• 마이크로전자및패키징학회지
• /
• 제29권1호
• /
• pp.1-6
• /
• 2022

The mobile device industry demands much higher levels of integration and lower costs coupled with a growing awareness of the complete system's configuration. A subsystem module package is similar to a board-level circuit that integrates a system function in a package beyond a System-in-Package (SiP) design. It is an advanced IC packaging solution to enhance the PDN and achieve a smaller form factor. Unlike a system-level design with a decoupling capacitor, a subsystem module package system needs to redefine the role of the capacitor and its configuration for PDN performance. Specifically, the design of package's form factor should include careful consideration of optimal PDN performance and the number of components, which need to define the decoupling capacitor's value and the placement strategy for a low impedance profile with associated cost benefits. This paper will focus on both the static case that addresses the voltage (IR) drop and AC analysis in the frequency domain with three specific topics. First, it will highlight the role of simulation in the subsystem module design for the PDN. Second, it will compare the performance of double-sided component placement (DSCP) motherboards with the subsystem module package and then prove the advantage of the subsystem module package. Finally, it will introduce three-terminal decoupling capacitor (decap) configurations of capacitor size, count and value for the subsystem module package to determine the optimum performance and package density based on the cost-effective model.

• 신재생에너지
• /
• 제19권4호
• /
• pp.84-97
• /
• 2023

This study aimed to investigate the feasibility and potential applications of utilizing bifacial photovoltaic (PV) panels from an architectural perspective. It also aimed to establish a foundational dataset for installation and operational guidelines for bifacial PV panels through a comparative analysis of energy production performance with single PV panels. The research encompassed several key steps, including a comprehensive literature review, calculation of solar surface radiation values, development of datasets for bifacial and single PV energy production, and a performance comparison between both approaches. The results of the study show that bifacial PV panels exhibit optimized energy production capabilities within the range of 40 to 80 degrees, contingent upon the specific installation location. Consequently, it is recommended that the installation of bifacial PV panels in Korea should primarily focus on southwest-to-west orientation. Furthermore, it was concluded that bifacial PV panels could contribute an equivalent or even superior level of energy production compared to single PV panels, even if their performance exhibited a marginally lower efficiency of 2% to 5% with an 18% power generation efficiency.

• Applied Microscopy
• /
• 제10권1_2호
• /
• pp.7-17
• /
• 1980

Electron microscope radioautography introduced by Liquier-Milward (1956) is now used routinely in many laboratories. Most of the technical difficulties in specimen preparation have been overcome. This method is modified from loop method for improvement of EM radioautographic techniques. The advantages of this method are: 1. the use of single specimens on small corks and of a large wire loop, allows the experimenter to avoid the blemishes in the membrane; 2. the surfactant dioctyl sodium sulphosuccinate is added to diluted ILford L4, thus greatly prolonging the period of time over which good emulsion layers can be made; 3. corks can be handled in perspex holder which allows about 20 specimens to be developed simultaneously. The steps of the method comprise: 1. Cut ribbons of ultrathin sections of silver interference colour 2. Pick them up on formvar-coated 200 mesh grids 3. Prestaining of tissues 4. Coat the specimens with a thin layer of carbon by evaporation (30-60A) 5. Mount the specimens on corks (about 1cm apical diameter) using double-sided scotch tape 6. Emulsion coating; a. Take a 250m1 beaker, place it on the pan of a sliding weight balance and weigh it. Add 10 grams extra to the beam. Add pieces of ILford L4 emulsion to the beaker until the balance is swinging freely. Add the 20ml of distilled water that was previously measured out. b. Surfactant dioctyl sodium sulphosuccinate is added to diluted ILford L4. 7. Prepare a series of membranes of gelled emulsion with the wire loop and apply one to each cork-borne specimen. 8. Put the specimens away to expose by pushing the corks into short length of PVC tubing, each tube having a small hole in the side 9. Place the tubes in small boxes together with silica gel. 10. Exposure 11. Developer - Kodak Microdol X for 3 minutes 12. Fixer - A perspex holder can be manufactured which allows 20 specimens to be developed simultaneously. 12. Fixer - 30% sodium thiosulfate for 10 minutes 13. Examination with Siemens Elmiskop 1A electron microscope

