사이클 모사 프로그램을 이용한 대체냉매 냉동공조 시스템의 열역학적 해석

박량한,김영재 한국공업화학회 2004 응용화학 Vol.8 No.2

The system air-conditioner, which has one outdoor unit connecting several indoor unit units, can provide more energy saving and better environmental conditions than the conventional air-conditioning systems. But it is difficult to experimentally analyze behaviors of system air-conditioners due to various load conditions and combinations of indoor units. Therefore, it is important to develop a cycle simulation program for predicting the performance of system air-conditioners without complex experiments. The cycle simulation program for system air-conditioners consists of several subroutines for simulating indoor unit, outdoor unit, compressor, and expansion devices, and for estimating the thermodynamic and transport properties of the refrigerants and moist air. It was programmed with Digital Visual Fortran for the main simulation code and Visual Basic for the graphic user interface.

프리스트레스트 콘크리트 橋梁의 解析 및 設計自動化

金亮均,李準熙,崔正鎬,申鉉穆 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2

Computer programs called "PCBRG" and "PCPST' were developed to analyze and design the prestressed concrete bridge. PCBRG is a structural analysis program which can determine the member forces, displacements and adaptable area of tendon by iteration method. PCPST is a post-processor for design. It enables design variables verified and the results of analysis (stress, member force and displacement, etc) are presented in the screen. Also the shear force and bending strength by the deformation compatibility method were checked.

麥作에 있어서 Isoproturon의 殺草特性과 藥害 및 收量에 미치는 影響

梁瑢承(Ryang, Y. S),金鍾奭(J. S. Kim),韓性洙(S. S. Han),梁桓承(H. S. Ryang) 韓國雜草學會 1982 Weed&Turfgrass Science Vol.2 No.2

전이지대 방언의 변이 양상 고찰 -서남방언과 동남방언의 접경지를 중심으로-

위평량 ( Wi Pyeong-ryang ) 한국방언학회 2021 방언학 Vol.- No.33

본고에서는 서남방언과 동남방언의 접경지에 분포하는 변이형들을 접촉과 변이의 정도를 따라서 3가지 형태로 분류하여 정리하여 보았다. 1) 단어, 음절 단위의 차용과 변이(병렬, 혼효), 2) 음소 단위의 차용과 변이(자음, 모음 차용), 3) 제3유형으로의 변이 가능성을 살펴볼 것이다. 이 중 제3유형의 변이형들은 방언의 접촉과정에서 나타날 수 있는 ‘아래아(ㆍ) 변화의 방향’, ‘자음의 충돌과 변화’ 등에 대한 새로운 시각을 제시해 줄 수 있을 것이다. 그리고 만약 이러한 결과가 접촉의 과정에서 나타나는 변이의 모습으로 타당성을 가질 수 있다면 다른 방언 접경지의 수많은 변이형들을 재조명해 볼 수 있을 것이며, 다양한 환경에서 나타나는 국어의 음운변화 과정도 예측해 볼 수 있지 않을까 생각한다. I tried to find(prove) that any variation, which takes place when one dialect comes in contact with the other, does not take forms randomly but to any extent with direction and rules in Wi Pyeong-ryang(2005). And so I will confirm again that any variation keeps the head of the base of the former word and permits the tail of the other word depending upon the extent(degree) of each other’s influence through the distribution of ‘galkwi’(‘fork’) word forms. However, the causes of any variation are so varied and difficult to predict that any variation is varied and complex. It is difficult to conclude whether this aspect is the result of the contact of two dialects or the area’s particular aspects of the language of the area in question. This work will investigate(study) a lot of variations of the border lines of Jeallado and Gyongsangdo. These areas show the difference of west-southern dialect and east-southern dialect. The types of variation of these areas are 1) borrowing and variation of a word or a syllable 2) borrowing and variation of a phoneme (consonant, vowel borrowing) 3) the possibility of variation to the third type. I don’t jump to a conclusion that the new types, which are assumed to be the variations of the third type, resulted from the contact of the dialects. I will analyze these types based on the viewpoint of contact dialects. I will consider the possibility that we will predict the process of Korean phonologic changes if these changes are from the process of contact. Though this viewpoint is farfetched, I give(show) you(the readers) the chance of scrutinizing the reality of the variation of the contact areas.

Structures and defects of atomic wires on Si(553)-Au: An STM and theoretical study

Ryang, Kyung-Deuk,Kang, Pil Gyu,Yeom, Han Woong,Jeong, Sukmin American Physical Society 2007 Physical review. B, Condensed matter and materials Vol.76 No.20

Expression on Echinostoma hortense Infection Manifestation on the Cytokine of the Splenocytes of BALB/c and C3H/HeN Mice

Ryang Yong-Suk,Cho Yoon-Kyung,IM Jee-Aee,Lee Kyu-Je,Kim Insik,Sung Ho-Joong 대한의생명과학회 2004 Biomedical Science Letters Vol.10 No.3

This experiment was performed to examine the in vitro and in vivo affects of the two different haplotype strains of mice, BALB/c and C3H/HeN infected with Echinostoma hortense, and the manifestation of the profiles of cytokine in the splenocytes. In the in vitro experiment, the two mice's splenocytes were divided and stimulated with antigen of crude extracts and the antigen of excretory and secretory products of an adult warm and the manifestation of cytokine mRNA was verified with RT-PCR. As a result, the two different strains of mice both strongly manifested the Th2 cytokine rather than the Thl cytokine and in the case of the Th2 cytokine, the BALB/c mice manifested more strongly than the C3H/HeN mice. In the experiment using the ELISA method, the protem cytokine manifestation had the same result as the mRNA experiment. In the in vivo experiment, the mice was infected via oral route with the metacercaria of the Echinostoma hortense and the manifestation of cytokine was verified by RT-PCR and ELISA and the results were the same as the in vitro experiment. Therefore, in the two strains of BALB/c and C3H/HeN, the C3H/HeN showed a higher susceptivity to the Echinostoma hortense.

