bluuebunny/crossref_metadata_2025 huggingface dataset:
The Relationship Between Employment Status and the Use of
Outpatient Medical Services
Authors: Kang Jeong-Hee , Lee Sang-Yi , Kim Chul-Woung , Lee Seung-Eun
Published: May 2022

Objectives: This study investigated the difference in the use of medical services depending on the employment status ofworkers, including regular workers, irregular workers, self-employed workers and the unemployed, and analyzed the relationshipbetween employment status and the use of outpatient medical services.Methods: Data of 11,903 economically active people aged 20-24 among the 21,235 people registered in the 2009 KoreaHealth Panel were collected and analyzed through logistic regression analysis in order to explore the relationship betweenemployment status and the use of outpatient medical services.Results: 6 out of 10 people in the sample group (economically active population aged 20-64) used outpatient medicalservices. Part-time workers were less likely to use outpatient medical services than regular workers (OR=0.81). However,economically inactive people, such as house workers (OR=1.40), the early retired (OR=1.72) and the sick or injured (OR=3.07),were more likely to use outpatient medical services than regular workers.Conclusions: While part-time workers among irregular workers were less likely to use outpatient medical services than regularworkers, the sick or injured, the early retired and house workers who belong to the economically inactive population were morelikely to use outpatient medical services than regular workers.
A Case of Persistent Trigeminal Artery Presenting with Vertebrobasilar Insufficiency
Authors: Lee Chang Sub
Published: May 2022

The author report a case of persistent trigeminal artery presenting with vertebrobasilar insufficiency. Persistent trigeminalartery frequently combined with hypoplasia of vertebrobasilar artery system, even though it is usually asymptomatic. A 51-yearoldwoman was presented with transient sense of left hemiparesis. The patient was underwent removal of Rathke's cleft cyst viatranssphenoidal route one and a half year prior to visit. Magnetic resonance angiography showed persistent trigeminal artery ofwhich connecting between left internal carotid artery and basilar artery.
Evaluation of Carotid Atherosclerosis Using Three-Phase CT
Authors: Kim In Young , Jeong Sun Young , Park Ji Kang
Published: May 2022

Purpose : Carotid atherosclerotic plaque (CAP) was evaluated by three-phase CT (TPCT; CTpre, CTartery, CTdelay). The purposes ofthis study are to: (1) to determine optimal phase for the visualization of CAP components; (2) evaluate whether there is asignificant difference in the quantitative CT Hounsfield unit (CTHUs) of the CAP components between the arterial and delayphase.Materials and Methods : Two reviewers evaluated the detection rate and image quality for CAP components on CTartery andCTdelay source images in 36 patients. Quantitative analysis of the CTHUs for the soft plaque and outer wall was performed in 47arteries. The CTHUs were measured for the soft plaque and the outer wall using the manual ROI method for each carotidplaque. The difference of image quality on CTartery and CTdelay, the difference of the CTHUs according to CT phase, the differencein CTHUs according to the arterial symptomatology or stenosis degree were statistically evaluated.Results : CTdelay was the optimal phase for the delineation of soft plaque and outer wall enhancement. The CAP componentsshowed progressive delayed enhancement. There were statistically significant increase in the enhancement of the outer wallthrough TPCT (p <0.001). CTHUs of soft plaque and outer wall on CTdelay and CTartery did not show significant correlations withsymptomatology. The CTHUs of soft plaque on CTartery (p =0.02) and CTHUs of the outer wall on CTdelay (p =0.01) weresignificantly higher in the group of symptomatic arteries or severely stenotic arteries together that that in the group ofasymptomatic arteries with less than 70% stenosis.Conclusion : CTdelay was the optimal phase for plaque detection and the characterization of plaque components.
Incidence and Prediction of Hypoparathyroidism after Total Thyroidectomy
Authors: Kim Min Jung , Choi Jae hyuck
Published: May 2022

INTRODUCTION : Hypocalcemia caused by hypoparathyroidism is the most common postoperative complication after total thyroidectomy. The aim of this study is to determine the incidence of hypoparathyroidism and the time course of recovery from hypoparathyroidism.MATERIALS and METHODS : 105 patients who underwent total thyroidectomy with central compartment dissection from Jan 2011 to June 2012 in Jeju national university hospital were reviewed retrospectively. Serum PTH and calcium levels tested before and after surgery were analyzed.RESULTS : Transient hypoparathyroidism was found in fifty-one patients (48.6%) at seond postoperative days. But most of them recovered with the course of time (15.2% in 8 weeks, 6.7% in 5 months, 2.9% in 9 months after surgery), and persistent hypoparathyroidism was remained in only one patient at one years after surgery. Preoperative PTH level showed a significant positive correlation with the PTH levels at POD#2 (Pearson r=0.277； p<0.004), but it was not a good predictor for the postoperative hypoparathyroidism in ROC curve analysis (AUC=0.507).CONCLUSIONS : About half of patients undergoing total thyroidectomy developed hypoparathyroidism, but most of them recovered within several months. The preoperative PTH was correlated with postoperative hypoparathyroidism significantly, but it was not appropriate to predict postoperative hypoparathyroidism.
Follow Up of the Results of Dismembered Pyeloplaty in Children
Authors: Kim Young-Joo , Huh Jung-Sik , Kim Sung-Dea , Park Kyung Kgi
Published: May 2022

