Study on the Effect of Air Circulator on Temperature Distribution in an Oyster Mushroom Farm

( Won Geun Jeong ),( Hack Kyu Lim ),( Tae Han Kim ) 한국농업기계학회 2013 바이오시스템공학 Vol.38 No.2

Purpose: Recently, domestic and abroad consumption of mushroom has been increasing. Especially, oyster mushroom has been the most consumed product, sharing one third of the mushroom market. The air temperature differences between relative positions of the mushroom farms were needs to be minimal. However, in reality, the air temperature differences ranged from 2 to 5℃. Because of this, the mushrooms are non-uniform growth as well as decrease in both quality and quantity. Although air circulators have been employed by oyster mushroom farms to minimize air temperature differences, no experiments have been performed to illustrate the effect of the air circulators. Methods: This experiment is designed to analyze the effect of the air circulation by constructing a prototype air circulator and measuring the air temperature when the circulator was position at different heights (50cm, 150cm, 200cm) from the floor in the center. Result: The horizontal plane air temperature of the first growing bed when the air circulator was installed 50cm above the floor in the center, once not using the air circulators and the other time using the air circulators, yielded the air temperature differences of 8.6℃ and 1.8℃ and deviations of 2.82and 0.60, respectively. The third growing bed`s air temperature differences were 10.0℃, 1.6℃ and deviations 3.28, 0.64, each respectively. These outcomes proved that the use of air circulators minimized the air temperature difference and deviation. The use of air circulators helped minimize the air temperature differences and the derivations in oyster mushroom farm. Conclusion: The use of air circulators helped balance the air temperature distribution in oyster mushroom farm.

Analysis of Air Circulation in Oyster Mushroom Farm

Jeong, Won-Geun,Lim, Hack-Kyu,Kim, Tae-Han Korean Society for Agricultural Machinery 2012 바이오시스템공학 Vol.37 No.2

Oyster mushroom farm which could not meet optimum temperature range yields non-uniform sized, low quality products. Thus, this study, utilizing STAR CCM+, one of the computational fluid dynamics (CFD) programs, analyzed the impact of air circulation and temperature distribution. Methods: After we visited numerous mushroom farms, we measured the temperature at the discharge ports of heaters, fan capacity, and the locations of the air circulators in the farms. According to the data, most mushroom growers installed the heaters near the entrance and discharge ports of the heaters at the third growing bed on the same height as the heaters in the entrance. The temperature at the discharge port of heater was $1,26^{\circ}C$, and the fan capacity was 4,500 $m^3$/hr. The air circulator was placed in the center of the mushroom farm 50cm above the ground, and its capacity of inlet port was 1,100 $m^3$/hr and discharge port 1,600 $m^3$/hr. The mushroom farm was insulated. Results: According to the analysis of the temperature distribution in the vertical plane of the entrance side, no air circulation causes the high temperature zone of 296~299K at the discharge port of the heater to take up 34% of area while the operation of air circulators causes it to occupy only 9%. This means that not using air circulators leads to a concentration of high temperature at the discharge port near the entrance. In addition, with the results of the analysis of the temperature distribution in the vertical planes of the center, no air circulation causes the temperature zone of 295~298K at the discharge port of the heater to take up 48% of area while the operation of air circulators causes it to occupy 80%. This shows that the high outlet port temperature disseminated to the center. Conclusions: After ninety minute operation of both heater and air circulator, the interior temperature became stabilized in the mushroom farm. Air circulation made the high temperature at the discharge port disseminate to the center and exit in the farm and equalize the temperature distribution.

A Study on Recovery of Ag, Al and Si from Waste PV Modules

Won Geun Lee,Tae Young Kim,Pan Pan Sun,Hui Jeong Park,Sung Yong Cho 한국도시환경학회 2019 한국도시환경학회지 Vol.19 No.1

Effect of Mn doping on particulate size and magnetic properties of LaFeO₃ nanofiber synthesized by electrospinning

Jeong, Jung-Hoon,Song, Chan-Geun,Kim, Kee-Hoon,Sigmund, Wolfgang,Yoon, Jong-Won Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.749 No.-

