• Journal of the Society of Naval Architects of Korea
• /
• v.28 no.1
• /
• pp.125-138
• /
• 1991

In this paper, an efficient method for the analysis of damage and strength of double bottom structure in stranding is described by using idealized structural unit method. Also a procedure for the determination of the effective double bottom height which is required in order to protect the inner-bottom plate is proposed. In the comparison between the present solution and he existing experimental and numerical results in stranding, its observed that the present method gives reasonable results requiring very shorts computiong times. The present method is then applied to the double bottom structure of 40K product oil carrier which is designed by the double skin design concept as an example. By performing the series of analysis, the influence of vertical member space, plate thickness and double bottom height on the energy absorption capacity of the double bottom structure in stranding is investigated. Also the minimum double bottom height with varying each design variable Is calculated based on the above result.

• The Journal of the Korea Contents Association
• /
• v.10 no.12
• /
• pp.10-17
• /
• 2010

In this paper, we design digital D-PHY link chip controling DSI (Display Serial Interface) that meets MIPI (Mobile Industry Processor Interface) standard. The D-PHY supports a high-speed (HS) mode for fast data traffic and a low-power (LP) mode for control transactions. For low power consumption, the unit blocks in digital D-PHY are optionally switched using the clock gating technique. The proposed low power digital D-PHY is simulated and compared with conven tional one about power consumption on each transaction mode. As a result, power consumptions of TX, RX, and total in HS mode decrease 74%, 31%, and 50%, respectively. In LP mode, power reduction rates of TX, RX, and total are 79%, 40%, and 51.5%, separately. We implemented the low power MIPI D-PHY digital chip using $0.13-{\mu}m$ CMOS process under 1.2V supply.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.14 no.4
• /
• pp.917-922
• /
• 2010

In this paper, a new temperature-insensitive CMOS dual-mode current reference for low-voltage low-power mixed-mode circuits is proposed. The temperature independent reference current is generated by summing a proportional to absolute temperature(PTAT) current and a complementary to absolute temperature(CTAT) current. The temperature insensitivity was achieved by the mobility and the other which is inversely proportional to mobility. As the results, the temperature dependency of output currents was measured to be $0.38{\mu}A/^{\circ}C$ and $0.39{\mu}A/^{\circ}C$, respectively. And also, the power dissipation is 0.84mW on 2V voltage supply. These results are verified by the $0.18{\mu}m$ n-well CMOS parameter.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.45 no.7
• /
• pp.38-44
• /
• 2008

In this paper, we introduce an low complexity and low power IR-UWB (impulse radio ultra wideband) baseband transceiver for wireless sensor network. The proposed baseband, implemented by TSMC 0.18um CMOS technology, has a simple structure in which a simplified packet structure and a digital synchronizer with 1-bit sampler to detect incoming pulses are used. Besides, clock gating method using gated clock cell as well as customized clock domain division can reduce the total power consumption drastically. As a result, the proposed baseband has about 23K digital gates with an internal memory of 2Kbytes and achieves about 1.8mW@1Mbps power consumption.

• Aerospace Engineering and Technology
• /
• v.9 no.1
• /
• pp.42-49
• /
• 2010

CSSA(Coarse Sun Sensor Assembly) is the essential sensor for satellite attitude control. CSSA measures the direction of the sun's rays and determines whether the satellite is in the eclipse or not. The paper shows the development process and test results of CSSA flight model for low earth orbit satellite. After analyzing the functional test results, we can make a decision whether the unit meets the requirements. We needs the definite and precision procedure and lots of experience. We could improve those through the development of Qualified Model for CSSA and so obtain the results to meet the functional requirement at the Flight model.