We evaluated the outcome of dismembered pyeloplasty due to ureteropelvic junction (UPJ) obstruction based ondifferentiations between pre-operative findings and post-operative findings in children. Medical records of 72 children(boy:girl=58:14) with a urographically proven, clinically significant, UPJ obstruction, who underwent 72 dismemberedpyeloplasties were retrospectively reviewed. All patients were followed up for 47.6±18.3 months. An intravenous pyelography,99mTc-DTPA and 99mTc-DMSA renal scan were performed for the majority of paients, pre-operatively and 3 months afteroperation. The major etiology of the patients was periureteral fibrosis (40.3%). In postoperative results, 'Good' result was 46(63.9%), 'Fair' 16 (22.2%). In the IVP, pre-/postoperative grade of hydronephrosis was no significant differentiation. Inultrasonography, pre-/postoperative grade of hydronephrosis was too. In 99mTc-DMSA renal scan, pre-/postoperative themean total function was significant differentiation. The success rate of dismembered pyeloplasy was high (86.1%) There was notclear relationship between the success of operation and the parameters. More study is needed with numerous patients and longterm follow up.
Primary Cutaneous Actinomycosis of the Chest Region: two Case Reports
Authors: Lee Ji-Na , Cheon Minseok , Kim Jae-Wang
Published: May 2022

Actinomycosis is a rare, chronic progressive, suppurative infection caused by an endogenous, anaerobic, gram-positivebacterium classified in the genus Actinomyces. This infection usually begins as a localized inflammatory mass with penetration ofthe overlying skin and formation of draining sinuses. Diagnosis depends upon the clinical presentation of non-tendersubcutaneous nodules, abscesses, sinus and discharge followed by histopathological examination, which shows a diffuse mixeddermal infiltrate, microabscess, granulation tissue, fibrosis and characteristic sulfur granules. Primary cutaneous actinomycosis isan uncommon subtype with non-specific clinical symptoms, and thus requires a high index of clinical suspicion. We presenthere two cases of primary cutaneous actinomycosis of the chest region, which had been diagnosed through the skin biopsy.
Cerebellar involvement in CADASIL
Authors: Lee Jung Seok , Kang Chul-hoo , Oh Jung-Hwan , Song Sook Keun , Choi Jay Chol , Kang Sa-Yoon , Kang Ji-Hoon , Jeon Bong-hee , Park Joon Hyuk
Published: May 2022

Background and Purpose: Cerebral autosomal-dominant arteriopathy with subcortical infarcts and leukoencephalopathy(CADASIL) is an inherited small vessel disease caused by mutations in the Notch3 gene. The cerebellum has long been knownto be rarely affected by small vessel disease in CADASIL. However, recent studies have shown that cerebral microbleeds arefrequently detected and intracranial hemorrhage often occurs in the cerebellum. Our purpose was to examine the influence ofepidemiological and vascular risk factors on cerebellar involvement in patients with CADASIL.Methods: The study population comprised 84 patients who underwent brain MRI, including T1-weighted image, susceptibilityweighted image (SWI), and fluid attenuated inversion recovery (FLAIR) image. Patients were divided into two groups dependingon the presence (CADASIL-C: n=19) or absence (CADASIL-NC: n=65) of cerebellar lesions. The impact of demographical andvascular risk factors on cerebellar lesions was assessed by logistic regression analysis.Results: Age was an independent risk factor for cerebellar microbleeds in patients with CADASIL. However, there was nosignificant association between hypertension and cerebellar microbleeds.Conclusions: Our findings suggest that CADASIL affect cerebellum and cerebellar microbleeds tend to occur in elderly patientswith CADASIL.
Epidural steroid injection for spinal pain
Authors: Choi Yun Suk , Kwak Ho-Young , Huh Jisoon
Published: May 2022

Spinal pain is one of the most common complaints of patients and making an economic burden on society. The worldwidelifetime prevalence of lower back pain was reported as 84%. Most general physicians, as well as spine surgeons, commonlyencountered to the diagnostic and management strategy for spinal pain. Currently, nonsurgical invasive treatment includinginjection therapy before surgery had been routine management option. The epidural injections with or without corticosteroid wasproven to be effective for spinal pain, especially with radiculopathy, in short term period. The long term effect and combineduse of corticosteroid are under debate. Further rationalized studies for these debates should be conducted. To help the doctorsin choosing rationalized nonsurgical treatment methods for spinal pain, this study present the evidence based effectiveness ofepidural injections and comprehensive reviews of current trends for corticosteroids in use for spinal pain treatment.
Statistical Analysis of Natural Deaths Confirmed by Medicolegal Autopsy
Authors: Lee You Ju , Kyung Kim Soo , Kang Hyun Wook
Published: May 2022

Some cases of natural deaths often come under the scrutiny of medicolegal investigation because of their sudden andunexpected nature of onset. To know current status of natural sudden deaths occurred in Jeju, authors analyzed naturaldeaths autopsied in Jeju National University during 2011-2013. All subjects were reviewed with respect to age, sex andcause of death.The results were as follows:1. The total number of unusual deaths autopsied was 256, of thsee 105 cases(29.5%) were natural death.2. Male/female ratio was 2.9:1.3. The male group of age in forties and fifties occupied 42.9%o f total natural deaths.4. Ischemic heart disease was the leading cause of natural detahs(26.7%).5. Deaths due to vascular and digestive origin were 19(18.1%) a nd 27(25.7%), respectively.6. Natural deaths of ill-defined cause were 10 cases(9.5%)
Real-Time Quantitative Polymerase Chain Reaction for Apolipoprotein E genotyping
Authors: Park Young Hwan , Kim Young Ree , Kim Sun Hyung , Kang Sung Ha
Published: May 2022

