• Korean Chemical Engineering Research
• /
• v.61 no.1
• /
• pp.116-122
• /
• 2023

We study the relationship of entropy with the properties of molecules and also with the macroscopic specifications of the system, i.e., component and phase. Understanding different viewpoints of classical mechanics and quantum mechanics for the indistinguishability of molecules belonging to the same component, we discuss a few thermodynamic systems in which the properties of molecules are to be consistent with the component as a macroscopic term of classifying the molecules. With a clear definition of thermodynamic microstate, the drawback of the Boltzmann statistics caused by the distinguishability of molecules is avoided, and the Gibbs paradox of entropy consequently disappears. Corresponding to the characteristics of fluid and solid phases, we investigated the effects of the indistinguishability and the symmetry number of molecules and the number of microstates realized in time on the partition function and the entropy. In particular, we show that crystalline solid can be regarded as a system which does not satisfy the ergodic hypothesis.

• (The)Study of the Eastern Classic
• /
• no.41
• /
• pp.121-148
• /
• 2010

The aim of this paper is to look into the characteristics and its value of Jo Uin(曺友仁)'s Jadosa(自悼詞). I compared Jadosa with other Yeongungasa(戀君歌辭) works for this purposes in the sides of aspect of Yeongunuisik(戀君意識) and emotionalism. Therefore Jadosa is equipped with space setting called the heavenly world and the earthly world, and has characteristics that a speaker of the earthly world misses a lover of the heavenly world. Also, Jadosa is similar to Samiingok(思美人曲) and Sokmiingok(續美人曲) of Jeong Cheol(鄭澈) because the former borrowed a few phrases and motifs from the latter. However, if I look into Jadosa in greater detail in the sides of emotion or attitude of a speaker, the speaker of Jadosa shows a reproachful attitude Unlike works of Jeong Cheol. And the speaker of Jadosa urges the lover to be aware of his illusion. Finally these differences occur as a political standing and a relation with the king is different in every writer. Accordingly This paper is very worthwhile through comparison of Jadosa and other Yeongungasa works given that I reviewed characteristics and a meaning of Jadosa.

• (The)Study of the Eastern Classic
• /
• no.68
• /
• pp.9-34
• /
• 2017

The purpose of this paper is to examine the unmanned life and poetic world of Ilong Choehuilyang. Choehuilyang is uninhabited and rarely left 227 poems and being recognized for his poetic achievements by later writers. Therefore, it would be meaningful to look at Choehuilyang's poetic world in the point of studying the unmanned poetry system. In Chapter 2, I looked at life as a base stage to understand Choehuilyang. Choehuilyang from his youth while studying at the age of 21, but turned to 武科. This is due to the gauntlet of the family who does not care about the 文武, Choehuilyang's grand physical condition and the resulting unattended temperament. Choehuilyang passed the exam in the past. And he won the war seven times under General Admiral Yi. However, when Admiral Yi Sun - shin was killed in Noryang, Choehuilyang returned to his hometown. After that, he died without going out until he was 92 years old. In Chapter 3, we examined Choehuilyang's spoetic world based on Chapter 2. Choi 's poetry can be divided into revealing the temperament of the unmanned, living peacefully in his hometown after returning home, and revealing his concern for the country. The poems revealing the unattended temperament are created by sensuous sheer or direct narrative when they are on the battlefield, when they watch the war after returning home. Peaceful life in Kangho was created in Naju, the hometown. And the poem that worried about the country was created by seeing the sick horan. I hope that the research that has been discussed so far will help to understand Choehuilyang's life and world.

• (The)Study of the Eastern Classic
• /
• no.69
• /
• pp.419-450
• /
• 2017

This study aims to discover the clue of the current modern postal system development by looking at the delivery patterns of Korean letters during the Joseon Dynasty. A letter is a text medium that the sender sends to a recipient by sending a message of news. The form and contents of the letter are influenced by the various surrounding factors and are adapted to circumstances. The study aims to clear up the method of delivery and the nature of the transmitter among the environmental factors which affects the format and contents of Korean letters. Depending on the public or private matters, the delivery method is divided into a public agency and a private messenger, or divided into one-phase delivery and the multi-phase delivery depending on whether or not a phase is divided into stages. It is also divided into a one-way and a round-transmission depending on whether or not it is round-switched. The transmitter is divided into a verbal communication, the letter and verbal communication, and the letter communication according to whether or not it is by verbal, and divided into the relational and the non-relational person according to the relationship with the sender. Also depending on whether the transmitter is exclusive or not, it is divided into the exclusive messenger and the messenger who deliver a letter incidentally while come and go. In the aspect of the delivery method, We can see the possibility of developing to a modern mail system through the public method, the multi-phase delivery, one-way delivery and in the aspect of the transmitter, we can see the possibility through the letter delivery, non-related transmitter, and the exclusive messenger.