<P><B>Abstract</B></P> <P>Ultrafine one-dimensional LaFe<SUB>1-x</SUB>Mn<SUB>x</SUB>O<SUB>3</SUB> (0.00 ≤ x ≤ 0.15) nanofibers were prepared by electrospinning. The X-ray diffraction pattern of Mn-doped LaFeO<SUB>3</SUB> nanofibers showed orthorhombic perovskite crystalline structure of LaFeO<SUB>3</SUB>. Transmission electron microscopy (TEM) images revealed that the nanofibers were composed of fine particulates with diameter of about 50 ± 5 nm in pure LaFeO<SUB>3</SUB> and 35 ± 5 nm in 15 mol% Mn-doped nanofibers. The chemical state of Mn<SUP>3+</SUP> and Mn<SUP>4+</SUP> in Mn-doped LaFeO<SUB>3</SUB> nanofibers were confirmed from curve fitting after X-ray photoelectron spectroscopy (XPS) measurement. The optical energy bandgap decreased with increasing Mn-doping, which can be ascribed to Mn dopant levels near the conduction band. A clear hysteresis loop can be observed for Mn-doped LaFeO<SUB>3</SUB> nanofibers. With increasing Mn concentration, remnant magnetization linearly increased from 0.098 to 0.289 emu/g at 10 K, which is due to uncompensated spin moment at the surface and the differences of spin magnetic moments between Fe and Mn ions. The coercivity is decreased from 632 to 190 Oe, following an increasing trend with increase of particles size up to a critical particle size. The present work shows that Mn doping in LaFeO<SUB>3</SUB> nanofibers is a very effective method for having enhancement of magnetic property in antiferromagnetic LaFeO<SUB>3</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ultrafine Mn-doped LaFeO<SUB>3</SUB> nanofibers have been synthesized using electrospinning. </LI> <LI> The particulate size showed decrease with increasing Mn concentration from 51 to 23 nm. </LI> <LI> With increasing Mn concentration, remnant magnetization linearly increased. </LI> <LI> The coercivity is decreased from 5 mol% Mn concentration. </LI> </UL> </P>

Chronic gastrointestinal symptoms and quality of life in the Korean population.

Jeong, Jeong-Jo,Choi, Myung-Gyu,Cho, Young-Seok,Lee, Seung-Geun,Oh, Jung-Hwan,Park, Jae-Myung,Cho, Yu-Kyung,Lee, In-Seok,Kim, Sang-Woo,Han, Sok-Won,Choi, Kyu-Yong,Chung, In-Sik WJG Press 2008 WORLD JOURNAL OF GASTROENTEROLOGY Vol.14 No.41

<P>To evaluate the prevalence of chronic gastrointestinal symptoms and their impact on health-related quality of life (HRQOL) in the Korean population.</P>

Immunohistochemical Study on the Hair Growth Promoting Effect of Yonnyuniksoogobon-dan

Jeong, Chun-Geun,Park, Min-Hee,Seong, Ju-Won,Lee, Hyun-Sam,Park, Seong-Kyu,Kim, Sun-Yeou,Kim, Yoon-Bum,Jung, Hyuk-Sang,Sohn, Nak-Won,Sohn, Young-Joo The Society of Korean Medicine 2008 대한한의학회지 Vol.29 No.5

Objectives : This study evaluates the hair growth promoting effect of Yonnyuniksoogobon-dan on shaved C57BL6 mice. Methods : Yonnyuniksoogobon-dan was administered orally (Group I) and both orally and by skin application (Group II) once a day for 12 days. The experimental groups were compared to Control, which was orally administered physiological saline solution. Hair regrowth was photographically and histologically determined during the experimental period. The levels of hair growth cycle related factors (EGF, TGF-${\beta}$1) and vascular factors (VEGF, iNOS) were also determined by immunohistochemistry. On gross observation of hair growth, both Group I and Group II shaved C57BL6 mice showed accelerated hair regrowth. Results : The hair regrowth index of Group I increased significantly from 7 days (P<0.05) to 12 days (P<0.01) after shaving and that of Group II was significantly higher at 12 days (P<0.05). On histological observation, both Group I and Group II demonstrated histological improvement and increases in the number and diameter of the hair follicles. EGF expression on the root sheath of hair follicles was up-regulated in both Group I and II. TGF-${\beta}$1 expression on the root sheath of hair follicles was unchanged in both Group I and II. VEGF expression in the tissues surrounding hair follicles was up-regulated in both groups. iNOS expression in the tissues surrounding hair follicles was down-regulated in both groups. Conclusions : These results suggest that Yonnyuniksoogobon-dan promotes hair growth and this effect is related to up-regulation of EGF and VEFG expression and down-regulation of TGF-${\beta}$1 and iNOS expression on hair roots.

Distribution of Staphylococcus pseudinlerinedius in clinical cases of dogs

( Jeong Hee Kim ),( Jin Won Yang ),( Won Geun Son ) 한국예방수의학회(구 한국수의공중보건학회) 2012 예방수의학회지 Vol.36 No.2

Staphylococcus intermedius has been most common agent associated with dog diseases, such as pyoderma and otitis externa. Recently, S. schleferi subsp. coagulans has been also detected in suppurative diseases of dog and the organism formerly known as S. intermedius is called as S intermedius group (SIG), consisting of S. intermedius, Staphylococcus pseudinrermedius and Staphylococcus delphini. From a clinical point of view, S. pseudintermedius is emerged as the most significant species of the SIG. A total of 72 SIG tested were positive for the presence of Slnuc gene specific to S. iniermedius and 67 (93.1%) isolates were S. pseudintermethus and only 5 (6.9%) S. intermedius, differentiating on the basis of arginine dyhydrolase production. None of the strains was identified as S. schleiferi subsp. coagulans. As results, S. pseudinrermedius was found to be dominant in SIG from dogs in Jeju.