Background : Apolipoprotein E (ApoE) is an important substance responsible for the lipoprotein metabolism and thetransportation of lipid and known to play an important role in the body's physiological and pathological processes. Recently,ApoE genotyping test has been applied to the field of diagnostic methods for predicting high risk of Alzheimer's disease,cardiovascular diseases, as well as new diseases such as immune regulation disorders. Therefore, a faster and more accurateApoE genotyping test is required for the prevention of related disease and the general public health.Methods : We evaluated 220 serum specimens using two kinds of assays: one-stop Real-Q ApoE genotyping (BioSewoom,Seoul, Korea) and Seeplex ApoE ACE genotyping (Seegene, Seoul, Korea). The results were finally confirmed using sequencingas the reference. Statistical analysis was performed for the concordance rates between each assay and sequencing and thesensitivity and specificity were calculated with their 95% confidence intervals.Results : Sequencing results of 220 DNA samples showed 1 case of E2/E2, 139 of E3/E3, 9 of E4/E4, 17 of E2/E3, 4 ofE2/E4, 50 of E3/E4. The concordance rate between One-step Real-Q ApoE genotyping and sequencing was 100% (220/220),and that between Seeplex ApoE ACE genotyping and sequencing was 99.5% (219/220). Both sensitivity and specificity of OnestepReal-Q ApoE genotyping for every genotypes was 100%. The sensitivities and specificities of Seeplex ApoE ACEgenotyping were almost 100%, with two exception: 99.3% sensitivity in E3/E3 and 99.5% specificity in E2/E2.Conclusions : The performances of One-step Real-Q ApoE genotyping and Seeplex ApoE ACE genotyping were comparableoverall. However, the former showed better sensitivity and specificity comparable with those of sequencing. Hence, One-stepApoE genotyping could be a faster and more accurate option for ApoE genotyping.
Evaluation of disability judgement criteria in urologic field
Authors: Lee Mi Rae , Park Kyung Kgi , Kim Young Joo , Huh Jung-Sik , Kim Sung Dae
Published: May 2022

The purposes of this study were to obtain information about the registered physically disabled and to find out problemsin current disability grading for the registration of disabled people like as voiding disorder or sexual disorder in urologicfield. Although the issues concerning the disability evaluating system in Korea are controversial to say the least.Evaluation system are so complicated that they continually cause confusion to medical status precisely, reasonably andobjectively to supply sufficient compensation for patients. All urologist including authors should know very well thedisablity evaluation system in urologic field considering social environments evaluation standards. examiner’s capabilityand educations.
The effects of experience as a rater upon the objective clinical skill examination
Authors: Lee Jae-Sung , Kang Youngjoon,
Published: May 2022

Introduction : Our knowledge and competence would be improved after teaching or evaluating others.We presumed that the experience of evaluating others affect the knowledge and competence for a task. This study examinedthe effects of experience as a evaluator.Methods : 34 students were randomly allocated into the 2 groups. The one is the evaluator group and the other is theapplicant group. Before simulation, all of students were compared with 3 written tests and clinical performance examination. Allof the students were put into the task to make check list, so they knew the contents of 33 objective skill clinicalexaminations(OSCE). The applicant group had undergone 33 OSCEs. The evaluator group had evaluated the simulation groupwith check list. The evaluator group had executed same 33 OSCE on the next day. We compared the score of OSCEs between2 groups. We surveyed how much they thought their knowledge and performance were increased.Results : The applicant group were evaluated 33 object skills clinical examinations by the evaluator group. The evaluatorgroup acquired higher score than the applicant group in 21 clinical skill tests. The 12 clinical skill test score of the evaluatorgroup were higher than the applicant group significantly. But the applicant group were superior than the evaluator group in theonly 5 clinical skills significantly. The evaluator group was higher in 9 clinical skill test and lower in 7 clinical skills than theapplicant group. But it were not statistically significant(Figure. 1). 28 students answered the questionnaire about the increase oftheir comprehension, skill performance The average of their interest as an evaluator was 4.21(0.69). The average ofcomprehension extension after evaluation was 4.64(0.48). The average of skill improvement was 4.45(0.60)Conclusion : The experience as a evaluator can increase the understanding and the performance of clinical skills.
A case of normal fullterm spontaneous delivery after missing implanon®
Authors: Kim Ha Jung , Kang Hye Sim
Published: May 2022

Implanonⓡ is a single-rod subdermal contraceptive implant. It is usually located located and palpable around the insertion site,so it is easily inserted and removed. Most impalpable implanon is localized ultrasonography and magnetic resonance imaging.We report a patient whose implanon was undetected by ultrasonography and magnetic resonance imaging, but she pregnantand gave birth to a baby after insertion past five years.
A case of Positional asphyxia
- The importance of Livor Mortis -
Authors: Kim Sang Hun , Kim Seong Mi , Kang Hyun Wook
Published: May 2022

Positional(postural) asphyxia has been defined as asphyxia caused by unusual position of the body, leading to the inability toexpand the chest wall, which interferes with pulmonary ventilation, hence leading to respiratory failure. The diagnosis is usuallybased on circumstantial evidence in conjunction with excluding other significant underlying causes of death. In absence of thescene information, the diagnostic difficulties are evident because in the majority of such cases, the autopsy gives only negativeresults or reveals only slight signs of generic, nonspecific asphyxiation that are compatible with other, even natural, causes ofdeath. The characteristic distribution of postmortem hypostasis, and the stiffening of the body in that position were additionalconfirmatory evidence to that fact. The importance of this case report is attributed to the availability of hypostasis fixed in theundisturbed decedent that is extremely helpful in illustrating the cause and the manner of death.
Drug allergy
Authors: Lee Jaechun
Published: May 2022