• (The)Study of the Eastern Classic
• /
• no.70
• /
• pp.119-156
• /
• 2018

Suk Dang Kim Sangjeong (1722-1788) was one of the Big Three Noron literati of the mid-18th century, and is an author worth taking note of in that he expressed the duty to pursue the Qin-Han gomoon-ron (古文論) more clearly and radically than anyone else. The literary debates that unfolded in the letters he exchanged with Ahn Doje (安道濟) and Sin Daejeon (申大傳) are the clues that may explain the continual development of Qin-Han gomoon-ron within Joseon. His gomoon-ron is a self-reflection of the Dang-Song gomoon-ron that continued as tradition in the Noron literati after Kim Changhyeop (金昌協), and also reflects his literary and periodical confidence. At the same time, he also makes a distinction with Qin-Han gomoon-ron set forth by the Seven Masters literature from the Ming Dynasty (前後七子) in that he takes precautions against plagiarism and emulation. It has rarely been shown that his sentences plagiarize and excessively cite the classics, or that he abstrusely elaborates sentences. He sorted through things of value worth recording and cleanly reenacted them based on the scenes and conversations, further, delivered applicable normative lessons through allegoric writing. This may be discussed as the portions that are possessed by the Qin-Han gomoon-ron that he pursued, and particularly that have the esthetic and contact point of historical prose. Kim Sangjeong's writing pursued the Qin-Han gomoon-ron of a prior era, and though distinguishable from authors of difficult writings, possesses unique characteristics that make it distinct from the Dang-Song gomoon-ron that focuses on argument. The direction of Kim Sangjeong's antiquarianism seeks after imperial loyalty, and is mutually intelligible with the artistic discourse of the Noron Cheongryu literati such as Lee Yunyeong, Kim Sangsuk, Lee Insang, and Hong Naksun who preferred archaeological finds and classical prose. While their literary tastes are a reflection of their conservative worldviews, they may also have been utilized as a foundation supporting their lives which were devoted to literature.

• Korean Journal of Food Science and Technology
• /
• v.53 no.3
• /
• pp.304-312
• /
• 2021

The present study aimed to develop new physiologically active ingredients from Angelica gigas. The polysaccharides purified from A. gigas, AGE-2c-I, showed potent anti-complementary activity in a dose-dependent manner. C₃ activation products were identified through crossed immuno-electrophoresis using anti-human C₃ antibodies and the anti-complementary activity of AGE-2c-I under Ca⁺⁺-free conditions suggests that AGE-2c-I may induce complementary activation via both alternative and classical pathways. In addition, AGE-2c-I augmented the production of various cytokines, such as interleukin (IL)-6, IL-10, IL-12, and tumor necrosis factor-α, by peritoneal macrophages. Furthermore, intravenous (i.v.) administration of AGE-2c-I dose-dependently enhanced natural killer cell cytotoxicity against YAC-1 lymphoma. In experimental lung metastasis, prophylactic i.v. administration of AGE-2c-I inhibited lung metastasis by 58% at 100 ㎍/mouse. From the above results, we suggest that AGE-2c-I purified from A. gigas has potent immune system-stimulating activities, and is a potentially promising food ingredient beneficial to human health.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.47 no.5
• /
• pp.60-68
• /
• 2010

The calculation method of induction voltage is abbreviately by the Ohm's law including Carson-Pollaczek's equation for mutual inductance estimation and various shielding effect coefficients. This method is mainly scoped to 60㎐. power source and the inducing/induced object positioned on the air, and the dimension of shielding material is not thoroughly reflected. In this paper, more general method of calculation is scrutinized through electromagnetic wave propagation principles. Electromagnetic force as a voltage in the spot generating from the source is evaluated according to the position of the source and object, especially their relationship with earth surface as boundary line and independent to source propagation frequency. And this method intends to consider the material specification of each object in the induction field.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.31 no.1
• /
• pp.17-21
• /
• 2018

The natural frequency of a laminated cantilever microbeam was studied in the present investigation. The microbeam was made of quartz on a silicon chip, and its top and bottom surfaces were coated with thin(~30nm) gold films. An ultrasonic testing platform was employed to resonate the microbeam, and its time domain signal was optically measured. The natural frequency was quantified through the fast Fourier transform of the waveform, and the result showed good agreement with a theoretical estimation from the classical beam theory. This study is expected to provide a dynamic evaluation technique for micro/nanoscale materials and micromechanical structures.

• Korean Journal of Ecology and Environment
• /
• v.36 no.3 s.104
• /
• pp.375-380
• /
• 2003

For some decades eutrophication poses a great problem in water quality management in fresh-waters. To solve this problem, studies based on "bottom-up" hypothesis have been mostly carried out worldwidely unlike biomanipulation. This implies that not only fish but also fish stock playa key role down to other food web components in pelagic ecosystem. It is generally accepted that biomanipulation becomes a potent tool for eutrophication control. For a practical application of this, however, further development and understanding of the food web under the specific lake condition on a whole-lake scale are needed. The question is how can we maintain the positive effects resulted from biomanipulation (fortuitous or planned) for a long period.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.17 no.4
• /
• pp.50-56
• /
• 2003

It is well known that a partial-discharge(PD) in insulation oil is the source of various physical and chemical phenomena, such as heat, light, gas, chemical transformation, electric current, electromagnetic radiation and ultrasonics. The PD can be detected by measuring one of these changes. Although some techniques are employed in this purpose, several obstacles interfere with an on-line measurement. Ultrasonic-wave detection is a useful method for the diagnosis of the transformer-insulation condition. Conventionally, ulyrasonic waves are detected by Piezo-electric transducer, but we use optical method that has many advantages. In this paper, we constructed a Mach-Zehnder interferometer with optical fiber and investigated the principle of operation. Test arrangement is based on the needle-plane electrode system in oil and applied AC high voltage. Ultrasonic waves were detected and analyzed with wavelet transform.