Real-time Image Scanning System for Detecting Tunnel Cracks Using Linescan Cameras

Jeong, Dong-Hyun,Kim, Young-Rin,Cho, I-Sac,Kim, Eun-Ju,Lee, Kang-Moon,Jin, Kwang-Won,Song, Chang-Geun Korea Multimedia Society 2007 멀티미디어학회논문지 Vol.10 No.6

In this paper, real-time image scanning system using linescan cameras is designed. The system is specially designed to diagnose and analyse the conditions of tunnels such as crack widths through the captured images. The system consists of two major parts, the image acquisition system and the image merging system. To save scanned image data into storage media in real-time, the image acquisition system has been designed with two different control and management modules. The control modules are in charge of controlling the hardware device and the management modules handle system resources so that the scanned images are safely saved to the magnetic storage devices. The system can be mounted to various kinds of vehicles. After taking images, the image merging system generates extended images by combining saved images. Several tests are conducted in laboratory as well as in the field. In the laboratory simulation, both systems are tested several times and upgraded. In the field-testing, the image acquisition system is mounted to a specially designed vehicle and images of the interior surface of the tunnel are captured. The system is successfully tested in a real tunnel with a vehicle at the speed of 20 km/h. The captured images of the tunnel condition including cracks are vivid enough for an expert to diagnose the state of the tunnel using images instead of seeing through his/her eyes.

Curcumin suppresses the induction of indoleamine 2,3-dioxygenase by blocking the Janus-activated kinase-protein kinase Cdelta-STAT1 signaling pathway in interferon-gamma-stimulated murine dendritic cells.

Jeong, Young-Il,Kim, Sang Woo,Jung, In Duk,Lee, Jun Sik,Chang, Jeong Hyun,Lee, Chang-Min,Chun, Sung Hak,Yoon, Man-Soo,Kim, Geun Tae,Ryu, Seok Woo,Kim, Jong-Suk,Shin, Yong Kyoo,Lee, Won Suk,Shin, Hwa K American Society for Biochemistry and Molecular Bi 2009 The Journal of biological chemistry Vol.284 No.6

<P>Indoleamine 2,3-dioxygenase (IDO) catalyzes the initial and rate-limiting step in the degradation of tryptophan and is strongly induced in interferon-gamma (IFNgamma)-stimulated dendritic cells (DCs). IDO has recently been established as a key enzyme in T-cell suppression-mediated immune tolerance to tumors. STAT1 phosphorylation appears to play an important role in the control of IDO expression by IFNgamma, but the precise regulatory mechanism remains obscure. Here we present a novel mechanism of IFNgamma-induced IDO expression in bone marrow-derived dendritic cells. In addition, we demonstrate that curcumin, an active component of turmeric, significantly inhibited the induction of IDO expression and activity by IFNgamma. We found that curcumin suppressed STAT1 activation by directly inhibiting Janus-activated kinase 1/2 and protein kinase Cdelta phosphorylation in bone marrow-derived DCs, suppressing the subsequent translocation and binding of STAT1 to the GAS element of the IRF-1 promoter. Coincident with these inhibitory effects on IFNgamma-induced IDO expression, curcumin reversed IDO-mediated suppression of T-cell responses. Our results, thus, suggest that down-regulation of IDO in DCs is an important immunomodulatory property of curcumin that may be exploited therapeutically in the control of cancers.</P>

Research Articles : Analysis of Air Circulation in Oyster Mushroom Farm

( Won Geun Jeong ),( Hack Kyu Lim ),( Tae Han Kim ) 한국농업기계학회 2012 바이오시스템공학 Vol.37 No.2

Oyster mushroom farm which could not meet optimum temperature range yields non-uniform sized, low quality products. Thus, this study, utilizing STAR CCM+, one of the computational fluid dynamics (CFD) programs, analyzed the impact of air circulation and temperature distribution. Methods: After we visited numerous mushroom farms, we measured the temperature at the discharge ports of heaters, fan capacity, and the locations of the air circulators in the farms. According to the data, most mushroom growers installed the heaters near the entrance and discharge ports of the heaters at the third growing bed on the same height as the heaters in the entrance. The temperature at the discharge port of heater was 26°C, and the fan capacity was 4,500 m3/hr. The air circulator was placed in the center of the mushroom farm 50cm above the ground, and its capacity of inlet port was 1,100 m3/hr and discharge port 1,600 m3/hr. The mushroom farm was insulated. Results: According to the analysis of the temperature distribution in the vertical plane of the entrance side, no air circulation causes the high temperature zone of 296~299K at the discharge port of the heater to take up 34% of area while the operation of air circulators causes it to occupy only 9%. This means that not using air circulators leads to a concentration of high temperature at the discharge port near the entrance. In addition, with the results of the analysis of the temperature distribution in the vertical planes of the center, no air circulation causes the temperature zone of 295~298K at the discharge port of the heater to take up 48% of area while the operation of air circulators causes it to occupy 80%. This shows that the high outlet port temperature disseminated to the center. Conclusions: After ninety minute operation of both heater and air circulator, the interior temperature became stabilized in the mushroom farm. Air circulation made the high temperature at the discharge port disseminate to the center and exit in the farm and equalize the temperature distribution.