Drug allergy is defined as the adverse drug reaction provoked by immunological mechanisms or roughly “type B” reaction,the mechanism of which cannot be explained by its own pharmacological mechanism. Drug allergy rarely happens in clinicalpractice, however, is usually dose-independent, unpredictable, and relatively severe in clinical manifestations. To find the safealternatives and to prevent further reactions, the causative agents should be investigated. Complete history taking of exposeddrugs and drug provocation tests are the mainstay in the diagnosis of the culprit drugs. The information of culprit drugs shouldbe opened and shared among healthcare providers for the further drug safety, called as pharmacovigilance.
Status of National Notifiable Infectious Diseases
in Jejudo, Korea: 2001-2016
Authors: Park Jung Eun , Kim Su-Young , Yang Don Haneng , Bae Jong-Myon
Published: May 2022

Objectives: The aim was to evaluate differences of the national notifiable infectious diseases (NNID) occurred in Jejudobecause it has unique geographical and climatologic characteristics compared with other areas in Korea.Methods: The source of data was on the Infectious Disease Statistics System operated by Centers for Disease Control &Prevention in Korea between 1 January 2001 and 31 December 2016. After calculating the proportion of sum of years showinga higher incidence in Jejudo than nationwide divided by sum of comparing years (PSYH) among 40 NNID, authors defined theinfectious diseases for control in Jejudo (IDCJ) with PSYH over 75%. And priorities among infectious diseases for control inJejudo (PIDCJ) were defined as infectious diseases showing an increasing trend in 2014-2016 among IDCJ.Results: IDCJ included five legally infectious diseases such as Enterohemorragic Escherichia coli infection (EHEC), chickenpox, pertussis, syphilis, and severe fever with thrombocytopenia syndrome. Among them, EHEC, pertussis, and syphilis weredefined as PIDCJ.Conclusions: The results support main evidences to plan strategies and distribute community resources for control andprevention of infectious diseases in Jejudo, Korea.
A Rare Case of Trauma-induced Kaposi's Sarcoma of Skin
Authors: Jo Jae Min , Han KyoungHee , Hyun Chang Lim , Kim Young-Sill , Maeng Young-Hee , Cheon Min Seok , Kim Jae-Wang , Rhee Ji Young , Kwon Jung Mi , Han Sang Hoon
Published: May 2022

Kaposi's sarcoma is malignant lesion usually caused by infection with human herpesvirus 8 in immunocompromised patients.Although many cases of this disease have been described in the literature, only a few cases have been related to Koebner'sphenomenon following trauma. In our case, 50-year-old male visited hospital with skin lesion of his right thumb pricked bymetal drill bit. A diagnosis of iatrogenic Kaposi's sarcoma was made. One year after surgical removal and radiation therapy thetumor was recurred with small nodules. Then medication of pentoxyphylline was started after excision biopsy. The lesions are instable disease with decreased size. The authors present an unusual case of trauma-induced Kaposi's sarcoma of skin in nonimmunocompromisedpatient.
Asymptomatic multiple piloleiomyoma occurring on the neck: report of
one case and a review on a variety of cutaneous leiomyoma
Authors: Han Ga-In , Kim Jae-Wang
Published: May 2022

Piloleiomyoma is a benign tumor originating from the arrector pili muscles of hair follicles. It is a clinicopathologic subtype of avariety of leiomyoma cutis. Piloleiomyomas are multiple, smaller, firm, reddened intradermal nodules presenting with clusters orlinear arrangement. These tumors are typically located on the trunk or extremities, characteristically accompanied withparoxysmal pain or tenderness. Herein, we present one case of painless multiple piloleiomyoma occurring on the neck region,along with a clinico-pathologic review of the literature.
The analysis of myeloid-derived suppressor cells in cancer patients with neutropenia to
evaluate the effect of granulocytes colony stimulation factor
Authors: Yang Sun Woo , Han Sanghoon , Kim Young Ree , Kim Sun Hyung
Published: May 2022

Myeloid-derived suppressor cells (MDSCs) are a heterogeneous cell population associated with immunosuppression andinflammation in cancer patients. Granulocytes colony stimulating factor (G-CSF) is frequently used in cancer patients withneutropenia. To evaluate the effect of G-CSF on patients being chemotherapy, we analyzed MDSCs in the peripheral blood.Peripheral blood was collected from 13 patients accompanied neutropenia during chemotherapy before and after G-CSFadministration. Flow cytometry was used to examine the percentage of MDSCs. The changes of MDSCs in the peripheral bloodaccording to G-CSF infusion were analyzed. The absolute neutrophil counts in patients before G-CSF administration were560±353 cells/uL (59-1,102 cells/uL). MDSCs were detected in the peripheral mononuclear cells with a cell percentage of2.74±4.02% (0.2-12.2%) and 5.48±8.56% (0.2-26.9%) before and after G-CSF infusion, respectively. Although there is nostatistically significance, G-CSF generally seems to move the MDSCs from the bone marrow to the peripheral blood to increaseMDSCs in the peripheral blood. It is necessary to study how the increased MDSCs affect the patient’s prognosis.
An Effect of Changing a Screening Test for Detecting Chlamydia
infection in a Community
Authors: Kim Eun Hee , Kim Jiro , Bae Jong-Myon
Published: May 2022

While a healthcare center changed a screening test for detecting Chlamydia infections on late March 2017, the centerreported sudden increased test positive (TP, %) in the first half of this year. The aim was to evaluate the association betweenthis soar in TP and the test change. To confirm the effect of the test change, the data was limited in mandatory screenees ofthe nationwide health program for managing sexually transmitted diseases with females aged over 20 years old in the first halfof this year. TPs and their confidence intervals (CI) before (January to March) and after (April to June) test change wereestimated. TP were 0% and 6.77% (95% CI: 4.29-10.07) before and after test change, respectively. The soar in TP ofChlamydia infections in the first half of this year could be explained by an effect of changing the screening test.
External Application of Horse Oil Alleviates Atopic
Dermatitis Symptoms in Mice
Authors: Yoon Sang-Hyun , Kang Na-Jin , Yoo Eun-Sook
Published: May 2022

