송풍리를 최종 대상지로 선정하였다. It is necessary to develop a scale improvement management model of private forests in Korea to propose solution for low forestry income and a short-term production of forest products that caused by small and dispersed private forest proportion. For this reason, we conducted this research to support Korea`s scale improvement management model of private forest through scientific and logical methods of site selection. This research is conducted almost in the Jeollabuk-do. Also we selected sites based in Muju(81.3%), Jinan(77.5%), Jangsu(75.3%) which have a high proportion of mountains. Selection of sites of the research using a Decision Tree analysis which used in typically. Selection standard of proposed sites are selected by DB of political map and forest location(forest area, accessibility, slope, boundary of national;private forest) with GIS 10.1version and use of forest area of proxy management in each county. Through this process, Decision Tree set up a selection of site and it appears forest area of more than 900ha of regional unit, 6 or less accessibility, less than 25. slope, 90% or more of private forest area, more than 20% of the proxy management contract area. The finalists to meet the standard of selection are Songpungri Yongdammyeon in Jinan, Junggilri Seongsumyeon in Jinan and Geumpyeongri Mupungmyeon in Muju. This proposed sites have favorable geological condition for forest management and high percentage of proxy management. As a consequence, Songpungri Yongdammyeon in Jinan was selected as the finalist which has an advantage in cooperation of forest owner and systematic management.

맞춤형 조림지도 데이터를 이용한 자작나무 지위지수 추정

최석원(Seok Won Choi),박희정(Hee Jung Park),고병준(Byung Jun Ko),박세익(Se Ik Park),이상현(Sang Hyun Lee) 한국데이터정보과학회 2021 한국데이터정보과학회지 Vol.32 No.6

본 연구는 맞춤형 조림지도제작의 데이터를 추출하여 전라도 지역 자작나무 임분을 대상으로 수고생장모델을 개발한 뒤 가장 적합한 모델을 기반으로 지위지수 곡선을 개발하였다. 또한, 본 연구에서 지위지수를 국가수준에서 사용하는 지위지수 곡선과 비교 및 분석하였다. 그 결과 전라도 지역 자작나무 임분에 대한 수고생장모델은 Gompertz 식이 가장 적합한 것으로 분석되었으며, 지위지수 곡선은 임령이 증가함에 따라 연년생장량이 점차 완만해지는 시그모이드 곡선으로 나타났다. 본 연구에서 개발한 지위지수 곡선과 국가수준의 지위지수 곡선을 비교 및 분석한 결과, 본 연구에서 개발한 지위지수 곡선이 국가수준의 지위지수 곡선보다 더 다양하게 나타났다. 추가로 전라도 지역의 지리적, 생태적, 환경적 영향을 포함한 지위지수 곡선으로써, 전라도 지역의 현실임분에 적용할 수 있어 매우 중요하다고 판단되며 추후 시·도별 현실임분에 맞는 지위지수 곡선을 개발할 필요성을 제시할 수 있을 것이다. This study is designed to develop the site index curves using data for customized afforestation map production project based on the most appropriate height growth models which are also developed in the study of Betula platyphylla. In addition, it was intended to compare and analyze the index curve developed in the study and the index curve developed by the national policy. The results showed that the Gompertz function was suitable and the site index curve was shown as a sigmoid curve. As a result of comparing and analyzing developed the site index curve and the site index curve of the national, developed the index curve was more diverse. In addition, developed the index curve is a including geographical, ecological, and environmental influences of Jeolla-do. Based on the results of the study, it is expected that it will provide basic data for sustainable forest management and maintenance, and it provides the needs to develop the site index curve suitable for present stand grown by the region in South Korea.

중학교 공기소총 사격선수의 12주간 호흡훈련에 따른 조준지속력과 득점에 관한 연구

조철훈(Cho Chul Hun),박지영(Park Ji Young),박세익(Park Se ik),박동숙(Park Dong Sook) 세계태권도문화학회 2012 세계태권도문화학회지 Vol.- No.4

This study is intended to provide basic data of the shoot instruction through breath drills by analyzing the effect of the breath drills for 12 weeks on the aim sustaining strength with a coaching machine (SCATT) developed as electronic system after modifying and complementing the breath drill program suitably for this study on the recognition of the importance of breath for shooters of a middle school, and the results of experiment and analysis for improving the athletic performance of shooters are as follows: As for the technical variable characteristics for the air pistol shooters of the middle school through the breath drills for 12 weeks, the total score of 9 shooters except for a person (HBS) was higher after the breath drill than before the breath drill, showing significant difference in scores. The aim time of shooters except for a person (KMY) was shorter after the breath drill than before the breath drill, showing significant difference in scores. The possibility (P10.0) of staying at 10.0 as technical variable characteristics for 10 shooters more increased after the breath drill than before the breath drill, showing significant difference in scores. The possibility (P10.5) of staying at 10.5 for 9 shooters except for a person (KWS) more increased after the breath drill than before the breath drill, showing significant difference in scores. The whole length of the moved aiming point was more reduced after the breath drill than before the breath drill, showing significant difference in scores. The difference of the aiming point was more reduced after the breath drill than before the breath drill, showing significant difference in scores. In the comparison by scoring level of technical variances, all variables such as the percentage rate (SP10.0) of the sustaining time stopping in a circle of 10.0 point after breath drills, the percentage rate (SP10.5) of the sustaining time stopping in a circle of 10.5 point after breath drills, the movement distance of the aiming point and the outburst were the highest for high scores (10.6~10.9 point). In addition, for the middle scores (10.2~10.5 point) and the low scores (below 10.1 point) groups, the outburst time appeared lengthily. As the result of performing the One-Way ANOVA analysis to review the effect of interaction of every technical variable for the scoring by scoring level of shooters after the breath drills, all variables showed significant difference from scores between groups. The analysis of simple relationship coefficients between scores and technical variable showed significant difference (**: P<.01) except for HBS and LJM of male air riffle shooters of the middle school after the breath drills for 12 weeks. The analysis of simple relationship coefficients between scores and technical variable showed significant difference (**: P<.01) except for KMY of female air riffle shooters of the middle school after the breath drills for 12 weeks.