다도해 해상국립공원 대흑산도의 상록활엽수림 식생구조

조영준 ( Cho Yeong-jun ),김하송 ( Kim Ha-song ),명현호 ( Myeong Hyeon-ho ),박정원 ( Park Jung-won ),오장근 ( Oh Jang-geun ) 한국도서(섬)학회 2017 韓國島嶼硏究 Vol.29 No.1

This research was carried out from April of 2014 to January of 2017 in the evergreen broad-leaved forests around Daehuksan Island in Dadohaehaesang National Park. A total of 38 plots were set up in this study area, and plant communities were divided into 8 communities of Castanopsis cuspidata var. sievoldii community, Castanopsis cuspidata var. sievoldii-Pinus densiflora community, Pinus densiflora-Castanopsis cuspidata var. sievoldii community, Castanopsis cuspidata var. sievoldii-Pinus thunbergii community, Pinus thunbergii-Castanopsis cuspidata var. sievoldii community, Machilus thunbergii community, Quercus acuta community and the Camellia joponica community. Overall, in order to extract vegetation units based on the vegetation ecological information of the evergreen broad-leaved forest in Korea Peninsula, a comparasion study was conducted. The distribution area, habitat characteristic and its main distribution of Castanopsis cuspidata var. sievoldii community, Machilus thunbergii community, Quercus acuta community and the Camellia joponica community were compared for this study. The investigated Castanopsis cuspidata var. sievoldii community is a community identified by the Castanopsis cuspidata var. sievoldii. It forms a community in the southwestern slope and valleys of the Daehuksan Island Yeri, Sari, Simri and Sorasi village. The investigated Machilus thunbergii community is a community identified by Machilus thunbergii. It forms a community in and around towns, mostly in Daehuksan Island Yeri, Sorasi and the Mari village. The investigated Quercus acuta community is a community identified by Quercus acuta, and it forms a community in the top of Mt. Munam and the upper part of Viri village. The investigated Camellia joponica community is a community identified by Camellia joponica, and it was distributed around Daehuksan Island Sari, Simri village, and lowlands and the hilly area. However, there were many areas where tree vegetation was disterbed due to human interference. The actual vegetation map produced by the main evergreen broad-leaved forest communities represented the survey area. The main evergreen broad-leaved forest communities represented in the vegetation map were divided into Castanopsis cuspidata var. sievoldii community, Castanopsis cuspidata var. sievoldii-Pinus densiflora community, Pinus densiflora- Castanopsis cuspidata var. sievoldii community, Castanopsis cuspidata var. sievoldii-Pinus thunbergii community, Pinus thunbergii-Castanopsis cuspidata var. sievoldii community, Machilus thunbergii community, Quercus acuta community and the Camellia joponica community. The area of evergreen broad-leaved forest in Daehuksan Island is 58.0% of the total forest area.

다도해해상국립공원 대흑산도의 상록침엽수림 식생구조

조영준 ( Cho Yeong-jun ),김하송 ( Kim Ha-song ),명현호 ( Myeong Hyeon-ho ),박정원 ( Park Jung-won ),오장근 ( Oh Jang-geun ) 한국도서(섬)학회 2018 韓國島嶼硏究 Vol.30 No.1