• Journal of Convergence for Information Technology
• /
• v.10 no.3
• /
• pp.92-103
• /
• 2020

This study agrees with the seriousness of the low birth phenomenon in our country and discusses the analysis of the causes of low birth and the establishment of the policy measures for early childhood education and child care in relation to the low birth phenomenon. In particular, the purpose of the policy is to establish a policy plan for up-to-down early childhood education and child care that can be reflected in the policy by members related to early childhood education, breaking away from the existing one for top-down child education and child care. To this end, the research was conducted using Delphi technique and 20 experts in the field of early childhood education and child care were organized into expert panels. In this study, seven policies were proposed for opportunity compliance, eleven policies for service compliance, eight policies for compliance with goods/gift certificates/tax reduction, seven policies for compliance with cash benefits, and five policies for compliance with power. We hope that the bottom-up education and childcare policy measures proposed in this study will provide specific implications and suggestions for resolving the low birth rate.

• Review of Culture and Economy
• /
• v.21 no.3
• /
• pp.3-30
• /
• 2018

The purpose of this study is to investigate the effects of participation in cultural activities on happiness. The empirical results show that participation in cultural activities has a positive impact on individual happiness, because cultural activities cause entertainment and social contacts with people. Furthermore, the levels of income and education are analyzed by dividing them into high and low groups. Noteworthy is that the low-income and less-educated groups show lower participation in cultural activities than those in the high-income and well-educated groups, But the utility magnitude gained through cultural activities is higher. This implies that opportunity costs arising from financial and time constraints are greater in the low-income and less-educated groups than in the high-income and well-educated groups. Finally, for the low-income group, the marginal utility is reduced when spending on cultural activities exceeds certain levels, which means there exist a budget constraint for the low-income group.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2009.05a
• /
• pp.671-674
• /
• 2009

We design a low-power and low-area asynchronous EEPROM of 256 bits used in a passive UHF RFID tag chip. For a low-power solution, we use a supply voltage of 1.8V and design a Dickson charge pump using N-type Schottky diodes with a low-voltage characteristic. And we use an asynchronous interface and a separate I/O method for a low-area solution of the peripheral circuit of the designed EEPROM. And we design a Dickson charge pump using N-type Schottky diodes to reduce an area of DC-DC converter. The layout area of the designed EEPROM of 256 bits with an array of 16 rows and 16 columns using $0.18{\mu}m$ EEPROM process is $311.66{\times}490.59{\mu}m^2$.

• Korean Journal of Food Science and Technology
• /
• v.53 no.6
• /
• pp.695-700
• /
• 2021

The purpose of this study was to prepare low-molecular weight collagen using a commercial proteolytic enzyme (Protamex) from collagen extracted from feet of Korean native chicken and to investigate the quality characteristics of this collagen. The collagen content of Korean native chicken feet was 13.9 g/100 g, which was higher than the 6.21 g/100 g of general broilers. It was found that the content of low molecular weight collagen increased as the concentration of proteolytic enzymes and reaction time increased. In particular, reaction with 1% Protamex for 7 h resulted in 55.6% of low molecular weight (1,000-5,000 Da) collagen content, and the average molecular weight was 5,390 Da. Regarding the texture of the enzyme-treated collagen, the collagen with high molecular weight peptides decomposed into low molecular weight peptides, and the gel type could not be formed, whereas the sol type was maintained.

• Journal of The Korean Association of Information Education
• /
• v.25 no.5
• /
• pp.761-768
• /
• 2021

Recently, various platforms and contents for artificial intelligence education have been developed, but artificial intelligence education programs for the lower grades of elementary school are insufficient. Therefore, the purpose of this study is to develop an artificial intelligence education program for learners in the lower grades of elementary school. It was designed using the Novel Engineering with various convergence education research cases for software education. After the first program was developed, it was verified by expert validity test, and the program was modified and developed accordingly. It was necessary to construct a program based on spoken language rather than written language in consideration of the level of learners in the lower grades in the process of acquiring Hangeul, and to secure the number of educational hours through integration between subjects. It is expected that this study can suggest a new direction for artificial intelligence education for elementary and lower grade learners.