• 동서간호학연구지
• /
• 제13권2호
• /
• pp.118-129
• /
• 2007

Purpose: The purpose of this study was to examine how effective the existing sex education programs and letter to parents from school were for their know ledge and attitudes towards sex of the middle school students. Methods: Subjects were selected from first grade students in a middle school from May 30 through July 19, 2005. The subjects were divided into three groups of 70 students each, two experiment groups and one control group. The study was conducted by nonequivalent control group non-synchronized design. The information letter from school to parents was made into four editions on double-sided A4 size paper and was handed out to students during weekly meeting. Both the students and their parents were required to read it and the parents were told to sign the papers. The sex education program applied in this study was recomposed based on the programs which were previously made by Sun Hee Park(2004) and Eun Ja Jung(2000). Content provided in the sex education program is identical to the one's in the information letter to parents. Experimental group 1 was required to read the four information letters to parents for two weeks, together with their parents. Group 2 experienced the sex education program four times in two weeks of time. The above two experimental groups and the control group were assessed on their knowledge and attitude towards sex twice, before and after the experiment. Results: There were significant differences in sexual knowledge about sex between the three subject groups and such data supports the first hypothesis. There was significant difference in attitude towards sex between the three subject groups and such data support the second hypothesis. Conclusion: According to the experiment results, both the information letter to parents and programs about sex education were effective for the middle school students. Yet, teaching students with the program format was more successful than handout formats. However, using information letters to parents to educate students does not waste any school hours, so if school nurses can provide the students more papers, the educational effect will be greater.

• 한국주거학회논문집
• /
• 제25권5호
• /
• pp.83-91
• /
• 2014

The main purpose of this research is to understand how the problems, which existing letter-shape houses have, are solved in Unjoru which is one of the letter-shape houses. Furthermore, there is the secondary purpose which is to realize the architectural characteristics of Unjoru through the process from the composition of rooms and buildings to the method of structure and roof formation. This research was approached in terms of architectural design, and as the result, the problems of the existing letter-shape houses was resolved by literally converting the shape of outdoor space to 品-shape form. Moreover through the result, it was recognized that the 占-Shape plan was flexible in responding to the demand of the times, such as the order of precedency within men and women and each generation. In addition to the previous results, it was confirmed that the location of major rooms was also decided by considering the interrelationship with natural environment of surrounding area. Also, in the whole proportion of building's plan, each building, such as ㄷ-shape Anchae and big-sized and middle-sized Sarangchae having 丁-shape form, and major rooms in the each building have proportion system such as 1:1, 3:4, $1:\sqrt{2}$, and 3:5 as aesthetic numerical value. Finally, it was understood that the architectural intention had double-sided characters, one side was authority and dignity in the aspect of shape and another side was practicality in aspect of inner housing life.

• 대한한의학회지
• /
• 제20권2호
• /
• pp.3-11
• /
• 1999

The Korean system of health and medical care has been organized with both Oriental and Western medical sciences. To get complete clinical treatment results is not possible with only one-sided medical care, therefore we need to formulate an interdisciplinary plan for better health care, that is to say our ultimate purpose is the cooperative medical care for the promotion of social welfare and health. Hereupon, I made a searching inquiry into the present condition of cooperative medical care and its problems and also took a consideration into the medical state of other countries like China. Japan and North Korea where the Oriental medical care is used. The results of this investigation are as follows. There are some problems in both Oriental and Western(general) medical care, such as a lack of mutual confidence, a severance of interdisciplinary study, a shortage of professional human resources and so on. There also used to be problems of the system such as, the responsibility of medical care, the double charge for medical treatment, the governmental passive participation and policy, the private-oriented study system and so on. The solutions of these problems are that the mutual understanding and coexistence between both Oriental and Western medical sciences should be preceded and the interdisciplinary study, identified terminology and cooperative medical specialists would be necessary. Furthermore, the government has to seek some policies and legislation for the cooperative medical system and needs to support the public research institutes and centers of the cooperative medical care. After all, we have to train the cooperative medical specialists for the mutual aid of both Oriental and Western medical sciences and the government also has to support it with some policies and legislation for the better medical care system.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제32권3호
• /
• pp.272-278
• /
• 2006

Purpose: This study is designed to evaluate biocompatibility of three types of absorbable collagen GBR membrane in vitro. Material and Method: The human PDL fibroblasts culture was obtained through typical way and the cells used in the experiment was forth passage. The membranes examined were Experimental group A, B, C. All the 3-experimental groups were made of bovine pericardium and the membranes were excised into 5$\times$5mm respectively. The samples of the membranes were fixed on the 24-well plate with the double-sided adhesive tape. Then, 2ml of cell suspension which included $2{\times}10^4$cells was inoculated into the 24-well plate, and the cells were cultured for 1 week. Cellular viability and the alkaline phosphatase activity were measured with ELISA. The membranes in the culture were processed to examine with SEM. Results: The survival rate was highest in control and Experimental group A is the next, group B and group C in order of the value. The values are analyzed for statistical difference using Wilcoxon test. All the values of experimental groups are significantly lower than those of control, and the vaules among the experimental groups significantly differ from each other. Alkaline phosphatase level was identical order with the viable cell rate. SEM examination revealed that the PDL fibroblasts adherent on culture dish (control) and group A were spindle-shaped, but on group B and C, the cells were round-shaped without processes.