This research was carried out from April 2014 to January 2018 in the evergreen coniferous forest around Daehuksan Island in Dadohaehaesang National Park. A total of 77 plots were set up in this study area and the plant communities were divided into the following 14 communities : Pinus thunbergii community, Pinus thunbergii -Eurya japonica community, Pinus thunbergii-Camellia japonica community, Pinus thunbergii-Castanopsis cuspidata var. sieboldii community, Pinus thunbergii -Machilus thunbergii community, Pinus thunbergii-Pinus densiflora community, Pinus thunbergii -Eurya emarginata community, Pinus densiflora-Castanopsis cuspidata var. sieboldii community, Pinus densiflora-Machilus thunbergii community, Pinus densiflora -Camellia japonica community, Pinus densiflora-Eurya japonica community, Pinus densiflora-Pinus thunbergii community, Pinus densiflora-Carponus turczaninowii community, and Pinus densiflora community. In the case of dominant species studied in Daehuksan Island, Pinus thunbergii forest was dominated by the dominant species Pinus thunbergii community, Pinus thunbergii -Eurya japonica community, Pinus thunbergii-Camellia japonica community, Pinus thunbergii-Castanopsis cuspidata var. sieboldii community, Pinus thunbergii -Machilus thunbergii community, Pinus thunbergii-Pinus densiflora community, Pinus thunbergii -Eurya emarginata community, and Pinus thunbergii-Mallotus japonicus community. The investigated Pinus thunbergii community is a community identified by Pinus thunbergii, and it formsa community on coastal hillsides and southwestern slopes mainly in the Daehuksan Island Jinri, Eupdong, Mari and Sorasi village. In the case of dominant species studied in Daehuksan Island, Pinus densiflora forest was dominated by the dominant species Pinus densiflora-Castanopsis cuspidata var. sieboldii community, Pinus densiflora-Machilus thunbergii community, Pinus densiflora -Camellia japonica community, Pinus densiflora-Eurya japonica community, Pinus densiflora-Pinus thunbergii community, Pinus densiflora-Carponus turczaninowii community, and Pinus densiflora community. The investigated Pinus densiflora-Castanopsis cuspidata var. sieboldii community is a community identified by Pinus densiflora and Castanopsis cuspidata var. sieboldii, and it is clustered around the villages of Daehuksan Island Jinri, Yeri, Simri and Chilrak mountain and the Northeast slope. In Daehuksan Island, Pinus densiflora community and Pinus thunbergii community are mixed with evergreen broad-leaved forest, and natural transition occurs according to the ecological competition of these communities. The most important dominant species in the tree layer are Castanopsis cuspidata var. sieboldii, Machilus thunbergii, Pinus densifloraandPinus thunbergii. The most important dominant species in the subtree layer are Castanopsis cuspidata var. sieboldii, Eurya japonica, Camellia japonica, Machilus thunbergii, and Mallotus japonicus. The actual vegetation map produced by the main evergreen coniferous forest communities represented the survey area. The main evergreen coniferous forest communities represented in the vegetation map were divided into Pinus densiflora -Carpinus turczaninowii community, Pinus densiflora-Castanopsis cuspidata var. sievoldii community, Pinus thunbergii-Camellia japonica community, Pinus thunbergii-Castanopsis cuspidata var. sievoldii community, Pinus densiflora-Camellia japonica community, Pinus thunbergii-Eurya japonica community, Pinus thunbergii-Machilus thunbergii community, Pinus densiflora community, Pinus thunbergii community, and Pinus densiflora-Machilus thunbergii community. The area of evergreen coniferous forest in Daehuksan Island is 43.52% of the total forest area.

유아의 수개념 학습을 위한 시뮬레이션형 학습 모델의 설계

박영태,김준규 東亞大學校 學生生活硏究所 2000 學生硏究 Vol.26 No.-

The purpose of the study designed a simulational instructioil mode1 for problem solving learning applying the situational simulation and process simulation to the technique for developing situational learning coursewares based on constructivism. The follow conclusions were obtained from the results of the study. First, there's require simulation model based constructivism instructional theory. Second, we first studied and analyzed characteristics of infants. Third, we established a learning model with which infants might effectively learn numerical concept and developed a courseware in the basis of it. Fourth, in this model, the learner can explore his own path for himself. Fifth, the numeric concept simulation model consists of one simulators, such as polygon classfication, comparison, seriation, a helping room. Sixth, simulation model should be designed to be self- directed learning. Finally, the simulators are designed for a learner to get experiences just like in a real world. The helping room provides the basic concepts needed for simulation.