Atopic dermatitis is characterized by skin barrier dysfunction, edema, and infiltration with various inflammatory cells. Horse oil,the purified form from horse fat, has been used for a long time by fork remedies on burn, wound, and various skin diseases. Inthis study, we investigated the improving effects of horse oil on atopic dermatitis induced by 0.3% of DNCB in mice. Horse oil B(oil phase, 100 mg/kg) significantly decreased serum IgE levels in experimental atopic dermatitis mice induced by DNCB. Also,horse oil A (cream phase, 100 mg/kg) and B alleviates atopic dermatitis symptoms (ear edema, inflammatory cell infiltration, andlymph node size). Overall, the effect of horse oil B was slightly better. These results suggest that horse oil can be a usefulremedy to improve atopic dermatitis.
Severe obstructive sleep apnea-hypopnea syndrome mimicking rapid eye
movement sleep behavior disorder
Authors: Oh Jung-Hwan
Published: May 2022

Rapid eye movement (REM) sleep behavior disorder (RBD) is characterized by loss of normal voluntary muscle atonia duringREM sleep, which can induce poor sleep quality or injury. Some kinds of sleep disorders are known to present with RBD-likesymptoms. I present the case of a 32-year-old man with severe obstructive sleep apnea-hypopnea syndrome mimicking RBDthat was established by polysomnography.
Characteristics of nerve conduction studies in carpal tunnel syndrome
Authors: Park Sung Joo , Kang Sa-Yoon
Published: May 2022

Nerve conduction studies are used for the electrodiagnosis of carpal tunnel syndrome (CTS), with a wide range of sensitivityand specificity reported for each tests in clinical studies. The aim of this study was to compare the diagnostic accuracy ofvarious nerve conduction tests and determine the properties of the most accurate test. Forty patients with clinically confirmedCTS and 40 healthy controls were included in the study. All patients and controls underwent various nerve conduction studyprotocols for CTS. The mean age was 53±11.6 years and the female to male ratio was 2:1. The mean duration of disease was1.25±0.61 years. The median nerve motor latency was 4.35±0.63ms while the sensory latency was 3.47±0.58ms. The mediannerve orthodromic sensory latency was found to be 2.51±0.32 ms. The conduction velocity across the palm and wrist was28.7 m/s. The sensitivity was the highest in the inching method (89.6%) and lowest for the conventional median motor andsensory latencies. Addition of a single test of median and ulnar sensory latency, the median and radial sensory latency or theinching method, in routine protocol will improve the sensitivity for the diagnosis of CTS in all patients.
Study of two species prey–predator model in imprecise environment with harvesting scenario
Authors:   Department of Mathematics, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Vijayalakshmi T. , Senthamarai R. ,   Department of Mathematics, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur
Published: May 2022

This study proposes and explores a prey–predator model that presents a functional response to group behavior of prey–predator harvesting. We study a non-linear model of prey–predator growths in two species. The proposed model is supported by theoretical and numerical results. Some numerical descriptions are provided to help our analytical and theoretical conclusions. For all possible parameter values occurring in a prey–predator system, we solved it by using both VIM (variational iteration method) and HPM (homotopy perturbation method). We also used MATLAB coding to compare our approximate analytical expressions with numerical simulations. We have found that there is no significant difference when comparing analytical and numerical results.
Teaching writing through Instagram to improve students’ writing skill at the first grade of SMA Negeri 15 Bandar Lampung
Authors:   Universitas Lampung, Nanda Rostania Dwi , Setiyadi Ag. Bambang ,   Universitas Lampung, Sholihah Lilis ,   Universitas Lampung
Published: May 2022

The objectives of the research are to identify the improvements to students’ writing skill and to find which aspect has the most significant improvement. This research used a quantitative method and Repeated Measures T-test used to analyze the data. The instrument is a writing test that consists of pre-test and post-test. The result shows that students’ overall mean was 68.07 In the pre-test, while the mean of the post-test was 77.64. It means that there was an increase in students’ scores by 9.57 points. Moreover, the most improved aspect was grammar. The mean of this aspect in the post-test (18.6) was higher than the mean in the pre-test (15.4) with the gain of 3.2. It can be said that Instagram can be applied in teaching writing to improve writing skill.
The correlation between students’ activity in playing English video games and student’s vocabulary mastery at SMAN 1 Bandar Lampung
Authors:   Universitas Lampung, Farhan Muhammad , Munifatullah Feni ,   Universitas Lampung, Nisa Khairun ,   Universitas Lampung
Published: May 2022

The primary goals of this reasearch are to find out the correlation between students’ activity in playing English video games and students’ vocabulary mastery. This research was conducted in SMAN 1 Bandar Lampung. The subject were 36 students of XI MIPA 2 as the subject of the research. Questionnaires and vocabulary test were used to collect the data. This research was using correlation through the application of quantitative methods by collecting the data from the test. The result of questionnaires showed that there were 20 students who had high level of playing English video games, 13 students had medium and 3 students had low. Meanwhile, the result of the vocabulary test showed that there were 2 students got outstanding level of vocabulary mastery. 18 students got good, 10 students got satisfactory, and 6 students got very weak. According to the result of the analysis and statistical calculation it is found that rxy is 0.604, which means there is significant correlation between students’ activity in playing English video games and students’ vocabulary mastery.
The use of peer feedback via Instagram in Blended learning to improve students' Recount text writing
Authors:   Universitas Lampung, Ramadhanty Putri , Sutarsyah Cucu ,   Universitas Lampung, Nurweni Ari ,   Universitas Lampung
Published: May 2022