Establishing the Factorial Validity of the Mathematics Teaching Efficacy Scale: Confirmatory Factor Analysis

( Ryang Dohyoung ) 한국수학교육학회 2014 수학교육 학술지 Vol.2014 No.1

This study develops the Mathematics Teaching Efficacy Scale (MTES) measuring efficacy beliefs of Korean preservice teachers seeking the secondary mathematics teaching certificate. This study focuses on establishing the factorial validity of the MTES based on Bandura`s two-dimension theory. The 2-factor structure of the MTES was explored on the first data set, andthen the structure was confirmed on the second subset.TheMTES consists of 18 items: 12items of the personal efficacy and the sixitems of theoutcome expectancy.

Secondary hyperparathyroidism due to multiple parathyroid carcinomas in a patient with chronic hemodialysis: a case report

Ryang So Ree,이욱,김미진,송상헌,이병주,김보현 고신대학교(의대) 고신대학교 의과대학 학술지 2022 고신대학교 의과대학 학술지 Vol.37 No.3

Parathyroid carcinoma (PC) in cases of secondary or tertiary hyperparathyroidism is relatively uncommon, and only a few case reports have described this entity. Although some papers have reported patients with one or two parathyroid malignancies, multiple PC–especially three or more–have been even more rarely reported. Herein, we report a case of secondary hyperparathyroidism due to multiple PCs in a chronic hemodialysis patient. A 54-year-old man with end-stage kidney disease was referred for hyperparathyroidism. He had been diagnosed with chronic kidney disease in 2001 and had begun hemodialysis in 2009. In laboratory tests, intact parathyroid hormone (iPTH) was markedly elevated to 1,144.1 pg/mL (normal range: 15.0–68.3 pg/mL) and serum calcium was mildly elevated to 10.56 mg/dL (normal range: 8.5–10.3 mg/dL). Ultrasonography showed hypoechoic nodules in the posterior part of both thyroid glands. All three nodules showed increased uptake on a 99mTc sestamibi scan. The patient underwent total parathyroidectomy with autotransplantation to the right forearm. Histopathology findings showed three PCs with capsular invasion and one parathyroid hyperplasia. In the immediate postoperative period, the iPTH level dropped from 1,446.8 to 82.4 pg/dL and, after 1 month, to 4.0 pg/dL. This patient needed oral calcium carbonate and active vitamin D to maintain appropriate serum calcium levels. Although multiple PCs are rare, they can cause secondary hyperparathyroidism. Therefore, clinicians should suspect multiple PCs when patients’ serum iPTH levels are exceptionally high. Additionally, since PCs could occur in multiple glands, autotransplantation of the parathyroid gland after parathyroidectomy should be done carefully.

A METHOD USING PARAMETRIC APPROACH WITH QUASINEWTON METHOD FOR CONSTRAINED OPTIMIZATION

Ryang, Yong-Joon,Kim, Won-Serk Korean Mathematical Society 1989 대한수학회보 Vol.26 No.2

This paper proposes a deformation method for solving practical nonlinear programming problems. Utilizing the nonlinear parametric programming technique with Quasi-Newton method [6,7], the method solves the problem by imbedding it into a suitable one-parameter family of problems. The approach discussed in this paper was originally developed with the aim of solving a system of structural optimization problems with frequently appears in various kind of engineering design. It is assumed that we have to solve more than one structural problem of the same type. It an optimal solution of one of these problems is available, then the optimal solutions of thel other problems can be easily obtained by using this known problem and its optimal solution as the initial problem of our parametric method. The method of nonlinear programming does not generally converge to the optimal solution from an arbitrary starting point if the initial estimate is not sufficiently close to the solution. On the other hand, the deformation method described in this paper is advantageous in that it is likely to obtain the optimal solution every if the initial point is not necessarily in a small neighborhood of the solution. the Jacobian matrix of the iteration formula has the special structural features [2, 3]. Sectioon 2 describes nonlinear parametric programming problem imbeded into a one-parameter family of problems. In Section 3 the iteration formulas for one-parameter are developed. Section 4 discusses parametric approach for Quasi-Newton method and gives algorithm for finding the optimal solution.

Photoaddition Reaction of Biacetyl

RYANG, Hong-Son 朝鮮奬學會 1973 學術論文集 Vol.3 No.-

The photochemical reaction of biacetyl with various olefins has been investigated. Irradiations of biacetyl with indene, furan, and ethyl vinyl ether give oxetanes with higher orientational selectivity than that of monoketones. In the case of methyl-substituted olefins, it is found that novel prnducts, 2-acetoethyl allyl ethers, accompany the oxetanes and are formed in good yield. The ratios of these products vary with the olefins used. The presence of biradical intermediates formed by addition of excited biacetyl to olefins is established by deuterium-labeling experiments. The quenching of biacetyl phosphorescence by an olefin indicates that the n-π* triplet state of biacetyl is involved in these reactions. The absence of adduct in the case of electron-deficient olefins indicates that the excited biacetyl is electrophilic in its reaction with olefins. The mechanism of these reactions is best described as an electrophilic attack of the n-π* triplet state of biacetyl to the olefins to give a biradical intermediate which undergoes competitive cyclization and disproportionation. The difference in the reactivity of biacetyl toward photoaddition relative to monoketones and o-quinoues is discussed.