치과주조용 Ti-Zr-Cr계 합금에서 Cr 함량변화가 부식저항성에 미치는 영향

박영준,강후원,이용렬,송호준,김민강 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

The purpose of this study was to develop new dental casting titanium (Ti) alloys having an excellent mechanical properties and good corrosion resistance as a substitute for c.p Ti and Ti-6Al-4V alloy (control groups). Ti-20Cr, Ti-2OZr and Ti-20Zr-XCr (X=2, 5, 10, 15) alloys (experimental groups) were designed for dental casting Ti alloys. Prior to casting prccedure, mother alloys were prepared by using vacuum arc melting with skull melting method. Argon-arc melting and argon/vacuum-pressure casting machine were used for making the specimens. The hardness, microstructure, and corrosion resistance were evaluated by using Vickers microhardness measurement, FE-SEM, and anodic polarization test. The results were as follows: 1. The Vickers microhardness (Hv) of Ti and Ti-6Al-4V alloy showed the values of 210 and 352, and Ti-20Cr and Ti-20Zr alloys showed the values of 341 and 259, respectively. As the Cr content increased from 0 to 15 % in Ti-20Zr-XCr (X=0, 2, 5, 10, 15) alloys, the Hv increased from 259 to 298, 457, 344, and 351, respectively. The microstructure of Ti-20Zr-XCr specimens showed significant difference by the concentration changes of Cr content showing acicular crystalline structure for Ti-20Zr-2Cr and Ti-20Zr-5Cr, and equiaxed crystalline structure for Ti-20Zr-10Cr and Ti-20Zr-15Cr. 2. Open-circuit potentials (E_(∝)) were rapidly decreased followed by steadiness as time elapse in all experimental groups except in Ti-20Z group. Ti-2OZr group showed an increase in E_(∝), from the first. 3. In potentiodynamic anodic polarization tests, all experimental groups showed more noble corrosion potential (E_(corr) than that of Ti-6Al-4V, and more basic E_(corr) than that of Ti. Especially, Ti-20Zr-10Cr alloy showed most favorable corrosion resistance among Ti-Zr-Cr alloys. 4. For Ti-20Zr-10Cr, Ti-20Zr-15Cr, and Ti-20Cr groups, which have more than 10% Cr content, the secondary corrosion potential shifted to noble direction in larger amounts than in the cases of control and other experimental groups. From these results, it was concluded that newly formulated Ti-20Zr-10Cr experimental alloy have adequate hardness and high corrosion resistance, and this alloy is promising candidate for a successful dental casting alloy.

양극산화와 열산화 처리로 형성된 티타늄 산화막의 표면 특성과 생체활성에 관한 연구

박영준,송호준,이용렬 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

The purpose of this study was to evaluate the surface characteristics of titanium oxide films formed by anodization and thermal oxidation techniques, and to investigate its effects on formation of calcium phosphate. As experimental specimen groups, naturally oxidized film (AS-R), thin anodic oxidation film (ANO-L), thick anodic oxidation film (ANO-H) treated up to dielectric breakdown voltage, and thermal oxidation films of TH-L and TH-H treated at 530℃ and 800℃ in the air, respectively, were prepared. Surface characterization was performed using field emission-scanning electron microscopy (FE-SEM), X-ray diffractometry (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) in order to evaluate the micro-morphology, crystalline structure, chemical composition, and binding structure of the oxide films. Bioactivity of specimen groups was investigated by evaluating the degree of calcium phosphate formation after immersing the samples in MEM for 7 days. The results were as follows: 1. Nanometer sized granular oxide particles were distributed on the surface of TH-L samples and sub-micrometer sized large crystallites were formed on TH-H samples. Irregularly shaped oxides were observed in ANO-L, and homogeneously porous oxide film having average pore size of about 0.5 ㎛ was formed in ANO-H. 2. Titanium oxide films having anatase crystalline structure were formed on ANO-L and TH-L sample surfaces. However, the preferred orientation crystal planes of ANO-L and TH-L were different to be (101) and (004) plane, respectively. Rutile crystalline structure was dominantly shown on TH-H sample, and anatase and rutile crystals were co-existed on ANO-H sample surfaces. 3. The amounts of hydroxyl group, which is related to the bioactivity of titanium implant, were higher in thermally treated specimen groups than in other groups. This result was analyzed to have close relation to the preferred orientation crystal plane and surface area of oxide films. The content of hydroxyl group increased as the density of surface titanium atoms increased, and that was least in specimen group having rutile and anatase crystalline structure in coexistence. 4. Immersion test in MEM showed that the capacity of calcium phosphate formation was dependent on total content of hydroxyl group and surface morphology of titanium oxides.

