• Journal of Christian Education in Korea
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• v.67
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• pp.77-116
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• 2021

The purpose of this study is to argue that religious maturity is necessary for the healthy life of the aged of Korean churches in the rapidly aging society. It is also to suggest educational method for the formation and development of a positive image of God for relations with God, which is essential factor in religious maturity. To this end, this study argues that the direction and task of senior education should be religious maturity through the search for prior research on church education of senior citizens. This study also looked at the variables involved in how religious maturity affects many areas of human life. To achieve the task of religious maturity, the biblical and theological concept of maturity and religious psychological concepts of maturity are summarized, and the concept of God's image for relations with God, which is important in religious maturity, and the variables related to mature human life are examined. This study was proposed methods of church education for the formation and development of a positive image of God in order to have the right relationship with God for the religious maturity of the elderly on intellectual, emotional and behavioral levels. In the intellectual aspect, it was proposed to educate the concept of biblical and theological God and and to educate the elderly to recognize themselves as beings that need to grow and mature in order to constantly establish relationships with God. In the affective aspect, it was proposed to educate the elderly to reflect on and identify the origin and formation process of God's image and to heal their distorted God's image with an educational counseling approach. In the behavioral aspect, it was suggested to educate their roles of faith education for the next generation as parents and grandparents and to educate using educational methods that induce them to practice their relationship with God to appear in daily life.

• International conference on construction engineering and project management
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• 2009.05a
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• pp.794-799
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• 2009

The temperature control of in-place concrete is the most important factor for an early age of curing concrete. Heat stress of mass concrete caused by the heat of hydration can induce the crack of concrete, and a frost damage from cold weather casting concrete results defect on compressive strength and degradation of durability. Therefore, success and failure of concrete work is dependant on the measurement and control of concrete temperature. In addition, the compressive strength assessment of in-place concrete obtained from the maturity calculated from the history of temperature make a reduction of construction cycle time, possible. For that purpose, wireless temperature measuring system was developed to control temperature and assess strength of concrete. And, it was possible to monitor the temperature of concrete over 1km apart from site office and to take a proper measure; mesh-type network was developed for wireless sensor. Furthermore, curing control system that contains the program capable to calculate the maturity of concrete from the history of temperature and to assess the compressive strength of concrete was established. In this study, organization and practical method of developed curing control system are presented; base on in-place application case.

• Proceedings of the Korea Concrete Institute Conference
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• 1995.04a
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• pp.274-279
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• 1995

The heat of hyderation of cement causes the internal temperature rise and volume change at early age, paticular in massive concrete structures. As the results of the temperature rise and extenal restraint conditions, the themal stress may induce cracks in concrete. Therefore various techenuques of the themal stress control of the mass concrete has been widely used. One of these techniques is pipe-cooling which is considered in this study. The objective of this paper is to develop finite element program which is capable of simulating the temperature history and the thermal stress considering pipe-cooling, creep and the modified elastic modulus dud to maturity effect.

• Journal of the Korea Concrete Institute
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• v.16 no.1 s.79
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• pp.125-129
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• 2004

Hydrating concrete pavement is typically subjected to temperature-induced stresses that drive cracking mechanisms at early concrete ages. Undesired cracking plays a key role in the long-term performance of concrete pavement systems. The loss of support beneath the concrete pavement due to curling caused by temperature changes in the pavement may induce several significant distresses such as punch out pumping, and erosion. The effect of temperature on these distress mechanisms is both significant and intricate. Because thermal conductivity dominates temperature flow in hydrating concrete over time, this material property is back-calculated by transforming governing equation of heat transfer and test data measured in laboratory. Theoretically, the back- calculated thermal conductivity simulates the heat movements in concrete very accurately. Therefore, the back- calculated thermal conductivity can be used to calibrate concrete temperature predicted by models.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.3 no.1
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• pp.19-26
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• 1970

During the summer of 1969, a series of experiments on the spawning and development of the eggs of grass carp and silver carp was performed with the following results, but the complete development of eggs Iras not accomplished: 1. The season of maturity for both species is estimated to be from the end of June to the beginning of August. 2. Pituitary glands for the use of inducing maturation should be obtained before the maturation season of its donor. 3. Silver carp as small as 40 cm in body length (48 cm in total length) with an age of 6 years were found to have reached maturity, and the number of eggs in the ovaries were from about 23 to 26 thousand for those with body lengths of 40-44.5 cm. 4. The conical-shaped net cloth incubator worked better than others, and each incubator was most effective when installed in parallel series to the water supply pipe with a valve for each incubator to control water flow. 5. During the egg development, if any cell or cells were displaced, the eggs eventually died. 6. The proper manipulation of brood fish before the egg-taking seems to be very Important, and close care should be paid to feeding them well and keeping them in a pond of proper water depth.

• Journal of Aquaculture
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• v.21 no.3
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• pp.146-156
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• 2008

Tributyltin chloride(TBTCl) was administered through discrete immersion(2 hr each) from the $18^{th}-25^{th}$ day after hatching(dph). At the doses of 1, 2, 4 and 8 ${\mu}g/L$, the immersion at 2 ${\mu}g/L$ ensured 93% masculinization and the highest survival of 75% after the treatment. TBTCl acted as a growth suppressant and the magnitude of its suppression was stronger in females. During the 300 day experiment, it postponed sexual maturity of females from 120$^{th}$ dph in the control to 240$^{th}$ dph in the females treated at 8 ${\mu}g/L$. It reduced spawning frequency(22-3 times) and cumulative fecundity(1,632-19 eggs) by reducing the number of vitellogenic eggs. In the treated males too, it reduced sperm motility(100-68 sec); consequently, fertilizability of the sperm cells drawn from these males was also reduced from 88 to 43%. Progeny testing showed that the cross between males treated at>2 ${\mu}g/L$ and normal females generated the presumed 'homogametic' males. Both the treated 'homogametic' and 'heterogametic' males could induce the females to spawn fewer eggs than that of the normal males. A normal female somehow deducted the differences between the control, treated and sex reversed males; it preferred a normal male over a treated one, and a treated one over the sex reversed male.