Writing is one of language skills which is considered as a complicated skill to be mastered because it requires variety of abilities such as generating ideas, determining purposes, developing arguments, organizing and managing the text effectively, and revising draft. Due to that matter, this research proposed instagram as one of the effective tools used in blended learning to improve student’s writing. The aims of this study are to investigate whether there is any difference in student’s writing achievement after the students are taught by using Peer feedback via instagram , to find out which aspect of writing that improves the most after being taught by using Peer feedback via instagram and to find out what aspect of writing that students correct the most. This research used the one-group pretest-posttest design that involved 30 students of X IPS 4 class at MAN 1 Bandar Lampung in the 2019/2020 academic year. The writing tests were also used as the instruments to collect the data. The data obtained were analyzed by using paired sample t-test in which the significance level was determined by sign <0.05. With regard to the data analysis, the use of instagram can improve the Student’s writing achievement in all aspects of writing: content, organization, vocabulary, language use and mechanics. It is also found that content was the aspect of writing which improved the most. However, the aspect that the students corrected the most was language use.
Pengaruh Strategi Metakognitif Dan Kemampuan Awal Terhadap Kemampuan Penalaran Matematis Siswa
Authors: Juniawan Egi Adha
Published: May 2022

Penelitian ini bertujuan untuk mengkaji pengaruh strategi metakognitif dan kemampuan awal terhadap kemampuan penalaran matematis siswa. Metode yang digunakan dalam penelitian ini adalah treatment by level 2×2 dengan menerapkan dua perlakuan yaitu: strategi metakognitif pemecahan masalah dan strategi metakognitif mengulang. Jenis penelitian ini kuantitatif dengan eksperimen semu. Populasi penelitian seluruh siswa kelas VII MTs Swasta yang terakreditasi A se-kabupaten Tangerang, dengan jumlah sampel 128 siswa dari beberapa kelas VII MTs Daar El Qolam 1 dan MTs Daar El Qolam 4 di Kabupaten Tangerang. Teknik pengumpulan data dengan menggunakan tes berbentuk uraian. Teknik analisis data menggunakan analisis varians dua jalan dan uji-t. Temuan hasil penelitian adalah kemampuan penalaran matematis siswa yang belajar menggunakan strategi pemecahan masalah lebih tinggi daripada siswa yang belajar menggunakan strategi mengulang, terdapat pengaruh interaksi yang signifikan antara strategi metakognitif dan kemampuan awal terhadap kemampuan penalaran matematis siswa, kelompok siswa yang memiliki kemampuan awal tinggi, kemampuan penalaran matematis siswa yang belajar menggunakan strategi metakognitif mengulang lebih tinggi dari kelompok siswa yang belajar dengan menggunakan strategi metakognitif pemecahan masalah, kelompok siswa yang memiliki kemampuan awal rendah, kemampuan penalaran kelompok siswa yang belajar menggunakan strategi metakognitif pemecahan masalah lebih rendah dari kelompok siswa yang belajar dengan menggunakan strategi metakognitif mengulang. Hasil penelitian ini menunjukkan bahwa strategi metakognitif ini dapat dijadikan sebagai alternatif strategi pembelajaran yang efektif untuk mencapai kemampuan penalaran matematis siswa secara optimal khususnya pada siswa yang memiliki kemampuan awal tinggi.
Discovery Learning Versus Traditional Learning: How Effective Discovery Learning Can Improve Mathematical Creative Thinking Skills
Authors: Mustafa Ade Nandang , Lasmaya Deni
Published: May 2022

The present study aims to understand the effectiveness of discovery learning in increasing mathematical creative skills in comparison to traditional learning methods. This study uses a non-equivalent control group research design. The variables in this study include independent variables, namely Discovery Learning and Traditional Learning, and the dependent variable is the mathematical creative thinking skill, while the control variable is a group of students' initial ability categories (top, middle, and bottom). The research sample consisted of two groups of 39 grade 7 students selected using a random assignment technique from one junior high school in Lembang, Indonesia. The data were obtained through mathematical creative thinking skills tests. Overall, the improvement in mathematical creative thinking skills of students who received Discovery Learning is better than students who received traditional learning. In the top and middle categories, the improvement of mathematical creative thinking skills of students who received Discovery Learning is better than students who received traditional learning. While the groups are in the bottom category, the mathematical creative thinking skills of students who get discovery learning is no better than students who get traditional learning.
Analisis Kemampuan Literasi Matematik dan Kemampuan Pemecahan Masalah Siswa Ditinjau Berdasarkan Gender Melalui Pembelajaran Reciprocal Teaching
Authors: . Kusmayati , Yudiawati Nita , Trisaputri Fatiya , Sari Nenden Mutiara
Published: May 2022

Abstrak
Penelitian ini bertujuan untuk menganalisis kemampuan literasi dan kemampuan pemecahan masalah matematik siswa setalah mendapatkan pembelajaran bila ditinjau berdasarkan gender. Metode penelitian ini menggunakan mix method tipe embedded design. Sampel penelitian ini adalah seluruh siswa kelas X SMAN 1 Plumbon Kabupaten Cirebon, Jawa Barat. Instrumen dalam penelitian ini terdiri dari tes berupa soal uraian kemapuan literasi dan pemecahan masalah matematik, dan non tes berupa observasi dan wawancara kemapuan literasi dan pemecahan masalah siswa. Berdasarkan hasil pengolahan data dapat disimpulkan, diantaranya:(1) kemampuan literasi matematik siswa perempuan lebih baik daripada siswa laki-laki pada pembelajaran yang menggunakan Reciprocal Teaching dan kelas konvensional; (2) Kemampuan pemecahan masalah matematik siswa perempuan lebih baik daripada siswa laki-laki pada kelas Reciprocal Teaching dan kemampuan pemecahan masalah siswa perempuan tidak lebih baik daripada siswa laki-laki pada kelas konvensional.
Kata Kunci: Gender, Kemampuan Literasi Matematik, Kemampuan Pemecahan Masalah dan Reciprocal Teaching
 