유아의 초인지 계발을 위한 컴퓨터 시뮬레이션 개발

박영태,김준규 동아대학교 학생생활연구소 2001 學生硏究 Vol.29 No.-

The purpose of the develop a computer simulation model for improve of metacognition of infant The follow conclusions were obtained from the results the study. First, there's require simulation model based computer program fidelty. Second, in this model, the learner can explore his own path for himself. Third, we first studied and analyzed characteristics of infants. Fourth, we established a learning model with which infants might effectively improvement metacognition. Fifth, simulation model should be designed to be self-directed learning. Finally, the simulators are designed for a learner to get experiences just like in a real world. The advice room provides the basic concepts needed for simulation.

태양열 집열기용 평판 히이트파이프의 전열예측

박춘근,전철호,장영석 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

The purpose of the research is to study the prediction of heat transfer on flat heat pipe applid to solar energy collector by the numerical study. Numerical analysis was performed by finite element method for the prediction of heat transfer on flat transfer on flat heat pipe. A comparison between the experimental and the numerical results show qualitatively agreement and it was able to predict the performence of flat heat pipe collector. The Biot number, (h_(ev)l)/Ks in order to know the effect of heat transfer on flat heat pipe was show to decrease by increas of heat transfer coefficient in vapor region, and with higher conductivity of container, Ks.

한국 금융기관의 시설경비·경호 현항과 개선방안

박준석,최진영 龍仁大學校 武道硏究所 2004 武道硏究所誌 Vol.14 No.2

In this paper, examine present status of financial institution s facility in USA and Japan which are known as advanced countries of private security industry, and analyze face subject and controversial points. And then, grope improvement plan for efficient security and problems of Korean financial institution s security. As results of study, for improved self-security of financial institutions, followings are the financial institution self-security plans and confrontation plan of private security companies. First, among the financial institutions, crime is increasing to community bank which security is vulnerable relatively than major banks. This is evidence that advanced security equipments are effective to control the will of crime. Therefore, financial institution should install advanced security equipments under the sense of duty that manage customer s property safely by oneself, and cooperate with private security company for better crime prevention activities. Second, criminals are usually propel crime at opening, changing time at lunch, and at closing hour. Because, employees of financial institution are not paying much attention in those loose time. Therefore, non-window personnel s supports are must be provided to make circumstance that window personnel works at right position certainly when starting time or shifting time. Third, when crime is occurred, non-window personnel must issue alarm quickly and request cooperation of the police or private security company. Especially, one of the important suggestion by this paper is that alarm should be issued to in and out side of financial institution along with the police and private security company and establish citizen arrest system which helps arrest criminals by citizen or related agents in neighbor area. Fourth, Security must be managed as multiple system such as automatic alarm device on building walls and vault to issue the alarm when there are unusual noises or vibration of vault because in case of single alarm he, F criminals cut off the alarm line, it could be open state to crime. So, must establish multi alarm system and make criminals not to accomplish crime by delaying entry time. Fifth, to customer who withdrawal cash or check more then certain amount, escort service should be introduced and escort to destination safely as customer protection system even if customer does not ask for. And Followings are confrontation plan of private security companies. First, confrontation ability at initial stage is not enough. Under current security system, it is very hard to reach the spot with crime time even If go out as fast as possible. Therefore, manage manless automatic monitor system thoroughly and set multi-channel warning system so that alarm may issue around police station or private security' company as well as banking facilities neighborhood in case of panic button is pressed in window, and must grope plan of total citizen criminal prevention system that can request neighborhood inhabitants' cooperation. If systematic and synthetic management is accomplished in window, crime can be prevented in some degree. In other words, most of crime at window can be prevented by alarm management system at window, cooperation system with professional security agents and insuring window security agents, etc. Second, securing professionalism of professional security team is urgent. Most of private security company's manpower are not qualified, and it is that they are not much helpful when actual situation occurred. Also, it is truth that their role is limited to carry out preventive patrol activity. Therefore, professional training and education to financial facility staff is required. Moreover, should recruit specially trained manpower at military or police, and it is necessary to consider plan that confront properly in initial state of crime. And the most important thing is holding back criminal's crime wills thru security staffs periodic and systematic confrontation training abut financial facilities crime. Third, professional security school is necessity to educate and train private security staff by each fields. As a plan to this idea, utilizing education and training system of existing school or military, and newly establish professional education and training institute to cultivate professional security staffs. Especially, for financial facility, must aim at operation of the most advanced security equipments. And for cash-in transit vehicles, must used wireless transmitter equipped vehicles and bags obligatorily, so that it is possible to trace the location when it is robbed.