• 한국콘텐츠학회논문지
• /
• 제17권10호
• /
• pp.492-502
• /
• 2017

이 연구는 대중문화 콘텐츠가 초자연적 존재를 다루는 방식의 특징을 살피고, 한국의 신자유주의적 맥락에서 그러한 재현방식이 갖는 정치적 함의를 탐색하기 위해 텔레비전 드라마 <오 나의 귀신님>과 <싸우자 귀신아>를 사례분석 하였다. 두 텍스트를 분석한 결과, 첫째, 두 드라마의 내러티브에서 모두 일상성과 초자연성 사이에 명확한 경계를 설정하는 것으로 나타났다. 둘째, 초자연성은 텍스트가 제기하는 갈등요소의 경계를 확장함으로써, 사회적 현실의 난제에 대한 문제제기를 하는 데 효과적으로 사용되고 있다. 셋째, 갈등구조가 해소되는 과정에도 초자연성이 중요한 역할을 함으로써, 결국 내러티브를 리얼리티가 아닌 판타지에 경도되게 만든다. 이 결과에 따르면 대중문화 텍스트의 초자연적 존재 사용이 사회적 모순을 드러내고, 신자유주의적 담론질서에 대한 저항적 성격을 지닌다는 선행 연구의 주장은 조정될 필요가 있다. 특히 대중성이 강요되는 콘텐츠 장르의 특성은 텍스트의 저항적 잠재력을 크게 약화시킨다. 이런 결과는 초월적 존재를 다루는 대중문화 콘텐츠의 정치적 의미를 해석함에 있어 그 이중적, 양가적 효과에 주목해야 한다는 점을 말해준다.

• Nuclear Engineering and Technology
• /
• 제52권3호
• /
• pp.597-609
• /
• 2020

Accident Tolerant Fuels have been widely studied since the Fukushima-Daiichi accident in 2011 as one of the options on how to further enhance the safety of nuclear power plants. Deposition of protective coatings on nuclear fuel claddings has been considered as a near-term concept that will reduce the high-temperature oxidation rate and enhance accidental tolerance of the cladding while providing additional benefits during normal operation and transients. This study focuses on experimental testing of Zr-based alloys coated with Cr-based coatings using Physical Vapour Deposition. The results of long-term corrosion tests, as well as tests simulating postulated accidents, are presented. Zr-1%Nb alloy used as nuclear fuel cladding serves as a substrate and Cr, CrN, Cr_xN_y layers are deposited by unbalanced magnetron sputtering and reactive magnetron sputtering. The deposition procedures are optimized in order to improve coating properties. Coated as well as reference uncoated samples were experimentally tested. The presented results include standard long-term corrosion tests at 360℃ in WWER water chemistry, burst (creep) tests and mainly single and double-sided high-temperature steam oxidation tests between 1000 and 1400℃ related to postulated Loss-of-coolant accident and Design extension conditions. Coated and reference samples were characterized pre- and post-testing using mechanical testing (microhardness, ring compression test), Thermal Evolved Gas Analysis analysis (hydrogen, oxygen concentration), optical microscopy, scanning electron microscopy (EDS, WDS, EBSD) and X-ray diffraction.

• 복식
• /
• 제56권8호
• /
• pp.113-122
• /
• 2006

In this study, about forty teaching materials have been analyzed in order to examine tight skirt sewing methodtreated in basic process in a college and a fashion related educational institution. The study objects limited with a belt, back centered zipper, and back double slits on a tight skirt, and used fifteen suitable teaching materials in this study. The first study result appeared that every single teaching material suggested the different way of wick adhesion which is used in zipper slit, back slit, and belt part when the skit has been manufactured in order to do a form of clothes well. Secondly, it is the case of a back slit part used for the purpose of both functionality of action and decoration, and it is the section which varies a sewing and cutting way according to seam room width of a back middle seam. However, the majority of teaching materials appeared by being selecting the way how it had cut an inseam of the back center by the both upper part of back slit. Finally, the result showed that it mentioned mainly only both sided zipper sewing method if it seems to be easy to treat the majority in a basic process even though use of a console zipper Is general on a zipper sowing way recently for several years. Also, two forms are used in the belt manufacturing, and they are based with a waist line. However, the teaching materials that were used in this study presented only a manufacture way of the straight line on the waist belt.