Abstract
The purpose of this study was to determine students' mathematical literacy abilities, mathematical problem-solving abilities after learning based on gender and to know the differences in increasing literacy skills and mathematical problem solving after receiving Reciprocal Teaching learning. This research method uses the embedded design mix method type. The sample of this research was all students of class X SMAN 1 Plumbon Cirebon Regency, West Java. The instrument in this study consisted of tests in the form of descriptions of literacy skills and mathematical problem solving, and non-tests in the form of observations and interviews of students' literacy skills and problem solving. Based on the results of data processing it can be concluded, including: (1) female students' mathematical literacy skills are better than male students in learning using reciprocal teaching and conventional classes; (2) The ability of female students to solve mathematical problems is better than that of male students in the reciprocal teaching class and the problem solving abilities of female students are not better than that of male students in the conventional class.
Keywords: Gender, Mathematical Literacy Ability, Problem Solving Ability and Reciprocal Teaching
Kemampuan Pemecahan Masalah Matematis Siswa Melalui Pendekatan STEM Berbasis PBL
Authors: Faoziyah Nina
Published: May 2022

Penelitian ini bertujuan untuk meningkatkan kemampuan pemecahan masalah matematis siswa kelas X-Multimedia 1 SMK Muhammadiyah Kota Tegal melalui penerapan pendekatan STEM berbasis PBL pada materi trigonometri. Dalam Penelitian ini menggunakan penelitian tindakan kelas yang terdiri dari tiga siklus. Subjek penelitian ini adalah siswa kelas X-Multimedia 1 SMK Muhammadiyah Kota Tegal tahun ajaran 2019/2020 yang berjumlah 32 orang. Teknik pengumpulan  data meliputi wawancara, observasi, tes kemampuan pemecahan masalah, dan dokumentasi. Data yang terkumpul kemudian diolah dengan analisis deskriptif. Hasil penelitian tentang penerapan pendekatan STEM berbasis PBL adalah sebagai berikut: persentase ketuntasan kemampuan pemecahan masalah matematis siswa pada siklus kesatu berada pada kriteria tinggi yaitu 81,25%, pada siklus kedua mengalami penurunan dengan kriteria kurang yaitu 46,875% dan pada siklus ketiga mengalami peningkatan dengan kriteria Cukup yaitu 75%.  Hasil  penelitian, menunjukkan bahwa penerapan pendekatan STEM berbasis PBL dapat meningkatkan kemampuan pemecahan masalah matematis siswa kelas X-Multimedia 1 SMK Muhammadiyah Kota Tegal pada tahun ajaran 2019/2020.
Pendekatan Saintifik Dengan Reward Dalam Meningkatkan Pemahaman Dan Persepsi Siswa Terhadap Matematika
Authors: Mariana Anna
Published: May 2022

Pendekatan saintifik dengan reward dalam meningkatkan pemahaman matematika dan persepsi siswa terhadap pembelajaran matematika kelas X SMKN 10 Bandung. Penelitian ini bertujuan untuk mengetahui bahwa melalui pendekatan saintifik dengan reward, pemahaman matematika siswa dapat meningkat, persepsi siswa terhadap pembelajaran matematika lebih positif dan aktivitas di kelas menjadi aktif. Penilitian ini menggunakan metode kuasi eksperimen tipe embeded dengan tiga perlakuan di tiga kelas berbeda. Kelas eksperimen pertama diberi perlakuan pendekatan saintifik dengan reward, kelas eksperimen kedua diberi perlakuan pendekatan saintifik tanpa reward, dan kelas kontrol yang diberi perlakuan pembelajaran langsung. Hasil penelitian menunjukan bahwa terdapat peningkatan pemahaman matematika  antara kelas saintifik dengan reward, kelas saintafik tanpa reward dan kelas kontrol, terdapat perbedaan pemahaman antara kelas saintifik dengan reward dan kelas saintifik tanpa reward, begitu juga ada perbedaan pemahaman antara kelas saintifik tanpa reward dan kelas kontrol. Hasil penelitian juga memperlihatkan adanya perbedaan persepsi siswa dalam pembelajaran matematika antara kelas saintifik dengan reward, kelas saintifik tanpa reward dan kelas kontrol. Persepsi siswa lebih positif dan aktivitas di kelas lebih aktif pada kelas saintifik dengan reward dibandingkan dengan kelas saintifik tanpa reward dan kelas kontrol.
Motivasi Belajar Siswa Melalui Model Pembelajaran Numbered Heads Together (NHT)
Authors: Firmansyah Eka , Solihah Siti
Published: May 2022