민간영리 스포츠 시설로서의 수영장의 라이프 사이클과 경영전략에 관한 연구

윤영복,박준희,정용준 조선대학교 사범대학 부설 교과교육연구소 1998 敎科敎育硏究 Vol.1 No.1

We made a research on the sports facility managers who manage the commerical swinning center in seoul, Kwang Ju, Pusan and Taegu, The results are as follows: (1) The competive strategy of swimming center consists of inner-differentiation strategy, out-differentiation strategy and low cost strategy. (2) Inner-differentiation strategy is emphasized by the swimming center which sets the goal for growth maintenance. (3) Competitive stratgy of swimming center is dertermined by each stage in the life cycle theory ① Introduction stage : The emphasis of strategy is laid on inner-differentiation strategy. ② Growth stage : The emphasis of strategy is laid on both inner-differentiation strategy and out-differentiation strategy ③ Decline stage : The emphasis of strategy is laid on out-differentiation strategy with the aim to maintain.

치과용 고무인상재의 영구변형 및 압축시 변형률

전창주,김준철,정석민,박영준 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.1

This study investigated the permanent deformation of dental rubber impression materials in order to evaluate their degree of recovery from displacement during removal through undercut area. We also investigated the stain in compression in order to evaluate the materials' flexibility during removal from the month, or during removal of the cast from the impression. Additional silicone, polyether, and polysulfied rubber impression materials were tested for their properties of permanent deformation and strain in compression according to the testing methods of the ADA specificaltion no. 19. 1.The permanent deformation values were as follows: polysulfide (2.25%), polyether (2.14%), and additional silicone (0.28∼1.21%, 2.38% for Perfect F). Examix, Express and Provil, which are additional silicone rubbers, showed lower permanent deformation values of 0.29%, 0.28% and 0.34%, respectively. Perfect F, although it is an additional silicone rubber, showed the highest permanent deformation value (2.38%) within the tested materials. 2.The strain in compression values were as follows: polysulfide (10.63%), additional silicone (2.88∼10.09%), and polyether (2.38%). The additional silicone rubber samples showed various values. Contrary to our expectations, it is also notable that Vinylate, which is used when taking an one-step impression, had higher stain in compression value (10.09%) than the light body impression materials even though it is classified as a heavy body material. Express (a.s.) had a low strain in compression (2.88%) which is similar to that (2.83%) of Impregum F (p.e.). In light body rubber materials, Permlastic had the highest value (p.s. 10.63%), followed by Perfect F (a.s. 7.38%), Correct VPS (a.s. 7.13%), Examix (a.s. 6.04%), Provil (a.s. 3.82%) and Express (a.s. 2.88%). Although the tested materials showed various values, all of them satisfied the requirements of A.D.A. Specification No. 19, which require that permanent deformation be less than 2.5%, and strain in compression be between 2∼20%.