• Korean Journal of Poultry Science
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• v.20 no.4
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• pp.209-216
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• 1993

This study was conducted to classify Korean native chicken(KNC) and imported chicken by phenotypic performances and DNA fingerprinting. Two lines, KNC and White Leghorn(WL) , of chicken were maintained in the laboratory of Yeungnam University. Economic traits (body weight, sexual maturity, hen-day egg production, egg weight) and phenotypic characteristics (body-type, head, feather, shank) were checked. The DNA fingerprinting was analyzed for both breeds. The growth rate of the KNC was similar to WLS and sexual maturity of the KNC came later than WL. Hen-day egg production of the KNC was also slightly lower than the WL. The egg weight was about 10g lighter than WL. There was no difference in body weight of female KNC compared to the WL after 28 weeks. The study confirms difference between KNC and WL in DNA fingerprinting as well as its outlook. Thus, we suggest that these should be tested in nationwide districts about chickens known as the KNC using DNA fingerprinting. Then, the confirmed KNC populations should be maintained and used for the genetic improvement. Finally, only confirmed KNC should be in market which induce consumer to seek the KNC by its favorite.

• Korean Journal of Ichthyology
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• v.36 no.3
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• pp.209-219
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• 2024

A survey was conducted in 2011 to investigate the reproductive ecology and spawning behavior of the natural monumental and endangered species, Cobitis choii. C. choii exhibits sexual dimorphism with the development of lamina circularis on the second pectoral fin ray in males at one year old, facilitating easy differentiation between males and females. A total of 1,288 females and 881 males were collected from January to December, resulting in a sex ratio of 1 : 0.68. The spawning season was estimated to be from late June to early July (spawning peak from late June, with water temperatures ranging from 22 to 25℃), coinciding with a sharp decrease in the condition index. Gonadal maturity was observed with maturity indices of 17.5±2.11% for females and 2.9±0.46% for males, with fecundity of 2,444±838 eggs and egg size of 0.75±0.05 mm. Spawning behavior was induced by hormone injection (Human Chorionic Gonadotropin, HCG) in laboratory conditions. Experimental results revealed that males and females paired in a 1 : 1 ratio before spawning. Males pressed the abdomen of females using their lamina circularis to induce spawning, followed by immediate fertilization. Spawning behavior was repeated 15 to 25 (average 20) times per pair of males and females, and 80 to 120 eggs were spawned per time, and the total amount of spawned eggs were 2,500±250 on average.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.12
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• pp.7-14
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• 1972

Four treatment leveles(check 500, 1, 000 2, 000ppm) of Ethrel were applied to barley and wheat grown in greenhouse and fields at three stages (preboot, boot, afterboot) of growth in orderd to induce male sterility and to evaluate possibility of practical $F_1$-hybrid-seed production as gametocide. The results are summarized as follows. 1. The shortening plant height, especially the first internode length. spike length and decreasing 1, 000 seeds weight and induction of male sterility, were observed with all Ethrel theatments. The earier the stage of spraying at the boot and the higher concentration of Ethrel, the greater effects were observed. 2. The most practical level of inducing male sterility occurred ranging from 1, 000-2, 000ppm applied at all stages, while with increasing maturity, greater concentration of Ethrel were required to induce the same level of male sterility. .3. Great differences for male sterility per spike in bagged and unbagged spikes were shown with all treatments indicated ovary receptiveness, and that out-crossing has taken place, 4. Ethrel treatment induced more practicable extent of male sterility in barley than wheat. This results indicated that $F_1$-hybrid-seed production in barley with gametocide appears feasible if high combining ability lines were selected for increased out-crossing ratio. 5. There seemed to be no indication of additive surfactant influence on the Ehrel action in the present studies, and showed an interest on further studies on this matter.

• The Journal of Fisheries Business Administration
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• v.37 no.3 s.72
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• pp.45-63
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• 2006

A number of public loans with lower interests and other tax benefits have been provided for farmers and fishermen. However, much of those loans have been accumulated as non-performing. The result is that a large part of fisheries debts are now on the verge of default, Those loans, that fail to pay interests, keep rapidly growing like a time bomb. Now something has to be done before it burst. Firstly, the government must clean up the debts caused by government's mismanagement in the past. The past debt must be repaid or written off by the government since its guarantee was committed several times in guidelines regarding public loans. As such a measure, the government can greatly enlarge its capital contribution to the Credit Guarantee Fund for Farmers and Fishermen and Loss Guarantee fund for Policy Loan. It would greatly help to compensate local branches of fisheries cooperatives for their loss incurred from carrying public loans. In the past, the government used to roll over old debts of fishermen with new debts whenever maturity came. It ends up growing the size of non - performing loans. For this reason, it is not delay of the debt payment, but its write - off that fishery society needs a lot. Secondly, the loan authorities must lower overall risk in providing public loans for fishermen in the future. The whole process must be thoroughly reviewed and changed to provide and manage government loans. To facilitate this, fisheries cooperative must stop being just a public agent, rather take a bigger responsibility in selecting, and checking loan beneficiaries, and securing debt repayment. Incentives must be arranged properly enough to induce fisheries cooperatives to treat public loans just like their own business. Finally, the so - called 'special account of policy loan in fisheries industry' must be set up to enhance the transparency and to check the performance of public loans programs.