Penelitian ini bertujuan untuk meninjau motivasi belajar siswa melalui model pembelajaran Numbered Heads Together (NHT). Metode penelitian yang akan digunakan dalam penelitian ini adalah Metode Campuran (Mixed Method) tipe penyisipan (Embedded Design). Desain yang digunakan adalah desain eksperimen semu (Quasi Experiment) yaitu rancangan kelompok-kontrol (pretest dan posttest). Sampel penelitiannya adalah 2 kelas, yaitu siswa kelas X RPL 2 yang terdiri dari 24 siswa sebagai kelas eksperimen dan kelas X RPL 1 sebagai kelas kontrol yang terdiri dari 24 siswa. Teknik pengumpulan data yang digunakan dalam penelitian ini diantaranya: angket motivasi belajar matematika siswa, wawancara, observasi. Angket skala motivasi belajar matematika diberikan kepada siswa sesudah pembelajaran, angket ini terdiri dari 30 pernyataan yang dilengkapi dengan lima pilihan jawaban. Hasil penelitian dapat disimpulkan bahwa motivasi belajar matematika siswa yang mendapatkan pembelajaran dengan model pembelajaran Numbered Heads Together (NHT) meningkat, karena adanya peran serta guru dalam memfasilitasi dan mengakomodasi proses belajar mengajar dengan cara membuat kegiatan yang menarik sehingga membuat siswa lebih termotivasi.
Surgery in the Area of Accessory Infraorbital Foramen and Nerve: Cone-Beam Computed Tomography versus Intraoperative Appearance
Authors: Kuchynskyi Artur , Fesenko Ievgen
Published: May 2022

We present a unique comparison of cone-beam computed tomography (CBCT) and intraoperative view of the accessory infraorbital foramen and nerve in a 60-year-old woman who was surgically treated due to the giant dentigerous cyst of the maxillary sinus from ectopic upper third molar. CBCT imaging demonstrates highest level of accuracy in verification of the accessory infraorbital foramina what makes this imaging technique a perfect tool for the surgery planning in the area of middle face. Avoidance of iatrogenic trauma of both infraorbital and accessory nerves will be ensured significantly in professionals who understand this topic. Oral and maxillofacial surgeons and doctors of neighboring specialties should be aware of such unusual anatomic variation as unilateral or even bilateral accessory infraorbital foramina and intraosseous nerve ramification.
Penerapan Codeigniter Dalam Pengembangan Sistem Pembelajaran Dalam Jaringan Di SMK 7 Bandar Lampung
Authors: Setiawansyah Setiawansyah , Sulistiani Heni , Saputra Very Hendra
Published: May 2022

Teknologi informasi merupakan bagian dari sistem informasi yang mendukung sistem informasi dalam menghasilkan berbagai informasi yang dibutuhkan oleh suatu perusahaan untuk mencapai tujuan tertentu. Perkembangan teknologi informasi di Indonesia telah banyak mengalami kemajuan, didukung dengan teknologi komunikasi yang menunjukkan peningkatan yang sangat signifikan merupakan alternatif yang tepat bagi suatu bidang pendidikan untuk menunjang kinerja dari penyelenggaraan pendidikan tersebut agar dapat berjalan dan bekerja dengan baik. Penggunaan teknologi berbasis online dan mobile mempunyai peranan yang cukup penting dalam proses pembelajaran dalam jaringan, termasuk di dalamnya adalah pencapaian tujuan pembelajaran jarak jauh pada masa pandemi Covid-19. Pembelajaran DARING pada SMK 7 Bandarlampung menggunakan aplikasi Google Classroom, pengumpulan tugas siswa harus mengirimkan jawaban melalui aplikasi pesan instan WhatApps, serta belum tersedianya tutorial video pengajaran yang dilakukan oleh guru. Pengembangan Sistem Pembelajaran Dalam Jaringan menggunakan CodeIgniter membantu pihak sekolah dalam melakukan pengawasan pembelajaran karena dapat di monitoring secara langsung proses pembelajaran yaitu upload materi, video pengerjaan dan pembelajaran, upload tugas yang dilakukan oleh siswa dan guru, sehingga membantu pihak sekolah dalam pengawasan pembelajaran DARING. Hasil pengujian menggunakan kriteria Model TAM untuk penerimaan teknologi sebesar 85,41% dengan kriteria Sangat Baik untuk model penerimaan teknologi model TAM dalam aplikasi pembelajaran DARING
Unpacking the Effect of Social Media Infodemic on Consumers’ Panic Banking Behaviour during the Covid-19 Pandemic. Evidence from the Banking Sector in Oman
Authors: Masengu Reason , AL Raouyashadi Wael , Makudza Forbes , Muchenje Chenjerai
Published: May 2022

During the Covid-19 pandemic, some government restrictions to curb the spread of corona virus rendered print media obsolete. Social media became a convenient channel of communication. However, social media was awash with false and alarming information about the pandemic and government initiatives. This led to infodemic as consumers accessed misrepresented information on social media. As a result of social media infodemic, some consumers engaged in panic banking through withdrawal rush due to uncertain future expectation. This study aimed to examine the effect of social media infodemic during the Covid-19 pandemic on consumers’ panic intention behaviour in the banking industry. Data for the study was collected from 230 consumers of the baking industry in Oman using a questionnaire. A social media infodemic model was developed using a deductive approach. The study found out that social media infodemic was responsible for panic banking intention behaviour in Oman. The four determinants of social media panic behaviour were all statistically significantly impacting on panic banking behaviour. The study concluded that social media infodemic is a key determinant of panic banking in the banking sector. In light of the above findings, the banking industry should monitor social media so as to dilute misinformation with factual corporate communications so as to minimise panic banking behaviour.
The Role of Vietnam in the Global Coffee Value Chain
Authors: Thăng Nhung Thị Hồng
Published: May 2022

Coffee is one of Vietnam's key agricultural products, with its export volume taking second place in the world. This industry creates many jobs, brings high economic value, creates stable income for employees in Viet Nam, especially develops the local economy, and contributes a significant part to the country's development. The article analyzes the role of Vietnam's coffee industry in the global coffee value chain through a variety of steps: from production, collection, and processing to domestic consumption and export; This paper also draws out the advantages and disadvantages of Vietnam's participation in the world coffee market. It has a very important meaning in affirming the position of Vietnam's coffee industry and helping the Government, businesses, and employees to take reasonable measures to improve product quality as well as the proportion of Vietnamese coffee in the world market.